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

:root {
  --bg: #080810;
  --surface: #0d0d1a;
  --surface2: #111120;
  --accent: #e8c97a;
  --accent-dim: rgba(232, 201, 122, 0.12);
  --accent-glow: rgba(232, 201, 122, 0.35);
  --text: #f0ede6;
  --text-dim: rgba(240, 237, 230, 0.42);
  --text-muted: rgba(240, 237, 230, 0.2);
  --border: rgba(232, 201, 122, 0.15);
  --line: rgba(240, 237, 230, 0.07);
  --red: #e85a4f;
}

html { scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: var(--accent) var(--surface); scroll-padding-top: 100px; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 2px; }
::selection { background: var(--accent); color: var(--bg); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
  overflow-x: hidden;
}

/* ─── Noise ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' 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='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
}

/* ══════════════════════════════════════
   NAVIGATION
══════════════════════════════════════ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  background: rgba(8, 8, 16, 0.82);
  border-bottom: 1px solid var(--line);
  transition: all 0.4s;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.nav-logo-text {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--text);
  font-weight: 700;
  line-height: 1.2;
}

.nav-logo-sub {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.2em;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.3s;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s;
}

.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

.nav-links a.active { color: var(--accent); }
.nav-links a.active::after { width: 100%; }

/* ─── Hamburger ─── */
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 101;
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--accent);
  transition: all 0.3s;
}
.nav-burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-burger.active span:nth-child(2) { opacity: 0; }
.nav-burger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.nav-contact {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--bg);
  background: var(--accent);
  padding: 0.45rem 1.25rem;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.3s;
}

.nav-contact:hover {
  background: var(--text);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 3rem 5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 20%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 20%, transparent 100%);
}

.hero-circle {
  position: absolute;
  right: -8%;
  top: 50%;
  transform: translateY(-50%);
  width: min(55vw, 780px);
  height: min(55vw, 780px);
  border-radius: 50%;
  border: 1px solid var(--border);
  opacity: 0;
  animation: circleReveal 2s ease-out 0.4s forwards;
}

.hero-circle::before {
  content: '';
  position: absolute;
  inset: 60px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.hero-circle::after {
  content: '';
  position: absolute;
  inset: 120px;
  border-radius: 50%;
  border: 1px dashed var(--border);
  animation: slowRotate 50s linear infinite;
}

@keyframes slowRotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes circleReveal { from { opacity: 0; transform: translateY(-50%) scale(0.8); } to { opacity: 1; transform: translateY(-50%) scale(1); } }

.hero-line-v {
  position: absolute;
  left: 3rem;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--accent) 30%, var(--accent) 70%, transparent);
  opacity: 0.25;
}

.hero-orb {
  position: absolute;
  right: 18%;
  top: 50%;
  transform: translateY(-50%);
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(232,201,122,0.22) 0%, rgba(232,201,122,0.06) 40%, transparent 70%);
  filter: blur(2px);
  animation: orbPulse 4s ease-in-out infinite;
}

.hero-diagram {
  position: absolute;
  right: 5%;
  top: 25%;
  transform: translateY(-50%);
  width: min(42vw, 520px);
  z-index: 1;
  opacity: 0;
  animation: fadeUp 1.2s ease-out 0.9s forwards;
}

@keyframes orbPulse {
  0%, 100% { transform: translateY(-50%) scale(1); opacity: 0.8; }
  50% { transform: translateY(-50%) scale(1.06); opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 920px;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.2s forwards;
}

.hero-eyebrow-line {
  width: 36px;
  height: 1px;
  background: var(--accent);
}

.hero-eyebrow-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
}

.hero-title-en {
  font-family: 'Space Mono', monospace;
  font-size: clamp(3.5rem, 9vw, 8.5rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 0.92;
  color: var(--text);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.4s forwards;
}

.hero-title-cn {
  font-weight: 300;
  font-size: clamp(0.95rem, 2vw, 1.5rem);
  letter-spacing: 0.45em;
  color: var(--text-dim);
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.6s forwards;
}

.hero-divider {
  width: 50px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.7s forwards;
}

.hero-tagline {
  font-size: clamp(1.3rem, 2.8vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.8s forwards;
}

