/*
========================================================================
   PORTAFOLIO ACADÉMICO MULTIMODAL - GRUPO 3
   Diseño institucional premium (Universidad Autónoma del Perú)
========================================================================
*/

:root {
    /* Paleta */
    --color-bg-light: #f7f8fb;
    --color-bg-card: #ffffff;
    --color-white: #ffffff;

    --color-navy: #0f172a;
    --color-navy-light: #1e293b;
    --color-text-main: #334155;
    --color-text-muted: #64748b;
    --color-text-soft: #94a3b8;

    /* Acentos institucionales */
    --color-primary: #8a1538;       /* Guinda UAP */
    --color-primary-dark: #6d102c;
    --color-accent: #d4af37;        /* Dorado UAP */
    --color-accent-soft: #f4e4a6;

    /* Bordes y sombras */
    --color-border: #e2e8f0;
    --color-border-soft: #eef1f5;
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 10px 24px -8px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, 0.18);
    --shadow-xl: 0 32px 64px -16px rgba(15, 23, 42, 0.25);

    --font-main: "Inter", "Segoe UI", Roboto, sans-serif;
    --max-width: 1200px;
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
    font-family: var(--font-main);
    color: var(--color-text-main);
    background-color: var(--color-bg-light);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }

/* ========================================================================
   REVEAL ANIMATIONS (IntersectionObserver-driven)
   ======================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
    will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
    html { scroll-behavior: auto; }
}

/* Modo Edición Highlights */
[contenteditable="true"] {
    outline: 2px dashed rgba(138, 21, 56, 0.45);
    outline-offset: 4px;
    border-radius: 4px;
    transition: all 0.2s;
}
[contenteditable="true"]:focus {
    outline: 2px solid var(--color-primary);
    background-color: rgba(255, 255, 255, 0.7);
}

/* ========================================================================
   BOTONES Y UI
   ======================================================================== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 28px; border-radius: var(--radius-xs); font-weight: 600;
    text-decoration: none; transition: all var(--transition); cursor: pointer;
    border: none; font-size: 0.98rem; font-family: var(--font-main);
}
.btn svg { transition: transform var(--transition); }
.btn-primary {
    background-color: var(--color-primary); color: var(--color-white);
    box-shadow: 0 6px 16px -4px rgba(138, 21, 56, 0.3);
}
.btn-primary:hover {
    background-color: var(--color-primary-dark); transform: translateY(-2px);
    box-shadow: 0 12px 24px -6px rgba(138, 21, 56, 0.4);
}
.btn-primary:hover svg { transform: translate(2px, -2px); }

.floating-btn {
    position: fixed; bottom: 30px; right: 30px; z-index: 9999;
    display: flex; align-items: center; gap: 8px;
    padding: 12px 20px; border-radius: 50px; border: none;
    font-weight: 600; color: var(--color-white); cursor: pointer; font-family: var(--font-main);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2); transition: all var(--transition);
}
.floating-btn:hover { transform: translateY(-3px) scale(1.02); }
.floating-btn .icon { width: 20px; height: 20px; }
.edit-btn { background: var(--color-navy); bottom: 30px !important; left: 24px !important; right: auto !important; }
.save-btn { background: #10b981; bottom: 30px !important; left: 24px !important; right: auto !important; }
.hidden { display: none !important; }

/* Back to Top — eliminado, reemplazado por botón Gracias */

/* ========================================================================
   NAVEGACIÓN
   ======================================================================== */
.main-nav {
    position: fixed; top: 0; left: 0; width: 100%; height: 72px;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.25);
    z-index: 1000; box-shadow: 0 4px 20px -8px rgba(0,0,0,0.3);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.nav-brand {
    font-weight: 700; font-size: 1rem; color: var(--color-white); text-decoration: none;
    display: flex; align-items: center; gap: 10px; letter-spacing: 0.2px;
}
.nav-brand em { color: var(--color-accent); font-style: normal; margin: 0 4px; }
.nav-brand svg { color: var(--color-accent); }
.nav-links { list-style: none; display: flex; gap: 28px; }
.nav-links a {
    text-decoration: none; color: #cbd5e1;
    font-weight: 500; font-size: 0.92rem; transition: color var(--transition-fast);
    position: relative; padding: 4px 0;
}
.nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px;
    background: var(--color-accent); transform: scaleX(0); transform-origin: center;
    transition: transform var(--transition);
}
.nav-links a:hover { color: var(--color-accent); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-toggle { display: none; flex-direction: column; justify-content: space-between; width: 26px; height: 18px; background: transparent; border: none; cursor: pointer; }
.nav-toggle span { width: 100%; height: 2px; background-color: var(--color-white); border-radius: 2px; transition: all 0.3s; }

/* Scroll progress bar (creada por JS) */
.nav-progress {
    position: fixed; top: 72px; left: 0; height: 5px; width: 0%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 1001; transition: width 0.1s linear;
}

