/* ===== CSS VARIABLES — LIGHT MODE (DEFAULT) ===== */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #6366f1;
    --secondary: #0891b2;
    --accent: #d97706;
    --success: #059669;
    --danger: #dc2626;

    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --bg-surface: #e2e8f0;

    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-white: #0f172a;

    --border: rgba(99, 102, 241, 0.15);
    --border-hover: rgba(99, 102, 241, 0.3);

    --gradient-primary: linear-gradient(135deg, #4f46e5, #0891b2);
    --gradient-hero: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #dbeafe 100%);
    --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(6,182,212,0.03));

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.06);
    --shadow-glow: 0 0 25px rgba(79,70,229,0.12);

    --nav-bg: rgba(248, 250, 252, 0.85);
    --nav-bg-scrolled: rgba(248, 250, 252, 0.95);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --nav-height: 72px;
    --container-width: 1200px;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;

    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1a2744;
    --bg-surface: #0a0a1a;

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-white: #ffffff;

    --border: rgba(99, 102, 241, 0.15);
    --border-hover: rgba(99, 102, 241, 0.3);

    --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
    --gradient-hero: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    --gradient-card: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(6,182,212,0.05));

    --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);
    --shadow-glow: 0 0 30px rgba(99,102,241,0.2);

    --nav-bg: rgba(15, 15, 35, 0.85);
    --nav-bg-scrolled: rgba(15, 15, 35, 0.95);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--primary);
    color: var(--text-white);
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--secondary);
}

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: all 0.3s;
}

.navbar.scrolled {
    background: var(--nav-bg-scrolled);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    overflow: hidden;
}

.nav-logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.5px;
}

.logo-sub {
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 400;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all 0.3s;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-white);
    background: rgba(99, 102, 241, 0.1);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: calc(var(--nav-height) + 40px) 24px 60px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: var(--gradient-hero);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(79, 70, 229, 0.1);
    border: 1px solid rgba(79, 70, 229, 0.25);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease;
}

[data-theme="dark"] .hero-badge {
    background: rgba(99, 102, 241, 0.12);
    border-color: rgba(99, 102, 241, 0.25);
    color: #818cf8;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--text-white);
    margin-bottom: 20px;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 36px;
    animation: fadeInUp 0.6s ease 0.3s both;
}

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

.stat-icon {
    font-size: 20px;
    color: var(--primary-light);
    margin-bottom: 4px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-white);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease 0.4s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
    color: white;
}

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

.btn-outline:hover {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    color: var(--text-white);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

/* Hero Visual */
.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
    width: 400px;
    height: 500px;
}

.floating-card {
    position: absolute;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    animation: float 6s ease-in-out infinite;
    box-shadow: var(--shadow-md);
}

.floating-card i {
    font-size: 18px;
}

.card-1 {
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.card-1 i { color: #ef4444; }

.card-2 {
    top: 40%;
    right: 60%;
    animation-delay: -2s;
}

.card-2 i { color: #f59e0b; }

.card-3 {
    bottom: 20%;
    right: 25%;
    animation-delay: -4s;
}

.card-3 i { color: #06b6d4; }

.mock-phone {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 340px;
    background: var(--bg-card);
    border-radius: 24px;
    border: 2px solid var(--border);
    padding: 12px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.mock-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-secondary);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 16px 8px;
    overflow: hidden;
}

.mock-ar-indicator {
    font-size: 10px;
    color: var(--success);
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(16, 185, 129, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.mock-3d-object {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.mock-logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.mock-ui-buttons {
    display: flex;
    gap: 6px;
}

.mock-ui-buttons span {
    font-size: 8px;
    padding: 4px 8px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 4px;
    color: var(--primary-light);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    font-size: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    animation: bounce 2s infinite;
    text-decoration: none;
}

/* ===== SECTION STYLES ===== */
.section {
    padding: 100px 0;
    position: relative;
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== ABOUT SECTION ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.3s;
}

.about-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.about-main {
    grid-column: 1 / -1;
    background: var(--gradient-card);
}

.about-card-icon {
    width: 48px;
    height: 48px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.about-badge {
    display: inline-block;
    margin-top: 12px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font-mono);
}

/* Team Section */
.team-section {
    margin-bottom: 40px;
}

.team-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.team-title i {
    color: var(--primary-light);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: all 0.3s;
}

.team-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.team-avatar {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    margin: 0 auto 16px;
}

