/* ============================================================
   网迪科技 — Engineering Blueprint Theme
   深空蓝图：深色科技底 + 电光青高亮 + 工程网格质感
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400..800&family=JetBrains+Mono:wght@400;500;700&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  --bg:            #070b12;
  --bg-soft:       #0b1220;
  --surface:       #0f1826;
  --surface-2:     #14202f;
  --line:          rgba(120, 200, 220, 0.10);
  --line-strong:   rgba(120, 200, 220, 0.22);

  --ink:           #e8f0f5;
  --ink-soft:      #aebccb;
  --ink-mute:      #6c7d90;

  --cyan:          #1ee3cf;
  --cyan-deep:     #0bb6a6;
  --blue:          #4d8dff;
  --amber:         #ffb347;
  --grad:          linear-gradient(120deg, var(--cyan), var(--blue));

  --glow-cyan:     0 0 0 1px rgba(30,227,207,.30), 0 12px 40px -12px rgba(30,227,207,.45);
  --shadow-card:   0 24px 60px -28px rgba(0,0,0,.85);

  --font-display:  'Bricolage Grotesque', 'Noto Sans SC', sans-serif;
  --font-body:     'Noto Sans SC', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  --maxw:          1180px;
  --radius:        16px;
  --ease:          cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-weight: 400;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ---------- Blueprint background ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 600px at 78% -8%, rgba(77,141,255,.16), transparent 60%),
    radial-gradient(900px 500px at 8% 4%, rgba(30,227,207,.12), transparent 55%),
    var(--bg);
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 110% at 50% 0%, #000 35%, transparent 78%);
          mask-image: radial-gradient(120% 110% at 50% 0%, #000 35%, transparent 78%);
  opacity: .7;
}

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
section { position: relative; }
.section-pad { padding-block: clamp(64px, 9vw, 130px); }

/* ---------- Typographic helpers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 26px; height: 1px;
  background: var(--cyan);
  opacity: .8;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -.01em; }
.h-sec { font-size: clamp(1.9rem, 4vw, 3rem); margin-block: 18px 16px; }
.lead { color: var(--ink-soft); font-size: clamp(1rem, 1.4vw, 1.12rem); max-width: 56ch; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 500;
  font-size: .96rem;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: var(--grad);
  color: #04141a;
  font-weight: 700;
  box-shadow: 0 10px 30px -10px rgba(30,227,207,.55);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -12px rgba(30,227,207,.7); }
.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: rgba(255,255,255,.02);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-3px); }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(7,11,18,.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--font-display); font-weight: 700; font-size: 1.18rem; letter-spacing: -.01em; }
.brand .mark {
  width: 34px; height: 34px; flex: none;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--grad);
  color: #04141a;
  font-weight: 800;
  box-shadow: var(--glow-cyan);
}
.brand small { display:block; font-family: var(--font-mono); font-size:.6rem; letter-spacing:.18em; color: var(--ink-mute); font-weight:400; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 9px 15px;
  font-size: .94rem;
  color: var(--ink-soft);
  border-radius: 8px;
  transition: color .2s, background .2s;
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content:''; position:absolute; left:15px; right:15px; bottom:2px; height:2px;
  background: var(--grad); border-radius: 2px;
}
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-toggle { display: none; width: 42px; height: 42px; border-radius: 10px; border: 1px solid var(--line-strong); }
.nav-toggle span { display:block; width:18px; height:2px; background: var(--ink); margin: 3px auto; transition: .3s; }

/* ============================================================
   Hero
   ============================================================ */
.hero { padding-block: clamp(60px, 9vw, 120px) clamp(50px, 7vw, 90px); }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 5.6vw, 4.3rem);
  margin-block: 22px 22px;
}
.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .line > span { display: inline-block; }
.hero .lead { font-size: clamp(1.02rem, 1.5vw, 1.18rem); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero-stats {
  display: flex; gap: 38px; margin-top: 46px;
  padding-top: 30px; border-top: 1px solid var(--line);
}
.hero-stats .num { font-family: var(--font-display); font-size: 2rem; font-weight: 700; color: var(--ink); line-height: 1; }
.hero-stats .num span { color: var(--cyan); }
.hero-stats .lbl { font-size: .82rem; color: var(--ink-mute); margin-top: 6px; }