/* ========================================================================
   HERO INSTITUCIONAL
   ======================================================================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #f7f8fb 0%, #ffffff 50%, #f1f4f9 100%);
    padding: 140px 0 110px;
    overflow: hidden;
    border-bottom: 1px solid var(--color-border);
}
.hero-bg-deco {
    position: absolute; top: -100px; right: -100px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.08) 0%, transparent 70%);
    border-radius: 50%; pointer-events: none;
}
.hero-bg-deco::after {
    content: ''; position: absolute; bottom: -300px; left: -200px;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(138, 21, 56, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-layout {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}
.hero-content { z-index: 2; }

.hero-badge {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 8px 16px; margin-bottom: 28px;
    background: var(--color-white); border: 1px solid var(--color-border);
    border-radius: 50px; font-size: 0.82rem; font-weight: 600;
    color: var(--color-navy); letter-spacing: 0.3px;
    box-shadow: var(--shadow-xs);
}
.badge-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.2);
    animation: pulse-dot 2.5s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.2); }
    50% { box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.1); }
}

.hero-logo-container {
    max-width: 280px; margin-bottom: 24px; position: relative;
}
.hero-logo-img { width: 100%; height: auto; object-fit: contain; }

.hero-title {
    font-size: clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 800; line-height: 1.1; margin-bottom: 22px;
    letter-spacing: -1.2px; color: var(--color-navy);
}
.hero-subtitle {
    font-size: 1.15rem; color: var(--color-text-muted);
    margin-bottom: 36px; line-height: 1.65; max-width: 540px;
}
.hero-subtitle strong { color: var(--color-primary); font-weight: 700; }

.hero-metadata {
    display: flex; gap: 28px; margin-bottom: 36px;
    border-left: 3px solid var(--color-accent); padding-left: 18px;
    flex-wrap: wrap;
}
.meta-item { font-size: 0.95rem; color: var(--color-text-main); }
.meta-item strong {
    color: var(--color-navy); display: block; font-size: 0.72rem;
    text-transform: uppercase; letter-spacing: 1.2px; margin-bottom: 4px;
    font-weight: 700;
}

/* hero-stats, stat-pill, stat-divider — eliminados, no se usan en el HTML */

/* Hero Visual */
.hero-visual-wrap {
    position: relative;
}
.hero-visual {
    width: 100%; aspect-ratio: 4/5;
    border-radius: var(--radius-lg);
    overflow: hidden; box-shadow: var(--shadow-xl);
    position: relative; background: #e2e8f0; z-index: 2;
}
.hero-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--transition); }
.hero-visual:hover .hero-img { transform: scale(1.04); }
.hero-visual-accent {
    position: absolute; top: 24px; right: -24px;
    width: 100%; height: 100%; max-height: 100%;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-lg);
    z-index: 1;
    aspect-ratio: 4/5;
}
.hero-visual-tag {
    position: absolute; bottom: 20px; left: -20px;
    background: var(--color-navy); color: var(--color-white);
    padding: 10px 18px; border-radius: 50px;
    font-size: 0.82rem; font-weight: 600; letter-spacing: 0.3px;
    display: flex; align-items: center; gap: 10px;
    box-shadow: var(--shadow-md); z-index: 3;
}
.hero-visual-tag .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--color-accent);
    animation: pulse-dot 2.5s ease-in-out infinite;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    text-decoration: none; color: var(--color-text-muted);
    font-size: 0.72rem; text-transform: uppercase; letter-spacing: 2px;
    font-weight: 600; transition: color var(--transition);
    z-index: 5;
}
.scroll-indicator:hover { color: var(--color-primary); }
.scroll-mouse {
    width: 24px; height: 38px; border: 2px solid currentColor;
    border-radius: 13px; position: relative; opacity: 0.6;
}
.scroll-wheel {
    position: absolute; top: 6px; left: 50%; width: 3px; height: 8px;
    background: var(--color-primary); border-radius: 2px;
    transform: translateX(-50%);
    animation: scroll-bounce 1.8s ease-in-out infinite;
}
@keyframes scroll-bounce {
    0%, 100% { opacity: 0; transform: translate(-50%, 0); }
    50% { opacity: 1; transform: translate(-50%, 10px); }
}

/* ========================================================================
   SECCIONES COMUNES
   ======================================================================== */
.section { padding: 120px 0; position: relative; }
.section-alt {
    background-color: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.section-header { margin-bottom: 64px; max-width: 720px; margin-left: auto; margin-right: auto; }
.section-eyebrow {
    display: inline-block; padding: 6px 14px; margin-bottom: 16px;
    background: rgba(138, 21, 56, 0.08); color: var(--color-primary);
    border-radius: 50px; font-size: 0.75rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 1.5px;
}
.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    color: var(--color-navy); font-weight: 800;
    letter-spacing: -0.5px; margin-bottom: 16px; line-height: 1.2;
}
.section-lead {
    font-size: 1.1rem; color: var(--color-text-muted);
    line-height: 1.6; max-width: 620px; margin: 0 auto;
}

