/* ==========================================================================
   Siyou Tech — SaaS Bento Design System
   Tokens · Reset · Layout · Components · Sections · Responsive · Motion
   ========================================================================== */

/* ----- Tokens ------------------------------------------------------------ */
:root {
  /* Color */
  --c-primary: #0F172A;
  --c-primary-700: #1E293B;
  --c-primary-600: #334155;
  --c-on-primary: #FFFFFF;
  --c-text: #020617;
  --c-text-muted: #475569;
  --c-text-subtle: #64748B;
  --c-bg: #F8FAFC;
  --c-surface: #FFFFFF;
  --c-bg-soft: #F1F5F9;
  --c-muted: #E8ECF1;
  --c-border: #E2E8F0;
  --c-border-strong: #CBD5E1;
  --c-accent: #0369A1;
  --c-accent-hover: #075985;
  --c-blue-500: #2563EB;
  --c-blue-600: #1D4ED8;
  --c-success: #10B981;
  --c-danger: #DC2626;

  /* Gradients */
  --grad-cta: linear-gradient(135deg, #0052FF 0%, #4D7CFF 100%);
  --grad-cta-hover: linear-gradient(135deg, #003ECC 0%, #3D6CEF 100%);
  --grad-mesh:
    radial-gradient(60% 80% at 18% 0%, rgba(77, 124, 255, 0.18), transparent 60%),
    radial-gradient(60% 60% at 100% 18%, rgba(0, 82, 255, 0.14), transparent 60%);

  /* Typography */
  --f-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* Spacing (4pt) */
  --s-1: 4px;  --s-2: 8px;   --s-3: 12px; --s-4: 16px;
  --s-5: 20px; --s-6: 24px;  --s-8: 32px; --s-10: 40px;
  --s-12: 48px;--s-16: 64px; --s-20: 80px;--s-24: 96px;

  /* Radius */
  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 20px; --r-2xl: 28px; --r-full: 999px;

  /* Shadows */
  --sh-1: 0 1px 2px rgba(15,23,42,0.04), 0 1px 1px rgba(15,23,42,0.02);
  --sh-2: 0 4px 12px -2px rgba(15,23,42,0.06), 0 2px 4px rgba(15,23,42,0.04);
  --sh-3: 0 12px 32px -8px rgba(15,23,42,0.10), 0 4px 12px rgba(15,23,42,0.05);
  --sh-4: 0 24px 64px -16px rgba(15,23,42,0.14), 0 8px 24px rgba(15,23,42,0.06);
  --sh-cta: 0 8px 20px -6px rgba(0, 82, 255, 0.45);
  --sh-cta-hover: 0 16px 32px -8px rgba(0, 82, 255, 0.55);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --d-fast: 150ms;
  --d-base: 220ms;
  --d-slow: 320ms;

  /* Z-index */
  --z-nav: 100;
  --z-dropdown: 200;
  --z-modal: 1000;
}

/* ----- Reset ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  padding-top: 64px;
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; transition: color var(--d-fast) var(--ease-out); }
button { font-family: inherit; cursor: pointer; }
ul { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--c-primary);
  margin: 0;
}
:focus-visible {
  outline: 2px solid var(--c-blue-500);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ----- Layout ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--s-6);
}
@media (min-width: 1024px) { .container { padding: 0 var(--s-8); } }

.section { padding: var(--s-20) 0; }
.section.alt { background: var(--c-bg-soft); }
@media (max-width: 768px) { .section { padding: var(--s-16) 0; } }

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  margin-bottom: var(--s-12);
  text-align: center;
}
.section-title::before {
  content: attr(data-kicker);
  display: block;
  font-family: var(--f-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--s-3);
}

/* Eyebrow / Kicker pill (used in hero + page header) */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: rgba(3, 105, 161, 0.08);
  border: 1px solid rgba(3, 105, 161, 0.18);
  padding: 6px 14px;
  border-radius: var(--r-full);
  margin-bottom: var(--s-5);
}
.kicker::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(3, 105, 161, 0.18);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

/* Legacy bracket / underline decorations from old developer theme */
.bracket, .hero-underline { display: none; }

