/* ========================================
   悦荐网络 · v4.0 Obsidian Pulse
   深空 cinematic · 电光青 + 琥珀 · 炫技不廉价
   ======================================== */

:root {
  --void: #040608;
  --bg-deep: #0a0e14;
  --bg: #0f1520;
  --surface: #151c28;
  --surface-raised: #1c2536;
  --surface-light: #f2f4f7;
  --surface-card: #ffffff;

  --accent: #00e5c0;
  --accent-dim: #00b89a;
  --accent-glow: rgba(0, 229, 192, 0.45);
  --accent-soft: rgba(0, 229, 192, 0.12);
  --amber: #ffb020;
  --amber-soft: rgba(255, 176, 32, 0.15);

  --text-bright: #f0f4f8;
  --text-dark: #0f172a;
  --text-muted-dark: #8b95a8;
  --text-muted-light: #64748b;
  --text-secondary-light: #475569;

  --border-dark: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 192, 0.35);
  --border-light: #e2e8f0;

  --font-display: "Space Grotesk", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6.5rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-glow: 0 0 40px rgba(0, 229, 192, 0.12);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.25);
  --shadow-card-light: 0 8px 28px rgba(15, 23, 42, 0.08);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.28s;
  --header-h: 72px;
  --container: 1180px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background: var(--surface-light);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

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

/* ── Skip & focus ── */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-sm);
  z-index: 9999;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: var(--void);
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: var(--space-sm); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.6rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  transition: transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              background var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
  cursor: pointer;
  white-space: nowrap;
}

.btn-sm { padding: 0.5rem 1.1rem; font-size: 0.82rem; }
.btn-full { width: 100%; }

.btn-accent {
  background: var(--accent);
  color: var(--void);
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-accent:hover {
  background: #33ecd0;
  transform: translateY(-2px);
  box-shadow: 0 0 36px var(--accent-glow);
}
.btn-accent:active { transform: scale(0.98); }
.btn-accent:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: transparent;
  color: var(--text-bright);
  border-color: var(--border-dark);
}
.btn-ghost:hover {
  border-color: var(--border-glow);
  background: var(--accent-soft);
}

.btn-outline-light {
  background: transparent;
  color: var(--text-bright);
  border-color: var(--border-dark);
}

/* ── Header ── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), backdrop-filter 0.35s;
}

.header .nav-link { color: var(--text-muted-dark); }
.header .nav-link:hover,
.header .nav-link.active { color: var(--accent); }
.header .nav-toggle span { background: var(--text-bright); }

.header.scrolled {
  background: rgba(10, 14, 20, 0.88);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border-dark);
}

.header.header--light {
  background: rgba(242, 244, 247, 0.92);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border-light);
}
.header.header--light .nav-link { color: var(--text-muted-light); }
.header.header--light .nav-link:hover,
.header.header--light .nav-link.active { color: var(--accent-dim); }
.header.header--light .nav-toggle span { background: var(--text-dark); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-img { height: 36px; width: auto; object-fit: contain; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--duration) var(--ease);
}

.nav-cta-item { margin-left: 0.25rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: none;
  border: none;
  padding: 10px;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  border-radius: 1px;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  background: var(--bg-deep);
  color: var(--text-bright);
  overflow: hidden;
}

.hero-fx {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-mesh {
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(ellipse 55% 45% at 15% 35%, rgba(0, 229, 192, 0.18), transparent 60%),
    radial-gradient(ellipse 45% 40% at 85% 65%, rgba(255, 176, 32, 0.1), transparent 55%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(0, 120, 255, 0.06), transparent 50%);
  animation: mesh-drift 14s ease-in-out infinite alternate;
}

@keyframes mesh-drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(2%, -1.5%) scale(1.04); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 192, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 192, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 45%, black 10%, transparent 75%);
}

.hero-noise {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--space-md);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.text-glow {
  background: linear-gradient(135deg, var(--accent) 0%, #7affec 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted-dark);
  max-width: 440px;
  margin-bottom: var(--space-lg);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* Terminal panel */
.hero-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.terminal {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glow);
  background: rgba(8, 12, 18, 0.85);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.65rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-dark);
}

.terminal-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #ff5f57;
}
.terminal-dot:nth-child(2) { background: #febc2e; }
.terminal-dot:nth-child(3) { background: #28c840; }

.terminal-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted-dark);
}

.terminal-body {
  padding: 1.25rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--accent);
  min-height: 168px;
  white-space: pre-wrap;
  word-break: break-all;
}

.terminal-cursor {
  display: inline-block;
  width: 8px; height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* Hero stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-glow);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-glow);
}