/* Terminal card */
.code-card {
  background: linear-gradient(180deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
}
.code-card::after {
  content:''; position:absolute; inset:0; border-radius:18px; pointer-events:none;
  background: linear-gradient(120deg, rgba(30,227,207,.10), transparent 40%);
}
.code-top { display:flex; align-items:center; gap:8px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.code-top i { width: 11px; height: 11px; border-radius: 50%; display:block; }
.code-top i:nth-child(1){ background:#ff5f57; } .code-top i:nth-child(2){ background:#febc2e; } .code-top i:nth-child(3){ background:#28c840; }
.code-top span { margin-left: 10px; font-family: var(--font-mono); font-size: .76rem; color: var(--ink-mute); }
.code-body { padding: 22px 22px 26px; font-family: var(--font-mono); font-size: .84rem; line-height: 1.85; }
.code-body .ln { color: var(--ink-mute); }
.code-body .k { color: var(--blue); } .code-body .s { color: var(--cyan); } .code-body .c { color: var(--ink-mute); font-style: italic; }
.code-body .typed::after { content:'▋'; color: var(--cyan); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ============================================================
   Marquee / trust bar
   ============================================================ */
.trust { border-block: 1px solid var(--line); padding-block: 22px; overflow: hidden; }
.trust .wrap { display:flex; align-items:center; gap: 18px; }
.trust .lbl { font-family: var(--font-mono); font-size:.72rem; letter-spacing:.2em; color: var(--ink-mute); white-space:nowrap; text-transform:uppercase; }
.trust .tags { display:flex; flex-wrap:wrap; gap:10px; }
.trust .tags span {
  font-family: var(--font-mono); font-size:.82rem; color: var(--ink-soft);
  padding: 5px 13px; border:1px solid var(--line); border-radius:999px;
}

/* ============================================================
   Section header
   ============================================================ */
.sec-head { max-width: 720px; margin-bottom: 52px; }
.sec-head.center { margin-inline: auto; text-align: center; }
.sec-head.center .lead { margin-inline: auto; }

/* ============================================================
   Cards grid (services / features)
   ============================================================ */
.grid { display: grid; gap: 20px; }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  position: relative;
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.card::before {
  content:''; position:absolute; left:0; top:0; height:100%; width:3px;
  background: var(--grad); transform: scaleY(0); transform-origin: top; transition: transform .35s var(--ease);
}
.card:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: var(--shadow-card); }
.card:hover::before { transform: scaleY(1); }
.card .ico {
  width: 50px; height: 50px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(30,227,207,.08); border: 1px solid var(--line-strong); color: var(--cyan);
  margin-bottom: 18px;
}
.card .ico svg { width: 24px; height: 24px; }
.card h3 { font-size: 1.22rem; margin-bottom: 10px; }
.card p { color: var(--ink-soft); font-size: .95rem; }
.card .meta { margin-top: 16px; display:flex; flex-wrap:wrap; gap:8px; }
.card .meta b { font-family: var(--font-mono); font-weight:500; font-size:.74rem; color: var(--ink-mute); padding:3px 9px; border:1px solid var(--line); border-radius:6px; }
.card .idx { position:absolute; top:22px; right:24px; font-family: var(--font-mono); font-size:.8rem; color: var(--ink-mute); }

/* ============================================================
   Process steps
   ============================================================ */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; position: relative; }
.steps::before { content:''; position:absolute; top:25px; left:6%; right:6%; height:1px; background: var(--line-strong); }
.step { text-align:center; position:relative; }
.step .dot {
  width: 52px; height: 52px; border-radius: 50%; margin: 0 auto 16px;
  display:grid; place-items:center; font-family: var(--font-mono); font-weight:700;
  background: var(--surface); border: 1px solid var(--line-strong); color: var(--cyan);
  position: relative; z-index: 1; transition: .3s;
}
.step:hover .dot { background: var(--grad); color:#04141a; box-shadow: var(--glow-cyan); }
.step h4 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 6px; }
.step p { font-size: .85rem; color: var(--ink-mute); }

/* ============================================================
   Why-us split
   ============================================================ */
.split { display:grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items:center; }
.feat-list { display:grid; gap: 14px; }
.feat {
  display:flex; gap:16px; padding: 20px 22px;
  background: var(--surface); border:1px solid var(--line); border-radius: 14px;
  transition: border-color .3s, transform .3s;
}
.feat:hover { border-color: var(--line-strong); transform: translateX(4px); }
.feat .n { font-family: var(--font-mono); color: var(--cyan); font-size: .9rem; flex:none; padding-top: 2px; }
.feat h4 { font-family: var(--font-display); font-size: 1.1rem; margin-bottom: 4px; }
.feat p { font-size: .9rem; color: var(--ink-soft); }

