/* ═══════════════ Design System Tokens ═══════════════ */
:root {
    /* Colors */
    --surface: #F4F2EE;
    --surface-lowest: #FAF9F7;
    --surface-dim: #E7E4DE;
    --primary: #2F5D8A;
    --primary-light: #E6EDF4;
    --primary-dark: #244A6D;
    --secondary: #4E7F63;
    --secondary-light: #E8F2EC;
    --secondary-dark: #3C624C;
    --accent: #C88A2A;
    --accent-light: #F6E9D2;
    --accent-dark: #A06E21;
    --on-surface: #222222;
    --on-surface-variant: #444444;
    --on-surface-strong: #111111;
    --inverse-text: #F0F0F0;

    /* Typography */
    --font: 'Atkinson Hyperlegible Next', sans-serif;

    /* Spacing (8dp grid) */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    --sp-8: 32px;
    --sp-10: 40px;
    --sp-12: 48px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 1.5rem;
    --radius-full: 50%;
}

/* ═══════════════ Reset & Base ═══════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    font-family: var(--font);
    font-size: 16px;
    color: var(--on-surface);
    background: var(--surface);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: none;
}

/* Material Symbols config */
.material-symbols-rounded {
    font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
    font-size: 24px;
    vertical-align: middle;
    user-select: none;
}

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

/* ═══════════════ App Container ═══════════════ */
.app {
    max-width: 430px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* ═══════════════ Screens ═══════════════ */
.screen {
    display: none;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: 120px;
}

.screen.active {
    display: flex;
}

/* ═══════════════ Header ═══════════════ */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    padding: 0 var(--sp-4);
    background: var(--surface);
    position: sticky;
    top: 0;
    z-index: 10;
    flex-shrink: 0;
}

.header-title {
    font-size: 1.0rem;
    font-weight: 600;
    color: var(--on-surface);
    letter-spacing: -0.01em;
}

.header-actions {
    display: flex;
    gap: var(--sp-2);
}

/* ═══════════════ Buttons ═══════════════ */
.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--on-surface-variant);
    padding: var(--sp-2);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.btn-icon:hover {
    background: rgba(34, 34, 34, 0.08);
}

.btn-icon:active {
    background: rgba(34, 34, 34, 0.12);
}

.btn-primary {
    background: var(--primary);
    color: var(--inverse-text);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--sp-3) var(--sp-6);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    transition: background 0.15s;
    flex: 2;
    justify-content: center;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-primary .material-symbols-rounded {
    font-size: 20px;
}

.btn-ghost {
    background: none;
    color: var(--primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--sp-3) var(--sp-4);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    transition: background 0.15s;
    flex: 1;
    justify-content: center;
}

.btn-ghost:hover {
    background: rgba(47, 93, 138, 0.08);
}

.btn-ghost .material-symbols-rounded {
    font-size: 20px;
}

/* ═══════════════ Search Overlay ═══════════════ */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface);
    z-index: 100;
    display: flex;
    flex-direction: column;
    max-width: 430px;
    margin: 0 auto;
}

.search-overlay.hidden {
    display: none;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-3) var(--sp-4);
    background: var(--surface-dim);
    margin: var(--sp-2) var(--sp-4);
    border-radius: var(--radius-md);
}

.search-bar input {
    flex: 1;
    border: none;
    background: none;
    font-family: var(--font);
    font-size: 1rem;
    color: var(--on-surface);
    outline: none;
}

.search-bar input::placeholder {
    color: var(--on-surface-variant);
}

.search-bar .material-symbols-rounded {
    color: var(--on-surface-variant);
}

.search-results {
    flex: 1;
    overflow-y: auto;
    padding: var(--sp-4);
}

.search-result-item {
    padding: var(--sp-3) var(--sp-4);
    margin-bottom: var(--sp-2);
    background: var(--surface-lowest);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.15s;
}

.search-result-item:hover {
    background: var(--surface-dim);
}

.search-result-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--on-surface);
}

.search-result-words {
    font-size: 0.75rem;
    color: var(--on-surface-variant);
    margin-top: var(--sp-1);
}

/* ═══════════════ Lesson Circles ═══════════════ */
.lesson-circles {
    display: flex;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-4);
    overflow-x: auto;
    scrollbar-width: none;
    background: var(--surface-lowest);
    flex-shrink: 0;
}

