/* ============================================
   MATERIAL 3 EXPRESSIVE DESIGN TOKENS
   ============================================ */

:root {
    /* === Color Palette - Gender Colors === */
    /* Blue for der (masculine) */
    --md-ref-palette-masculine10: #001d36;
    --md-ref-palette-masculine20: #003258;
    --md-ref-palette-masculine30: #00497d;
    --md-ref-palette-masculine40: #0061a4;
    --md-ref-palette-masculine50: #2b7bc0;
    --md-ref-palette-masculine60: #4a95db;
    --md-ref-palette-masculine80: #9ecaff;
    --md-ref-palette-masculine90: #d1e4ff;
    --md-ref-palette-masculine95: #e9f1ff;

    /* Pink for die (feminine) */
    --md-ref-palette-feminine10: #3e001d;
    --md-ref-palette-feminine20: #5e1133;
    --md-ref-palette-feminine30: #7b2949;
    --md-ref-palette-feminine40: #994060;
    --md-ref-palette-feminine50: #b65878;
    --md-ref-palette-feminine60: #d47191;
    --md-ref-palette-feminine80: #ffb1c4;
    --md-ref-palette-feminine90: #ffd9e1;
    --md-ref-palette-feminine95: #ffecef;

    /* Green for das (neuter) */
    --md-ref-palette-neuter10: #002106;
    --md-ref-palette-neuter20: #003910;
    --md-ref-palette-neuter30: #00531b;
    --md-ref-palette-neuter40: #43a047;
    --md-ref-palette-neuter50: #1e8a3e;
    --md-ref-palette-neuter60: #3da656;
    --md-ref-palette-neuter80: #81c784;
    --md-ref-palette-neuter90: #c8e6c9;
    --md-ref-palette-neuter95: #e8f5e9;

    /* === M3 System Colors (Light Theme) === */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;

    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;

    --md-sys-color-surface: #FEF7FF;
    --md-sys-color-on-surface: #1D1B20;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;

    --md-sys-color-surface-container-lowest: #ffffff;
    --md-sys-color-surface-container-low: #F7F2FA;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
    --md-sys-color-surface-container-highest: #E6E0E9;

    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;

    --md-sys-color-error: #BA1A1A;
    --md-sys-color-on-error: #ffffff;
    --md-sys-color-success: #006e26;
    --md-sys-color-on-success: #ffffff;

    /* Gender-specific semantic colors */
    --color-der: var(--md-ref-palette-masculine40);
    --color-der-container: var(--md-ref-palette-masculine90);
    --color-der-container-bright: var(--md-ref-palette-masculine95);
    --color-on-der-container: var(--md-ref-palette-masculine10);

    --color-die: var(--md-ref-palette-feminine40);
    --color-die-container: var(--md-ref-palette-feminine90);
    --color-die-container-bright: var(--md-ref-palette-feminine95);
    --color-on-die-container: var(--md-ref-palette-feminine10);

    --color-das: var(--md-ref-palette-neuter40);
    --color-das-container: var(--md-ref-palette-neuter90);
    --color-das-container-bright: var(--md-ref-palette-neuter95);
    --color-on-das-container: var(--md-ref-palette-neuter10);

    /* Button colors (same as base in light mode) */
    --color-der-button: var(--md-ref-palette-masculine40);
    --color-die-button: var(--md-ref-palette-feminine40);
    --color-das-button: var(--md-ref-palette-neuter40);

    /* === Typography (M3 Expressive) === */
    --md-sys-typescale-font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;

    /* Display - Large optical sizes, tighter tracking */
    --md-sys-typescale-display-large: 700 57px/64px var(--md-sys-typescale-font-family);
    --md-sys-typescale-display-medium: 700 45px/52px var(--md-sys-typescale-font-family);
    --md-sys-typescale-display-small: 600 36px/44px var(--md-sys-typescale-font-family);

    /* Headline - Prominent, expressive */
    --md-sys-typescale-headline-large: 600 32px/40px var(--md-sys-typescale-font-family);
    --md-sys-typescale-headline-medium: 600 28px/36px var(--md-sys-typescale-font-family);
    --md-sys-typescale-headline-small: 600 24px/32px var(--md-sys-typescale-font-family);

