/* Profe Juan — estilos base
   Paleta: navy #14213D | teal #2C7A7B | slate #5A6B7B | paper #F5F7FA
*/

:root {
    --navy: #14213D;
    --teal: #2C7A7B;
    --teal-dark: #1F5B5C;
    --slate: #5A6B7B;
    --paper: #F5F7FA;
    --white: #FFFFFF;
    --ink: #16202B;
    --border: #E2E8EF;

    --serif: 'Source Serif 4', Georgia, serif;
    --sans: 'IBM Plex Sans', -apple-system, Segoe UI, Roboto, sans-serif;
    --max-width: 1080px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--sans);
    color: var(--ink);
    background: var(--paper);
    line-height: 1.55;
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; color: var(--navy); margin: 0 0 0.5em; line-height: 1.2; }
h1 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); }
h2 { font-size: 1.6rem; }
p { margin: 0 0 1em; }
a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

.eyebrow { font-size: 0.9rem; color: var(--teal); font-weight: 500; margin-bottom: 0.5em; }

/* Header */
.site-header { background: var(--navy); }
.header-row { display: flex; align-items: center; justify-content: space-between; height: 68px; flex-wrap: wrap; gap: 8px; }
.brand { font-family: var(--serif); font-size: 1.2rem; font-weight: 700; color: var(--white); }
.main-nav { display: flex; align-items: center; gap: 22px; }
.main-nav a { color: #C9D6E3; font-size: 0.95rem; padding: 4px 2px; border-bottom: 1px solid transparent; }
.main-nav a:hover, .main-nav a.is-active { color: var(--white); border-color: var(--teal); }
.nav-user { color: #C9D6E3; font-size: 0.9rem; }
.btn-link { color: var(--white) !important; border: 1px solid var(--teal); padding: 6px 14px; }

/* Buttons */
.btn { display: inline-block; padding: 12px 24px; font-weight: 500; border: 1px solid transparent; cursor: pointer; font-family: var(--sans); font-size: 0.96rem; }
.btn-primary { background: var(--teal); color: var(--white); }
.btn-primary:hover { background: var(--teal-dark); }
.btn-outline { background: transparent; color: var(--navy); border-color: var(--navy); }

/* Hero (perfil público del docente) */
.hero { background: var(--navy); color: var(--white); padding: 64px 0; }
.hero h1 { color: var(--white); margin-bottom: 0.2em; }
.hero .rol { color: #9FC4C4; font-size: 1.05rem; margin-bottom: 1em; }
.hero .bio { max-width: 640px; color: #C9D6E3; }

.section { padding: 56px 0; }
.section-narrow { max-width: 720px; }

/* Tarjetas de curso */
.cursos-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; margin-top: 1.6em; }
.curso-card { background: var(--white); border: 1px solid var(--border); padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.curso-card h3 { font-size: 1.1rem; margin-bottom: 0; }
.curso-card p { color: var(--slate); font-size: 0.94rem; margin-bottom: 0; flex-grow: 1; }
.badge { align-self: flex-start; font-size: 0.75rem; font-weight: 600; padding: 3px 10px; border-radius: 2px; text-transform: uppercase; letter-spacing: 0.03em; }
.badge-publico { background: #E4F3F2; color: var(--teal-dark); }
.badge-privado { background: #EEF1F5; color: var(--slate); }
.curso-card .ver { color: var(--teal-dark); font-weight: 500; border-bottom: 1px solid var(--teal); width: fit-content; }

/* Formularios */
.form-box { background: var(--white); border: 1px solid var(--border); padding: 32px; max-width: 420px; margin: 0 auto; }
.form-box.wide { max-width: 640px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 0.88rem; font-weight: 500; margin-bottom: 6px; color: var(--navy); }
.field input, .field textarea, .field select {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border); font-family: var(--sans); font-size: 0.95rem; background: var(--paper);
}
.field textarea { resize: vertical; min-height: 90px; }
.alert { padding: 12px 16px; margin-bottom: 18px; font-size: 0.9rem; }
.alert-error { background: #FCEAEA; color: #A5333B; border: 1px solid #F3C6C8; }
.alert-success { background: #E4F3F2; color: var(--teal-dark); border: 1px solid #BFE3E1; }

/* Tablas de administración */
table.admin-table { width: 100%; border-collapse: collapse; margin-top: 1.4em; background: var(--white); }
table.admin-table th, table.admin-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
table.admin-table th { color: var(--slate); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.02em; }

/* Lista de materiales */
.material-list { list-style: none; padding: 0; margin: 1em 0 0; }
.material-list li { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; background: var(--white); border: 1px solid var(--border); margin-bottom: 8px; }
.material-list a.descargar { color: var(--teal-dark); font-weight: 500; }

.site-footer { padding: 24px 0; color: var(--slate); font-size: 0.85rem; border-top: 1px solid var(--border); margin-top: 48px; }

.empty-state { color: var(--slate); font-style: italic; }

@media (max-width: 640px) {
    .header-row { flex-direction: column; align-items: flex-start; padding: 12px 0; height: auto; }
    .main-nav { flex-wrap: wrap; gap: 12px; }
}