/* ===== 设计令牌 =====
 * 配色以"蜜蜂 / 蜂蜜"为灵感，主色蜂蜜金、深色为底，暖白为背景
 * 字体使用国内系统默认字体栈，不引入国外字体
 */
:root {
    --color-honey: #F5A623;          /* 主色：蜂蜜金 */
    --color-honey-dark: #D88A0E;    /* 主色深 */
    --color-honey-light: #FFD27F;   /* 主色浅 */
    --color-ink: #1A1A1A;           /* 主文字 */
    --color-ink-soft: #3A3A3A;      /* 次要文字 */
    --color-warm: #FFFBF5;          /* 暖白背景 */
    --color-paper: #FAF6EE;         /* 卡片背景 */
    --color-line: #EDE4D3;          /* 分割线 */
    --color-accent: #2D7DD2;        /* 点缀：科技蓝 */
    --color-dark: #141413;          /* 深色区底 */

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;

    --shadow-sm: 0 2px 8px rgba(26, 26, 26, 0.06);
    --shadow-md: 0 8px 28px rgba(26, 26, 26, 0.08);
    --shadow-honey: 0 12px 32px rgba(245, 166, 35, 0.22);

    --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
                 "WenQuanYi Micro Hei", system-ui, -apple-system, sans-serif;

    --container: 1180px;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--color-ink);
    background: var(--color-warm);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 14px 32px; border-radius: 999px;
    font-size: 15px; font-weight: 600; letter-spacing: 0.02em;
    transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
}
.btn-primary { background: var(--color-honey); color: var(--color-ink); box-shadow: var(--shadow-honey); }
.btn-primary:hover { transform: translateY(-2px); background: var(--color-honey-dark); }
.btn-ghost { background: transparent; color: var(--color-ink); border: 1.5px solid rgba(26,26,26,0.2); }
.btn-ghost:hover { border-color: var(--color-honey); color: var(--color-honey-dark); transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ===== 顶部导航 ===== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255, 251, 245, 0.85);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color .3s, background .3s, box-shadow .3s;
}
.header.scrolled { border-color: var(--color-line); box-shadow: var(--shadow-sm); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img {
    width: 42px; height: 42px; object-fit: contain;
    border-radius: 50%; background: transparent;
    flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-zh { font-size: 18px; font-weight: 800; color: var(--color-ink); letter-spacing: 0.04em; }
.brand-en { font-size: 11px; font-weight: 600; color: var(--color-honey-dark); letter-spacing: 0.15em; }
.nav { display: flex; gap: 4px; }
.nav-link {
    padding: 8px 16px; font-size: 15px; font-weight: 500; color: var(--color-ink-soft);
    border-radius: 999px; transition: color .2s, background .2s;
}
.nav-link:hover { color: var(--color-honey-dark); background: rgba(245, 166, 35, 0.1); }
.nav-link.active { color: var(--color-honey-dark); background: rgba(245, 166, 35, 0.14); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-ink); border-radius: 2px; transition: .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero 区 ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding-top: 72px; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.55; }
.glow-1 { width: 520px; height: 520px; background: var(--color-honey); top: -120px; right: -100px; }
.glow-2 { width: 440px; height: 440px; background: var(--color-honey-light); bottom: -140px; left: -80px; opacity: 0.4; }
.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(26,26,26,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26,26,26,0.04) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.hero-content { position: relative; z-index: 1; max-width: 880px; padding-top: 40px; }
.hero-eyebrow {
    display: inline-block; margin: 0 0 24px; padding: 8px 16px;
    background: rgba(245, 166, 35, 0.12); color: var(--color-honey-dark);
    border: 1px solid rgba(245, 166, 35, 0.3);
    border-radius: 999px; font-size: 13px; font-weight: 600; letter-spacing: 0.03em;
}
.hero-title {
    margin: 0 0 24px; font-size: clamp(34px, 5.5vw, 64px); font-weight: 900;
    line-height: 1.12; letter-spacing: -0.01em; color: var(--color-ink);
}
.hero-title .accent {
    background: linear-gradient(120deg, var(--color-honey) 0%, var(--color-honey-dark) 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-desc { margin: 0 0 36px; max-width: 640px; font-size: 18px; color: var(--color-ink-soft); }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
    position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.scroll-line { width: 1px; height: 36px; background: linear-gradient(var(--color-honey), transparent); animation: scrollPulse 1.8s ease-in-out infinite; }
.scroll-text { font-size: 11px; color: var(--color-ink-soft); letter-spacing: 0.2em; }
@keyframes scrollPulse { 0%, 100% { opacity: .3; } 50% { opacity: 1; } }

