/* ===========================
   GLOBAL THEME VARIABLES
   =========================== */

:root {
    --bg-dark: #0a0f14;
    --bg-panel: #111820;
    --text-light: #e6f1ff;
    --text-navbar: #e6f1ff;
    --text-dim: #8aa0b8;
    --accent: #00eaff;
    --accent-glow: 0 0 12px #00eaff, 0 0 24px #00eaff;
    --border-panel: #00eaff33;
    --tag-border: #00eaff66;
    --shadow: #00eaff99;
    --bg_nav: #0a0f14e6;
    --radius: 8px;
    --transition: 0.25s ease;
    --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-title: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --bg-grid: url('../images/grid.jpg');
}

:root.light {
    --bg-dark: #f5f7fa;
    --bg-panel: #ffffff;
    --text-light: #1a1a1a;
    --text-navbar: #e6f1ff;
    --text-dim: #555;
    --accent: #0077cc;
    --accent-glow: 0 0 8px #0077cc, 0 0 16px #0077cc;
    --bg-grid: url('../images/grid-light.jpg');
}

/* ===========================
   RESET + BODY
   =========================== */

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

body {
    background: var(--bg-dark);
    color: var(--text-light);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: var(--bg-grid);
    opacity: 0.08;
    pointer-events: none;
    z-index: -1;
}

/* ===========================
   NAVBAR
   =========================== */

nav {
    width: 100%;
    padding: 20px 40px;
    background: var(--bg_nav);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-panel);
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-logo {
    margin-left: 30px;
    font-family: var(--font-title);
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--accent);
    text-shadow: var(--accent-glow);
}

nav a {
    color: var(--text-navbar);
    text-decoration: none;
    margin-left: 24px;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

nav a:hover {
    color: var(--accent);
    text-shadow: var(--accent-glow);
}

/* ===========================
   HERO (GLOBAL)
   =========================== */

.hero {
    padding: 120px 40px 60px;
    text-align: center;
}

.hero h1 {
    font-family: var(--font-title);
    font-size: 3.2rem;
    color: var(--accent);
    text-shadow: var(--accent-glow);
}

.hero h2 {
    margin-top: 10px;
    font-size: 1.4rem;
    color: var(--text-light);
}

.hero p {
    margin-top: 20px;
    font-size: 1.05rem;
    color: var(--text-dim);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

/* ===========================
   GRID UTILITIES
   =========================== */

.grid {
    display: grid;
    gap: 24px;
}

.grid-3 {    
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* ===========================
   FOOTER
   =========================== */

footer {
    text-align: center;
    padding: 40px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

/* ===========================
   RESPONSIVE
   =========================== */

@media (max-width: 768px) {
    nav {
        padding: 16px 20px;
    }
    .hero {
        padding: 100px 20px 40px;
    }
}