/* ============================================
   YouTube Downloader - Complete Styles
   ============================================ */

:root {
    /* Colors */
    --yt-red: #ff0000;
    --yt-red-hover: #cc0000;
    --yt-red-light: rgba(255, 0, 0, 0.1);
    
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #272727;
    --bg-card: #212121;
    --bg-hover: #3a3a3a;
    
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --text-muted: #717171;
    
    --border-color: #3a3a3a;
    --border-light: #4a4a4a;
    
    --success: #2ecc71;
    --error: #e74c3c;
    --warning: #f39c12;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body.rtl {
    font-family: 'Vazirmatn', 'Inter', sans-serif;
    direction: rtl;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
}

input, select {
    font-family: inherit;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--yt-red);
    color: white;
    padding: var(--space-sm) var(--space-md);
    z-index: 10000;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Page Loader
   ============================================ */
.page-loader {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.4s, visibility 0.4s;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--yt-red);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Navbar
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.navbar-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.1rem;
}

.navbar-brand-icon {
    font-size: 1.5rem;
    color: var(--yt-red);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background: var(--yt-red);
    color: white;
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-light);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: var(--space-sm);
}

.btn-link:hover {
    color: var(--text-primary);
}

/* Button Loading State */
.btn .btn-loading {
    display: none;
}

.btn.is-loading .btn-text {
    display: none;
}

.btn.is-loading .btn-loading {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ============================================
   Dropdown
   ============================================ */
.dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: '';
    border: 4px solid transparent;
    border-top-color: currentColor;
    margin-left: var(--space-xs);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.rtl .dropdown-menu {
    right: auto;
    left: 0;
}

.dropdown.show .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.6rem 1rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dropdown-item.active {
    color: var(--yt-red);
}

.dropdown-item.text-danger {
    color: var(--error);
}

.dropdown-flag {
    font-size: 1.1rem;
}

.dropdown-header {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--space-xs) 0;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px var(--space-md) var(--space-2xl);
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(255, 0, 0, 0.15) 0%, transparent 60%);
}

.hero-content {
    width: 100%;
    max-width: 600px;
    text-align: center;
}

.hero-icon {
    font-size: 4rem;
    color: var(--yt-red);
    margin-bottom: var(--space-md);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

/* ============================================
   Download Card
   ============================================ */
.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
}

/* Download Form */
.download-form {
    margin-bottom: 0;
}

.download-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

@media (min-width: 576px) {
    .download-input-group {
        flex-direction: row;
    }
}

.download-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.download-input-icon {
    position: absolute;
    left: var(--space-md);
    color: var(--text-muted);
    font-size: 1.25rem;
    pointer-events: none;
}

.rtl .download-input-icon {
    left: auto;
    right: var(--space-md);
}

.download-input {
    width: 100%;
    padding: 0.9rem 2.5rem 0.9rem 3rem;
    font-size: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.rtl .download-input {
    padding: 0.9rem 3rem 0.9rem 2.5rem;
}

.download-input:focus {
    outline: none;
    border-color: var(--yt-red);
    box-shadow: 0 0 0 3px var(--yt-red-light);
}

.download-input::placeholder {
    color: var(--text-muted);
}

.download-input.is-error {
    border-color: var(--error);
    animation: shake 0.4s ease;
}

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

.download-input-clear {
    position: absolute;
    right: var(--space-sm);
    background: none;
    border: none;
    color: var(--text-muted);
    padding: var(--space-sm);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.rtl .download-input-clear {
    right: auto;
    left: var(--space-sm);
}

.download-input-clear.is-visible {
    opacity: 1;
    visibility: visible;
}

.download-input-clear:hover {
    color: var(--text-primary);
}

.btn-download {
    flex-shrink: 0;
    padding: 0.9rem 1.5rem;
}

.btn-download .btn-label {
    display: none;
}

@media (min-width: 576px) {
    .btn-download .btn-label {
        display: inline;
    }
}

/* ============================================
   Status Message
   ============================================ */
.status-message {
    display: none;
    margin-top: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
}

.status-message.is-visible {
    display: block;
}

.status-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--yt-red);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.status-icon-success,
.status-icon-error {
    display: none;
    font-size: 1.25rem;
}

.status-message.is-loading .status-spinner {
    display: block;
}

.status-message.is-success .status-icon-success {
    display: block;
    color: var(--success);
}

.status-message.is-error .status-icon-error {
    display: block;
    color: var(--error);
}

.status-message.is-success {
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.status-message.is-error {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
}

.status-text {
    flex: 1;
    font-size: 0.9rem;
}

/* ============================================
   Video Preview
   ============================================ */
.video-preview {
    display: none;
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
}

.video-preview.is-visible {
    display: block;
}

.video-preview-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

@media (min-width: 480px) {
    .video-preview-inner {
        grid-template-columns: 180px 1fr;
    }
}

/* Thumbnail */
.video-thumbnail-wrapper {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-tertiary);
    aspect-ratio: 16 / 9;
}

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

.video-duration {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.rtl .video-duration {
    right: auto;
    left: var(--space-sm);
}

/* Video Info */
.video-info {
    display: flex;
    flex-direction: column;
}

.video-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.video-channel {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

/* Video Actions */
.video-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: auto;
}

@media (min-width: 400px) {
    .video-actions {
        flex-direction: row;
        align-items: flex-end;
    }
}

.quality-wrapper {
    flex: 1;
}

.quality-label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xs);
}

.quality-select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
}

.quality-select:focus {
    outline: none;
    border-color: var(--yt-red);
}

.btn-start-download {
    flex-shrink: 0;
}

/* Download Result */
.download-result {
    display: none;
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: var(--radius-md);
    text-align: center;
}

