/* 虹熵低碳官网 - 深蓝工业科技风 · 简洁大气 */
:root {
  --navy: #0a1e30;
  --navy-2: #10293f;
  --navy-3: #16344f;
  --accent: #17b5a0;
  --accent-dim: rgba(23, 181, 160, .14);
  --ink: #17222e;
  --muted: #64748b;
  --line: #e3e8ee;
  --bg: #f5f7fa;
  --white: #ffffff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; color: var(--ink); background: var(--white); line-height: 1.75; font-size: 16px; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.small { font-size: .82rem; }

/* ===== 顶部导航 ===== */
.site-head { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.site-head.transparent { background: transparent; border-bottom: 1px solid rgba(255,255,255,.12); }
.site-head.transparent .logo-mark { color: #fff; }
.site-head.transparent .logo-sub { color: rgba(255,255,255,.55); }
.site-head.transparent .nav-links a { color: rgba(255,255,255,.82); }
.head-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; flex-direction: column; line-height: 1.2; }
.logo-mark { font-size: 1.3rem; font-weight: 700; letter-spacing: .12em; color: var(--navy); }
.logo-sub { font-size: .6rem; letter-spacing: .18em; color: var(--muted); }
.nav-links { display: flex; gap: 36px; }
.nav-links a { font-size: .95rem; color: var(--ink); opacity: .78; transition: opacity .2s; position: relative; padding: 6px 0; }
.nav-links a:hover, .nav-links a.active { opacity: 1; }
.nav-links a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--accent); border-radius: 2px; }
.nav-burger { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-burger span { display: block; width: 22px; height: 2px; background: currentColor; color: var(--ink); margin: 5px 0; border-radius: 2px; }
.site-head.transparent .nav-burger span { color: #fff; }

/* ===== Hero ===== */
.hero { position: relative; min-height: 88vh; display: flex; align-items: center; color: #fff; background: linear-gradient(135deg, #081726 0%, #0a1e30 45%, #123349 100%); overflow: hidden; margin-top: -72px; padding-top: 72px; }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px); background-size: 64px 64px; }
.hero-glow { position: absolute; right: -160px; top: -120px; width: 640px; height: 640px; border-radius: 50%; background: radial-gradient(circle, rgba(23,181,160,.22) 0%, transparent 65%); }
.hero-inner { position: relative; z-index: 1; max-width: 760px; padding: 90px 0 110px; }
.hero-tag { display: inline-block; font-size: .8rem; letter-spacing: .3em; color: var(--accent); border: 1px solid rgba(23,181,160,.4); padding: 6px 16px; border-radius: 999px; margin-bottom: 28px; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 700; line-height: 1.28; letter-spacing: .02em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { margin-top: 24px; font-size: 1.08rem; color: rgba(255,255,255,.72); max-width: 560px; }
.hero-cta { margin-top: 44px; display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 34px; border-radius: 4px; font-size: .95rem; letter-spacing: .08em; transition: transform .2s, box-shadow .2s, background .2s; border: 1px solid transparent; cursor: pointer; }
.btn-solid { background: var(--accent); color: #04211c; font-weight: 600; }
.btn-solid:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(23,181,160,.35); }
.btn-ghost { border-color: rgba(255,255,255,.35); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.06); }

/* ===== 通用区块 ===== */
.section { padding: 96px 0; }
.section.alt { background: var(--bg); }
.sec-head { text-align: center; margin-bottom: 64px; }
.sec-head .kicker { display: inline-block; font-size: .78rem; letter-spacing: .32em; color: var(--accent); margin-bottom: 14px; }
.sec-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 700; letter-spacing: .04em; color: var(--navy); }
.sec-head p { margin-top: 14px; color: var(--muted); max-width: 640px; margin-left: auto; margin-right: auto; }
.sec-line { width: 44px; height: 3px; background: var(--accent); margin: 18px auto 0; border-radius: 2px; }

/* 三卡业务 */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 40px 34px; transition: transform .25s, box-shadow .25s; }
.card:hover { transform: translateY(-6px); box-shadow: 0 18px 44px rgba(10,30,48,.1); }
.card .no { font-size: .8rem; color: var(--accent); letter-spacing: .2em; font-weight: 600; }
.card h3 { margin: 14px 0 12px; font-size: 1.18rem; color: var(--navy); }
.card p { color: var(--muted); font-size: .94rem; }

