/* ─────────────────────────────────────────────────────────────────────────────
   LHASA ZHIYI TECHNOLOGY — Homepage Styles
   Aesthetic: Dark Editorial Precision
   Typographic identity: Cormorant (display) · Syne (UI/labels) · DM Sans (body)
   ──────────────────────────────────────────────────────────────────────────── */

/* ── 0. CSS Custom Properties ── */
:root {
  /* Color palette */
  --bg:            #09090E;
  --bg-alt:        #0F0F16;
  --surface:       #141420;
  --surface-2:     #1C1C2C;
  --border:        #262638;
  --border-hover:  #3A3A54;

  --text:          #EDE8E0;
  --text-muted:    #8A889A;
  --text-dim:      #4A485A;

  --accent:        #C4A462;
  --accent-light:  #D4B47A;
  --accent-dim:    #7A6540;

  /* Typography */
  --font-display:  'Cormorant', 'Georgia', serif;
  --font-ui:       'Syne', sans-serif;
  --font-body:     'DM Sans', sans-serif;

  /* Spacing */
  --space-xs:   0.5rem;
  --space-s:    1rem;
  --space-m:    1.5rem;
  --space-l:    2.5rem;
  --space-xl:   4rem;
  --space-2xl:  6rem;
  --space-3xl:  9rem;

  /* Layout */
  --max-width:  1280px;
  --nav-h:      72px;

  /* Radii */
  --r-s:  4px;
  --r-m:  8px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── 1. Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  color: inherit;
}

em {
  font-style: italic;
  color: var(--accent);
}

/* ── 2. Grain overlay ── */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.032;
  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='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* ── 3. Layout Utilities ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 5rem);
}

.section {
  position: relative;
  padding-block: var(--space-3xl);
}

/* Alternating section backgrounds */
.section:nth-child(even) {
  background-color: var(--bg-alt);
}

/* ── 4. Section Label ── */
.section-label {
  display: flex;
  align-items: center;
  gap: var(--space-s);
  margin-bottom: var(--space-xl);
}

.section-label__num {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  font-style: italic;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.section-label__tag {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  padding-left: var(--space-s);
  position: relative;
}

.section-label__tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: calc(var(--space-s) - 4px);
  height: 1px;
  background: var(--accent);
}

/* ── 5. Typography Scale ── */
.display-heading {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--text);
  letter-spacing: -0.01em;
}

.section__heading {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 3.25rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: var(--space-l);
  letter-spacing: -0.01em;
}

.section__intro {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 56ch;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

/* ── 6. Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.75rem 1.75rem;
  border-radius: var(--r-s);
  transition: background 0.2s var(--ease-out),
              border-color 0.2s var(--ease-out),
              color 0.2s var(--ease-out),
              transform 0.15s var(--ease-out);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
  border: 1px solid var(--accent);
}

.btn--primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-hover);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--large {
  padding: 1rem 2.5rem;
  font-size: 0.875rem;
}

/* ── 7. Reveal Animations ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out),
              transform 0.7s var(--ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

[data-delay="100"] { transition-delay: 0.1s; }
[data-delay="150"] { transition-delay: 0.15s; }
[data-delay="200"] { transition-delay: 0.2s; }
[data-delay="300"] { transition-delay: 0.3s; }
[data-delay="80"]  { transition-delay: 0.08s; }
[data-delay="160"] { transition-delay: 0.16s; }
[data-delay="240"] { transition-delay: 0.24s; }
[data-delay="320"] { transition-delay: 0.32s; }

/* ── 8. Navigation ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(9, 9, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
  border-bottom-color: var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-l);
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 4vw, 4rem);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.nav__brand-mark {
  width: 34px;
  height: 34px;
  border-radius: var(--r-s);
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  font-style: italic;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.nav__brand-name {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav__brand:hover .nav__brand-name {
  color: var(--text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-l);
}

.nav__links a {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease-out);
}

.nav__links a:hover {
  color: var(--text);
}

.nav__links a:hover::after {
  transform: scaleX(1);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-m);
}

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: var(--r-s);
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.lang-toggle__label {
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  padding-right: 0.35rem;
  margin-right: 0.2rem;
  border-right: 1px solid var(--border);
}

