/* SentenceStudio Blazor Hybrid - Theme & Custom Styles */
/* Bootstrap 5.3 CSS Variables + Custom Extensions */

/* ============================================
   CUSTOM PROPERTIES (no Bootstrap equivalent)
   ============================================ */

:root {
    /* Korean typography */
    --ss-font-family-korean: 'Yeonsung', sans-serif;
    
    /* Global font scale — controlled from Settings, applied via JS */
    --ss-font-scale: 1;
    
    /* On-primary text color — contrasting color for primary backgrounds.
       Default white works for most themes with dark primary colors.
       Themes with light primary colors override below. */
    --ss-on-primary: #fff;
    
    /* Proficiency colors */
    --ss-proficiency-low: #FF8C00;
}

/* Brite theme has a light primary (#a2e436) — needs dark text */
[data-ss-theme="brite"] {
    --ss-on-primary: #000;
}

/* ============================================
   LIGHT THEME BASE (Bootstrap overrides)
   ============================================ */
[data-bs-theme="light"] {
    /* Status colors (shared across all themes) */
    --bs-success: #12B886;
    --bs-success-rgb: 18, 184, 134;
    --bs-warning: #FFC233;
    --bs-warning-rgb: 255, 194, 51;
    --bs-danger: #E13B30;
    --bs-danger-rgb: 225, 59, 48;
}

/* ============================================
   DARK THEME BASE (Bootstrap overrides)
   ============================================ */
[data-bs-theme="dark"] {
    /* Status colors (shared across all themes) */
    --bs-success: #12B886;
    --bs-success-rgb: 18, 184, 134;
    --bs-warning: #FFC233;
    --bs-warning-rgb: 255, 194, 51;
    --bs-danger: #E13B30;
    --bs-danger-rgb: 225, 59, 48;
}

/* ============================================
   THEME: Seoul Pop (Obangsaek-inspired)
   ============================================ */
[data-ss-theme="seoul-pop"][data-bs-theme="light"] {
    --bs-primary: #1E4DFF;
    --bs-primary-rgb: 30, 77, 255;
    --bs-secondary: #12B886;
    --bs-secondary-rgb: 18, 184, 134;
    --bs-info: #1E4DFF;
    --bs-info-rgb: 30, 77, 255;
    
    --bs-body-bg: #F7F8FF;
    --bs-body-bg-rgb: 247, 248, 255;
    --bs-body-color: #0B0D12;
    --bs-body-color-rgb: 11, 13, 18;
    
    --bs-secondary-bg: #FFFFFF;
    --bs-secondary-bg-rgb: 255, 255, 255;
    --bs-tertiary-bg: #EEF1FF;
    --bs-tertiary-bg-rgb: 238, 241, 255;
    
    --bs-secondary-color: #394150;
    --bs-secondary-color-rgb: 57, 65, 80;
    --bs-tertiary-color: #7A8699;
    --bs-tertiary-color-rgb: 122, 134, 153;
    
    --bs-border-color: #D6DAF0;
    --bs-border-color-rgb: 214, 218, 240;
    
    --ss-on-primary: #FFFFFF;
    --ss-accent: #FF6A3D;
    --ss-on-accent: #FFFFFF;
    --ss-surface-elevated: #FCFDFF;
}

[data-ss-theme="seoul-pop"][data-bs-theme="dark"] {
    --bs-primary: #6B8CFF;
    --bs-primary-rgb: 107, 140, 255;
    --bs-secondary: #21D6A4;
    --bs-secondary-rgb: 33, 214, 164;
    --bs-info: #6B8CFF;
    --bs-info-rgb: 107, 140, 255;
    
    --bs-body-bg: #060913;
    --bs-body-bg-rgb: 6, 9, 19;
    --bs-body-color: #F8FAFF;
    --bs-body-color-rgb: 248, 250, 255;
    
    --bs-secondary-bg: #0C1222;
    --bs-secondary-bg-rgb: 12, 18, 34;
    --bs-tertiary-bg: #121B33;
    --bs-tertiary-bg-rgb: 18, 27, 51;
    
    --bs-secondary-color: #C6D0E7;
    --bs-secondary-color-rgb: 198, 208, 231;
    --bs-tertiary-color: #93A3C7;
    --bs-tertiary-color-rgb: 147, 163, 199;
    
    --bs-border-color: #263457;
    --bs-border-color-rgb: 38, 52, 87;
    
    --ss-on-primary: #081022;
    --ss-accent: #FF7A4D;
    --ss-on-accent: #0B0D12;
    --ss-surface-elevated: #1A2545;
}

/* ============================================
   THEME: Ocean (Teal/Cyan)
   ============================================ */
[data-ss-theme="ocean"][data-bs-theme="light"] {
    --bs-primary: #0891B2;
    --bs-primary-rgb: 8, 145, 178;
    --bs-secondary: #06B6D4;
    --bs-secondary-rgb: 6, 182, 212;
    --bs-info: #0891B2;
    --bs-info-rgb: 8, 145, 178;
    
    --bs-body-bg: #F0FDFA;
    --bs-body-bg-rgb: 240, 253, 250;
    --bs-body-color: #0F172A;
    --bs-body-color-rgb: 15, 23, 42;
    
    --bs-secondary-bg: #FFFFFF;
    --bs-secondary-bg-rgb: 255, 255, 255;
    --bs-tertiary-bg: #E0F2FE;
    --bs-tertiary-bg-rgb: 224, 242, 254;
    
    --bs-secondary-color: #475569;
    --bs-secondary-color-rgb: 71, 85, 105;
    --bs-tertiary-color: #94A3B8;
    --bs-tertiary-color-rgb: 148, 163, 184;
    
    --bs-border-color: #BAE6FD;
    --bs-border-color-rgb: 186, 230, 253;
    
    --ss-on-primary: #FFFFFF;
    --ss-accent: #14B8A6;
    --ss-on-accent: #FFFFFF;
    --ss-surface-elevated: #FCFEFF;
}

[data-ss-theme="ocean"][data-bs-theme="dark"] {
    --bs-primary: #22D3EE;
    --bs-primary-rgb: 34, 211, 238;
    --bs-secondary: #2DD4BF;
    --bs-secondary-rgb: 45, 212, 191;
    --bs-info: #22D3EE;
    --bs-info-rgb: 34, 211, 238;
    
    --bs-body-bg: #0C1821;
    --bs-body-bg-rgb: 12, 24, 33;
    --bs-body-color: #F0F9FF;
    --bs-body-color-rgb: 240, 249, 255;
    
    --bs-secondary-bg: #164E63;
    --bs-secondary-bg-rgb: 22, 78, 99;
    --bs-tertiary-bg: #155E75;
    --bs-tertiary-bg-rgb: 21, 94, 117;
    
    --bs-secondary-color: #BAE6FD;
    --bs-secondary-color-rgb: 186, 230, 253;
    --bs-tertiary-color: #7DD3FC;
    --bs-tertiary-color-rgb: 125, 211, 252;
    
    --bs-border-color: #0E7490;
    --bs-border-color-rgb: 14, 116, 144;
    
    --ss-on-primary: #082F49;
    --ss-accent: #5EEAD4;
    --ss-on-accent: #0F172A;
    --ss-surface-elevated: #1E3A4A;
}

/* ============================================
   THEME: Forest (Emerald/Green)
   ============================================ */
[data-ss-theme="forest"][data-bs-theme="light"] {
    --bs-primary: #059669;
    --bs-primary-rgb: 5, 150, 105;
    --bs-secondary: #F59E0B;
    --bs-secondary-rgb: 245, 158, 11;
    --bs-info: #059669;
    --bs-info-rgb: 5, 150, 105;
    
    --bs-body-bg: #F0FDF4;
    --bs-body-bg-rgb: 240, 253, 244;
    --bs-body-color: #1C2B1F;
    --bs-body-color-rgb: 28, 43, 31;
    
    --bs-secondary-bg: #FFFFFF;
    --bs-secondary-bg-rgb: 255, 255, 255;
    --bs-tertiary-bg: #DCFCE7;
    --bs-tertiary-bg-rgb: 220, 252, 231;
    
