/* ============================================
   NotAI.work — 不使用AI绘画宣言
   Warm, human, manifesto-appropriate aesthetic
   ============================================ */

:root {
  --color-cream: #faf6f1;
  --color-paper: #f5efe6;
  --color-ink: #2c2419;
  --color-ink-light: #4a4238;
  --color-terracotta: #b85c38;
  --color-terracotta-muted: #c97b5c;
  --color-warm-gray: #8b7e6b;
  --color-border: #e5ddd2;
  --font-serif: "Noto Serif SC", "Source Han Serif CN", serif;
  --font-display: "Cormorant Garamond", "Noto Serif SC", serif;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-cream);
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(184, 92, 56, 0.06), transparent),
    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='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
}

.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 1.5rem;
  background: rgba(250, 246, 241, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--color-terracotta);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-ink-light);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition);
}

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

.lang-switcher {
  display: flex;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.lang-switcher button {
  background: none;
  border: none;
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  color: var(--color-ink-light);
  cursor: pointer;
  transition: color var(--transition);
}

.lang-switcher button:hover {
  color: var(--color-terracotta);
}

.lang-switcher button.active {
  color: var(--color-ink);
  font-weight: 600;
}

/* Hero */
.hero {
  min-height: 40vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 5.25rem 1.5rem 2.5rem;
  position: relative;
}

.hero-content {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-subtitle {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--color-warm-gray);
  margin: 0 0 0.5rem;
  letter-spacing: 0.15em;
  text-transform: lowercase;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  color: var(--color-ink);
  margin: 0 0 1rem;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-warm-gray);
  margin: 0 auto 1.25rem;
  max-width: 520px;
  width: 100%;
  text-align: center;
}

@media (min-width: 1100px) {
  .hero-content {
    max-width: 1100px;
    padding: 0 1rem;
  }

  .hero-title,
  .hero-tagline {
    white-space: nowrap;
  }

  .hero-title {
    line-height: 1.2;
  }

  .hero-tagline {
    max-width: none;
    width: auto;
  }
}

.cta-primary {
  display: inline-block;
  padding: 0.85rem 2rem;
  background: var(--color-ink);
  color: var(--color-cream) !important;
  text-decoration: none;
  font-size: 0.95rem;
  border-radius: 2px;
  transition: background var(--transition), transform var(--transition);
}

.cta-primary:hover {
  background: var(--color-terracotta);
  transform: translateY(-1px);
}

.hero-ornament {
  position: absolute;
  bottom: 2rem;
  font-size: 1rem;
  color: var(--color-border);
  opacity: 0.7;
}

/* Manifesto Section */
.manifesto-section {
  padding: 2.25rem 0;
  background: var(--color-paper);
  border-top: 1px solid var(--color-border);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-warm-gray);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin: 0 0 2rem;
}

.manifesto-content {
  padding-left: 1rem;
  border-left: 2px solid var(--color-terracotta-muted);
}

.manifesto-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-style: italic;
  line-height: 1.8;
  color: var(--color-ink);
  margin: 0 0 2rem;
}

.manifesto-points {
  list-style: none;
  padding: 0;
  margin: 0;
}

.manifesto-points li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
}

.manifesto-points li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-terracotta-muted);
  font-weight: 600;
}

/* Join Section */
.join-section {
  padding: 2.25rem 0;
  background: var(--color-paper);
  border-top: 1px solid var(--color-border);
}

.join-intro {
  margin: 0 0 1.5rem;
  color: var(--color-ink-light);
}

.join-box {
  padding: 2rem;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.join-text {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-ink);
}

.join-qr-link {
  display: block;
  margin: 0 auto 1.25rem;
  line-height: 0;
}

.join-qr {
  display: block;
  width: 200px;
  height: auto;
  border-radius: 4px;
  transition: opacity var(--transition);
}

.join-qr-link:hover .join-qr {
  opacity: 0.9;
}

.cta-secondary {
  display: inline-block;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  color: var(--color-terracotta);
  text-decoration: none;
  font-size: 0.95rem;
  border: 1px solid var(--color-terracotta-muted);
  border-radius: 2px;
  transition: background var(--transition), color var(--transition);
}

.cta-secondary:hover {
  background: var(--color-terracotta);
  color: white !important;
}

/* Footer */
.footer {
  padding: 2.5rem 0;
  background: var(--color-ink);
  color: var(--color-cream);
  text-align: center;
}

.footer p {
  margin: 0.25rem 0;
  font-size: 0.95rem;
}

.footer-small {
  font-size: 0.85rem !important;
  opacity: 0.8;
}

/* Responsive */
@media (max-width: 600px) {
  .nav-links {
    gap: 1.25rem;
  }
  
  .hero {
    min-height: 0;
    padding: 4.75rem 1rem 2rem;
  }
  
  .manifesto-text {
    font-size: 1.15rem;
  }
}