/* ============================================================
   Stat band
   ============================================================ */
.band {
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  background:
    radial-gradient(700px 300px at 80% 0%, rgba(77,141,255,.16), transparent 60%),
    linear-gradient(180deg, var(--surface), var(--bg-soft));
  padding: clamp(40px, 6vw, 70px);
  text-align: center;
  position: relative; overflow: hidden;
}
.band h2 { font-size: clamp(1.8rem, 3.6vw, 2.7rem); margin-bottom: 14px; }
.band .lead { margin-inline: auto; margin-bottom: 30px; }
.band-cta { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { border-top: 1px solid var(--line); padding-block: 60px 30px; margin-top: 20px; }
.foot-grid { display:grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 36px; }
.foot-grid h5 { font-family: var(--font-mono); font-size:.74rem; letter-spacing:.18em; text-transform:uppercase; color: var(--ink-mute); margin-bottom: 18px; }
.foot-grid a, .foot-grid li { color: var(--ink-soft); font-size:.92rem; padding-block: 5px; transition: color .2s; }
.foot-grid a:hover { color: var(--cyan); }
.foot-about p { color: var(--ink-soft); font-size: .92rem; margin: 14px 0; max-width: 32ch; }
.foot-contact li { display:flex; gap:10px; align-items:flex-start; }
.foot-contact svg { width:16px; height:16px; color: var(--cyan); flex:none; margin-top: 6px; }
.foot-bottom {
  margin-top: 46px; padding-top: 24px; border-top: 1px solid var(--line);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;
  font-size:.82rem; color: var(--ink-mute);
}
.foot-bottom a { color: var(--ink-mute); }
.foot-bottom a:hover { color: var(--cyan); }

/* ============================================================
   Page hero (inner pages)
   ============================================================ */
.page-hero { padding-block: clamp(56px, 7vw, 90px) clamp(30px, 4vw, 50px); }
.page-hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); margin-block: 16px 18px; }
.crumb { font-family: var(--font-mono); font-size:.78rem; color: var(--ink-mute); }
.crumb a:hover { color: var(--cyan); }

/* ============================================================
   Case cards
   ============================================================ */
.case {
  background: var(--surface); border:1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.case:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: var(--shadow-card); }
.case .thumb {
  aspect-ratio: 16/10; position: relative; overflow:hidden;
  background: linear-gradient(135deg, var(--surface-2), var(--bg-soft));
  display:grid; place-items:center;
}
.case .thumb::before {
  content:''; position:absolute; inset:0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 26px 26px; opacity:.6;
}
.case .thumb .glyph { font-family: var(--font-display); font-weight:700; font-size: 2.6rem; background: var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; position:relative; }
.case .body { padding: 24px 26px 28px; }
.case .tag { font-family: var(--font-mono); font-size:.72rem; color: var(--cyan); letter-spacing:.12em; }
.case h3 { font-size: 1.25rem; margin: 8px 0 8px; }
.case p { color: var(--ink-soft); font-size:.92rem; }
.case .stack { margin-top: 16px; display:flex; flex-wrap:wrap; gap:7px; }
.case .stack b { font-family: var(--font-mono); font-weight:500; font-size:.72rem; color: var(--ink-mute); padding:3px 9px; border:1px solid var(--line); border-radius:6px; }

/* ============================================================
   About
   ============================================================ */
.about-grid { display:grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: start; }
.about-grid p { color: var(--ink-soft); margin-bottom: 16px; }
.profile-card {
  background: var(--surface); border:1px solid var(--line-strong); border-radius: 18px;
  padding: 30px; box-shadow: var(--shadow-card);
}
.profile-card .row { display:flex; justify-content:space-between; padding: 13px 0; border-bottom: 1px solid var(--line); font-size:.92rem; }
.profile-card .row:last-child { border-bottom: none; }
.profile-card .row span { color: var(--ink-mute); }
.profile-card .row b { font-weight: 500; font-family: var(--font-mono); }
.values { display:grid; grid-template-columns: repeat(2,1fr); gap: 16px; margin-top: 12px; }

