/* Camus Technologies — Corporate Landing Page
   Design system from Cherie Flutter app tokens */

/* ========== CSS Variables ========== */
:root {
  --primary-50: #F0F9F1;
  --primary-100: #DAF0DC;
  --primary-200: #B8E2BD;
  --primary-300: #8BCE94;
  --primary-400: #66B872;
  --primary: #4CAF50;
  --primary-600: #3D8B40;
  --primary-700: #326D34;
  --primary-800: #2A572C;
  --primary-900: #244826;

  --secondary-50: #FFF7ED;
  --secondary: #FF9800;

  --accent: #5EB8D0;

  --bg: #FAFAFA;
  --bg-warm: #FFFBF5;
  --bg-surface: #FFFFFF;

  --text: #1F2937;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;

  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-800: #1F2937;

  --border: #E5E7EB;

  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 40px;
  --space-xxxl: 48px;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;

  --max-width: 1040px;
  --nav-height: 64px;
}

/* ========== Reset ========== */
*, *::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: 'Poppins', 'Noto Sans TC', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

a { color: var(--primary-700); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ========== Utility ========== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--space-md);
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.nav-brand:hover { text-decoration: none; }
.nav-brand img { height: 28px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language Switcher */
.lang-switch {
  position: relative;
  font-size: 13px;
}
.lang-switch select {
  appearance: none;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 24px 4px 8px;
  font-size: 13px;
  font-family: 'Poppins', 'Noto Sans TC', sans-serif;
  cursor: pointer;
  outline: none;
}
.lang-switch select:hover { border-color: var(--primary-200); }
.lang-switch::after {
  content: '\25BE';
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  pointer-events: none;
  font-size: 11px;
}

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

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0; bottom: 0;
  background: rgba(250, 250, 250, 0.98);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 99;
  padding: var(--space-xl) var(--space-lg);
  flex-direction: column;
  gap: var(--space-lg);
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
}
.mobile-nav a:hover { text-decoration: none; color: var(--primary); }

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: 'Poppins', 'Noto Sans TC', sans-serif;
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-600);
  color: #fff;
  box-shadow: 0 4px 16px rgba(76, 175, 80, 0.25);
}

.btn-sm { padding: 8px 20px; font-size: 13px; }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-md); }

/* ========== Hero ========== */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(to bottom right, #F0F9F1, #FFF7ED);
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.hero-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1.5px;
  color: var(--text);
  margin-bottom: var(--space-lg);
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-xxxl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.stat { text-align: center; }
.stat-value {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}
.stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-light);
  margin-top: 2px;
}

.stat-divider {
  width: 1px;
  background: var(--border);
  align-self: stretch;
}

/* ========== Sections ========== */
.section {
  padding: 100px 0;
}

.section-header {
  margin-bottom: 56px;
}
.section-header h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}

/* ========== Mission ========== */
.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.mission-block h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: var(--space-lg);
}

.mission-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.vision-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.vision-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.vision-card:hover {
  border-color: var(--primary-200);
  box-shadow: 0 4px 20px rgba(76, 175, 80, 0.08);
}

.vision-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-50);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.vision-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-xxs);
  color: var(--text);
}

.vision-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== Products ========== */
.products-section {
  background: var(--gray-50);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.product-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.product-card:hover {
  border-color: var(--primary-200);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.product-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.product-logo {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.product-logo-placeholder {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.product-header h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}

.product-type {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
}

.product-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--gray-100);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--primary-700);
}
.product-link:hover { text-decoration: none; color: var(--primary); }

/* ========== About ========== */
.about-section {
  border-top: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-main h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: var(--space-xxs);
}

.about-zhname {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.about-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface);
}

.detail-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
}
.detail-item:last-child { border-bottom: none; }

.detail-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
}

.detail-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  text-align: right;
}

/* ========== Contact ========== */
.contact-section {
  background: var(--primary-50);
}

.contact-inner {
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.contact-inner h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-md);
}

.contact-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

/* ========== Footer ========== */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
  padding: var(--space-xxxl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xxxl);
  margin-bottom: var(--space-xxl);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-sm);
}
.footer-brand img { height: 22px; width: auto; }

.footer-desc {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.7;
  max-width: 260px;
}

.footer h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-md);
}

.footer a {
  color: var(--text-light);
  font-size: 14px;
  transition: color 0.2s;
}
.footer a:hover { color: var(--primary); text-decoration: none; }

.footer ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 13px;
  color: var(--text-light);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .mission-grid { grid-template-columns: 1fr; gap: var(--space-xxl); }
  .about-grid { grid-template-columns: 1fr; gap: var(--space-xxl); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-actions .btn { display: none; }

  .hero { padding: 120px 0 72px; }
  .hero h1 { font-size: 32px; letter-spacing: -0.5px; }
  .hero .subtitle { font-size: 16px; }

  .section { padding: 64px 0; }

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

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

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
  }
  .stat-divider { width: 40px; height: 1px; }

  .detail-item {
    flex-direction: column;
    gap: var(--space-xxs);
  }
  .detail-value { text-align: left; }
}