.hero-slogan {
  font-size: clamp(0.82rem, 1.3vw, 0.95rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  line-height: 2;
  max-width: 500px;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 1s forwards;
}

.hero-cta-group {
  display: flex;
  gap: 1.25rem;
  margin-top: 3rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 1.2s forwards;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.85rem 2rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s;
}

.btn-primary:hover::before { transform: translateX(100%); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.85rem 2rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  transition: all 0.3s;
}

.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.btn-arrow { transition: transform 0.3s; }
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  right: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 1.6s forwards;
}

.hero-scroll-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
  writing-mode: vertical-rl;
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse { 0%,100% { opacity: 0.3; } 50% { opacity: 1; } }

/* ══════════════════════════════════════
   SHARED SECTION STYLES
══════════════════════════════════════ */
.section {
  padding: 7rem 3rem;
  position: relative;
}

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 3rem;
  right: 3rem;
  height: 1px;
  background: var(--line);
}

.section-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.7s;
}

.section-label.visible { opacity: 1; transform: translateY(0); }

.section-label-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.section-label-line {
  width: 40px;
  height: 1px;
  background: var(--accent);
}

.section-label-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--text-dim);
  text-transform: uppercase;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUpCenter {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ══════════════════════════════════════
   PHILOSOPHY
══════════════════════════════════════ */
.philosophy {
  padding: 7rem 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.philosophy::before { display: none; }

.philosophy-left {
  opacity: 0;
  transform: translateX(-36px);
  transition: all 0.8s;
}

.philosophy-left.visible { opacity: 1; transform: translateX(0); }

.philosophy-quote {
  font-size: clamp(1.7rem, 3vw, 2.8rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
  margin-bottom: 2.5rem;
}

.philosophy-quote em {
  color: var(--accent);
  font-style: normal;
}

.philosophy-right {
  opacity: 0;
  transform: translateX(36px);
  transition: all 0.8s 0.15s;
}

.philosophy-right.visible { opacity: 1; transform: translateX(0); }

.philosophy-body {
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 2.1;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.philosophy-highlight {
  display: inline-block;
  border-left: 2px solid var(--accent);
  padding-left: 1.25rem;
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.9;
}

/* ══════════════════════════════════════
   TRIPLE ARCHITECTURE
══════════════════════════════════════ */
.architecture {
  padding: 7rem 3rem;
  position: relative;
}

.arch-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: end;
  margin-bottom: 4.5rem;
}

.arch-title {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.arch-title span { color: var(--accent); }

.arch-desc {
  font-size: 0.83rem;
  font-weight: 300;
  line-height: 2;
  color: var(--text-dim);
}

.arch-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
}

.arch-card {
  background: var(--bg);
  padding: 3rem 2.5rem;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s;
}

.arch-card.visible { opacity: 1; transform: translateY(0); }

.arch-card-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.arch-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}

.arch-keywords {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.arch-kw {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.83rem;
  font-weight: 300;
  color: var(--text-dim);
}

.arch-kw-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.arch-card-icon {
  position: absolute;
  right: 2rem;
  bottom: 2.5rem;
  opacity: 0.08;
  transition: opacity 0.4s;
}

.arch-card:hover .arch-card-icon { opacity: 0.2; }

.arch-diagram {
  margin-top: 1.5rem;
  opacity: 0.45;
  transition: opacity 0.4s;
}

.arch-card:hover .arch-diagram { opacity: 0.85; }

.arch-diagram-svg {
  width: 100px;
  height: 100px;
  display: block;
  margin-left: -4px;
}

/* ══════════════════════════════════════
   METHODS
══════════════════════════════════════ */
.methods { padding: 7rem 3rem; }

.methods-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: end;
  margin-bottom: 4rem;
}

.methods-title {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.methods-desc {
  font-size: 0.83rem;
  font-weight: 300;
  line-height: 2;
  color: var(--text-dim);
}

.method-stages {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  background: var(--border);
  position: relative;
}

.method-stages::before {
  content: '';
  position: absolute;
  top: 56px;
  left: calc(10% + 8px);
  right: calc(10% + 8px);
  height: 1px;
  background: linear-gradient(to right, var(--accent), var(--border), var(--accent));
  z-index: 0;
}

.method-stage {
  background: var(--bg);
  padding: 2.5rem 1.75rem;
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.55s;
}

