/* ==========================================================
   DonaTrainer Base CSS — Unified Premium Theme
   ========================================================== */

/* ---------- Theme & Color Tokens (Amadeus-Inspired) ---------- */
:root {
  /* Surfaces */
  --bg: #0A101A;
  --panel: #121A26;
  --panel-2: #1A2433;
  --line: #2A3649;

  /* Text */
  --text: #E1E8F2;
  --muted: #8B9BB0;

  /* Brand & Accents */
  --brand: #257DFF;
  --brand-strong: #0A68FF;
  --brand-light: rgba(37, 125, 255, 0.1);

  /* Status Colors */
  --ok: #28A745;
  --warn: #FFC107;
  --err: #DC3545;
  --hint: #17A2B8;

  /* Layout & Effects */
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 8px 24px rgba(0, 0, 0, .3);
  --container: 1140px;

  /* Typography */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* ---------- CSS Reset & Base Styles ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: inline-block; max-width: 100%; height: auto; vertical-align: middle; }
a { color: var(--brand); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--brand-strong); }
h1, h2, h3 { margin: 0 0 .8em; line-height: 1.2; font-weight: 600; }
h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.1rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }
ul { list-style: none; margin: 0; padding: 0; }
code { font-family: var(--font-mono); background: var(--panel-2); padding: 2px 6px; border-radius: 4px; }

/* ---------- Layout Components ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.grid-layout { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s, transform 0.1s, border-color 0.2s;
}
.btn:hover { background: var(--line); }
.btn:active { transform: translateY(1px); }

.btn.primary {
  background: linear-gradient(180deg, var(--brand), var(--brand-strong));
  border-color: var(--brand-strong);
  color: #fff;
}
.btn.primary:hover { filter: brightness(1.1); }
.btn.xl { padding: 14px 28px; font-size: 1.1rem; border-radius: var(--radius); }
.btn.sm { padding: 6px 12px; font-size: 0.8rem; }