/*
 * design-system.css — Tokens de diseño y reset base.
 * Responsabilidad: Variables CSS, reset, tipografía base.
 * NO contiene estilos de componentes ni layouts.
 */

/* ═══════════════════════════════════════════
   1. CSS Custom Properties (Design Tokens)
   ═══════════════════════════════════════════ */

:root {
    /* Colores — Paleta institucional UdeC + Física */
    --color-primary: #003366;
    --color-primary-light: #0A6EBD;
    --color-primary-dark: #002244;
    --color-accent: #F0C14B;
    --color-accent-dark: #D4A533;

    /* Superficies */
    --color-bg: #F6F8FB;
    --color-bg-alt: #EAF0F6;
    --color-bg-card: #FFFFFF;
    --color-bg-hover: #E4ECF5;
    --color-surface-light: #F8F9FA;

    /* Texto */
    --color-text: #152238;
    --color-text-secondary: #3F4D63;
    --color-text-muted: #5E6E87;
    --color-text-on-primary: #FFFFFF;

    /* Estados */
    --color-success: #2EA043;
    --color-warning: #D29922;
    --color-error: #F85149;
    --color-link: #0A6EBD;
    --color-link-hover: #085CA0;

    /* Bordes */
    --color-border: #CFD8E5;
    --color-border-light: #DEE5EF;

    /* Tipografía */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height: 1.6;
    --line-height-tight: 1.2;

    /* Tipografía formal institucional (tokens) */
    --type-formal-overline-size: var(--font-size-xs);
    --type-formal-overline-weight: var(--font-weight-medium);
    --type-formal-overline-tracking: 0.05em;
    --type-formal-label-size: 0.65rem;
    --type-formal-label-weight: var(--font-weight-semibold);
    --type-formal-label-tracking: 0.07em;
    --type-formal-card-title-size: var(--font-size-base);
    --type-formal-card-title-weight: var(--font-weight-semibold);
    --type-formal-card-title-leading: 1.4;
    --type-formal-body-sm-size: var(--font-size-sm);
    --type-formal-body-sm-leading: 1.6;
    --type-formal-section-title-weight: var(--font-weight-semibold);
    --type-formal-section-title-tracking: -0.01em;

    /* Espaciado */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --navbar-height: 108px;
    --navbar-scroll-offset: 9rem;
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    --border-radius-full: 9999px;

    /* Transiciones — curvas suaves para navegación y hover */
    --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-enter: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-exit: cubic-bezier(0.4, 0, 0.6, 1);
    --transition-fast: 220ms var(--ease-soft);
    --transition-base: 380ms var(--ease-soft);
    --transition-slow: 520ms var(--ease-soft);
    --duration-enter: 1s;
    --duration-enter-fast: 0.8s;
    --duration-exit: 0.42s;
    --hero-text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 4px 14px rgba(0, 0, 0, 0.28);
    --hero-text-shadow-strong: 0 2px 4px rgba(0, 0, 0, 0.55), 0 6px 18px rgba(0, 0, 0, 0.32);

    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(13, 26, 43, 0.08);
    --shadow-md: 0 6px 14px rgba(13, 26, 43, 0.1);
    --shadow-lg: 0 12px 28px rgba(13, 26, 43, 0.12);
    --shadow-xl: 0 20px 44px rgba(13, 26, 43, 0.16);
}


/* ═══════════════════════════════════════════
   2. CSS Reset
   ═══════════════════════════════════════════ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-base), opacity var(--transition-base);
}

a:hover {
    color: var(--color-link-hover);
}

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--space-md);
}

table {
    border-collapse: collapse;
    width: 100%;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
    transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), opacity var(--transition-base);
}


/* ═══════════════════════════════════════════
   3. Accesibilidad
   ═══════════════════════════════════════════ */

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: var(--color-primary-dark);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--border-radius);
    z-index: 9999;
    transition: top var(--transition-base);
}

.skip-link:focus {
    top: var(--space-md);
}


/* ═══════════════════════════════════════════
   4. Utilidades
   ═══════════════════════════════════════════ */

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* Tipografía formal — clases reutilizables (única fuente de estilo tipográfico) */
.type-formal-overline {
    font-size: var(--type-formal-overline-size);
    font-weight: var(--type-formal-overline-weight);
    letter-spacing: var(--type-formal-overline-tracking);
    text-transform: uppercase;
    line-height: 1.4;
    color: var(--color-text-muted);
}

.type-formal-label {
    font-size: var(--type-formal-label-size);
    font-weight: var(--type-formal-label-weight);
    letter-spacing: var(--type-formal-label-tracking);
    text-transform: uppercase;
    line-height: 1.4;
}

.type-formal-card-title {
    font-size: var(--type-formal-card-title-size);
    font-weight: var(--type-formal-card-title-weight);
    line-height: var(--type-formal-card-title-leading);
    color: var(--color-text);
    margin: 0;
}

h1.type-formal-card-title,
h2.type-formal-card-title,
h3.type-formal-card-title,
h4.type-formal-card-title {
    font-size: var(--type-formal-card-title-size);
    font-weight: var(--type-formal-card-title-weight);
    line-height: var(--type-formal-card-title-leading);
}

.type-formal-body-sm {
    font-size: var(--type-formal-body-sm-size);
    line-height: var(--type-formal-body-sm-leading);
    color: var(--color-text-secondary);
    margin: 0;
}

.type-formal-section-title {
    font-weight: var(--type-formal-section-title-weight);
    letter-spacing: var(--type-formal-section-title-tracking);
    margin-bottom: 0;
}

.type-formal-emphasis {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.type-formal-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

body.menu-open {
    overflow: hidden;
}

body.menu-open::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 998;
    background: linear-gradient(
        90deg,
        rgba(0, 34, 68, 0.42) 0%,
        rgba(0, 51, 102, 0.28) 100%
    );
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
    body.menu-open::before {
        animation: overlay-fade-in var(--transition-slow) var(--ease-enter) both;
    }
}

@keyframes overlay-fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@media (prefers-reduced-motion: no-preference) {
    .person-card,
    .news-card,
    .research-card,
    .graduate-program-card,
    .graduate-line-card,
    .specialization-card,
    .resource-card,
    .quick-access-card,
    .info-card,
    .btn,
    .footer__shell,
    .footer__block,
    .footer__link,
    .footer__social-link {
        transition:
            color var(--transition-base),
            background-color var(--transition-base),
            border-color var(--transition-base),
            box-shadow var(--transition-base),
            transform var(--transition-base),
            opacity var(--transition-base);
    }

    .person-card:hover,
    .news-card:hover,
    .research-card:hover,
    .graduate-program-card:hover,
    .graduate-line-card:hover,
    .specialization-card:hover,
    .resource-card:hover,
    .quick-access-card:hover {
        transform: translateY(-2px);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}