.lang-toggle:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.lang-toggle__div {
  color: var(--text-dim);
}

.lang-toggle__opt {
  cursor: pointer;
  transition: color 0.15s;
  padding: 0 0.1rem;
}

.lang-toggle__opt.active {
  color: var(--accent);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}

.nav__hamburger span {
  display: block;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.25s var(--ease-out), opacity 0.25s;
}

.nav__hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: var(--space-m) clamp(1.5rem, 5vw, 3rem);
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
  z-index: 99;
}

.nav__mobile.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav__mobile[aria-hidden="true"] {
  pointer-events: none;
}

.nav__mobile ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.nav__mobile a {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav__mobile a:hover {
  color: var(--accent);
}

/* ── 9. Hero Section ── */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-h) + 3rem);
  padding-bottom: var(--space-3xl);
  overflow: hidden;
}

.hero__bg-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 60% at 15% 90%, rgba(196, 164, 98, 0.07) 0%, transparent 55%),
    radial-gradient(ellipse 50% 70% at 85% 15%, rgba(80, 80, 140, 0.06) 0%, transparent 55%);
  animation: heroGlowPulse 14s ease-in-out infinite alternate;
}

@keyframes heroGlowPulse {
  0%   { opacity: 0.8; }
  100% { opacity: 1; }
}

.hero__decornum {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-55%);
  font-family: var(--font-display);
  font-size: clamp(14rem, 25vw, 28rem);
  font-weight: 700;
  font-style: italic;
  color: var(--text);
  opacity: 0.022;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-l);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.1s forwards;
}

.eyebrow-line {
  display: block;
  width: 3rem;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 7.5vw, 8.5rem);
  font-weight: 600;
  line-height: 1.0;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: var(--space-l);
}

.hero__hl-a {
  display: block;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.2s forwards;
}

.hero__hl-b {
  display: block;
  font-style: italic;
  color: var(--accent);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.35s forwards;
}

.hero__sub {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--text-muted);
  max-width: 52ch;
  line-height: 1.75;
  margin-bottom: var(--space-l);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.5s forwards;
}

.hero__tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--space-xl);
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.6s forwards;
}

.hero__tags-sep {
  color: var(--accent-dim);
  font-size: 0.65rem;
}

.hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.72s forwards;
}

.hero__signal-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-s);
  margin-top: var(--space-xl);
  max-width: 860px;
}

.hero__signal {
  border: 1px solid var(--border);
  background: linear-gradient(145deg, rgba(28, 28, 44, 0.9), rgba(20, 20, 32, 0.78));
  border-radius: var(--r-s);
  padding: 0.85rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.hero__signal-k {
  font-family: var(--font-ui);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__signal-v {
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.hero__vertical-label {
  position: absolute;
  right: clamp(1.5rem, 4vw, 4rem);
  top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: center center;
  font-family: var(--font-ui);
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  opacity: 0;
  animation: fadeIn 1.2s var(--ease-out) 1s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-l);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 0;
  animation: fadeIn 1s var(--ease-out) 1.2s forwards;
}

.hero__scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2.4s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 1; }
  50%       { transform: scaleY(0.5); opacity: 0.4; }
}

/* ── 10. Overview Section ── */
.overview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.overview__lead {
  font-size: 1.075rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-l);
  max-width: 54ch;
}

.value-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.value-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-m);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.6;
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--border);
}

.value-list li::before {
  content: '';
  flex-shrink: 0;
  margin-top: 0.6em;
  width: 20px;
  height: 1px;
  background: var(--accent);
}

/* ── 11. Capabilities Section ── */
.capabilities {
  background-color: var(--bg-alt);
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-m);
  margin-bottom: var(--space-xl);
}

.cap-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  padding: var(--space-xl) var(--space-l) var(--space-l);
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}

.cap-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-4px);
}

.cap-card__bg-num {
  position: absolute;
  top: -0.1em;
  right: -0.05em;
  font-family: var(--font-display);
  font-size: 7rem;
  font-weight: 700;
  font-style: italic;
  color: var(--text);
  opacity: 0.03;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
}