    /* Title - Medium prominence */
    --md-sys-typescale-title-large: 600 22px/28px var(--md-sys-typescale-font-family);
    --md-sys-typescale-title-medium: 600 16px/24px var(--md-sys-typescale-font-family);
    --md-sys-typescale-title-small: 500 14px/20px var(--md-sys-typescale-font-family);

    /* Body - Readable, comfortable */
    --md-sys-typescale-body-large: 400 16px/24px var(--md-sys-typescale-font-family);
    --md-sys-typescale-body-medium: 400 14px/20px var(--md-sys-typescale-font-family);
    --md-sys-typescale-body-small: 400 12px/16px var(--md-sys-typescale-font-family);

    /* Label - Utility text */
    --md-sys-typescale-label-large: 600 14px/20px var(--md-sys-typescale-font-family);
    --md-sys-typescale-label-medium: 500 12px/16px var(--md-sys-typescale-font-family);
    --md-sys-typescale-label-small: 500 11px/16px var(--md-sys-typescale-font-family);

    /* Letter spacing for expressive typography */
    --md-sys-typescale-tracking-tight: -0.5px;
    --md-sys-typescale-tracking-normal: 0;
    --md-sys-typescale-tracking-wide: 0.5px;

    /* === Shape === */
    --md-sys-shape-corner-none: 0px;
    --md-sys-shape-corner-extra-small: 4px;
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;
    --md-sys-shape-corner-full: 9999px;

    /* === Motion (M3 Expressive) === */
    --md-sys-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
    --md-sys-motion-easing-emphasized-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
    --md-sys-motion-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
    --md-sys-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);

    /* Spring-based easing for expressive motion */
    --md-sys-motion-spring-default: linear(
        0, 0.006, 0.025 2.8%, 0.101 6.1%, 0.539 18.9%,
        0.721 25.3%, 0.849 31.5%, 0.937 38.1%,
        0.968, 0.991, 1.006 50.6%, 1.015, 1.017 57.4%,
        1.014 59.9%, 1.01, 1.004 65.4%, 0.998 68.9%,
        0.994 72.2%, 0.995 80.2%, 0.999 87.8%, 1
    );

    --md-sys-motion-spring-bouncy: linear(
        0, 0.004, 0.016, 0.035, 0.063 9.1%, 0.141 13.6%, 0.25 18.2%,
        0.891 36.4%, 1.048 43.2%, 1.121 47.7%, 1.139 50%,
        1.132, 1.106, 1.067 59.1%, 0.99 68.2%, 0.977 72.7%,
        0.981 79.5%, 1 86.4%, 1
    );

    --md-sys-motion-duration-short1: 50ms;
    --md-sys-motion-duration-short2: 100ms;
    --md-sys-motion-duration-short3: 150ms;
    --md-sys-motion-duration-short4: 200ms;
    --md-sys-motion-duration-medium1: 250ms;
    --md-sys-motion-duration-medium2: 300ms;
    --md-sys-motion-duration-medium3: 350ms;
    --md-sys-motion-duration-medium4: 400ms;
    --md-sys-motion-duration-long1: 450ms;
    --md-sys-motion-duration-long2: 500ms;

    /* === Elevation (M3 Expressive: no shadows, use tonal surfaces) === */
    --md-sys-elevation-level0: none;
    --md-sys-elevation-level1: none;
    --md-sys-elevation-level2: none;
    --md-sys-elevation-level3: none;
    --md-sys-elevation-level4: none;
    --md-sys-elevation-level5: none;

    /* === Spacing === */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

/* === Dark Theme === */
@media (prefers-color-scheme: dark) {
    :root {
        --md-sys-color-primary: #D0BCFF;
        --md-sys-color-on-primary: #381E72;
        --md-sys-color-primary-container: #4F378B;
        --md-sys-color-on-primary-container: #EADDFF;

        --md-sys-color-secondary: #CCC2DC;
        --md-sys-color-on-secondary: #332D41;
        --md-sys-color-secondary-container: #4A4458;
        --md-sys-color-on-secondary-container: #E8DEF8;

        --md-sys-color-surface: #141218;
        --md-sys-color-on-surface: #E6E0E9;
        --md-sys-color-surface-variant: #49454F;
        --md-sys-color-on-surface-variant: #CAC4D0;

        --md-sys-color-surface-container-lowest: #0F0D13;
        --md-sys-color-surface-container-low: #1D1B20;
        --md-sys-color-surface-container: #211F26;
        --md-sys-color-surface-container-high: #2B2930;
        --md-sys-color-surface-container-highest: #36343B;