/* 流程四步 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.step { padding: 0 28px; position: relative; }
.step + .step { border-left: 1px solid var(--line); }
.step .num { font-size: 2.4rem; font-weight: 700; color: var(--accent-dim); -webkit-text-stroke: 1px var(--accent); color: transparent; line-height: 1; }
.step h4 { margin: 18px 0 10px; font-size: 1.05rem; color: var(--navy); }
.step p { font-size: .9rem; color: var(--muted); }

/* 数据条 */
.stats-band { background: var(--navy); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); text-align: center; padding: 56px 0; }
.stat b { display: block; font-size: 2.3rem; font-weight: 700; color: var(--accent); letter-spacing: .02em; }
.stat span { font-size: .88rem; color: rgba(255,255,255,.6); letter-spacing: .1em; }

/* 产品页 */
.prod { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 72px 0; }
.prod + .prod { border-top: 1px solid var(--line); }
.prod .visual { aspect-ratio: 16/10; border-radius: 8px; background: linear-gradient(135deg, #0e2a40, #14485c); position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.prod .visual .glyph { color: rgba(255,255,255,.9); font-size: 3rem; letter-spacing: .1em; }
.prod .visual::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px); background-size: 40px 40px; }
.prod .tag { font-size: .78rem; color: var(--accent); letter-spacing: .24em; }
.prod h3 { font-size: 1.5rem; color: var(--navy); margin: 12px 0 16px; }
.prod p { color: var(--muted); font-size: .96rem; }
.prod ul { margin-top: 18px; list-style: none; }
.prod ul li { padding-left: 22px; position: relative; color: var(--ink); font-size: .94rem; margin-bottom: 8px; }
.prod ul li::before { content: ""; position: absolute; left: 0; top: .62em; width: 8px; height: 8px; background: var(--accent); border-radius: 2px; }
.prod .note { margin-top: 14px; font-size: .8rem; color: var(--muted); }

/* 新闻 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card { background: var(--white); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; display: flex; flex-direction: column; transition: transform .25s, box-shadow .25s; }
.news-card:hover { transform: translateY(-5px); box-shadow: 0 16px 40px rgba(10,30,48,.09); }
.news-card .body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.news-card .date { font-size: .78rem; color: var(--accent); letter-spacing: .14em; }
.news-card h3 { margin: 12px 0 10px; font-size: 1.05rem; color: var(--navy); line-height: 1.5; }
.news-card p { font-size: .9rem; color: var(--muted); flex: 1; }
.article { max-width: 780px; margin: 0 auto; }
.article .date { color: var(--accent); font-size: .85rem; letter-spacing: .14em; }
.article h1 { font-size: 1.7rem; color: var(--navy); margin: 14px 0 8px; line-height: 1.45; }
.article .content { margin-top: 36px; font-size: 1rem; color: #33414f; white-space: pre-wrap; }
.back-link { display: inline-block; margin-top: 48px; color: var(--accent); font-size: .92rem; }

/* 关于页 */
.about-block { max-width: 820px; margin: 0 auto; }
.about-block h3 { color: var(--navy); font-size: 1.25rem; margin: 44px 0 14px; padding-left: 14px; border-left: 3px solid var(--accent); }
.about-block p { color: #33414f; }
.timeline { margin-top: 24px; border-left: 1px solid var(--line); padding-left: 28px; }
.tl-item { position: relative; padding-bottom: 26px; }
.tl-item::before { content: ""; position: absolute; left: -33px; top: 8px; width: 11px; height: 11px; border-radius: 50%; background: var(--white); border: 2px solid var(--accent); }
.tl-item .yr { font-weight: 700; color: var(--navy); }
.tl-item p { color: var(--muted); font-size: .93rem; }
.license-box { margin-top: 44px; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 30px 34px; font-size: .88rem; }
.license-box dl { display: grid; grid-template-columns: 150px 1fr; gap: 10px 18px; }
.license-box dt { color: var(--muted); }
.license-box dd { color: var(--ink); }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; }
.contact-info h3 { color: var(--navy); font-size: 1.2rem; margin-bottom: 20px; }
.contact-info .row { margin-bottom: 22px; }
.contact-info .row .lb { font-size: .78rem; letter-spacing: .2em; color: var(--accent); margin-bottom: 4px; }
.contact-info .row .vl { color: var(--ink); }
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 40px; }
.form-card h3 { color: var(--navy); font-size: 1.2rem; margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: .86rem; color: var(--muted); margin-bottom: 6px; }
.field input, .field textarea, .field select { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 4px; font-size: .95rem; font-family: inherit; background: var(--bg); transition: border .2s; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.alert { padding: 13px 18px; border-radius: 4px; font-size: .9rem; margin-bottom: 20px; }
.alert-ok { background: #e6f6f0; color: #0c6e4c; border: 1px solid #b8e3d2; }
.alert-err { background: #fdeeee; color: #a33030; border: 1px solid #f3caca; }