    --bs-secondary-color: #4B5563;
    --bs-secondary-color-rgb: 75, 85, 99;
    --bs-tertiary-color: #9CA3AF;
    --bs-tertiary-color-rgb: 156, 163, 175;
    
    --bs-border-color: #BBF7D0;
    --bs-border-color-rgb: 187, 247, 208;
    
    --ss-on-primary: #FFFFFF;
    --ss-accent: #FBBF24;
    --ss-on-accent: #1F2937;
    --ss-surface-elevated: #FDFFFE;
}

[data-ss-theme="forest"][data-bs-theme="dark"] {
    --bs-primary: #34D399;
    --bs-primary-rgb: 52, 211, 153;
    --bs-secondary: #FBBF24;
    --bs-secondary-rgb: 251, 191, 36;
    --bs-info: #34D399;
    --bs-info-rgb: 52, 211, 153;
    
    --bs-body-bg: #0F1C13;
    --bs-body-bg-rgb: 15, 28, 19;
    --bs-body-color: #F0FDF4;
    --bs-body-color-rgb: 240, 253, 244;
    
    --bs-secondary-bg: #14532D;
    --bs-secondary-bg-rgb: 20, 83, 45;
    --bs-tertiary-bg: #166534;
    --bs-tertiary-bg-rgb: 22, 101, 52;
    
    --bs-secondary-color: #BBF7D0;
    --bs-secondary-color-rgb: 187, 247, 208;
    --bs-tertiary-color: #86EFAC;
    --bs-tertiary-color-rgb: 134, 239, 172;
    
    --bs-border-color: #15803D;
    --bs-border-color-rgb: 21, 128, 61;
    
    --ss-on-primary: #052E16;
    --ss-accent: #FDE047;
    --ss-on-accent: #1F2937;
    --ss-surface-elevated: #1E3D29;
}

/* ============================================
   THEME: Sunset (Amber/Orange)
   ============================================ */
[data-ss-theme="sunset"][data-bs-theme="light"] {
    --bs-primary: #EA580C;
    --bs-primary-rgb: 234, 88, 12;
    --bs-secondary: #DB2777;
    --bs-secondary-rgb: 219, 39, 119;
    --bs-info: #EA580C;
    --bs-info-rgb: 234, 88, 12;
    
    --bs-body-bg: #FFF7ED;
    --bs-body-bg-rgb: 255, 247, 237;
    --bs-body-color: #1C1917;
    --bs-body-color-rgb: 28, 25, 23;
    
    --bs-secondary-bg: #FFFFFF;
    --bs-secondary-bg-rgb: 255, 255, 255;
    --bs-tertiary-bg: #FFEDD5;
    --bs-tertiary-bg-rgb: 255, 237, 213;
    
    --bs-secondary-color: #57534E;
    --bs-secondary-color-rgb: 87, 83, 78;
    --bs-tertiary-color: #A8A29E;
    --bs-tertiary-color-rgb: 168, 162, 158;
    
    --bs-border-color: #FED7AA;
    --bs-border-color-rgb: 254, 215, 170;
    
    --ss-on-primary: #FFFFFF;
    --ss-accent: #F472B6;
    --ss-on-accent: #FFFFFF;
    --ss-surface-elevated: #FFFBFA;
}

[data-ss-theme="sunset"][data-bs-theme="dark"] {
    --bs-primary: #FB923C;
    --bs-primary-rgb: 251, 146, 60;
    --bs-secondary: #F472B6;
    --bs-secondary-rgb: 244, 114, 182;
    --bs-info: #FB923C;
    --bs-info-rgb: 251, 146, 60;
    
    --bs-body-bg: #1C1310;
    --bs-body-bg-rgb: 28, 19, 16;
    --bs-body-color: #FFF7ED;
    --bs-body-color-rgb: 255, 247, 237;
    
    --bs-secondary-bg: #431407;
    --bs-secondary-bg-rgb: 67, 20, 7;
    --bs-tertiary-bg: #7C2D12;
    --bs-tertiary-bg-rgb: 124, 45, 18;
    
    --bs-secondary-color: #FED7AA;
    --bs-secondary-color-rgb: 254, 215, 170;
    --bs-tertiary-color: #FDBA74;
    --bs-tertiary-color-rgb: 253, 186, 116;
    
    --bs-border-color: #C2410C;
    --bs-border-color-rgb: 194, 65, 12;
    
    --ss-on-primary: #431407;
    --ss-accent: #FBA7D8;
    --ss-on-accent: #1F2937;
    --ss-surface-elevated: #52251A;
}

/* ============================================
   THEME: Monochrome (Grayscale)
   ============================================ */
[data-ss-theme="monochrome"][data-bs-theme="light"] {
    --bs-primary: #374151;
    --bs-primary-rgb: 55, 65, 81;
    --bs-secondary: #6B7280;
    --bs-secondary-rgb: 107, 114, 128;
    --bs-info: #374151;
    --bs-info-rgb: 55, 65, 81;
    
    --bs-body-bg: #FFFFFF;
    --bs-body-bg-rgb: 255, 255, 255;
    --bs-body-color: #111827;
    --bs-body-color-rgb: 17, 24, 39;
    
    --bs-secondary-bg: #F9FAFB;
    --bs-secondary-bg-rgb: 249, 250, 251;
    --bs-tertiary-bg: #F3F4F6;
    --bs-tertiary-bg-rgb: 243, 244, 246;
    
    --bs-secondary-color: #4B5563;
    --bs-secondary-color-rgb: 75, 85, 99;
    --bs-tertiary-color: #9CA3AF;
    --bs-tertiary-color-rgb: 156, 163, 175;
    
    --bs-border-color: #E5E7EB;
    --bs-border-color-rgb: 229, 231, 235;
    
    --ss-on-primary: #FFFFFF;
    --ss-accent: #1F2937;
    --ss-on-accent: #FFFFFF;
    --ss-surface-elevated: #FEFEFE;
}

[data-ss-theme="monochrome"][data-bs-theme="dark"] {
    --bs-primary: #D1D5DB;
    --bs-primary-rgb: 209, 213, 219;
    --bs-secondary: #9CA3AF;
    --bs-secondary-rgb: 156, 163, 175;
    --bs-info: #D1D5DB;
    --bs-info-rgb: 209, 213, 219;
    
    --bs-body-bg: #0A0A0A;
    --bs-body-bg-rgb: 10, 10, 10;
    --bs-body-color: #F9FAFB;
    --bs-body-color-rgb: 249, 250, 251;
    
    --bs-secondary-bg: #1F2937;
    --bs-secondary-bg-rgb: 31, 41, 55;
    --bs-tertiary-bg: #374151;
    --bs-tertiary-bg-rgb: 55, 65, 81;
    
    --bs-secondary-color: #D1D5DB;
    --bs-secondary-color-rgb: 209, 213, 219;
    --bs-tertiary-color: #9CA3AF;
    --bs-tertiary-color-rgb: 156, 163, 175;
    
    --bs-border-color: #4B5563;
    --bs-border-color-rgb: 75, 85, 99;
    
    --ss-on-primary: #111827;
    --ss-accent: #F3F4F6;
    --ss-on-accent: #111827;
    --ss-surface-elevated: #2D3748;
}

/* ============================================
   BASE STYLES
   ============================================ */
html, body {
    font-family: var(--bs-font-sans-serif);
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    margin: 0;
    padding: 0;
    height: 100%;
}

#app {
    height: 100%;
    background-color: var(--bs-body-bg);
}

main.main-content {
    background-color: var(--bs-body-bg);
}

/* Page header — sticky on all screen sizes */
.page-header {
    position: sticky;
    top: -1rem; /* pull up into main's 1rem (p-3=16px≈1rem) top padding */
    z-index: 1030;
    background: var(--bs-body-bg);
    margin-left: -1rem;
    margin-right: -1rem;
    padding: 1rem 1rem 0.5rem; /* restore alignment inside */
    margin-bottom: 0.5rem;
}