.stat-item {
  padding: 1rem 0.75rem;
  background: rgba(15, 21, 32, 0.9);
  text-align: center;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-bright);
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: 0.68rem;
  color: var(--text-muted-dark);
  margin-top: 0.35rem;
  display: block;
  letter-spacing: 0.04em;
}

/* ── Tech marquee ── */
.tech-marquee {
  position: relative;
  background: var(--void);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  padding: 1rem 0;
  overflow: hidden;
}

.tech-marquee-track {
  display: flex;
  gap: 3rem;
  width: max-content;
  animation: marquee 28s linear infinite;
}

.tech-marquee-track span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted-dark);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.tech-marquee-fade {
  position: absolute;
  top: 0; bottom: 0;
  width: 80px;
  z-index: 1;
  pointer-events: none;
}
.tech-marquee-fade--left {
  left: 0;
  background: linear-gradient(90deg, var(--void), transparent);
}
.tech-marquee-fade--right {
  right: 0;
  background: linear-gradient(270deg, var(--void), transparent);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ── Sections ── */
.section { padding: var(--space-2xl) 0; position: relative; }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 0.65rem;
}

.section-eyebrow--light { color: var(--accent); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.contact .section-title { color: var(--text-bright); }

.section-desc {
  color: var(--text-secondary-light);
  margin-top: var(--space-sm);
  font-size: 0.95rem;
  max-width: 460px;
}

.section-head { margin-bottom: var(--space-xl); }
.section-head--center { text-align: center; }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── About ── */
.about { background: var(--surface-card); }

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-lead {
  font-size: 1rem;
  color: var(--text-secondary-light);
  line-height: 1.8;
  margin: var(--space-md) 0 var(--space-lg);
}

.about-metrics {
  display: flex;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-dark);
}
.metric-label { font-size: 0.8rem; color: var(--text-muted-light); }

.about-features { display: flex; flex-direction: column; gap: var(--space-sm); }

.feature-card {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--surface-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.feature-card:hover {
  border-color: var(--accent-dim);
  box-shadow: var(--shadow-card-light);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-dim);
  flex-shrink: 0;
  padding-top: 0.2rem;
}
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.feature-card p { font-size: 0.875rem; color: var(--text-secondary-light); line-height: 1.65; }

/* ── Services ── */
.services {
  background: var(--surface-light);
  border-top: 1px solid var(--border-light);
}

.bento-services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 14px;
}

.bento-svc {
  background: var(--surface-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
  overflow: hidden;
  position: relative;
}
.bento-svc:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-light);
}

.bento-svc--large {
  grid-row: span 2;
  grid-column: 1;
  padding: 0;
  min-height: 340px;
}

.bento-svc-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.5s var(--ease);
}
.bento-svc--large:hover .bento-svc-bg { transform: scale(1.04); }

.bento-svc-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-md);
  background: linear-gradient(to top, rgba(4, 6, 8, 0.92) 0%, rgba(4, 6, 8, 0.4) 55%, transparent 100%);
  color: var(--text-bright);
}
.bento-svc-content h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.bento-svc-content p { font-size: 0.875rem; color: var(--text-muted-dark); line-height: 1.65; margin-bottom: var(--space-sm); }

.bento-svc-icon {
  width: 42px; height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  color: var(--accent-dim);
  margin-bottom: 0.25rem;
}
.bento-svc-icon svg { width: 22px; height: 22px; }
.bento-svc-content .bento-svc-icon { background: rgba(0, 229, 192, 0.15); color: var(--accent); }

.bento-svc h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
}
.bento-svc p { font-size: 0.85rem; color: var(--text-secondary-light); line-height: 1.65; flex: 1; }

.bento-svc-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  transition: color var(--duration) var(--ease);
}
.bento-svc-link:hover { color: #7affec; }

/* ── Process ── */
.process {
  background: var(--bg);
  color: var(--text-bright);
}

.process .section-eyebrow { color: var(--accent); }
.process .section-title { color: var(--text-bright); }

.process-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  position: relative;
  padding-top: var(--space-md);
}

.process-line {
  position: absolute;
  top: calc(var(--space-md) + 22px);
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--border-dark);
  border-radius: 1px;
  overflow: hidden;
}

.process-line-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  box-shadow: 0 0 12px var(--accent-glow);
  transition: width 0.1s linear;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-dark);
  transition: border-color var(--duration) var(--ease);
}
.process-step:hover { border-color: var(--border-glow); }

.process-dot {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-raised);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  position: relative;
  z-index: 1;
  box-shadow: 0 0 16px rgba(0, 229, 192, 0.15);
}

