:root {
    --bg-base: #f5f7fa;
    --bg-primary: #ffffff;
    --bg-secondary: #eef1f6;
    --bg-card: #ffffff;
    --text-primary: #1a2332;
    --text-secondary: #5a6a7a;
    --text-muted: #8899aa;
    --accent: #00b894;
    --accent-hover: #00a885;
    --accent-dim: rgba(0,184,148,0.10);
    --border: rgba(0,0,0,0.08);
    --radius: 12px;
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ── Header ────────────────────────────────────── */
.header {
    position: fixed; top: 0; left: 0; right: 0;
    background: rgba(245,247,250,0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: 0 24px;
}
.header-inner {
    max-width: 1100px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.logo {
    font-size: 18px; font-weight: 700;
    display: flex; align-items: center; gap: 10px;
}
.logo-icon {
    width: 32px; height: 32px; border-radius: 8px;
    background: var(--accent); display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: #fff; font-weight: 800;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
    font-size: 14px; color: var(--text-secondary);
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }
.lang-switch {
    display: flex; gap: 2px;
    background: var(--bg-secondary); border-radius: 6px; padding: 2px;
}
.lang-btn {
    padding: 4px 12px; border-radius: 5px; border: none;
    background: transparent; color: var(--text-muted);
    font-size: 12px; cursor: pointer; transition: all 0.2s;
}
.lang-btn.active { background: var(--accent); color: #fff; font-weight: 600; }

.mobile-menu-btn {
    display: none; background: none; border: none;
    color: var(--text-primary); font-size: 24px; cursor: pointer;
}

/* ── Hero ──────────────────────────────────────── */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    background: linear-gradient(180deg, #eef5f2 0%, var(--bg-base) 100%);
}
.hero h1 {
    font-size: 48px; font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #1a2332, var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero .subtitle {
    font-size: 18px; color: var(--text-secondary);
    max-width: 600px; margin: 0 auto 40px;
}
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }
.btn-primary {
    padding: 14px 32px; border-radius: 10px; border: none;
    background: var(--accent); color: #fff;
    font-size: 16px; font-weight: 600; cursor: pointer;
    transition: all 0.2s;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 20px rgba(0,184,148,0.3); }
.btn-secondary {
    padding: 14px 32px; border-radius: 10px;
    border: 1px solid rgba(0,0,0,0.12); background: transparent;
    color: var(--text-primary); font-size: 16px; cursor: pointer;
    transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.hero-visual {
    max-width: 1000px; margin: 0 auto;
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 12px;
    position: relative; overflow: hidden;
    box-shadow: 0 12px 50px rgba(0,0,0,0.08);
}
.hero-visual::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent), #0088ff, var(--accent));
}
.screenshot-placeholder {
    background: var(--bg-secondary); border-radius: 8px;
    height: 400px; display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); font-size: 14px;
}
.screenshot-img {
    width: 100%; border-radius: 8px; display: block;
}

/* ── Section ───────────────────────────────────── */
section { padding: 80px 0; }
.section-title {
    text-align: center; margin-bottom: 48px;
}
.section-title h2 {
    font-size: 32px; font-weight: 700; margin-bottom: 12px;
}
.section-title p {
    font-size: 16px; color: var(--text-secondary);
}

/* ── Features ──────────────────────────────────── */
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px;
    transition: all 0.3s;
}
.feature-card:hover {
    border-color: rgba(0,184,148,0.25);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}
.feature-icon {
    width: 44px; height: 44px; border-radius: 10px;
    background: var(--accent-dim); display: flex; align-items: center; justify-content: center;
    font-size: 20px; margin-bottom: 16px; color: var(--accent);
}
.feature-card h3 {
    font-size: 16px; font-weight: 600; margin-bottom: 8px;
}
.feature-card p {
    font-size: 13px; color: var(--text-secondary); line-height: 1.6;
}

