/* GEAR design system — Phase 7.5. "Modern dashboard" look (dark sidebar, light content,
   cards, soft shadows) chosen explicitly by the product owner over a clinical-white or
   dark-mode-first alternative. Hand-authored, no framework/build step, matching the
   project's lightweight-tooling preference — see docs/spec/DECISIONS.md's general bias
   toward minimal dependencies. Audience is coaches, not developers, so legibility and
   obvious affordances (clear buttons, generous spacing, plain labels) are prioritized
   over density. */

:root {
  color-scheme: light dark;

  /* Palette */
  --color-bg: #f5f6fb;
  --color-surface: #ffffff;
  --color-border: #e3e5ef;
  --color-border-strong: #cfd3e3;
  --color-text: #1b1f2e;
  --color-text-muted: #66708a;
  --color-text-faint: #9aa2b9;

  --color-accent: #4f6df5;
  --color-accent-hover: #3d59da;
  --color-accent-bg: #eef1fe;

  --color-success: #157a4a;
  --color-success-bg: #e5f6ed;
  --color-danger: #c73434;
  --color-danger-bg: #fceeee;
  --color-warning: #a15c07;
  --color-warning-bg: #fdf1de;
  --color-info: #2563eb;
  --color-info-bg: #e9f0fe;
  --color-neutral: #5b6178;
  --color-neutral-bg: #edeef4;

  --sidebar-bg: #171c2e;
  --sidebar-bg-active: #262d47;
  --sidebar-text: #aab0cc;
  --sidebar-text-active: #ffffff;
  --sidebar-brand: #ffffff;
  --sidebar-width: 248px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(20, 24, 44, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 24, 44, 0.08);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #11131c;
    --color-surface: #181c29;
    --color-border: #2a2f42;
    --color-border-strong: #3a3f57;
    --color-text: #e9ebf5;
    --color-text-muted: #a3aac4;
    --color-text-faint: #767c96;
    --color-accent-bg: #1c2440;
    --color-success-bg: #12281f;
    --color-danger-bg: #2c1a1a;
    --color-warning-bg: #2c2113;
    --color-info-bg: #17233d;
    --color-neutral-bg: #22273a;
    --sidebar-bg: #0c0e16;
    --sidebar-bg-active: #1d2338;
  }
}

/* --- Reset & base elements --- */

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

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.55;
  font-size: 15px;
}

h1, h2, h3, h4 { line-height: 1.25; font-weight: 650; margin: 0 0 var(--space-3); color: var(--color-text); }
h1 { font-size: 1.7rem; }
h2 { font-size: 1.25rem; margin-top: var(--space-6); }
h3 { font-size: 1.05rem; margin-top: var(--space-5); }

p { margin: 0 0 var(--space-3); }
small { color: var(--color-text-muted); font-size: 0.85rem; }

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

hr { border: none; border-top: 1px solid var(--color-border); margin: var(--space-5) 0; }

.muted { color: var(--color-text-muted); }

/* --- App shell: sidebar + content --- */

.sidebar-toggle-checkbox { display: none; }

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: var(--space-5) var(--space-3);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  display: block;
  color: var(--sidebar-brand);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  padding: 0 var(--space-3) var(--space-5);
}
.sidebar-brand:hover { text-decoration: none; }

.sidebar-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--sidebar-text);
  padding: 0.6rem var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
}
.sidebar-nav a:hover { background: var(--sidebar-bg-active); color: var(--sidebar-text-active); text-decoration: none; }
.sidebar-nav a.active { background: var(--color-accent); color: #ffffff; }
.sidebar-nav a svg { flex-shrink: 0; opacity: 0.9; }

.sidebar-section-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  padding: var(--space-4) var(--space-3) var(--space-1);
}

.sidebar-footer { padding-top: var(--space-4); border-top: 1px solid rgba(255, 255, 255, 0.08); margin-top: var(--space-4); }
.sidebar-footer form { margin: 0; }
.sidebar-footer .btn { width: 100%; }

.hamburger {
  display: none;
  cursor: pointer;
  font-size: 1.3rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.hamburger:hover { background: var(--color-neutral-bg); }

.sidebar-scrim { display: none; }

.app-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  display: none;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 5;
}
.topbar-brand { font-weight: 700; }

.content { padding: var(--space-6) var(--space-6) var(--space-8); max-width: 1080px; width: 100%; }

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 20;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-md);
  }
  .sidebar-toggle-checkbox:checked ~ .app-shell .sidebar { transform: translateX(0); }
  .sidebar-toggle-checkbox:checked ~ .app-shell .sidebar-scrim {
    display: block; position: fixed; inset: 0; background: rgba(10, 12, 20, 0.4); z-index: 15;
  }
  .topbar { display: flex; }
  .content { padding: var(--space-4); }
}

/* --- Auth (login/MFA/accept-invite) layout --- */

.auth-body { background: var(--sidebar-bg); min-height: 100vh; }
.auth-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: var(--space-5); }
.auth-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  width: 100%;
  max-width: 420px;
}
.auth-brand { font-weight: 700; font-size: 1.3rem; margin-bottom: var(--space-5); color: var(--color-text); }
.auth-messages { max-width: 420px; margin: var(--space-5) auto 0; padding: 0 var(--space-5); }

/* --- Cards --- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.card h2:first-child, .card h3:first-child { margin-top: 0; }

/* --- Page header (athlete tab shell) --- */

.page-header { margin-bottom: var(--space-5); }
.page-header-top { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-1); }
.page-header-top h1 { margin: 0; }
.page-header-meta { color: var(--color-text-muted); margin-bottom: var(--space-4); }
.page-header-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-4); }

