/* ======================================================================
   广西橙智科技有限公司 · 官网样式
   深色科技风 · 品牌橙 #FF6A13
   ====================================================================== */

:root{
  --bg:        #16181D;
  --bg-2:      #1B1E25;
  --bg-3:      #21252E;
  --card:      #1E222A;
  --card-hi:   #262B35;

  --orange:    #FF6A13;
  --orange-2:  #FF8A3D;
  --orange-deep:#E85600;
  --orange-soft: rgba(255,106,19,.14);

  --text:      #F3F4F6;
  --text-2:    #C7CCD6;
  --muted:     #9AA1AF;
  --line:      rgba(255,255,255,.08);
  --line-2:    rgba(255,255,255,.14);

  --radius:    16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --maxw:      1200px;
  --shadow:    0 20px 50px -20px rgba(0,0,0,.7);
  --glow:      0 0 60px -10px rgba(255,106,19,.45);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:16px;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{ color:inherit; text-decoration:none; transition:color .2s ease; }
img{ max-width:100%; display:block; }
ul{ list-style:none; }
::selection{ background:var(--orange); color:#fff; }

/* ---------- Layout ---------- */
.container{ width:100%; max-width:var(--maxw); margin:0 auto; padding:0 24px; }
.section{ padding:96px 0; position:relative; }
.section--tight{ padding:64px 0; }
.section-head{ max-width:720px; margin:0 0 56px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size:13px; font-weight:600; letter-spacing:.14em;
  color:var(--orange-2); text-transform:uppercase;
  padding:6px 14px; border:1px solid var(--line-2); border-radius:999px;
  background:var(--orange-soft); margin-bottom:20px;
}
.eyebrow::before{ content:""; width:6px; height:6px; border-radius:50%; background:var(--orange); box-shadow:0 0 10px var(--orange); }
h1,h2,h3,h4{ line-height:1.25; font-weight:700; letter-spacing:.01em; }
.section-title{ font-size:clamp(28px,4vw,42px); margin-bottom:18px; }
.section-sub{ color:var(--muted); font-size:17px; }

.grad-text{
  background:linear-gradient(100deg,var(--orange-2),var(--orange) 55%,var(--orange-deep));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

/* ---------- Decorative backgrounds ---------- */
.bg-grid{
  position:absolute; inset:0; z-index:0; pointer-events:none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 80%);
  opacity:.5;
}
.glow{ position:absolute; border-radius:50%; filter:blur(90px); opacity:.5; z-index:0; pointer-events:none; }
.glow--orange{ background:radial-gradient(circle, rgba(255,106,19,.55), transparent 70%); }
.glow--amber{ background:radial-gradient(circle, rgba(255,150,60,.35), transparent 70%); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px; cursor:pointer;
  font-family:inherit; font-size:15px; font-weight:600;
  padding:13px 26px; border-radius:999px; border:1px solid transparent;
  transition:transform .18s ease, box-shadow .25s ease, background .2s ease, border-color .2s;
  white-space:nowrap;
}
.btn:active{ transform:translateY(1px); }
.btn--primary{
  background:linear-gradient(100deg,var(--orange),var(--orange-deep));
  color:#fff; box-shadow:0 10px 30px -8px rgba(255,106,19,.6);
}
.btn--primary:hover{ transform:translateY(-2px); box-shadow:0 16px 40px -8px rgba(255,106,19,.75); }
.btn--ghost{ background:transparent; color:var(--text); border-color:var(--line-2); }
.btn--ghost:hover{ border-color:var(--orange); color:var(--orange-2); background:var(--orange-soft); }
.btn--lg{ padding:16px 34px; font-size:16px; }
.btn .arw{ transition:transform .2s ease; }
.btn:hover .arw{ transform:translateX(4px); }

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  background:rgba(22,24,29,.72);
  border-bottom:1px solid transparent;
  transition:border-color .3s, background .3s;
}
.site-header.scrolled{ border-bottom-color:var(--line); background:rgba(20,22,27,.9); }
.nav{ display:flex; align-items:center; justify-content:space-between; height:72px; }
.brand{ display:flex; align-items:center; gap:12px; font-weight:700; font-size:18px; }
.brand img{ height:38px; width:auto; filter:drop-shadow(0 4px 12px rgba(255,106,19,.3)); }
.brand .brand-name{ letter-spacing:.02em; }
.brand .brand-name b{ color:var(--orange-2); font-weight:700; }
.nav-links{ display:flex; align-items:center; gap:6px; }
.nav-links a{
  padding:8px 16px; border-radius:999px; font-size:15px; color:var(--text-2);
  font-weight:500; transition:color .2s, background .2s;
}
.nav-links a:hover{ color:var(--text); background:rgba(255,255,255,.05); }
.nav-links a.active{ color:var(--orange-2); background:var(--orange-soft); }
.nav-cta{ margin-left:14px; }
.nav-toggle{ display:none; background:none; border:1px solid var(--line-2); border-radius:10px;
  width:44px; height:40px; color:var(--text); cursor:pointer; align-items:center; justify-content:center; }
.nav-toggle svg{ width:22px; height:22px; }

