/* Peptide Research Vault core design system.
   Moody, high-end: near-black grounds, emerald and gold-green accents, serif type.
   Evidence-strength colour coding stays functional but sits within the dark palette. */

:root {
  --bg: #0a0e0c;
  --bg-deep: #050807;
  --surface: #10160f;
  --surface-2: #161e15;
  --surface-3: #1c261a;
  --ink: #eef1e9;
  --ink-soft: #c3ccbd;
  --muted: #8a978a;
  --border: #232d20;
  --border-strong: #34412f;

  --accent: #2f8f5b;
  --accent-bright: #4fd18b;
  --accent-deep: #14603a;
  --accent-soft: #0f2018;
  --gold: #c7d59a;

  --verified: #5fd18b;
  --verified-soft: #0f2417;
  --trial: #cfe08a;
  --trial-soft: #1a2410;
  --danger: #e9738a;
  --danger-soft: #2a1218;
  --unverified: #8a978a;
  --unverified-soft: #161d15;

  --radius: 4px;
  --radius-lg: 8px;
  --shadow: 0 2px 30px rgba(0, 0, 0, 0.45);
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-body: "EB Garamond", Georgia, "Times New Roman", serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --container: 1180px;
}

/* Single dark theme. A lighter mode is offered but the brand lives in the dark. */
:root[data-theme="light"] {
  --bg: #f3f2ec;
  --bg-deep: #e9e8df;
  --surface: #ffffff;
  --surface-2: #f6f5ef;
  --surface-3: #eeece3;
  --ink: #10160f;
  --ink-soft: #34412f;
  --muted: #5c6a58;
  --border: #dcdccf;
  --border-strong: #c2c3b2;
  --accent: #1c6b41;
  --accent-bright: #14603a;
  --accent-deep: #0d3f26;
  --accent-soft: #e4efe6;
  --gold: #6f7a45;
  --verified: #1c6b41;
  --verified-soft: #e2efe6;
  --trial: #4d6a1f;
  --trial-soft: #eef2dc;
  --danger: #9a2942;
  --danger-soft: #f6e3e7;
  --unverified: #5c6a58;
  --unverified-soft: #eceadf;
  --shadow: 0 1px 3px rgba(16, 22, 15, 0.08), 0 1px 20px rgba(16, 22, 15, 0.05);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  background-image: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(47, 143, 91, 0.10), transparent 70%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  font-size: 19px;
  letter-spacing: 0.005em;
}
img { max-width: 100%; display: block; }
a { color: var(--accent-bright); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--gold); text-decoration: none; }
code, .mono { font-family: var(--font-mono); font-size: 0.82em; letter-spacing: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h1 { font-weight: 900; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(10, 14, 12, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
:root[data-theme="light"] .site-header { background: rgba(243, 242, 236, 0.85); }
.site-header .bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; gap: 18px; max-width: var(--container); margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 13px; color: var(--ink); }
.brand .mark {
  width: 40px; height: 40px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--accent-bright), var(--accent-deep) 75%);
  border: 1px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  color: var(--bg-deep); font-family: var(--font-display); font-weight: 900; font-size: 0.9rem;
  box-shadow: 0 0 24px rgba(79, 209, 139, 0.22);
}
.brand .brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; letter-spacing: 0.01em; }
.brand small { display: block; font-family: var(--font-body); font-weight: 400; color: var(--muted); font-size: 0.78rem; letter-spacing: 0.04em; font-style: italic; }
.main-nav { display: flex; gap: 2px; align-items: center; flex-wrap: wrap; }
.main-nav a {
  color: var(--ink-soft); font-family: var(--font-body); font-size: 1.02rem; font-weight: 500;
  padding: 8px 16px; border-radius: var(--radius); letter-spacing: 0.02em;
}
.main-nav a:hover { color: var(--ink); background: var(--surface-2); }
.main-nav a.active { color: var(--accent-bright); }
.nav-toggle { display: none; }

@media (max-width: 900px) {
  .main-nav { display: none; width: 100%; order: 3; flex-direction: column; align-items: stretch; }
  .main-nav.open { display: flex; }
  .nav-toggle { display: inline-flex; }
  .site-header .bar { flex-wrap: wrap; }
}

/* Disclaimer banner */
.disclaimer-banner {
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}
.disclaimer-banner .container { padding: 9px 24px; display: flex; gap: 8px; align-items: center; }
.disclaimer-banner strong { color: var(--ink-soft); font-weight: 600; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: var(--radius); font-family: var(--font-body);
  font-weight: 600; font-size: 1.02rem; letter-spacing: 0.03em;
  border: 1px solid transparent; cursor: pointer;
  background: var(--accent); color: var(--bg-deep);
  transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { background: var(--accent-bright); color: var(--bg-deep); box-shadow: 0 0 30px rgba(79, 209, 139, 0.28); }
.btn.secondary { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn.secondary:hover { background: var(--surface-2); color: var(--ink); border-color: var(--accent); box-shadow: none; }
.btn.block { width: 100%; }

/* Sections */
.section { padding: 76px 0; }
.section.tight { padding: 44px 0; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow);
}
.card-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.eyebrow {
  text-transform: uppercase; letter-spacing: 0.28em; font-size: 0.7rem; font-weight: 600;
  color: var(--accent-bright); font-family: var(--font-body);
}
.lede { color: var(--ink-soft); font-size: 1.22rem; max-width: 60ch; line-height: 1.55; }
.muted { color: var(--muted); }

