/* 
 * Premium Editorial Swiss Design System
 * Focus: Clarity, strong typography, deep charcoal & pure white, subtle interactions
 */

:root {
    /* Colors - Strict Editorial Palette */
    --swiss-red: #D52B1E;
    --swiss-red-hover: #B31E12;
    --swiss-red-light: rgba(213, 43, 30, 0.05); /* very subtle background tint */
    
    --text-primary: #111111; /* Deep charcoal for ultimate readability */
    --text-secondary: #4A4A4A;
    --text-light: #767676;
    --text-lighter: #A1A1A1;
    
    --bg-main: #FFFFFF;
    --bg-surface: #F8F9FA; /* Ultra light grey for secondary surfaces */
    --bg-card: #FFFFFF;
    
    --border-light: #EAEAEA;
    --border-medium: #D1D1D1;
    --border-dark: #111111;
    
    /* Typography */
    --font-heading: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;   /* 8px */
    --space-sm: 1rem;     /* 16px */
    --space-md: 2rem;     /* 32px */
    --space-lg: 4rem;     /* 64px */
    --space-xl: 6rem;     /* 96px */
    --space-xxl: 8rem;    /* 128px */
    
    /* Layout */
    --container-width: 1140px; /* Slightly narrower for editorial feel */
    --article-width: 720px;    /* Optimal reading width */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    background-color: var(--bg-main);
    line-height: 1.7; /* Increased for editorial readability */
    font-size: 1.125rem; /* 18px base */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-sm);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--swiss-red);
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--text-primary);
    color: white;
    padding: 12px;
    z-index: 9999;
}
.skip-link:focus {
    top: 0;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); margin-bottom: var(--space-md); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); margin-top: var(--space-lg); padding-bottom: var(--space-xs); border-bottom: 1px solid var(--border-light); }
h3 { font-size: 1.5rem; margin-top: var(--space-md); }
h4 { font-size: 1.25rem; font-weight: 600; }

p { margin-bottom: var(--space-md); color: var(--text-secondary); }
ul, ol { margin-bottom: var(--space-md); padding-left: var(--space-md); color: var(--text-secondary); }
li { margin-bottom: var(--space-xs); }

/* Strong elements */
strong, b {
    color: var(--text-primary);
    font-weight: 600;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-smooth);
    cursor: pointer;
    border: 1px solid transparent;
    gap: 8px;
    text-decoration: none;
    line-height: 1;
}

.btn-primary {
    background-color: var(--swiss-red);
    color: white;
}

.btn-primary:hover {
    background-color: var(--swiss-red-hover);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(213, 43, 30, 0.2);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--border-medium);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--swiss-red);
    color: var(--swiss-red);
}

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

/* Header & Nav */
.site-header {
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
    backdrop-filter: blur(8px);
    transition: padding var(--transition-smooth);
}

.site-header.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.logo-link svg {
    flex-shrink: 0;
}

.logo-link .flag-ch {
    width: 24px;
    height: 24px;
}

.logo-link .flag-es {
    width: 21px;
    height: 14px;
    opacity: 0.95;
}

.logo-link:hover {
    color: var(--text-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--swiss-red);
    transition: width var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--text-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--swiss-red);
}

/* Dropdown Menu */
.dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.dropdown-toggle {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 0;
    transition: color var(--transition-fast);
}

.dropdown-toggle:hover, .dropdown.open .dropdown-toggle {
    color: var(--swiss-red);
}

.dropdown-toggle svg {
    transition: transform var(--transition-fast);
}

.dropdown.open .dropdown-toggle svg {
    transform: rotate(180deg);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    min-width: 200px;
    padding: 0.5rem 0;
    list-style: none;
    z-index: 1000;
    margin-top: 0.5rem;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.dropdown.open .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: fadeIn 0.2s ease forwards;
}

/* Invisible bridge to prevent pointer leaving when moving to menu */
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -1rem;
    left: 0;
    width: 100%;
    height: 1rem;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu .nav-link {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.dropdown-menu .nav-link::after {
    display: none;
}

