/* ─── TCM Design Tokens — SpaceX meets Traditional Chinese Medicine ── */
:root {
  /* ── Core backgrounds (SpaceX dark) ── */
  --bg-primary:       #080808;
  --bg-secondary:     #0e0e0e;
  --bg-tertiary:      #141414;
  --bg-card:          rgba(255, 255, 255, 0.04);
  --bg-card-hover:    rgba(255, 255, 255, 0.07);
  --glass-border:     rgba(255, 255, 255, 0.10);
  --glass-border-hover: rgba(201, 168, 76, 0.30);

  /* ── Text ── */
  --text-primary:     #ffffff;
  --text-secondary:   #ffffff;
  --text-tertiary:    #5a5248;

  /* ── TCM Accent palette ── */
  --accent-gold:        #C9A84C;
  --accent-gold-hover:  #DEB96A;
  --accent-gold-dim:    rgba(201, 168, 76, 0.15);
  --accent-jade:        #2D8653;
  --accent-jade-hover:  #3AA065;
  --accent-jade-dim:    rgba(45, 134, 83, 0.15);
  --accent-vermillion:  #C0392B;
  --accent-vermillion-dim: rgba(192, 57, 43, 0.15);
  --accent-sky:         #4A90C4;
  --accent-sky-dim:     rgba(74, 144, 196, 0.15);

  /* ── Gradients ── */
  --gradient-hero:    linear-gradient(135deg, #1a0a00 0%, #0e1a0a 50%, #000810 100%);
  --gradient-gold:    linear-gradient(135deg, #C9A84C, #8B6914);
  --gradient-card:    linear-gradient(145deg, rgba(201,168,76,0.06), rgba(255,255,255,0.02));

  /* ── Typography ── */
  --font-system:  -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang TC",
                  "Noto Serif TC", "Microsoft JhengHei", serif;
  --font-mono:    "SF Mono", "Monaco", "Inconsolata", monospace;

  /* ── Spacing ── */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   40px;
  --space-2xl:  64px;
  --space-3xl:  96px;

  /* ── Radius ── */
  --radius-sm:   6px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-sm:        0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md:        0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg:        0 20px 60px rgba(0, 0, 0, 0.6);
  --shadow-glow-gold: 0 0 30px rgba(201, 168, 76, 0.20);
  --shadow-glow-jade: 0 0 30px rgba(45, 134, 83, 0.20);

  /* ── Transitions ── */
  --transition-fast:   0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow:   0.4s cubic-bezier(0.4, 0, 0.2, 1);

  /* ── Layout ── */
  --max-width:  1200px;
  --nav-height: 64px;
}

/* ─── Reset ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
  font-family: var(--font-system);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Typography ──────────────────────────────────── */
h1, h2, h3, h4, h5, h6 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }
p  { color: var(--text-secondary); line-height: 1.7; }
a  { color: var(--accent-gold); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-gold-hover); }

/* ─── Layout ──────────────────────────────────────── */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-lg); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.text-center { text-align: center; }
.text-secondary { color: var(--text-secondary); }
.hidden { display: none !important; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .container { padding: 0 var(--space-md); }
}
@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* ─── Navbar ──────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(8, 8, 8, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000; display: flex; align-items: center;
}
@media (max-width: 768px) {
  .navbar { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(8,8,8,0.97); }
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav-logo { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; }
.nav-links { display: flex; align-items: center; gap: var(--space-lg); list-style: none; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; transition: color var(--transition-fast); }
.nav-links a:hover { color: var(--accent-gold); }
.nav-actions { display: flex; gap: var(--space-sm); align-items: center; }
.nav-hamburger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 36px; height: 36px; cursor: pointer; background: none; border: none;
  padding: 4px; margin-left: var(--space-sm);
}
.nav-hamburger span { display: block; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all 0.25s ease; }

@media (max-width: 768px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: #080808; border-bottom: 1px solid var(--glass-border);
    padding: var(--space-md) 0; z-index: 999;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: var(--space-md) var(--space-lg); font-size: 1rem; color: var(--text-primary); }
  .page-content { padding-top: calc(var(--nav-height) + var(--space-lg)); }
  .container { padding: 0 var(--space-md); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .toast-container { left: var(--space-md); right: var(--space-md); bottom: var(--space-md); }
  .toast { min-width: unset; max-width: 100%; }
}

.page-content { padding-top: calc(var(--nav-height) + var(--space-xl)); }
.section { padding: var(--space-3xl) 0; }

/* ─── Loading ─────────────────────────────────────── */
.loading-spinner {
  width: 32px; height: 32px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent-gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999; backdrop-filter: blur(4px);
}
@media (max-width: 768px) {
  .loading-overlay { backdrop-filter: none; background: rgba(0,0,0,0.88); }
}

/* ─── Toast ───────────────────────────────────────── */
.toast-container {
  position: fixed; bottom: var(--space-lg); right: var(--space-lg);
  z-index: 10000; display: flex; flex-direction: column; gap: var(--space-sm);
}
.toast {
  background: var(--bg-card); border: 1px solid var(--glass-border);
  border-radius: var(--radius-md); padding: var(--space-md) var(--space-lg);
  backdrop-filter: blur(20px); min-width: 240px; max-width: 380px;
  font-size: 0.9rem; animation: slideInRight 0.3s ease;
}
.toast.success { border-left: 3px solid var(--accent-jade); }
.toast.error   { border-left: 3px solid var(--accent-vermillion); }
.toast.info    { border-left: 3px solid var(--accent-gold); }
@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ─── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(201,168,76,0.2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(201,168,76,0.35); }