/* ----- Buttons ----------------------------------------------------------- */
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--f-body);
  font-weight: 600;
  font-size: 15px;
  padding: 14px 24px;
  border-radius: var(--r-md);
  border: 0;
  background: var(--grad-cta);
  color: #fff;
  box-shadow: var(--sh-cta);
  transition: transform var(--d-fast) var(--ease-spring),
              box-shadow var(--d-base) var(--ease-out),
              background var(--d-base) var(--ease-out);
  white-space: nowrap;
  cursor: pointer;
}
.cta-button i { transition: transform var(--d-base) var(--ease-spring); }
.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--sh-cta-hover);
  background: var(--grad-cta-hover);
}
.cta-button:hover i { transform: translateX(3px); }
.cta-button:active { transform: translateY(0) scale(0.98); }
.cta-button.ghost {
  background: transparent;
  color: var(--c-primary);
  border: 1px solid var(--c-border-strong);
  box-shadow: none;
}
.cta-button.ghost:hover {
  background: var(--c-surface);
  border-color: var(--c-primary);
  box-shadow: var(--sh-2);
}

/* Tech chips */
.tech-chip {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: var(--r-full);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
  transition: all var(--d-fast) var(--ease-out);
}
.tech-chip:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ----- Navbar ------------------------------------------------------------ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: background var(--d-base) var(--ease-out),
              box-shadow var(--d-base) var(--ease-out);
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--sh-1);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo { display: flex; align-items: center; gap: var(--s-2); }
.logo a { display: flex; align-items: center; }
.logo img { height: 32px; width: auto; }
.logo-text {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-primary);
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links > li { position: relative; }
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-muted);
  border-radius: var(--r-sm);
  transition: all var(--d-fast) var(--ease-out);
}
.nav-item:hover { color: var(--c-primary); background: var(--c-bg-soft); }
.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-menu {
  position: absolute;
  top: 100%; left: 0;
  min-width: 180px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  box-shadow: var(--sh-3);
  padding: 6px;
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all var(--d-base) var(--ease-out);
  z-index: var(--z-dropdown);
}
.dropdown-menu .nav-item { display: block; padding: 8px 12px; width: 100%; }
.mobile-menu {
  display: none;
  font-size: 22px;
  color: var(--c-primary);
  cursor: pointer;
  padding: 6px;
}
@media (max-width: 1023px) {
  .nav-links {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: #fff;
    border-top: 1px solid var(--c-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    transform: translateY(-12px);
    opacity: 0; visibility: hidden;
    transition: all var(--d-base) var(--ease-out);
    box-shadow: var(--sh-3);
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
  }
  .nav-links.active { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-links .nav-item { padding: 12px 16px; font-size: 16px; }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: 0;
    padding: 0 0 0 16px;
    margin: 0;
    opacity: 1; visibility: visible; transform: none;
  }
  .mobile-menu { display: block; }
}

/* ----- Hero -------------------------------------------------------------- */
.hero {
  padding: var(--s-16) 0 var(--s-20);
  background: var(--c-bg);
  background-image: var(--grad-mesh);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
          mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
  pointer-events: none;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--s-16);
  align-items: center;
  position: relative;
}
.hero-text h1 {
  font-size: clamp(36px, 5.4vw, 64px);
  margin: var(--s-2) 0 var(--s-5);
}
.hero-text h1 .gradient {
  background: var(--grad-cta);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.lead {
  font-size: 17px;
  color: var(--c-text-muted);
  margin: 0 0 var(--s-6);
  line-height: 1.7;
  max-width: 540px;
}
.hero-stack {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: var(--s-8);
}
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.claim-mark {
  font-size: 0.42em;
  color: var(--c-text-subtle);
  font-weight: 500;
  vertical-align: super;
  margin-left: 3px;
  -webkit-text-fill-color: var(--c-text-subtle);
}
.hero-disclaimer {
  margin: var(--s-5) 0 0;
  font-size: 12px;
  color: var(--c-text-subtle);
  line-height: 1.55;
  max-width: 540px;
}
.hero-disclaimer sup { margin-right: 2px; }