.cap-card__title {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text);
  margin-bottom: var(--space-s);
}

.cap-card__body {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-l);
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--border);
}

.cap-card__list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.cap-card__list li {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cap-card__list li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-dim);
  flex-shrink: 0;
}

/* Supporting services bar */
.supporting-services {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-m);
  padding: var(--space-m) var(--space-l);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
}

.supporting-services__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
  padding-right: var(--space-m);
  border-right: 1px solid var(--border);
}

.supporting-services__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
}

.supporting-services__list li {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--r-s) / 2);
  padding: 0.3rem 0.75rem;
}

/* ── 12. Workflow Section ── */
.workflow__track {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: var(--space-l);
  position: relative;
}

.workflow__step {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  gap: var(--space-s);
  text-align: center;
}

.workflow__step-circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: border-color 0.3s, background 0.3s;
  flex-shrink: 0;
}

.workflow__step-circle span {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  font-style: italic;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.workflow__step:hover .workflow__step-circle {
  background: var(--surface-2);
  border-color: var(--accent-dim);
}

.workflow__step-label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  max-width: 8rem;
  line-height: 1.4;
}

.workflow__connector {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-hover), var(--border));
  margin-top: 26px; /* Center with circle */
  min-width: 20px;
}

.workflow__footnote {
  font-size: 0.8125rem;
  color: var(--text-dim);
  font-style: italic;
  font-family: var(--font-display);
}

/* ── 13. Solutions Section ── */
.solutions {
  background-color: var(--bg-alt);
}

.content-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-m);
  margin-bottom: var(--space-xl);
}

.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  padding: var(--space-l);
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}

.content-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-4px);
}

.content-card__type {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(196, 164, 98, 0.08);
  border: 1px solid rgba(196, 164, 98, 0.2);
  border-radius: var(--r-s);
  padding: 0.2rem 0.6rem;
  margin-bottom: var(--space-s);
}

.content-card h3 {
  font-family: var(--font-ui);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-xs);
}

.content-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Enterprise solutions sub-section */
.enterprise-solutions {
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  overflow: hidden;
}

.enterprise-solutions__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: var(--space-m) var(--space-l);
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.enterprise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.enterprise-item {
  padding: var(--space-l);
  border-right: 1px solid var(--border);
  transition: background 0.2s;
}

.enterprise-item:last-child {
  border-right: none;
}

.enterprise-item:hover {
  background: var(--surface);
}

.enterprise-item h4 {
  font-family: var(--font-ui);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.enterprise-item p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── 14. Technical Depth Section ── */
.tech-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.tech-col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  padding: var(--space-xl) var(--space-l) var(--space-l);
}

.tech-col__title {
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-l);
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--border);
}

.tech-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.tech-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.tech-list li::before {
  content: '→';
  flex-shrink: 0;
  color: var(--accent-dim);
  font-family: var(--font-body);
  margin-top: 0.05em;
}

/* ── 15. Proof Section ── */
.proof {
  background-color: var(--bg-alt);
}

.proof-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-m);
  margin-bottom: var(--space-xl);
}

.proof-metric {
  text-align: center;
  padding: var(--space-xl) var(--space-m);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
}

.proof-metric__num {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 7vw, 6rem);
  font-weight: 700;
  font-style: italic;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.proof-metric__label {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.proof-metric__sub {
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--text-dim);
  font-style: italic;
  font-family: var(--font-display);
}

/* Case tags */
.proof-cases {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  padding: var(--space-l);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-m);
}

.proof-cases__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
  padding-right: var(--space-m);
  border-right: 1px solid var(--border);
}

.proof-cases__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
}

.proof-cases__tags span {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-s);
  padding: 0.35rem 0.85rem;
}

/* ── 16. Founder Section ── */
.founder-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.founder-portrait {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-m);
}

.founder-portrait__frame {
  width: 200px;
  height: 200px;
  border-radius: var(--r-m);
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.founder-portrait__frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(196, 164, 98, 0.08) 0%,
    transparent 60%);
}

.founder-portrait__initials {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 600;
  font-style: italic;
  color: var(--accent);
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
  text-align: center;
}

.founder-portrait__line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--accent-dim), transparent);
}