/* ---------- Hero ---------- */
.hero{ position:relative; padding:120px 0 100px; overflow:hidden; }
.hero .glow--orange{ width:640px; height:640px; top:-260px; right:-120px; }
.hero .glow--amber{ width:420px; height:420px; bottom:-200px; left:-140px; }
.hero-inner{ position:relative; z-index:2; max-width:880px; }
.hero h1{
  font-size:clamp(34px,6vw,62px); line-height:1.15; letter-spacing:.005em;
  margin-bottom:26px; font-weight:800;
}
.hero .sub{ font-size:clamp(16px,2.2vw,20px); color:var(--text-2); max-width:680px; margin-bottom:16px; }
.hero .chain{
  display:flex; flex-wrap:wrap; gap:10px; align-items:center; margin:28px 0 38px;
  color:var(--muted); font-size:15px;
}
.hero .chain b{ color:var(--orange-2); font-weight:600; }
.chain .sep{ color:var(--orange); opacity:.7; }
.hero-actions{ display:flex; flex-wrap:wrap; gap:14px; }
.hero-badges{ display:flex; flex-wrap:wrap; gap:26px; margin-top:56px; }
.hero-badges .hb{ }
.hero-badges .hb b{ display:block; font-size:30px; font-weight:800; color:var(--text);
  background:linear-gradient(120deg,#fff,var(--orange-2)); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.hero-badges .hb span{ color:var(--muted); font-size:14px; }

/* ---------- Feature / service cards ---------- */
.grid{ display:grid; gap:22px; }
.grid-2{ grid-template-columns:repeat(2,1fr); }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }

.card{
  position:relative; background:linear-gradient(180deg,var(--card),var(--bg-2));
  border:1px solid var(--line); border-radius:var(--radius);
  padding:30px; transition:transform .25s ease, border-color .25s, box-shadow .25s;
  overflow:hidden; z-index:1;
}
.card::before{
  content:""; position:absolute; inset:0; border-radius:inherit; padding:1px;
  background:linear-gradient(140deg, rgba(255,106,19,.5), transparent 45%);
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor; mask-composite:exclude;
  opacity:0; transition:opacity .3s;
}
.card:hover{ transform:translateY(-6px); border-color:var(--line-2); box-shadow:var(--shadow); }
.card:hover::before{ opacity:1; }
.card .ico{
  width:54px; height:54px; border-radius:14px; display:flex; align-items:center; justify-content:center;
  background:var(--orange-soft); border:1px solid var(--line-2); margin-bottom:20px; color:var(--orange-2);
}
.card .ico svg{ width:28px; height:28px; }
.card h3{ font-size:20px; margin-bottom:10px; }
.card .num{ font-size:13px; font-weight:700; color:var(--orange); letter-spacing:.1em; margin-bottom:14px; display:block; }
.card p{ color:var(--muted); font-size:15px; }
.card ul.feat{ margin-top:16px; display:flex; flex-direction:column; gap:8px; }
.card ul.feat li{ color:var(--text-2); font-size:14px; padding-left:22px; position:relative; }
.card ul.feat li::before{ content:""; position:absolute; left:0; top:9px; width:8px; height:8px;
  border-right:2px solid var(--orange); border-bottom:2px solid var(--orange); transform:rotate(45deg); }

.card--plan{ border-style:dashed; border-color:var(--line-2); background:transparent; }
.card--plan .ico{ background:transparent; }
.tag-plan{ position:absolute; top:18px; right:18px; font-size:12px; font-weight:600;
  color:var(--orange-2); border:1px solid var(--line-2); border-radius:999px; padding:3px 10px; background:var(--orange-soft); }