.team-role {
    font-size: 11px;
    font-weight: 600;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.team-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Image Placeholders */
.image-placeholder-row {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.image-placeholder-row.compact {
    justify-content: flex-start;
    margin-top: 16px;
}

.image-placeholder {
    width: 240px;
    height: 160px;
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
    transition: all 0.3s;
}

.image-placeholder.small {
    width: 120px;
    height: 80px;
    font-size: 11px;
}

.image-placeholder i {
    font-size: 24px;
    opacity: 0.5;
}

.image-placeholder.small i {
    font-size: 16px;
}

.image-placeholder:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

/* ===== AR APPS SECTION ===== */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.app-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s;
}

.app-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.app-card-visual {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(99,102,241,0.05), rgba(6,182,212,0.05));
}

.app-icon {
    font-size: 48px;
    color: var(--primary-light);
    z-index: 1;
    transition: all 0.3s;
}

.app-card:hover .app-icon {
    transform: scale(1.15);
}

.app-glow {
    position: absolute;
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(99,102,241,0.15), transparent 70%);
    border-radius: 50%;
}

.app-card-content {
    padding: 24px;
}

.app-card-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.app-card-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.app-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.app-meta span {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.app-actions {
    display: flex;
    gap: 8px;
}

.apps-note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 32px;
}

.apps-note i {
    color: var(--primary-light);
    font-size: 18px;
    margin-top: 2px;
}

.apps-note p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== GALLERY SECTION ===== */
.gallery-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.gallery-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    font-family: var(--font-main);
}

.gallery-tab:hover,
.gallery-tab.active {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    color: var(--primary-light);
}

.gallery-content {
    display: none;
}

.gallery-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 16px;
}

.gallery-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s;
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-placeholder {
    width: 100%;
    height: 200px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
    transition: all 0.3s;
}

.gallery-placeholder i {
    font-size: 32px;
    opacity: 0.4;
}

.gallery-placeholder:hover {
    border-color: var(--primary);
}

.gallery-note {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.video-placeholder {
    width: 100%;
    height: 240px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 14px;
    transition: all 0.3s;
    cursor: pointer;
}

.video-placeholder i {
    font-size: 48px;
    color: #ff0000;
    opacity: 0.8;
    transition: all 0.3s;
}

.video-placeholder small {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

.video-placeholder:hover {
    border-color: var(--primary);
}

.video-placeholder:hover i {
    opacity: 1;
    transform: scale(1.1);
}

.video-embed-container {
    width: 100%;
    height: 240px;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    background: #000;
}

.video-embed-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ===== CONCEPTS / ACCORDION ===== */
.concepts-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 900px;
    margin: 0 auto;
}

.concept-accordion {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s;
}

.concept-accordion:hover {
    border-color: var(--border-hover);
}

.concept-accordion.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.concept-header {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-main);
    text-align: left;
}

.concept-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--primary-light);
}

.concept-header h3 {
    flex: 1;
    font-size: 1rem;
    font-weight: 600;
}

.concept-toggle {
    font-size: 14px;
    color: var(--text-muted);
    transition: transform 0.3s;
}

.concept-accordion.active .concept-toggle {
    transform: rotate(180deg);
}

.concept-body {
    display: none;
    padding: 0 24px 24px;
    padding-left: 84px;
}

.concept-accordion.active .concept-body {
    display: block;
    animation: fadeIn 0.3s ease;
}

.concept-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.concept-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.concept-list li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: 16px;
    border-left: 2px solid var(--primary);
}

.concept-list li strong {
    color: var(--text-primary);
}

.concept-highlight {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.concept-highlight i {
    color: var(--accent);
    margin-top: 3px;
}

/* CT Grid (Computational Thinking) */
.ct-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.ct-item {
    background: rgba(99, 102, 241, 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}

.ct-icon {
    font-size: 24px;
    color: var(--primary-light);
    margin-bottom: 8px;
}

.ct-item strong {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.ct-item p {
    font-size: 0.8rem;
    margin-bottom: 0;
}

/* ===== TIMELINE (DESIGN PROCESS) ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto 60px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    opacity: 0.3;
}

.timeline-item {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    position: relative;
}

.timeline-number {
    width: 56px;
    height: 56px;
    min-width: 56px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    color: white;
    z-index: 1;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.timeline-content {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all 0.3s;
}

.timeline-content:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.timeline-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.timeline-content h3 i {
    color: var(--primary-light);
}

