/* ============================================================
   MDroid Emulator - Landing Page Styles
   Theme: Dark, Modern, Professional
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #1e1e32;
    --bg-card-hover: #252540;
    --bg-elevated: #2a2a45;
    --accent-primary: #6c9ff5;
    --accent-secondary: #a78bfa;
    --accent-glow: rgba(108, 159, 245, 0.25);
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --success: #4ade80;
    --warning: #fbbf24;
    --border: #2e2e48;
    --border-light: #3a3a58;
    --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #0f0f1a 100%);
    --gradient-accent: linear-gradient(135deg, #6c9ff5, #a78bfa);
    --gradient-card: linear-gradient(145deg, #1e1e32, #252540);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --max-width: 1200px;
    --header-height: 72px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

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

.section {
    padding: 100px 0;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }

/* --- Header/Nav --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.header.scrolled {
    background: rgba(15, 15, 26, 0.95);
    box-shadow: var(--shadow-md);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.2rem;
    font-weight: 700;
}

.logo-icon {
    width: 36px;
    height: 36px;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width 0.3s;
    border-radius: 1px;
}

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

.nav-links a:hover::after {
    width: 100%;
}

.btn-nav-download {
    padding: 10px 24px;
    background: var(--gradient-accent);
    color: #fff !important;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem !important;
    transition: transform 0.2s, box-shadow 0.2s !important;
}

.btn-nav-download:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow) !important;
}

.btn-nav-download::after { display: none !important; }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
}

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

.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
    background: var(--gradient-hero);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(108,159,245,0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(167,139,250,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(108, 159, 245, 0.1);
    border: 1px solid rgba(108, 159, 245, 0.2);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

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

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
}

.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 1s ease-out 0.3s both;
}

.hero-mockup {
    width: 100%;
    max-width: 520px;
    border-radius: var(--radius-lg);
    background: var(--gradient-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero-mockup-inner {
    text-align: center;
    padding: 40px;
}

.hero-mockup-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.hero-mockup-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* --- Stats Bar --- */
.stats-bar {
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

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

.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* --- Platforms Section --- */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 48px;
}

.platform-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s;
}

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

.platform-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.platform-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.platform-arch {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.platform-features {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.platform-features span {
    font-size: 0.85rem;
    color: var(--success);
}

/* --- Features Section --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 48px;
}

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

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.feature-name {
    font-size: 0.95rem;
    font-weight: 600;
}

/* --- How It Works --- */
.steps {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-top: 48px;
    position: relative;
}

.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0.3;
}

.step-card {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
}

.step-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.step-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* --- Screenshots Section --- */
.screenshots-section {
    background: var(--bg-secondary);
}

.carousel {
    position: relative;
    max-width: 800px;
    margin: 48px auto 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--bg-card);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
}

.carousel-slide-content {
    text-align: center;
    padding: 60px 40px;
}

.carousel-slide-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.4;
}

.carousel-slide-label {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 500;
}

.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
}

.carousel-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.carousel-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
}

.carousel-dots {
    display: flex;
    gap: 8px;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-light);
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.carousel-dot.active {
    background: var(--accent-primary);
    width: 24px;
    border-radius: 4px;
}

/* --- Requirements Section --- */
.requirements-table {
    max-width: 800px;
    margin: 48px auto 0;
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
}

.requirements-table thead {
    background: var(--bg-elevated);
}

.requirements-table th {
    padding: 16px 24px;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.requirements-table td {
    padding: 14px 24px;
    font-size: 0.95rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

.requirements-table td:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

.requirements-table tbody tr:hover {
    background: var(--bg-card-hover);
}

.check-icon { color: var(--success); }
.dash-icon { color: var(--text-muted); }

/* --- FAQ Section --- */
.faq-section {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 700px;
    margin: 48px auto 0;
    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: border-color 0.3s;
}

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

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

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
    transition: color 0.3s;
}

.faq-question:hover {
    color: var(--accent-primary);
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform 0.3s;
    color: var(--text-muted);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent-primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 24px 18px;
}

/* --- CTA / Download Section --- */
.cta-section {
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(108,159,245,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.cta-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.cta-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.btn-cta {
    padding: 18px 40px;
    font-size: 1.15rem;
    border-radius: var(--radius-sm);
}

.btn-cta.btn-primary {
    box-shadow: 0 8px 30px var(--accent-glow);
}

.version-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    max-width: 600px;
    margin: 0 auto;
}

.version-info-item {
    text-align: center;
}

.version-info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.version-info-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Footer --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 12px;
    max-width: 300px;
    line-height: 1.7;
}

.footer-column h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-column a {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

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

/* --- Animations --- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero p { margin: 0 auto 36px; }
    .hero-buttons { justify-content: center; }
    .features-grid { grid-template-columns: repeat(3, 1fr); }
    .platforms-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(3, 1fr); }
    .steps::before { display: none; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(15, 15, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.open { display: flex; }
    .mobile-toggle { display: flex; }

    .hero h1 { font-size: 2.2rem; }
    .section-title { font-size: 1.8rem; }
    .cta-title { font-size: 2rem; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .platforms-grid { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; gap: 32px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .footer-grid { grid-template-columns: 1fr; }

    .requirements-table { font-size: 0.85rem; }
    .requirements-table th,
    .requirements-table td { padding: 10px 12px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .features-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
}