/* ============================================
   GUÍA DE EVALUACIÓN NUTRICIONAL EN EL EMBARAZO
   UTB – Facultad de Ciencias de la Salud
   ============================================ */

:root {
    --green-50: #f0fdf4;
    --green-100: #dcfce7;
    --green-200: #bbf7d0;
    --green-300: #86efac;
    --green-400: #4ade80;
    --green-500: #22c55e;
    --green-600: #16a34a;
    --green-700: #15803d;
    --green-800: #166534;
    --green-900: #14532d;
    --olive-500: #5b8c51;
    --olive-600: #4a7342;
    --cream-50: #fefcf7;
    --cream-100: #fdf6e3;
    --cream-200: #faebc6;
    --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;
    --white: #ffffff;
    --orange: #f59e0b;
    --orange-dark: #d97706;
    --red-500: #ef4444;
    --red-600: #dc2626;
    --blue-500: #3b82f6;
    --purple-500: #8b5cf6;
    --amber-500: #f59e0b;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--slate-700);
    background: var(--cream-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* TOP BAR */
.top-bar {
    background: var(--green-800);
    color: var(--white);
    font-size: 0.8rem;
    padding: 8px 0;
    letter-spacing: 0.3px;
}
.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}
.top-bar i { margin-right: 6px; color: var(--green-300); }

/* NAVBAR */
.navbar {
    background: var(--white);
    border-bottom: 1px solid var(--slate-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow-lg); }
.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    padding-bottom: 14px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--green-700);
    text-decoration: none;
}
.logo-icon {
    background: linear-gradient(135deg, var(--green-400), var(--green-600));
    color: var(--white);
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}
.nav-links {
    display: flex;
    gap: 6px;
    list-style: none;
}
.nav-links a {
    text-decoration: none;
    color: var(--slate-600);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
    background: var(--green-50);
    color: var(--green-700);
}
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--slate-700);
    cursor: pointer;
    padding: 4px;
}

/* HERO */
.hero {
    position: relative;
    min-height: 620px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--green-800) 0%, #0d3b1e 40%, var(--green-900) 100%);
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(34, 197, 94, 0.15) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 50%, rgba(74, 222, 128, 0.08) 0%, transparent 60%);
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--cream-50), transparent);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 80px 24px;
    color: var(--white);
}
.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 28px;
}
.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 20px;
}
.hero-subtitle {
    font-size: 1.15rem;
    opacity: 0.85;
    line-height: 1.8;
    margin-bottom: 36px;
}
.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: var(--green-500);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(34,197,94,0.35);
}
.btn-primary:hover {
    background: var(--green-600);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(34,197,94,0.45);
}
.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--white);
}

/* SECTION GLOBALS */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}
.section-tag {
    display: inline-block;
    background: var(--green-50);
    color: var(--green-700);
    padding: 6px 18px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 16px;
}
.section-header h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--slate-800);
    margin-bottom: 12px;
}
.section-header p {
    color: var(--slate-500);
    font-size: 1.05rem;
    max-width: 650px;
    margin: 0 auto;
}

/* AUTORES */
.autores-section {
    padding: 80px 0;
    background: var(--white);
}
.autores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}
.autor-card {
    background: var(--cream-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 30px 20px;
    text-align: center;
    transition: var(--transition);
}
.autor-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-200);
}
.autor-avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--green-400), var(--green-600));
    color: var(--white);
    font-weight: 700;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    letter-spacing: 1px;
}
.autor-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--slate-800);
    margin-bottom: 4px;
}
.autor-card p {
    font-size: 0.85rem;
    color: var(--slate-500);
}

.tutor-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: linear-gradient(135deg, var(--green-50), var(--green-100));
    border: 1px solid var(--green-200);
    border-radius: var(--radius-lg);
    padding: 24px 32px;
    flex-wrap: wrap;
}
.tutor-avatar {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--green-600);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}
.tutor-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--green-600);
    margin-bottom: 4px;
}
.tutor-info h3 { font-size: 1.1rem; color: var(--slate-800); }
.tutor-linea {
    margin-left: auto;
    background: var(--white);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--slate-600);
    border: 1px solid var(--green-200);
}