.timeline-content > p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.timeline-content ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.timeline-content ul li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: 16px;
    border-left: 2px solid rgba(99, 102, 241, 0.3);
    line-height: 1.6;
}

.timeline-content ul li strong {
    color: var(--text-primary);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.tool-card {
    background: rgba(99, 102, 241, 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
}

.tool-card strong {
    display: block;
    color: var(--primary-light);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.tool-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ===== TIPS SECTION ===== */
.tips-section {
    margin-top: 60px;
}

.tips-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tips-title i {
    color: var(--accent);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.tip-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    border-top: 3px solid transparent;
    transition: all 0.3s;
}

.tip-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.tip-unity { border-top-color: var(--primary); }
.tip-ux { border-top-color: var(--secondary); }
.tip-edu { border-top-color: var(--accent); }
.tip-build { border-top-color: var(--success); }

.tip-category {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.tip-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.tip-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Format Section */
.format-section {
    margin-top: 40px;
}

.format-section > h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.format-section > h4 i {
    color: var(--primary-light);
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.format-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
}

.format-ext {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-light);
    background: rgba(99, 102, 241, 0.1);
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.format-card strong {
    display: block;
    color: var(--text-white);
    margin-bottom: 6px;
}

.format-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.format-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.format-badge.best {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.format-badge.good {
    background: rgba(6, 182, 212, 0.1);
    color: var(--secondary);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

/* ===== RESOURCES SECTION ===== */
.resources-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-bottom: 40px;
}

.resource-category h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.resource-category h3 i {
    color: var(--primary-light);
}

.resource-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all 0.3s;
}

.resource-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.resource-icon {
    width: 44px;
    height: 44px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--primary-light);
    margin-bottom: 12px;
}

.resource-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.resource-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.resource-url {
    display: inline-block;
    margin-top: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--secondary);
    background: rgba(6, 182, 212, 0.08);
    padding: 4px 10px;
    border-radius: 4px;
}

.resource-badge {
    display: inline-block;
    margin-top: 8px;
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Warnings */
.warnings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.warning-card {
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid rgba(245, 158, 11, 0.15);
    border-radius: var(--radius-md);
    padding: 24px;
}

.warning-icon {
    font-size: 24px;
    color: var(--accent);
    margin-bottom: 12px;
}

.warning-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.warning-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== FAQ SECTION ===== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s;
}

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

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    font-family: var(--font-main);
}

.faq-question i {
    color: var(--primary-light);
    transition: transform 0.3s;
    font-size: 14px;
}

.faq-item.active .faq-question i {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 24px 24px;
}

.faq-item.active .faq-answer {
    display: block;
    animation: fadeIn 0.3s ease;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 12px;
    line-height: 1.7;
}

.faq-tip {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.faq-tip i {
    color: var(--secondary);
    margin-top: 2px;
}

.faq-checklist {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-check-item {
    display: flex;
    gap: 14px;
}

.faq-check-item > i {
    font-size: 20px;
    color: var(--primary-light);
    margin-top: 2px;
}

.faq-check-item strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.faq-check-item p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* ===== OUTPUTS SECTION ===== */
.outputs-timeline {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.output-item {
    display: flex;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all 0.3s;
}

.output-item:hover {
    border-color: var(--border-hover);
}

.output-item.upcoming {
    opacity: 0.6;
    border-style: dashed;
}

.output-date {
    min-width: 80px;
    text-align: center;
    padding-top: 4px;
}

.output-day {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-light);
    font-family: var(--font-mono);
    line-height: 1;
}

.output-month {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

.output-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.output-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== CONTACT SECTION ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all 0.3s;
}

.contact-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    margin: 0 auto 16px;
}

.contact-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.coming-soon {
    font-style: italic;
    color: var(--text-muted) !important;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 12px;
    align-items: center;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
}

.social-link.instagram {
    background: linear-gradient(135deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888);
    color: white;
}

.social-link.instagram:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 39, 67, 0.35);
}

.social-link.youtube {
    background: #FF0000;
    color: white;
}

.social-link.youtube:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 0, 0, 0.35);
}

.social-link i {
    font-size: 20px;
}

/* Eski sosyal medya placeholder - geriye dönük uyumluluk */
.social-icons-placeholder {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
}

.social-icons-placeholder i {
    font-size: 24px;
    color: var(--text-muted);
    opacity: 0.5;
    transition: all 0.3s;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    padding: 48px 0 32px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 16px;
}