.dropdown-menu .nav-link:hover {
    background: var(--bg-surface);
    color: var(--swiss-red);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
}

/* Reading Progress Bar */
.reading-progress-container {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: transparent;
    z-index: 1001;
    display: none; /* Only show on articles */
}

.reading-progress-bar {
    height: 100%;
    background: var(--swiss-red);
    width: 0%;
    transition: width 0.1s linear;
}

/* Page Transitons & Animation Classes */
.main-content {
    flex: 1;
    opacity: 1;
    transition: opacity var(--transition-smooth);
}

.page-transitioning {
    opacity: 0;
}

.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hero Section */
.hero-section {
    padding: var(--space-xl) 0 var(--space-lg);
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.35rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--space-md);
}

/* Quick Start Cards (Empezar Aquí) */
.quick-start-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: var(--space-lg) 0;
}

.card-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
    color: var(--text-primary);
}

.card-icon svg {
    margin-bottom: 1rem;
    color: var(--swiss-red);
    width: 32px;
    height: 32px;
}

.card-icon h3 {
    margin: 0;
    font-size: 1.125rem;
}

.card-icon:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-medium);
}

/* Topic Hub Cards */
.topic-hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin: var(--space-md) 0 var(--space-xl);
}

.card-hub {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    background: white;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    transition: all var(--transition-smooth);
}

.card-hub:hover {
    border-color: var(--text-primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card-hub h3 {
    margin-top: 0;
    font-size: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-hub p {
    flex-grow: 1;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.card-hub .read-more {
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Article Layout */
.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
    position: relative;
}

@media (min-width: 1024px) {
    .article-layout {
        grid-template-columns: minmax(0, var(--article-width)) 300px;
        justify-content: center;
    }
}

/* Article Header & Meta */
.article-header {
    margin-bottom: var(--space-md);
}

.breadcrumbs {
    display: flex;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
}

.breadcrumbs a {
    color: var(--text-secondary);
}

.breadcrumbs a:hover {
    color: var(--swiss-red);
}

.article-meta {
    display: flex;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 1rem 0 2rem;
    align-items: center;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Article Formatting */
.article-content {
    font-size: 1.125rem;
    line-height: 1.7;
}

.article-content h2 {
    margin-top: 2.5em;
}

.article-content h3 {
    margin-top: 2em;
}

/* Summary Box */
.box-summary {
    background: var(--bg-surface);
    border-left: 3px solid var(--swiss-red);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.box-summary h4 {
    margin-top: 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.box-summary p:last-child {
    margin-bottom: 0;
}

/* Official Source Box */
.box-official {
    background: transparent;
    border: 1px solid var(--border-medium);
    padding: 1.25rem;
    margin: 2rem 0;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.box-official svg {
    color: var(--text-light);
    flex-shrink: 0;
    margin-top: 4px;
}

.box-official div {
    flex-grow: 1;
}

.box-official p {
    margin: 0;
    font-size: 0.95rem;
}

.box-official h4 {
    margin-bottom: 4px;
    font-size: 1rem;
}

/* Important Callout */
.callout {
    padding: 1.25rem 1.5rem;
    background: rgba(213, 43, 30, 0.05); /* very light red */
    border-left: 4px solid var(--swiss-red);
    margin: 2rem 0;
    font-size: 1.05rem;
}

/* Accordion (FAQ) */
.accordion {
    margin: var(--space-md) 0;
    border-bottom: 1px solid var(--border-light);
}

.accordion-item {
    border-top: 1px solid var(--border-light);
}

.accordion-header {
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    padding: 1.25rem 0;
    font-family: inherit;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition-fast);
}

.accordion-header:hover {
    color: var(--swiss-red);
}

.accordion-icon {
    width: 20px;
    height: 20px;
    position: relative;
}

.accordion-icon::before,
.accordion-icon::after {
    content: '';
    position: absolute;
    background: currentColor;
    border-radius: 2px;
    transition: transform var(--transition-fast);
}