/* Remove Blazor's focus-on-navigate outline from content area */
main:focus,
h1:focus,
h2:focus,
h3:focus,
[tabindex]:focus {
    outline: none !important;
    box-shadow: none !important;
}

/* ============================================
   TYPOGRAPHY (matching ApplicationTheme.Styles.cs)
   ============================================ */
.ss-display {
    font-size: calc(60px * var(--ss-font-scale, 1));
    line-height: 1.17;
    font-weight: 700;
    color: var(--bs-body-color);
}

.ss-large-title {
    font-size: calc(34px * var(--ss-font-scale, 1));
    line-height: 1.21;
    font-weight: 700;
    color: var(--bs-body-color);
}

.ss-title1 {
    font-size: calc(28px * var(--ss-font-scale, 1));
    line-height: 1.21;
    color: var(--bs-body-color);
}

.ss-title2 {
    font-size: calc(22px * var(--ss-font-scale, 1));
    line-height: 1.27;
    font-weight: 600;
    color: var(--bs-body-color);
}

.ss-title3 {
    font-size: calc(20px * var(--ss-font-scale, 1));
    line-height: 1.25;
    font-weight: 600;
    color: var(--bs-body-color);
}

.ss-headline {
    font-size: calc(32px * var(--ss-font-scale, 1));
    text-align: center;
    color: var(--bs-body-color);
}

.ss-subheadline {
    font-size: calc(24px * var(--ss-font-scale, 1));
    text-align: center;
    color: var(--bs-body-color);
}

.ss-body1 {
    font-size: calc(17px * var(--ss-font-scale, 1));
    line-height: 1.29;
    color: var(--bs-body-color);
}

.ss-body1-strong {
    font-size: calc(17px * var(--ss-font-scale, 1));
    line-height: 1.29;
    font-weight: 600;
    color: var(--bs-body-color);
}

.ss-body2 {
    font-size: calc(15px * var(--ss-font-scale, 1));
    line-height: 1.33;
    color: var(--bs-body-color);
}

.ss-body2-strong {
    font-size: calc(15px * var(--ss-font-scale, 1));
    line-height: 1.33;
    font-weight: 600;
    color: var(--bs-body-color);
}

.ss-caption1 {
    font-size: calc(13px * var(--ss-font-scale, 1));
    line-height: 1.38;
    color: var(--bs-secondary-color);
}

.ss-caption1-strong {
    font-size: calc(13px * var(--ss-font-scale, 1));
    line-height: 1.38;
    font-weight: 600;
    color: var(--bs-secondary-color);
}

.ss-caption2 {
    font-size: calc(12px * var(--ss-font-scale, 1));
    line-height: 1.33;
    color: var(--bs-tertiary-color);
}

/* ============================================
   CARD STYLES
   ============================================ */
.card-ss {
    background-color: var(--bs-tertiary-bg);
    border: none;
    border-radius: var(--bs-border-radius-xl);
    padding: var(--bs-card-spacer-y);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card-ss.clickable,
.card-ss[role="button"] {
    cursor: pointer;
}

.card-ss.clickable:hover,
.card-ss[role="button"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.card-ss.clickable:active,
.card-ss[role="button"]:active {
    transform: translateY(0);
    box-shadow: none;
}

.card-ss-elevated {
    background-color: var(--ss-surface-elevated);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius-xl);
    padding: var(--bs-card-spacer-y);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

/* ============================================
   BUTTON STYLES (matching theme)
   ============================================ */

/* Global font-scale for all buttons and form controls */
.btn {
    font-size: calc(14px * var(--ss-font-scale, 1));
}
.form-control, .form-select {
    font-size: calc(14px * var(--ss-font-scale, 1));
}

.btn-ss-primary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: var(--ss-on-primary, #fff);
    font-size: calc(14px * var(--ss-font-scale, 1));
    border-radius: var(--bs-border-radius);
    padding: 10px 14px;
    min-height: 44px;
    min-width: 44px;
}

.btn-ss-primary:hover,
.btn-ss-primary:focus,
.btn-ss-primary:active {
    background-color: var(--bs-primary) !important;
    border-color: var(--bs-primary) !important;
    color: var(--ss-on-primary, #fff) !important;
    filter: brightness(1.1);
}

.btn-group .btn-ss-primary,
.btn-group .btn-ss-primary:hover,
.btn-group .btn-ss-primary:focus {
    color: var(--ss-on-primary, #fff) !important;
    background-color: var(--bs-primary) !important;
    border-color: var(--bs-primary) !important;
}
.btn-group .btn-ss-primary:hover {
    filter: brightness(1.1);
}

.btn-ss-secondary {
    background-color: var(--bs-tertiary-bg);
    border-color: var(--bs-border-color);
    color: var(--bs-body-color);
    font-size: calc(14px * var(--ss-font-scale, 1));
    border-radius: var(--bs-border-radius);
    padding: 10px 14px;
    min-height: 44px;
    min-width: 44px;
}

.btn-ss-secondary:hover,
.btn-ss-secondary:focus,
.btn-ss-secondary:active {
    background-color: var(--ss-surface-elevated) !important;
    border-color: var(--bs-border-color) !important;
    color: var(--bs-body-color) !important;
}

.btn-ss-accent {
    background-color: var(--ss-accent);
    border-color: var(--ss-accent);
    color: var(--ss-on-accent);
    font-size: calc(14px * var(--ss-font-scale, 1));
    border-radius: var(--bs-border-radius);
    padding: 10px 14px;
    min-height: 44px;
    min-width: 44px;
}

.btn-ss-accent:hover,
.btn-ss-accent:focus,
.btn-ss-accent:active {
    background-color: var(--ss-accent) !important;
    border-color: var(--ss-accent) !important;
    color: var(--ss-on-accent) !important;
    filter: brightness(1.1);
}

.btn-ss-danger {
    background-color: var(--bs-danger);
    border-color: var(--bs-danger);
    color: white;
    font-size: calc(14px * var(--ss-font-scale, 1));
    border-radius: var(--bs-border-radius);
    padding: 10px 14px;
    min-height: 44px;
    min-width: 44px;
}

.btn-ss-danger:hover,
.btn-ss-danger:focus,
.btn-ss-danger:active {
    background-color: var(--bs-danger) !important;
    border-color: var(--bs-danger) !important;
    color: white !important;
    filter: brightness(1.1);
}

/* ============================================
   BOOTSTRAP DARK-MODE OVERRIDES
   (btn-outline-* text contrast fix)
   ============================================ */
.btn-outline-secondary {
    color: var(--bs-secondary-color);
    border-color: var(--bs-border-color);
}

.btn-outline-secondary:hover {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: var(--ss-on-primary, #fff);
}

.btn-check:checked + .btn-outline-secondary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
    color: var(--ss-on-primary, #fff);
}

/* Vertically center text in btn-group radio toggles */
.btn-group > .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Suppress browser-reapplied :hover/:active/:focus on quiz buttons after auto-advance.
   Button visual state is managed by Blazor (bgClass/borderStyle), so CSS pseudo-class
   highlights are redundant and cause ghost highlights when DOM gets replaced.
   Must use the same variables as the Seoul Pop theme's .btn-outline-secondary base rule
   (--bs-secondary-color for text, --bs-border-color for border), NOT Bootstrap's
   default --bs-btn-color/#6c757d which produces visible mismatch. */
.btn.btn-outline-secondary.quiz-choice-btn {
    -webkit-tap-highlight-color: transparent !important;
    -webkit-touch-callout: none;
}

.btn.btn-outline-secondary.quiz-choice-btn:hover,
.btn.btn-outline-secondary.quiz-choice-btn:active,
.btn.btn-outline-secondary.quiz-choice-btn:focus,
.btn.btn-outline-secondary.quiz-choice-btn:focus-visible,
.btn.btn-outline-secondary.quiz-choice-btn.active {
    background-color: transparent !important;
    border-color: var(--bs-border-color) !important;
    color: var(--bs-secondary-color) !important;
    box-shadow: none !important;
    outline: none !important;
}

[data-bs-theme="dark"] .btn-outline-danger {
    color: var(--bs-danger);
    border-color: var(--bs-danger);
}