.footer-logo span {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-white);
}

.footer-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 24px;
    line-height: 1.6;
}

.footer-logos {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
}

.footer-logo-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.footer-logo-item i {
    font-size: 18px;
    color: var(--primary-light);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 20px;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-8px); }
    60% { transform: translateX(-50%) translateY(-4px); }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== PARTICLES ===== */
.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--primary-light);
    border-radius: 50%;
    opacity: 0.3;
    animation: particleFloat 15s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% {
        transform: translateY(-10vh) rotate(720deg);
        opacity: 0;
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero-visual {
        display: none;
    }

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

    .hero-stats {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .warnings-grid {
        grid-template-columns: 1fr;
    }

    .format-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--nav-bg-scrolled);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        max-height: calc(100vh - var(--nav-height));
        overflow-y: auto;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-link {
        padding: 12px 16px;
        font-size: 14px;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .apps-grid {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        flex-wrap: wrap;
    }

    .ct-grid {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .concept-body {
        padding-left: 24px;
    }

    .timeline::before {
        display: none;
    }

    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .timeline-number {
        width: 44px;
        height: 44px;
        min-width: 44px;
        font-size: 1rem;
    }

    .output-item {
        flex-direction: column;
        gap: 12px;
    }

    .output-date {
        text-align: left;
        display: flex;
        align-items: baseline;
        gap: 8px;
    }

    .output-day {
        font-size: 1.5rem;
    }

    .image-placeholder-row {
        flex-direction: column;
        align-items: center;
    }

    .image-placeholder-row.compact {
        flex-direction: row;
    }

    .resource-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .team-grid {
        grid-template-columns: 1fr;
    }

    .gallery-tabs {
        flex-direction: column;
    }

    .gallery-tab {
        justify-content: center;
    }
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
    position: fixed;
    bottom: 30px;
    right: 84px;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.theme-toggle:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.theme-toggle .fa-moon { display: inline-block; }
.theme-toggle .fa-sun { display: none; }

[data-theme="dark"] .theme-toggle .fa-moon { display: none; }
[data-theme="dark"] .theme-toggle .fa-sun { display: inline-block; color: #f59e0b; }

/* ===== LIGHT MODE SPECIFIC STYLES ===== */

/* Light mode cards need subtle shadow */
:root:not([data-theme="dark"]) .about-card,
:root:not([data-theme="dark"]) .app-card,
:root:not([data-theme="dark"]) .team-card,
:root:not([data-theme="dark"]) .concept-accordion,
:root:not([data-theme="dark"]) .timeline-content,
:root:not([data-theme="dark"]) .tip-card,
:root:not([data-theme="dark"]) .resource-card,
:root:not([data-theme="dark"]) .faq-item,
:root:not([data-theme="dark"]) .output-item,
:root:not([data-theme="dark"]) .contact-card,
:root:not([data-theme="dark"]) .format-card,
:root:not([data-theme="dark"]) .warning-card {
    box-shadow: var(--shadow-sm);
}

/* Light mode section-tag */
:root:not([data-theme="dark"]) .section-tag {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
    border-color: rgba(79, 70, 229, 0.15);
}

/* Light mode nav link active */
:root:not([data-theme="dark"]) .nav-link:hover,
:root:not([data-theme="dark"]) .nav-link.active {
    color: var(--primary);
    background: rgba(79, 70, 229, 0.06);
}

/* Light mode hero grid */
:root:not([data-theme="dark"]) .hero-grid {
    background-image:
        linear-gradient(rgba(79,70,229,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(79,70,229,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* Light mode particles - more subtle */
:root:not([data-theme="dark"]) .particle {
    background: var(--primary);
    opacity: 0.12;
}

/* Light mode hero text */
:root:not([data-theme="dark"]) .hero-title {
    color: #0f172a;
}

:root:not([data-theme="dark"]) .hero-description {
    color: #475569;
}

/* Light mode about-card-icon, concept-icon, resource-icon */
:root:not([data-theme="dark"]) .about-card-icon,
:root:not([data-theme="dark"]) .concept-icon,
:root:not([data-theme="dark"]) .resource-icon {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

/* Light mode concept highlight */
:root:not([data-theme="dark"]) .concept-highlight {
    background: rgba(217, 119, 6, 0.06);
    border-color: rgba(217, 119, 6, 0.2);
}

/* Light mode about badge */
:root:not([data-theme="dark"]) .about-badge {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