/* ── Pricing ───────────────────────────────────── */
.pricing-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 20px; max-width: 900px; margin: 0 auto;
}
.pricing-card {
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px 20px; text-align: center;
    position: relative; transition: all 0.3s;
}
.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}
.pricing-card.popular {
    border-color: var(--accent);
    box-shadow: 0 0 30px rgba(0,184,148,0.12);
}
.pricing-card.popular::before {
    content: attr(data-badge);
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: var(--accent); color: #fff; font-size: 11px; font-weight: 700;
    padding: 4px 16px; border-radius: 20px;
}
.pricing-card h3 {
    font-size: 20px; font-weight: 700; margin-bottom: 8px;
}
.pricing-price {
    font-size: 40px; font-weight: 800; margin: 16px 0 8px;
    color: var(--text-primary);
}
.pricing-price span { font-size: 16px; font-weight: 400; color: var(--text-muted); }
.pricing-unit { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.pricing-savings {
    display: inline-block; font-size: 12px; font-weight: 600;
    color: var(--accent); background: var(--accent-dim);
    padding: 3px 10px; border-radius: 12px; margin-bottom: 20px;
}
.pricing-features {
    list-style: none; margin: 20px 0 28px; text-align: left;
}
.pricing-features li {
    padding: 8px 0; font-size: 14px; color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; gap: 8px;
}
.pricing-features li::before {
    content: '✓'; color: var(--accent); font-weight: 700;
}
.pricing-how {
    max-width: 700px; margin: 48px auto 0;
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 32px; text-align: center;
}
.pricing-how h3 {
    font-size: 18px; font-weight: 700; margin-bottom: 12px;
}
.pricing-how > p {
    font-size: 14px; color: var(--text-secondary); line-height: 1.7;
    margin-bottom: 24px;
}
.pricing-steps {
    display: flex; gap: 24px; justify-content: center;
    flex-wrap: wrap;
}
.pricing-step {
    display: flex; align-items: center; gap: 8px;
    font-size: 14px; color: var(--text-primary); font-weight: 500;
}

/* ── Download ──────────────────────────────────── */
.download-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.download-card {
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px; text-align: center;
    transition: all 0.3s;
}
.download-card:hover {
    border-color: rgba(0,184,148,0.25);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}
.download-icon { font-size: 36px; margin-bottom: 12px; color: var(--accent); display: flex; justify-content: center; }
.download-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.download-card .version { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; }
.download-btn {
    display: inline-block; padding: 10px 24px; border-radius: 8px;
    background: var(--accent); color: #fff;
    font-size: 14px; font-weight: 600; cursor: pointer;
    transition: all 0.2s; border: none; width: 100%;
}
.download-btn:hover { background: var(--accent-hover); box-shadow: 0 2px 12px rgba(0,184,148,0.3); }
.download-size { font-size: 11px; color: var(--text-muted); margin-top: 8px; }

/* ── FAQ ───────────────────────────────────────── */
.faq-list { max-width: 700px; margin: 0 auto; }
.faq-item {
    border: 1px solid var(--border); border-radius: 10px;
    margin-bottom: 12px; overflow: hidden;
    background: var(--bg-primary);
}
.faq-question {
    width: 100%; padding: 16px 20px;
    background: transparent; border: none;
    color: var(--text-primary); font-size: 15px; font-weight: 500;
    text-align: left; cursor: pointer;
    display: flex; justify-content: space-between; align-items: center;
    transition: color 0.2s;
}
.faq-question:hover { color: var(--accent); }
.faq-arrow {
    font-size: 12px; transition: transform 0.3s;
    color: var(--text-muted);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
}
.faq-answer-inner {
    padding: 0 20px 16px; font-size: 14px; color: var(--text-secondary); line-height: 1.7;
}

/* ── Footer ────────────────────────────────────── */
.footer {
    border-top: 1px solid var(--border);
    padding: 40px 0; text-align: center;
}
.footer p { font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }
.footer-links { margin-top: 12px; display: flex; justify-content: center; gap: 20px; }
.footer-links a { font-size: 13px; color: var(--text-secondary); }

/* ── Responsive ────────────────────────────────── */
@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .hero .subtitle { font-size: 15px; }
    .features-grid, .download-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); max-width: 500px; }
    .nav-links { display: none; }
    .nav-links.open {
        display: flex; flex-direction: column;
        position: absolute; top: 64px; left: 0; right: 0;
        background: var(--bg-primary); border-bottom: 1px solid var(--border);
        padding: 16px 24px; gap: 16px;
    }
    .mobile-menu-btn { display: block; }
}