:root {
  color-scheme: light dark;
  --bg: #eef1ef;
  --card-bg: #ffffff;
  --text: #16202a;
  --muted: #62707a;
  --border: #dbe2e0;
  --accent: #14776a;
  --accent-contrast: #ffffff;
  --bike: #c97a25;
  --run: #c14a4a;
  --rest: #97a3a8;

  --font-display: ui-serif, "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1116;
    --card-bg: #161d24;
    --text: #e7edee;
    --muted: #8b9aa1;
    --border: #263039;
    --accent: #4bcdb4;
    --accent-contrast: #05201b;
    --bike: #e0964a;
    --run: #e07070;
    --rest: #56636a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 14px 40px;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 10px 12px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topnav a {
  color: var(--text);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
}

.topnav a:hover { background: var(--border); }
.topnav .logout { margin-left: auto; color: var(--muted); }

.daynav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 12px 0;
}

.daynav h1 { font-family: var(--font-display); font-size: 19px; margin: 0; text-align: center; flex: 1; }
.daynav a { color: var(--accent); text-decoration: none; font-size: 14px; white-space: nowrap; }

.muted { color: var(--muted); font-size: 14px; }

.markdown table { width: 100%; border-collapse: collapse; margin: 8px 0; }
.markdown table td, .markdown table th { border: 1px solid var(--border); padding: 4px 8px; font-size: 13px; }

.chat { display: flex; flex-direction: column; gap: 10px; }
.bubble { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); }
.bubble-user { background: var(--card-bg); align-self: flex-end; margin-left: 15%; }
.bubble-model { background: var(--card-bg); align-self: flex-start; margin-right: 15%; }
.bubble-meta { font-size: 11px; color: var(--muted); margin-bottom: 4px; }

.chat-form { display: flex; gap: 8px; margin-top: 12px; position: sticky; bottom: 0; background: var(--bg); padding: 10px 0; }
.chat-form input { flex: 1; padding: 10px; border-radius: 8px; border: 1px solid var(--border); font-size: 15px; background: var(--card-bg); color: var(--text); }
.chat-form button { padding: 10px 16px; border-radius: 8px; border: none; background: var(--accent); color: var(--accent-contrast); font-size: 15px; cursor: pointer; }
.chat-form button:disabled { opacity: 0.6; }

.save-btn {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 20px;
}

/* Training plan page - week-shape "split sheet" */
.plan-header { margin: 18px 0 14px; }
.section-eyebrow { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }
.plan-title { font-family: var(--font-display); font-size: 28px; margin: 0 0 6px; font-weight: 600; }

.plan-horizon {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 64px;
  margin: 6px 0 22px;
  padding: 0 2px;
}
.plan-bar { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; }
.plan-bar-fill { width: 100%; border-radius: 4px 4px 2px 2px; background: var(--rest); height: 12%; transition: height 0.2s ease; }
.plan-bar-level-1 .plan-bar-fill { height: 40%; }
.plan-bar-level-2 .plan-bar-fill { height: 70%; }
.plan-bar-level-3 .plan-bar-fill { height: 100%; }
.plan-bar-zone2 .plan-bar-fill { background: var(--accent); }
.plan-bar-intensiv .plan-bar-fill { background: var(--bike); }
.plan-bar-lang .plan-bar-fill { background: var(--run); }
.plan-bar-day { font-family: var(--font-mono); font-size: 10px; color: var(--muted); margin-top: 4px; text-transform: uppercase; }

.plan-week { display: flex; flex-direction: column; gap: 10px; }
.plan-day {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--rest);
  border-radius: 10px;
  padding: 14px 16px;
  transition: border-left-color 0.15s ease;
}
.plan-day-zone2 { border-left-color: var(--accent); }
.plan-day-intensiv { border-left-color: var(--bike); }
.plan-day-lang { border-left-color: var(--run); }

.plan-day-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.plan-day-num { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
.plan-day-head h2 { font-family: var(--font-display); font-size: 18px; margin: 0; text-transform: none; letter-spacing: 0; color: var(--text); flex: 1; }
.plan-count, .plan-color {
  padding: 5px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 12px;
  font-family: var(--font-mono);
}

.plan-session {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr 0.8fr;
  gap: 6px;
  margin-bottom: 8px;
}
.plan-session select, .plan-session input {
  width: 100%;
  padding: 7px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
}
.plan-session input.plan-time { font-family: var(--font-mono); }

@media (max-width: 480px) {
  .plan-session { grid-template-columns: 1fr; }
}

.plan-focus {
  width: 100%;
  padding: 7px 8px;
  border-radius: 6px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 14px;
}

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-form { display: flex; flex-direction: column; gap: 10px; width: 260px; }
.login-form h1 { font-family: var(--font-display); font-size: 22px; text-align: center; margin-bottom: 8px; }
.login-form input, .login-form button { padding: 10px; border-radius: 8px; border: 1px solid var(--border); font-size: 15px; }
.login-form button { background: var(--accent); color: var(--accent-contrast); border: none; cursor: pointer; }
.error { color: #d64545; font-size: 14px; text-align: center; }