:root {
  color-scheme: light;
  --bg: #f4efe6;
  --bg-elev: #fffdf8;
  --ink: #1c1915;
  --muted: #5c564c;
  --line: #d9d0c1;
  --accent: #0f5c4c;
  --accent-soft: #d8ebe4;
  --warn: #8a3b12;
  --input-bg: #ffffff;
  --shadow: 0 12px 40px rgba(28, 25, 21, 0.08);
  --glow-a: #e7efe9;
  --glow-b: #efe6d4;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1a1a1a;
  --bg-elev: #262626;
  --ink: #ececec;
  --muted: #a3a3a3;
  --line: #3d3d3d;
  --accent: #6ecfba;
  --accent-soft: #243532;
  --warn: #e0a06a;
  --input-bg: #141414;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  --glow-a: #222222;
  --glow-b: #1f1f1f;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--glow-a) 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, var(--glow-b) 0%, transparent 50%),
    var(--bg);
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 100vh;
  line-height: 1.5;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap {
  width: min(960px, calc(100% - 2.5rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0 0.5rem;
}

.brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--accent); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  font-size: 0.92rem;
}
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--accent); }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--mono);
}

.btn {
  appearance: none;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--bg-elev);
  border-radius: 999px;
  padding: 0.65rem 1.1rem;
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.secondary {
  background: transparent;
  color: var(--ink);
}
.btn.secondary:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.hero {
  padding: 2.5rem 0 1.5rem;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0.4rem 0 1rem;
  max-width: 16ch;
}
.lede {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 42rem;
  margin: 0 0 1.5rem;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 1.5rem 0 2.5rem;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.15rem 1.2rem;
  box-shadow: var(--shadow);
}
.card h2, .card h3 {
  font-family: var(--serif);
  font-weight: 500;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}
.card p, .card li { color: var(--muted); }
.card ul { margin: 0.4rem 0 0; padding-left: 1.1rem; }

.section-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 2rem 0 0.75rem;
}

.gate-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}
.gate-card {
  width: min(420px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
}
.gate-card h1 {
  font-family: var(--serif);
  font-size: 1.8rem;
  font-weight: 500;
  margin: 0.2rem 0 0.5rem;
}
.gate-card p { color: var(--muted); margin: 0 0 1.2rem; }
.gate-card label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.gate-card input[type="password"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  font: inherit;
  background: var(--input-bg);
  color: var(--ink);
  margin-bottom: 0.9rem;
}
.err {
  color: var(--warn);
  font-size: 0.88rem;
  min-height: 1.2em;
  margin: 0 0 0.6rem;
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}
textarea, .ask-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
  font: inherit;
  background: var(--input-bg);
  color: var(--ink);
  resize: vertical;
  min-height: 6rem;
}
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.tab {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
}
.tab.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.sources {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.75rem;
}
.muted { color: var(--muted); }
.footer {
  padding: 2.5rem 0 3rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.hidden { display: none !important; }


.theme-toggle {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
  color: var(--muted);
  line-height: 0;
}
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 999px;
}
.theme-toggle__icon {
  display: inline-flex;
  opacity: 0.7;
  transition: opacity 0.2s ease, color 0.2s ease;
}
.theme-toggle__icon svg { display: block; }
.theme-toggle__track {
  position: relative;
  width: 2.75rem;
  height: 1.35rem;
  border-radius: 999px;
  background: var(--bg);
  box-shadow:
    inset 2px 2px 4px rgba(0, 0, 0, 0.12),
    inset -2px -2px 4px rgba(255, 255, 255, 0.7);
}
html[data-theme="dark"] .theme-toggle__track {
  box-shadow:
    inset 2px 2px 5px rgba(0, 0, 0, 0.55),
    inset -1px -1px 3px rgba(255, 255, 255, 0.04);
}
.theme-toggle__thumb {
  position: absolute;
  top: 0.18rem;
  left: 0.18rem;
  width: 0.98rem;
  height: 0.98rem;
  border-radius: 50%;
  background: var(--bg-elev);
  box-shadow:
    2px 2px 5px rgba(0, 0, 0, 0.18),
    -1px -1px 3px rgba(255, 255, 255, 0.85);
  transition: transform 0.22s ease;
}
html[data-theme="dark"] .theme-toggle__thumb {
  transform: translateX(1.4rem);
  background: #323232;
  box-shadow:
    2px 2px 6px rgba(0, 0, 0, 0.55),
    -1px -1px 2px rgba(255, 255, 255, 0.05);
}
html[data-theme="light"] .theme-toggle__icon--sun,
html:not([data-theme]) .theme-toggle__icon--sun {
  color: var(--ink);
  opacity: 1;
}
html[data-theme="dark"] .theme-toggle__icon--moon {
  color: var(--ink);
  opacity: 1;
}
.gate-theme {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 5;
  padding: 0.45rem 0.55rem;
  border-radius: 999px;
  background: var(--bg);
}