.method-stage.visible { opacity: 1; transform: translateY(0); }

.method-stage::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.method-stage-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.method-stage-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.method-stage-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 1.25rem;
  font-weight: 300;
}

.method-stage-items {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.method-item {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.6;
  padding-left: 0.75rem;
  border-left: 1px solid var(--text-muted);
}

/* ══════════════════════════════════════
   WORKFLOW FLOW
══════════════════════════════════════ */
.workflow-flow {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 1rem;
  margin-bottom: 4rem;
}

.workflow-step {
  flex: 1;
  min-width: 140px;
  text-align: center;
  padding: 1.5rem 1rem;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.55s;
}

.workflow-step.visible { opacity: 1; transform: translateY(0); }

.workflow-step::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 10px solid var(--accent);
  opacity: 0.4;
}

.workflow-step:last-child::after { display: none; }

.workflow-step-num {
  font-family: 'Space Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-muted);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.workflow-step-title {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.workflow-step-desc {
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ══════════════════════════════════════
   CASES
══════════════════════════════════════ */
.cases { padding: 7rem 3rem; }

.cases-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: end;
  margin-bottom: 4rem;
}

.cases-title {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.cases-title span { color: var(--accent); }

.cases-desc {
  font-size: 0.83rem;
  font-weight: 300;
  line-height: 2;
  color: var(--text-dim);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
}

.case-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3 / 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s;
}

.case-card.visible { opacity: 1; transform: translateY(0); }

.case-card-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-size: cover;
  background-position: center;
  transition: transform 0.6s;
}

.case-card:hover .case-card-bg { transform: scale(1.03); }

.case-card[data-case="shucaiyi"] .case-card-bg { background-image: url('../case_images/shucaiyi.png'); }
.case-card[data-case="shuicao"] .case-card-bg { background-image: url('../case_images/shuicaodalaochuan.png'); }
.case-card[data-case="chuifengji"] .case-card-bg { background-image: url('../case_images/lishichuifengji.png'); }
.case-card[data-case="shuinuan"] .case-card-bg { background-image: url('../case_images/shuinuantan.png'); }
.case-card[data-case="huace"] .case-card-bg { background-image: url('../case_images/huace.png'); }
.case-card[data-case="wenhuaqiang"] .case-card-bg { background-image: url('../case_images/wenhuaqiang.png'); }

.case-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom,
    rgba(8,8,16,0.1) 0%,
    rgba(8,8,16,0.55) 50%,
    rgba(8,8,16,0.88) 100%);
  z-index: 2;
  transition: opacity 0.4s;
}

.case-card-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image:
    linear-gradient(var(--accent) 1px, transparent 1px),
    linear-gradient(90deg, var(--accent) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 0;
  transition: opacity 0.4s;
}

.case-card:hover .case-card-pattern { opacity: 0.1; }

.case-card:hover .case-card-overlay {
  background: linear-gradient(to bottom,
    rgba(8,8,16,0.2) 0%,
    rgba(8,8,16,0.65) 50%,
    rgba(8,8,16,0.95) 100%);
}

.case-card-content {
  position: relative;
  z-index: 3;
  padding: 2.5rem;
}

.case-card-tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.case-card-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  transition: color 0.3s;
}

.case-card:hover .case-card-title { color: var(--accent); }

.case-card-sub {
  font-size: 0.83rem;
  font-weight: 300;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.case-card-line {
  width: 0;
  height: 2px;
  background: var(--accent);
  margin-top: 1.25rem;
  transition: width 0.4s;
}

.case-card:hover .case-card-line { width: 60px; }

.case-card.wide {
  grid-column: span 2;
  aspect-ratio: 2 / 1;
}

/* ══════════════════════════════════════
   BRANDS
══════════════════════════════════════ */
.brands { padding: 6rem 3rem; }

.brands-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: end;
  margin-bottom: 3rem;
}

.brands-title {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
}

.brands-title span { color: var(--accent); }

.brands-desc {
  font-size: 0.78rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--text-dim);
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.brand-item {
  background: #ffffff;
  padding: 3rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.55s;
  min-height: 120px;
}

.brand-item.visible { opacity: 1; transform: translateY(0); }

.brand-item:hover { background: var(--accent-dim); }

.brand-item img {
  width: auto;
  height: 44px;
  max-width: 100%;
  object-fit: contain;
  transition: opacity 0.35s;
}