/* --- Buttons --- */

.btn, button, input[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
  line-height: 1.3;
}
.btn:hover, button:hover, input[type="submit"]:hover { background: var(--color-neutral-bg); text-decoration: none; }

/* Primary is opt-in (class="btn-primary"), not the default for every type="submit" —
   a page's one main action (Save, Add, Log in) should read as more important than a
   "Remove" button buried in a table row, and both are technically type="submit". */
.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}
.btn-primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); }

.btn-danger { background: var(--color-danger); border-color: var(--color-danger); color: #ffffff; }
.btn-danger:hover { background: #a92727; border-color: #a92727; }

.btn-ghost { background: transparent; border-color: transparent; color: var(--sidebar-text); }
.btn-ghost:hover { background: var(--sidebar-bg-active); color: var(--sidebar-text-active); }

.btn-sm { padding: 0.3rem 0.65rem; font-size: 0.82rem; }

.btn-link {
  background: none; border: none; color: var(--color-accent); font-weight: 600; padding: 0; text-decoration: underline;
}
.btn-link:hover { background: none; color: var(--color-accent-hover); }

/* A plain-text secondary action that shouldn't compete visually with the primary button. */
.action-link { font-size: 0.9rem; }

/* --- Forms --- */

form p { margin: 0 0 var(--space-4); }

label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="date"], input[type="time"], input[type="file"], select, textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
}
textarea { min-height: 6rem; resize: vertical; }

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-bg);
}

input[type="checkbox"], input[type="radio"] { width: auto; margin-right: var(--space-2); accent-color: var(--color-accent); }

select[multiple] { min-height: 6rem; }

.helptext, form small { display: block; margin-top: var(--space-1); color: var(--color-text-muted); font-size: 0.82rem; }

.errorlist { list-style: none; padding: 0; margin: var(--space-1) 0 0; color: var(--color-danger); font-size: 0.85rem; }

.form-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  background: var(--color-bg);
}
.form-section > h3, .form-section > h4 { margin-top: 0; }

details.advanced-options {
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  background: var(--color-bg);
}
details.advanced-options summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-accent);
  list-style: none;
}
details.advanced-options summary::-webkit-details-marker { display: none; }
details.advanced-options summary::before { content: "▸ "; }
details.advanced-options[open] summary::before { content: "▾ "; }
details.advanced-options > *:last-child { margin-bottom: 0; }

.inline-form { display: inline; margin: 0; }

/* --- Tables --- */

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 0.65rem 0.75rem; border-bottom: 1px solid var(--color-border); }
th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-muted); font-weight: 600; }
tbody tr:hover { background: var(--color-bg); }
td small { display: block; }

.table-wrap { overflow-x: auto; }

/* --- Badges (athlete state, invite status, etc.) --- */

.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}
.badge-natural { background: var(--color-success-bg); color: var(--color-success); }
.badge-trt { background: var(--color-info-bg); color: var(--color-info); }
.badge-enhanced { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-unknown { background: var(--color-neutral-bg); color: var(--color-neutral); }
.badge-pending { background: var(--color-info-bg); color: var(--color-info); }
.badge-accepted { background: var(--color-success-bg); color: var(--color-success); }
.badge-expired, .badge-revoked { background: var(--color-neutral-bg); color: var(--color-neutral); }

/* --- Stat grid --- */

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: var(--space-4); margin: var(--space-4) 0 var(--space-5); }
.stat-tile { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); box-shadow: var(--shadow-sm); }
.stat-tile .label { font-size: 0.78rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: var(--space-1); }
.stat-tile .value { font-size: 1.5rem; font-weight: 700; }
.stat-tile small { display: block; margin-top: var(--space-1); }

/* --- Tabs --- */

.tab-nav { display: flex; gap: var(--space-1); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-5); flex-wrap: wrap; }
.tab-nav a {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem var(--space-4);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  margin-bottom: -1px;
  border-bottom: 2px solid transparent;
}
.tab-nav a:hover { color: var(--color-text); text-decoration: none; background: var(--color-bg); }
.tab-nav a.active { color: var(--color-accent); border-bottom-color: var(--color-accent); }

/* --- Timeline --- */

.timeline-list { list-style: none; padding: 0; margin: 0; }
.timeline-list li { padding: var(--space-3) 0; border-bottom: 1px solid var(--color-border); display: flex; gap: var(--space-4); align-items: baseline; }
.timeline-list .tl-date { min-width: 6.5rem; color: var(--color-text-muted); font-size: 0.85rem; flex-shrink: 0; }
.timeline-list .tl-category { min-width: 8rem; font-weight: 600; flex-shrink: 0; }

/* --- Messages / alerts --- */

.messages { list-style: none; padding: 0; margin: 0 0 var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); }
.messages li {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-border-strong);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}
.messages .success { border-left-color: var(--color-success); background: var(--color-success-bg); }
.messages .error { border-left-color: var(--color-danger); background: var(--color-danger-bg); }
.messages .info { border-left-color: var(--color-info); background: var(--color-info-bg); }

/* --- Empty states --- */

.empty-state { text-align: center; padding: var(--space-8) var(--space-4); color: var(--color-text-muted); }
.empty-state .empty-icon { font-size: 2rem; margin-bottom: var(--space-3); opacity: 0.6; }
.empty-state p { margin: 0 auto var(--space-3); max-width: 32rem; }

/* --- Misc --- */

.qr { display: block; margin: var(--space-4) 0; border-radius: var(--radius-md); }
.secret { font-family: ui-monospace, "SF Mono", Consolas, monospace; background: var(--color-bg); padding: 0.15rem 0.4rem; border-radius: 4px; user-select: all; }