.download-result.is-visible {
    display: block;
}

.download-result-success {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--success);
    margin-bottom: var(--space-md);
}

.download-result-success i {
    font-size: 1.5rem;
}

.btn-save {
    margin-right: var(--space-sm);
}

.rtl .btn-save {
    margin-right: 0;
    margin-left: var(--space-sm);
}

/* Remaining Info */
.remaining-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-2xl) var(--space-md);
}

.section-features {
    background: var(--bg-secondary);
}

.section-steps {
    background: var(--bg-primary);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-xl);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-light);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    background: linear-gradient(135deg, var(--yt-red), var(--yt-red-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-lg);
}

.step-card {
    position: relative;
    text-align: center;
    padding: var(--space-xl) var(--space-md);
}

.step-number {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background: var(--yt-red);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.step-icon {
    font-size: 2.5rem;
    color: var(--yt-red);
    margin: var(--space-md) 0;
}

.step-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-xl) var(--space-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Modal
   ============================================ */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 2000;
}

.modal-backdrop.is-visible {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: calc(100% - 2rem);
    max-width: 420px;
    max-height: calc(100vh - 2rem);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 2001;
    overflow: hidden;
}

.modal.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-dialog {
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 2rem);
}

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.modal-icon {
    width: 48px;
    height: 48px;
    background: var(--yt-red-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--yt-red);
}

.modal-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.modal-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: var(--space-sm);
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-lg);
    overflow-y: auto;
}

.modal-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.modal-footer-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   Auth Steps
   ============================================ */
.auth-step {
    display: none;
}

.auth-step.is-active {
    display: block;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

.form-label.text-center {
    justify-content: center;
}

.form-input-wrapper {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    font-size: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.rtl .form-input {
    padding: 0.8rem 2.5rem 0.8rem 1rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--yt-red);
    box-shadow: 0 0 0 3px var(--yt-red-light);
}

.form-input.is-error {
    border-color: var(--error);
    animation: shake 0.4s ease;
}

.form-input-icon {
    position: absolute;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.rtl .form-input-icon {
    left: auto;
    right: 0.8rem;
}

.form-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

/* OTP Section */
.otp-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.otp-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    background: var(--yt-red-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--yt-red);
}

.otp-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.otp-email {
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}

/* OTP Inputs */
.otp-inputs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
}

.otp-input {
    width: 44px;
    height: 52px;
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.otp-input:focus {
    outline: none;
    border-color: var(--yt-red);
    box-shadow: 0 0 0 3px var(--yt-red-light);
}

.otp-input.is-filled {
    border-color: var(--yt-red);
    background: var(--yt-red-light);
}

.otp-input.is-error {
    border-color: var(--error);
    animation: shake 0.4s ease;
}

/* OTP Timer */
.otp-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    margin: var(--space-md) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.otp-timer.is-expired {
    color: var(--error);
}

/* OTP Actions */
.otp-actions {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-md);
}

/* Auth Alert */
.auth-alert {
    display: none;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: var(--radius-md);
    color: var(--error);
    font-size: 0.9rem;
}

.auth-alert.is-visible {
    display: flex;
}

/* ============================================
   Toast
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.rtl .toast-container {
    right: auto;
    left: var(--space-lg);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    min-width: 280px;
    max-width: 400px;
    padding: var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transform: translateX(120%);
    transition: transform var(--transition-normal);
}

.rtl .toast {
    transform: translateX(-120%);
}

.toast.is-visible {
    transform: translateX(0);
}

.toast-success {
    border-left: 4px solid var(--success);
}

.rtl .toast-success {
    border-left: none;
    border-right: 4px solid var(--success);
}

.toast-error {
    border-left: 4px solid var(--error);
}

.rtl .toast-error {
    border-left: none;
    border-right: 4px solid var(--error);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-success .toast-icon {
    color: var(--success);
}

.toast-error .toast-icon {
    color: var(--error);
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: var(--space-xs);
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 44px;
    height: 44px;
    background: var(--yt-red);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.rtl .back-to-top {
    right: auto;
    left: var(--space-lg);
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--yt-red-hover);
    transform: translateY(-3px);
}

/* ============================================
   Utility Classes
   ============================================ */
.d-none {
    display: none !important;
}

.d-sm-inline {
    display: none;
}

@media (min-width: 576px) {
    .d-sm-inline {
        display: inline;
    }
    
    .d-none.d-sm-inline {
        display: inline !important;
    }
}

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

.text-danger {
    color: var(--error) !important;
}

.w-100 {
    width: 100%;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 576px) {
    .hero {
        padding-top: 70px;
    }
    
    .hero-icon {
        font-size: 3rem;
    }
    
    .download-card {
        padding: var(--space-md);
    }
    
    .video-preview-inner {
        grid-template-columns: 1fr;
    }
    
    .video-thumbnail-wrapper {
        max-width: 200px;
        margin: 0 auto;
    }
    
    .video-info {
        text-align: center;
    }
    
    .video-actions {
        align-items: stretch;
    }
    
    .otp-input {
        width: 38px;
        height: 46px;
        font-size: 1.1rem;
    }
    
    .toast-container {
        left: var(--space-md);
        right: var(--space-md);
        bottom: var(--space-md);
    }
    
    .toast {
        min-width: auto;
        width: 100%;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .back-to-top,
    .toast-container,
    .modal,
    .modal-backdrop {
        display: none !important;
    }
}