/* ==========================================================================
   Project SAM - Landing Page Stylesheet
   Design System: Modern Tech & Industrial Realism Dark Mode
   ========================================================================== */

/* 1. CSS Custom Properties / Design Tokens */
:root {
    --bg-dark: #0F172A;
    --bg-surface: #1E293B;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-card-hover: rgba(51, 65, 85, 0.8);
    
    --primary: #F97316;
    --primary-hover: #EA580C;
    --primary-glow: rgba(249, 115, 22, 0.3);
    
    --secondary: #10B981;
    --secondary-hover: #059669;
    --secondary-glow: rgba(16, 185, 129, 0.35);

    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --border-highlight: rgba(249, 115, 22, 0.4);

    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(249, 115, 22, 0.25);

    --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. Global Resets & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden !important;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden !important;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

section, footer, main {
    position: relative;
    width: 100% !important;
    max-width: 100% !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

header, nav {
    position: relative;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
    font-weight: 700;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

img {
    max-width: 100%;
    display: block;
}

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-center { text-align: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* Gradient Text & Pulse */
.gradient-text {
    background: linear-gradient(135deg, #F97316 0%, #FBBF24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: #22C55E;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 12px #22C55E;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

/* 3. Buttons & Controls */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    padding: 12px 24px;
    font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #EA580C 100%);
    color: #FFFFFF;
    box-shadow: var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-secondary {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    color: #FFFFFF;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.35);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.5);
    filter: brightness(1.15);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* 4. Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    text-decoration: none;
}

.logo-img {
    height: 58px;
    width: 58px;
    border-radius: 50%;
    object-fit: cover;
    background: #FFFFFF;
    padding: 2px;
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.logo:hover .logo-img {
    transform: scale(1.04);
    box-shadow: none;
}

.logo-text-group {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.logo-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.logo-subtitle {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 5. Hero Section */
.hero-section {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(249, 115, 22, 0.15) 0%, rgba(14, 165, 233, 0.05) 50%, transparent 70%);
    filter: blur(80px);
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: stretch;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(249, 115, 22, 0.1);
    border: 1px solid rgba(249, 115, 22, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 24px;
    max-width: 100%;
    white-space: normal;
    word-break: break-word;
    box-sizing: border-box;
}

.hero-title {
    font-size: 3.2rem;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(12px);
}

.stat-card {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    font-family: var(--font-heading);
    line-height: 1;
}

.stat-plus {
    font-size: 1.2rem;
    color: var(--primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

/* Hero Card Preview */
.hero-card-preview {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.hero-card-preview:hover {
    border-color: var(--border-highlight);
    transform: translateY(-4px);
}

.preview-badge {
    position: absolute;
    top: 28px;
    left: 28px;
    z-index: 10;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    color: #FBBF24;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(251, 191, 36, 0.3);
}

.preview-img-wrapper {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.hero-card-preview:hover .preview-img {
    transform: scale(1.05);
}

.play-btn-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    color: #FFF;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px var(--primary-glow);
    transition: var(--transition);
}

.play-btn-overlay:hover {
    transform: translate(-50%, -50%) scale(1.15);
    background: var(--primary-hover);
}

.preview-info {
    padding: 16px 8px 8px;
}

.preview-info h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.preview-info p {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

/* 6. Section Headers */
.section-header {
    margin-bottom: 48px;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* 7. Categories Section */
.categories-section {
    padding: 80px 0;
    background: rgba(15, 23, 42, 0.5);
    border-top: 1px solid var(--border-color);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.category-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--secondary);
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.category-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
    display: inline-block;
}

.category-title {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.category-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.category-count {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 8. Featured Videos Section */
.videos-section {
    padding: 100px 0;
}

.video-filters {
    display: flex;
    gap: 8px;
    background: var(--bg-card);
    padding: 6px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    box-sizing: border-box;
}

.filter-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn.active, .filter-btn:hover {
    background: var(--primary);
    color: #FFF;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    border-color: var(--border-highlight);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .thumb-img {
    transform: scale(1.08);
}

.video-duration {
    position: absolute;
    bottom: 12px;
    right: 12px;
    background: rgba(15, 23, 42, 0.85);
    color: #FFF;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(249, 115, 22, 0.9);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.video-card:hover .play-overlay {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-body {
    padding: 20px;
}

.video-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.tag {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
}

.tag-orange {
    background: rgba(249, 115, 22, 0.15);
    color: var(--primary);
}

.tag-blue {
    background: rgba(14, 165, 233, 0.15);
    color: var(--secondary);
}