/* ========================================================================
   AUTORES
   ======================================================================== */
.authors-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px;
    max-width: 1000px; margin: 0 auto;
}
.author-card {
    background: var(--color-white); border-radius: var(--radius-md); overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-border);
    padding: 16px 16px 4px 16px;
    position: relative;
}
.author-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0); transform-origin: left;
    transition: transform var(--transition);
}
.author-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}
.author-card:hover::before { transform: scaleX(1); }

.author-photo {
    width: 100%; aspect-ratio: 3 / 4;
    position: relative; background: #e2e8f0;
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.photo-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--transition); }
.author-card:hover .photo-img { transform: scale(1.05); }

.author-info { padding: 20px 0 16px 0; text-align: center; background: transparent; }
.author-name {
    font-size: 1.05rem; font-weight: 700; color: var(--color-navy);
    margin-bottom: 6px; line-height: 1.3;
}
.author-role {
    font-size: 0.85rem; color: var(--color-primary); font-weight: 600;
    display: block; margin-bottom: 12px; letter-spacing: 0.3px;
}
.role-line {
    width: 32px; height: 2px;
    background: var(--color-accent); margin: 0 auto;
    transition: width var(--transition);
}
.author-card:hover .role-line { width: 60px; }

/* Upload Overlay */
.uploader { cursor: default; position: relative; }
.uploader.editing { cursor: pointer; }
.upload-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.75); color: white;
    display: flex; justify-content: center; align-items: center;
    font-weight: 600; opacity: 0; transition: opacity 0.25s;
    z-index: 10; font-size: 0.9rem;
}
.uploader.editing:hover .upload-overlay { opacity: 1; }

/* ========================================================================
   PROBLEMÁTICA — Stats + Statement
   ======================================================================== */
.problem-stats {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    margin-bottom: 60px;
}
.stat-block {
    background: var(--color-white); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); padding: 36px 28px;
    text-align: center; position: relative; overflow: hidden;
    transition: all var(--transition);
}
.stat-block::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--color-border);
    transition: background var(--transition);
}
.stat-block:hover {
    transform: translateY(-4px); box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}
.stat-block:hover::before { background: var(--color-accent); }
.stat-block-accent { background: var(--color-navy); border-color: var(--color-navy); }
.stat-block-accent::before { background: var(--color-accent); }
.stat-block-accent:hover { transform: translateY(-4px); }
.stat-block-accent .stat-number { color: var(--color-accent); }
.stat-block-accent .stat-label { color: var(--color-white); }
.stat-block-accent .stat-source { color: var(--color-text-soft); }

.stat-number {
    font-size: clamp(2.8rem, 5vw, 3.6rem);
    font-weight: 800; color: var(--color-primary); line-height: 1;
    margin-bottom: 16px; letter-spacing: -2px;
}
.stat-label {
    font-size: 1rem; color: var(--color-navy);
    font-weight: 600; line-height: 1.5; margin-bottom: 12px;
}
.stat-source {
    font-size: 0.78rem; color: var(--color-text-muted);
    text-transform: uppercase; letter-spacing: 1px; font-weight: 600;
}

.problem-layout {
    display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px;
    align-items: center;
    background: var(--color-bg-card); padding: 48px;
    border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}
.problem-statement-box {
    font-size: 1.25rem; font-weight: 600; color: var(--color-navy); line-height: 1.6;
    display: flex; gap: 24px; align-items: flex-start;
}
.problem-statement-box p { font-style: italic; }
.problem-icon {
    flex-shrink: 0; width: 48px; height: 48px; border-radius: 50%;
    background: var(--color-primary); color: var(--color-white);
    display: flex; align-items: center; justify-content: center; padding: 12px;
    box-shadow: 0 8px 16px -4px rgba(138, 21, 56, 0.4);
}
.problem-chips {
    display: flex; flex-direction: column; gap: 14px;
}
.chip {
    background: var(--color-bg-light); border: 1px solid var(--color-border);
    padding: 18px 22px; border-radius: var(--radius-md);
    display: flex; align-items: center; gap: 14px;
    box-shadow: var(--shadow-xs); font-weight: 600; color: var(--color-navy);
    transition: all var(--transition);
}
.chip:hover {
    background: var(--color-white); border-color: var(--color-primary);
    transform: translateX(4px);
}
.chip-icon {
    width: 22px; height: 22px; color: var(--color-primary); flex-shrink: 0;
}

