/* ========================================
   Tianhuic — Modular West Inc
   Premium Enterprise AI Website
   ======================================== */

:root {
  --color-bg: #08090c;
  --color-bg-elevated: #0f1117;
  --color-bg-muted: #13151c;
  --color-bg-card: #161820;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-hover: rgba(255, 255, 255, 0.12);
  --color-text: #e8eaef;
  --color-text-muted: #8b919e;
  --color-text-subtle: #5c6370;
  --color-accent: #6ee7c4;
  --color-accent-dim: rgba(110, 231, 196, 0.12);
  --color-accent-glow: rgba(110, 231, 196, 0.25);
  --color-white: #ffffff;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 72px;
  --container-max: 1200px;
  --section-padding: clamp(80px, 12vw, 140px);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Typography ---- */
em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

/* ---- Header ---- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(8, 9, 12, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(8, 9, 12, 0.92);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #34d399);
  color: var(--color-bg);
  font-weight: 600;
  font-size: 18px;
  border-radius: var(--radius-sm);
}

.logo-text {
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.logo-by {
  color: var(--color-text-muted);
  font-weight: 400;
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

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

.nav-cta {
  padding: 8px 18px !important;
  background: var(--color-accent-dim);
  color: var(--color-accent) !important;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(110, 231, 196, 0.2);
  transition: background var(--transition), border-color var(--transition) !important;
}

.nav-cta:hover {
  background: rgba(110, 231, 196, 0.2);
  border-color: rgba(110, 231, 196, 0.35);
  color: var(--color-accent) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.nav-toggle.active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: #5dd9b5;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--color-accent-glow);
}

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

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.03);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid rgba(110, 231, 196, 0.3);
}

.btn-outline:hover {
  background: var(--color-accent-dim);
  border-color: rgba(110, 231, 196, 0.5);
}

.btn-full {
  width: 100%;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

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

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
}

.hero-glow--1 {
  width: 600px;
  height: 600px;
  top: -10%;
  right: -5%;
  background: rgba(110, 231, 196, 0.08);
}

.hero-glow--2 {
  width: 400px;
  height: 400px;
  bottom: 10%;
  left: -5%;
  background: rgba(99, 102, 241, 0.06);
}

.hero-content {
  position: relative;
  padding: 80px 24px 100px;
  max-width: 820px;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(42px, 7vw, 72px);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}

.hero-title em {
  color: var(--color-text-muted);
}

.hero-lead {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 620px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.stat-value {
  display: block;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--color-white);
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--color-text-subtle);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

/* ---- Trust Bar ---- */
.trust-bar {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.trust-label {
  text-align: center;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  margin-bottom: 20px;
}

.trust-logos {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
}

.trust-logos span {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* ---- Sections ---- */
.section {
  padding: var(--section-padding) 0;
}

.section--dark {
  background: var(--color-bg-elevated);
}

.section--muted {
  background: var(--color-bg-muted);
}

.section-header {
  max-width: 640px;
  margin-bottom: 64px;
}

.section-header--center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.section-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---- Platform Grid ---- */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.platform-card {
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition), transform var(--transition);
}

.platform-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.platform-card--featured {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(110, 231, 196, 0.06) 0%, var(--color-bg-card) 60%);
  border-color: rgba(110, 231, 196, 0.15);
}

.platform-card--featured .platform-card-inner {
  max-width: 680px;
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.platform-card h3 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.platform-card p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* ---- Solutions ---- */
.solutions-list {
  max-width: 800px;
  margin: 0 auto;
}

.solution-item {
  display: flex;
  gap: 32px;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
}

.solution-item:first-child {
  padding-top: 0;
}

.solution-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.solution-num {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  padding-top: 4px;
}

.solution-content h3 {
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.solution-content p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---- Capabilities ---- */
.capabilities-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.capabilities-intro .section-desc {
  margin-bottom: 32px;
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.capability {
  padding: 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}

