/* 
   Project: skaftafellicecave.org
   Theme: Crystal & Crevasse (High-Tech, Cold, Authoritative)
*/

:root {
    --electric-blue: #00d4ff;
    --deep-obsidian: #0a192f;
    --snow-white: #ffffff;
    --glacier-grey: #607d8b;
    --ice-shadow: rgba(0, 212, 255, 0.2);
    --text-dark: #1a202c;
    --text-light: #f8fafc;
    --nav-bg: rgba(10, 25, 47, 0.95);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #f1f5f9;
}

h1,
h2,
h3 {
    font-family: 'Outfit', sans-serif;
    color: var(--deep-obsidian);
    font-weight: 800;
    letter-spacing: -0.025em;
}

a {
    color: var(--electric-blue);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #40e4ff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* --- Navigation --- */

nav {
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--snow-white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo span {
    color: var(--electric-blue);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
}

.nav-links a:hover {
    color: var(--electric-blue);
}

/* --- Hero --- */

.hero {
    padding: 120px 0;
    background: linear-gradient(rgba(10, 25, 47, 0.6), rgba(10, 25, 47, 0.6)), url('images/skaftafell-ice-cave-hero.webp') center/cover;
    color: var(--snow-white);
    text-align: center;
    border-bottom: 4px solid var(--electric-blue);
}

.hero h1 {
    color: white;
    font-size: 4rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 10px var(--ice-shadow));
}

.hero p {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto 3rem;
    color: rgba(255, 255, 255, 0.9);
}

/* --- Sections --- */

section {
    padding: 100px 0;
}

.bg-dark {
    background: var(--deep-obsidian);
    color: var(--snow-white);
}

.bg-dark h2,
.bg-dark h3 {
    color: var(--snow-white);
}

.section-title {
    text-align: center;
    margin-bottom: 4.5rem;
}

.section-title h2 {
    font-size: 2.5rem;
    position: relative;
    display: inline-block;
    padding-bottom: 0.75rem;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20%;
    width: 60%;
    height: 4px;
    background: var(--electric-blue);
    border-radius: 2px;
}

/* --- Buttons --- */

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--electric-blue);
    color: var(--deep-obsidian);
    box-shadow: 0 4px 15px var(--ice-shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--ice-shadow);
    background: #40e4ff;
}

.btn-outline {
    border: 2px solid var(--electric-blue);
    color: var(--electric-blue);
}

.btn-outline:hover {
    background: var(--electric-blue);
    color: var(--deep-obsidian);
}

/* --- Cards --- */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.card {
    background: white;
    padding: 3rem;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--electric-blue);
}

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

/* --- Info/Alert Boxes --- */

.safety-summary {
    background: #e0f2fe;
    border-radius: 12px;
    padding: 2.5rem;
    border-left: 8px solid var(--electric-blue);
    margin: 3rem 0;
}

.alert-red {
    background: #fef2f2;
    border-left: 8px solid #ef4444;
    padding: 2rem;
    margin: 2rem 0;
    color: #991b1b;
}

/* --- Comparison Tables --- */

.comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 3rem 0;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.05);
}

.comparison-table th {
    background: var(--deep-obsidian);
    color: white;
    padding: 1.5rem;
    text-align: left;
    font-weight: 700;
}

.comparison-table td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid #edf2f7;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover td {
    background: #f8fafc;
}

/* --- Footer --- */

footer {
    background: #020617;
    color: rgba(255, 255, 255, 0.6);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

footer h4 {
    color: var(--snow-white);
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 1rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
}

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

.copyright {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    font-size: 0.9rem;
}

/* --- Responsive --- */

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

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