/* Portal · Formación en Inteligencia Artificial y Aplicaciones
   Estilo único compartido por todas las páginas del portal. */
:root {
    --bg-color: #0f172a;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-light: #f8fafc;
    --text-dim: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    /* Color de cada bloque de la escalera */
    --b1: #60a5fa;
    --b2: #34d399;
    --b3: #fbbf24;
    --b4: #f472b6;
}
* { box-sizing: border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-light);
    margin: 0; padding: 2rem 0; min-height: 100vh;
    display: flex; justify-content: center; align-items: flex-start;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.15) 0%, transparent 50%);
    background-attachment: fixed;
}
a { color: #93c5fd; }
.app-container { width: 90%; max-width: 1200px; background: var(--glass-bg); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border: 1px solid var(--glass-border); border-radius: 24px; padding: 2.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5); animation: fadeIn 0.8s ease-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px);} to {opacity:1; transform: translateY(0);} }

/* Barra superior */
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 2rem; font-size: 0.92rem; }
.topbar a { text-decoration: none; color: var(--text-dim); }
.topbar a:hover { color: var(--text-light); }
.topbar .brand { color: var(--text-light); font-weight: 700; }

header { text-align: center; margin-bottom: 2.5rem; }
h1 { font-size: 2.4rem; margin: 0; background: linear-gradient(135deg, #60a5fa, #34d399); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; line-height: 1.2; }
.subtitle { color: var(--text-dim); margin-top: 0.6rem; font-size: 1.05rem; line-height: 1.5; }
.byline { color: #93c5fd; margin-top: 0.6rem; font-size: 0.92rem; font-weight: 600; letter-spacing: 0.02em; }

/* Escalera del sello */
.ladder { display: flex; align-items: stretch; gap: 0.6rem; flex-wrap: wrap; margin: 1.8rem 0 2.5rem; }
.ladder-step { flex: 1 1 170px; border-radius: 14px; padding: 1rem 1.1rem; background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border); border-top: 4px solid var(--c); }
.ladder-step strong { display: block; color: var(--c); font-size: 1.1rem; margin-bottom: 0.3rem; }
.ladder-step span { color: var(--text-dim); font-size: 0.92rem; line-height: 1.45; }
.ladder-arrow { align-self: center; color: var(--text-dim); font-size: 1.4rem; }

.section-title { font-size: 1.6rem; color: #fff; margin: 2.4rem 0 1.2rem; border-left: 4px solid var(--primary); padding-left: 1rem; }
.section-title:first-child { margin-top: 0; }
.lead { color: var(--text-dim); line-height: 1.6; margin-bottom: 1.4rem; }

/* Tarjetas de lección */
.block-title { display: flex; align-items: baseline; gap: 0.8rem; margin: 2rem 0 1rem; }
.block-title h3 { margin: 0; font-size: 1.25rem; color: var(--c); }
.block-title span { color: var(--text-dim); font-size: 0.92rem; }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 1.1rem; }
.lesson-card { position: relative; display: block; text-decoration: none; background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border); border-radius: 16px; padding: 1.3rem 1.4rem; transition: transform 0.25s ease, border-color 0.25s ease; color: inherit; }
a.lesson-card:hover { transform: translateY(-4px); border-color: var(--c); }
.lesson-card .num { font-size: 0.82rem; font-weight: 700; color: var(--c); letter-spacing: 0.04em; }
.lesson-card h4 { margin: 0.35rem 0 0.5rem; font-size: 1.08rem; color: var(--text-light); line-height: 1.35; }
.lesson-card p { margin: 0; color: var(--text-dim); font-size: 0.93rem; line-height: 1.5; }
.lesson-card.soon { opacity: 0.55; }
.status { display: inline-block; margin-top: 0.8rem; font-size: 0.78rem; font-weight: 600; border-radius: 999px; padding: 0.15rem 0.7rem; }
.status.on { background: rgba(16,185,129,0.2); color: #6ee7b7; }
.status.off { background: rgba(148,163,184,0.15); color: var(--text-dim); }

