/* ============================================================
   全局样式 - global.css
   包含：CSS变量、全局重置、通用按钮、区块标题、顶部导航、页脚、响应式
============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --green-50:  #ecfdf3;
    --green-100: #d3f8e0;
    --green-200: #a9efc5;
    --green-300: #6ce9a6;
    --green-400: #32d583;
    --green-500: #16b364;
    --green-600: #099250;
    --green-700: #087443;
    --green-800: #095c37;
    --green-900: #084c2e;
    --ink:       #0d1f17;
    --ink-soft:  #34483c;
    --muted:     #6b7a70;
    --muted-2:   #98a69e;
    --line:      #e7efe9;
    --bg-soft:   #f5faf7;
    --white:     #ffffff;
    --shadow-sm: 0 1px 2px rgba(13,31,23,.05), 0 2px 8px rgba(13,31,23,.05);
    --shadow-md: 0 8px 24px rgba(13,31,23,.08);
    --shadow-lg: 0 24px 60px rgba(13,31,23,.16);
    --radius-sm: 10px;
    --radius:    16px;
    --radius-lg: 24px;
    --grad: linear-gradient(135deg, #16b364 0%, #099250 60%, #095c37 100%);
    --grad-soft: linear-gradient(135deg, #ecfdf3, #d3f8e0);
    --font-display: "AlibabaPuHuiTi-2-85-Bold", "AlibabaPuHuiTi-2-55-Regular", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-body: "AlibabaPuHuiTi-2-55-Regular", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ---------- 全局重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; overflow-x: hidden; }
body {
    font-family: var(--font-body);
    color: var(--ink);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    font-weight: 700; font-size: 17px; padding: 15px 34px; border-radius: 999px;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease, letter-spacing .3s ease;
    cursor: pointer; white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; transition: transform .25s ease; }
.btn:hover svg { transform: translateX(3px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px rgba(9,146,80,.32); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(9,146,80,.4); }
.btn-light { background: #fff; color: var(--green-700); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(0,0,0,.22); }
.btn-ghost { border: 1.5px solid rgba(255,255,255,.65); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); transform: translateY(-2px); }
.btn-outline { border: 1.5px solid var(--green-300); color: var(--green-700); background: #fff; }
.btn-outline:hover { background: var(--green-50); transform: translateY(-2px); }

/* ---------- 区块标题 ---------- */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--font-display); font-size: 13px; font-weight: 700;
    letter-spacing: 3px; text-transform: uppercase; color: var(--green-600);
    background: var(--green-50); border: 1px solid var(--green-100);
    padding: 8px 20px; border-radius: 999px; margin-bottom: 20px;
}
.section-head .eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--green-500); animation: pulse 2s infinite; }
.section-head h2 { font-size: clamp(32px, 4.5vw, 46px); font-weight: 800; letter-spacing: .5px; line-height: 1.25; }
.section-head h2::after { content: ""; display: block; width: 48px; height: 4px; background: var(--grad); border-radius: 99px; margin: 16px auto 0; }
.section-head p { color: var(--muted); margin-top: 16px; font-size: 18px; }

