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

:root {
    --green: #0d9488;
    --green-dark: #0f766e;
    --green-light: #14b8a6;
    --green-bg: #ecfdf5;
    --orange: #f97316;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --white: #ffffff;
    --shadow: 0 12px 40px rgba(15, 23, 42, 0.12);
    --radius: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--white);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
}

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

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    gap: 16px;
}

.header-downloads {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-header-download-secondary {
    background: var(--white);
    color: var(--green-dark);
    border: 1px solid rgba(13, 148, 136, 0.35);
    box-shadow: none;
}

.btn-header-download-secondary:hover {
    background: var(--green-bg);
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--green-dark);
}

.btn-header-download,
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-header-download {
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--green-light), var(--green));
    color: var(--white);
    box-shadow: 0 8px 24px rgba(13, 148, 136, 0.25);
}

.btn-header-download:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(13, 148, 136, 0.32);
}

/* Hero */
.hero {
    background:
        radial-gradient(circle at 85% 15%, rgba(20, 184, 166, 0.18), transparent 35%),
        radial-gradient(circle at 10% 80%, rgba(13, 148, 136, 0.12), transparent 40%),
        linear-gradient(180deg, #f0fdfa 0%, #ffffff 100%);
    padding: 56px 0 72px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 48px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    margin-bottom: 16px;
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid rgba(13, 148, 136, 0.18);
    color: var(--green-dark);
    font-size: 0.95rem;
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    line-height: 1.15;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-muted);
    margin-bottom: 24px;
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
}

.feature-tags span {
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--white);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 0.92rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.btn-primary {
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--green-light), var(--green));
    color: var(--white);
    box-shadow: 0 10px 28px rgba(13, 148, 136, 0.28);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(13, 148, 136, 0.34);
}

.btn-secondary {
    padding: 14px 32px;
    background: var(--white);
    color: var(--green-dark);
    border: 2px solid rgba(13, 148, 136, 0.25);
}

.btn-secondary:hover {
    border-color: var(--green);
    transform: translateY(-2px);
}

.hero-visual img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(15, 23, 42, 0.06);
}

/* Feature strip */
.feature-strip {
    background: var(--green-dark);
    color: var(--white);
    padding: 28px 0;
}

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

.feature-strip-grid article {
    text-align: center;
}

.feature-strip-grid strong {
    display: block;
    font-size: 1.05rem;
    margin-bottom: 6px;
}

.feature-strip-grid span {
    font-size: 0.9rem;
    opacity: 0.85;
}

/* Showcase sections */
.showcase {
    padding: 88px 0;
}

.showcase:nth-of-type(even) {
    background: #f8fafc;
}

.showcase-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.showcase-label {
    display: inline-block;
    margin-bottom: 12px;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--green-bg);
    color: var(--green-dark);
    font-size: 0.9rem;
    font-weight: 600;
}

.showcase-copy h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    line-height: 1.25;
    margin-bottom: 16px;
}

.showcase-copy p {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.85;
    margin-bottom: 24px;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(15, 23, 42, 0.06);
}

/* CTA banner */
.cta-banner {
    padding: 72px 0;
    background:
        linear-gradient(135deg, rgba(13, 148, 136, 0.95), rgba(15, 118, 110, 0.98));
    color: var(--white);
}

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.cta-inner h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 8px;
}

.cta-inner p {
    opacity: 0.92;
}

.cta-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.cta-actions .btn-secondary.btn-large {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.75);
}

.cta-actions .btn-secondary.btn-large:hover {
    background: rgba(255, 255, 255, 0.12);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.05rem;
    background: var(--white);
    color: var(--green-dark);
    box-shadow: none;
    white-space: nowrap;
}

.btn-large:hover {
    background: #f0fdfa;
}

/* Footer */
.site-footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 28px 0;
    text-align: center;
    font-size: 0.875rem;
}

@media (max-width: 960px) {
    .hero-grid,
    .showcase-grid,
    .feature-strip-grid,
    .cta-inner {
        grid-template-columns: 1fr;
    }

    .cta-inner {
        flex-direction: column;
        text-align: center;
    }

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

    .showcase-right .showcase-copy {
        order: -1;
    }
}

@media (max-width: 640px) {
    .hero {
        padding-top: 32px;
    }

    .showcase {
        padding: 56px 0;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions a {
        width: 100%;
    }
}