/* Componentes reutilizables (lecciones) */
.concept-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 1.3rem; margin-bottom: 2rem; }
.concept-card { background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border); border-radius: 16px; padding: 1.5rem; }
.concept-card h3 { margin-top: 0; color: #60a5fa; font-size: 1.12rem; }
.concept-card p, .concept-card li { color: var(--text-dim); line-height: 1.55; font-size: 0.97rem; }
.concept-card.accent h3 { color: #34d399; }
.concept-card.warning h3 { color: var(--warning); }
.badge { display: inline-block; background: rgba(59,130,246,0.2); color: #93c5fd; border-radius: 999px; padding: 0.2rem 0.9rem; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.7rem; }
.badge.green { background: rgba(16,185,129,0.2); color: #6ee7b7; }
.badge.amber { background: rgba(245,158,11,0.2); color: #fcd34d; }
.table-wrap { overflow-x: auto; margin-bottom: 2rem; border-radius: 14px; border: 1px solid var(--glass-border); }
table { width: 100%; border-collapse: collapse; background: rgba(255,255,255,0.03); font-size: 0.95rem; }
th, td { padding: 0.85rem 1rem; text-align: left; border-bottom: 1px solid var(--glass-border); vertical-align: top; }
th { background: rgba(59,130,246,0.18); color: var(--text-light); font-weight: 600; }
td { color: var(--text-dim); }
td strong { color: var(--text-light); }
tr:last-child td { border-bottom: none; }
.bridge-box { background: linear-gradient(135deg, rgba(59,130,246,0.12), rgba(16,185,129,0.12)); border: 1px solid rgba(96,165,250,0.35); border-radius: 16px; padding: 1.5rem; margin-top: 1rem; }
.bridge-box h3 { margin-top: 0; color: var(--text-light); }
.bridge-box p { color: var(--text-dim); line-height: 1.6; margin-bottom: 0; }
.formula { font-size: 1.1rem; line-height: 1.7; color: var(--text-light); background: rgba(16,185,129,0.1); border: 1px dashed rgba(52,211,153,0.5); border-radius: 14px; padding: 1.2rem 1.4rem; margin: 1rem 0 1.6rem; }
.formula em { color: #6ee7b7; font-style: normal; font-weight: 600; }

/* Pestañas */
.tabs { display: flex; justify-content: center; gap: 0.6rem; margin-bottom: 2rem; border-bottom: 1px solid var(--glass-border); padding-bottom: 1rem; flex-wrap: wrap; }
.tab-btn { background: transparent; border: none; color: var(--text-dim); font-size: 1.02rem; font-weight: 600; cursor: pointer; padding: 0.65rem 1.2rem; border-radius: 8px; transition: all 0.3s ease; font-family: inherit; }
.tab-btn:hover { color: var(--text-light); background: rgba(255,255,255,0.05); }
.tab-btn.active { color: var(--text-light); background: var(--primary); box-shadow: 0 4px 14px 0 rgba(59,130,246,0.39); }
.tab-content { display: none; animation: fadeIn 0.5s ease-out; }
.tab-content.active { display: block; }

/* Chequeo con retroalimentación */
.question-card { background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border); border-radius: 16px; padding: 1.5rem; margin-bottom: 1.3rem; }
.question-card h3 { margin-top: 0; font-size: 1.08rem; line-height: 1.5; }
.option { display: block; background: rgba(255,255,255,0.04); border: 1px solid var(--glass-border); border-radius: 10px; padding: 0.8rem 1.1rem; margin-bottom: 0.6rem; cursor: pointer; color: var(--text-dim); transition: all 0.2s ease; line-height: 1.4; }
.option:hover { border-color: var(--primary); color: var(--text-light); }
.option.correct { border-color: var(--accent); background: rgba(16,185,129,0.15); color: var(--text-light); }
.option.incorrect { border-color: var(--danger); background: rgba(239,68,68,0.15); color: var(--text-light); }
.options.locked .option { cursor: default; }
.feedback { display: none; margin-top: 0.8rem; padding: 0.9rem 1.1rem; border-radius: 10px; font-size: 0.93rem; line-height: 1.55; }
.feedback.show { display: block; }
.feedback.ok { background: rgba(16,185,129,0.12); color: #6ee7b7; }
.feedback.fail { background: rgba(239,68,68,0.12); color: #fca5a5; }
.feedback strong { color: var(--text-light); }

/* Prompt con botón copiar */
.prompt-box { position: relative; background: rgba(0,0,0,0.3); border: 1px solid var(--glass-border); border-left: 4px solid var(--accent); border-radius: 12px; padding: 1.1rem 1.2rem 1.1rem; margin: 0.8rem 0 1.4rem; }
.prompt-box pre { margin: 0; white-space: pre-wrap; word-wrap: break-word; font-family: 'Consolas', 'SFMono-Regular', monospace; font-size: 0.88rem; line-height: 1.55; color: #e2e8f0; }
.copy-btn { position: absolute; top: 0.6rem; right: 0.6rem; background: var(--primary); color: #fff; border: none; border-radius: 8px; padding: 0.35rem 0.8rem; font-size: 0.82rem; font-weight: 600; cursor: pointer; font-family: inherit; }
.copy-btn:hover { background: var(--primary-hover); }
.btn-primary { background: var(--primary); color: #fff; border: none; border-radius: 10px; padding: 0.7rem 1.4rem; font-size: 0.95rem; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; }
.btn-primary:hover { background: var(--primary-hover); }

