/* 与 coming.html 一致的视觉变量 */
:root {
    --bg-from: #0a192f;
    --bg-to: #0d1b2a;
    --text: #e6f1ff;
    --text-muted: #a8b2d1;
    --text-dim: #8892b0;
    --accent: #64ffda;
    --accent-dim: rgba(100, 255, 218, 0.12);
    --line: rgba(100, 255, 218, 0.12);
    --panel: rgba(23, 42, 69, 0.55);
    --shadow: 0 10px 40px rgba(2, 12, 27, 0.65);
    --g1: #4cc9f0;
    --g2: #4361ee;
    --g3: #3a0ca3;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", "Microsoft YaHei", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, var(--bg-from) 0%, var(--bg-to) 100%);
    min-height: 100vh;
    line-height: 1.65;
    position: relative;
}

#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.circles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
}

.circles li {
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(100, 255, 218, 0.15);
    animation: float-up 25s linear infinite;
    bottom: -150px;
    border-radius: 50%;
}

.circles li:nth-child(1) { left: 25%; width: 80px; height: 80px; animation-delay: 0s; }
.circles li:nth-child(2) { left: 10%; width: 20px; height: 20px; animation-delay: 2s; animation-duration: 12s; }
.circles li:nth-child(3) { left: 70%; width: 20px; height: 20px; animation-delay: 4s; }
.circles li:nth-child(4) { left: 40%; width: 60px; height: 60px; animation-delay: 0s; animation-duration: 18s; }
.circles li:nth-child(5) { left: 65%; width: 20px; height: 20px; animation-delay: 0s; }
.circles li:nth-child(6) { left: 75%; width: 110px; height: 110px; animation-delay: 3s; }
.circles li:nth-child(7) { left: 35%; width: 150px; height: 150px; animation-delay: 7s; }
.circles li:nth-child(8) { left: 50%; width: 25px; height: 25px; animation-delay: 15s; animation-duration: 45s; }
.circles li:nth-child(9) { left: 20%; width: 15px; height: 15px; animation-delay: 2s; animation-duration: 35s; }
.circles li:nth-child(10) { left: 85%; width: 150px; height: 150px; animation-delay: 0s; animation-duration: 11s; }

@keyframes float-up {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-1000px) rotate(720deg); opacity: 0; }
}

.page-wrap {
    position: relative;
    z-index: 2;
}

.container {
    width: 1200px;
    max-width: 95%;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部 */
header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.35);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.brand i {
    color: var(--accent);
    font-size: 1.2rem;
    filter: drop-shadow(0 0 6px rgba(100, 255, 218, 0.35));
}

.brand .brand-text {
    background: linear-gradient(90deg, var(--g1), var(--g2), var(--g3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    justify-content: flex-end;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: color 0.25s ease, text-shadow 0.25s ease;
}

.nav-menu a:hover {
    color: var(--accent);
    text-shadow: 0 0 12px rgba(100, 255, 218, 0.35);
}

/* Banner */
.banner {
    padding: 100px 0 90px;
    position: relative;
}

.banner-content {
    max-width: 720px;
}

.banner h1 {
    font-size: clamp(1.75rem, 4vw, 2.6rem);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--g1), var(--g2), var(--g3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}

.banner h1::after {
    content: "";
    display: block;
    width: 120px;
    height: 3px;
    margin-top: 20px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    border-radius: 2px;
}

.banner p {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 28px;
    max-width: 600px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    color: #0a192f;
    background: var(--accent);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    border: 1px solid rgba(100, 255, 218, 0.35);
    box-shadow: 0 6px 24px rgba(100, 255, 218, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    background: #7dffdf;
    box-shadow: 0 8px 28px rgba(100, 255, 218, 0.35);
}

/* 板块标题 */
.section {
    padding: 72px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    font-weight: 800;
    margin-bottom: 14px;
    color: var(--text);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title h2::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    border-radius: 2px;
}

.section-title p {
    color: var(--text-muted);
    max-width: 720px;
    margin: 22px auto 0;
    font-size: 0.98rem;
}