/* ========================================================================
   RUTA DEL TRABAJO — Timeline
   ======================================================================== */
.timeline-horizontal {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    position: relative;
}
.timeline-line {
    position: absolute; top: 26px; left: 12.5%; right: 12.5%; height: 2px;
    background: linear-gradient(90deg,
        var(--color-primary) 0%,
        var(--color-accent) 50%,
        var(--color-primary) 100%);
    opacity: 0.3; z-index: 0;
}
.timeline-item {
    position: relative; text-align: center; z-index: 1;
}
.timeline-marker {
    width: 54px; height: 54px; margin: 0 auto 16px;
    background: var(--color-white); border: 2px solid var(--color-primary);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-weight: 800; color: var(--color-primary); font-size: 1.05rem;
    box-shadow: 0 4px 12px -2px rgba(138, 21, 56, 0.2);
    transition: all var(--transition);
}
.timeline-item:hover .timeline-marker {
    background: var(--color-primary); color: var(--color-white);
    transform: scale(1.08);
}
.timeline-date {
    font-size: 0.78rem; color: var(--color-primary); font-weight: 700;
    text-transform: uppercase; letter-spacing: 1.2px; margin-bottom: 14px;
}
.timeline-content {
    background: var(--color-white); border: 1px solid var(--color-border);
    padding: 28px 22px; border-radius: var(--radius-md); box-shadow: var(--shadow-xs);
    transition: all var(--transition);
}
.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-md); transform: translateY(-4px);
    border-color: var(--color-accent);
}
.timeline-icon { font-size: 1.8rem; margin-bottom: 12px; }
.timeline-title {
    font-size: 1.05rem; color: var(--color-navy);
    font-weight: 700; line-height: 1.4; margin-bottom: 10px;
}
.timeline-desc {
    font-size: 0.88rem; color: var(--color-text-muted);
    line-height: 1.5;
}

/* ========================================================================
   EVIDENCIAS
   ======================================================================== */
.evidence-stack { display: flex; flex-direction: column; gap: 56px; }
.evidence-row {
    display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px;
    background: var(--color-white); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-xs);
    align-items: center;
    transition: all var(--transition);
}
.evidence-row:hover {
    box-shadow: var(--shadow-md); border-color: var(--color-border);
}
.evidence-row-reverse .evidence-content { order: 2; }
.evidence-row-reverse .evidence-visual { order: 1; }

.evidence-content { display: flex; flex-direction: column; align-items: flex-start; }
.evidence-meta {
    display: flex; align-items: center; gap: 18px; margin-bottom: 18px;
    flex-wrap: wrap;
}
.evidence-number {
    font-size: 2.6rem; font-weight: 800; color: var(--color-border);
    line-height: 1; letter-spacing: -2px;
}

.evi-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 50px;
    font-size: 0.78rem; font-weight: 700; letter-spacing: 0.3px;
}
.evi-badge-video { background: rgba(220, 38, 38, 0.08); color: #dc2626; }
.evi-badge-pdf { background: rgba(138, 21, 56, 0.08); color: var(--color-primary); }
.evi-badge-audio { background: rgba(212, 175, 55, 0.15); color: #a17c0e; }

.evidence-title {
    font-size: clamp(1.5rem, 2.5vw, 1.9rem);
    color: var(--color-navy); margin-bottom: 16px;
    font-weight: 800; letter-spacing: -0.5px; line-height: 1.25;
}
.evidence-desc {
    font-size: 1.05rem; color: var(--color-text-main);
    margin-bottom: 28px; line-height: 1.7;
}
.evidence-note {
    font-size: 0.82rem; color: var(--color-text-muted);
    margin-top: 12px; font-style: italic;
}

.evidence-visual {
    width: 100%; border-radius: var(--radius-md); overflow: hidden;
    box-shadow: var(--shadow-md); background: #e2e8f0; position: relative;
}
.video-embed { position: relative; padding-bottom: 56.25%; height: 0; }
.video-embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.evidence-mockup { aspect-ratio: 4 / 3; }
.mockup-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--transition); }
.evidence-row:hover .mockup-img { transform: scale(1.04); }

/* Podcast */
.podcast-player { width: 100%; margin-bottom: 8px; }
.podcast-player audio {
    width: 100%; border-radius: 50px; outline: none;
}
.podcast-visual {
    aspect-ratio: 1 / 1; max-width: 380px; margin: 0 auto; display: block;
    border-radius: var(--radius-lg); position: relative;
}
.podcast-overlay-text {
    position: absolute; bottom: 20px; left: 20px; right: 20px;
    text-align: center; background: rgba(15, 23, 42, 0.88); color: var(--color-accent);
    padding: 12px; font-weight: 800; letter-spacing: 2.5px; border-radius: 8px;
    backdrop-filter: blur(4px); font-size: 0.95rem;
}