/* OBJETIVOS */
.seccion { padding: 80px 0; background: var(--cream-100); }
.objetivos-wrapper { display: flex; flex-direction: column; gap: 24px; }
.objetivo-general { max-width: 600px; }
.obj-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-200);
    transition: var(--transition);
}
.obj-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.obj-card.highlighted {
    background: linear-gradient(135deg, var(--green-50), var(--green-100));
    border-color: var(--green-300);
}
.obj-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--green-400), var(--green-600));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-bottom: 18px;
}
.obj-card h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--slate-800);
    margin-bottom: 10px;
}
.obj-card p { color: var(--slate-600); font-size: 0.95rem; }
.objetivos-especificos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

/* MARCO TEÓRICO */
.seccion-marco { padding: 80px 0; background: var(--white); }
.marco-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}
.marco-card {
    background: var(--cream-50);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--slate-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.marco-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--green-500);
    border-radius: 4px 0 0 4px;
}
.marco-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.marco-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--green-100);
    color: var(--green-700);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
}
.marco-card h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    color: var(--slate-800);
    margin-bottom: 12px;
}
.marco-card p { color: var(--slate-600); font-size: 0.95rem; line-height: 1.75; }

/* ABCD */
.seccion-abcd { padding: 80px 0; background: linear-gradient(180deg, var(--cream-100), var(--white)); }
.abcd-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.abcd-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    border: 1px solid var(--slate-200);
    transition: var(--transition);
    position: relative;
}
.abcd-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.abcd-letter {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--green-400), var(--green-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.b-card .abcd-letter { background: linear-gradient(135deg, var(--blue-500), var(--purple-500)); -webkit-background-clip: text; }
.c-card .abcd-letter { background: linear-gradient(135deg, var(--amber-500), var(--orange-dark)); -webkit-background-clip:text; }
.d-card .abcd-letter { background: linear-gradient(135deg, var(--green-500), var(--green-600)); -webkit-background-clip:text; }
.abcd-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--slate-800);
    margin-bottom: 10px;
}
.abcd-card p { color: var(--slate-600); font-size: 0.9rem; margin-bottom: 16px; }
.abcd-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.abcd-list li {
    font-size: 0.85rem;
    color: var(--slate-600);
    display: flex;
    align-items: center;
    gap: 8px;
}
.abcd-list i { color: var(--green-500); font-size: 0.9rem; }

/* TABLAS */
.tablas-section { padding: 80px 0; background: var(--white); }
.tablas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 28px;
}
.tabla-card { background: var(--cream-50); border-radius: var(--radius-lg); padding: 28px; border: 1px solid var(--slate-200); }
.tabla-card.full-width { grid-column: 1 / -1; }
.tabla-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--slate-800);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.tabla-card h3 i { color: var(--green-600); }

.tabla-estilizada {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 14px;
}
.tabla-estilizada thead th {
    background: var(--green-600);
    color: var(--white);
    padding: 12px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: left;
    letter-spacing: 0.3px;
}
.tabla-estilizada tbody td {
    padding: 11px 16px;
    border-bottom: 1px solid var(--slate-200);
    font-size: 0.9rem;
    color: var(--slate-700);
}
.tabla-estilizada tbody tr:hover { background: var(--green-50); }
.tabla-estilizada tbody tr:last-child td { border-bottom: none; }
.tabla-fuente {
    font-size: 0.75rem;
    color: var(--slate-400);
    font-style: italic;
    margin-top: 8px;
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}
.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef9c3; color: #854d0e; }
.badge-orange { background: #fed7aa; color: #9a3412; }
.badge-danger { background: #fecaca; color: #991b1b; }
.badge-dark { background: #e2e8f0; color: #334155; }
.badge-light { background: #f0fdf4; color: #166534; }