.founder-bio__name {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
  letter-spacing: -0.01em;
}

.founder-bio__title {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-l);
}

.founder-bio__body {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 52ch;
  margin-bottom: var(--space-l);
}

.founder-bio__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.founder-bio__tags span {
  font-family: var(--font-ui);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-s);
  padding: 0.3rem 0.75rem;
  transition: border-color 0.2s, color 0.2s;
}

.founder-bio__tags span:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
}

/* ── 17. CTA Section ── */
.cta {
  position: relative;
  background-color: var(--bg);
  text-align: center;
  overflow: hidden;
}

.cta__bg-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 80% 50% at 50% 60%, rgba(196, 164, 98, 0.07) 0%, transparent 60%);
}

.cta__inner {
  position: relative;
  z-index: 1;
}

.cta__headline {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 6rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-l);
}

.cta__body {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 46ch;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
  line-height: 1.75;
}

.cta__buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-bottom: var(--space-m);
}

.cta__notice {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-style: italic;
  color: var(--text-dim);
}

/* ── 18. Footer ── */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding-block: var(--space-xl);
}

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

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer__brand-en {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.footer__brand-cn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.footer__meta {
  display: flex;
  gap: var(--space-s);
  font-family: var(--font-ui);
  font-size: 0.69rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ── 19. Keyframe Animations ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── 20. Responsive ── */

/* Tablet: 768px–1024px */
@media (max-width: 1024px) {
  .lang-toggle__label {
    display: none;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .cap-grid {
    grid-template-columns: 1fr 1fr;
  }

  .overview__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .proof-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .founder-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .founder-portrait {
    flex-direction: row;
    align-items: center;
  }

  .founder-portrait__line {
    display: none;
  }

  .enterprise-grid {
    grid-template-columns: 1fr;
  }

  .enterprise-item {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .enterprise-item:last-child {
    border-bottom: none;
  }

  .tech-split {
    grid-template-columns: 1fr;
    gap: var(--space-l);
  }
}

/* Mobile: ≤ 640px */
@media (max-width: 640px) {
  :root {
    --space-3xl: 5rem;
    --space-2xl: 3.5rem;
    --space-xl:  2.5rem;
  }

  .hero__vertical-label {
    display: none;
  }

  .hero__signal-rail {
    grid-template-columns: 1fr;
    margin-top: var(--space-l);
    gap: 0.65rem;
  }

  .hero__signal {
    padding: 0.8rem;
  }

  .hero__signal-k {
    font-size: 0.58rem;
    letter-spacing: 0.12em;
  }

  .hero__signal-v {
    font-size: 0.79rem;
  }

  .hero__decornum {
    font-size: 45vw;
    opacity: 0.015;
  }

  .cap-grid {
    grid-template-columns: 1fr;
  }

  .content-cards {
    grid-template-columns: 1fr;
  }

  .proof-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .workflow__track {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .workflow__step {
    flex-direction: row;
    text-align: left;
    gap: var(--space-m);
    padding: var(--space-m) 0;
    align-items: center;
  }

  .workflow__step-label {
    max-width: none;
    font-size: 0.8rem;
  }

  .workflow__connector {
    width: 1px;
    height: 32px;
    background: linear-gradient(to bottom, var(--border-hover), var(--border));
    margin-left: 25px; /* Center under circle */
    margin-top: 0;
    min-width: unset;
    flex: none;
  }

  .cta__buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .hero__cta-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .proof-cases {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-m);
  }

  .proof-cases__label {
    border-right: none;
    padding-right: 0;
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--border);
  }

  .supporting-services {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-s);
  }

  .supporting-services__label {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-right: 0;
    padding-bottom: var(--space-xs);
  }
}

/* ── 21. Focus styles for accessibility ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-s);
}

/* ── 22. Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .hero__eyebrow,
  .hero__hl-a,
  .hero__hl-b,
  .hero__sub,
  .hero__tags,
  .hero__cta-row,
  .hero__vertical-label,
  .hero__scroll {
    animation: none;
    opacity: 1;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__bg-glow {
    animation: none;
  }

  .hero__scroll-line {
    animation: none;
  }
}