/* ========================================================================
   REFLEXIÓN FINAL
   ======================================================================== */
.reflection-stack { display: flex; flex-direction: column; gap: 36px; max-width: 920px; margin: 0 auto; }
.reflection-row {
    display: flex; gap: 32px; background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 40px;
    box-shadow: var(--shadow-xs);
    transition: all var(--transition);
    position: relative; overflow: hidden;
}
.reflection-row:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}
.reflection-number {
    font-size: 2.4rem; font-weight: 800; color: var(--color-primary); line-height: 1;
    flex-shrink: 0;
}
.reflection-content { flex-grow: 1; min-width: 0; }
.reflection-header {
    display: flex; align-items: center; gap: 16px; margin-bottom: 22px;
    border-bottom: 2px solid var(--color-bg-light); padding-bottom: 18px;
}
.reflection-header h3 {
    font-size: 1.6rem; color: var(--color-navy); font-weight: 800;
    letter-spacing: -0.3px;
}
.reflection-icon { font-size: 1.8rem; }
.reflection-subtitle {
    font-size: 1.05rem; color: var(--color-text-muted);
    margin-bottom: 22px; font-weight: 600;
}

/* 3.1 Síntesis */
.reflection-list { list-style: none; }
.reflection-list li {
    position: relative; padding-left: 32px; margin-bottom: 14px;
    font-size: 1.02rem; color: var(--color-text-main); line-height: 1.6;
}
.reflection-list li::before {
    content: '✓'; position: absolute; left: 0; top: 2px;
    color: var(--color-accent); font-weight: bold; font-size: 1.15rem;
}

/* 3.2 Autoevaluación */
.eval-split { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.eval-box {
    background: var(--color-bg-light); padding: 26px;
    border-radius: var(--radius-md); border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.eval-box:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.eval-box h4 {
    font-size: 1.05rem; color: var(--color-navy); margin-bottom: 16px;
    font-weight: 700;
}
.eval-box ul { list-style: none; }
.eval-box li {
    position: relative; padding-left: 22px; margin-bottom: 10px;
    font-size: 0.98rem; line-height: 1.5;
}
.eval-strengths h4 { color: #10b981; }
.eval-strengths li::before {
    content: '■'; position: absolute; left: 0; color: #10b981;
    font-size: 0.7rem; top: 6px;
}
.eval-weaknesses h4 { color: var(--color-primary); }
.eval-weaknesses li::before {
    content: '■'; position: absolute; left: 0; color: var(--color-primary);
    font-size: 0.7rem; top: 6px;
}

/* 3.3 Transferencia */
.transfer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.transfer-item {
    text-align: center; padding: 20px 14px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.transfer-item:hover { background: var(--color-bg-light); transform: translateY(-2px); }
.transfer-icon { font-size: 2.2rem; margin-bottom: 14px; }
.transfer-item p { font-size: 0.95rem; line-height: 1.6; }

/* 3.4 Mensaje Final */
.reflection-highlight {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: var(--color-white); border: none;
    box-shadow: var(--shadow-lg);
}
.reflection-pattern {
    position: absolute; inset: 0; pointer-events: none; opacity: 0.4;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(212, 175, 55, 0.15) 1px, transparent 0);
    background-size: 20px 20px;
}
.reflection-highlight > * { position: relative; z-index: 1; }
.reflection-highlight:hover { transform: none; border: none; }
.reflection-highlight .reflection-header h3 {
    color: var(--color-white);
    border-color: rgba(255,255,255,0.1);
}
.reflection-highlight .reflection-number { color: var(--color-accent); }
.final-quote {
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    font-style: italic; color: var(--color-accent);
    font-weight: 700; line-height: 1.5; margin-bottom: 24px;
    padding-left: 24px; border-left: 3px solid var(--color-accent);
}
.final-ack {
    font-size: 1.02rem; color: #cbd5e1; line-height: 1.7;
}

/* ========================================================================
   REFERENCIAS
   ======================================================================== */
.references-box {
    max-width: 920px; margin: 0 auto; background: var(--color-white);
    padding: 48px; border-radius: var(--radius-lg);
    border: 1px solid var(--color-border); box-shadow: var(--shadow-xs);
}
.ref-icon {
    width: 44px; height: 44px; color: var(--color-text-muted);
    margin: 0 auto 28px; opacity: 0.5;
}
.apa-reference {
    padding-left: 2.5rem; text-indent: -2.5rem; margin-bottom: 20px;
    font-size: 0.98rem; line-height: 1.65; color: var(--color-text-main);
}
.apa-reference em { color: var(--color-navy); font-weight: 500; }
.apa-reference a {
    color: var(--color-primary); text-decoration: none;
    word-break: break-all; font-weight: 600;
}
.apa-reference a:hover { text-decoration: underline; }

/* ========================================================================
   FOOTER
   ======================================================================== */
.main-footer {
    background: var(--color-navy);
    color: #cbd5e1;
}
.footer-grid {
    display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px;
    padding: 60px 24px 40px;
}
.footer-col h4 {
    color: var(--color-accent); font-size: 0.78rem;
    text-transform: uppercase; letter-spacing: 1.5px;
    margin-bottom: 14px; font-weight: 700;
}
.footer-col p {
    font-size: 0.9rem; color: #94a3b8; line-height: 1.6;
    margin-bottom: 6px;
}
.footer-brand .footer-logo {
    display: flex; align-items: center; gap: 10px;
    color: var(--color-white); font-weight: 700; font-size: 1rem;
    margin-bottom: 16px;
}
.footer-brand .footer-logo svg { color: var(--color-accent); }
.footer-brand p { font-size: 0.9rem; max-width: 280px; }