/* ---------- Process / steps ---------- */
.steps{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; counter-reset:step; }
.step{ position:relative; background:var(--bg-2); border:1px solid var(--line); border-radius:var(--radius);
  padding:32px 28px; }
.step .k{ font-size:14px; letter-spacing:.15em; color:var(--orange); font-weight:700; margin-bottom:16px; }
.step h3{ font-size:19px; margin-bottom:10px; }
.step p{ color:var(--muted); font-size:14.5px; }
.step .line{ position:absolute; top:44px; right:-11px; width:22px; height:2px; background:linear-gradient(90deg,var(--orange),transparent); }
.step:last-child .line{ display:none; }

/* ---------- Case cards ---------- */
.case-card{
  display:flex; flex-direction:column; background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); overflow:hidden; transition:transform .25s, border-color .25s, box-shadow .25s;
}
.case-card:hover{ transform:translateY(-6px); border-color:var(--line-2); box-shadow:var(--shadow); }
.case-media{ position:relative; aspect-ratio:16/10; overflow:hidden; background:var(--bg-3);
  border-bottom:1px solid var(--line); }
.case-media img{ width:100%; height:100%; object-fit:cover; object-position:top center; transition:transform .5s ease; }
.case-card:hover .case-media img{ transform:scale(1.05); }
.case-media .kbadge{ position:absolute; top:14px; left:14px; z-index:2; font-size:12px; font-weight:600;
  padding:5px 12px; border-radius:999px; background:rgba(22,24,29,.82); backdrop-filter:blur(6px);
  border:1px solid var(--line-2); color:var(--orange-2); }
.case-body{ padding:24px; display:flex; flex-direction:column; flex:1; }
.case-body h3{ font-size:20px; margin-bottom:10px; }
.case-body p{ color:var(--muted); font-size:14.5px; flex:1; }
.case-meta{ display:flex; flex-wrap:wrap; gap:8px; margin-top:18px; }
.chip{ font-size:12px; color:var(--text-2); border:1px solid var(--line); border-radius:999px;
  padding:4px 11px; background:var(--bg-3); }
.case-more{ margin-top:20px; color:var(--orange-2); font-weight:600; font-size:14.5px; display:inline-flex; align-items:center; gap:6px; }
.case-card:hover .case-more .arw{ transform:translateX(4px); }

/* abstract SVG visual inside case-media */
.case-media.abstract{ display:flex; align-items:center; justify-content:center;
  background:radial-gradient(120% 120% at 20% 0%, #23272F, #16181D 70%); }
.case-media.abstract svg{ width:100%; height:100%; }

/* ---------- Case detail ---------- */
.case-hero{ position:relative; padding:110px 0 60px; overflow:hidden; }
.case-hero .glow--orange{ width:520px; height:520px; top:-240px; right:-120px; }
.breadcrumb{ font-size:14px; color:var(--muted); margin-bottom:22px; position:relative; z-index:2; }
.breadcrumb a:hover{ color:var(--orange-2); }
.breadcrumb .sep{ margin:0 8px; opacity:.5; }
.case-hero h1{ font-size:clamp(30px,4.6vw,48px); max-width:900px; margin-bottom:20px; position:relative; z-index:2; }
.case-hero .lead{ font-size:18px; color:var(--text-2); max-width:760px; position:relative; z-index:2; }
.case-facts{ display:flex; flex-wrap:wrap; gap:14px; margin-top:30px; position:relative; z-index:2; }
.fact{ background:var(--bg-2); border:1px solid var(--line); border-radius:12px; padding:12px 18px; }
.fact span{ display:block; font-size:12px; color:var(--muted); margin-bottom:3px; }
.fact b{ font-size:15px; font-weight:600; color:var(--text); }

.case-layout{ display:grid; grid-template-columns:1fr 300px; gap:56px; align-items:start; }
.prose h2{ font-size:26px; margin:44px 0 16px; padding-left:16px; border-left:3px solid var(--orange); }
.prose h2:first-child{ margin-top:0; }
.prose h3{ font-size:18px; margin:26px 0 10px; color:var(--text); }
.prose p{ color:var(--text-2); margin-bottom:14px; }
.prose ul.bullets{ display:flex; flex-direction:column; gap:10px; margin:6px 0 18px; }
.prose ul.bullets li{ color:var(--text-2); padding-left:26px; position:relative; }
.prose ul.bullets li::before{ content:""; position:absolute; left:2px; top:10px; width:9px; height:9px;
  border-right:2px solid var(--orange); border-bottom:2px solid var(--orange); transform:rotate(45deg); }
.prose strong{ color:var(--text); }