.process-step h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
}
.process-step p {
  font-size: 0.85rem;
  color: var(--text-muted-dark);
  line-height: 1.65;
}

/* ── Cases ── */
.cases { background: var(--surface-card); }

.cases-bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 14px;
}

.case-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
  background: var(--surface-card);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-light);
}

.case-card--featured {
  grid-row: span 2;
  border-color: transparent;
  background: linear-gradient(var(--surface-card), var(--surface-card)) padding-box,
              linear-gradient(135deg, var(--accent), var(--amber)) border-box;
  border: 1px solid transparent;
}

.case-visual {
  height: 170px;
  background-size: cover;
  background-position: center;
}
.case-card--featured .case-visual { height: 260px; }

.case-visual--1 { background-image: url('../static/qiyeguanlixit.jpg'); }
.case-visual--2 { background-image: url('../static/app.jpg'); }
.case-visual--3 { background-image: url('../static/xiaochengxu.jpg'); }

.case-content { padding: var(--space-md); }

.case-tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  background: var(--accent-soft);
  color: var(--accent-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}

.case-content h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.case-card--featured .case-content h3 { font-size: 1.15rem; }

.case-content p {
  font-size: 0.875rem;
  color: var(--text-secondary-light);
  line-height: 1.7;
}

/* ── Contact ── */
.contact {
  background: var(--bg-deep);
  color: var(--text-bright);
  border-top: 1px solid var(--border-dark);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact-desc {
  color: var(--text-muted-dark);
  margin: var(--space-md) 0 var(--space-lg);
  line-height: 1.8;
}

.contact-list { display: flex; flex-direction: column; gap: var(--space-md); }
.contact-list li { display: flex; align-items: flex-start; gap: var(--space-sm); }

.contact-icon {
  width: 38px; height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-sm);
  color: var(--accent);
  flex-shrink: 0;
}
.contact-icon svg { width: 16px; height: 16px; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted-dark);
}
.contact-list span,
.contact-list a { color: var(--text-bright); font-size: 0.95rem; }
.contact-list a { color: var(--accent); transition: color var(--duration) var(--ease); }
.contact-list a:hover { color: #7affec; }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.contact-form:focus-within {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-group { margin-bottom: var(--space-md); }
.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted-dark);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 0.9rem;
  font-family: inherit;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  background: var(--bg-deep);
  color: var(--text-bright);
  transition: border-color var(--duration) var(--ease);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted-dark); }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-glow);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.form-note {
  margin-top: var(--space-sm);
  font-size: 0.85rem;
  text-align: center;
  min-height: 1.2em;
  color: var(--text-muted-dark);
}
.form-note.success { color: var(--accent); }

/* ── Footer ── */
.footer {
  background: var(--void);
  border-top: 1px solid var(--border-dark);
  padding: var(--space-md) 0;
  color: var(--text-muted-dark);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer-logo img { height: 26px; opacity: 0.85; }
.footer-inner p,
.footer-beian { font-size: 0.78rem; color: var(--text-muted-dark); }
.footer-beian:hover { color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-layout { grid-template-columns: 1fr; gap: var(--space-lg); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .about-layout { grid-template-columns: 1fr; }
  .bento-services { grid-template-columns: 1fr 1fr; }
  .bento-svc--large { grid-row: span 1; grid-column: span 2; min-height: 260px; }
  .process-track { grid-template-columns: repeat(2, 1fr); }
  .process-line { display: none; }
  .cases-bento { grid-template-columns: 1fr; }
  .case-card--featured { grid-row: span 1; }
  .contact-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --space-2xl: 4.5rem; --header-h: 64px; }
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--bg-deep);
    flex-direction: column;
    padding: var(--space-md);
    gap: 0;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
    border-bottom: 1px solid var(--border-dark);
  }
  .header.header--light .nav-links { background: var(--surface-card); }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links li { width: 100%; }
  .nav-link { display: block; padding: var(--space-sm) 0; border-bottom: 1px solid var(--border-dark); }
  .header.header--light .nav-link { border-bottom-color: var(--border-light); }
  .nav-cta-item { margin: var(--space-sm) 0 0; }
  .nav-cta-item .btn { width: 100%; }

  .about-metrics { gap: var(--space-md); }
  .bento-services { grid-template-columns: 1fr; }
  .bento-svc--large { grid-column: span 1; }
  .process-track { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .about-metrics { flex-direction: column; gap: var(--space-sm); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .tech-marquee-track { animation: none; }
  .hero-mesh { animation: none; }
  .terminal-cursor { animation: none; opacity: 1; }
  html { scroll-behavior: auto; }
}