.accordion-icon::before {
    top: 9px; left: 2px; right: 2px; height: 2px;
}

.accordion-icon::after {
    left: 9px; top: 2px; bottom: 2px; width: 2px;
}

.accordion-item.active .accordion-icon::after {
    transform: rotate(90deg) scaleY(0);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-smooth);
}

.accordion-content-inner {
    padding: 0 0 1.5rem 0;
    color: var(--text-secondary);
}

/* Community Section */
.community-section {
    background: var(--text-primary);
    color: white;
    padding: var(--space-xl) 0;
    text-align: center;
    border-radius: var(--radius-lg);
    margin: var(--space-xl) 0;
}

.community-section h2, 
.community-section h3, 
.community-section p {
    color: white;
}

.community-section h2 { border-bottom: none; }

.community-section .callout {
    background: rgba(255,255,255,0.1);
    border-left-color: white;
    text-align: left;
    max-width: 600px;
    margin: 2rem auto;
}

/* Sidebar (Table of Contents) */
.sidebar {
    position: sticky;
    top: 100px;
    align-self: start;
    display: none;
}

@media (min-width: 1024px) {
    .sidebar { display: block; }
}

.toc {
    background: var(--bg-surface);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

.toc h4 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light);
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc li {
    margin-bottom: 0.5rem;
}

.toc a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: block;
    line-height: 1.4;
}

.toc a:hover, .toc a.active {
    color: var(--swiss-red);
}

/* Featured / Most Read Articles */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: var(--space-md) 0;
}

.card-article {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-smooth);
    background: white;
}

.card-article:hover {
    border-color: var(--text-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-meta {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--swiss-red);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-article h3 {
    margin-top: 0;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.card-article p {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(17, 17, 17, 0.1);
}

/* Footer (Editorial) */
.site-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-light);
    padding-top: var(--space-xl);
    margin-top: auto;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-col p { font-size: 0.95rem; }
.footer-col h4 { margin-top: 0; margin-bottom: 1.5rem; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 0.5rem; font-size: 0.95rem; }

.footer-bottom {
    border-top: 1px solid var(--border-medium);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Search Bar Component */
.search-container {
    max-width: 600px;
    margin: 0 auto var(--space-md);
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1.125rem;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .hero-section { padding: var(--space-lg) 0 var(--space-md); }
    h1 { margin-bottom: 1rem; }
    
    .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        padding: var(--space-md);
        border-bottom: 1px solid var(--border-light);
        clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
        transition: clip-path var(--transition-smooth);
        backdrop-filter: blur(8px);
    }
    
    .main-nav.open {
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }

    .nav-list { flex-direction: column; width: 100%; align-items: flex-start; }
    .mobile-menu-toggle { display: block; }

    /* Mobile Dropdown Overrides */
    .dropdown {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .dropdown-toggle {
        width: 100%;
        justify-content: space-between;
        padding: 0.75rem 0;
    }
    
    .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        padding-left: 1rem;
        margin-top: 0;
        display: none;
        opacity: 1;
        transform: none;
        width: 100%;
    }
    
    .dropdown.open .dropdown-menu {
        display: block;
    }
}

/* Global Search Layout & Input Base */
.search-container {
    position: relative;
    max-width: 600px;
    margin: 2rem auto 0;
    display: flex;
    gap: 1rem;
}

.search-input {
    flex-grow: 1;
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1.125rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px var(--border-light);
    transition: all 0.2s ease;
    font-family: inherit;
}

.search-filter-audience {
    padding: 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background: white;
    font-family: inherit;
    color: var(--text-secondary);
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.search-filter-audience:focus {
    border-color: var(--swiss-red);
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-input:focus {
    outline: none;
    border-color: var(--swiss-red);
    box-shadow: 0 0 0 4px rgba(213, 43, 30, 0.1);
}