*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1e3a5f;
  --accent: #e8511a;
  --bg: #f4f5f7;
  --surface: #fff;
  --text: #2c3e50;
  --muted: #6b7280;
  --border: #d1d5db;
  --success: #27ae60;
  --error: #c0392b;
  --radius: 8px;
  --shadow: 0 1px 4px rgba(0,0,0,.1), 0 2px 8px rgba(0,0,0,.06);
  --shadow-hover: 0 4px 16px rgba(0,0,0,.12);

  --on-primary: #fff;
  --nav-link: #b8c8d8;
  --focus-ring: rgba(30,58,95,.12);
  --disabled-bg: #f3f4f6;
  --hairline: #f0f0f0;
  --zebra: #f9fafb;
  --error-bg: #fdf2f2;
  --info-bg: #f0f4f8;

  --badge-live-bg: #d1fae5;
  --badge-live-text: #065f46;
  --badge-soon-bg: #aaaaaa;
  --badge-soon-text: #fff;
  --badge-wip-bg: #af9000;
  --badge-wip-text: #fff;
  --badge-roadmap-bg: #651818;
  --badge-roadmap-text: #fff;

  --heading: var(--primary);
  --on-heading: var(--on-primary);
}

[data-theme="dark"] {
  --heading: #6ea8dc;
  --on-heading: #12151c;

  --bg: #12151c;
  --surface: #1b1f28;
  --text: #e5e9f0;
  --muted: #9aa4b2;
  --border: #2c333e;
  --error: #e57373;
  --shadow: 0 1px 4px rgba(0,0,0,.4), 0 2px 8px rgba(0,0,0,.3);
  --shadow-hover: 0 4px 16px rgba(0,0,0,.45);

  --focus-ring: rgba(232,81,26,.3);
  --disabled-bg: #262b35;
  --hairline: #2a303b;
  --zebra: #20262f;
  --error-bg: #33201f;
  --info-bg: #1c2733;

  --badge-live-bg: #0f3d2e;
  --badge-live-text: #6ee7b7;
  --badge-soon-bg: #4b5563;
  --badge-soon-text: #e5e7eb;
  --badge-wip-bg: #5c4a00;
  --badge-wip-text: #ffe066;
  --badge-roadmap-bg: #4a1010;
  --badge-roadmap-text: #f87171;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  transition: background-color .2s, color .2s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; width: 100%; }

/* ── Nav ─────────────────────────────── */
.navbar {
  background: var(--primary);
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--on-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}
.nav-brand span { color: var(--accent); }
.nav-links a {
  color: var(--nav-link);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.875rem;
  transition: color .15s;
}
.nav-links a:hover { color: var(--on-primary); }
.nav-links { display: flex; align-items: center; }

.theme-toggle {
  background: transparent;
  border: none;
  color: var(--on-primary);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.35rem;
  margin-left: 1.25rem;
  border-radius: 50%;
  transition: background-color .15s;
}
.theme-toggle:hover { background: rgba(255,255,255,.15); }

/* ── Layout ──────────────────────────── */
.container { max-width: 900px; margin: 0 auto; padding: 2rem 1.5rem; }

.page-header { margin-bottom: 1.75rem; }
.page-header h1 { font-size: 1.6rem; font-weight: 700; color: var(--heading); }
.page-header p { color: var(--muted); margin-top: 0.3rem; font-size: 0.95rem; }

/* ── Cards ───────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}
.card + .card { margin-top: 1.25rem; }
.card-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

/* ── Feature grid (home) ─────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 1rem;
}
.feature-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: box-shadow .15s, transform .15s;
}
.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}
.feature-card h3 { font-size: 0.95rem; font-weight: 700; color: var(--heading); }
.feature-card p { font-size: 0.82rem; color: var(--muted); flex: 1; line-height: 1.45; }
.feature-card .btn { margin-top: 0.6rem; text-align: center; }

/* ── Badges ──────────────────────────── */
.badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge-live { background: var(--badge-live-bg); color: var(--badge-live-text); }
.badge-soon { background: var(--badge-soon-bg); color: var(--badge-soon-text); }
.badge-wip { background: var(--badge-wip-bg); color: var(--badge-wip-text); }
.badge-roadmap { background: var(--badge-roadmap-bg); color: var(--badge-roadmap-text); }

