/* ==========================================================================
   Variables Globales e Identidad Institucional
   ========================================================================== */
:root {
    --color-primary: #1b396a;       /* Azul Institucional */
    --color-secondary: #D96313;     /* Naranja Institucional */
    --color-secondary-hover: #b8510d;
    --color-bg-white: #ffffff;
    --color-bg-light: #f9fafb;
    --color-text-main: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Montserrat', sans-serif;
}

/* Base resets */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-sans);
    color: var(--color-text-main);
    background-color: var(--color-bg-white);
}

body {
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ==========================================================================
   Header & Navegación
   ========================================================================== */
.header {
    width: 100%;
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand-logo {
    background-color: var(--color-primary);
    color: white;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.1rem;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-sub {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 800;
    color: var(--color-secondary);
    letter-spacing: 0.5px;
}

.brand-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-menu a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-main);
    transition: color 0.2s;
}

.nav-menu a:hover {
    color: var(--color-secondary);
}

.btn-nav {
    background-color: var(--color-secondary);
    color: white !important;
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    font-weight: 700 !important;
    transition: background-color 0.2s !important;
}

.btn-nav:hover {
    background-color: var(--color-secondary-hover);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-primary);
    cursor: pointer;
}

/* ==========================================================================
   Barra de Logotipos Institucionales
   ========================================================================== */
.logos-bar {
    width: 100%;
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 1rem;
}

.logos-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.img-logo {
    height: auto;
    max-height: 45px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0px 1px 1px rgba(0, 0, 0, 0.05));
    transition: transform 0.2s ease;
}

.img-logo:hover {
    transform: scale(1.03);
}

/* Ajustes específicos de escala por logo */
.logo-sep { max-height: 38px; }
.logo-tecnm { max-height: 48px; }
.logo-itq { max-height: 52px; }
.logo-gob { max-height: 38px; }

/* Adaptación para pantallas móviles */
@media (max-width: 768px) {
    .logos-container {
        justify-content: center;
        gap: 1rem;
    }
    
    .img-logo {
        max-height: 32px;
    }
    
    .logo-itq { max-height: 40px; }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    padding: 4rem 1.5rem;
    text-align: center;
    background-color: var(--color-bg-white);
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.badge-date {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    background-color: #fff3eb;
    border: 1px solid #fcd34d;
    color: var(--color-secondary);
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-title span {
    color: var(--color-secondary);
}

.hero-description {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.hero-description a {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--color-secondary);
}

/* Countdown */
.countdown-card {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    max-width: 600px;
    margin: 0 auto 3rem;
}

.countdown-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.countdown-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.countdown-box {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 0.75rem;
}

.countdown-box span {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--color-primary);
}

.countdown-box span.highlight {
    color: var(--color-secondary);
}

.countdown-box small {
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-weight: 600;
}

/* Ejes temáticos */
.ejes-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 800;
    color: var(--color-secondary);
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.ejes-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.tag {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
}

.tag i {
    color: var(--color-primary);
    margin-right: 0.4rem;
}

/* ==========================================================================
   Secciones Generales
   ========================================================================== */
.section {
    padding: 4rem 1.5rem;
}

.bg-light {
    background-color: var(--color-bg-light);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

/* Cronograma / Programa */
.timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.timeline-day {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.timeline-day h3 {
    color: var(--color-secondary);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--color-bg-light);
    padding-bottom: 0.5rem;
}

.timeline-event {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.timeline-event .time {
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

/* Cards (Conferencias y Talleres) */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    gap: 1.25rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.card-avatar {
    background-color: var(--color-primary);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.card-avatar.alt {
    background-color: var(--color-secondary);
}

.card-content h3 {
    font-size: 1.1rem;
    color: var(--color-primary);
}

.profesion {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-secondary);
}

.puesto {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: 0.75rem 0;
}

.titulo-charla {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.meta {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Formularios y Pestañas de Registro
   ========================================================================== */
.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--color-border);
    background: white;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.tab-content {
    display: none;
    max-width: 650px;
    margin: 0 auto;
}

.tab-content.active {
    display: block;
}

.form-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.form-card h3 {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
}

.form-group input, 
.form-group select {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: inherit;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.member-header {
    margin: 1.5rem 0 1rem;
    font-size: 0.95rem;
    color: var(--color-secondary);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.25rem;
}

.member-box {
    background-color: var(--color-bg-light);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.member-title {
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.mt-2 { margin-top: 0.5rem; width: 100%; }

.btn-submit {
    width: 100%;
    padding: 0.85rem;
    background-color: var(--color-secondary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
    margin-top: 1rem;
}

.btn-submit:hover {
    background-color: var(--color-secondary-hover);
}

.btn-submit:disabled {
    background-color: #cbd5e1;
    cursor: not-allowed;
}

/* ==========================================================================
   Posters y Galería
   ========================================================================== */
.poster-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    width: 100%;
}

.poster-icon {
    font-size: 3rem;
    color: var(--color-secondary);
    margin-bottom: 1rem;
}

.btn-outline {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.6rem 1.25rem;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    border-radius: 8px;
    font-weight: 700;
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: white;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.gallery-item {
    background-color: var(--color-bg-light);
    border: 1px dashed var(--color-border);
    height: 150px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    gap: 0.5rem;
}

.gallery-item i {
    font-size: 2rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: white;
    border-top: 1px solid var(--color-border);
    padding: 2rem 1.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 0.5rem;
}

.footer-links a:hover {
    color: var(--color-primary);
}

/* ==========================================================================
   Responsividad y Media Queries
   ========================================================================== */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        border-bottom: 1px solid var(--color-border);
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .card {
        flex-direction: column;
        text-align: center;
    }

    .card-avatar {
        margin: 0 auto;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}