/* ============================================
   Chad & Liu — Shared Stylesheet
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

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

:root {
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --section-break: #F0F2F5;
  --text: #1C2333;
  --text-muted: #6B7280;
  --accent: #4A6FA5;
  --accent-hover: #3A5A8A;
  --border: #E5E7EB;
  --nav-height: 68px;
  --max-width: 1120px;
  --radius: 8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

/* ---- Typography ---- */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 600;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

p {
  color: var(--text-muted);
  max-width: 65ch;
}

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 96px 0;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.15s ease, box-shadow 0.25s ease;
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(74, 111, 165, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}

.btn-white {
  background: #fff;
  color: var(--accent);
}

.btn-white:hover {
  background: #f0f4fb;
  transform: translateY(-1px);
}

/* ---- Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.nav.scrolled {
  border-color: var(--border);
  box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}

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

.nav-logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

.nav-links a.active {
  font-weight: 500;
}

.nav-cta {
  font-weight: 500 !important;
  color: var(--accent) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Footer ---- */
.footer {
  background: var(--text);
  color: rgba(255,255,255,0.6);
  padding: 56px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.5rem;
}

.footer-tagline {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  max-width: none;
}

.footer-links {
  display: flex;
  gap: 1.75rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 32px;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.35);
}

/* ---- Dot-grid texture ---- */
.texture {
  background-image: radial-gradient(circle, rgba(74,111,165,0.12) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* ---- Scroll fade-in ---- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in.delay-1 { transition-delay: 0.1s; }
.fade-in.delay-2 { transition-delay: 0.2s; }
.fade-in.delay-3 { transition-delay: 0.3s; }
.fade-in.delay-4 { transition-delay: 0.4s; }

/* ---- Section labels ---- */
.label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* ---- Divider ---- */
.divider {
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 1.25rem 0 1.75rem;
}

/* ============================================
   HOME PAGE
   ============================================ */

/* Hero */
.hero {
  padding: 100px 0 96px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(74,111,165,0.1) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 760px;
}

.hero h1 {
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  font-size: 1.125rem;
  margin-bottom: 2.5rem;
  max-width: 55ch;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Features strip */
.features {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
}

.features-header {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 56px;
}

.features-header p {
  max-width: none;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.feature-card {
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.feature-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-3px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.feature-card h3 {
  margin-bottom: 0.625rem;
}

.feature-card p {
  font-size: 0.9375rem;
}

/* Differentiator */
.differentiator {
  background: var(--section-break);
}

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.diff-content h2 {
  margin-bottom: 1.25rem;
}

.diff-content p {
  margin-bottom: 1.5rem;
}

.diff-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.stat {
  padding: 1.5rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.stat-number {
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.375rem;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* CTA Banner */
.cta-banner {
  background: var(--accent);
  padding: 80px 0;
}

.cta-banner-inner {
  text-align: center;
}

.cta-banner h2 {
  color: #fff;
  margin-bottom: 1rem;
}

.cta-banner p {
  color: rgba(255,255,255,0.75);
  max-width: 50ch;
  margin: 0 auto 2rem;
}

/* ============================================
   SERVICES PAGE
   ============================================ */

.page-hero {
  padding: 80px 0 72px;
  background: var(--section-break);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  margin-bottom: 1rem;
}

.page-hero p {
  font-size: 1.125rem;
  max-width: 55ch;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.service-card {
  padding: 2.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow 0.25s ease;
}

.service-card:hover {
  box-shadow: 0 6px 24px rgba(0,0,0,0.07);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.875rem;
}

.service-card p {
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ============================================
   ABOUT PAGE
   ============================================ */

.about-intro {
  background: var(--section-break);
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-intro-content h2 {
  margin-bottom: 1.25rem;
}

.about-intro-content p {
  margin-bottom: 1.25rem;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.value-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.value-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 0.55rem;
  flex-shrink: 0;
}

.value-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.value-item p {
  font-size: 0.9rem;
}

.team-section {
  background: var(--surface);
}

.team-section h2 {
  text-align: center;
  margin-bottom: 0.75rem;
}

.team-section > .container > p {
  text-align: center;
  margin: 0 auto 3.5rem;
}

.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.bio-card {
  padding: 2.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.bio-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--section-break);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
}

.bio-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.bio-title {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1rem;
}

.bio-card p {
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ============================================
   CONTACT PAGE
   ============================================ */

.contact-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 6rem;
  align-items: start;
}

.contact-info h2 {
  margin-bottom: 1rem;
}

.contact-info p {
  margin-bottom: 2rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-detail {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
}

.contact-detail-icon {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.contact-detail-text strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.contact-detail-text span {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.contact-form-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  outline: none;
  -webkit-appearance: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,111,165,0.12);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #E55353;
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.6;
}

.form-error {
  display: none;
  font-size: 0.8125rem;
  color: #E55353;
  margin-top: 0.375rem;
}

.form-error.visible {
  display: block;
}

.form-success {
  display: none;
  padding: 1rem 1.25rem;
  background: #EDF7ED;
  border: 1px solid #B7DFB8;
  border-radius: var(--radius);
  color: #2E7D32;
  font-size: 0.9375rem;
  font-weight: 500;
  margin-top: 1.25rem;
}

.form-success.visible {
  display: block;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  section { padding: 64px 0; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1.25rem;
  }

  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .features-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .diff-grid { grid-template-columns: 1fr; gap: 3rem; }
  .diff-stats { grid-template-columns: 1fr 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .about-intro-grid { grid-template-columns: 1fr; gap: 3rem; }
  .team-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; gap: 1.25rem; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}