/* Near-monochrome base (true black/white, not tinted grays) with a single
   restrained blue accent, plus semantic green/red reserved exclusively for
   price direction -- everything else in the UI deliberately avoids color
   so gains/losses are the only thing that reads as colored at a glance. */
:root {
  --bg: #0b0d10;
  --bg-elevated: #15181c;
  --bg-sunken: #08090b;
  --border: #262b32;
  --border-soft: #1c2025;
  --text: #edeef0;
  --text-muted: #8b929c;
  --text-faint: #565d67;
  --accent: #5b9dff;
  --accent-hover: #7db0ff;
  --up: #26d07c;
  --down: #ff5c5c;
  --warn: #f5b942;
  --radius: 8px;
  --radius-sm: 5px;
  --header-height: 56px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-elevated: #f4f5f6;
  --bg-sunken: #ebedef;
  --border: #dcdfe3;
  --border-soft: #e8eaed;
  --text: #14161a;
  --text-muted: #61666e;
  --text-faint: #9298a1;
  --accent: #2f66c9;
  --accent-hover: #1f4fa8;
  --up: #157a45;
  --down: #c8392f;
  --warn: #a06a10;
  color-scheme: light;
}

* { box-sizing: border-box; }

::selection { background: rgba(91, 157, 255, 0.3); color: inherit; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
  transition: background-color 0.15s ease, color 0.15s ease;
}

h1, h2, h3 { font-weight: 700; letter-spacing: -0.01em; }

a { color: var(--accent); text-decoration: none; transition: color 0.12s ease; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

button { font-family: inherit; transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease; }

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code, .mono { font-family: var(--font-mono); }

.up { color: var(--up); }
.down { color: var(--down); }

/* ---------------------------------------------------------------- header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.brand-mark { flex-shrink: 0; }

.site-nav { display: flex; align-items: center; gap: 1.25rem; }
.site-nav > a { color: var(--text-muted); font-weight: 500; font-size: 0.9rem; }
.site-nav > a:hover { color: var(--text); text-decoration: none; }

.nav-account { display: flex; align-items: center; gap: 0.75rem; margin-left: 0.5rem; }
.nav-email { color: var(--text-muted); font-size: 0.85rem; }

.theme-toggle-btn, .logout-btn, .icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem 0.55rem;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.theme-toggle-btn:hover, .logout-btn:hover, .icon-btn:hover { color: var(--text); border-color: var(--text-faint); }
.theme-icon-light, :root[data-theme="light"] .theme-icon-dark { display: none; }
:root[data-theme="light"] .theme-icon-light { display: inline; }
.logout-form { margin: 0; }
.logout-label { display: none; }

/* ---------------------------------------------------------------- footer */
.site-footer {
  padding: 2rem 1.25rem;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------- flash / forms */
.flash {
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.flash-success { background: rgba(38, 208, 124, 0.12); color: var(--up); border: 1px solid rgba(38, 208, 124, 0.3); }
.flash-error { background: rgba(255, 92, 92, 0.12); color: var(--down); border: 1px solid rgba(255, 92, 92, 0.3); }

.form-errors {
  color: var(--down);
  font-size: 0.88rem;
  padding-left: 1.1rem;
  margin: 0 0 1rem;
}

.auth-page, .marketing-page {
  max-width: 420px;
  margin: 3rem auto;
  padding: 0 1.25rem;
}
.auth-page h1 { font-size: 1.5rem; margin-bottom: 1.25rem; }

.auth-form { display: flex; flex-direction: column; gap: 0.35rem; }
.auth-form label { font-size: 0.85rem; font-weight: 600; margin-top: 0.65rem; color: var(--text-muted); }
.auth-form input[type="email"],
.auth-form input[type="text"],
.auth-form input[type="password"] {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.6rem 0.7rem;
  font-size: 0.95rem;
}
.auth-form input:focus { border-color: var(--accent); }
.field-hint { font-size: 0.78rem; color: var(--text-faint); margin: 0.15rem 0 0; }

.auth-form button, .btn {
  margin-top: 1.1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-block;
  text-align: center;
}
.auth-form button:hover, .btn:hover { background: var(--accent-hover); text-decoration: none; }

.link-button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  padding: 0;
  font-size: 0.85rem;
  text-decoration: underline;
}
.inline-form { margin-top: 0.75rem; }

.auth-alt-link { font-size: 0.88rem; color: var(--text-muted); margin-top: 1rem; }

.error-page { max-width: 480px; margin: 4rem auto; text-align: center; padding: 0 1.25rem; }
.error-page h1 { font-size: 3rem; margin-bottom: 0.5rem; }

/* --------------------------------------------------------------- landing */
.landing { max-width: 980px; margin: 0 auto; padding: 4rem 1.5rem 5rem; }
.hero { max-width: 640px; margin-bottom: 3.5rem; }
.hero h1 { font-size: 2.75rem; line-height: 1.1; margin: 0 0 1rem; }
.hero-sub { color: var(--text-muted); font-size: 1.05rem; line-height: 1.6; }
.hero-actions { display: flex; gap: 0.75rem; margin-top: 1.5rem; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--text-faint); background: var(--bg-elevated); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}
.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.feature-card h3 { font-size: 1rem; margin: 0 0 0.5rem; }
.feature-card p { color: var(--text-muted); font-size: 0.9rem; margin: 0; line-height: 1.55; }

/* --------------------------------------------------------------- settings */
.settings-page { max-width: 640px; margin: 2.5rem auto; padding: 0 1.25rem; }
.settings-section { margin-bottom: 2.5rem; }
.settings-section h2 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.settings-hint { color: var(--text-muted); font-size: 0.88rem; line-height: 1.55; }
.settings-toggle { display: flex; align-items: center; gap: 0.5rem; font-size: 0.92rem; }

.key-cards { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 1rem; }
.key-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}
.key-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.5rem; }
.key-card-provider { font-weight: 700; text-transform: capitalize; }
.key-status { font-size: 0.78rem; padding: 0.15rem 0.5rem; border-radius: 999px; font-weight: 600; }
.key-status[data-status="ok"] { background: rgba(38, 208, 124, 0.15); color: var(--up); }
.key-status[data-status="invalid"], .key-status[data-status="none"] { background: rgba(255, 92, 92, 0.15); color: var(--down); }
.key-status[data-status="rate_limited"] { background: rgba(245, 185, 66, 0.15); color: var(--warn); }
.key-card input { width: 100%; background: var(--bg-sunken); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 0.5rem 0.65rem; font-family: var(--font-mono); font-size: 0.85rem; margin-bottom: 0.5rem; }
.key-card-actions { display: flex; gap: 0.5rem; }
.key-card-actions button { background: var(--bg-sunken); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius-sm); padding: 0.4rem 0.75rem; font-size: 0.82rem; cursor: pointer; }
.key-card-actions button:hover { border-color: var(--text-faint); }
.key-card-actions button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.key-card-actions button.primary:hover { background: var(--accent-hover); }
.key-card-actions button.danger:hover { border-color: var(--down); color: var(--down); }