[data-bs-theme="dark"] .btn-outline-success {
    color: var(--bs-success);
    border-color: var(--bs-success);
}

/* ============================================
   FORM INPUT STYLES
   ============================================ */
.form-control-ss {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    color: var(--bs-body-color);
    border-radius: var(--bs-border-radius);
    min-height: 44px;
    font-size: calc(14px * var(--ss-font-scale, 1));
}

.form-control-ss:focus {
    background-color: var(--bs-body-bg);
    border-color: var(--bs-primary);
    color: var(--bs-body-color);
    box-shadow: 0 0 0 0.2rem rgba(107, 140, 255, 0.25);
}

.form-control-ss::placeholder {
    color: var(--bs-tertiary-color);
}

/* ============================================
   BADGE STYLES
   ============================================ */
.badge-ss {
    background-color: var(--bs-secondary-bg);
    color: var(--bs-body-color);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius-sm);
    font-size: calc(13px * var(--ss-font-scale, 1));
    padding: 4px 8px;
}

.badge-ss-success {
    background-color: var(--bs-success);
    color: white;
}

.badge-ss-warning {
    background-color: var(--bs-warning);
    color: var(--bs-gray-900);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-primary-ss { color: var(--bs-body-color) !important; }
.text-secondary-ss { color: var(--bs-secondary-color) !important; }
.text-muted-ss { color: var(--bs-tertiary-color) !important; }
.text-success-ss { color: var(--bs-success) !important; }
.text-warning-ss { color: var(--bs-warning) !important; }
.text-error-ss { color: var(--bs-danger) !important; }
.text-accent-ss { color: var(--ss-accent) !important; }

.bg-surface { background-color: var(--bs-secondary-bg) !important; }
.bg-surface-variant { background-color: var(--bs-tertiary-bg) !important; }
.bg-surface-elevated { background-color: var(--ss-surface-elevated) !important; }

/* ============================================
   MOBILE-RESPONSIVE OVERRIDES
   ============================================ */
@media (max-width: 768px) {
    :root {
        --ss-layout-padding: 12px;
        --ss-layout-spacing: 12px;
        --ss-section-spacing: 20px;
        --ss-card-padding: 8px;
        --ss-card-margin: 8px;
        --ss-grid-spacing: 8px;
    }

    .ss-display { font-size: calc(42px * var(--ss-font-scale, 1)); }
    .ss-large-title { font-size: calc(28px * var(--ss-font-scale, 1)); }
    .ss-title1 { font-size: calc(24px * var(--ss-font-scale, 1)); }
    .ss-headline { font-size: calc(26px * var(--ss-font-scale, 1)); }
    .ss-subheadline { font-size: calc(20px * var(--ss-font-scale, 1)); }
}

/* Safe area for mobile status bars */
.status-bar-safe-area {
    display: none;
}

@supports (padding-top: env(safe-area-inset-top)) {
    .status-bar-safe-area {
        display: block;
        height: env(safe-area-inset-top);
    }
}


/* ============================================
   NAVIGATION STYLES
   ============================================ */
.sidebar-nav {
    width: 260px;
    background-color: var(--bs-secondary-bg) !important;
    transition: width 0.2s ease;
    overflow: hidden;
}

.sidebar-nav.collapsed {
    width: 64px;
}

/* Nav links: icon + label layout */
.sidebar-nav .nav-link-ss {
    white-space: nowrap;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-nav .nav-link-ss i {
    flex-shrink: 0;
    width: 1.25em;
    text-align: center;
    font-size: 1.1rem;
}

.sidebar-nav .nav-link-ss .nav-label {
    transition: opacity 0.15s ease, width 0.2s ease;
    overflow: hidden;
}

/* Collapsed: hide labels, center icons */
.sidebar-nav.collapsed .nav-link-ss {
    justify-content: center;
    padding-left: 0 !important;
    padding-right: 0 !important;
}

.sidebar-nav.collapsed .nav-link-ss .nav-label {
    opacity: 0;
    width: 0;
    position: absolute;
}

.sidebar-nav.collapsed .nav > hr {
    margin-left: 0.5rem;
    margin-right: 0.5rem;
}

/* Collapsed: tooltip on hover */
.sidebar-nav.collapsed .nav-link-ss {
    position: relative;
    overflow: visible;
}

.sidebar-nav.collapsed .nav-link-ss:hover::after {
    content: attr(title);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 8px;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    padding: 4px 10px;
    font-size: calc(13px * var(--ss-font-scale, 1));
    white-space: nowrap;
    z-index: 1050;
    pointer-events: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav-link-ss {
    color: var(--bs-secondary-color) !important;
    font-size: calc(15px * var(--ss-font-scale, 1));
    transition: background-color 0.15s, color 0.15s;
}

.nav-link-ss:hover {
    background-color: var(--bs-tertiary-bg) !important;
    color: var(--bs-body-color) !important;
}

.nav-link-ss.active {
    background-color: var(--bs-tertiary-bg) !important;
    color: var(--bs-primary) !important;
    font-weight: 600;
}

/* ============================================
   TOAST NOTIFICATION STYLES
   ============================================ */
.toast-container-ss {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    z-index: 1090;
}

.toast-ss {
    background-color: var(--ss-surface-elevated);
    color: var(--bs-body-color);
    border: none;
    border-radius: var(--bs-border-radius);
}

/* ============================================
   MODAL OVERRIDES
   ============================================ */
.modal-content-ss {
    background-color: var(--bs-secondary-bg);
    border: 1px solid var(--bs-border-color);
    color: var(--bs-body-color);
}

.offcanvas-ss {
    background-color: var(--bs-secondary-bg) !important;
    color: var(--bs-body-color) !important;
}

/* Vocabulary filter offcanvas — bottom sheet with safe area padding */
#vocabFilterPanel .offcanvas-body {
    padding-bottom: calc(1rem + var(--safe-area-bottom, 0px));
}

/* ============================================
   MOBILE / RESPONSIVE
   ============================================ */

/* iOS safe area insets */
:root {
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

/* Page header */
.page-header {
    min-height: 44px;
    margin-bottom: 1rem;
}
.page-header-inner {
    min-height: 44px;
}

/* Icon-only buttons (touch-friendly 44px targets) */
.btn-icon {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--bs-border-radius);
    background: transparent;
    border: none;
}
.btn-icon:hover, .btn-icon:focus {
    background: var(--bs-tertiary-bg);
}

/* Mobile: < 768px */
@media (max-width: 767.98px) {
    /* Mobile main: horizontal padding for all content, no top padding (header handles it) */
    main.main-content {
        padding: 0 0.75rem 0.75rem 0.75rem !important;
        overflow-x: hidden !important;
        overscroll-behavior-y: none; /* prevent rubber-band bounce that reveals gap above header */
    }

    /* Offcanvas flyout: 90% width, not full screen */
    .offcanvas {
        --bs-offcanvas-width: 90%;
    }

    /* Mobile page header — breaks out of main padding for edge-to-edge background */
    .page-header {
        position: sticky;
        top: 0;
        z-index: 1030;
        background: var(--bs-secondary-bg);
        border-bottom: 1px solid var(--bs-border-color);
        margin: 0 -0.75rem;
        padding: 0 0.75rem;
        padding-top: env(safe-area-inset-top, 0px);
        margin-bottom: 0.75rem;
        min-height: calc(44px + env(safe-area-inset-top, 0px));
    }
    .page-header .page-header-inner {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    .page-header h1 {
        font-size: 1.125rem;
        font-weight: 600;
    }

    /* Touch-friendly form controls */
    .form-control, .form-select {
        min-height: 44px;
        font-size: calc(16px * var(--ss-font-scale, 1)); /* prevents iOS zoom on focus */
    }

    /* Touch-friendly buttons */
    .btn {
        min-height: 44px;
        padding-left: 16px;
        padding-right: 16px;
    }
    .btn-sm {
        min-height: 36px;
    }

    /* Cloze sentence font size — prevent Korean text wrapping */
    .ss-display {
        font-size: 1.5rem;
    }