.brand-item:nth-child(3) img { height: 32px; }
.brand-item:nth-child(4) img { height: 56px; }

.brand-item-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-align: center;
  transition: color 0.3s;
}

.brand-item:hover .brand-item-text { color: var(--accent); }

/* ══════════════════════════════════════
   CONTACT / CTA
══════════════════════════════════════ */
.cta-section {
  padding: 7rem 3rem;
  text-align: center;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 3rem;
  right: 3rem;
  height: 1px;
  background: var(--line);
}

.cta-orb {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232,201,122,0.12) 0%, transparent 70%);
  margin: 0 auto 3rem;
  animation: orbPulse 4s ease-in-out infinite;
}

.cta-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.cta-title span { color: var(--accent); }

.cta-body {
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 2;
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 2.5rem;
}

/* ══════════════════════════════════════
   FOOTER
══════════════════════════════════════ */
footer {
  padding: 4rem 3rem 2rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.footer-brand {
  font-family: 'Space Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.footer-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.2em;
}

.footer-info {
  text-align: right;
  font-family: 'Space Mono', monospace;
  font-size: 0.68rem;
  color: var(--text-dim);
  line-height: 2;
  letter-spacing: 0.1em;
}

.footer-copy {
  padding: 1.5rem 3rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  border-top: 1px solid var(--line);
}

/* ══════════════════════════════════════
   CONTACT MODAL
══════════════════════════════════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 16, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.modal-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 3rem 3.5rem;
  min-width: 380px;
  position: relative;
  box-shadow: 0 0 60px rgba(232, 201, 122, 0.08), 0 24px 60px rgba(0,0,0,0.6);
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s ease;
}
.modal-overlay.active .modal-box {
  transform: translateY(0) scale(1);
}
.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1.2rem;
  line-height: 1;
  padding: 0.25rem;
  transition: color 0.2s;
}
.modal-close:hover { color: var(--accent); }
.modal-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.modal-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.modal-sub {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  font-weight: 300;
}
.modal-phone {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.modal-phone-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent);
}
.modal-phone-num {
  font-family: 'Space Mono', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.modal-phone-label {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
}
.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.modal-qrcode {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1.25rem 1.5rem;
  margin-top: 0.25rem;
}
.modal-qrcode-img {
  width: 100px;
  height: 100px;
  border-radius: 4px;
  border: 2px solid var(--border);
  flex-shrink: 0;
  background: #fff;
}
.modal-qrcode-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.modal-qrcode-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.05em;
}
.modal-qrcode-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.modal-btn-call {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  border-radius: 2px;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.modal-btn-call:hover {
  background: #f0d080;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.modal-btn-copy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem;
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.2s;
  font-family: inherit;
}
.modal-btn-copy:hover { color: var(--text); border-color: var(--text-dim); }
.modal-btn-copy.copied { color: var(--accent); border-color: var(--accent); }
.modal-note {
  text-align: center;
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* ══════════════════════════════════════
   ARTICLE LIST PAGE
══════════════════════════════════════ */
.articles-page {
  padding: 8rem 3rem 5rem;
  max-width: 960px;
  margin: 0 auto;
  min-height: 60vh;
}

.articles-page-header {
  margin-bottom: 4rem;
}

.articles-page-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.articles-page-eyebrow-line {
  width: 36px;
  height: 1px;
  background: var(--accent);
}

.articles-page-eyebrow-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
}

.articles-page-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.articles-page-title span { color: var(--accent); }

.articles-page-desc {
  font-size: 0.88rem;
  color: var(--text-dim);
  font-weight: 300;
  line-height: 2;
  max-width: 560px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
  margin-bottom: 4rem;
}

.article-card {
  background: var(--surface);
  padding: 2.5rem;
  text-decoration: none;
  transition: background 0.3s;
  display: flex;
  flex-direction: column;
}

.article-card:hover { background: var(--surface2); }

.article-card-tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 0.75rem;
  transition: color 0.3s;
}

.article-card:hover .article-card-title { color: var(--accent); }

.article-card-excerpt {
  font-size: 0.82rem;
  font-weight: 300;
  color: var(--text-dim);
  line-height: 1.9;
  margin-bottom: 1.5rem;
  flex: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
}