/* Light mode apps note */
:root:not([data-theme="dark"]) .apps-note {
    background: rgba(79, 70, 229, 0.05);
    border-color: rgba(79, 70, 229, 0.12);
}

/* Light mode gallery tab active */
:root:not([data-theme="dark"]) .gallery-tab:hover,
:root:not([data-theme="dark"]) .gallery-tab.active {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

/* Light mode CT items */
:root:not([data-theme="dark"]) .ct-item {
    background: rgba(79, 70, 229, 0.04);
}

/* Light mode tool cards */
:root:not([data-theme="dark"]) .tool-card {
    background: rgba(79, 70, 229, 0.04);
}

/* Light mode tip categories */
:root:not([data-theme="dark"]) .tip-unity { border-top-color: var(--primary); }
:root:not([data-theme="dark"]) .tip-ux { border-top-color: var(--secondary); }
:root:not([data-theme="dark"]) .tip-edu { border-top-color: var(--accent); }
:root:not([data-theme="dark"]) .tip-build { border-top-color: var(--success); }

/* Light mode format ext badge */
:root:not([data-theme="dark"]) .format-ext {
    background: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

/* Light mode format badge */
:root:not([data-theme="dark"]) .format-badge.best {
    background: rgba(5, 150, 105, 0.08);
    color: var(--success);
    border-color: rgba(5, 150, 105, 0.2);
}

:root:not([data-theme="dark"]) .format-badge.good {
    background: rgba(8, 145, 178, 0.08);
    color: var(--secondary);
    border-color: rgba(8, 145, 178, 0.2);
}

/* Light mode FAQ tip */
:root:not([data-theme="dark"]) .faq-tip {
    background: rgba(8, 145, 178, 0.05);
    border-color: rgba(8, 145, 178, 0.12);
}

/* Light mode resource url */
:root:not([data-theme="dark"]) .resource-url {
    background: rgba(8, 145, 178, 0.06);
    color: var(--secondary);
}

/* Light mode resource badge (AI trend) */
:root:not([data-theme="dark"]) .resource-badge {
    background: rgba(217, 119, 6, 0.08);
    color: var(--accent);
    border-color: rgba(217, 119, 6, 0.2);
}

/* Light mode mock UI buttons */
:root:not([data-theme="dark"]) .mock-ui-buttons span {
    background: rgba(79, 70, 229, 0.12);
    color: var(--primary);
}

/* Light mode mock AR indicator */
:root:not([data-theme="dark"]) .mock-ar-indicator {
    color: var(--success);
    background: rgba(5, 150, 105, 0.08);
    border-color: rgba(5, 150, 105, 0.2);
}

/* Light mode app meta */
:root:not([data-theme="dark"]) .app-card-visual {
    background: linear-gradient(135deg, rgba(79,70,229,0.04), rgba(8,145,178,0.03));
}

/* Light mode app glow */
:root:not([data-theme="dark"]) .app-glow {
    background: radial-gradient(circle, rgba(79,70,229,0.08), transparent 70%);
}

/* Light mode concept list border */
:root:not([data-theme="dark"]) .concept-list li {
    border-left-color: var(--primary);
}

/* Light mode timeline line */
:root:not([data-theme="dark"]) .timeline-content ul li {
    border-left-color: rgba(79, 70, 229, 0.2);
}

/* Light mode footer */
:root:not([data-theme="dark"]) .footer {
    background: #e2e8f0;
    border-top-color: rgba(79, 70, 229, 0.1);
}

/* Light mode section-dark = slightly gray bg */
:root:not([data-theme="dark"]) .section-dark {
    background: #f1f5f9;
}

/* Light mode image placeholder */
:root:not([data-theme="dark"]) .image-placeholder {
    background: #f1f5f9;
    border-color: rgba(79, 70, 229, 0.15);
}

/* Light mode gallery placeholder */
:root:not([data-theme="dark"]) .gallery-placeholder {
    background: #f1f5f9;
}

/* Light mode video placeholder */
:root:not([data-theme="dark"]) .video-placeholder {
    background: #f1f5f9;
}

/* Light mode warning cards */
:root:not([data-theme="dark"]) .warning-card {
    background: rgba(217, 119, 6, 0.04);
    border-color: rgba(217, 119, 6, 0.12);
}

/* Light mode social icons placeholder */
:root:not([data-theme="dark"]) .social-icons-placeholder i {
    color: #94a3b8;
}

