@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700&family=Inter:wght@400;600&family=Fjalla+One&display=swap');

:root {
    /* --- Palette --- */
    --color-bg-deep: #0d0f1a;
    --color-bg-mid: #15192d;
    --color-surface: #161B22; /* For cards/sections */
    --color-accent: #518eee; /* Tech Blue */
    --color-accent-hover: #79a7ff;
    --color-accent-glow: rgba(81, 142, 238, 0.3);
    --color-text-primary: #e8edf3;
    --color-text-secondary: #b0c7e0;
    --color-border-subtle: rgba(81, 142, 238, 0.2);
    --color-border-strong: rgba(81, 142, 238, 0.4);
    --color-nav-bg: rgba(13, 16, 23, 0.7);
    --color-shadow: rgba(0, 0, 0, 0.4);

    /* --- Fonts --- */
    --font-display: 'Roboto', sans-serif;
    --font-sans: 'Roboto', sans-serif;
    --font-tech: 'Roboto', sans-serif;

    /* --- Structure --- */
    --radius-main: 16px;
    --radius-card: 12px;
    --transition: 0.3s ease-out;
}

/* === Base & Body === */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: linear-gradient(170deg, var(--color-bg-deep) 0%, var(--color-bg-mid) 70%);
    color: var(--color-text-primary);
    line-height: 1.7;
    padding: 1rem;
    padding-top: 80px; /* Nav space */
    min-height: 100vh;
    background-attachment: fixed;
}
body::after { /* Cyber Grid Overlay */
    content: ''; position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    background-image:
        linear-gradient(rgba(81, 142, 238, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(81, 142, 238, 0.04) 1px, transparent 1px);
    background-size: 30px 30px; pointer-events: none; z-index: -1;
}

/* === Typography === */
h1, h2, h3 { font-family: var(--font-tech); color: var(--color-text-primary); margin-bottom: 1.5rem; line-height: 1.3; }
h1 { font-size: clamp(2.8rem, 6vw, 4rem); color: var(--color-accent); text-shadow: 0 0 15px var(--color-accent-glow); border-bottom: 2px solid var(--color-border-strong); padding-bottom: 1rem; text-align: center; }
h2 { font-size: clamp(2rem, 4vw, 2.8rem); border-bottom: 2px solid var(--color-border-subtle); padding-bottom: 0.75rem; margin-top: 3.5rem; }
h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); color: var(--color-accent); }
p, li { color: var(--color-text-secondary); font-size: 1.05rem; margin-bottom: 1.2rem; }
a { color: var(--color-accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-accent-hover); }

/* === Navigation === */
.top-nav {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    position: fixed; top: 0; left: 0; padding: 0.8rem 2.5rem;
    background-color: var(--color-nav-bg);
    box-shadow: 0 2px 10px var(--color-shadow); z-index: 1000;
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.top-nav a { color: var(--color-text-secondary); font-weight: 600; font-size: 0.95rem; }
.top-nav a.nav-left { font-family: var(--font-display); font-size: 1.4rem; color: var(--color-accent); }
.top-nav a:hover { color: #fff; }
.nav-right { display: flex; gap: 1.8rem; }
.back-button { /* General back button */
    position: fixed; top: 1.2rem; left: 2.5rem; color: var(--color-accent);
    font-size: 1.6rem; z-index: 1001; transition: var(--transition);
    background: var(--color-surface); padding: 0.4rem 1rem; border-radius: 8px;
    border: 1px solid var(--color-border-subtle); font-weight: bold;
}
.back-button:hover { transform: translateX(-5px) scale(1.05); box-shadow: 0 0 10px var(--color-accent-glow); }

/* === Layout & Cards === */
.page-container { max-width: 1100px; margin: 2rem auto; padding: 0 1rem; }
.content-section, .content-card {
    background-color: var(--color-surface); padding: 2.5rem;
    border-radius: var(--radius-card); box-shadow: 0 8px 25px var(--color-shadow);
    border: 1px solid var(--color-border-subtle); transition: var(--transition);
    margin-bottom: 2.5rem;
}
.content-section:hover, .content-card:hover {
    transform: translateY(-5px); border-color: var(--color-border-strong);
    box-shadow: 0 12px 35px var(--color-shadow), 0 0 20px var(--color-accent-glow);
}

/* === Responsive === */
@media (max-width: 768px) {
    body { padding-top: 70px; }
    .top-nav { padding: 0.7rem 1.5rem; }
    .nav-right { display: none; }
    .back-button { top: 1rem; left: 1.5rem; font-size: 1.3rem; padding: 0.3rem 0.8rem; }
    h1 { font-size: 2.5rem; } h2 { font-size: 1.8rem; }
    .content-section, .content-card { padding: 1.5rem; }
}