/* ===== Design Tokens ===== */
:root {
    --bg: #0a0a0f;
    --bg-surface: rgba(255, 255, 255, 0.04);
    --bg-surface-hover: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.08);
    --text: #f0f0f5;
    --text-muted: #8a8a9a;
    --accent-coral: #f27059;
    --accent-amber: #f5a623;
    --gradient: linear-gradient(135deg, #f27059 0%, #f5a623 100%);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 16px;
    --radius-sm: 10px;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: var(--accent-coral);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-family: var(--font);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    opacity: 1;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 24px rgba(242, 112, 89, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 8px 32px rgba(242, 112, 89, 0.5);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text);
    border: 1px solid var(--border);
    backdrop-filter: blur(12px);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.btn-small {
    padding: 10px 24px;
    font-size: 0.9rem;
    background: var(--gradient);
    color: #fff;
    border-radius: 50px;
    font-weight: 600;
    display: inline-block;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-small:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(242, 112, 89, 0.4);
    opacity: 1;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 24px 60px;
    text-align: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(242, 112, 89, 0.12) 0%, rgba(245, 166, 35, 0.06) 40%, transparent 70%);
    pointer-events: none;
    animation: glowPulse 6s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
    50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
}

.hero-icon {
    border-radius: 24px;
    margin-bottom: 24px;
    filter: drop-shadow(0 8px 32px rgba(242, 112, 89, 0.3));
    animation: iconFloat 4s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.tagline {
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--text);
    margin-bottom: 12px;
}

.subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.subtitle em {
    color: var(--accent-amber);
    font-style: normal;
    font-weight: 500;
}

/* ===== Release Info ===== */
.release-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    min-height: 28px;
}

.release-info.visible {
    opacity: 1;
    transform: translateY(0);
}

.version-badge {
    background: var(--gradient);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    letter-spacing: 0.02em;
}

.release-date {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 400;
}

.cta-row {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

/* ===== Demo Screen ===== */
.demo-screen {
    position: relative;
    width: min(600px, 90vw);
    height: 360px;
    background: rgba(30, 30, 40, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(20px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.demo-topbar {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
}

.demo-dots {
    display: flex;
    gap: 6px;
}

.demo-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.demo-dots span:nth-child(1) { background: #ff5f57; }
.demo-dots span:nth-child(2) { background: #febc2e; }
.demo-dots span:nth-child(3) { background: #28c840; }

.demo-title {
    flex: 1;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-right: 48px;
}

.demo-content {
    position: relative;
    width: 100%;
    height: calc(100% - 37px);
    background:
        radial-gradient(circle at 20% 30%, rgba(242, 112, 89, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(245, 166, 35, 0.05) 0%, transparent 50%);
}

.demo-overlay {
    position: absolute;
    font-weight: 600;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
    opacity: 0;
    pointer-events: none;
}

.demo-overlay-1 {
    top: 30%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.4rem;
    color: #5bf0a5;
    animation: overlayPulse1 8s ease-in-out infinite;
}

.demo-overlay-2 {
    top: 60%;
    left: 40%;
    transform: translateX(-50%) rotate(-2deg);
    font-size: 1.1rem;
    color: #f5a623;
    font-family: serif;
    background: rgba(0, 0, 0, 0.4);
    padding: 8px 20px;
    border-radius: 24px;
    animation: overlayPulse2 8s ease-in-out infinite;
    animation-delay: 4s;
}

@keyframes overlayPulse1 {
    0% { opacity: 0; transform: translateX(-50%) translateY(20px); }
    8% { opacity: 1; transform: translateX(-50%) translateY(0); }
    42% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0; transform: translateX(-50%) translateY(-10px); }
    100% { opacity: 0; }
}

@keyframes overlayPulse2 {
    0% { opacity: 0; transform: translateX(-50%) rotate(-2deg) scale(0.8); }
    8% { opacity: 1; transform: translateX(-50%) rotate(-2deg) scale(1); }
    42% { opacity: 1; transform: translateX(-50%) rotate(-2deg) scale(1); }
    50% { opacity: 0; transform: translateX(-50%) rotate(-2deg) scale(1.05); }
    100% { opacity: 0; }
}

/* ===== Sections Common ===== */
.features, .platforms, .oss {
    max-width: 1100px;
    margin: 0 auto;
    padding: 80px 24px;
}

h2 {
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    letter-spacing: -0.02em;
}

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

.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    background: var(--bg-surface-hover);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== Platform Cards ===== */
.platform-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.platform-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 32px;
    text-align: center;
    transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.platform-card:hover {
    transform: translateY(-4px);
    background: var(--bg-surface-hover);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.platform-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.platform-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.badge {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: 20px;
    vertical-align: middle;
}

.badge-beta {
    background: rgba(245, 166, 35, 0.2);
    color: var(--accent-amber);
}

.badge-exp {
    background: rgba(138, 138, 154, 0.2);
    color: var(--text-muted);
}

/* ===== Open Source ===== */
.oss {
    text-align: center;
    padding-bottom: 40px;
}

.oss-content {
    max-width: 560px;
    margin: 0 auto;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px 40px;
    backdrop-filter: blur(12px);
}

.oss-content p {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 1.05rem;
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer a {
    color: var(--text-muted);
    transition: color 0.2s;
}

footer a:hover {
    color: var(--text);
    opacity: 1;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2.8rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .features-grid,
    .platform-cards {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }

    .demo-screen {
        height: 280px;
    }

    .demo-overlay-1 {
        font-size: 1rem;
    }

    .demo-overlay-2 {
        font-size: 0.9rem;
    }

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

@media (max-width: 480px) {
    h1 {
        font-size: 2.2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .hero {
        padding: 60px 16px 40px;
    }
}