.meta-line { color: var(--text-dim); font-size: 0.85rem; margin-top: 0.4rem; }
footer { text-align: center; color: var(--text-dim); font-size: 0.85rem; margin-top: 2.8rem; line-height: 1.6; }
footer a { text-decoration: none; }

@media (max-width: 640px) {
    body { padding: 1rem 0; }
    .app-container { padding: 1.3rem; width: calc(100% - 32px); border-radius: 18px; }
    h1 { font-size: 1.75rem; }
    .ladder-arrow { display: none; }
    .section-title { font-size: 1.35rem; }
}

/* Formularios (contacto y solicitud de servicio) */
.form { display: flex; flex-direction: column; gap: 1rem; max-width: 760px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 1rem; }
.form label { display: flex; flex-direction: column; gap: 0.4rem; color: var(--text-light); font-size: 0.95rem; font-weight: 600; }
.form input[type=text], .form input[type=email], .form select, .form textarea {
    background: rgba(0,0,0,0.3); border: 1px solid var(--glass-border); border-radius: 10px;
    padding: 0.7rem 0.9rem; color: var(--text-light); font-size: 0.97rem; font-family: inherit; font-weight: 400;
}
.form select option { background: #1e293b; }
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--primary); border-color: transparent; }
.form label.check { flex-direction: row; align-items: flex-start; gap: 0.6rem; font-weight: 400; color: var(--text-dim); line-height: 1.5; }
.form label.check input { margin-top: 0.25rem; width: 1.1rem; height: 1.1rem; accent-color: var(--accent); flex-shrink: 0; }
.form .btn-primary { align-self: flex-start; font-family: inherit; }
.aviso-datos { color: #fcd34d; font-size: 0.88rem; margin: 0; }
.oculto { position: absolute; left: -9999px; }
.legal p { color: var(--text-dim); line-height: 1.7; }
.legal .section-title { font-size: 1.2rem; }

/* Tarjetas apiladas fuera de una grilla (pasos de práctica) */
.tab-content > .concept-card, .agenda-list > .concept-card { margin-bottom: 1.1rem; }
h3 { line-height: 1.35; }
/* Espacio para que el botón Copiar no tape el texto del prompt */
.prompt-box { padding-top: 2.7rem; }
.concept-card.danger h3 { color: #f87171; }

/* Evaluación de la lección */
.eval-card { max-width: 760px; }
.eval-meta { color: var(--text-dim); font-size: 0.9rem; margin: 0.3rem 0 0.9rem; }
.eval-label { display: block; font-weight: 600; margin: 0.6rem 0 0.4rem; }
.eval-input { width: 100%; background: rgba(15,23,42,0.6); border: 1px solid var(--glass-border); border-radius: 10px; padding: 0.75rem 0.9rem; color: var(--text-light); font-size: 1rem; font-family: inherit; }
.eval-input:focus { outline: 2px solid var(--primary); border-color: transparent; }
.eval-btn { margin-top: 1rem; font-family: inherit; }
.eval-oculto { display: none; }
.eval-sec { background: transparent; color: var(--text-light); border: 1px solid var(--glass-border); border-radius: 10px; padding: 0.7rem 1.4rem; font-size: 0.95rem; font-weight: 600; cursor: pointer; }
.eval-sec:hover { border-color: var(--primary); }
.eval-acciones { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.eval-progreso { height: 6px; border-radius: 3px; background: rgba(255,255,255,0.08); overflow: hidden; margin-bottom: 0.6rem; }
.eval-progreso i { display: block; height: 100%; background: var(--primary); transition: width 0.3s ease; }
.eval-puntaje { font-size: 2.4rem; font-weight: 700; margin: 0.4rem 0 0.9rem; }
.eval-puntaje span { font-size: 1.2rem; color: var(--text-dim); font-weight: 600; }
.eval-sub { margin: 1.2rem 0 0.6rem; font-size: 1rem; }
.eval-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.eval-chips span { background: rgba(245,158,11,0.12); color: #fcd34d; border: 1px solid rgba(245,158,11,0.3); border-radius: 999px; padding: 0.3rem 0.8rem; font-size: 0.88rem; }