/* ===== 通用区段 ===== */
.section { padding: 100px 0; }
.section-head { max-width: 720px; margin-bottom: 56px; }
.section-head.light { margin-left: auto; margin-right: auto; text-align: center; }
.section-tag {
    display: inline-block; padding: 6px 14px; margin-bottom: 16px;
    background: rgba(245, 166, 35, 0.12); color: var(--color-honey-dark);
    border-radius: 999px; font-size: 12px; font-weight: 700; letter-spacing: 0.1em;
}
.section-title {
    margin: 0 0 16px; font-size: clamp(28px, 4vw, 42px); font-weight: 800;
    line-height: 1.2; color: var(--color-ink); letter-spacing: -0.01em;
}
.section-head.light .section-title { color: #faf9f5; }
.section-sub { margin: 0; font-size: 17px; color: var(--color-ink-soft); }

/* ===== 关于我们 ===== */
.about { background: var(--color-warm); }
.about-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: start; }
.about-text p { margin: 0 0 20px; font-size: 16px; color: var(--color-ink-soft); }
.about-text .hl { color: var(--color-honey-dark); font-weight: 700; }
.about-card { display: flex; flex-direction: column; gap: 16px; }
.about-card-item {
    background: var(--color-paper); border: 1px solid var(--color-line);
    border-radius: var(--radius-md); padding: 24px 28px;
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.about-card-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.about-card-item .card-num { font-size: 13px; font-weight: 800; color: var(--color-honey); letter-spacing: 0.1em; margin-bottom: 8px; }
.about-card-item h3 { margin: 0 0 6px; font-size: 18px; font-weight: 700; color: var(--color-ink); }
.about-card-item p { margin: 0; font-size: 14px; color: var(--color-ink-soft); }

/* ===== 核心技术 ===== */
.tech { background: var(--color-paper); }
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tech-card {
    background: var(--color-warm); border: 1px solid var(--color-line);
    border-radius: var(--radius-lg); padding: 36px 30px;
    transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
    position: relative; overflow: hidden;
}
.tech-card::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--color-honey), var(--color-honey-light));
    transform: scaleX(0); transform-origin: left; transition: transform .4s var(--ease);
}
.tech-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(245,166,35,0.4); }
.tech-card:hover::before { transform: scaleX(1); }
.tech-card.featured { background: var(--color-ink); border-color: var(--color-ink); }
.tech-card.featured h3, .tech-card.featured .tech-icon { color: #faf9f5; }
.tech-card.featured p { color: rgba(250,249,245,0.75); }
.tech-card.featured::before { background: linear-gradient(90deg, var(--color-honey), var(--color-honey-dark)); }
.tech-icon { margin-bottom: 24px; display: flex; }
.tech-card h3 { margin: 0 0 12px; font-size: 22px; font-weight: 800; color: var(--color-ink); }
.tech-card p { margin: 0; font-size: 15px; color: var(--color-ink-soft); }

/* ===== 数据实力（深色区） ===== */
.stats {
    background: var(--color-dark); color: #faf9f5;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(245,166,35,0.18), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(245,166,35,0.12), transparent 50%);
}
.stats .section-tag { background: rgba(245,166,35,0.16); color: var(--color-honey); }
.stats-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    margin-top: 24px; margin-bottom: 40px;
}
.stat-item {
    text-align: center; padding: 40px 24px;
    border: 1px solid rgba(245,166,35,0.18); border-radius: var(--radius-lg);
    background: rgba(255,255,255,0.02);
    transition: border-color .3s, background .3s;
}
.stat-item:hover { border-color: var(--color-honey); background: rgba(245,166,35,0.05); }
.stat-num {
    font-size: clamp(48px, 7vw, 76px); font-weight: 900;
    background: linear-gradient(120deg, var(--color-honey-light), var(--color-honey));
    -webkit-background-clip: text; background-clip: text; color: transparent;
    line-height: 1; margin-bottom: 12px;
}
.stat-label { font-size: 15px; color: rgba(250,249,245,0.7); letter-spacing: 0.04em; }
.stats-note { text-align: center; max-width: 760px; margin: 0 auto; color: rgba(250,249,245,0.6); font-size: 15px; }