/* Light mode scroll indicator */
:root:not([data-theme="dark"]) .scroll-indicator {
    color: #64748b;
}

/* Light mode coming-soon text */
:root:not([data-theme="dark"]) .coming-soon {
    color: #94a3b8 !important;
}

/* Light mode output upcoming */
:root:not([data-theme="dark"]) .output-item.upcoming {
    opacity: 0.5;
}

/* Transition for theme change */
body,
.navbar,
.section,
.section-dark,
.footer,
.about-card,
.app-card,
.team-card,
.concept-accordion,
.timeline-content,
.tip-card,
.resource-card,
.faq-item,
.output-item,
.contact-card,
.format-card,
.warning-card,
.floating-card,
.mock-phone,
.mock-screen,
.gallery-tab,
.gallery-placeholder,
.video-placeholder,
.image-placeholder,
.hero-badge,
.theme-toggle,
.back-to-top {
    transition: background 0.3s, color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* ===== THUMBNAIL & LIGHTBOX ===== */

/* Thumbnail images: fill placeholder box, keep aspect ratio */
.thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-md);
}

.image-placeholder.has-img {
    border: none;
    padding: 0;
    overflow: hidden;
}

.image-placeholder.has-img a {
    display: block;
    width: 100%;
    height: 100%;
}

.gallery-item .lightbox-trigger {
    display: block;
    width: 100%;
    height: 200px;
}

.gallery-item .thumb-img {
    height: 200px;
}

/* Lightbox overlay */
.lightbox-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    cursor: zoom-out;
}

.lightbox-overlay.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 60px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.3s;
}

.lightbox-overlay.active .lightbox-img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px; right: 20px;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    width: 48px; height: 48px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    z-index: 10001;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ===== HERO LOGO ŞERİDİ ===== */
.hero-logos {
    margin-top: 32px;
    text-align: center;
}

.hero-logos-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.45);
    margin-bottom: 12px;
}

.hero-logos-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.hero-logo-item {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-logo-img {
    max-height: 112px;
    max-width: 280px;
    object-fit: contain;
    filter: none;
    transition: opacity 0.3s, transform 0.3s;
    border-radius: 8px;
    background: rgba(255,255,255,0.92);
    padding: 8px 14px;
}

.hero-logo-img:hover {
    opacity: 0.9;
    transform: scale(1.04);
}

.hero-logo-placeholder {
    width: 160px;
    height: 96px;
    border: 1.5px dashed rgba(255,255,255,0.2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.2);
    font-size: 24px;
}

/* Eğer hiç logo yüklenmemişse şeridi küçük göster */
.hero-logos:not(.has-logos) .hero-logos-label {
    display: none;
}

/* ===== ABOUT KART LOGO THUMBNAIL (İKON YERİNE) ===== */
.about-card-icon.has-logo-thumb {
    width: 80px;
    height: 80px;
    background: transparent;
    border-radius: var(--radius-md);
    overflow: hidden;
    padding: 0;
}

.about-card-icon.has-logo-thumb a {
    display: block;
    width: 100%;
    height: 100%;
}

.card-icon-logo-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--radius-md);
    transition: transform 0.3s;
}

.card-icon-logo-thumb:hover {
    transform: scale(1.06);
}

/* ===== OUTPUT BULLETS ===== */
.output-bullets {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.output-bullets li {
    font-size: 13px;
    color: var(--text-muted);
    padding-left: 14px;
    position: relative;
}

.output-bullets li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.output-quote {
    font-style: italic;
    color: var(--text-muted);
    font-size: 13px;
    border-left: 3px solid var(--primary-light);
    padding-left: 12px;
    margin: 8px 0;
    line-height: 1.6;
}

.about-card-text2 {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
    line-height: 1.6;
}

/* ===== EKİP KARTI GÜNCELLEMESİ ===== */
.team-title-text {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-top: 6px;
    text-align: center;
}

.btn-arbis {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 10px;
    padding: 5px 12px;
    background: var(--primary);
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s, transform 0.2s;
}

.btn-arbis:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    color: white;
}

/* ===== ADMİN: GALERİ EKLE BUTONU ===== */
.btn-add-gallery {
    margin-top: 12px;
    padding: 8px 18px;
    background: transparent;
    border: 1.5px dashed var(--primary);
    color: var(--primary);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, color 0.2s;
}

.btn-add-gallery:hover {
    background: var(--primary);
    color: white;
}