*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0b0b0e;
  --surface:   #141418;
  --surface2:  #1c1c22;
  --surface3:  #24242c;
  --border:    #2a2a34;
  --text:      #e8e8f0;
  --muted:     #7a7a8c;
  --accent:    #ffb454;
  --green:     #4ade80;
  --green-dim: #166534;
  --blue:      #60a5fa;
  --blue-dim:  #1e3a5f;
  --purple:    #a78bfa;
  --purple-dim:#3b2a6e;
  --yellow:    #fbbf24;
  --yellow-dim:#713f12;
  --red:       #f87171;
  --red-dim:   #7f1d1d;
  --r:         10px;
}

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── Header ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
  background: rgba(11,11,14,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: .5rem; text-decoration: none; color: var(--text); font-weight: 600; }
.brand-mark { display: flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 6px; background: var(--accent); color: #000; font-family: ui-serif, Georgia, serif; font-size: 15px; font-weight: 700; }
.brand-name { font-size: 14px; letter-spacing: -.01em; }
.back { color: var(--muted); text-decoration: none; font-size: 13px; transition: color .15s; }
.back:hover { color: var(--text); }