@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&family=DM+Serif+Display:ital@0;1&display=swap');

:root {
  --bg:          #f9f8f5;
  --bg-card:     #ffffff;
  --ink:         #111111;
  --ink-soft:    #555555;
  --ink-muted:   #999999;
  --border:      #e8e8e4;
  --border-soft: #f0efeb;
  --accent:      #2563eb;
  --accent-soft: #eff4ff;
  --warm:        #c2410c;
  --tag-bg:      #f0efeb;

  --font-sans:    'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'DM Serif Display', Georgia, serif;

  --r: 10px;
  --r-sm: 6px;
  --max-w: 760px;
  --transition: 150ms ease;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249, 248, 245, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  background: var(--tag-bg);
}

/* ── LAYOUT ── */
.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── HOME ── */
.home-hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--border);
}

.home-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 60px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 20px;
}

.home-hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.home-hero p {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 480px;
  line-height: 1.6;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--r);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--ink);
  color: #fff;
}
.btn-primary:hover { background: #333; }

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--tag-bg); color: var(--ink); }

.home-section {
  padding: 56px 0;
}

.home-section + .home-section {
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

.home-section h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.home-section > p {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 28px;
}

/* ── SUBJECT CARD (home preview) ── */
.materias-grid {
  display: grid;
  gap: 12px;
}

.materia-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  color: inherit;
}

.materia-card:hover {
  border-color: #c8c8c4;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.materia-card-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.materia-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.materia-card-info h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.materia-card-info p {
  font-size: 13px;
  color: var(--ink-muted);
}

.materia-card-arrow {
  font-size: 18px;
  color: var(--ink-muted);
  transition: transform var(--transition), color var(--transition);
}

.materia-card:hover .materia-card-arrow {
  transform: translateX(3px);
  color: var(--ink);
}

/* ── STUDENT PAGE ── */
.estudiante-header {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}

.estudiante-header h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.estudiante-header p {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 440px;
}

/* ── MATERIA FULL CARD ── */
.materia-full-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 20px;
}

.materia-full-header {
  padding: 24px 28px;
  border-bottom: 1px solid var(--border-soft);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.materia-full-header-left {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.materia-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.materia-title-group h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.materia-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--tag-bg);
  color: var(--ink-soft);
}

.materia-full-desc {
  padding: 20px 28px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.6;
  border-bottom: 1px solid var(--border-soft);
}

.recursos-list {
  padding: 16px 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recurso-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--r);
  border: 1px solid var(--border);
  background: var(--bg);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition), background var(--transition);
}

.recurso-item:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.recurso-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.recurso-tipo-chip {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 20px;
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}

.recurso-titulo {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.recurso-desc {
  font-size: 12px;
  color: var(--ink-muted);
  margin-top: 1px;
}

.recurso-arrow {
  font-size: 16px;
  color: var(--ink-muted);
  transition: transform var(--transition), color var(--transition);
  flex-shrink: 0;
}

.recurso-item:hover .recurso-arrow {
  transform: translateX(3px);
  color: var(--accent);
}

/* ── VIDEO EMBED ── */
.recurso-video {
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--bg);
}

.recurso-video-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-soft);
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
}

.video-wrapper iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.materia-footer {
  padding: 12px 28px;
  border-top: 1px solid var(--border-soft);
  font-size: 12px;
  color: var(--ink-muted);
}

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 80px;
  padding: 32px 0;
}

.site-footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-footer p {
  font-size: 13px;
  color: var(--ink-muted);
}

.site-footer a {
  font-size: 13px;
  color: var(--ink-muted);
  transition: color var(--transition);
}
.site-footer a:hover { color: var(--ink); }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .home-hero { padding: 48px 0 40px; }
  .home-hero h1 { font-size: 36px; }
  .home-hero p { font-size: 16px; }
  .materia-full-header { flex-direction: column; }
  .site-footer-inner { flex-direction: column; text-align: center; }
}