/* ============================================================
   Contact
   ============================================================ */
.contact-grid { display:grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-cards { display:grid; gap: 16px; }
.cc {
  display:flex; gap: 18px; align-items:center;
  background: var(--surface); border:1px solid var(--line); border-radius: 14px; padding: 20px 22px;
  transition: border-color .3s, transform .3s;
}
.cc:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.cc .ico { width:48px; height:48px; border-radius:12px; flex:none; display:grid; place-items:center; background: rgba(30,227,207,.08); border:1px solid var(--line-strong); color: var(--cyan); }
.cc .ico svg { width:22px; height:22px; }
.cc .lbl { font-size:.78rem; color: var(--ink-mute); font-family: var(--font-mono); letter-spacing:.08em; }
.cc .val { font-size: 1.05rem; font-weight: 500; }
.qr-box { text-align:center; padding: 26px; background: var(--surface); border:1px solid var(--line); border-radius:14px; }
.qr-box .ph {
  width: 170px; height: 170px; margin: 0 auto 14px; border-radius: 12px;
  display:grid; place-items:center; text-align:center;
  background: var(--surface-2); border: 1px dashed var(--line-strong); color: var(--ink-mute);
  font-family: var(--font-mono); font-size:.74rem; padding: 16px;
}
.qr-box p { font-size:.86rem; color: var(--ink-soft); }

/* Form */
.form { background: var(--surface); border:1px solid var(--line-strong); border-radius: 18px; padding: 32px; box-shadow: var(--shadow-card); }
.form h3 { font-size: 1.4rem; margin-bottom: 6px; }
.form > p { color: var(--ink-soft); font-size:.92rem; margin-bottom: 22px; }
.field { margin-bottom: 16px; }
.field label { display:block; font-size:.82rem; color: var(--ink-soft); margin-bottom: 7px; font-family: var(--font-mono); letter-spacing:.04em; }
.field label .req { color: var(--amber); }
.field input, .field textarea, .field select {
  width: 100%; padding: 13px 15px; border-radius: 10px;
  background: var(--bg-soft); border: 1px solid var(--line-strong); color: var(--ink);
  font-family: var(--font-body); font-size: .95rem; transition: border-color .25s, box-shadow .25s;
}
.field input::placeholder, .field textarea::placeholder { color: var(--ink-mute); }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(30,227,207,.14);
}
.field textarea { resize: vertical; min-height: 110px; }
.field-row { display:grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form .btn-primary { width: 100%; justify-content: center; margin-top: 6px; }
.form-note { font-size:.8rem; color: var(--ink-mute); margin-top: 14px; text-align:center; }
.form-ok, .form-err { display:none; padding: 14px 16px; border-radius:10px; font-size:.9rem; margin-bottom: 18px; }
.form-ok { background: rgba(30,227,207,.1); border:1px solid var(--cyan); color: var(--cyan); }
.form-err { background: rgba(255,120,120,.1); border:1px solid #ff8585; color: #ff9d9d; }
.form-ok.show, .form-err.show { display:block; }
#submit-btn[disabled] { opacity:.6; cursor: progress; }

/* ============================================================
   FAQ
   ============================================================ */
.faq { max-width: 820px; margin-inline:auto; }
.faq details {
  border: 1px solid var(--line); border-radius: 12px; padding: 6px 22px; margin-bottom: 12px;
  background: var(--surface); transition: border-color .3s;
}
.faq details[open] { border-color: var(--line-strong); }
.faq summary { cursor: pointer; list-style:none; padding: 16px 0; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; display:flex; justify-content:space-between; align-items:center; gap: 16px; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:'+'; font-family: var(--font-mono); color: var(--cyan); font-size: 1.4rem; transition: transform .3s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 0 18px; color: var(--ink-soft); font-size:.94rem; }

/* ============================================================
   Scroll reveal
   ============================================================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
.reveal[data-d="4"] { transition-delay: .32s; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
  .hero-grid, .split, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2,1fr); gap: 28px 14px; }
  .steps::before { display:none; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .code-card { order: -1; }
}
@media (max-width: 680px) {
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; left: 16px; right: 16px; top: 78px;
    background: var(--surface); border:1px solid var(--line-strong); border-radius: 14px;
    padding: 12px; box-shadow: var(--shadow-card);
  }
  .nav-links.open a { padding: 13px 16px; }
  .cols-3, .cols-4, .cols-2, .values, .field-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 22px; flex-wrap: wrap; }
  .foot-grid { grid-template-columns: 1fr; }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}