.footer-bottom {
    border-top: 1px solid rgba(212, 175, 55, 0.15);
    padding: 24px 0; text-align: center;
}
.footer-bottom p {
    font-size: 0.82rem; color: var(--color-text-soft);
    letter-spacing: 0.3px;
}

/* ========================================================================
   MODALES (PDF)
   ======================================================================== */
.modal-backdrop {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.78); backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 10000; opacity: 0; visibility: hidden; transition: all 0.3s;
}
.modal-backdrop.active { opacity: 1; visibility: visible; }
.modal {
    position: fixed; top: 50%; left: 50%;
    transform: translate(-50%, -45%) scale(0.95);
    background: var(--color-bg-light);
    width: 95%; max-width: 1000px; max-height: 95vh;
    border-radius: var(--radius-lg); z-index: 10001;
    opacity: 0; visibility: hidden; transition: all 0.3s;
    overflow: hidden; display: flex; flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6);
}
.modal.active { transform: translate(-50%, -50%) scale(1); opacity: 1; visibility: visible; }
.modal-close {
    position: absolute; top: 16px; right: 24px;
    background: rgba(0,0,0,0.05); border: none; font-size: 2rem;
    color: var(--color-text-muted); cursor: pointer; z-index: 2;
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s;
}
.modal-close:hover { background: rgba(0,0,0,0.1); color: var(--color-navy); }
.modal-content { padding: 32px; padding-top: 48px; overflow-y: auto; display: flex; flex-direction: column; }
.modal-title {
    font-size: 1.4rem; color: var(--color-navy);
    margin-bottom: 24px; font-weight: 700;
}
.modal-pdf iframe {
    width: 100%; height: 75vh;
    border: 1px solid var(--color-border); border-radius: var(--radius-sm);
    background: var(--color-white);
}

/* ========================================================================
   RESPONSIVE
   ======================================================================== */
@media (max-width: 1024px) {
    .section { padding: 90px 0; }
    .hero { padding: 130px 0 90px; }
    .hero-layout { grid-template-columns: 1fr; gap: 50px; }
    .hero-visual-wrap { max-width: 480px; margin: 0 auto; }
    .hero-visual { aspect-ratio: 4/3; }
    .hero-visual-accent { aspect-ratio: 4/3; }

    .authors-grid { grid-template-columns: repeat(2, 1fr); }

    .timeline-line { display: none; }
    .timeline-horizontal { grid-template-columns: 1fr; gap: 28px; }
    .timeline-item { display: grid; grid-template-columns: auto 80px 1fr; gap: 20px; align-items: center; text-align: left; }
    .timeline-marker { margin: 0; flex-shrink: 0; }
    .timeline-date { margin-bottom: 0; }
    .timeline-content { flex-grow: 1; }

    .problem-stats { grid-template-columns: 1fr; }
    .problem-layout { grid-template-columns: 1fr; padding: 36px; }

    .evidence-row,
    .evidence-row-reverse {
        grid-template-columns: 1fr; gap: 32px; padding: 36px;
    }
    .evidence-row-reverse .evidence-content { order: 2; }
    .evidence-row-reverse .evidence-visual { order: 1; }

    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .section { padding: 70px 0; }
    .section-header { margin-bottom: 44px; }

    .hero { padding: 110px 0 70px; }
    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1.02rem; }
    .hero-metadata { flex-direction: column; gap: 14px; }
    /* hero-stats y stat-divider eliminados */
    .scroll-indicator { display: none; }
    .hero-visual-accent { display: none; }
    .hero-visual-tag { left: 10px; bottom: 10px; font-size: 0.75rem; padding: 8px 14px; }

    .nav-toggle { display: flex; }
    .nav-links {
        display: none; flex-direction: column; position: absolute;
        top: 72px; left: 0; width: 100%;
        background: var(--color-navy); padding: 24px 0; text-align: center;
        gap: 18px;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.3);
    }
    .nav-links.active { display: flex; }

    .authors-grid { grid-template-columns: repeat(4, 1fr); gap: 6px; }
    .author-card { padding: 8px 6px 2px 6px; }
    .author-info { padding: 8px 0 8px 0; }
    .author-name { font-size: 0.7rem; }
    .author-role { font-size: 0.6rem; margin-bottom: 6px; }
    .role-line { display: none; }
    .problem-statement-box { flex-direction: column; font-size: 1.1rem; }

    .timeline-item { grid-template-columns: auto 1fr; gap: 14px; }
    .timeline-date { grid-column: 1 / -1; }
    .timeline-content { grid-column: 1 / -1; }