    /* Cards: reduce padding on mobile */
    .card-ss {
        padding: 0.5rem;
    }

    /* Dropdown menus: larger touch targets */
    .dropdown-menu .dropdown-item {
        padding: 10px 16px;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* Hide desktop-only button labels on mobile */
    .page-header .btn .btn-label-text {
        display: none;
    }
}

/* ── Tom Select theme overrides ── */
.ts-wrapper .ts-control,
.ts-wrapper .ts-control input {
    color: var(--bs-body-color);
}

.ts-wrapper .ts-control {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    min-height: 44px;
}

.ts-wrapper .ts-dropdown {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    color: var(--bs-body-color);
}

.ts-wrapper .ts-dropdown .active {
    background-color: var(--bs-primary);
    color: var(--ss-on-primary, #fff);
}

.ts-wrapper .ts-dropdown .option {
    color: var(--bs-body-color);
}

.ts-wrapper .ts-control::placeholder,
.ts-wrapper .ts-control input::placeholder {
    color: var(--bs-tertiary-color);
}

.ts-wrapper.focus .ts-control {
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 0.2rem rgba(107, 140, 255, 0.25);
}

.ts-wrapper .ts-control .item {
    background-color: var(--bs-primary) !important;
    color: var(--ss-on-primary, #fff) !important;
    border: none !important;
    border-radius: var(--bs-border-radius-sm);
}

/* Single select: selected value text uses primary color */
.ts-wrapper.single .ts-control .item {
    background-color: transparent !important;
    color: var(--bs-primary) !important;
    font-weight: 500;
}

/* ============================================
   THEME SWATCH PICKER (Settings page)
   ============================================ */
.theme-swatch {
    border: 2px solid transparent;
    border-radius: var(--bs-border-radius);
    padding: 8px;
    background-color: var(--bs-tertiary-bg);
    cursor: pointer;
    transition: all 0.2s;
    flex: 1 1 calc(50% - 8px);
    min-width: 140px;
}

.theme-swatch:hover {
    border-color: var(--bs-border-color);
}

.theme-swatch.selected {
    border-color: var(--bs-primary);
    background-color: var(--bs-secondary-bg);
}

.theme-swatch-colors {
    display: flex;
    gap: 4px;
    margin-bottom: 6px;
    border-radius: 4px;
    overflow: hidden;
    height: 40px;
}

.theme-swatch-colors .color-primary,
.theme-swatch-colors .color-accent {
    flex: 1;
}

.theme-swatch-label {
    text-align: center;
    font-size: calc(13px * var(--ss-font-scale, 1));
    color: var(--bs-body-color);
    font-weight: 500;
}

/* ============================================
   HOVER STATES: Interactive & Clickable Elements
   ============================================ */

/* ── Interactive text: reading page ── */
.interactive-text {
    line-height: 2;
    word-spacing: 0.05em;
}

.interactive-text .word {
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease;
    border-radius: 3px;
    padding: 1px 2px;
    margin: 0 1px;
}

.interactive-text .word:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.15);
}

.interactive-text .word--vocab {
    color: var(--bs-primary);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: rgba(var(--bs-primary-rgb), 0.4);
    text-underline-offset: 3px;
}

.interactive-text .word--vocab:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.2);
    text-decoration-color: var(--bs-primary);
}

.interactive-text .sentence {
    transition: background-color 0.3s ease;
    border-radius: 3px;
    padding: 1px 0;
    margin-right: 0.25em;
}

.interactive-text .sentence--selected {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
    border-radius: 3px;
    padding: 1px 2px;
}

/* Legacy: inline cursor spans (fallback) */
.interactive-text span[style*="cursor"] {
    transition: background-color 0.15s ease, color 0.15s ease;
    border-radius: 3px;
    padding: 1px 2px;
}

.interactive-text span[style*="cursor"]:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.15);
}

/* ── Audio generation banner ── */
.audio-gen-banner {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
    border: 1px solid rgba(var(--bs-primary-rgb), 0.3);
    border-radius: var(--bs-border-radius);
    padding: 0.75rem 1rem;
}

/* ── Reading page: fixed header/footer layout ── */
.reading-page {
    display: flex;
    flex-direction: column;
    /* Break out of <main>'s p-3 (1rem) padding to go edge-to-edge */
    margin: -1rem;
    /* Fill the entire main area */
    height: calc(100% + 2rem);
    overflow: hidden;
}
.reading-page__header {
    flex-shrink: 0;
    background: var(--bs-body-bg);
    border-bottom: 1px solid var(--bs-border-color);
    z-index: 10;
}
.reading-page__header .page-header {
    margin-bottom: 0;
}
.reading-page__content {
    flex: 1 1 0;
    overflow-y: auto;
    padding: 1rem;
    scroll-behavior: smooth;
}
.reading-page__footer {
    flex-shrink: 0;
    background-color: var(--bs-tertiary-bg);
    border-top: 1px solid var(--bs-border-color);
    padding: 0.5rem 1rem;
    z-index: 10;
}
.interactive-text-wrapper {
    line-height: 2;
}

@media (max-width: 767.98px) {
    .reading-page {
        /* Mobile main has: padding: 0 Xrem Xrem Xrem */
        margin: 0 -0.75rem -0.75rem;
        height: calc(100% + 0.75rem);
    }
    .reading-page__header .page-header {
        /* Reset mobile sticky header overrides — the reading-page handles its own layout */
        position: static;
        margin: 0;
        padding: 0;
    }
    .reading-page__footer {
        padding-bottom: calc(0.5rem + env(safe-area-inset-bottom, 0px));
    }
}

/* Legacy .audio-transport (for non-reading pages that may use it) */
.audio-transport {
    position: sticky;
    bottom: 0;
    background-color: var(--bs-tertiary-bg);
    border-top: 1px solid var(--bs-border-color);
    padding: 0.5rem 1rem;
    z-index: 10;
}

/* Waveform display: audio seeking */
.waveform-display {
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.waveform-display:hover {
    opacity: 0.85;
}

/* Audio player progress bar: seeking */
.audio-player__progress {
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.audio-player__progress:hover {
    opacity: 0.85;
}

/* Cloze quiz options */
.cloze-option {
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.cloze-option:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    border-color: var(--bs-primary) !important;
}

/* Vocabulary matching tiles */
.card-ss.clickable:not([style*="opacity: 0.5"]):hover {
    transform: scale(1.03);
}

/* Minimal pairs: word selection buttons */
.minimal-pair-option {
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.minimal-pair-option:hover {
    border-color: var(--bs-primary) !important;
    background-color: rgba(var(--bs-primary-rgb), 0.1);
}

/* Scene description: expandable sections */
.expandable-section {
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.expandable-section:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.08);
}

/* HowDoYouSay: history list items */
.history-item {
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.history-item:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.08);
}

/* Generic: any element with role="button" that isn't a card or button */
[role="button"]:not(.card-ss):not(.btn):not(button) {
    cursor: pointer;
    transition: filter 0.15s ease;
}

[role="button"]:not(.card-ss):not(.btn):not(button):hover {
    filter: brightness(1.1);
}

/* Dropdown items */
.dropdown-item {
    transition: background-color 0.15s ease, color 0.15s ease;
}

.dropdown-item:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.15);
    color: var(--bs-primary);
}

/* ============================================
   2026 AI WORKSPACE REFRESH
   ============================================ */

:root {
    --ss-shell-glow-1: rgba(63, 115, 255, 0.16);
    --ss-shell-glow-2: rgba(18, 184, 134, 0.1);
    --ss-shell-stroke: rgba(255, 255, 255, 0.45);
    --ss-shell-shadow: 0 28px 70px rgba(15, 23, 42, 0.10);
    --ss-shell-shadow-strong: 0 24px 56px rgba(15, 23, 42, 0.16);
    --ss-shell-radius: 28px;
    --ss-reader-measure: 44rem;
}