.video-title {
    font-size: 1.05rem;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-snippet {
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 9. Philosophy Section */
.philosophy-section {
    padding: 100px 0;
    background: rgba(15, 23, 42, 0.4);
    border-top: 1px solid var(--border-color);
}

.philosophy-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.features-list {
    margin-top: 36px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-icon {
    font-size: 1.8rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    line-height: 1;
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.feature-item p {
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    backdrop-filter: blur(16px);
    position: relative;
}

.quote-card {
    border-color: var(--border-highlight);
    box-shadow: var(--shadow-glow);
}

.quote-icon {
    font-size: 4rem;
    color: var(--primary);
    line-height: 1;
    font-family: Georgia, serif;
    opacity: 0.5;
}

.quote-text {
    font-size: 1.15rem;
    font-style: italic;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.author-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
}

.author-name {
    font-weight: 700;
    font-size: 1rem;
}

.author-role {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* 10. Knowledge Base Section */
.kb-section {
    padding: 100px 0;
}

.kb-wrapper {
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.9) 100%);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 56px 40px;
    box-shadow: 0 0 50px rgba(249, 115, 22, 0.15);
}

.kb-search-box {
    display: flex;
    gap: 12px;
    max-width: 760px;
    margin: 32px auto 20px;
}

.kb-input {
    flex: 1;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-body);
    outline: none;
    transition: var(--transition);
}

.kb-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.kb-quick-tags {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 32px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.kb-quick-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.kb-quick-btn:hover {
    background: rgba(14, 165, 233, 0.15);
    color: var(--secondary);
    border-color: var(--secondary);
}

.kb-results-container {
    max-width: 760px;
    margin: 0 auto;
    min-height: 120px;
}

.kb-placeholder {
    text-align: center;
    padding: 32px;
    color: var(--text-muted);
    background: rgba(15, 23, 42, 0.4);
    border-radius: var(--radius-md);
    border: 1px stroke var(--border-color);
}

.kb-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.kb-result-card {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.kb-result-title {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 6px;
}

.kb-result-text {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.kb-result-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 11. CTA Section */
.cta-section {
    padding: 100px 0;
    background: radial-gradient(circle at center, rgba(249, 115, 22, 0.15) 0%, rgba(15, 23, 42, 1) 70%);
}

.cta-title {
    font-size: 2.4rem;
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 36px;
}

/* 12. Footer */
.footer {
    background: #090D16;
    border-top: 1px solid var(--border-color);
    padding: 64px 0 24px;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 0.8fr 1.2fr 1.2fr;
    gap: 36px;
    margin-bottom: 48px;
}

.footer-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 16px;
    max-width: 320px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-family: var(--font-heading);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-social-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.social-link-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.social-link-item:hover {
    background: rgba(249, 115, 22, 0.1);
    border-color: var(--primary);
    transform: translateX(4px);
}

.social-icon {
    width: 30px;
    height: 30px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.youtube-icon { background: rgba(239, 68, 68, 0.2); color: #EF4444; }
.rutube-icon { background: rgba(37, 99, 235, 0.2); color: #3B82F6; }
.dzen-icon { background: rgba(245, 158, 11, 0.2); color: #F59E0B; }
.vk-icon { background: rgba(0, 119, 255, 0.2); color: #0077FF; }
.tg-icon { background: rgba(42, 171, 238, 0.2); color: #2AABEE; }
.max-icon { background: rgba(168, 85, 247, 0.2); color: #A855F7; }

.social-name {
    font-weight: 700;
    font-size: 0.78rem;
    color: var(--text-primary);
    line-height: 1.1;
}

.social-handle {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 13. Modal Player */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    z-index: 10;
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 25px 50px rgba(0,0,0,0.5);
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: #FFF;
    font-size: 2.5rem;
    cursor: pointer;
    line-height: 1;
}

.modal-video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
}

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

/* Inline Hero AI Chat Component */
.kalk-fab, .kalk-panel {
    display: none !important;
}

.hero-visual {
    height: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.hero-chat-card {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.98) 100%);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: blur(16px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 40px rgba(249, 115, 22, 0.15);
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 100%;
    min-height: 0;
    overflow: hidden;
    position: relative;
    box-sizing: border-box;
}

.hero-chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: nowrap !important;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 14px;
    flex: none;
}

.hero-chat-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ai-badge {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: #22C55E;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0 !important;
    white-space: nowrap !important;
}
    gap: 6px;
}