        --md-sys-color-outline: #938F99;
        --md-sys-color-outline-variant: #49454F;

        /* Gender colors (dark mode) */
        --color-der: var(--md-ref-palette-masculine80);
        --color-der-container: var(--md-ref-palette-masculine30);
        --color-der-container-bright: var(--md-ref-palette-masculine20);
        --color-on-der-container: var(--md-ref-palette-masculine90);

        --color-die: var(--md-ref-palette-feminine80);
        --color-die-container: var(--md-ref-palette-feminine30);
        --color-die-container-bright: var(--md-ref-palette-feminine20);
        --color-on-die-container: var(--md-ref-palette-feminine90);

        --color-das: var(--md-ref-palette-neuter80);
        --color-das-container: var(--md-ref-palette-neuter30);
        --color-das-container-bright: var(--md-ref-palette-neuter20);
        --color-on-das-container: var(--md-ref-palette-neuter90);

        /* More saturated button colors for dark mode */
        --color-der-button: var(--md-ref-palette-masculine50);
        --color-die-button: var(--md-ref-palette-feminine50);
        --color-das-button: var(--md-ref-palette-neuter50);

        /* M3: Dark mode uses tonal surfaces, not shadows */
        --md-sys-elevation-level1: none;
        --md-sys-elevation-level2: none;
        --md-sys-elevation-level3: none;
    }
}

/* Manual theme override */
[data-theme="dark"] {
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;

    --md-sys-color-secondary: #CCC2DC;
    --md-sys-color-on-secondary: #332D41;
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;

    --md-sys-color-surface: #141218;
    --md-sys-color-on-surface: #E6E0E9;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;

    --md-sys-color-surface-container-lowest: #0F0D13;
    --md-sys-color-surface-container-low: #1D1B20;
    --md-sys-color-surface-container: #211F26;
    --md-sys-color-surface-container-high: #2B2930;
    --md-sys-color-surface-container-highest: #36343B;

    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #49454F;

    --color-der: var(--md-ref-palette-masculine80);
    --color-der-container: var(--md-ref-palette-masculine30);
    --color-der-container-bright: var(--md-ref-palette-masculine20);
    --color-on-der-container: var(--md-ref-palette-masculine90);

    --color-die: var(--md-ref-palette-feminine80);
    --color-die-container: var(--md-ref-palette-feminine30);
    --color-die-container-bright: var(--md-ref-palette-feminine20);
    --color-on-die-container: var(--md-ref-palette-feminine90);

    --color-das: var(--md-ref-palette-neuter80);
    --color-das-container: var(--md-ref-palette-neuter30);
    --color-das-container-bright: var(--md-ref-palette-neuter20);
    --color-on-das-container: var(--md-ref-palette-neuter90);

    /* More saturated button colors for dark mode */
    --color-der-button: var(--md-ref-palette-masculine50);
    --color-die-button: var(--md-ref-palette-feminine50);
    --color-das-button: var(--md-ref-palette-neuter50);

    /* M3: Dark mode uses tonal surfaces, not shadows */
    --md-sys-elevation-level1: none;
    --md-sys-elevation-level2: none;
    --md-sys-elevation-level3: none;
}

[data-theme="light"] {
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;

    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;

    --md-sys-color-surface: #FEF7FF;
    --md-sys-color-on-surface: #1D1B20;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;

    --md-sys-color-surface-container-lowest: #ffffff;
    --md-sys-color-surface-container-low: #F7F2FA;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
    --md-sys-color-surface-container-highest: #E6E0E9;

    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;

    --color-der: var(--md-ref-palette-masculine40);
    --color-der-container: var(--md-ref-palette-masculine90);
    --color-der-container-bright: var(--md-ref-palette-masculine95);
    --color-on-der-container: var(--md-ref-palette-masculine10);

    --color-die: var(--md-ref-palette-feminine40);
    --color-die-container: var(--md-ref-palette-feminine90);
    --color-die-container-bright: var(--md-ref-palette-feminine95);
    --color-on-die-container: var(--md-ref-palette-feminine10);

    --color-das: var(--md-ref-palette-neuter40);
    --color-das-container: var(--md-ref-palette-neuter90);
    --color-das-container-bright: var(--md-ref-palette-neuter95);
    --color-on-das-container: var(--md-ref-palette-neuter10);
}