.article-card-arrow {
  color: var(--accent);
  opacity: 0;
  transform: translateX(-8px);
  transition: all 0.3s;
}

.article-card:hover .article-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ══════════════════════════════════════
   ARTICLE DETAIL PAGE
══════════════════════════════════════ */
.article-detail {
  padding: 8rem 3rem 5rem;
  max-width: 800px;
  margin: 0 auto;
  min-height: 60vh;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-decoration: none;
  text-transform: uppercase;
  margin-bottom: 2.5rem;
  transition: color 0.3s;
}

.article-back:hover { color: var(--accent); }

.article-back svg { transition: transform 0.3s; }
.article-back:hover svg { transform: translateX(-3px); }

.article-header-tag {
  font-family: 'Space Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.article-header-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-header-meta {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  display: flex;
  gap: 1.5rem;
}

.article-divider {
  width: 50px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 2.5rem;
}

.article-body {
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 2.2;
  color: var(--text-dim);
  margin-bottom: 4rem;
}

.article-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin: 3rem 0 1rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
}

.article-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 2rem 0 0.75rem;
  letter-spacing: 0.06em;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body strong { color: var(--text); font-weight: 600; }

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-body li {
  padding-left: 0.5rem;
}

.article-body li::marker { color: var(--accent); }

.article-body blockquote {
  border-left: 2px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--accent-dim);
  font-style: italic;
  color: var(--text);
  line-height: 2;
}

.article-abstract {
  font-style: normal !important;
  font-size: 0.82rem;
  padding: 1.5rem 2rem !important;
  border-color: var(--accent) !important;
}

.article-body sup {
  font-size: 0.65rem;
  color: var(--accent);
  vertical-align: super;
  line-height: 0;
  margin-left: 1px;
}

.article-references {
  font-size: 0.75rem !important;
  line-height: 2 !important;
  gap: 0.35rem !important;
}

.article-references li {
  color: var(--text-dim);
  word-break: break-word;
}

.article-related {
  border-top: 1px solid var(--line);
  padding-top: 2.5rem;
}

.article-related-title {
  font-family: 'Space Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.article-related-card {
  text-decoration: none;
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: border-color 0.3s;
}

.article-related-card:hover { border-color: var(--accent); }

.article-related-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.04em;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.article-related-card span {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 960px) {
  nav { padding: 1.25rem 1.5rem; }

  .nav-burger { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(8, 8, 16, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  .nav-links.active { display: flex; }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 1rem 2rem;
    font-size: 0.75rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-links a::after { display: none; }

  .hero { padding: 7rem 1.5rem 4rem; }
  .section { padding: 5rem 1.5rem; }
  .philosophy { padding: 5rem 1.5rem; grid-template-columns: 1fr; gap: 3rem; }
  .architecture { padding: 5rem 1.5rem; }
  .arch-header { grid-template-columns: 1fr; gap: 2rem; }
  .arch-grid { grid-template-columns: 1fr; }
  .methods { padding: 5rem 1.5rem; }
  .methods-header { grid-template-columns: 1fr; gap: 2rem; }
  .method-stages { grid-template-columns: repeat(3, 1fr); }
  .method-stages::before { display: none; }
  .workflow-flow { flex-direction: column; align-items: stretch; }
  .workflow-step::after { display: none; }
  .cases { padding: 5rem 1.5rem; }
  .cases-header { grid-template-columns: 1fr; gap: 2rem; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-card.wide { grid-column: span 1; aspect-ratio: 3/2; }
  .brands { padding: 5rem 1.5rem; }
  .brands-header { grid-template-columns: 1fr; gap: 2rem; }
  .brands-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .cta-section { padding: 5rem 1.5rem; }
  footer { padding: 3rem 1.5rem 1.5rem; flex-direction: column; gap: 2rem; align-items: flex-start; }
  .footer-info { text-align: left; }
  .hero-circle { display: none; }
  .hero-diagram {
    position: absolute;
    left: 50%;
    top: 10%;
    right: auto;
    width: min(50vw, 280px);
    transform: translate(-50%, 0);
    animation: fadeUpCenter 1.2s ease-out 0.9s forwards;
  }
  .hero-orb { width: 180px; height: 180px; right: 5%; }