.hero-chat-messages {
    flex: 1 1 auto;
    height: 0;
    min-height: 0;
    overflow-y: auto;
    padding-right: 6px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 12px;
    scroll-behavior: smooth;
}

.hero-chat-messages::-webkit-scrollbar {
    width: 4px;
}
.hero-chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.hero-chat-msg {
    max-width: 92%;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    font-size: 0.86rem;
    line-height: 1.5;
    animation: fadeIn 0.3s ease;
}

.hero-chat-msg.bot {
    align-self: flex-start;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-top-left-radius: 4px;
}

.hero-chat-msg.bot strong {
    color: var(--primary);
    font-weight: 700;
}

.hero-chat-msg small, .kalk-m small {
    font-size: 0.78rem;
    opacity: 0.65;
    color: var(--text-secondary);
    display: inline-block;
    line-height: 1.35;
}

.hero-chat-msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--primary) 0%, #EA580C 100%);
    color: #FFFFFF;
    border-top-right-radius: 4px;
    font-weight: 500;
}

.hero-chat-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.hero-chip-btn {
    background: rgba(249, 115, 22, 0.15);
    border: 1px solid rgba(249, 115, 22, 0.3);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.hero-chip-btn:hover {
    background: var(--primary);
    color: #FFF;
}

.hero-chat-form {
    display: flex;
    gap: 10px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    flex: none;
}

.hero-chat-input {
    flex: 1;
    background: rgba(15, 23, 42, 0.95);
    border: 1.5px solid rgba(249, 115, 22, 0.4);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    color: #FFFFFF;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-body);
    outline: none;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-chat-input::placeholder {
    color: rgba(255, 255, 255, 0.45);
    font-size: 0.92rem;
    font-weight: 400;
}

.hero-chat-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow), inset 0 2px 4px rgba(0, 0, 0, 0.3);
    background: #0F172A;
}

/* 14. Responsive Breakpoints */
/* ============================================================
   14. Responsive Breakpoints — FULL MOBILE ADAPTATION
   ============================================================ */

@media (max-width: 1024px) {
    .hero-container, .philosophy-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .footer-container {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    /* FIX #4: Hide decorative glow already at tablet widths */
    .hero-bg-glow {
        display: none !important;
    }
}

@media (max-width: 768px) {
    /* ---- Global overflow lock ---- */
    html, body {
        width: 100% !important;
        max-width: 100vw !important;
        overflow-x: hidden !important;
        position: relative;
    }



    .container {
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 16px !important;
        box-sizing: border-box !important;
    }

    /* ---- Header ---- */
    .header {
        position: fixed;
    }

    .nav-menu {
        display: none;
    }

    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        border-bottom: 1px solid var(--border-color);
        padding: 20px 24px;
        gap: 16px;
        box-shadow: 0 20px 30px rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(16px);
        animation: fadeIn 0.3s ease;
    }

    .mobile-toggle {
        display: flex;
    }

    /* FIX #3: Hide header action buttons on mobile — only burger visible */
    .header-actions .btn {
        display: none !important;
    }
    .header-actions .mobile-toggle {
        display: flex !important;
    }

    /* ---- Hero Section ---- */
    .hero-section {
        padding: 100px 0 50px;
    }

    .hero-title {
        font-size: clamp(1.5rem, 5.5vw, 1.95rem);
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .hero-badge {
        font-size: 0.78rem !important;
        padding: 5px 12px !important;
        max-width: 100% !important;
        white-space: normal !important;
        word-break: break-word !important;
        line-height: 1.35 !important;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
        padding: 14px 20px !important;
        font-size: 0.95rem !important;
    }

    /* ---- Grid columns collapse to 1fr ---- */
    .hero-container, 
    .philosophy-grid,
    .categories-grid,
    .videos-grid,
    .footer-container {
        grid-template-columns: 1fr !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        gap: 20px;
    }

    /* ---- Hero Chat Card ---- */
    .hero-visual,
    .hero-chat-card,
    .hero-chat-form,
    .hero-chat-messages,
    .hero-chat-msg {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .hero-chat-card {
        height: 460px !important;
        max-height: 460px !important;
        min-height: 460px !important;
        padding: 14px !important;
    }

    .hero-stats {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .stat-divider {
        width: 100%;
        height: 1px;
    }

    /* FIX #1: Stack video section header (title + filters) vertically */
    .section-header.flex-between,
    .flex-between {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 16px !important;
    }

    .video-filters {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding: 6px;
        -webkit-overflow-scrolling: touch;
    }