[data-bs-theme="dark"] {
    --ss-shell-glow-1: rgba(107, 140, 255, 0.22);
    --ss-shell-glow-2: rgba(33, 214, 164, 0.14);
    --ss-shell-stroke: rgba(255, 255, 255, 0.08);
    --ss-shell-shadow: 0 24px 72px rgba(0, 0, 0, 0.42);
    --ss-shell-shadow-strong: 0 24px 64px rgba(0, 0, 0, 0.50);
}

html,
body,
#app,
.ss-shell {
    background:
        radial-gradient(circle at top right, var(--ss-shell-glow-1), transparent 36%),
        radial-gradient(circle at bottom left, var(--ss-shell-glow-2), transparent 28%),
        linear-gradient(180deg, rgba(var(--bs-body-bg-rgb), 0.98), rgba(var(--bs-body-bg-rgb), 1));
}

.ss-shell {
    position: relative;
}

.ss-sidebar {
    width: 300px;
    margin: 18px 0 18px 18px;
    border: 1px solid var(--ss-shell-stroke);
    border-right: 1px solid var(--ss-shell-stroke);
    border-radius: calc(var(--ss-shell-radius) + 4px);
    background:
        linear-gradient(180deg, rgba(var(--bs-secondary-bg-rgb), 0.94), rgba(var(--bs-tertiary-bg-rgb), 0.88));
    box-shadow: var(--ss-shell-shadow);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    transition: width 0.24s ease, margin 0.24s ease;
}

.ss-sidebar.collapsed {
    width: 92px;
}

.ss-shell__body {
    min-width: 0;
}

.ss-main-content {
    padding: 18px !important;
    background: transparent;
}

.ss-main-scroll {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
}

.ss-mobile-nav {
    border-right: 1px solid var(--ss-shell-stroke);
    background:
        linear-gradient(180deg, rgba(var(--bs-secondary-bg-rgb), 0.98), rgba(var(--bs-tertiary-bg-rgb), 0.94));
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.ss-mobile-nav .offcanvas-header {
    border-bottom: 1px solid rgba(var(--bs-border-color-rgb), 0.55);
    padding-top: calc(env(safe-area-inset-top, 0px) + 16px);
}

.nav-ss {
    padding: 1rem;
}

.nav-ss__brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.9rem 0.95rem 1.15rem;
}

.nav-ss__brand-mark {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(var(--bs-primary-rgb), 0.18), rgba(var(--bs-info-rgb), 0.10));
    color: var(--bs-primary);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.nav-ss__brand-title {
    font-size: calc(16px * var(--ss-font-scale, 1));
    font-weight: 700;
    color: var(--bs-body-color);
}

.nav-ss__brand-subtitle {
    font-size: calc(12px * var(--ss-font-scale, 1));
    color: var(--bs-secondary-color);
}

.nav-ss__section-label {
    padding: 0 0.95rem;
    font-size: calc(11px * var(--ss-font-scale, 1));
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bs-tertiary-color);
}

.nav-ss__divider {
    height: 1px;
    margin: 0.4rem 0.95rem;
    background: linear-gradient(90deg, transparent, rgba(var(--bs-border-color-rgb), 0.8), transparent);
}

.nav-link-ss {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    color: var(--bs-secondary-color);
    border: 1px solid transparent;
    background: transparent;
    transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.nav-link-ss:hover {
    transform: translateX(2px);
    color: var(--bs-body-color);
    background: rgba(var(--bs-primary-rgb), 0.08);
    border-color: rgba(var(--bs-primary-rgb), 0.10);
}

.nav-link-ss.active {
    color: var(--bs-body-color);
    background: linear-gradient(135deg, rgba(var(--bs-primary-rgb), 0.16), rgba(var(--bs-info-rgb), 0.08));
    border-color: rgba(var(--bs-primary-rgb), 0.18);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.nav-link-ss--danger {
    width: 100%;
    border: 1px solid transparent;
    color: var(--bs-danger) !important;
    background: transparent;
}

.nav-link-ss--danger:hover {
    background: rgba(var(--bs-danger-rgb), 0.1);
    border-color: rgba(var(--bs-danger-rgb), 0.16);
}

.nav-link-ss__icon {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 0.85rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: rgba(var(--bs-body-color-rgb), 0.04);
}

.nav-link-ss__icon i {
    font-size: 1.05rem;
}

.sidebar-nav.collapsed .nav-ss {
    padding: 1rem 0.8rem;
}

.sidebar-nav.collapsed .nav-ss__brand-copy,
.sidebar-nav.collapsed .nav-ss__section-label,
.sidebar-nav.collapsed .nav-label,
.sidebar-nav.collapsed .nav-ss__divider {
    display: none;
}

.sidebar-nav.collapsed .nav-ss__brand {
    justify-content: center;
    padding-inline: 0;
}

.sidebar-nav.collapsed .nav-link-ss {
    justify-content: center;
    padding-left: 0.7rem !important;
    padding-right: 0.7rem !important;
}

.sidebar-nav.collapsed .nav-link-ss__icon {
    margin: 0;
}

.page-header {
    position: sticky;
    top: 0;
    z-index: 1030;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 1rem;
    padding: 0;
    background: transparent;
}

.page-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.15rem;
    border: 1px solid var(--ss-shell-stroke);
    border-radius: calc(var(--ss-shell-radius) - 6px);
    background:
        linear-gradient(180deg, rgba(var(--bs-secondary-bg-rgb), 0.94), rgba(var(--bs-tertiary-bg-rgb), 0.86));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--ss-shell-shadow);
}

.page-header-copy {
    min-width: 0;
}

.page-header-leading {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
}

.page-header-leading__buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.page-header-menu-button {
    border: 1px solid rgba(var(--bs-border-color-rgb), 0.82);
    background: rgba(var(--bs-secondary-bg-rgb), 0.78);
    color: var(--bs-body-color);
}

.page-header-kicker {
    margin-bottom: 0.2rem;
    font-size: calc(11px * var(--ss-font-scale, 1));
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bs-primary);
}

.page-header-title-wrap {
    min-width: 0;
}

.page-header-subtitle {
    font-size: calc(13px * var(--ss-font-scale, 1));
    color: var(--bs-secondary-color);
}

.page-header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.card-ss,
.card-ss-elevated {
    border: 1px solid var(--ss-shell-stroke);
    border-radius: calc(var(--ss-shell-radius) - 6px);
    background:
        linear-gradient(180deg, rgba(var(--bs-secondary-bg-rgb), 0.98), rgba(var(--bs-tertiary-bg-rgb), 0.90));
    box-shadow: var(--ss-shell-shadow);
}

.card-ss.clickable:hover,
.card-ss[role="button"]:hover {
    transform: translateY(-3px);
    border-color: rgba(var(--bs-primary-rgb), 0.22);
    box-shadow: var(--ss-shell-shadow-strong);
}

.btn-ss-primary,
.btn-ss-secondary,
.btn-outline-secondary,
.btn-icon {
    border-radius: 999px;
    min-height: 44px;
}

.btn-ss-primary {
    box-shadow: 0 14px 28px rgba(var(--bs-primary-rgb), 0.18);
}

.btn-ss-secondary,
.btn-outline-secondary,
.btn-icon {
    background: rgba(var(--bs-secondary-bg-rgb), 0.82);
    border-color: rgba(var(--bs-border-color-rgb), 0.85);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    color: var(--bs-body-color);
}

.btn-outline-secondary:hover,
.btn-ss-secondary:hover,
.btn-icon:hover {
    background: rgba(var(--bs-primary-rgb), 0.08);
    border-color: rgba(var(--bs-primary-rgb), 0.16);
    color: var(--bs-body-color);
}

.dropdown-menu {
    border-radius: 1rem;
    border: 1px solid var(--ss-shell-stroke);
    box-shadow: var(--ss-shell-shadow);
    background: rgba(var(--bs-secondary-bg-rgb), 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.dashboard-page {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.dashboard-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.8fr) minmax(280px, 1fr);
    gap: 1.5rem;
    align-items: center;
}

.dashboard-hero__eyebrow,
.dashboard-section-kicker {
    margin-bottom: 0.35rem;
    font-size: calc(11px * var(--ss-font-scale, 1));
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bs-primary);
}