  .articles-page { padding: 6rem 1.5rem 3rem; }
  .articles-grid { grid-template-columns: 1fr; }
  .article-detail { padding: 6rem 1.5rem 3rem; }
  .article-related-grid { grid-template-columns: 1fr; }
  .modal-box { min-width: auto; margin: 1rem; padding: 2rem 1.5rem; }
}

/* ─── ≤600px : 小屏手机 ─── */
@media (max-width: 600px) {
  nav { padding: 1rem 1rem; }

  .nav-links a { padding: 0.9rem 1.25rem; font-size: 0.7rem; }

  .hero { padding: 6rem 1rem 3rem; min-height: auto; }
  .hero-diagram { top: 8%; width: min(64vw, 220px); }
  .hero-title-en { font-size: clamp(2.6rem, 10vw, 4.5rem); }
  .hero-title-cn { font-size: 0.8rem; letter-spacing: 0.3em; }
  .hero-tagline { font-size: 1.05rem; }
  .hero-slogan { font-size: 0.78rem; line-height: 1.9; }
  .hero-cta-group { flex-direction: column; align-items: flex-start; }
  .hero-orb { width: 120px; height: 120px; right: -5%; opacity: 0.6; }
  .hero-scroll { right: 1rem; bottom: 1.25rem; }
  .hero-scroll-text { font-size: 0.52rem; }

  .section { padding: 3.5rem 1rem; }
  .section-label { margin-bottom: 2rem; }
  .section-label-line { width: 24px; }

  .philosophy { padding: 3.5rem 1rem; gap: 2rem; }
  .philosophy-quote { font-size: 1.4rem; }

  .architecture { padding: 3.5rem 1rem; }
  .arch-card { padding: 2rem 1.5rem; }
  .arch-card-title { font-size: 1.15rem; }

  .methods { padding: 3.5rem 1rem; }
  .method-stages { grid-template-columns: 1fr; }
  .method-stage { padding: 1.5rem 1.25rem; }
  .method-stage::before { display: none; }
  .workflow-step-num { font-size: 1.8rem; }

  .cases { padding: 3.5rem 1rem; }
  .case-card-content { padding: 1.5rem; }
  .case-card-title { font-size: 1.2rem; }

  .brands { padding: 3.5rem 1rem; }
  .brands-grid { grid-template-columns: 1fr; gap: 1rem; }
  .brand-item { min-height: 90px; padding: 2rem 1.5rem; }

  .cta-section { padding: 3.5rem 1rem; }
  .cta-orb { width: 120px; height: 120px; margin-bottom: 2rem; }

  footer { padding: 2.5rem 1rem 1rem; gap: 1.5rem; }
  .footer-brand { font-size: 1.2rem; }
  .footer-copy { padding: 1rem 1rem; font-size: 0.58rem; }

  .articles-page { padding: 5rem 1rem 2rem; }
  .articles-page-title { font-size: clamp(1.5rem, 6vw, 2rem); }
  .article-card { padding: 1.5rem; }
  .article-card-title { font-size: 1rem; }

  .article-detail { padding: 5rem 1rem 2rem; }
  .article-header-title { font-size: 1.4rem; }
  .article-body { font-size: 0.82rem; line-height: 2; }
  .article-body h2 { font-size: 1.1rem; margin: 2rem 0 0.75rem; }
  .article-body h3 { font-size: 0.9rem; }

  .modal-box { padding: 1.5rem 1.25rem; }
  .modal-phone-num { font-size: 1.15rem; }
  .modal-qrcode { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .modal-actions { gap: 0.5rem; }
}

/* ─── 触屏设备 : hover 降级 ─── */
@media (hover: none) {
  .case-card:hover .case-card-bg { transform: none; }
  .case-card:hover .case-card-title { color: var(--text); }
  .case-card:hover .case-card-line { width: 0; }
  .case-card:hover .case-card-pattern { opacity: 0.04; }
  .arch-card:hover .arch-card-icon { opacity: 0.08; }
  .arch-card:hover .arch-diagram { opacity: 0.45; }
  .article-card:hover .article-card-title { color: var(--text); }
  .article-card:hover .article-card-arrow { opacity: 0; transform: translateX(-8px); }
}