/* ============================================
   BASE STYLES
   ============================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font: var(--md-sys-typescale-body-large);
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100%;
    height: 100dvh;
    max-width: 480px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

/* ============================================
   HEADER
   ============================================ */

.app-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-top: max(var(--spacing-sm), env(safe-area-inset-top));
    background: var(--md-sys-color-surface);
    z-index: 100;
    min-height: 56px;
    gap: var(--spacing-xs);
}

.header-back {
    flex-shrink: 0;
}

.app-logo {
    font: var(--md-sys-typescale-title-large);
    font-weight: 700;
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    display: flex;
    gap: 2px;
    flex: 1;
    margin: 0;
}

.logo-der { color: var(--color-der); }
.logo-die { color: var(--color-die); }
.logo-das { color: var(--color-das); }

.icon-button {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard);
    font-size: 24px;
}

.icon-button:hover {
    background: var(--md-sys-color-surface-variant);
}

.icon-button:active {
    transform: scale(0.92);
}

/* Material Symbols */
.material-symbols-rounded {
    font-family: 'Material Symbols Rounded';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    font-variation-settings:
        'FILL' 0,
        'wght' 400,
        'GRAD' 0,
        'opsz' 24;
}

.material-symbols-rounded.filled {
    font-variation-settings:
        'FILL' 1,
        'wght' 400,
        'GRAD' 0,
        'opsz' 24;
}

/* ============================================
   SCREENS CONTAINER
   ============================================ */

.screens-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.screen {
    position: absolute;
    inset: 0;
    padding: var(--spacing-md);
    padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateX(20px);
    transition:
        opacity var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized),
        transform var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized),
        visibility 0s var(--md-sys-motion-duration-medium2);
    overflow-y: auto;
    overflow-x: hidden;
}

.screen.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(0);
    transition:
        opacity var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized),
        transform var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized),
        visibility 0s 0s;
}

/* ============================================
   HOME SCREEN
   ============================================ */

.stats-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.accuracy-card {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--md-sys-color-surface-container-low);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: var(--spacing-xl);
}

.accuracy-ring {
    position: relative;
    width: 200px;
    height: 200px;
}

.accuracy-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.accuracy-ring .ring-bg {
    fill: none;
    stroke: var(--md-sys-color-surface-variant);
    stroke-width: 10;
    stroke-linecap: round;
}

.accuracy-ring .ring-progress {
    fill: none;
    stroke: var(--md-sys-color-primary);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 282.743;
    stroke-dashoffset: 282.743;
    transition: stroke-dashoffset 1s var(--md-sys-motion-spring-default);
}

.accuracy-ring .accuracy-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
}

.accuracy-ring .accuracy-value {
    font: var(--md-sys-typescale-display-medium);
    color: var(--md-sys-color-on-surface);
}

.accuracy-ring .accuracy-label {
    font: var(--md-sys-typescale-label-large);
    color: var(--md-sys-color-on-surface-variant);
}

.stats-row {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-md);
    width: 100%;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    flex: 1;
    min-width: 0;
    background: var(--md-sys-color-surface-container-low);
    border-radius: var(--md-sys-shape-corner-large);
    padding: var(--spacing-md) var(--spacing-sm);
}

.stat-main {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stat-icon {
    font-size: 24px;
    color: var(--md-sys-color-primary);
}

.stat-icon.filled {
    font-variation-settings:
        'FILL' 1,
        'wght' 500,
        'GRAD' 0,
        'opsz' 24;
}

/* Fire icon gets orange color */
.stat:first-child .stat-icon {
    color: #f57c00;
}

/* Game controller gets lime color */
.stat:nth-child(2) .stat-icon {
    color: #9ccc65;
}

/* Books icon gets blue color */
.stat:last-child .stat-icon {
    color: #42a5f5;
}

.stat-value {
    font: var(--md-sys-typescale-headline-large);
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    color: var(--md-sys-color-on-surface);
}

.stat-label {
    font: var(--md-sys-typescale-label-large);
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
}

.mode-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    flex: 1;
}

.mode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    background: var(--md-sys-color-surface-container-high);
    border: none;
    border-radius: var(--md-sys-shape-corner-extra-large);
    cursor: pointer;
    transition:
        transform var(--md-sys-motion-duration-short4) var(--md-sys-motion-spring-default),
        background var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard);
    flex: 1;
    min-height: 120px;
}

