/* Simple Lab Tools — shared design system (scientific & precise, light).
   Tokens + global chrome (header, auth, modal) + shared components + home page.
   Component styles are prefixed `slt-` so they don't collide with each tool's
   own internal styles. */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --bg: #f5f7f9;
  --surface: #ffffff;
  --surface-2: #fafbfc;
  --border: #e4e8ec;
  --border-strong: #cdd5dd;
  --ink: #0e1620;
  --ink-2: #3d4854;
  --muted: #6a7480;
  --accent: #1a5fd0;
  --accent-hover: #1449a6;
  --accent-soft: #ecf2fd;
  --ok: #0d8a5c;
  --danger: #d33f3f;
  --warn: #b7791f;

  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(14, 22, 32, .05);
  --shadow: 0 1px 3px rgba(14, 22, 32, .08), 0 1px 2px rgba(14, 22, 32, .04);
  --shadow-lg: 0 12px 32px rgba(14, 22, 32, .14);
  --header-h: 56px;
}

/* ── Shared header ─────────────────────────────────────────────────────────── */
#site-header.slt-header {
  box-sizing: border-box;
  background: var(--surface);
  color: var(--ink);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding: 0 18px;
  min-height: var(--header-h);
  font-family: var(--font-sans);
}
#site-header .slt-left { display: flex; align-items: center; gap: 18px; min-width: 0; flex: 1 1 auto; }
#site-header .slt-brand {
  display: flex; align-items: center; gap: 9px; text-decoration: none;
  color: var(--ink); flex-shrink: 0;
}
#site-header .slt-brand .slt-logo { color: var(--accent); line-height: 0; }
#site-header .slt-wordmark {
  font-weight: 700; font-size: 0.9rem; letter-spacing: -0.01em; white-space: nowrap;
}
#site-header .slt-wordmark .dim { color: var(--muted); font-weight: 600; }
#site-header .slt-nav { display: flex; gap: 2px; flex-wrap: wrap; min-width: 0; }
#site-header .slt-nav a {
  color: var(--ink-2); text-decoration: none; padding: 6px 10px;
  border-radius: var(--radius-sm); font-size: 0.82rem; font-weight: 500;
  line-height: 1.2; white-space: nowrap; transition: background .15s, color .15s;
}
#site-header .slt-nav a:hover { background: #f0f2f5; color: var(--ink); }
#site-header .slt-nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
#site-header .slt-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

@media (max-width: 1180px) { #site-header .slt-wordmark .dim { display: none; } }
@media (max-width: 720px) {
  #site-header.slt-header { flex-wrap: wrap; padding: 8px 14px; }
  #site-header .slt-nav a { padding: 5px 8px; font-size: 0.78rem; }
}
@media print { #site-header, .slt-modal-backdrop { display: none !important; } }

/* ── Buttons & inputs (shared, opt-in via class) ──────────────────────────── */
.slt-btn {
  font-family: var(--font-sans); font-size: 0.82rem; font-weight: 600;
  padding: 7px 13px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--ink); cursor: pointer; line-height: 1.2;
  transition: background .15s, border-color .15s, box-shadow .15s; white-space: nowrap;
}
.slt-btn:hover { background: #f4f6f8; border-color: var(--muted); }
.slt-btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.slt-btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.slt-btn-ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
.slt-btn-ghost:hover { background: #f0f2f5; color: var(--ink); }
.slt-btn-sm { padding: 5px 9px; font-size: 0.78rem; }
.slt-btn-danger { color: var(--danger); }
.slt-btn-danger:hover { background: #fdecec; border-color: var(--danger); }

.slt-input, .slt-select {
  font-family: var(--font-sans); font-size: 0.86rem; color: var(--ink);
  padding: 8px 10px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); width: 100%; box-sizing: border-box; transition: border-color .15s, box-shadow .15s;
}
.slt-input:focus, .slt-select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.slt-input.mono { font-family: var(--font-mono); letter-spacing: 0.08em; }

/* ── Auth widget (top-right) ──────────────────────────────────────────────── */
.slt-auth { position: relative; font-family: var(--font-sans); }
.slt-user-btn {
  display: flex; align-items: center; gap: 8px; padding: 5px 8px 5px 6px;
  border: 1px solid var(--border); border-radius: 99px; background: var(--surface);
  cursor: pointer; font-size: 0.8rem; color: var(--ink); max-width: 210px;
}
.slt-user-btn:hover { background: #f4f6f8; }
.slt-avatar {
  width: 24px; height: 24px; border-radius: 50%; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 0.72rem; font-weight: 700; flex-shrink: 0;
}
.slt-user-email { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--ink-2); }
.slt-caret { color: var(--muted); font-size: 0.7rem; }