.modules{ display:grid; grid-template-columns:repeat(2,1fr); gap:16px; margin:20px 0; }
.module{ background:var(--bg-2); border:1px solid var(--line); border-radius:12px; padding:20px; }
.module h4{ font-size:16px; margin-bottom:8px; color:var(--orange-2); }
.module p{ font-size:14px; color:var(--muted); margin:0; }

.arch{ background:var(--bg-2); border:1px solid var(--line); border-radius:var(--radius); padding:24px; margin:20px 0;
  font-size:14px; overflow-x:auto; }
.arch .flow{ display:flex; flex-wrap:wrap; align-items:center; gap:10px; }
.arch .node{ padding:10px 16px; border-radius:10px; background:var(--bg-3); border:1px solid var(--line-2);
  color:var(--text); white-space:nowrap; font-weight:500; }
.arch .node.hl{ border-color:var(--orange); color:var(--orange-2); background:var(--orange-soft); }
.arch .to{ color:var(--orange); font-weight:700; }

.side-card{ position:sticky; top:96px; background:var(--bg-2); border:1px solid var(--line);
  border-radius:var(--radius); padding:26px; }
.side-card h4{ font-size:16px; margin-bottom:16px; }
.side-card .kv{ margin-bottom:14px; }
.side-card .kv span{ display:block; font-size:12px; color:var(--muted); }
.side-card .kv b{ font-size:15px; font-weight:600; }
.side-card .btn{ width:100%; justify-content:center; margin-top:8px; }

.gallery{ display:grid; grid-template-columns:repeat(2,1fr); gap:16px; margin:26px 0; }
.gallery .shot{ border:1px solid var(--line); border-radius:12px; overflow:hidden; background:var(--bg-3); }
.gallery .shot img{ width:100%; height:100%; object-fit:cover; }
.gallery .shot.wide{ grid-column:1 / -1; }
.shot-frame{ background:var(--bg-2); border:1px solid var(--line); border-radius:14px; padding:12px; }
.shot-frame .bar{ display:flex; gap:6px; margin-bottom:10px; padding:2px 4px; }
.shot-frame .bar i{ width:11px; height:11px; border-radius:50%; background:#3a3f4a; display:inline-block; }
.shot-frame .bar i:first-child{ background:#ff5f57; } .shot-frame .bar i:nth-child(2){ background:#febc2e; } .shot-frame .bar i:nth-child(3){ background:#28c840; }
.shot-frame img{ border-radius:8px; width:100%; }
figcaption{ font-size:13px; color:var(--muted); margin-top:8px; text-align:center; }

/* quote */
.quote{ border-left:3px solid var(--orange); background:var(--orange-soft); border-radius:0 12px 12px 0;
  padding:18px 24px; margin:22px 0; font-size:17px; color:var(--text); }
.quote span{ display:block; font-size:13px; color:var(--muted); margin-top:8px; }

/* ---------- Timeline (roadmap) ---------- */
.timeline{ position:relative; max-width:820px; margin:0 auto; padding-left:34px; }
.timeline::before{ content:""; position:absolute; left:8px; top:6px; bottom:6px; width:2px;
  background:linear-gradient(180deg,var(--orange),rgba(255,106,19,.15)); }
.tl-item{ position:relative; padding:0 0 40px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{ content:""; position:absolute; left:-33px; top:4px; width:18px; height:18px; border-radius:50%;
  background:var(--bg); border:3px solid var(--orange); box-shadow:0 0 14px rgba(255,106,19,.6); }
.tl-item .stage{ font-size:13px; letter-spacing:.12em; color:var(--orange-2); font-weight:700; margin-bottom:6px; }
.tl-item h3{ font-size:20px; margin-bottom:8px; }
.tl-item p{ color:var(--muted); font-size:15px; }

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns:1fr 1fr; gap:40px; align-items:start; }
.info-list{ display:flex; flex-direction:column; gap:22px; }
.info-item{ display:flex; gap:16px; align-items:flex-start; }
.info-item .ico{ flex:0 0 46px; width:46px; height:46px; border-radius:12px; background:var(--orange-soft);
  border:1px solid var(--line-2); display:flex; align-items:center; justify-content:center; color:var(--orange-2); }
.info-item .ico svg{ width:22px; height:22px; }
.info-item .t{ font-size:13px; color:var(--muted); margin-bottom:2px; }
.info-item .v{ font-size:16px; color:var(--text); font-weight:500; word-break:break-word; }
.info-item .v a:hover{ color:var(--orange-2); }

