/* ============================================================
   Aula Sofia — Estilos compartidos
   ============================================================ */

* { box-sizing: border-box; }

:root {
  --indigo-50: #EEF2FF;
  --indigo-100: #E0E7FF;
  --indigo-500: #6366F1;
  --indigo-600: #4F46E5;
  --indigo-700: #4338CA;
  --purple-500: #A855F7;
  --purple-600: #9333EA;
  --pink-500: #EC4899;
  --amber-400: #FBBF24;
  --amber-500: #F59E0B;
  --emerald-500: #10B981;
  --emerald-600: #059669;
  --rose-500: #F43F5E;
  --rose-600: #E11D48;
  --slate-50: #F8FAFC;
  --slate-100: #F1F5F9;
  --slate-200: #E2E8F0;
  --slate-300: #CBD5E1;
  --slate-400: #94A3B8;
  --slate-500: #64748B;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1E293B;
  --slate-900: #0F172A;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #EEF2FF 0%, #FAF5FF 50%, #FDF2F8 100%);
  min-height: 100vh;
  color: var(--slate-900);
  -webkit-font-smoothing: antialiased;
}

/* ============ TOPBAR ============ */
.sofia-topbar {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--slate-200);
  padding: 0.85rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.sofia-topbar .logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--slate-900);
}
.sofia-topbar .logo .emoji {
  font-size: 1.6rem;
}
.sofia-topbar .logo .brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.sofia-topbar .logo .brand small {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--slate-500);
  margin-top: -2px;
  letter-spacing: 0;
}
.sofia-topbar .nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.sofia-topbar .nav a {
  color: var(--slate-600);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  transition: color 0.15s;
}
.sofia-topbar .nav a:hover {
  color: var(--indigo-600);
}
.sofia-topbar .user-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--indigo-50);
  border-radius: 99px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  color: var(--indigo-700);
  font-weight: 600;
}

/* ============ FOOTER ============ */
.sofia-footer {
  background: rgba(255,255,255,0.7);
  border-top: 1px solid var(--slate-200);
  padding: 1.5rem;
  text-align: center;
  color: var(--slate-500);
  font-size: 0.85rem;
  margin-top: 3rem;
}

/* ============ BOTONES ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: 10px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  line-height: 1.2;
}
.btn-primary {
  background: linear-gradient(135deg, var(--indigo-600), var(--purple-600));
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.4);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}
.btn-amber {
  background: linear-gradient(135deg, var(--amber-400), var(--amber-500));
  color: var(--slate-900);
  box-shadow: 0 4px 12px rgba(251, 191, 36, 0.35);
}
.btn-amber:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(251, 191, 36, 0.5);
}
.btn-ghost {
  background: transparent;
  color: var(--slate-700);
  border: 1.5px solid var(--slate-300);
}
.btn-ghost:hover {
  background: var(--slate-50);
  border-color: var(--slate-400);
}
.btn-danger {
  background: var(--rose-500);
  color: #fff;
}
.btn-danger:hover {
  background: var(--rose-600);
}
.btn-small {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
}
.btn-large {
  padding: 0.9rem 1.6rem;
  font-size: 1.05rem;
}

/* ============ CARDS ============ */
.sofia-card {
  background: #fff;
  border-radius: 16px;
  padding: 1.5rem;
  border: 1px solid var(--slate-200);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}
.sofia-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--slate-900);
  letter-spacing: -0.02em;
}
.sofia-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--slate-800);
}

/* ============ FORMS ============ */
.sofia-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.sofia-form label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--slate-700);
  margin-bottom: 0.35rem;
}
.sofia-form input,
.sofia-form select,
.sofia-form textarea {
  width: 100%;
  padding: 0.7rem 0.95rem;
  border: 1.5px solid var(--slate-200);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  background: #fff;
  color: var(--slate-900);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sofia-form input:focus,
.sofia-form select:focus,
.sofia-form textarea:focus {
  outline: none;
  border-color: var(--indigo-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.sofia-form textarea {
  min-height: 90px;
  resize: vertical;
  font-family: inherit;
}
.sofia-form .hint {
  font-size: 0.82rem;
  color: var(--slate-500);
  margin-top: 0.3rem;
}

/* ============ LAYOUT ============ */
.sofia-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}
.sofia-container-narrow {
  max-width: 540px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* ============ TOAST ============ */
.sofia-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--slate-900);
  color: #fff;
  padding: 0.85rem 1.3rem;
  border-radius: 12px;
  font-size: 0.92rem;
  font-weight: 500;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.25);
  z-index: 100;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  max-width: 360px;
}
.sofia-toast.show {
  transform: translateY(0);
  opacity: 1;
}
.sofia-toast.ok { background: var(--emerald-600); }
.sofia-toast.error { background: var(--rose-600); }

/* ============ HERO (landing) ============ */
.sofia-hero {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  max-width: 880px;
  margin: 0 auto;
}
.sofia-hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, var(--indigo-700), var(--purple-600), var(--pink-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sofia-hero p.lead {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--slate-600);
  line-height: 1.6;
  margin: 0 0 1.8rem;
}
.sofia-hero .hero-emoji {
  font-size: 4rem;
  margin-bottom: 0.5rem;
}

/* ============ MODAL ============ */
.sofia-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 2rem 1rem;
  overflow-y: auto;
}
.sofia-overlay.show { display: flex; animation: fade-in 0.25s ease; }
.sofia-modal {
  background: #fff;
  border-radius: 18px;
  max-width: 540px;
  width: 100%;
  box-shadow: 0 25px 50px rgba(15, 23, 42, 0.3);
  margin: auto;
  animation: slide-up 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.sofia-modal-header {
  padding: 1.3rem 1.6rem;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sofia-modal-header h2 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 800;
}
.sofia-modal-body { padding: 1.3rem 1.6rem; }
.sofia-modal-footer {
  padding: 1rem 1.6rem 1.3rem;
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
}
.close-btn {
  background: var(--slate-100);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.05rem;
  color: var(--slate-600);
  font-weight: 700;
}

@keyframes fade-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes slide-up { from { opacity: 0; transform: translateY(20px) } to { opacity: 1; transform: translateY(0) } }
@keyframes pulse { 0%, 100% { opacity: 1 } 50% { opacity: 0.5 } }
.pulse { animation: pulse 1.5s ease infinite; }

/* ============ UTILITY ============ */
.text-center { text-align: center; }
.text-muted { color: var(--slate-500); font-size: 0.9rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

@media (max-width: 640px) {
  .sofia-topbar { padding: 0.7rem 1rem; }
  .sofia-topbar .nav { gap: 0.5rem; }
  .sofia-topbar .nav a { font-size: 0.82rem; }
  .sofia-container, .sofia-container-narrow { padding: 1rem; }
}