/* Hero visual: bento preview */
.hero-visual {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--s-3);
  position: relative;
}
.hv-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  box-shadow: var(--sh-2);
  transition: transform var(--d-slow) var(--ease-spring),
              box-shadow var(--d-slow) var(--ease-out);
}
.hv-card:hover { transform: translateY(-3px); box-shadow: var(--sh-3); }
.hv-card .label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-subtle);
  font-weight: 600;
}
.hv-card .value {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 32px;
  color: var(--c-primary);
  line-height: 1.1;
  margin-top: 6px;
  letter-spacing: -0.02em;
}
.hv-card .value sup {
  font-size: 16px;
  background: var(--grad-cta);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  margin-left: 2px;
  top: -0.6em;
}
.hv-card .desc { font-size: 13px; color: var(--c-text-muted); margin-top: 8px; }
.hv-card.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: #fff;
  border: 0;
  position: relative;
  overflow: hidden;
}
.hv-card.featured::after {
  content: "";
  position: absolute;
  inset: -2px;
  background: var(--grad-mesh);
  opacity: 0.6;
  pointer-events: none;
}
.hv-card.featured > * { position: relative; z-index: 1; }
.hv-card.featured .label { color: rgba(255, 255, 255, 0.65); }
.hv-card.featured .value { color: #fff; }
.hv-card.featured .desc { color: rgba(255, 255, 255, 0.78); }
.hv-icon {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(0, 82, 255, 0.12);
  color: var(--c-blue-500);
  margin-bottom: var(--s-3);
  font-size: 16px;
}
.hv-card.featured .hv-icon {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}
.hv-bars {
  display: flex; align-items: flex-end; gap: 6px;
  height: 56px;
  margin-top: var(--s-3);
}
.hv-bars span {
  flex: 1;
  background: linear-gradient(180deg, #4D7CFF 0%, #0052FF 100%);
  border-radius: 3px;
  opacity: 0.9;
  animation: bar-rise 1.2s var(--ease-out) both;
}
.hv-bars span:nth-child(1) { height: 38%; animation-delay: 0.05s; }
.hv-bars span:nth-child(2) { height: 62%; animation-delay: 0.12s; }
.hv-bars span:nth-child(3) { height: 48%; animation-delay: 0.20s; }
.hv-bars span:nth-child(4) { height: 80%; animation-delay: 0.28s; }
.hv-bars span:nth-child(5) { height: 95%; animation-delay: 0.36s; }
.hv-bars span:nth-child(6) { height: 70%; animation-delay: 0.44s; }
@keyframes bar-rise {
  from { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
  to { transform: scaleY(1); opacity: 0.9; }
}

/* Old terminal markup hidden (replaced by .hero-visual) */
.hero-terminal { display: none; }

@media (max-width: 1023px) {
  .hero .container { grid-template-columns: 1fr; gap: var(--s-10); }
  .hero-visual { max-width: 540px; }
}

/* ----- Impact Strip ------------------------------------------------------ */
.impact-strip {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-soft) 100%);
  padding: var(--s-12) 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-6);
}
.impact-item { text-align: center; padding: var(--s-4); }
.impact-item .num {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(36px, 4vw, 52px);
  color: var(--c-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}
.impact-item .num span {
  background: var(--grad-cta);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.impact-item .label {
  display: block;
  margin-top: var(--s-2);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
}
.impact-item .desc { margin-top: var(--s-2); color: var(--c-text-muted); font-size: 14px; }
@media (max-width: 768px) { .impact-grid { grid-template-columns: repeat(2, 1fr); } }

/* ----- Advantages -------------------------------------------------------- */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.advantage-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  position: relative;
  overflow: hidden;
  transition: transform var(--d-slow) var(--ease-spring),
              box-shadow var(--d-slow) var(--ease-out),
              border-color var(--d-base) var(--ease-out);
}
.advantage-item::after {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 140px; height: 140px;
  background: radial-gradient(circle at 0 0, rgba(0, 82, 255, 0.08), transparent 70%);
  pointer-events: none;
}
.advantage-item:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
  box-shadow: var(--sh-3);
}
.advantage-item .ico {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.12), rgba(77, 124, 255, 0.12));
  color: var(--c-blue-600);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: var(--s-5);
}
.advantage-item h3 { font-size: 20px; margin-bottom: var(--s-2); }
.advantage-item p {
  color: var(--c-text-muted);
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}
@media (max-width: 768px) { .advantage-grid { grid-template-columns: 1fr; } }

/* ----- Services (Bento, 5 cards) ---------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--s-5);
}
.service-item {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  transition: transform var(--d-slow) var(--ease-spring),
              box-shadow var(--d-slow) var(--ease-out),
              border-color var(--d-base);
  overflow: hidden;
  position: relative;
}
.service-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-3);
  border-color: var(--c-accent);
}
.service-item--ai { grid-column: span 3; }
.service-item--web { grid-column: span 3; }
.service-item--soft { grid-column: span 2; }
.service-item--ent { grid-column: span 2; }
.service-item--global { grid-column: span 2; }
@media (max-width: 1023px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .service-item { grid-column: span 1 !important; }
  .service-item--ai { grid-column: span 2 !important; }
}
@media (max-width: 600px) {
  .services-grid { grid-template-columns: 1fr; }
  .service-item, .service-item--ai { grid-column: span 1 !important; }
}
.service-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
}
.service-head i {
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.10), rgba(77, 124, 255, 0.10));
  color: var(--c-blue-600);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.service-head::after {
  content: attr(data-tag);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-subtle);
  background: var(--c-bg-soft);
  padding: 4px 10px;
  border-radius: var(--r-full);
  font-family: var(--f-mono);
}
.service-body h3 { font-size: 19px; margin-bottom: var(--s-3); }
.service-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--s-4);
}
.service-list li {
  position: relative;
  padding-left: 22px;
  color: var(--c-text-muted);
  font-size: 14.5px;
  line-height: 1.55;
}
.service-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: rgba(3, 105, 161, 0.10);
  border: 1px solid rgba(3, 105, 161, 0.30);
}
.service-list li::after {
  content: "";
  position: absolute;
  left: 4px; top: 12px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
}
.service-stack { display: flex; flex-wrap: wrap; gap: 6px; }

/* ----- Tech Stack -------------------------------------------------------- */
.tech-stack-grid { display: flex; flex-direction: column; gap: var(--s-3); }
.tech-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--s-5);
  align-items: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5) var(--s-6);
  transition: border-color var(--d-base) var(--ease-out),
              box-shadow var(--d-base) var(--ease-out);
}
.tech-row:hover { border-color: var(--c-border-strong); box-shadow: var(--sh-1); }
.tech-row .label {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
}
.tech-row .items { display: flex; flex-wrap: wrap; gap: 8px; }
.ti {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: var(--r-sm);
  background: var(--c-bg-soft);
  color: var(--c-primary);
  border: 1px solid transparent;
  transition: all var(--d-fast) var(--ease-out);
}
.ti:hover {
  background: #fff;
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-1px);
}
.ti i { color: var(--c-blue-500); }
@media (max-width: 768px) {
  .tech-row { grid-template-columns: 1fr; gap: var(--s-3); padding: var(--s-4); }
}

/* ----- Industries -------------------------------------------------------- */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
.industry-item {
  display: flex;
  gap: var(--s-4);
  align-items: flex-start;
  padding: var(--s-5);
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  border-radius: var(--r-lg);
  transition: all var(--d-base) var(--ease-out);
}
.industry-item:hover {
  border-color: var(--c-accent);
  box-shadow: var(--sh-2);
  transform: translateY(-2px);
}
.industry-item > i {
  width: 40px; height: 40px;
  border-radius: var(--r-sm);
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.10), rgba(77, 124, 255, 0.10));
  color: var(--c-blue-600);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.industry-content h4 { font-size: 16px; margin: 0 0 4px; }
.industry-content p { color: var(--c-text-muted); font-size: 14px; margin: 0; }
@media (max-width: 768px) { .industries-grid { grid-template-columns: 1fr; } }

/* ----- Workflow ---------------------------------------------------------- */
.workflow-shell {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-2xl);
  padding: var(--s-10);
  box-shadow: var(--sh-1);
}
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--s-5);
  position: relative;
}
.workflow-grid::before {
  content: "";
  position: absolute;
  top: 28px; left: 8%; right: 8%;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--c-border-strong) 8%,
    var(--c-border-strong) 92%,
    transparent 100%);
  z-index: 0;
}
.workflow-item { text-align: center; position: relative; z-index: 1; }
.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-text-muted);
  margin: 0 auto var(--s-3);
  transition: all var(--d-base) var(--ease-out);
}
.workflow-item:hover .step-no {
  border-color: var(--c-accent);
  color: #fff;
  background: var(--grad-cta);
  transform: scale(1.06);
  box-shadow: 0 8px 16px -4px rgba(0, 82, 255, 0.45);
}
.workflow-item .ico { display: none; }
.workflow-item h3 { font-size: 16px; margin-bottom: 4px; }
.workflow-item p { font-size: 13px; color: var(--c-text-muted); margin: 0; }
@media (max-width: 1023px) {
  .workflow-grid { grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
  .workflow-grid::before { display: none; }
}
@media (max-width: 600px) {
  .workflow-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-shell { padding: var(--s-6); }
}

/* ----- Cases ------------------------------------------------------------- */
.case-grid,
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.case-item,
.case-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--d-slow) var(--ease-spring),
              box-shadow var(--d-slow) var(--ease-out),
              border-color var(--d-base);
  display: flex;
  flex-direction: column;
}
.case-item:hover,
.case-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
  box-shadow: var(--sh-3);
}
.case-item > img,
.case-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--c-bg-soft);
  transition: transform var(--d-slow) var(--ease-out);
}
.case-image { overflow: hidden; }
.case-item:hover > img,
.case-card:hover .case-image img { transform: scale(1.04); }
.case-content {
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  flex: 1;
}
.case-content h3 { font-size: 17px; margin: 0; }
.case-content h3::before {
  content: attr(data-no);
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--c-accent);
  background: rgba(3, 105, 161, 0.10);
  padding: 3px 8px;
  border-radius: var(--r-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-right: 8px;
  vertical-align: middle;
}
.case-content p {
  color: var(--c-text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
@media (max-width: 1023px) {
  .case-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .case-grid, .cases-grid { grid-template-columns: 1fr; }
}
.more-cases-wrapper {
  display: flex;
  justify-content: center;
  margin-top: var(--s-10);
}
.more-cases-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 12px 24px;
  border-radius: var(--r-md);
  background: var(--c-surface);
  color: var(--c-primary);
  border: 1px solid var(--c-border-strong);
  font-weight: 600;
  font-size: 14px;
  transition: all var(--d-base) var(--ease-out);
}
.more-cases-btn:hover {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  transform: translateY(-1px);
  box-shadow: var(--sh-2);
}
.more-cases-btn i { transition: transform var(--d-base) var(--ease-spring); }
.more-cases-btn:hover i { transform: translateX(3px); }

/* ----- Partners ---------------------------------------------------------- */
.partner-grid {
  display: flex;
  flex-direction: column;
  gap: var(--s-6);
  align-items: center;
}
.partner-row-1, .partner-row-2 {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-10);
  justify-content: center;
  align-items: center;
  width: 100%;
}
.partner-grid img {
  height: 56px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  filter: grayscale(1) opacity(0.6);
  transition: filter var(--d-base) var(--ease-out),
              transform var(--d-base) var(--ease-spring);
}
.partner-grid img:hover { filter: grayscale(0) opacity(1); transform: scale(1.06); }