/* RECOMENDACIONES */
.recomendaciones-section { padding: 80px 0; background: var(--cream-100); }
.trimestres-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
    margin-bottom: 60px;
}
.trimestre-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    border: 1px solid var(--slate-200);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.trimestre-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    border-radius: 0 0 4px 4px;
}
.trimestre-card:nth-child(1)::after { background: var(--green-400); }
.trimestre-card:nth-child(2)::after { background: var(--blue-500); }
.trimestre-card:nth-child(3)::after { background: var(--purple-500); }
.trimestre-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.trimestre-num {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--green-200);
    line-height: 1;
}
.trimestre-card:nth-child(2) .trimestre-num { color: var(--slate-200); }
.trimestre-card:nth-child(3) .trimestre-num { color: var(--slate-200); }
.trimestre-card h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    color: var(--slate-800);
    margin-bottom: 4px;
}
.trimestre-semanas {
    display: block;
    font-size: 0.85rem;
    color: var(--green-600);
    font-weight: 500;
    margin-bottom: 16px;
}
.trimestre-card p { color: var(--slate-600); font-size: 0.9rem; margin-bottom: 18px; }
.nutrientes-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 18px;
}
.nutriente-tag {
    background: var(--green-50);
    color: var(--green-700);
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--green-200);
}
.trimestre-beneficio {
    display: flex;
    gap: 10px;
    text-align: left;
    background: var(--cream-100);
    padding: 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--slate-600);
}
.trimestre-beneficio i { color: var(--green-600); flex-shrink: 0; margin-top: 2px; }

/* PLATO SALUDABLE */
.plato-saludable { margin-top: 40px; }
.plato-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.plato-item {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    text-align: center;
    border: 2px solid var(--slate-200);
    transition: var(--transition);
}
.plato-item:hover { border-color: var(--green-400); transform: scale(1.03); }
.plato-item i { font-size: 2rem; color: var(--green-600); margin-bottom: 10px; display: block; }
.plato-item span { font-weight: 600; color: var(--slate-700); font-size: 0.9rem; }
.plato-note {
    text-align: center;
    color: var(--slate-500);
    font-size: 0.9rem;
    font-style: italic;
    margin-top: 16px;
}

/* CONCLUSIONES */
.conclusion-section { padding: 80px 0; background: var(--white); }
.conclusion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}
.conclusion-card {
    background: linear-gradient(135deg, var(--green-50), var(--white));
    border: 1px solid var(--green-200);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
}
.conclusion-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.conclusion-num {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--green-300);
    line-height: 1;
    margin-bottom: 12px;
}
.conclusion-card p { color: var(--slate-600); font-size: 0.95rem; line-height: 1.75; }

/* FOOTER */
.site-footer {
    background: var(--slate-800);
    color: var(--slate-300);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 36px;
    margin-bottom: 40px;
}
.footer-col h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--white);
    margin-bottom: 16px;
}
.footer-col h4 i { color: var(--green-400); margin-right: 6px; }
.footer-col p { font-size: 0.85rem; margin-bottom: 6px; line-height: 1.6; }
.footer-bottom {
    border-top: 1px solid var(--slate-700);
    padding: 20px 0;
    text-align: center;
    font-size: 0.8rem;
}

/* BACK TO TOP */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--green-600);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 99;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--green-700); }

/* RESPONSIVE */
@media (max-width: 1024px) {
    .tablas-grid { grid-template-columns: 1fr; }
    .tabla-card.full-width { grid-column: auto; }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        border-top: 1px solid var(--slate-200);
        box-shadow: var(--shadow-lg);
    }
    .nav-links.active { display: flex; }
    .menu-toggle { display: block; }
    .top-bar .container { justify-content: center; text-align: center; }
    .hero { min-height: 500px; }
    .hero-content { padding: 60px 20px; }
    .tutor-card { flex-direction: column; text-align: center; }
    .tutor-linea { margin-left: 0; }
    .tablas-grid { grid-template-columns: 1fr; }
    .tabla-estilizada { font-size: 0.8rem; }
}
@media (max-width: 480px) {
    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-buttons .btn { width: 100%; max-width: 300px; }
}