.slt-menu {
  position: absolute; top: calc(100% + 8px); right: 0; width: 264px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-lg); padding: 12px; z-index: 1000; display: none;
}
.slt-menu.open { display: block; }
.slt-menu-label {
  font-size: 0.66rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); margin: 2px 2px 6px;
}
.slt-menu-row { display: flex; gap: 6px; margin-top: 8px; }
.slt-menu-sep { height: 1px; background: var(--border); margin: 12px -12px; }
.slt-ws-hint { font-size: 0.72rem; color: var(--muted); line-height: 1.4; margin-top: 6px; }
.slt-ws-hint.clickable { cursor: pointer; }
.slt-ws-hint.clickable:hover { color: var(--ink-2); }
.slt-code-chip {
  font-family: var(--font-mono); background: var(--accent-soft); color: var(--accent);
  padding: 1px 6px; border-radius: 4px; font-weight: 600; letter-spacing: 0.06em;
}

/* ── Modal (sign in) ──────────────────────────────────────────────────────── */
.slt-modal-backdrop {
  position: fixed; inset: 0; background: rgba(14, 22, 32, .42); backdrop-filter: blur(2px);
  display: none; align-items: center; justify-content: center; z-index: 2000; padding: 20px;
}
.slt-modal-backdrop.open { display: flex; }
.slt-modal {
  width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 26px; font-family: var(--font-sans);
}
.slt-modal h2 { margin: 0 0 6px; font-size: 1.15rem; color: var(--ink); letter-spacing: -0.01em; }
.slt-modal p.sub { margin: 0 0 18px; font-size: 0.84rem; color: var(--muted); line-height: 1.5; }
.slt-field-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted); display: block; margin: 12px 0 5px;
}
.slt-modal .slt-btn { width: 100%; justify-content: center; margin-top: 14px; padding: 10px; }
.slt-modal-status { font-size: 0.78rem; color: var(--muted); margin-top: 12px; min-height: 1em; text-align: center; }
.slt-modal-status.err { color: var(--danger); }
.slt-modal-close {
  float: right; background: none; border: none; color: var(--muted); cursor: pointer;
  font-size: 1.3rem; line-height: 1; margin: -8px -6px 0 0; padding: 4px;
}
.slt-modal-close:hover { color: var(--ink); }

/* ── Home page ────────────────────────────────────────────────────────────── */
.slt-home { max-width: 1200px; margin: 0 auto; padding: 40px 24px 60px; font-family: var(--font-sans); }
.slt-hero { margin-bottom: 36px; }
.slt-hero .kicker {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.slt-hero h1 { margin: 0 0 10px; font-size: 2.1rem; letter-spacing: -0.02em; color: var(--ink); line-height: 1.1; }
.slt-hero p { margin: 0; font-size: 1rem; color: var(--ink-2); max-width: 620px; line-height: 1.55; }

.slt-section-head {
  display: flex; align-items: baseline; gap: 10px; margin: 28px 0 14px;
  border-bottom: 1px solid var(--border); padding-bottom: 8px;
}
.slt-section-head h2 { margin: 0; font-size: 0.95rem; color: var(--ink); font-weight: 700; }
.slt-section-head .count { font-family: var(--font-mono); font-size: 0.76rem; color: var(--muted); }

.slt-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); gap: 14px;
}
.slt-card {
  position: relative; display: flex; flex-direction: column; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 18px 16px;
  text-decoration: none; color: inherit; transition: border-color .15s, box-shadow .15s, transform .15s;
}
.slt-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-2px); }
.slt-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.slt-card-icon {
  width: 38px; height: 38px; border-radius: var(--radius-sm); background: var(--accent-soft);
  color: var(--accent); display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.slt-card-tag {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 2px 6px;
}
.slt-card-tag.new { color: var(--ok); border-color: #b8e2cf; background: #f0faf5; }
.slt-card h3 { margin: 0 0 6px; font-size: 0.98rem; color: var(--ink); letter-spacing: -0.01em; }
.slt-card p { margin: 0; font-size: 0.82rem; color: var(--muted); line-height: 1.5; flex: 1; }
.slt-card .slt-card-cta {
  margin-top: 14px; font-size: 0.8rem; font-weight: 600; color: var(--accent);
  display: inline-flex; align-items: center; gap: 5px;
}
.slt-card:hover .slt-card-cta .arrow { transform: translateX(2px); }
.slt-card-cta .arrow { transition: transform .15s; }

.slt-foot { text-align: center; color: var(--muted); font-size: 0.8rem; padding: 30px 0 6px; }
.slt-foot a { color: var(--accent); text-decoration: none; }