.capability:hover {
  border-color: var(--color-border-hover);
}

.capability h4 {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 8px;
}

.capability p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

/* ---- Process ---- */
.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  max-width: 960px;
  margin: 0 auto;
}

.process-step {
  flex: 1;
  text-align: center;
  padding: 0 16px;
}

.process-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  font-size: 16px;
  font-weight: 600;
  border-radius: 50%;
  margin-bottom: 20px;
  border: 1px solid rgba(110, 231, 196, 0.2);
}

.process-step h4 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.process-connector {
  width: 60px;
  height: 1px;
  background: var(--color-border);
  margin-top: 24px;
  flex-shrink: 0;
}

/* ---- Industries ---- */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.industry-card {
  padding: 36px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition);
}

.industry-card:hover {
  border-color: rgba(110, 231, 196, 0.2);
}

.industry-card h3 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 12px;
}

.industry-card > p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.industry-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.industry-card li {
  font-size: 13px;
  color: var(--color-text-subtle);
  padding-left: 16px;
  position: relative;
}

.industry-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ---- About ---- */
.about-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: center;
}

.about-text {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 36px;
  padding-top: 36px;
  border-top: 1px solid var(--color-border);
}

.value strong {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
}

.value span {
  font-size: 14px;
  color: var(--color-text-subtle);
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  max-width: 420px;
  margin: 0 auto;
}

.about-visual-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--color-border);
}

.visual-ring--1 {
  width: 100%;
  height: 100%;
  animation: pulse-ring 4s ease-in-out infinite;
}

.visual-ring--2 {
  width: 72%;
  height: 72%;
  border-color: rgba(110, 231, 196, 0.15);
  animation: pulse-ring 4s ease-in-out infinite 0.5s;
}

.visual-ring--3 {
  width: 44%;
  height: 44%;
  background: var(--color-accent-dim);
  border-color: rgba(110, 231, 196, 0.25);
}

.visual-label {
  position: relative;
  z-index: 1;
  font-family: var(--font-serif);
  font-size: 28px;
  font-style: italic;
  color: var(--color-accent);
}

@keyframes pulse-ring {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.02); }
}

/* ---- CTA / Contact ---- */
.cta-section {
  padding-bottom: var(--section-padding);
}

.cta-card {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  padding: 56px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  align-items: start;
}

.cta-content h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 14px;
  transition: border-color var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-subtle);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: rgba(110, 231, 196, 0.4);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-note {
  font-size: 12px;
  color: var(--color-text-subtle);
  text-align: center;
}

/* ---- Footer ---- */
.site-footer {
  padding: 64px 0 40px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 16px 0 24px;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-subtle);
}

.footer-links h4 {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-text-subtle);
  transition: color var(--transition);
}

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

/* ---- Reveal Animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger children */
.hero-content .reveal:nth-child(1) { transition-delay: 0.1s; }
.hero-content .reveal:nth-child(2) { transition-delay: 0.2s; }
.hero-content .reveal:nth-child(3) { transition-delay: 0.3s; }
.hero-content .reveal:nth-child(4) { transition-delay: 0.4s; }
.hero-content .reveal:nth-child(5) { transition-delay: 0.5s; }

/* ---- Form Success ---- */
.form-success {
  text-align: center;
  padding: 40px 20px;
}

.form-success h3 {
  font-size: 24px;
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.form-success p {
  font-size: 15px;
  color: var(--color-text-muted);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .capabilities-layout,
  .about-layout,
  .cta-card {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-visual {
    max-width: 320px;
  }

  .process-steps {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }

  .process-connector {
    width: 1px;
    height: 32px;
    margin: 0;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding: 32px 24px;
    gap: 24px;
    background: rgba(8, 9, 12, 0.98);
    backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 18px;
  }

  .platform-grid,
  .industries-grid,
  .capabilities-grid {
    grid-template-columns: 1fr;
  }

  .platform-card--featured {
    grid-column: span 1;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .stat-divider {
    display: none;
  }

  .solution-item {
    flex-direction: column;
    gap: 12px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .cta-card {
    padding: 32px 24px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

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