@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Noto+Sans+SC:wght@400;500&family=Sora:wght@600;700&display=swap');

:root {
    --bg: #0A0D12;
    --panel: #11151C;
    --ink: #E5EBEE;
    --dim: #78848F;
    --line: rgba(229, 235, 238, 0.09);
    --acc: #5CC8E8;
    --radius: 3px;
}

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

body {
    background-color: var(--bg);
    color: var(--ink);
    font-family: 'Noto Sans SC', sans-serif;
    font-weight: 400;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Sora', sans-serif;
    font-weight: 600;
    color: var(--ink);
}

.mono {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--dim);
}

a {
    color: var(--ink);
    transition: all 0.3s ease;
}

/* Base structural classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 10;
}

/* Header */
header {
    border-bottom: 1px solid var(--line);
    background: transparent;
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
    backdrop-filter: blur(10px);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 20px; font-weight: 700; font-family: 'Sora', sans-serif; text-decoration: none; display: flex; align-items: center; gap: 8px; color: var(--ink); }

nav a { font-size: 14px; }
nav a:hover { color: var(--acc) !important; }

/* Buttons */
.btn {
    display: inline-block;
    background: var(--acc);
    color: var(--bg); /* 实底按钮配深字 */
    padding: 12px 28px;
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    font-family: 'Noto Sans SC', sans-serif;
    text-align: center;
    border: 1px solid var(--acc);
    transition: all 0.3s ease;
    cursor: pointer;
}
.btn:hover {
    background: transparent;
    color: var(--acc);
    border-color: rgba(92,200,232,0.5);
}
.btn-large {
    padding: 16px 48px;
    font-size: 16px;
}
.btn-outline {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
}
.btn-outline:hover {
    border-color: rgba(92,200,232,0.5);
    color: var(--acc);
    background: transparent;
}

/* Sections */
section { padding: 80px 0; position: relative; z-index: 10; }
.section-title { text-align: center; font-size: 32px; margin-bottom: 16px; }
.section-subtitle { text-align: center; font-family: 'IBM Plex Mono', monospace; font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); margin-bottom: 48px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* Hero */
.hero { text-align: center; padding: 120px 0 100px; }
.hero h1 { font-size: 48px; margin-bottom: 24px; line-height: 1.2; letter-spacing: -0.5px; }
.hero h1 span { color: var(--ink); font-weight: 400; font-size: 36px; display: block; margin-top: 10px; }
.hero p { font-size: 16px; color: var(--dim); margin-bottom: 40px; max-width: 700px; margin-left: auto; margin-right: auto; }

/* Grids & Cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.card, .price-card, .review-card, .faq-item {
    background: var(--panel);
    padding: 40px 30px;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    text-align: left;
    transition: all 0.3s ease;
}
.card:hover, .price-card:hover, .review-card:hover, .faq-item:hover {
    border-color: rgba(92,200,232,0.5);
}
.card:hover h3, .price-card:hover h3, .review-card:hover h4, .faq-item:hover h4 {
    color: var(--acc);
}

.card-icon {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: var(--acc);
    margin-bottom: 20px;
    display: inline-block;
    padding: 4px 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(92,200,232,0.05);
}

.card h3 { font-size: 20px; margin-bottom: 12px; transition: color 0.3s; }
.card p { color: var(--dim); font-size: 14px; }

/* Pricing */
.price-card { display: flex; flex-direction: column; position: relative; }
.price-card.popular { border: 1px solid var(--acc); }
.badge {
    position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
    background: var(--bg); color: var(--acc); padding: 2px 12px;
    border: 1px solid var(--acc); border-radius: var(--radius);
    font-family: 'IBM Plex Mono', monospace; font-size: 11px; text-transform: uppercase;
}
.price-card h3 { font-size: 18px; margin-bottom: 10px; transition: color 0.3s; }
.price { font-size: 40px; font-weight: 700; margin: 15px 0; font-family: 'Sora', sans-serif; }
.price span { font-size: 14px; color: var(--dim); font-weight: 400; font-family: 'Noto Sans SC', sans-serif; }
.features-list { list-style: none; margin: 20px 0; flex-grow: 1; }
.features-list li { margin-bottom: 10px; padding-left: 20px; position: relative; font-size: 14px; color: var(--dim); }
.features-list li::before { content: ""; position: absolute; left: 0; top: 10px; width: 4px; height: 4px; background: var(--acc); border-radius: 50%; }

/* FAQ & Reviews */
.review-card p { font-style: normal; color: var(--dim); margin-bottom: 20px; font-size: 14px; }
.user-info { font-weight: 500; color: var(--ink); font-size: 12px; font-family: 'IBM Plex Mono', monospace; text-transform: uppercase; }
.stars { color: var(--acc); font-size: 12px; margin-bottom: 15px; letter-spacing: 0.1em; font-family: 'IBM Plex Mono', monospace; }

.faq-grid { display: grid; gap: 15px; max-width: 800px; margin: 0 auto; }
.faq-item { padding: 24px; text-align: left; }
.faq-item h4 { font-size: 16px; margin-bottom: 10px; transition: color 0.3s; }
.faq-item p { color: var(--dim); font-size: 14px; }

/* Sub pages */
.page-content { background: var(--panel); padding: 40px; border-radius: var(--radius); border: 1px solid var(--line); margin: 40px auto; max-width: 800px; }
.page-content h2, .page-content h3 { margin: 30px 0 15px; color: var(--ink); font-size: 20px; }
.page-content p { color: var(--dim); margin-bottom: 15px; font-size: 14px; }
.page-content ul { color: var(--dim); padding-left: 20px; font-size: 14px; margin-bottom: 15px; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 60px 0 30px; position: relative; z-index: 10; background: transparent; }
.footer-logo { font-size: 18px; font-weight: 700; font-family: 'Sora', sans-serif; color: var(--ink); margin-bottom: 20px; }
.footer-links { display: flex; justify-content: center; gap: 30px; margin-bottom: 30px; flex-wrap: wrap; }
.footer-links a { color: var(--dim); text-decoration: none; font-size: 14px; transition: color 0.3s; }
.footer-links a:hover { color: var(--acc); }
.copyright { border-top: 1px solid var(--line); padding-top: 20px; font-size: 12px; font-family: 'IBM Plex Mono', monospace; color: var(--dim); text-align: center; }

/* Animation Classes */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* Canvas Data Overlays */
.canvas-overlay {
    position: fixed;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--dim);
    z-index: 1;
    pointer-events: none;
}
.overlay-tl { top: 20px; left: 20px; }
.overlay-tr { top: 20px; right: 20px; }
.overlay-bl { bottom: 20px; left: 20px; }
.overlay-br { bottom: 20px; right: 20px; }

/* Hide overlays on very small screens to avoid overlapping content */
@media (max-width: 1024px) {
    .canvas-overlay { display: none; }
}

@media (max-width: 768px) {
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .hero { padding: 80px 0 60px; }
    .hero h1 { font-size: 32px; }
    .hero h1 span { font-size: 24px; }
    .btn { display: block; width: 100%; margin-bottom: 10px; }
    .nav-container { flex-direction: column; gap: 15px; }
    .nav-container > div, .center-nav { justify-content: center !important; width: 100%; }
    .header-btn-wrap { justify-content: center !important; }
    nav { gap: 15px; flex-direction: row; }
}

.skip-link { position: absolute; top: -40px; left: 0; background: var(--acc); color: var(--panel); padding: 8px; z-index: 100; transition: top 0.3s; }
.skip-link:focus { top: 0; }