/* ============================================================
   顶部导航
============================================================ */
header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    --hdr-bg: transparent;
    --hdr-fg: #fff;
    --hdr-sub: rgba(255,255,255,.7);
    --hdr-link: rgba(255,255,255,.86);
    --hdr-link-active: #fff;
    background: var(--hdr-bg);
    transition: background .3s ease, box-shadow .3s ease;
    border-bottom: 1px solid transparent;
}
header.scrolled {
    --hdr-bg: rgba(255,255,255,.86);
    --hdr-fg: var(--ink);
    --hdr-sub: var(--muted);
    --hdr-link: var(--ink-soft);
    --hdr-link-active: var(--green-600);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    box-shadow: 0 1px 0 rgba(13,31,23,.06), 0 10px 30px rgba(13,31,23,.06);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 94px; }
.brand { display: flex; align-items: center; text-decoration: none; }
.brand-img {
    height: 62px; width: auto;
    display: block; object-fit: contain;
}
.nav-right { display: flex; align-items: center; gap: 26px; }
.menu { display: flex; gap: 30px; font-size: 16px; font-weight: 500; }
.menu a { color: var(--hdr-link); padding: 8px 0; position: relative; transition: color .2s; }
.menu a::after {
    content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
    background: var(--green-400); border-radius: 2px; transition: width .25s ease;
}
header.scrolled .menu a::after { background: var(--green-500); }
.menu a:hover, .menu a.active { color: var(--hdr-link-active); }
.menu a:hover::after, .menu a.active::after { width: 100%; }
.nav-btn { padding: 11px 24px; font-size: 14px; }
.menu-toggle {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px; z-index: 202;
}
.menu-toggle span { width: 22px; height: 2px; background: var(--hdr-fg); border-radius: 2px; transition: transform .25s, opacity .2s, background .3s; }
.menu-toggle.open span { background: var(--ink); }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   页脚
============================================================ */
footer { background: #0a1c14; color: #a9b9b0; font-size: 16px; }
.footer-inner {
    display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 44px 48px;
    padding: 66px 24px 50px; align-items: start;
}
.footer-brand .brand-mark { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.brand-mark img { height: 44px; width: auto; object-fit: contain; }
.footer-brand > p { color: #7f9188; font-size: 15px; max-width: 260px; }
.footer-qr { display: flex; gap: 12px; margin-top: 18px; }
.qr {
    width: 100px; background: #12241b; border: 1px solid #1f3a2c;
    display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 6px;
    padding: 8px; color: #6f8278; font-size: 11px; text-align: center;
    transition: border-color .3s, background .3s;
}
.qr:hover { border-color: var(--green-700); background: #1a3526; }
.qr img { width: 84px; height: 84px; object-fit: cover; }
.footer-col h4 { color: #fff; font-size: 17px; margin-bottom: 20px; font-weight: 700; }
.footer-col li { margin-bottom: 12px; }
.footer-col li a { color: #a9b9b0; transition: color .2s, padding-left .2s; }
.footer-col li a:hover { color: var(--green-400); padding-left: 4px; }
.footer-col .contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-col .contact svg { width: 16px; height: 16px; color: var(--green-400); flex: none; margin-top: 4px; }
.copyright { border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0; text-align: center; font-size: 14px; color: #6f8278; }
.copyright a { color: #BBBBBC; font-size: 12px; line-height: 18px; }
.copyright a:hover { color: var(--green-400); }

/* ---------- 回到顶部 ---------- */
.to-top {
    position: fixed; right: 26px; bottom: 26px; width: 48px; height: 48px; border-radius: 50%;
    background: var(--grad); color: #fff; border: none; cursor: pointer; z-index: 90;
    display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-lg);
    opacity: 0; visibility: hidden; transform: translateY(10px); transition: opacity .3s, transform .3s, visibility .3s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top svg { width: 20px; height: 20px; }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* ---------- 脉冲动画 ---------- */
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(108,233,166,.6); }
    70% { box-shadow: 0 0 0 12px rgba(108,233,166,0); }
    100% { box-shadow: 0 0 0 0 rgba(108,233,166,0); }
}

/* ============================================================
   响应式 - 通用部分（header/footer/按钮/容器）
============================================================ */
@media (max-width: 960px) {
    .nav-btn { display: none; }
    .menu-toggle { display: flex; }
    .menu {
        position: fixed; top: 0; right: 0; bottom: 0; width: 280px;
        background: #fff; flex-direction: column; gap: 0; padding: 90px 28px 30px;
        box-shadow: -20px 0 60px rgba(13,31,23,.18); transform: translateX(100%);
        transition: transform .3s ease; z-index: 200;
    }
    .menu.open { transform: none; }
    .menu-overlay {
        display: none; position: fixed; inset: 0; z-index: 199;
        background: rgba(0,0,0,.5);
    }
    .menu-overlay.show { display: block; }
    body.menu-lock { overflow: hidden; position: fixed; width: 100%; }
    .menu a { display: block; padding: 15px 0; font-size: 17px; border-bottom: 1px solid var(--line); color: var(--ink-soft); }
    .menu a:hover, .menu a.active { color: var(--green-600); }
    .menu a::after { display: none; }
    .footer-inner { grid-template-columns: repeat(2, 1fr); gap: 36px 28px; }
}

@media (max-width: 768px) {
    .nav { height: 72px; }
    .brand-img { height: 48px; }
    html { scroll-padding-top: 80px; }
    .section-head h2 { font-size: clamp(26px, 6vw, 34px); }
    .section-head p { font-size: 16px; }
    .btn { font-size: 15px; padding: 13px 26px; }
}

@media (max-width: 560px) {
    .container { padding: 0 20px; }
    .nav { height: 64px; }
    .brand-img { height: 42px; }
    .menu { padding-top: 80px; width: 260px; }
    html { scroll-padding-top: 72px; }
    .section-head { margin-bottom: 40px; }
    .section-head .eyebrow { font-size: 12px; padding: 7px 16px; }
    .section-head h2::after { width: 40px; height: 3px; margin-top: 14px; }
    .footer-inner { grid-template-columns: 1fr; gap: 28px; padding: 44px 18px 32px; }
    .to-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
}