/* CTA 条 */
.cta-band { background: linear-gradient(120deg, #0a1e30, #12384f); color: #fff; text-align: center; }
.cta-band .inner { padding: 84px 0; }
.cta-band h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: .04em; }
.cta-band p { margin-top: 12px; color: rgba(255,255,255,.66); }

/* 页脚 */
.site-foot { background: #071522; color: #cfe0ea; padding: 72px 0 0; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 48px; padding-bottom: 48px; }
.foot-name { font-size: 1.25rem; font-weight: 700; letter-spacing: .1em; color: #fff; }
.foot-col { display: flex; flex-direction: column; gap: 8px; }
.foot-col h4 { color: #fff; font-size: .95rem; letter-spacing: .12em; margin-bottom: 6px; }
.foot-col a { font-size: .88rem; color: #9db4c4; transition: color .2s; }
.foot-col a:hover { color: var(--accent); }
.foot-col span { font-size: .88rem; color: #9db4c4; }
.foot-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 22px; padding-bottom: 26px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.site-foot .muted { color: #8296a5; }

/* ===== 后台 ===== */
.admin-body { background: var(--bg); min-height: 100vh; }
.admin-head { background: var(--navy); color: #fff; }
.admin-head .head-inner { height: 60px; }
.admin-head .logo-mark { color: #fff; font-size: 1.1rem; }
.admin-head .nav-links a { color: rgba(255,255,255,.75); font-size: .88rem; }
.admin-head .nav-links a:hover, .admin-head .nav-links a.active { color: #fff; opacity: 1; }
.admin-main { padding: 40px 0 80px; }
.stat-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 40px; }
.stat-cards .sc { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 24px; }
.stat-cards .sc b { font-size: 1.9rem; color: var(--navy); }
.stat-cards .sc span { display: block; color: var(--muted); font-size: .85rem; margin-top: 4px; }
.admin-panel { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 32px; margin-bottom: 28px; }
.admin-panel h3 { color: var(--navy); margin-bottom: 20px; font-size: 1.1rem; }
table.tb { width: 100%; border-collapse: collapse; font-size: .92rem; }
table.tb th { text-align: left; padding: 10px 12px; background: var(--bg); color: var(--muted); font-weight: 500; border-bottom: 1px solid var(--line); }
table.tb td { padding: 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.tb tr:hover td { background: #fafbfd; }
.mini-btn { display: inline-block; padding: 5px 14px; font-size: .8rem; border-radius: 4px; border: 1px solid var(--line); background: var(--white); color: var(--ink); cursor: pointer; }
.mini-btn.danger { color: #a33030; border-color: #f3caca; }
.mini-btn:hover { border-color: var(--accent); color: var(--accent); }
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #081726, #123349); padding: 24px; }
.login-card { width: 400px; max-width: 100%; background: var(--white); border-radius: 10px; padding: 44px 40px; }
.login-card h1 { font-size: 1.35rem; color: var(--navy); text-align: center; margin-bottom: 6px; }
.login-card .sub { text-align: center; color: var(--muted); font-size: .84rem; margin-bottom: 28px; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .cards-3, .news-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; gap: 32px; }
  .step + .step { border-left: 0; }
  .prod { grid-template-columns: 1fr; gap: 32px; padding: 48px 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .stat-cards { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr; gap: 20px; }
  .nav-burger { display: block; }
  .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--navy); flex-direction: column; gap: 0; padding: 12px 0; }
  .site-head.transparent .nav-links { background: var(--navy); }
  .nav-links a { color: #fff !important; padding: 13px 28px; opacity: .85; }
  .nav-links a.active { background: rgba(255,255,255,.06); }
  .nav-links.open { display: flex; }
  .hero { min-height: 76vh; }
  .section { padding: 64px 0; }
  .license-box dl { grid-template-columns: 1fr; }
}