.mode-card:hover {
    background: var(--md-sys-color-surface-container-highest);
}

.mode-card:active {
    transform: scale(0.97);
}

.mode-card .icon {
    font-size: 40px;
    color: var(--md-sys-color-primary);
    font-variation-settings:
        'FILL' 1,
        'wght' 500,
        'GRAD' 0,
        'opsz' 40;
}

.mode-card .title {
    font: var(--md-sys-typescale-title-large);
    color: var(--md-sys-color-on-surface);
}

.mode-card .description {
    font: var(--md-sys-typescale-body-medium);
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
}

.mode-card:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.mode-card:disabled:hover {
    background: var(--md-sys-color-surface-container-high);
    transform: none;
}

.mode-card:disabled:active {
    transform: none;
}

/* ============================================
   PROGRESS INDICATORS
   ============================================ */

.progress-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.progress-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-surface-variant);
    transition:
        background var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),
        transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-default);
}

.progress-dot.active {
    background: var(--md-sys-color-primary);
    transform: scale(1.25);
}

.progress-dot.completed {
    background: var(--md-sys-color-primary);
}

.progress-bar {
    height: 4px;
    background: var(--md-sys-color-surface-variant);
    border-radius: var(--md-sys-shape-corner-full);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--md-sys-color-primary);
    border-radius: var(--md-sys-shape-corner-full);
    transition: width var(--md-sys-motion-duration-medium2) var(--md-sys-motion-spring-default);
    width: 0%;
}

/* ============================================
   FLASHCARD
   ============================================ */

.flashcard-container {
    flex: 1;
    perspective: 1200px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) 0;
    min-height: 300px;
}

.flashcard {
    width: 100%;
    max-width: 360px;
    height: 280px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform var(--md-sys-motion-duration-medium4) var(--md-sys-motion-spring-default);
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard.resetting {
    transition: none !important;
}

.flashcard.fade-out {
    animation: fadeOut 150ms ease-out forwards;
}

.flashcard.fade-in {
    animation: fadeIn 150ms ease-in forwards;
}

@keyframes fadeOut {
    to { opacity: 0; transform: scale(0.95); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    border-radius: var(--md-sys-shape-corner-extra-large);
    gap: var(--spacing-md);
}

.flashcard-front {
    background: var(--md-sys-color-surface-container-high);
}

.flashcard-back {
    transform: rotateY(180deg);
}

.flashcard[data-gender="der"] .flashcard-back {
    background: var(--color-der-container);
    color: var(--color-on-der-container);
}

.flashcard[data-gender="die"] .flashcard-back {
    background: var(--color-die-container);
    color: var(--color-on-die-container);
}

.flashcard[data-gender="das"] .flashcard-back {
    background: var(--color-das-container);
    color: var(--color-on-das-container);
}

.rule-type {
    font: var(--md-sys-typescale-label-large);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--md-sys-color-on-surface-variant);
    background: var(--md-sys-color-surface-variant);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--md-sys-shape-corner-full);
}

.rule-pattern {
    font: var(--md-sys-typescale-display-small);
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    color: var(--md-sys-color-on-surface);
    text-align: center;
}

.tap-hint {
    font: var(--md-sys-typescale-body-small);
    color: var(--md-sys-color-on-surface-variant);
    margin-top: auto;
}

.gender-article {
    font: var(--md-sys-typescale-display-medium);
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    font-weight: 700;
}

.rule-description {
    font: var(--md-sys-typescale-body-large);
    text-align: center;
    opacity: 0.9;
}

.examples-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font: var(--md-sys-typescale-title-medium);
}

.examples-front {
    font: var(--md-sys-typescale-body-medium);
    color: var(--md-sys-color-on-surface-variant);
    margin-top: var(--spacing-sm);
}

.flashcard-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-md) 0;
}

.nav-button {
    width: 56px;
    height: 56px;
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    transition:
        transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-default),
        background var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard);
}

.nav-button:hover {
    background: var(--md-sys-color-surface-container-highest);
}

.nav-button:active {
    transform: scale(0.9);
}

.nav-button.primary {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.nav-button.primary:hover {
    background: var(--md-sys-color-primary);
    filter: brightness(1.1);
}