/* ----- Contact ----------------------------------------------------------- */
.contact-section { background: var(--c-bg-soft); }
.contact-info {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--s-8);
  align-items: stretch;
}
.contact-list { display: flex; flex-direction: column; gap: var(--s-4); }
.contact-item {
  display: flex;
  gap: var(--s-4);
  align-items: flex-start;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-5);
  transition: all var(--d-base) var(--ease-out);
}
.contact-item:hover { border-color: var(--c-accent); box-shadow: var(--sh-2); transform: translateY(-2px); }
.contact-item > i {
  width: 40px; height: 40px; flex-shrink: 0;
  border-radius: var(--r-sm);
  background: rgba(0, 82, 255, 0.10);
  color: var(--c-blue-600);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.ci-body h3 {
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--c-text-subtle);
  margin: 0 0 4px;
}
.ci-body p { margin: 0; color: var(--c-primary); font-size: 15px; font-weight: 500; }
.contact-qrcard {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1E293B 100%);
  color: #fff;
  border-radius: var(--r-lg);
  padding: var(--s-6);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-3);
  position: relative;
  overflow: hidden;
}
.contact-qrcard::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-mesh);
  opacity: 0.5;
  pointer-events: none;
}
.contact-qrcard > * { position: relative; z-index: 1; }
.contact-qrcard .label {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 600;
}
.contact-qrcard h3 { color: #fff; font-size: 18px; }
.contact-qrcard .qrcode-img {
  width: 160px; height: 160px;
  background: #fff;
  padding: 8px;
  border-radius: var(--r-md);
}
.contact-qrcard .hint { font-size: 13px; color: rgba(255, 255, 255, 0.78); }
@media (max-width: 1023px) { .contact-info { grid-template-columns: 1fr; } }

/* ----- Page header (about, cases) --------------------------------------- */
.page-header {
  padding: var(--s-16) 0 var(--s-12);
  text-align: center;
  background: var(--c-bg);
  background-image: var(--grad-mesh);
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
          mask-image: radial-gradient(80% 60% at 50% 30%, #000 0%, transparent 75%);
  pointer-events: none;
}
.page-header .container { position: relative; }
.page-header h1 {
  font-size: clamp(36px, 5vw, 56px);
  margin: var(--s-3) 0;
}
.page-header p {
  color: var(--c-text-muted);
  font-size: 17px;
  max-width: 580px;
  margin: 0 auto;
}

/* ----- About page -------------------------------------------------------- */
.about-intro {
  max-width: 820px;
  margin: 0 auto var(--s-12);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-muted);
  box-shadow: var(--sh-1);
}
.about-intro p { margin: 0; }
.about-intro strong { color: var(--c-primary); font-weight: 600; }
.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--s-8);
  transition: transform var(--d-slow) var(--ease-spring),
              box-shadow var(--d-slow) var(--ease-out),
              border-color var(--d-base);
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-accent);
  box-shadow: var(--sh-3);
}
.feature-card::after {
  content: "";
  position: absolute;
  inset: auto -20px -20px auto;
  width: 140px; height: 140px;
  background: radial-gradient(circle at 100% 100%, rgba(0, 82, 255, 0.08), transparent 70%);
  pointer-events: none;
}
.feature-icon {
  width: 52px; height: 52px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(0, 82, 255, 0.12), rgba(77, 124, 255, 0.12));
  color: var(--c-blue-600);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px;
  margin-bottom: var(--s-5);
}
.feature-card h2 { font-size: 22px; margin-bottom: var(--s-3); }
.feature-card p { color: var(--c-text-muted); font-size: 15px; line-height: 1.7; margin: 0; }
@media (max-width: 768px) { .about-features { grid-template-columns: 1fr; } }

/* ----- Footer ------------------------------------------------------------ */
.footer {
  background: var(--c-primary);
  color: rgba(255, 255, 255, 0.75);
  padding: var(--s-12) 0 var(--s-8);
}
.footer-content { display: flex; justify-content: center; }
.footer-info { text-align: center; max-width: 720px; }
.footer .copyright {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 15px;
  color: #fff;
  margin: 0 0 var(--s-2);
}
.footer .signature {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin: 0 0 var(--s-4);
}
.footer .icp, .footer .police-beian {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin: 4px 0;
}
.footer a { color: rgba(255, 255, 255, 0.7); }
.footer a:hover { color: #fff; }
.footer .police-beian a { display: inline-flex; align-items: center; gap: 6px; }
.footer .police-beian img { width: 18px; height: 18px; }