.dashboard-hero__metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
}

.dashboard-hero__metric,
.dashboard-stat-card {
    padding: 1rem;
    border-radius: 1.2rem;
    background: rgba(var(--bs-body-bg-rgb), 0.55);
    border: 1px solid rgba(var(--bs-border-color-rgb), 0.55);
}

.dashboard-hero__metric-label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: calc(12px * var(--ss-font-scale, 1));
    color: var(--bs-secondary-color);
}

.dashboard-mode-switch {
    display: inline-flex;
    gap: 0.75rem;
    padding: 0.4rem;
    border: 1px solid var(--ss-shell-stroke);
    border-radius: 999px;
    background: rgba(var(--bs-secondary-bg-rgb), 0.72);
    box-shadow: var(--ss-shell-shadow);
    flex-wrap: wrap;
}

.dashboard-mode-switch .btn {
    flex: 1 1 180px;
}

.dashboard-panel {
    overflow: hidden;
}

.dashboard-progress-panel .progress {
    height: 10px !important;
    border-radius: 999px;
    background: rgba(var(--bs-body-color-rgb), 0.08);
}

.dashboard-plan-item {
    position: relative;
    overflow: hidden;
}

.dashboard-plan-item::after {
    content: "";
    position: absolute;
    inset: auto 0 0 0;
    height: 3px;
    background: linear-gradient(90deg, rgba(var(--bs-primary-rgb), 0.9), rgba(var(--bs-secondary-rgb), 0.65));
    opacity: 0;
    transition: opacity 0.18s ease;
}

.dashboard-plan-item:hover::after {
    opacity: 1;
}

.dashboard-streak .badge {
    padding: 0.7rem 0.95rem;
    border-radius: 999px;
}

.dashboard-selector-panel .ts-wrapper .ts-control,
.dashboard-selector-panel .ts-wrapper.single .ts-control {
    min-height: 52px;
    border-radius: 1rem;
}

.dashboard-activity-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 100%;
}

.dashboard-activity-card__icon {
    width: 3rem;
    height: 3rem;
    border-radius: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    color: var(--bs-primary);
    background: rgba(var(--bs-primary-rgb), 0.10);
}

.dashboard-activity-card__description {
    font-size: calc(13px * var(--ss-font-scale, 1));
    line-height: 1.55;
}

.dashboard-activity-card--reading {
    background:
        linear-gradient(180deg, rgba(var(--bs-primary-rgb), 0.12), rgba(var(--bs-tertiary-bg-rgb), 0.92));
}

.dashboard-reading-preview {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.dashboard-reading-preview__line {
    height: 8px;
    width: 100%;
    border-radius: 999px;
    background: rgba(var(--bs-body-color-rgb), 0.11);
}

.dashboard-reading-preview__line--strong {
    width: 88%;
    background: rgba(var(--bs-primary-rgb), 0.22);
}

.dashboard-reading-preview__line--short {
    width: 66%;
}

.reading-page {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: calc(100vh - 36px);
    margin: 0;
    height: auto;
    overflow: visible;
    position: relative;
}

.reading-page__header {
    background: transparent;
    border: 0;
}

.reading-page__header .page-header {
    margin-bottom: 0;
}

.reading-page__content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 0.5rem;
    overflow: visible;
}

.reading-empty-state {
    min-height: 40vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.reading-hero,
.reading-reader,
.reading-page__footer {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
}

.reading-hero {
    padding: 1.5rem 1.6rem;
    border: 1px solid rgba(153, 119, 66, 0.18);
    border-radius: calc(var(--ss-shell-radius) - 4px);
    background:
        radial-gradient(circle at top right, rgba(190, 146, 84, 0.18), transparent 38%),
        linear-gradient(180deg, rgba(255, 247, 228, 0.96), rgba(248, 235, 206, 0.92));
    box-shadow: 0 22px 50px rgba(96, 68, 28, 0.12);
}

.reading-hero__eyebrow,
.reading-word-panel__eyebrow {
    margin-bottom: 0.4rem;
    font-size: calc(11px * var(--ss-font-scale, 1));
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bs-primary);
}

.reading-hero__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.reading-hero__timer {
    flex-shrink: 0;
}

.reading-meta {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1.15rem;
}

.reading-meta__pill,
.reading-reader__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 249, 235, 0.86);
    border: 1px solid rgba(153, 119, 66, 0.16);
    color: #6b5330;
    font-size: calc(13px * var(--ss-font-scale, 1));
}

.reading-reader {
    position: relative;
    border: 1px solid rgba(153, 119, 66, 0.18);
    border-radius: calc(var(--ss-shell-radius) + 2px);
    background:
        radial-gradient(circle at top left, rgba(255, 248, 227, 0.94), transparent 32%),
        radial-gradient(circle at bottom right, rgba(233, 214, 176, 0.4), transparent 28%),
        linear-gradient(180deg, #fbf1da 0%, #f6ebd0 48%, #f2e2bc 100%);
    box-shadow:
        0 26px 60px rgba(102, 70, 28, 0.14),
        inset 0 1px 0 rgba(255, 255, 255, 0.46);
    overflow: hidden;
}

.reading-reader::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        linear-gradient(90deg, rgba(107, 78, 36, 0.08), transparent 4%, transparent 96%, rgba(107, 78, 36, 0.06)),
        linear-gradient(180deg, rgba(255, 255, 255, 0.22), transparent 14%, transparent 86%, rgba(131, 94, 39, 0.05));
}

.reading-reader::after {
    content: "";
    position: absolute;
    inset: 16px;
    border-radius: calc(var(--ss-shell-radius) - 6px);
    border: 1px solid rgba(133, 96, 40, 0.08);
    pointer-events: none;
}

.reading-reader__topbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.15rem;
    border-bottom: 1px solid rgba(153, 119, 66, 0.14);
    background:
        linear-gradient(180deg, rgba(128, 93, 39, 0.08), rgba(255, 250, 239, 0.28));
}

.reading-reader__label {
    font-size: calc(13px * var(--ss-font-scale, 1));
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8d6130;
}

.reading-reader__hint {
    margin-top: 0.3rem;
    font-size: calc(13px * var(--ss-font-scale, 1));
    color: #756142;
}

.reading-reader__badges {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.reading-reader__body {
    padding: clamp(1.25rem, 3vw, 2.25rem);
}

.interactive-text-wrapper {
    max-width: var(--ss-reader-measure);
    margin: 0 auto;
    padding: clamp(1.35rem, 3vw, 2.4rem);
    border-radius: 1.6rem;
    border: 1px solid rgba(133, 96, 40, 0.1);
    background:
        linear-gradient(180deg, rgba(255, 252, 244, 0.72), rgba(255, 248, 230, 0.58));
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        inset 0 0 0 1px rgba(255, 252, 244, 0.32);
}

.interactive-text {
    font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
    font-size: inherit;
    line-height: 2.02;
    letter-spacing: 0.012em;
    color: #3d2f1f;
    text-rendering: optimizeLegibility;
}

.interactive-text__paragraph {
    margin: 0 0 1.5em;
    text-indent: 1.35em;
}

.interactive-text__paragraph:first-child {
    text-indent: 0;
}

.reading-reader .word:hover {
    background-color: rgba(156, 110, 42, 0.12);
    box-shadow: 0 0 0 1px rgba(156, 110, 42, 0.12);
}

.reading-reader .word--vocab {
    color: #85531c;
    text-decoration-color: rgba(133, 83, 28, 0.34);
}

.reading-reader .word--vocab:hover {
    background-color: rgba(156, 110, 42, 0.14);
}

.reading-reader .sentence--selected {
    background-color: rgba(133, 83, 28, 0.09);
    box-shadow: 0 0 0 1px rgba(133, 83, 28, 0.14);
}

.audio-gen-banner {
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid rgba(var(--bs-primary-rgb), 0.18);
    border-radius: 1.25rem;
    background: rgba(var(--bs-primary-rgb), 0.08);
    box-shadow: var(--ss-shell-shadow);
}

