/* ==============================================================================
# PHAETHONOS - LANDING PAGE STYLESHEET (styles.css)
# ==============================================================================
# Implements a premium, stunning dark-mode visual interface matching the
# Zenless Zone Zero graphic styling: pure black, neon lime highlights,
# sharp 90-degree rectangle layouts, and wide Barlow Condensed headers.
*/

/* --- 1. GLOBAL ROOT VARIABLES & RESET --- */
:root {
    --color-bg: #0a0a0a;
    --color-card-bg: #111111;
    --color-accent: #c8ff00; /* Neon Lime-yellow */
    --color-white: #ffffff;
    --color-muted: #888888;
    --color-outline: #222222;
    --font-heading: 'Barlow Condensed', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- 2. HEADER NAVIGATION --- */
#main-header {
    background-color: rgba(10, 10, 10, 0.95);
    border-bottom: 2px solid var(--color-outline);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-symbol {
    width: 28px;
    height: 28px;
    background-color: var(--color-accent);
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

.brand-name {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 24px;
    letter-spacing: 1.5px;
    color: var(--color-white);
}

.brand-name span {
    color: var(--color-accent);
}

#nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-white);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 1px;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-accent);
}

/* --- 3. HERO SECTION --- */
#hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    border-bottom: 2px solid var(--color-outline);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 75% 50%, rgba(200, 255, 0, 0.05), transparent 60%);
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-badge {
    background-color: var(--color-accent);
    color: var(--color-bg);
    display: inline-block;
    padding: 6px 14px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 1px;
    margin-bottom: 24px;
    border-radius: 0px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 54px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 2px;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.hero-title span {
    color: var(--color-accent);
}

.hero-subtitle {
    color: var(--color-muted);
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.action-btn {
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 1px;
    padding: 14px 36px;
    transition: all 0.2s ease;
    border-radius: 0px;
}

.primary-btn {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border: 2px solid var(--color-accent);
}

.primary-btn:hover {
    background-color: #d4ff33;
    border-color: #d4ff33;
}

.secondary-btn {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.secondary-btn:hover {
    background-color: var(--color-white);
    color: var(--color-bg);
}

/* --- 4. FEATURES SECTION --- */
#features {
    padding: 100px 0;
    border-bottom: 2px solid var(--color-outline);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.sub-title {
    color: var(--color-accent);
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: 1.5px;
    font-size: 14px;
    display: block;
    margin-bottom: 8px;
}

.main-heading {
    font-family: var(--font-heading);
    font-size: 38px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--color-card-bg);
    border: 2px solid var(--color-outline);
    padding: 40px 32px;
    transition: border-color 0.2s ease;
    border-radius: 0px;
}

.feature-card:hover {
    border-color: var(--color-accent);
}

.card-title {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 16px;
    color: var(--color-white);
}

.card-text {
    color: var(--color-muted);
    font-size: 14px;
}

/* --- 5. SPECS SECTION --- */
#specs {
    padding: 100px 0;
}

.specs-box {
    max-width: 700px;
    margin: 0 auto;
    border: 2px solid var(--color-outline);
    border-radius: 0px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-outline);
}

.spec-row:last-child {
    border-bottom: none;
}

.spec-label {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 1px;
    color: var(--color-muted);
}

.spec-val {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-white);
}

/* --- 6. FOOTER --- */
#main-footer {
    border-top: 2px solid var(--color-outline);
    padding: 40px 24px;
    text-align: center;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.epitaph {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 1px;
    color: var(--color-accent);
}

.copyright {
    color: var(--color-muted);
    font-size: 13px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #nav-menu {
        display: none;
    }
    .hero-title {
        font-size: 38px;
    }
    .hero-actions {
        flex-direction: column;
    }
}