/* ============================================
   NODO IA - Global Styles
   ============================================ */

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Core palette */
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a28;
    --text-primary: #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted: #555570;
    --border-subtle: rgba(255,255,255,0.06);
    --border-light: rgba(255,255,255,0.1);

    /* Accent colors */
    --cyan: #00f0ff;
    --cyan-glow: rgba(0, 240, 255, 0.15);
    --orange: #ff6b35;
    --orange-glow: rgba(255, 107, 53, 0.15);
    --purple: #a855f7;
    --purple-glow: rgba(168, 85, 247, 0.15);
    --green: #22c55e;
    --green-glow: rgba(34, 197, 94, 0.15);

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Selection */
::selection {
    background: var(--cyan);
    color: var(--bg-dark);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ============================================
   Top Navigation Bar (shared across subportals)
   ============================================ */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 var(--space-xl);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: all 0.3s var(--ease-out);
}

.top-nav.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.nav-brand-icon {
    width: 28px;
    height: 28px;
}

.nav-brand-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-brand-name span {
    color: var(--cyan);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color 0.2s;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    border-radius: 1px;
}

.nav-links a.nav-singularidad.active::after { background: var(--cyan); }
.nav-links a.nav-seminario.active::after { background: var(--orange); }
.nav-links a.nav-lebp.active::after { background: var(--purple); }

/* Mobile menu */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .top-nav {
        padding: 0 var(--space-md);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-xl);
        gap: var(--space-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s var(--ease-out);
        pointer-events: none;
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links a {
        font-size: 1rem;
        padding: var(--space-sm) 0;
    }
}

/* ============================================
   Utility classes
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: var(--space-3xl) 0;
}

.section-header {
    margin-bottom: var(--space-2xl);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    display: block;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.section-desc {
    color: var(--text-secondary);
    max-width: 600px;
    margin-top: var(--space-md);
    font-size: 0.95rem;
}

/* Fade in animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Tag/badge styles */
.tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: 0.2em 0.7em;
    border-radius: 100px;
    text-transform: uppercase;
}

.tag-cyan {
    background: var(--cyan-glow);
    color: var(--cyan);
    border: 1px solid rgba(0, 240, 255, 0.2);
}

.tag-orange {
    background: var(--orange-glow);
    color: var(--orange);
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.tag-purple {
    background: var(--purple-glow);
    color: var(--purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
}

.tag-green {
    background: var(--green-glow);
    color: var(--green);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

/* ============================================
   Subportal Identity System
   Visual cues to distinguish subportals
   ============================================ */

/* Top accent bar — thin colored strip at very top of page */
.page-singularidad::before,
.page-seminario::before,
.page-lebp::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 1001;
    pointer-events: none;
}

.page-singularidad::before {
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    box-shadow: 0 0 15px var(--cyan-glow);
}

.page-seminario::before {
    background: linear-gradient(90deg, transparent, var(--orange), transparent);
    box-shadow: 0 0 15px var(--orange-glow);
}

.page-lebp::before {
    background: linear-gradient(90deg, transparent, var(--purple), transparent);
    box-shadow: 0 0 15px var(--purple-glow);
}

/* Scrollbar accent per subportal */
.page-singularidad::-webkit-scrollbar-thumb { background: rgba(0,240,255,0.3); }
.page-singularidad::-webkit-scrollbar-thumb:hover { background: rgba(0,240,255,0.5); }

.page-seminario::-webkit-scrollbar-thumb { background: rgba(255,107,53,0.3); }
.page-seminario::-webkit-scrollbar-thumb:hover { background: rgba(255,107,53,0.5); }

.page-lebp::-webkit-scrollbar-thumb { background: rgba(168,85,247,0.3); }
.page-lebp::-webkit-scrollbar-thumb:hover { background: rgba(168,85,247,0.5); }

/* Selection color per subportal */
.page-singularidad ::selection { background: var(--cyan); color: var(--bg-dark); }
.page-seminario ::selection { background: var(--orange); color: #fff; }
.page-lebp ::selection { background: var(--purple); color: #fff; }

/* Nav brand accent per subportal */
.page-singularidad .nav-brand-name span { color: var(--cyan); }
.page-seminario .nav-brand-name span { color: var(--orange); }
.page-lebp .nav-brand-name span { color: var(--purple); }

/* Nav background tint per subportal */
.page-singularidad .top-nav {
    border-bottom-color: rgba(0,240,255,0.08);
}
.page-singularidad .top-nav.scrolled {
    border-bottom-color: rgba(0,240,255,0.12);
}

.page-seminario .top-nav {
    background: rgba(6,11,24,0.85);
    border-bottom-color: rgba(255,107,53,0.08);
}
.page-seminario .top-nav.scrolled {
    background: rgba(6,11,24,0.97);
    border-bottom-color: rgba(255,107,53,0.12);
}

.page-lebp .top-nav {
    background: rgba(8,5,26,0.85);
    border-bottom-color: rgba(168,85,247,0.1);
}
.page-lebp .top-nav.scrolled {
    background: rgba(8,5,26,0.97);
    border-bottom-color: rgba(168,85,247,0.15);
}

/* Active nav link color per subportal */
.page-singularidad .nav-links a.active { color: var(--cyan); }
.page-seminario .nav-links a.active { color: var(--orange); }
.page-lebp .nav-links a.active { color: var(--purple); }

/* Mobile nav panel tint per subportal */
@media (max-width: 768px) {
    .page-seminario .nav-links {
        background: rgba(6,11,24,0.98);
    }
    .page-lebp .nav-links {
        background: rgba(8,5,26,0.98);
    }
}

/* Nav icon central node adapts to subportal */
.page-singularidad .nav-brand-icon circle:first-child { fill: var(--cyan); }
.page-seminario .nav-brand-icon circle:first-child { fill: var(--orange); }
.page-lebp .nav-brand-icon circle:first-child { fill: var(--purple); }