.nav-button:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

/* ============================================
   QUIZ
   ============================================ */

.quiz-card {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    background: var(--md-sys-color-surface-container-high);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    min-height: 200px;
    position: relative;
}

.quiz-word {
    font: var(--md-sys-typescale-display-small);
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    color: var(--md-sys-color-on-surface);
    text-align: center;
}

/* Article revealed after answer */
.quiz-article {
    font: var(--md-sys-typescale-headline-medium);
    font-weight: 700;
    letter-spacing: var(--md-sys-typescale-tracking-tight);
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--md-sys-motion-duration-medium2) var(--md-sys-motion-spring-default);
}

.quiz-article.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Gender colors for revealed article */
.quiz-card[data-gender="der"] .quiz-article { color: var(--color-der); }
.quiz-card[data-gender="die"] .quiz-article { color: var(--color-die); }
.quiz-card[data-gender="das"] .quiz-article { color: var(--color-das); }

.quiz-hint {
    font: var(--md-sys-typescale-body-medium);
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
    background: var(--md-sys-color-surface-variant);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--md-sys-shape-corner-full);
}

.answer-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.answer-button {
    padding: var(--spacing-lg) var(--spacing-md);
    border: none;
    border-radius: var(--md-sys-shape-corner-extra-large);
    font: var(--md-sys-typescale-title-large);
    font-weight: 600;
    cursor: pointer;
    transition:
        transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-default),
        filter var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard);
    color: white;
}

.answer-button:hover {
    filter: brightness(1.1);
}

.answer-button:active {
    transform: scale(0.95);
}

.answer-button:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.answer-button.gender-der {
    background: var(--color-der-button);
}

.answer-button.gender-die {
    background: var(--color-die-button);
}

.answer-button.gender-das {
    background: var(--color-das-button);
}

.answer-button.correct {
    animation: correctPulse var(--md-sys-motion-duration-medium2) var(--md-sys-motion-spring-bouncy);
}

.answer-button.incorrect {
    animation: incorrectShake var(--md-sys-motion-duration-short4) ease-in-out;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-6px); }
    80% { transform: translateX(6px); }
}

.feedback-overlay {
    position: absolute;
    inset: 0;
    background: var(--md-sys-color-surface-container-high);
    border-radius: var(--md-sys-shape-corner-extra-large);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transform: scale(0.9);
    transition:
        opacity var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
        transform var(--md-sys-motion-duration-short4) var(--md-sys-motion-spring-default),
        visibility 0s var(--md-sys-motion-duration-short4);
}

.feedback-overlay.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
    transition:
        opacity var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard),
        transform var(--md-sys-motion-duration-short4) var(--md-sys-motion-spring-default),
        visibility 0s 0s;
}

.feedback-icon {
    font-size: 48px;
}

.feedback-icon.correct,
.feedback-icon.incorrect {
    color: var(--md-sys-color-primary);
}

.feedback-text {
    font: var(--md-sys-typescale-title-large);
    color: var(--md-sys-color-on-surface);
}

.feedback-correct {
    font: var(--md-sys-typescale-headline-medium);
    font-weight: 700;
    letter-spacing: var(--md-sys-typescale-tracking-tight);
}

.feedback-correct.gender-der { color: var(--color-der); }
.feedback-correct.gender-die { color: var(--color-die); }
.feedback-correct.gender-das { color: var(--color-das); }

.feedback-explanation {
    font: var(--md-sys-typescale-body-medium);
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
    padding: 0 var(--spacing-md);
}

/* ============================================
   RESULTS SCREEN
   ============================================ */

#screen-results {
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
}

.score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.score-circle {
    position: relative;
    width: 160px;
    height: 160px;
}

.score-circle svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-circle .score-bg {
    fill: none;
    stroke: var(--md-sys-color-surface-variant);
    stroke-width: 12;
    stroke-linecap: round;
}

.score-circle .score-progress {
    fill: none;
    stroke: var(--md-sys-color-primary);
    stroke-width: 12;
    stroke-linecap: round;
    stroke-dasharray: 251.327;
    stroke-dashoffset: 251.327;
    transition: stroke-dashoffset 1s var(--md-sys-motion-spring-default);
}

.score-circle .score-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-value {
    font: var(--md-sys-typescale-display-medium);
    color: var(--md-sys-color-on-surface);
}

.score-total {
    font: var(--md-sys-typescale-body-large);
    color: var(--md-sys-color-on-surface-variant);
}

.score-label {
    font: var(--md-sys-typescale-headline-medium);
    color: var(--md-sys-color-on-surface);
    text-align: center;
}

.results-breakdown {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    background: var(--md-sys-color-surface-container);
    border-radius: var(--md-sys-shape-corner-extra-large);
    padding: var(--spacing-lg);
    width: 100%;
    max-width: 360px;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
}

.breakdown-label {
    font: var(--md-sys-typescale-title-medium);
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--md-sys-shape-corner-full);
    color: white;
}

.breakdown-item.gender-der .breakdown-label {
    background: var(--color-der);
}

.breakdown-item.gender-die .breakdown-label {
    background: var(--color-die);
}

.breakdown-item.gender-das .breakdown-label {
    background: var(--color-das);
}

.breakdown-value {
    font: var(--md-sys-typescale-body-large);
    color: var(--md-sys-color-on-surface);
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.action-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--md-sys-shape-corner-full);
    font: var(--md-sys-typescale-label-large);
    cursor: pointer;
    transition:
        transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-default),
        box-shadow var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard);
}

.action-button:active {
    transform: scale(0.95);
}

.action-button.primary {
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
}

.action-button.primary:hover {
    filter: brightness(1.1);
}

.action-button.secondary {
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
}

.action-button.secondary:hover {
    background: var(--md-sys-color-surface-container-highest);
}

.action-button .icon {
    font-size: 20px;
}

/* ============================================
   UTILITIES
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Hide scrollbar but keep functionality */
.screen::-webkit-scrollbar {
    display: none;
}

.screen {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* ============================================
   SPEED SLIDER (M3 Expressive)
   ============================================ */

.delay-slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--md-sys-color-surface-container);
    border-radius: var(--md-sys-shape-corner-full);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.delay-slider-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.delay-icon {
    font-size: 20px;
    color: var(--md-sys-color-primary);
    font-variation-settings:
        'FILL' 1,
        'wght' 500,
        'GRAD' 0,
        'opsz' 20;
}

.delay-label {
    font: var(--md-sys-typescale-label-large);
    color: var(--md-sys-color-on-surface-variant);
}

/* M3 Expressive Slider */
#delay-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 36px;
    background: transparent;
    cursor: pointer;
    margin: 0;
    padding: 0;
}

/* Track - uses gradient for active/inactive portions */
#delay-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 16px;
    background: var(--md-sys-color-primary-container);
    border-radius: var(--md-sys-shape-corner-full);
}

#delay-slider::-moz-range-track {
    width: 100%;
    height: 16px;
    background: var(--md-sys-color-primary-container);
    border-radius: var(--md-sys-shape-corner-full);
}

/* Firefox active track */
#delay-slider::-moz-range-progress {
    height: 16px;
    background: var(--md-sys-color-primary);
    border-radius: var(--md-sys-shape-corner-full);
}

/* Thumb - M3 expressive handle */
#delay-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 8px;
    height: 36px;
    background: var(--md-sys-color-on-primary-container);
    border-radius: var(--md-sys-shape-corner-full);
    border: none;
    margin-top: -10px;
    transition:
        width var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-bouncy),
        height var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-bouncy);
}

#delay-slider::-moz-range-thumb {
    width: 8px;
    height: 36px;
    background: var(--md-sys-color-on-primary-container);
    border-radius: var(--md-sys-shape-corner-full);
    border: none;
    transition:
        width var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-bouncy),
        height var(--md-sys-motion-duration-short3) var(--md-sys-motion-spring-bouncy);
}

/* Hover - thumb grows */
#delay-slider:hover::-webkit-slider-thumb {
    width: 10px;
    height: 40px;
}

#delay-slider:hover::-moz-range-thumb {
    width: 10px;
    height: 40px;
}

/* Active - thumb expands */
#delay-slider:active::-webkit-slider-thumb {
    width: 12px;
    height: 44px;
}

#delay-slider:active::-moz-range-thumb {
    width: 12px;
    height: 44px;
}

/* Focus state */
#delay-slider:focus {
    outline: none;
}

#delay-slider:focus-visible::-webkit-slider-thumb {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
}

#delay-slider:focus-visible::-moz-range-thumb {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
}