/* ===== 核心优势 ===== */
.advantage { background: var(--color-warm); }
.advantage-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 56px; }
.adv-item {
    background: var(--color-paper); border: 1px solid var(--color-line);
    border-radius: var(--radius-md); padding: 32px;
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.adv-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.adv-num { font-size: 14px; font-weight: 800; color: var(--color-honey); letter-spacing: 0.1em; margin-bottom: 10px; }
.adv-item h3 { margin: 0 0 10px; font-size: 22px; font-weight: 800; color: var(--color-ink); }
.adv-item p { margin: 0; font-size: 15px; color: var(--color-ink-soft); }
.cta-band {
    display: flex; align-items: center; justify-content: space-between; gap: 32px;
    background: linear-gradient(120deg, var(--color-ink) 0%, #2a2a28 100%);
    color: #faf9f5; border-radius: var(--radius-lg); padding: 40px 48px;
    position: relative; overflow: hidden;
}
.cta-band::after {
    content: ""; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px;
    background: radial-gradient(circle, rgba(245,166,35,0.35), transparent 70%);
}
.cta-text { position: relative; z-index: 1; }
.cta-text h3 { margin: 0 0 6px; font-size: 24px; font-weight: 800; }
.cta-text p { margin: 0; color: rgba(250,249,245,0.7); font-size: 15px; }

/* ===== 联系我们 ===== */
.contact { background: var(--color-paper); }
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
    display: flex; flex-direction: column; gap: 6px;
    padding-bottom: 20px; border-bottom: 1px dashed var(--color-line);
}
.contact-item:last-child { border-bottom: none; }
.contact-label { font-size: 12px; color: var(--color-honey-dark); font-weight: 700; letter-spacing: 0.1em; }
.contact-value { font-size: 17px; color: var(--color-ink); font-weight: 500; }
.contact-form {
    background: var(--color-warm); border: 1px solid var(--color-line);
    border-radius: var(--radius-lg); padding: 32px;
}
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 13px; font-weight: 600; color: var(--color-ink-soft); margin-bottom: 8px; }
.form-row input, .form-row textarea {
    width: 100%; padding: 12px 16px; font-family: inherit; font-size: 15px;
    background: var(--color-paper); border: 1px solid var(--color-line);
    border-radius: var(--radius-sm); color: var(--color-ink); transition: border-color .2s, box-shadow .2s;
    resize: vertical;
}
.form-row input:focus, .form-row textarea:focus {
    outline: none; border-color: var(--color-honey);
    box-shadow: 0 0 0 3px rgba(245,166,35,0.15);
}
.form-tip { margin: 12px 0 0; font-size: 14px; min-height: 20px; color: var(--color-honey-dark); }

/* ===== 页脚 ===== */
.footer { background: var(--color-dark); color: rgba(250,249,245,0.7); }
.footer-top {
    display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
    padding-top: 64px; padding-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .brand-zh { color: #faf9f5; }
.footer-desc { margin: 0; max-width: 320px; font-size: 14px; line-height: 1.7; color: rgba(250,249,245,0.55); }
.footer-col h4 { margin: 0 0 16px; font-size: 14px; font-weight: 700; color: #faf9f5; letter-spacing: 0.05em; }
.footer-col a, .footer-col span { display: block; margin-bottom: 10px; font-size: 14px; color: rgba(250,249,245,0.6); transition: color .2s; }
.footer-col a:hover { color: var(--color-honey); }

/* 备案信息区 */
.footer-beian { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0 24px; }
.beian-wrap {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 20px;
    font-size: 13px; color: rgba(250,249,245,0.55);
}
.beian-item { margin: 0; }
.beian-link {
    display: inline-flex; align-items: center; gap: 6px;
    color: rgba(250,249,245,0.65); transition: color .2s;
}
.beian-link:hover { color: var(--color-honey); }
.beian-police { gap: 8px; }
.police-badge {
    display: inline-flex; align-items: center; justify-content: center;
    width: 20px; height: 20px; background: #c8a45c; border-radius: 4px;
}
.police-badge svg { width: 14px; height: 14px; }

/* ===== 滚动入场动画 ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.delay-1 { transition-delay: .12s; }
.reveal.delay-2 { transition-delay: .24s; }
.reveal.delay-3 { transition-delay: .36s; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .tech-grid { grid-template-columns: 1fr; }
    .advantage-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
    .cta-band { flex-direction: column; text-align: center; padding: 32px; }
}
@media (max-width: 720px) {
    .logo-img { width: 38px; height: 38px; }

    .section { padding: 64px 0; }
    .nav { display: none; position: absolute; top: 72px; left: 0; right: 0;
           flex-direction: column; background: var(--color-warm);
           border-bottom: 1px solid var(--color-line); padding: 16px 24px; gap: 4px; }
    .nav.open { display: flex; }
    .nav-link { padding: 12px 16px; }
    .nav-toggle { display: flex; }
    .stats-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .beian-wrap { flex-direction: column; gap: 8px; text-align: center; }
    .hero { min-height: 88vh; }
    .hero-actions .btn { flex: 1; }
}

/* 尊重用户的动效偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    html { scroll-behavior: auto; }
}