:root {
    --bg-color: #0F1115;
    --surface-primary: #171A21;
    --surface-secondary: #1D212A;
    --border-color: #2A303A;
    --text-primary: #F5F7FA;
    --text-secondary: #A5AFBC;
    --text-muted: #727C8A;
    --accent: #6FAE8E;
    --accent-hover: #86C8A1;
    --warning: #D5A04D;
    --error: #D56C6C;
    
    --radius-md: 12px;
    --radius-lg: 16px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    
    /* Ensure body fills viewport to support single scroll view */
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease, transform 0.2s ease;
}

/* Main Content Area */
main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px 0;
}

/* Hero Section */
.hero {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px 64px;
    text-align: center;
}

.hero-content {
    max-width: 720px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 8px;
}

.hero-author {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    color: var(--text-muted);
    font-weight: 500;
}

/* Portals Section */
.portals {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

.portal-grid {
    display: grid;
    /* 5 columns on desktop for one-scroll fit */
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.portal-card {
    display: flex;
    flex-direction: column;
    background-color: var(--surface-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease, background-color 200ms ease;
    height: 100%;
}

.portal-card:hover, .portal-card:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    border-color: var(--text-muted);
    background-color: var(--surface-secondary);
    outline: none;
}

.portal-info {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.portal-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 12px;
}

.portal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.portal-credit {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.portal-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    flex-grow: 1;
    line-height: 1.5;
}

.portal-action {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: color 200ms ease;
    margin-top: auto;
}

.portal-card:hover .portal-action, .portal-card:focus-visible .portal-action {
    color: var(--accent);
}

/* Responsive Adjustments */
@media (max-width: 1200px) {
    .portal-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    /* Better Phone Layout */
    .portal-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .hero {
        padding: 0 20px 48px;
    }
}