    .evidence-row, .evidence-row-reverse { padding: 28px; gap: 24px; }
    .evidence-meta { gap: 12px; }
    .evidence-number { font-size: 2rem; }
    .evidence-title { font-size: 1.4rem; }
    .evidence-desc { font-size: 0.98rem; }

    .reflection-row { flex-direction: column; gap: 18px; padding: 28px; }
    .reflection-number { font-size: 2rem; }
    .reflection-header h3 { font-size: 1.3rem; }
    .eval-split, .transfer-grid { grid-template-columns: 1fr; gap: 16px; }
    .final-quote { font-size: 1.15rem; padding-left: 18px; }

    .references-box { padding: 32px 24px; }
    .apa-reference { font-size: 0.92rem; padding-left: 1.8rem; text-indent: -1.8rem; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 48px 24px 32px; text-align: center; }
    .footer-brand .footer-logo { justify-content: center; }
    .footer-brand p { margin: 0 auto; }

    .modal-pdf iframe { height: 70vh; }

    .floating-btn { bottom: 20px; right: 20px; padding: 10px 16px; font-size: 0.9rem; }
    /* back-to-top eliminado */
}

/* ========================================================================
   MEJORAS PARA PRESENTACIÓN — Modal Bienvenida, Gracias, QR, Saltar a, Indicador
   ======================================================================== */

/* --- Overlay de Bienvenida (independiente, no usa clase .modal) --- */
.welcome-overlay {
    position: fixed; inset: 0; z-index: 10000;
    background: rgba(15, 23, 42, 0.88);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: all 0.4s var(--transition);
}
.welcome-overlay.open { opacity: 1; visibility: visible; }

.welcome-box {
    width: 420px;
    max-width: 85vw;
    text-align: center;
    padding: 40px 32px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border);
}
.welcome-logo { max-width: 160px; margin-bottom: 12px; }
.welcome-badge {
    display: inline-block; padding: 4px 14px;
    background: var(--color-primary); color: white;
    border-radius: 50px; font-size: 0.8rem; font-weight: 700;
    letter-spacing: 1px; margin-bottom: 16px;
}
.welcome-title {
    font-size: 1.6rem; color: var(--color-navy);
    font-weight: 800; margin-bottom: 10px; line-height: 1.3;
}
.welcome-sub { color: var(--color-text-muted); margin-bottom: 24px; font-size: 1rem; line-height: 1.5; }
.welcome-authors {
    display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
    margin-bottom: 20px;
}
.welcome-author {
    background: var(--color-bg-light); padding: 6px 14px;
    border-radius: 6px; font-size: 0.85rem; font-weight: 500;
    color: var(--color-navy);
}
.welcome-lecture {
    font-size: 0.82rem; color: var(--color-text-soft); margin-bottom: 24px;
}
.welcome-btn { width: 100%; }

/* --- Timelapse Vertical (izquierda) --- */
.v-timelapse {
    position: fixed; top: 50%; left: 12px; z-index: 997;
    transform: translateY(-50%);
    display: flex; flex-direction: column; align-items: center;
    gap: 2px;
    padding: 12px 0;
}
.vt-line {
    position: absolute; top: 28px; bottom: 28px; left: 50%;
    width: 2px;
    background: linear-gradient(180deg,
        var(--color-primary),
        var(--color-accent) 50%,
        var(--color-primary) 100%);
    opacity: 0.2;
    transform: translateX(-50%);
    border-radius: 1px;
}
.v-timelapse:hover .vt-line { opacity: 0.35; }

.vt-dot {
    position: relative; z-index: 2;
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    background: transparent; border: none; cursor: pointer;
    font-family: var(--font-main);
    transition: all 0.3s var(--transition);
    padding: 0;
}
.vt-dot-ring {
    position: absolute; inset: 0;
    border-radius: 50%;
    background: var(--color-bg-light);
    border: 2px solid var(--color-border);
    transition: all 0.3s var(--transition);
}
.vt-dot-num {
    position: relative; z-index: 1;
    font-size: 0.65rem; font-weight: 700;
    color: var(--color-text-muted);
    transition: all 0.3s var(--transition);
    line-height: 1;
}
.vt-label {
    position: absolute; left: 40px; top: 50%;
    transform: translateY(-50%);
    font-size: 0.72rem; font-weight: 600;
    color: var(--color-text-soft);
    white-space: nowrap;
    opacity: 0;
    transition: all 0.2s ease;
    pointer-events: none;
}

/* Estado activo */
.vt-dot.active .vt-dot-ring {
    background: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(138, 21, 56, 0.15), 0 4px 12px rgba(138, 21,  مفصله, 0.3);
}
.vt-dot.active .vt-dot-num { color: var(--color-white); }
.vt-dot.active .vt-label {
    opacity: 1;
    color: var(--color-primary);
    font-weight: 700;
}