/* ── Forms ───────────────────────────── */
.form-group { margin-bottom: 1.1rem; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text);
}
.form-hint { font-size: 0.75rem; color: var(--muted); margin-top: 0.25rem; }

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  background: var(--surface);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--heading);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
input:disabled, select:disabled {
  background: var(--disabled-bg);
  color: var(--muted);
  cursor: not-allowed;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }

.radio-group { display: flex; gap: 1rem; }
.radio-group label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 400;
  cursor: pointer;
}
.radio-group input[type="radio"] { width: auto; }

/* ── Buttons ─────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: filter .15s, box-shadow .15s;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: var(--on-primary); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:active { filter: brightness(0.95); }
.btn-outline { background: transparent; color: var(--heading); border: 1.5px solid var(--heading); }
.btn-outline:hover { background: var(--heading); color: var(--on-heading); }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.8rem; }
.btn-danger { background: var(--error); color: var(--on-primary); }
.btn-danger:hover { filter: brightness(1.1); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; filter: none; }

/* ── Results ─────────────────────────── */
.result { display: none; }
.result.visible { display: block; }

.result-big { font-size: 2.2rem; font-weight: 800; color: var(--heading); line-height: 1.1; }
.result-sub { font-size: 0.85rem; color: var(--muted); margin-top: 0.25rem; }

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--hairline);
}
.result-row:last-child { border-bottom: none; }
.result-label { font-size: 0.85rem; color: var(--muted); }
.result-value { font-size: 0.95rem; font-weight: 600; }

/* ── Training paces table ────────────── */
.paces-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.paces-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.paces-table th {
  background: var(--primary);
  color: var(--on-primary);
  padding: 0.55rem 0.85rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.paces-table td { padding: 0.55rem 0.85rem; border-bottom: 1px solid var(--hairline); }
.paces-table tr:last-child td { border-bottom: none; }
.paces-table tr:nth-child(even) td { background: var(--zebra); }
.vdot-score {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: 50%;
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

/* ── Mileage tracker ─────────────────── */
.activity-list { margin-top: 0.75rem; }
.activity-item {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
}
.activity-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}
.activity-header-right { display: flex; align-items: center; gap: 0.75rem; }
.activity-title { font-weight: 700; font-size: 0.95rem; }
.activity-type {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.activity-meta { font-size: 0.82rem; color: var(--muted); display: flex; gap: 1.25rem; flex-wrap: wrap; }

/* ── Split adder ─────────────────────── */
.split-list { list-style: none; }
.split-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--hairline);
}
.split-item:last-child { border-bottom: none; }
.split-num { font-size: 0.75rem; color: var(--muted); width: 28px; }
.split-time { font-weight: 600; flex: 1; }
.split-total { font-size: 2rem; font-weight: 800; color: var(--heading); }

/* ── Stub / coming soon ──────────────── */
.stub-box { text-align: center; padding: 4rem 2rem; }
.stub-badge { margin-bottom: 1.25rem; }
.stub-title { font-size: 1.5rem; font-weight: 700; color: var(--heading); margin-bottom: 0.5rem; }
.stub-desc { color: var(--muted); max-width: 420px; margin: 0 auto 1.5rem; line-height: 1.6; }

/* ── Messages ────────────────────────── */
.error-msg {
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  padding: 0.6rem 0.85rem;
  background: var(--error-bg);
  border-radius: var(--radius);
  border-left: 3px solid var(--error);
  display: none;
}
.error-msg.visible { display: block; }

.info-note {
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--info-bg);
  border-radius: var(--radius);
  padding: 0.6rem 0.85rem;
  margin-bottom: 1rem;
  border-left: 3px solid var(--heading);
}

.empty-state { text-align: center; color: var(--muted); padding: 2rem; font-size: 0.9rem; }

.footer {
  font-size: 0.8rem;
  color: var(--heading);
  letter-spacing: -0.3px;
  font-weight: 200;
  padding: 1rem 1.5rem;
  text-align: center;
  flex-shrink: 0;
}