.lesson-circles::-webkit-scrollbar {
    display: none;
}

.circle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s;
}

.circle.available {
    background: var(--primary-light);
    color: var(--primary);
}

.circle.active {
    background: var(--primary);
    color: var(--inverse-text);
}

.circle.dimmed {
    background: var(--surface-dim);
    color: var(--on-surface-variant);
}

/* ═══════════════ Lesson Card ═══════════════ */
.card-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-4);
    overflow: hidden;
}

.lesson-card {
    width: 100%;
    height: 240px;
    background: var(--surface-lowest);
    border-radius: var(--radius-lg);
    padding: var(--sp-6);
    display: flex;
    flex-direction: column;
    user-select: none;
    overflow: hidden;
}

.lesson-card-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.card-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--on-surface-strong);
    letter-spacing: -0.01em;
}

.card-date {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
}

.card-words {
    font-size: 1rem;
    color: var(--on-surface);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
    margin-top: var(--sp-3);
}

.card-stats {
    display: flex;
    gap: var(--sp-4);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
    margin-top: var(--sp-2);
}

.card-stats span {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
}

.card-stats .material-symbols-rounded {
    font-size: 16px;
}

.card-actions {
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    width: 100%;
    margin-top: auto;
    padding-top: var(--sp-3);
}

.card-btn-circle {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.card-btn-circle:active {
    transform: scale(0.92);
}

.card-btn-circle.primary {
    background: var(--primary);
    color: var(--inverse-text);
}

.card-btn-circle.primary:active {
    background: var(--primary-dark);
}

.card-btn-circle .material-symbols-rounded {
    font-size: 22px;
}

.card-btn-circle.disabled {
    opacity: 0.3;
    pointer-events: none;
}

/* ═══════════════ Tabs ═══════════════ */
.tabs {
    display: flex;
    background: var(--surface-lowest);
    flex-shrink: 0;
}

.tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--sp-3) 0;
    border: none;
    background: none;
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--on-surface-variant);
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
}

.tab.active {
    color: var(--primary);
}

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

.tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20%;
    right: 20%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px 3px 0 0;
}

/* ═══════════════ Tab Content ═══════════════ */
.tab-content {
    display: none;
    flex: 1;
    position: relative;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

/* ═══════════════ Flashcard ═══════════════ */
.flashcard-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--sp-6) var(--sp-4);
    gap: var(--sp-6);
}

.view-toggle {
    position: absolute;
    top: var(--sp-3);
    right: var(--sp-4);
    z-index: 2;
}

.flashcard {
    width: 100%;
    max-width: 320px;
    height: 260px;
    perspective: 1000px;
    cursor: pointer;
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--surface-lowest);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-3);
    backface-visibility: hidden;
    transition: transform 0.5s;
    padding: var(--sp-6);
}

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

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

.flashcard.flipped .flashcard-back {
    transform: rotateY(0);
}

.flash-hebrew {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--on-surface-strong);
    text-align: center;
    line-height: 1.3;
}

.flash-hint {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
}

.flash-russian {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--on-surface);
    text-align: center;
}

.flash-full {
    font-size: 1rem;
    color: var(--on-surface-variant);
    text-align: center;
}

.btn-audio {
    position: absolute;
    bottom: var(--sp-4);
    right: var(--sp-4);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--accent);
    padding: var(--sp-2);
    border-radius: var(--radius-full);
    transition: background 0.15s;
}

.btn-audio:hover {
    background: var(--accent-light);
}

.swipe-hints {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 320px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    opacity: 0.4;
}

.hint-left {
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: var(--sp-1);
}

.hint-left .material-symbols-rounded {
    font-size: 18px;
}

.hint-right {
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: var(--sp-1);
}

.hint-right .material-symbols-rounded {
    font-size: 18px;
}

.flash-dots {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 280px;
}

.flash-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--surface-dim);
    transition: background 0.2s;
}

.flash-dot.active {
    background: var(--primary);
}

.flash-dot.known {
    background: var(--secondary);
}

.flash-progress {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
}

/* ═══════════════ Word List View ═══════════════ */
.list-view {
    padding: var(--sp-4);
}

.list-view.hidden {
    display: none !important;
}

.word-list {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
}

.word-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--sp-3) var(--sp-4);
    background: var(--surface-lowest);
    border-radius: var(--radius-md);
    gap: var(--sp-4);
}

.word-hebrew {
    font-size: 1rem;
    font-weight: 600;
    color: var(--on-surface-strong);
    text-align: right;
    direction: rtl;
    flex: 1;
}

.word-russian {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    flex: 1;
}

/* ═══════════════ Video ═══════════════ */
.video-blocks {
    padding: var(--sp-4);
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.video-block {
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.video-header {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: 1rem;
    font-weight: 500;
    color: var(--on-surface);
}

.video-header .material-symbols-rounded {
    color: var(--primary);
    font-size: 20px;
}

.video-size {
    margin-left: auto;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
}

.video-player {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--primary-light);
}

.video-player video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity 0.2s;
}

.video-overlay .material-symbols-rounded {
    font-size: 56px;
    color: var(--primary);
    opacity: 0.6;
}

.video-overlay:hover .material-symbols-rounded {
    opacity: 1;
}

.video-player.playing .video-overlay {
    opacity: 0;
    pointer-events: none;
}

.video-no-media {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-4);
    padding: var(--sp-12) var(--sp-6);
    color: var(--on-surface-variant);
    text-align: center;
}

.video-no-media.hidden {
    display: none;
}

.video-no-media .material-symbols-rounded {
    font-size: 48px;
    color: var(--primary-light);
}

/* ═══════════════ Voice Practice ═══════════════ */
.practice-voice {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-6);
    padding: var(--sp-8);
}

.voice-circle {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-full);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.voice-ring {
    position: absolute;
    inset: -12px;
    border-radius: var(--radius-full);
    border: 2px solid var(--primary-light);
    animation: none;
}

.voice-ring.ring-2 {
    inset: -24px;
    border-color: var(--primary-light);
    opacity: 0.5;
}

.voice-circle.active .voice-ring {
    animation: pulse-ring 2s ease-out infinite;
}

.voice-circle.active .voice-ring.ring-2 {
    animation: pulse-ring 2s ease-out infinite 0.3s;
}

@keyframes pulse-ring {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(1.3); opacity: 0; }
}

.voice-icon {
    color: var(--inverse-text);
}

.voice-bars {
    display: flex;
    gap: 4px;
    align-items: center;
    height: 40px;
}

.voice-bars span {
    width: 6px;
    border-radius: 3px;
    background: var(--inverse-text);
    height: 16px;
    transition: height 0.1s;
}

.voice-circle.active .voice-bars span {
    animation: bar-dance 0.8s ease-in-out infinite;
}

.voice-bars span:nth-child(1) { animation-delay: 0s; }
.voice-bars span:nth-child(2) { animation-delay: 0.2s; height: 24px; }
.voice-bars span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bar-dance {
    0%, 100% { height: 16px; }
    50% { height: 36px; }
}

.voice-status {
    font-size: 1.375rem;
    font-weight: 500;
    color: var(--on-surface);
}

.voice-timer {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
}

.voice-turns {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.turn {
    color: var(--surface-dim);
    padding: var(--sp-1) var(--sp-2);
}

.turn.active {
    color: var(--primary);
    background: var(--primary-light);
    border-radius: var(--radius-sm);
}

.turn-dot {
    color: var(--surface-dim);
}

.voice-controls {
    display: flex;
    gap: var(--sp-4);
}

.btn-voice-action {
    background: var(--primary);
    color: var(--inverse-text);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--sp-3) var(--sp-8);
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    transition: background 0.15s;
}

.btn-voice-action:hover {
    background: var(--primary-dark);
}

.btn-voice-secondary {
    background: var(--surface-dim);
    color: var(--on-surface);
    border: none;
    border-radius: var(--radius-full);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-voice-secondary.hidden {
    display: none;
}

.btn-voice-secondary:hover {
    background: var(--primary-light);
}

.voice-note {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.voice-note.visible {
    opacity: 1;
}

/* ═══════════════ Gemini Practice ═══════════════ */
.practice-gemini {
    display: flex;
    flex-direction: column;
    gap: var(--sp-5);
    padding: var(--sp-6);
}

.gemini-header {
    text-align: center;
}

.gemini-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #4285f4, #ea4335, #fbbc04, #34a853);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gemini-header h3 {
    margin: var(--sp-2) 0;
    font-size: 1.25rem;
    color: var(--on-surface);
}

.gemini-desc {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    line-height: 1.5;
}

.gemini-prompt-preview {
    background: var(--surface);
    border: 1px solid var(--surface-dim);
    border-radius: var(--radius-lg);
    padding: var(--sp-4);
    max-height: 200px;
    overflow-y: auto;
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--on-surface-variant);
    white-space: pre-wrap;
    font-family: 'Roboto Mono', monospace;
}

.prompt-loading {
    text-align: center;
    color: var(--on-surface-variant);
    padding: var(--sp-4);
}

.gemini-actions {
    display: flex;
    gap: var(--sp-3);
    justify-content: center;
}

.gemini-copy-btn {
    font-size: 1rem;
    padding: var(--sp-3) var(--sp-6);
    display: flex;
    align-items: center;
    gap: var(--sp-2);
}

.gemini-open-btn {
    background: var(--surface-dim);
    color: var(--on-surface);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--sp-3) var(--sp-5);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    text-decoration: none;
    transition: background 0.15s;
}

.gemini-open-btn:hover {
    background: var(--primary-light);
}

.gemini-steps {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    padding: var(--sp-4);
    background: var(--surface);
    border-radius: var(--radius-lg);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: 0.875rem;
    color: var(--on-surface-variant);
}

.step-num {
    width: 24px;
    height: 24px;
    background: var(--primary);
    color: var(--inverse-text);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* ═══════════════ Progress Screen ═══════════════ */
.progress-content {
    padding: var(--sp-6);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-4);
}

.stat-card {
    background: var(--surface-lowest);
    border-radius: var(--radius-lg);
    padding: var(--sp-6) var(--sp-4);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-2);
    text-align: center;
}

.stat-icon {
    color: var(--primary);
    font-size: 32px;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--on-surface-strong);
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    letter-spacing: 0.05em;
}

/* ═══════════════ Settings Screen ═══════════════ */
.settings-content {
    padding: var(--sp-6);
    display: flex;
    flex-direction: column;
    gap: var(--sp-4);
}

.setting-item {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-4);
    background: var(--surface-lowest);
    border-radius: var(--radius-md);
}

.setting-item .material-symbols-rounded {
    color: var(--primary);
    font-size: 20px;
}

.setting-item span:nth-child(2) {
    flex: 1;
    font-size: 0.875rem;
    font-weight: 500;
}

.setting-item select {
    background: var(--surface-dim);
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--sp-2) var(--sp-3);
    font-family: var(--font);
    font-size: 0.875rem;
    color: var(--on-surface);
    cursor: pointer;
}

.setting-info {
    padding: var(--sp-4);
    font-size: 0.75rem;
    color: var(--on-surface-variant);
    line-height: 1.8;
}

/* ═══════════════ Bottom Navigation ═══════════════ */
.bottom-nav {
    display: flex;
    background: var(--surface-lowest);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 430px;
    margin: 0 auto;
    z-index: 20;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--sp-3) 0;
    border: none;
    background: none;
    font-family: var(--font);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--on-surface-variant);
    cursor: pointer;
    transition: color 0.2s;
}

.nav-item.active {
    color: var(--primary);
}

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

/* ═══════════════ Mini Audio Player ═══════════════ */
.mini-player {
    position: fixed;
    bottom: 56px;
    left: 0;
    right: 0;
    max-width: 430px;
    margin: 0 auto;
    background: var(--surface-lowest);
    padding: var(--sp-3) var(--sp-4);
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    z-index: 19;
}

.mini-player.hidden {
    display: none;
}

.mini-player-info {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--on-surface);
    cursor: pointer;
}

.mini-player-info .material-symbols-rounded {
    color: var(--primary);
    font-size: 20px;
}

.mini-player-controls {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.mini-progress {
    flex: 1;
    height: 4px;
    background: rgba(47, 93, 138, 0.2);
    border-radius: 2px;
    overflow: hidden;
}

.mini-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s linear;
}

.mini-time {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--on-surface-variant);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
    min-width: 72px;
}

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

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

.btn-ghost:disabled, .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-ghost.downloading {
    color: var(--accent);
}

/* ═══════════════ Utilities ═══════════════ */
.hidden {
    display: none !important;
}

/* Safe area bottom padding for bottom nav screens */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .bottom-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
}