.form{ background:var(--bg-2); border:1px solid var(--line); border-radius:var(--radius); padding:32px; }
.form .row{ margin-bottom:18px; }
.form label{ display:block; font-size:14px; color:var(--text-2); margin-bottom:8px; font-weight:500; }
.form label .req{ color:var(--orange); }
.form input, .form textarea{
  width:100%; background:var(--bg-3); border:1px solid var(--line-2); border-radius:10px;
  padding:13px 15px; color:var(--text); font-family:inherit; font-size:15px; transition:border-color .2s, box-shadow .2s;
}
.form input::placeholder, .form textarea::placeholder{ color:#6c7380; }
.form input:focus, .form textarea:focus{ outline:none; border-color:var(--orange); box-shadow:0 0 0 3px var(--orange-soft); }
.form textarea{ resize:vertical; min-height:120px; }
.form .btn{ width:100%; justify-content:center; }
.form-note{ font-size:13px; color:var(--muted); margin-top:14px; text-align:center; }
.form-status{ margin-top:16px; padding:12px 16px; border-radius:10px; font-size:14px; display:none; }
.form-status.ok{ display:block; background:rgba(40,200,100,.12); border:1px solid rgba(40,200,100,.3); color:#7be6a6; }
.form-status.err{ display:block; background:rgba(255,80,80,.12); border:1px solid rgba(255,80,80,.3); color:#ff9a9a; }

/* ---------- CTA band ---------- */
.cta-band{ position:relative; overflow:hidden; border:1px solid var(--line-2); border-radius:var(--radius-lg);
  background:linear-gradient(120deg, rgba(255,106,19,.16), rgba(255,106,19,.04));
  padding:56px 48px; text-align:center; }
.cta-band .glow--orange{ width:420px; height:420px; top:-220px; left:50%; transform:translateX(-50%); }
.cta-band h2{ font-size:clamp(26px,3.4vw,38px); margin-bottom:14px; position:relative; z-index:2; }
.cta-band p{ color:var(--text-2); max-width:560px; margin:0 auto 30px; position:relative; z-index:2; }
.cta-band .hero-actions{ justify-content:center; position:relative; z-index:2; }

/* ---------- Footer ---------- */
.site-footer{ border-top:1px solid var(--line); background:var(--bg-2); padding:60px 0 30px; margin-top:40px; }
.footer-grid{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1.4fr; gap:40px; margin-bottom:44px; }
.footer-brand .brand{ margin-bottom:16px; }
.footer-brand p{ color:var(--muted); font-size:14px; max-width:320px; }
.footer-col h4{ font-size:14px; color:var(--text); margin-bottom:16px; letter-spacing:.05em; }
.footer-col a, .footer-col p{ display:block; color:var(--muted); font-size:14px; margin-bottom:10px; }
.footer-col a:hover{ color:var(--orange-2); }
.footer-bottom{ border-top:1px solid var(--line); padding-top:24px; display:flex; flex-wrap:wrap;
  justify-content:space-between; gap:12px; color:var(--muted); font-size:13px; }
.footer-bottom a:hover{ color:var(--orange-2); }

/* ---------- Reveal animation ---------- */
.reveal{ opacity:0; transform:translateY(24px); transition:opacity .7s ease, transform .7s ease; }
.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; }
@media (prefers-reduced-motion:reduce){ .reveal{ opacity:1; transform:none; transition:none; } html{ scroll-behavior:auto; } }

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .steps{ grid-template-columns:1fr; }
  .step .line{ display:none; }
  .case-layout{ grid-template-columns:1fr; gap:36px; }
  .side-card{ position:static; }
  .contact-grid{ grid-template-columns:1fr; gap:30px; }
  .footer-grid{ grid-template-columns:1fr 1fr; gap:30px; }
}
@media (max-width:720px){
  .section{ padding:70px 0; }
  .nav-links{ position:fixed; inset:72px 0 auto 0; flex-direction:column; align-items:stretch; gap:4px;
    background:rgba(18,20,25,.98); backdrop-filter:blur(14px); padding:16px 20px 24px;
    border-bottom:1px solid var(--line); transform:translateY(-140%); transition:transform .32s ease; }
  .nav-links.open{ transform:none; }
  .nav-links a{ padding:14px 16px; font-size:16px; }
  .nav-cta{ margin:8px 0 0; }
  .nav-toggle{ display:inline-flex; }
  .grid-2, .grid-3, .grid-4, .modules, .gallery{ grid-template-columns:1fr; }
  .cta-band{ padding:40px 24px; }
  .hero-badges{ gap:20px; }
  .hero-badges .hb b{ font-size:24px; }
}