/* CSS Variables for Modern Theme */
:root {
    --bg-color: #f5f7fa;
    --text-color: #1a1a2e;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --panel-bg: #ffffff;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --success-color: #10b981;

    --sidebar-width: 260px;
    --sidebar-bg: #1e1e2d;
    --sidebar-text: #a1a1aa;
    --sidebar-active: #ffffff;
    --sidebar-hover-bg: rgba(255, 255, 255, 0.1);

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: var(--spacing-xs);
}

.sidebar-tagline {
    font-size: 0.75rem;
    color: var(--sidebar-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-close {
    display: none;
    position: absolute;
    top: 20px;
    right: 16px;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
}

.nav-menu {
    list-style: none;
    padding: var(--spacing-md) 0;
    flex: 1;
}

.nav-item {
    margin: 4px var(--spacing-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-link:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-active);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.nav-icon {
    font-size: 1.25rem;
}

.nav-text {
    font-size: 0.95rem;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.sidebar-footer p {
    font-size: 0.75rem;
    color: var(--sidebar-text);
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    /* Fix: Allow clicks to pass through when hidden */
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
    pointer-events: auto;
    /* Fix: Block clicks when visible */
}

/* ===== MAIN WRAPPER ===== */
.main-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page-header {
    background: var(--panel-bg);
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-content {
    flex: 1;
}

/* Hamburger Button */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    border-radius: var(--border-radius-sm);
    transition: background 0.2s;
}

.hamburger-btn:hover {
    background: rgba(0, 0, 0, 0.05);
}

.hamburger-btn span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger-btn span:nth-child(2) {
    margin: 5px 0;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.page-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
}

/* ===== CONTENT CARDS ===== */
.content-card {
    background: var(--panel-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    max-width: 1200px;
    /* Increased from 900px */
    width: 100%;
    /* Ensure it tries to take full width */
    margin: 0 auto;
    /* Center it */
}

/* ... existing code ... */

/* ===== TUTORIAL PAGE ===== */
.tutorial-grid {
    display: grid;
    /* Changed auto-fill to auto-fit to collapse empty tracks */
    /* Increased min-width to 180px for better visibility */
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
}

/* ===== VIDEO CONTAINER ===== */
.video-container {
    margin-bottom: var(--spacing-lg);
}

.video-placeholder {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: var(--border-radius);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border: 2px dashed var(--border-color);
}

.placeholder-content {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder-content .icon {
    display: block;
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.7;
}

.placeholder-content p {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.placeholder-content .hint {
    font-size: 0.85rem;
    opacity: 0.7;
}

.hidden {
    display: none !important;
}

#webcam-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius);
}

/* ===== CONTROLS SECTION ===== */
.controls-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.output-group,
.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.output-group label,
.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
}

input[type="text"],
textarea {
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    font-family: var(--font-family);
    font-size: 1rem;
    background: #ffffff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"] {
    height: 52px;
}

textarea {
    height: 100px;
    resize: none;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* ===== BUTTONS ===== */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

/* Voice Input Section */
.voice-input-section {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-top: var(--spacing-sm);
}

.voice-input-section select {
    flex: 0 0 auto;
}

.btn.recording {
    background: linear-gradient(135deg, #ef4444, #dc2626) !important;
    animation: pulse-recording 1s infinite;
}

@keyframes pulse-recording {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
    }

    50% {
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

.btn.large {
    flex: 1;
    padding: 16px 24px;
    font-size: 1rem;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn.primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn.secondary {
    background: #ffffff;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn.secondary:hover {
    background: #f8fafc;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn.danger {
    background: var(--danger-color);
    color: #ffffff;
}

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

.btn.warning {
    background: var(--warning-color);
    color: #ffffff;
}

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

.btn-icon {
    font-size: 1.1rem;
}

/* ===== INPUT SECTION ===== */
.input-section {
    margin-bottom: var(--spacing-lg);
}

/* ===== HISTORY PAGE ===== */
.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.history-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.history-list {
    max-height: 500px;
    overflow-y: auto;
}

.history-item {
    padding: var(--spacing-md);
    background: #f8fafc;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-sm);
    border-left: 4px solid var(--success-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.history-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.history-number {
    display: inline-block;
    background: var(--primary-color);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 12px;
    margin-right: var(--spacing-sm);
}

.history-text {
    color: var(--text-color);
    font-size: 1rem;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===== RESPONSIVE - TABLET ===== */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }

    .page-content {
        padding: var(--spacing-md);
    }

    .page-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

/* ===== RESPONSIVE - MOBILE ===== */
@media (max-width: 768px) {

    /* Sidebar becomes off-canvas */
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .sidebar-overlay {
        display: block;
    }

    .sidebar-overlay.active {
        display: block;
    }

    /* Main content takes full width */
    .main-wrapper {
        margin-left: 0;
    }

    /* Show hamburger button */
    .hamburger-btn {
        display: flex;
    }

    /* Page header adjustments */
    .page-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .page-title {
        font-size: 1.25rem;
    }

    .page-subtitle {
        font-size: 0.85rem;
    }

    /* Page content */
    .page-content {
        padding: var(--spacing-md);
    }

    /* Content card */
    .content-card {
        padding: var(--spacing-md);
    }

    /* Buttons stack on mobile */
    .primary-actions {
        flex-direction: column;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn.large {
        width: 100%;
    }

    /* Video placeholder */
    .video-placeholder {
        aspect-ratio: 4 / 3;
    }

    .placeholder-content .icon {
        font-size: 2rem;
    }

    .placeholder-content p {
        font-size: 0.95rem;
    }
}

/* ===== RESPONSIVE - SMALL MOBILE ===== */
@media (max-width: 480px) {
    .sidebar-logo {
        font-size: 1.25rem;
    }

    .page-title {
        font-size: 1.1rem;
    }

    .page-subtitle {
        display: none;
    }

    .content-card {
        padding: var(--spacing-sm);
    }

    .btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    .btn.large {
        padding: 14px 20px;
    }

    input[type="text"] {
        height: 48px;
    }

    textarea {
        height: 80px;
    }

    .history-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===== UTILITY: SMOOTH SCROLL ===== */
html {
    scroll-behavior: smooth;
}

/* ===== UTILITY: SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}


/* ===== TUTORIAL PAGE ===== */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
}

.tutorial-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tutorial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.tutorial-card .image-wrapper {
    width: 100%;
    aspect-ratio: 1;
    /* Square images */
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
}

.tutorial-card img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius-sm);
}

.tutorial-card .letter-label {
    width: 100%;
    padding: var(--spacing-sm);
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    background: #ffffff;
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--border-color);
}

/* Video Cards */
.video-card {
    cursor: pointer;
}

.video-thumbnail {
    position: relative;
    background: #000;
}

.video-thumbnail video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.video-card:hover .video-thumbnail video {
    opacity: 0.6;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 2rem;
    opacity: 0.8;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    transition: transform 0.2s;
}

.video-card:hover .play-icon {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 1;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background-color: #fefefe;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 800px;
    padding: var(--spacing-md);
    position: relative;
    box-shadow: var(--shadow-lg);
}

.close-modal {
    position: absolute;
    right: 15px;
    top: 10px;
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    z-index: 10;
}

.close-modal:hover {
    color: var(--text-color);
}

#modalTitle {
    margin-bottom: var(--spacing-md);
    padding-right: 30px;
    color: var(--text-color);
}

.modal-video-container {
    width: 100%;
    position: relative;
    padding-top: 56.25%;
    /* 16:9 Aspect Ratio */
    background: #000;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.modal-video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ===== ISL KEYBOARD PAGE ===== */
.isl-keyboard-section {
    margin-bottom: var(--spacing-lg);
}

.section-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.isl-keyboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.isl-key-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xs);
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    aspect-ratio: 1;
}

.isl-key-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.25);
}

.isl-key-btn:active,
.isl-key-btn.key-pressed {
    transform: scale(0.95);
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    border-color: var(--primary-color);
}

.isl-key-btn.key-pressed .key-label {
    color: #ffffff;
}

.isl-key-btn img {
    width: 100%;
    height: 70%;
    object-fit: contain;
    border-radius: var(--border-radius-sm);
}

.key-label {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-top: var(--spacing-xs);
}

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

.special-keys .btn {
    min-width: 140px;
}

/* ISL Keyboard Responsive */
@media (max-width: 768px) {
    .isl-keyboard-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        gap: var(--spacing-xs);
    }

    .key-label {
        font-size: 1rem;
    }

    .special-keys {
        flex-direction: column;
    }

    .special-keys .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .isl-keyboard-grid {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    }

    .key-label {
        font-size: 0.85rem;
    }

    .isl-key-btn {
        padding: 4px;
    }
}