/* Tool tiles */
.tool-tile { display: flex; flex-direction: column; gap: 12px; height: 100%; position: relative; overflow: hidden; }
.tool-tile::after {
  content: ""; position: absolute; inset: 0; border-radius: var(--radius-lg);
  border: 1px solid transparent; pointer-events: none; transition: border-color 0.2s ease;
}
.tool-tile:hover::after { border-color: var(--accent); }
.tool-tile .icon { font-size: 1.7rem; opacity: 0.9; }
.tool-tile h3 { margin: 0; font-size: 1.3rem; }
.tool-tile p { margin: 0; color: var(--muted); font-size: 1rem; flex: 1; line-height: 1.5; }
.tool-tile .go { font-family: var(--font-body); font-weight: 600; font-size: 0.92rem; color: var(--accent-bright); letter-spacing: 0.03em; }

/* Badges (evidence strength) */
.badge {
  display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-body);
  font-size: 0.74rem; font-weight: 600; padding: 4px 11px; border-radius: 999px;
  white-space: nowrap; letter-spacing: 0.05em; text-transform: uppercase;
  border: 1px solid transparent;
}
.badge.verified { background: var(--verified-soft); color: var(--verified); border-color: rgba(95, 209, 139, 0.25); }
.badge.trial { background: var(--trial-soft); color: var(--trial); border-color: rgba(217, 201, 143, 0.25); }
.badge.warning { background: var(--trial-soft); color: var(--trial); border-color: rgba(217, 201, 143, 0.25); }
.badge.danger { background: var(--danger-soft); color: var(--danger); border-color: rgba(233, 115, 138, 0.28); }
.badge.unverified { background: var(--unverified-soft); color: var(--unverified); border-color: var(--border-strong); }

/* Forms */
label { display: block; font-family: var(--font-body); font-weight: 600; font-size: 0.88rem; margin-bottom: 7px; color: var(--ink-soft); letter-spacing: 0.02em; }
input, select, textarea {
  width: 100%; padding: 12px 14px; border-radius: var(--radius);
  border: 1px solid var(--border-strong); background: var(--bg-deep); color: var(--ink);
  font-size: 1rem; font-family: var(--font-body);
}
:root[data-theme="light"] input, :root[data-theme="light"] select, :root[data-theme="light"] textarea { background: var(--surface); }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.field { margin-bottom: 18px; }
.field-row { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.hint { font-size: 0.86rem; color: var(--muted); margin-top: 5px; font-style: italic; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 1rem; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-family: var(--font-body); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 600; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); }
.table-wrap table { margin: 0; }

/* Alerts */
.alert {
  padding: 16px 18px; border-radius: var(--radius); border: 1px solid var(--border);
  font-size: 0.98rem; line-height: 1.5;
}
.alert.warn { background: var(--trial-soft); border-color: rgba(217, 201, 143, 0.2); color: var(--trial); }
.alert.danger { background: var(--danger-soft); border-color: rgba(233, 115, 138, 0.22); color: var(--danger); }
.alert.info { background: var(--accent-soft); border-color: rgba(79, 209, 139, 0.2); color: var(--accent-bright); }

/* Result panel (calculators) */
.result-panel {
  background: var(--bg-deep); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 24px;
}
.result-stat { display: flex; justify-content: space-between; align-items: baseline; padding: 11px 0; border-bottom: 1px solid var(--border); font-size: 1rem; }
.result-stat:last-child { border-bottom: none; }
.result-stat .value { font-family: var(--font-mono); font-weight: 400; color: var(--accent-bright); font-size: 1.05rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-deep); margin-top: 80px; }
.site-footer .container { padding: 52px 24px; display: grid; gap: 32px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.site-footer h4 { font-family: var(--font-body); font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--muted); margin: 0 0 14px; font-weight: 600; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.site-footer a { color: var(--ink-soft); font-size: 1rem; }
.site-footer a:hover { color: var(--accent-bright); }
.footer-bottom {
  border-top: 1px solid var(--border); padding: 22px 24px; font-size: 0.86rem; color: var(--muted);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; max-width: var(--container); margin: 0 auto;
}

/* Hero */
.hero { padding: 96px 0 56px; }
.hero h1 { font-size: clamp(2.6rem, 5.5vw, 4.4rem); margin: 20px 0 22px; max-width: 16ch; line-height: 1.04; }
.hero .lede { font-size: 1.32rem; }
.hero-actions { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.stat-strip { display: flex; gap: 44px; flex-wrap: wrap; margin-top: 52px; padding-top: 34px; border-top: 1px solid var(--border); }
.stat-strip .stat b { display: block; font-family: var(--font-display); font-size: 2.4rem; font-weight: 700; color: var(--ink); line-height: 1; }
.stat-strip .stat span { color: var(--muted); font-size: 0.9rem; letter-spacing: 0.03em; margin-top: 6px; display: block; }

/* Search / filters (codex) */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 26px; }
.chip {
  border: 1px solid var(--border-strong); background: transparent; color: var(--ink-soft);
  padding: 7px 16px; border-radius: 999px; font-family: var(--font-body); font-size: 0.9rem;
  font-weight: 500; cursor: pointer; letter-spacing: 0.02em; transition: all 0.15s ease;
}
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip.active { background: var(--accent); border-color: var(--accent); color: var(--bg-deep); }
.compound-row {
  display: flex; justify-content: space-between; align-items: center; gap: 14px;
  padding: 17px 20px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); margin-bottom: 9px; transition: border-color 0.15s ease, background 0.15s ease;
}
.compound-row:hover { border-color: var(--accent); background: var(--surface-2); }
.compound-row .name { font-family: var(--font-display); font-weight: 600; font-size: 1.14rem; }
.compound-row .cat { color: var(--muted); font-size: 0.9rem; font-style: italic; }

/* Utility */
.flex { display: flex; gap: 12px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.grid-2 { display: grid; gap: 32px; grid-template-columns: 1fr 1fr; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }