/* theme.css — Mandarin. Tokens extraidos del flyer de Peter:
   papel kraft, azul marino, burdeos, titulares serif con contraste alto. */

:root {
  --bg: #F2E9D8;
  --bg-alt: #EADFC8;
  --ink: #26221C;
  --ink-soft: #5C544A;
  --navy: #1E3552;
  --accent: #8C2F27;
  --on-accent: #F7F1E4;
  --rule: #C9B99B;
  --focus: #1E3552;

  --font-display: "Bookman Old Style", "Georgia", "Times New Roman", serif;
  --font-body: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;

  --radius-photo: 4px;
  --radius-btn: 3px;
  --shadow-photo: 0 18px 40px rgba(38, 34, 28, 0.22);
}

/* Textura de papel: dos gradientes muy suaves, sin imagen que descargar. */
body {
  background-image:
    radial-gradient(circle at 18% 12%, rgba(255, 255, 255, 0.55), transparent 42%),
    radial-gradient(circle at 82% 78%, rgba(201, 185, 155, 0.35), transparent 48%);
  background-attachment: fixed;
}

.hero-title {
  color: var(--navy);
  letter-spacing: -0.015em;
}

.hero-title .lessons {
  display: block;
  font-size: 0.62em;
  color: var(--accent);
  letter-spacing: 0.005em;
  text-transform: uppercase;
  font-family: var(--font-body);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 0.98;
  margin-top: 0.25rem;
}

.hero-sub { color: var(--navy); }

/* Sello 中文教学, replica del cuadro rojo del flyer */
.seal {
  position: absolute;
  top: clamp(3.5rem, 9vw, 4.5rem);
  right: clamp(1.25rem, 4vw, 2rem);
  writing-mode: vertical-rl;
  background: var(--accent);
  color: var(--on-accent);
  font-size: clamp(0.9rem, 2.6vw, 1.15rem);
  letter-spacing: 0.28em;
  padding: 0.85rem 0.5rem;
  border-radius: 2px;
  box-shadow: 0 6px 18px rgba(140, 47, 39, 0.3);
}

.section-title { color: var(--navy); }

.about { background: var(--bg-alt); }

/* Franja inferior burdeos, como el pie del flyer */
.tagline {
  background: var(--accent);
  color: var(--on-accent);
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(0.75rem, 2.4vw, 0.9375rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding-block: 1.1rem;
}

/* Chapa 你好 */
.badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg);
  color: var(--accent);
  text-align: center;
  font-family: var(--font-display);
  line-height: 1.15;
  margin-inline: auto;
  margin-bottom: 1.75rem;
}

.badge .hanzi { font-size: 1.6rem; letter-spacing: 0.06em; }
.badge .say { font-size: 0.6875rem; letter-spacing: 0.1em; text-transform: uppercase; }

footer { color: var(--ink-soft); }