.reading-page__footer {
    position: sticky;
    bottom: 0.5rem;
    padding-bottom: calc(0.35rem + env(safe-area-inset-bottom, 0px));
    padding-inline: 0;
    border: 0;
    background: transparent;
}

.reading-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(153, 119, 66, 0.16);
    border-radius: calc(var(--ss-shell-radius) - 8px);
    background:
        linear-gradient(180deg, rgba(255, 248, 229, 0.96), rgba(247, 233, 201, 0.92));
    box-shadow: 0 18px 36px rgba(101, 73, 30, 0.12);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.reading-controls__transport,
.reading-controls__settings {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.reading-controls__play {
    min-width: 48px;
}

.reading-controls__counter,
.reading-controls__time {
    font-size: calc(13px * var(--ss-font-scale, 1));
    color: #6f5a3a;
}

.reading-inline-control {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.3rem 0.3rem 0.3rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 252, 244, 0.72);
    border: 1px solid rgba(153, 119, 66, 0.14);
}

.reading-inline-control__label {
    font-size: calc(12px * var(--ss-font-scale, 1));
    font-weight: 600;
    color: #715c3d;
}

.reading-inline-control .form-select {
    min-width: 90px;
    border: none;
    background-color: transparent;
    box-shadow: none;
}

.reading-inline-control--range .form-range {
    width: 140px;
    margin: 0;
}

.reading-word-panel {
    height: auto;
    max-height: 48vh;
    border-radius: var(--ss-shell-radius) var(--ss-shell-radius) 0 0;
    border-top: 1px solid var(--ss-shell-stroke);
    background: rgba(var(--bs-secondary-bg-rgb), 0.98);
    box-shadow: var(--ss-shell-shadow-strong);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

@media (max-width: 991.98px) {
    .dashboard-hero {
        grid-template-columns: 1fr;
    }

    .dashboard-hero__metrics {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .reading-hero__header,
    .reading-reader__topbar,
    .reading-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .reading-reader__badges {
        justify-content: flex-start;
    }
}

@media (max-width: 767.98px) {
    .ss-main-content {
        padding: 12px !important;
    }

    .page-header-inner {
        padding: 0.9rem 1rem;
        border-radius: 1.2rem;
    }

    .page-header-subtitle {
        display: none;
    }

    .page-header-leading {
        gap: 0.55rem;
    }

    .page-header-leading__buttons {
        gap: 0.35rem;
    }

    .dashboard-hero__metrics {
        grid-template-columns: 1fr;
    }

    .dashboard-mode-switch {
        width: 100%;
    }

    .dashboard-mode-switch .btn {
        flex-basis: 100%;
    }

    .reading-hero,
    .reading-reader,
    .reading-page__footer,
    .audio-gen-banner {
        max-width: 100%;
    }

    .reading-page {
        margin: 0;
        min-height: auto;
    }

    .reading-hero,
    .reading-reader__body,
    .reading-controls {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .interactive-text-wrapper {
        padding: 1rem 1rem 1.15rem;
        border-radius: 1.2rem;
    }

    .reading-inline-control,
    .reading-inline-control--range {
        width: 100%;
        justify-content: space-between;
    }

    .reading-inline-control--range .form-range {
        width: 100%;
    }
}

/* ─── Shared activity page layout (sticky bottom input) ─── */
.activity-page-wrapper {
    display: flex;
    flex-direction: column;
    height: calc(100% + 2rem); /* 100% of main content-box + 2rem to fill negative margins */
    margin: -1rem; /* counteract main padding so wrapper fills the area */
    padding: 1rem; /* re-apply padding inside */
}

.activity-content {
    flex: 1;
    overflow-y: auto;
    min-height: 0; /* allow flex child to shrink */
}

.activity-input-bar {
    flex-shrink: 0;
    background: var(--bs-body-bg);
    border-top: 1px solid var(--bs-border-color);
    padding: 0.75rem 1rem;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
    margin: 0 -1rem; /* bleed edge-to-edge within content area */
    margin-bottom: -1rem;
}

.activity-input-bar textarea {
    resize: none;
    font-size: calc(16px * var(--ss-font-scale, 1));
    min-height: 2.5rem;
}

.activity-footer {
    flex-shrink: 0;
    background: var(--bs-body-bg);
    border-top: 1px solid var(--bs-border-color);
    padding: 0.75rem 1rem;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
    margin: 0 -1rem;
    margin-bottom: -1rem;
}

/* ─── Vocabulary Matching tile grid ─── */
.matching-tile-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 0.75rem;
    align-content: stretch;
    min-height: 0;
}
@media (max-width: 768px) {
    .matching-tile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ─── Scene page: Gallery Overlay ─── */
.scene-gallery-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1060;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.scene-gallery-overlay {
    position: fixed;
    top: 5vh;
    left: 5vw;
    right: 5vw;
    bottom: 5vh;
    z-index: 1070;
    background: var(--bs-body-bg);
    border-radius: 1rem;
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.scene-gallery-grid {
    flex: 1;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
    align-content: start;
}

.scene-gallery-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: 0.5rem;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.scene-gallery-item:hover {
    transform: scale(1.03);
    border-color: var(--bs-primary);
}

.scene-gallery-item.active {
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 2px var(--bs-primary);
}

.scene-gallery-item.selected {
    border-color: var(--bs-primary);
    opacity: 0.85;
}

.scene-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scene-gallery-active-badge {
    position: absolute;
    top: 0.375rem;
    left: 0.375rem;
    background: var(--bs-primary);
    color: var(--ss-on-primary, #fff);
    font-size: 0.675rem;
    font-weight: 600;
    padding: 0.125rem 0.5rem;
    border-radius: 1rem;
}

.scene-gallery-checkbox {
    position: absolute;
    bottom: 0.375rem;
    right: 0.375rem;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 50%;
    width: 1.75rem;
    height: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 767.98px) {
    .scene-gallery-overlay {
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        border-radius: 0;
    }

    .scene-gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .activity-content {
        flex: 1;
    }
}

/* ============================================
   VOCABULARY PAGE MOBILE IMPROVEMENTS
   ============================================ */

/* Resource associations - truncate titles at 2 lines */
.resource-title-truncate {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
    max-height: calc(1.4em * 2);
}

/* Resource associations list - vertical scroll only, no horizontal */
.resource-associations-list {
    overflow-x: hidden;
}

/* ============================================
   ENVIRONMENT BADGE
   ============================================ */

.env-badge {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 10000;
    padding: 2px 24px;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    transform: rotate(45deg) translate(22%, -40%);
    transform-origin: top right;
    pointer-events: none;
    opacity: 0.9;
    line-height: 1.6;
    white-space: nowrap;
}

.env-badge-dev {
    background: #e67e22;
}

.env-badge-local {
    background: #3498db;
}

/* Safe area adjustment for iOS notch */
@supports (padding-top: env(safe-area-inset-top)) {
    .env-badge {
        top: env(safe-area-inset-top, 0px);
    }
}

/* ============================================
   SPIN ANIMATION FOR REFRESH ICON
   ============================================ */

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.spin {
    animation: spin 1s linear infinite;
}

/* ============================================
   MOBILE SAFARI STABILITY
   ============================================ */

html {
    min-height: 100%;
    min-height: -webkit-fill-available;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    min-height: -webkit-fill-available;
}

.ss-shell.vh-100 {
    min-height: 100vh;
    min-height: 100dvh;
    height: 100vh;
    height: 100dvh;
}

.ss-main-scroll {
    padding-bottom: calc(0.35rem + env(safe-area-inset-bottom, 0px));
}

@supports (-webkit-touch-callout: none) {
    .ss-shell.vh-100 {
        min-height: -webkit-fill-available;
    }
}

@media (max-width: 767.98px) {
    .page-header-actions {
        flex-wrap: wrap;
        width: 100%;
        justify-content: flex-end;
    }

    .page-header-actions > * {
        min-width: 0;
    }

    .page-header-copy {
        flex: 1 1 auto;
    }

    .form-control-ss,
    .form-control-ss.form-select,
    textarea.form-control-ss {
        font-size: calc(16px * var(--ss-font-scale, 1));
    }
}