@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&display=swap');

:root {
    /* Color System: JournalsHarvezx Premium */
    --primary-bg: #0F172A; /* Midnight Navy */
    --dark-surface: #1E293B; /* Slightly lighter navy */
    --editorial-paper: #F8FAFC; /* Soft Ivory */
    --deep-slate: #172554;
    --gold-accent: #D4AF37; /* Antique Gold */
    --soft-gold: #E2C56A;
    --signal-blue: #1D4ED8; /* Royal Blue */
    --natural-green: #10B981; /* Emerald Green */
    --muted-text: #94A3B8;
    --border-color: #334155;
    --text-main: #F8FAFC;
    --text-dark: #0F172A;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Layout */
    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--primary-bg);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: #ffffff;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; font-family: var(--font-body); font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gold-accent); }

p { margin-bottom: var(--spacing-sm); color: var(--muted-text); }
a { color: var(--gold-accent); text-decoration: none; transition: var(--transition-fast); }
a:hover { color: var(--soft-gold); }

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section { padding: var(--spacing-xl) 0; }
.section-sm { padding: var(--spacing-lg) 0; }

.grid { display: grid; gap: var(--spacing-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-asym-right { grid-template-columns: 1fr 2fr; }
.grid-asym-left { grid-template-columns: 2fr 1fr; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary {
    background-color: var(--gold-accent);
    color: var(--primary-bg);
}
.btn-primary:hover { background-color: var(--soft-gold); }

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-main);
}
.btn-outline:hover {
    border-color: var(--gold-accent);
    color: var(--gold-accent);
}

/* Header & Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-fast);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    transition: var(--transition-fast);
}

.logo:hover {
    opacity: 0.9;
}

.logo svg {
    display: block;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-main);
    font-size: 0.875rem;
    font-weight: 500;
}
.main-nav a:hover, .main-nav a.active { color: var(--gold-accent); }

.mobile-menu-btn { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

/* Hero Section */
.hero {
    padding-top: calc(80px + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    background: radial-gradient(circle at top right, var(--deep-slate), var(--primary-bg));
}
.hero-content { max-width: 800px; }
.hero-subtitle { font-family: var(--font-body); font-size: 1.125rem; color: var(--muted-text); margin-bottom: var(--spacing-md); max-width: 600px; }

/* Editorial Paper Section (Light) */
.section-light {
    background-color: var(--editorial-paper);
    color: var(--text-dark);
}
.section-light h2, .section-light h3, .section-light h1 { color: var(--text-dark); }
.section-light p { color: #4B5563; }
.section-light .border-top { border-top: 1px solid #D1D5DB; }

/* UI Components */
.card {
    background-color: var(--dark-surface);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    transition: var(--transition-medium);
}
.card:hover { border-color: var(--gold-accent); }
.card-light { background-color: #fff; border: 1px solid #E5E7EB; }

.number-label {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--gold-accent);
    margin-bottom: var(--spacing-xs);
}

.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0; width: 1px;
    background-color: var(--border-color);
}
.timeline-item { position: relative; margin-bottom: var(--spacing-md); }
.timeline-item::before {
    content: ''; position: absolute; left: -2.35rem; top: 0.5rem;
    width: 0.75rem; height: 0.75rem; border-radius: 50%;
    background-color: var(--primary-bg); border: 2px solid var(--gold-accent);
}

/* Challenge Selector */
.selector-tabs { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.selector-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--dark-surface);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
}
.selector-tab.active, .selector-tab:hover { background-color: var(--deep-slate); border-color: var(--signal-blue); }
.selector-content-area { padding: var(--spacing-md); border: 1px solid var(--border-color); background-color: var(--dark-surface); }
.selector-panel { display: none; }
.selector-panel.active { display: block; animation: fadeIn 0.5s; }

/* Tables */
.comparison-table { width: 100%; border-collapse: collapse; margin-top: var(--spacing-md); }
.comparison-table th, .comparison-table td { padding: var(--spacing-sm); text-align: left; border-bottom: 1px solid var(--border-color); }
.comparison-table th { font-family: var(--font-heading); color: var(--gold-accent); font-weight: normal; }

/* Forms */
.form-group { margin-bottom: var(--spacing-sm); }
.form-label { display: block; margin-bottom: var(--spacing-xs); font-size: 0.875rem; color: var(--muted-text); }
.form-control {
    width: 100%; padding: 0.75rem; background-color: var(--dark-surface);
    border: 1px solid var(--border-color); color: var(--text-main);
    font-family: var(--font-body);
}
.form-control:focus { outline: none; border-color: var(--gold-accent); }
textarea.form-control { min-height: 150px; resize: vertical; }

/* Accordion */
.accordion-item { border-bottom: 1px solid var(--border-color); }
.accordion-header {
    width: 100%; padding: var(--spacing-sm) 0; background: none; border: none;
    color: #fff; text-align: left; font-size: 1.125rem; font-family: var(--font-heading);
    cursor: pointer; display: flex; justify-content: space-between; align-items: center;
}
.accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.3s ease-out; }
.accordion-inner { padding-bottom: var(--spacing-sm); color: var(--muted-text); }
.accordion-item.active .accordion-content { max-height: 500px; }

/* Image Placeholders / Semantic representations */
.img-placeholder {
    width: 100%; height: auto; display: block; background-color: var(--deep-slate);
    border: 1px solid var(--border-color); aspect-ratio: 16/9;
}
.img-editorial { aspect-ratio: 4/5; }

/* Footer */
.site-footer {
    background-color: var(--primary-bg); border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--spacing-md); margin-bottom: var(--spacing-md); }
.footer-title { margin-bottom: var(--spacing-sm); display: block; }
.footer-title svg { display: block; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: var(--spacing-xs); }
.footer-links a { color: var(--muted-text); font-size: 0.875rem; }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: var(--spacing-sm); display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--muted-text); }

/* Cookie Banner */
.cookie-banner {
    position: fixed; bottom: 0; left: 0; width: 100%;
    background-color: var(--dark-surface); border-top: 1px solid var(--border-color);
    padding: var(--spacing-md); z-index: 9999; transform: translateY(100%); transition: transform 0.5s ease;
}
.cookie-banner.show { transform: translateY(0); }
.cookie-content { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--spacing-sm); }
.cookie-buttons { display: flex; gap: var(--spacing-xs); flex-wrap: wrap; }

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s ease-out; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1200px) {
    .container { padding: 0 var(--spacing-sm); }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .grid-2, .grid-3, .grid-4, .grid-asym-right, .grid-asym-left { grid-template-columns: 1fr; }
    .header-inner { height: 60px; }
    .main-nav {
        position: fixed; top: 60px; left: -100%; width: 100%; height: calc(100vh - 60px);
        background-color: var(--primary-bg); flex-direction: column; padding: var(--spacing-md);
        transition: left 0.3s ease; border-top: 1px solid var(--border-color);
    }
    .main-nav.active { left: 0; }
    .main-nav ul { flex-direction: column; gap: 1rem; }
    .mobile-menu-btn { display: block; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}

@media (max-width: 480px) {
    .section { padding: var(--spacing-lg) 0; }
    .cookie-buttons { flex-direction: column; }
    .btn { width: 100%; }
}