/* ===== CSS Variables ===== */
:root {
    --color-bg: #ffffff;
    --color-bg-subtle: #f0fdfa;
    --color-bg-card: #ffffff;
    --color-bg-elevated: #f0fdf4;
    --color-border: #d1e7e4;
    --color-border-subtle: #e6f5f3;

    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-primary-glow: rgba(13, 148, 136, 0.25);

    --color-accent: #6366f1;
    --color-accent-secondary: #22c55e;

    --gradient-primary: linear-gradient(135deg, #0d9488 0%, #6366f1 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(13, 148, 136, 0.08) 0%, transparent 70%);
    --gradient-hero: linear-gradient(180deg, #f0fdfa 0%, #ffffff 100%);

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

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

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 60px var(--color-primary-glow);

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    scroll-behavior: smooth;
}

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

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

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

/* ===== Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: 1.25rem;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), 0 0 30px var(--color-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 50px var(--color-primary-glow);
}

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

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

.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

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

.nav-links a {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 10px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.nav-cta:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
    padding: 70px 24px 80px;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    background: var(--gradient-hero);
}

.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(ellipse at center, rgba(13, 148, 136, 0.08) 0%, rgba(99, 102, 241, 0.05) 40%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero h1 {
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 520px;
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: 20px;
}

.hero-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    z-index: 1;
}

.app-preview-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

/* ===== Features ===== */
.features {
    padding: 120px 0;
    position: relative;
    background: var(--color-bg);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-header p {
    margin-top: 16px;
    color: var(--color-text-secondary);
    font-size: 1.125rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.feature-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

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

.feature-highlight {
    grid-column: span 2;
    background: linear-gradient(135deg, #f0fdfa 0%, #eef2ff 100%);
    border-color: rgba(13, 148, 136, 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #f0fdfa 0%, #e0f2fe 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ===== Showcase ===== */
.showcase {
    padding: 80px 0 120px;
    background: var(--color-bg-subtle);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.showcase-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    opacity: 0;
    transform: translateY(20px);
}

.showcase-content.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.showcase-text h2 {
    margin-bottom: 20px;
}

.showcase-text > p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: 32px;
}

.showcase-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.showcase-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-text-secondary);
}

.showcase-list svg {
    color: #22c55e;
    flex-shrink: 0;
}

.showcase-visual {
    display: flex;
    justify-content: center;
}

.export-preview {
    position: relative;
}

.export-frame {
    position: relative;
    width: 400px;
    aspect-ratio: 16/10;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: 20px;
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.export-content {
    width: 100%;
    height: 100%;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.zoom-demo {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.zoom-area {
    width: 60%;
    height: 60%;
    background: linear-gradient(135deg, var(--color-bg-subtle) 0%, var(--color-bg-elevated) 100%);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    animation: zoom-demo 3s ease-in-out infinite;
}

@keyframes zoom-demo {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 120px 0;
    background: var(--color-bg);
}

.steps {
    display: flex;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
}

.step.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.step-content h3 {
    margin-bottom: 12px;
}

.step-content p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ===== Download ===== */
.download {
    padding: 80px 0 120px;
    background: var(--color-bg);
}

.download-card {
    background: linear-gradient(135deg, #f0fdfa 0%, #eef2ff 50%, #f0fdf4 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(ellipse at center, rgba(13, 148, 136, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-content h2 {
    margin-bottom: 16px;
}

.download-content > p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    max-width: 500px;
    margin: 0 auto 40px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.download-meta {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.meta-item svg {
    color: var(--color-text-secondary);
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 40px;
    background: var(--color-bg-subtle);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 12px;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: var(--color-text);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 120px;
    }

    .hero-subtitle {
        margin: 0 auto 40px;
    }

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

    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }

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

    .feature-highlight {
        grid-column: span 2;
    }

    .showcase-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

    .showcase-list {
        align-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    .feature-highlight {
        grid-column: span 1;
    }

    .steps {
        flex-direction: column;
        gap: 48px;
    }

    .download-card {
        padding: 48px 24px;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-meta {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
        align-items: center;
        text-align: center;
    }

    .export-frame {
        width: 100%;
        max-width: 350px;
    }
}

/* ===== Animation Delays ===== */
.feature-card:nth-child(1) { transition-delay: 0ms; }
.feature-card:nth-child(2) { transition-delay: 50ms; }
.feature-card:nth-child(3) { transition-delay: 100ms; }
.feature-card:nth-child(4) { transition-delay: 150ms; }
.feature-card:nth-child(5) { transition-delay: 200ms; }
.feature-card:nth-child(6) { transition-delay: 250ms; }

.step:nth-child(1) { transition-delay: 0ms; }
.step:nth-child(2) { transition-delay: 100ms; }
.step:nth-child(3) { transition-delay: 200ms; }