/* ----- Back to top ------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: var(--s-6);
  right: var(--s-6);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--grad-cta);
  color: #fff;
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: 0 12px 28px -8px rgba(0, 82, 255, 0.45);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--d-base) var(--ease-out),
              transform var(--d-base) var(--ease-spring),
              box-shadow var(--d-base) var(--ease-out);
  z-index: 80;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px -8px rgba(0, 82, 255, 0.55);
}

/* ----- Chat widget ------------------------------------------------------- */
.chat-container {
  position: fixed;
  bottom: 84px;
  right: var(--s-6);
  z-index: 90;
}
.chat-toggle {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  box-shadow: var(--sh-3);
  transition: transform var(--d-base) var(--ease-spring),
              box-shadow var(--d-base) var(--ease-out);
  animation: float 4s ease-in-out infinite;
}
.chat-toggle:hover {
  transform: scale(1.06);
  box-shadow: var(--sh-4);
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.chat-window {
  width: min(360px, calc(100vw - 32px));
  height: min(540px, calc(100dvh - 200px));
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-4);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: absolute;
  bottom: 72px;
  right: 0;
  transform-origin: bottom right;
  transition: transform var(--d-base) var(--ease-spring),
              opacity var(--d-base) var(--ease-out);
}
.chat-window.hidden {
  transform: scale(0.95) translateY(8px);
  opacity: 0;
  pointer-events: none;
}
.chat-header {
  background: var(--c-primary);
  color: #fff;
  padding: var(--s-4) var(--s-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-header h3 {
  color: #fff;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.chat-header h3 i { color: #4D7CFF; }
.close-chat {
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  border: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--d-fast);
}
.close-chat:hover { background: rgba(255, 255, 255, 0.20); }
.chat-messages {
  flex: 1;
  padding: var(--s-4);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  background: var(--c-bg-soft);
}
.chat-message {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: var(--r-md);
  font-size: 14px;
  line-height: 1.55;
}
.chat-message p { margin: 0; }
.assistant-message {
  background: #fff;
  color: var(--c-primary);
  border: 1px solid var(--c-border);
  align-self: flex-start;
  border-top-left-radius: 4px;
}
.user-message {
  background: var(--grad-cta);
  color: #fff;
  align-self: flex-end;
  border-top-right-radius: 4px;
}
.quick-questions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: var(--s-2);
}
.quick-question-btn {
  text-align: left;
  font-size: 13px;
  padding: 9px 12px;
  background: #fff;
  border: 1px solid var(--c-border);
  color: var(--c-primary);
  border-radius: var(--r-sm);
  transition: all var(--d-fast) var(--ease-out);
  cursor: pointer;
  font-family: inherit;
}
.quick-question-btn:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(3, 105, 161, 0.04);
}
.chat-input-container {
  display: flex;
  gap: 8px;
  padding: var(--s-3);
  background: #fff;
  border-top: 1px solid var(--c-border);
}
#chat-input {
  flex: 1;
  height: 40px;
  padding: 0 12px;
  font-size: 14px;
  font-family: inherit;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  outline: none;
  transition: border-color var(--d-fast);
}
#chat-input:focus { border-color: var(--c-accent); }
#send-message {
  width: 40px; height: 40px;
  border-radius: var(--r-sm);
  background: var(--grad-cta);
  color: #fff;
  border: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--d-fast) var(--ease-spring);
}
#send-message:hover { transform: scale(1.05); }

/* Chat: thinking indicator */
.thinking-text { display: flex; align-items: center; gap: 8px; }
.thinking-main { color: var(--c-text-muted); font-size: 13px; }
.thinking { display: inline-flex; gap: 4px; }
.thinking span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--c-accent);
  animation: dot-blink 1.2s ease-in-out infinite;
}
.thinking span:nth-child(2) { animation-delay: 0.15s; }
.thinking span:nth-child(3) { animation-delay: 0.30s; }
@keyframes dot-blink {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-2px); }
}
.thinking-timer { font-size: 11px; color: var(--c-text-subtle); }

/* ----- Scroll-reveal ----------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out),
              transform 0.6s var(--ease-out);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Reduced motion ---------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}