    .filter-btn {
        white-space: nowrap;
        flex-shrink: 0;
        padding: 6px 12px;
        font-size: 0.82rem;
    }

    .hero-chip-btn {
        white-space: normal !important;
        word-break: break-word !important;
        max-width: 100% !important;
    }

    /* FIX #2: Reduce kb-wrapper padding on mobile */
    .kb-wrapper {
        padding: 32px 16px !important;
        box-sizing: border-box !important;
    }

    .kb-search-box {
        flex-direction: column;
    }

    .kb-input {
        padding: 12px 14px !important;
        font-size: 0.92rem !important;
    }

    .kb-quick-tags {
        gap: 6px;
    }

    /* FIX #5: Reduce glass-card / quote-card padding */
    .glass-card {
        padding: 24px 16px !important;
    }

    .quote-text {
        font-size: 1rem;
    }

    /* ---- Section titles ---- */
    .section-title {
        font-size: clamp(1.35rem, 5vw, 1.7rem) !important;
        word-break: break-word !important;
        overflow-wrap: break-word !important;
    }

    .section-subtitle {
        font-size: 0.92rem !important;
    }

    .cta-title {
        font-size: clamp(1.4rem, 5vw, 1.8rem) !important;
        word-break: break-word !important;
    }

    .cta-desc {
        font-size: 0.95rem !important;
    }

    /* FIX #6: Truncate long URLs in social handles */
    .social-handle {
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        white-space: nowrap !important;
        max-width: 180px !important;
    }

    .social-link-item {
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    /* ---- Category & Video cards ---- */
    .category-card {
        padding: 20px !important;
    }

    .video-body {
        padding: 14px !important;
    }

    /* ---- Button sizes ---- */
    .btn-lg {
        padding: 14px 20px !important;
        font-size: 0.95rem !important;
    }

    .videos-section,
    .philosophy-section,
    .kb-section,
    .cta-section {
        padding: 60px 0 !important;
    }

    .categories-section {
        padding: 50px 0 !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px !important;
    }

    .logo-img {
        width: 38px !important;
        height: 38px !important;
    }

    .logo-title {
        font-size: 1rem !important;
    }

    .logo-subtitle {
        font-size: 0.6rem !important;
    }

    .hero-section {
        padding: 90px 0 40px !important;
    }

    .hero-title {
        font-size: clamp(1.2rem, 5vw, 1.5rem) !important;
        line-height: 1.25 !important;
    }

    .hero-description {
        font-size: 0.88rem !important;
    }

    .hero-badge {
        font-size: 0.7rem !important;
        padding: 4px 8px !important;
    }

    .cta-title {
        font-size: clamp(1.2rem, 5vw, 1.45rem) !important;
    }

    .hero-chat-card {
        padding: 10px !important;
        height: 420px !important;
        max-height: 420px !important;
        min-height: 420px !important;
    }

    .hero-chat-title {
        font-size: 0.85rem !important;
    }

    .ai-badge {
        font-size: 0.72rem !important;
        padding: 3px 8px !important;
    }

    .hero-chat-msg {
        font-size: 0.8rem !important;
        padding: 10px 12px !important;
    }

    .hero-chat-input {
        padding: 10px 12px !important;
        font-size: 0.85rem !important;
    }

    #heroChatSendBtn {
        padding: 10px 12px !important;
        font-size: 0.82rem !important;
    }

    .hero-chip-btn {
        font-size: 0.68rem !important;
        padding: 3px 8px !important;
    }

    .social-link-item {
        padding: 6px 8px;
    }

    .social-handle {
        max-width: 140px !important;
    }

    .modal-content {
        width: 98%;
    }

    .section-title {
        font-size: clamp(1.15rem, 4.5vw, 1.4rem) !important;
    }

    .category-card {
        padding: 16px !important;
    }

    .category-title {
        font-size: 1.05rem !important;
    }

    .category-desc {
        font-size: 0.85rem !important;
    }

    .glass-card {
        padding: 18px 12px !important;
    }

    .kb-wrapper {
        padding: 24px 10px !important;
    }

    .kb-quick-btn {
        font-size: 0.72rem !important;
        padding: 3px 8px !important;
    }

    .btn-lg {
        padding: 12px 16px !important;
        font-size: 0.88rem !important;
    }

    .footer {
        padding: 40px 0 16px !important;
    }

    .footer-text {
        font-size: 0.82rem !important;
    }

    .footer-col h4 {
        font-size: 0.9rem !important;
        margin-bottom: 12px !important;
    }

    .footer-links a {
        font-size: 0.82rem !important;
    }
}