/* Hover dots no activos */
.vt-dot:not(.active):hover .vt-dot-ring {
    border-color: var(--color-primary);
    background: rgba(138, 21, 56, 0.05);
    transform: scale(1.12);
}
.vt-dot:not(.active):hover .vt-dot-num { color: var(--color-primary); }
.vt-dot:not(.active):hover .vt-label { opacity: 1; color: var(--color-text-main); }

/* --- Grupo derecho: QR + Gracias --- */
.right-group {
    position: fixed; bottom: 30px; right: 24px; z-index: 998;
    display: flex; flex-direction: column;
    align-items: center; gap: 12px;
}

.qr-cta {
    font-size: 0.65rem; font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    white-space: nowrap;
    opacity: 0.8;
    transition: opacity 0.3s;
}
.right-group:hover .qr-cta { opacity: 1; color: var(--color-primary); }

.qr-badge {
    width: 90px; height: 90px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-white);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
    cursor: pointer;
}
.qr-badge:hover {
    border-color: var(--color-primary);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}
.qr-badge-img { width: 100%; height: 100%; object-fit: contain; display: block; }

.gracias-btn {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    padding: 12px 20px; border-radius: 50px; border: none;
    background: var(--color-primary); color: white;
    cursor: pointer; font-family: var(--font-main); font-weight: 700;
    font-size: 0.9rem; letter-spacing: 0.3px;
    box-shadow: 0 6px 20px rgba(138, 21, 56, 0.4);
    transition: all var(--transition);
    white-space: nowrap;
}
.gracias-btn:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 12px 28px rgba(138, 21, 56, 0.5);
}

/* --- Pantalla de Cierre "Gracias" --- */
.gracias-overlay {
    position: fixed; inset: 0; z-index: 10000;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: all 0.5s var(--transition);
}
.gracias-overlay.open { opacity: 1; visibility: visible; }

.gracias-screen {
    text-align: center;
    color: var(--color-white);
    padding: 48px 36px;
    max-width: 520px;
    width: 90%;
    animation: gracias-float 3s ease-in-out infinite;
}
@keyframes gracias-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.gracias-close-btn {
    position: absolute; top: 20px; right: 24px;
    background: rgba(255,255,255,0.1); border: none;
    color: var(--color-white); font-size: 1.6rem;
    cursor: pointer; width: 40px; height: 40px;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    transition: all var(--transition);
}
.gracias-close-btn:hover { background: rgba(255,255,255,0.2); transform: rotate(90deg); }

.gracias-content { position: relative; }
.gracias-icon { font-size: 4rem; margin-bottom: 16px; }
.gracias-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800; margin-bottom: 12px;
    background: linear-gradient(135deg, var(--color-accent), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.gracias-sub { font-size: 1.2rem; color: var(--color-accent-soft); margin-bottom: 6px; }
.gracias-grupo { font-size: 1rem; color: rgba(255,255,255,0.7); margin-bottom: 28px; }
.gracias-names {
    display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
    margin-bottom: 20px;
}
.gracias-names span {
    background: rgba(255,255,255,0.1); padding: 6px 16px;
    border-radius: 50px; font-size: 0.85rem; font-weight: 600;
    border: 1px solid rgba(255,255,255,0.15);
}
.gracias-lecture { font-size: 0.82rem; color: rgba(255,255,255,0.5); margin-bottom: 32px; }
.gracias-actions {
    display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}
.gracias-actions .btn-primary {
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.3);
}
.gracias-cerrar-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 28px; border-radius: var(--radius-xs); font-weight: 600;
    background: rgba(255,255,255,0.1); color: var(--color-white);
    border: 1px solid rgba(255,255,255,0.2); cursor: pointer;
    font-family: var(--font-main); font-size: 0.98rem;
    transition: all var(--transition);
}
.gracias-cerrar-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

/* --- Atajos de teclado: hint en pantalla --- */
.kbd-hint {
    position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%);
    z-index: 9999;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    color: var(--color-white); padding: 16px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem; font-weight: 500;
    border: 1px solid rgba(212, 175, 55, 0.3);
    opacity: 0; visibility: hidden;
    transition: all 0.3s var(--transition);
    text-align: center;
    white-space: nowrap;
}
.kbd-hint.visible { opacity: 1; visibility: visible; }
.kbd-hint kbd {
    display: inline-block; padding: 2px 8px; margin: 0 2px;
    background: rgba(255,255,255,0.15); border-radius: 4px;
    font-family: monospace; font-weight: 700; font-size: 0.82rem;
}

/* Responsive */
@media (max-width: 768px) {
    .v-timelapse { display: none; }
    .right-group { display: none; }
    .right-group { bottom: 20px; right: 16px; gap: 8px; }
    .qr-badge { width: 70px; height: 70px; }
    .gracias-btn { padding: 10px 16px; font-size: 0.82rem; }
    /* modal-bienvenida eliminado */
}