/* ========================================
   CENT Shared Styles
   Common across all main-design pages
   ======================================== */

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Variables */
:root {
  --bg: #f8f7f4;
  --bg-card: #ffffff;
  --text: #1c1c1c;
  --text-secondary: #5c5c5c;
  --text-tertiary: #8a8a8a;
  --copper: #8b5a3c;
  --copper-light: #a67c5b;
  --border: #e5e3de;
  --border-light: #eeece7;
}

/* Body */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-blend-mode: overlay;
  background-size: 200px;
}

.serif {
  font-family: 'Source Serif 4', Georgia, serif;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   Header & Navigation
   ======================================== */

header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* Desktop nav */
nav {
  display: flex;
  gap: 36px;
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: #333;
}

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

.btn-secondary:hover {
  border-color: var(--text-secondary);
}

/* ========================================
   Mobile Navigation
   ======================================== */

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 100;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

.mobile-menu-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.open span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
  display: none;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  padding: 0 24px;
}

.mobile-nav.open {
  display: flex;
  flex-direction: column;
}

.mobile-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
  transition: color 0.2s;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

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

/* ========================================
   Footer
   ======================================== */

footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

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

.footer-legal {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  max-width: 400px;
  text-align: right;
  line-height: 1.6;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
  nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
  }

  .footer-legal {
    text-align: left;
    max-width: none;
  }
}