:root {
    --bg-color: #0d1117;
    --text-main: #ffffff;
    --text-dim: #d8d2d2;
    --text-dimmer: #8b949e;
    --card-bg: rgba(255, 255, 255, 0.03);
    --panel-bg: rgba(255, 255, 255, 0.02);
    --border-soft: rgba(255, 255, 255, 0.08);

    /* set per page */
    --accent: #38d9e6;
    --border-glow: rgba(56, 217, 230, 0.18);
    --accent-soft: rgba(56, 217, 230, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg-color);
    color: var(--text-dim);
    font-family: 'Inter', sans-serif;
    font-size: 1.08rem;
    line-height: 1.65;
    letter-spacing: 0.01rem;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.grid-master {
    position: fixed;
    inset: 0;
    background-image:
            linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
            linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: -1;
    opacity: 0.35;
}

.return-home {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: rgba(13, 17, 23, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-soft);
    display: flex;
    align-items: center;
    padding: 0 30px;
    z-index: 1000;
}

.return-home a {
    text-decoration: none;
    color: var(--text-dimmer);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    letter-spacing: 1px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

.return-home a:hover {
    color: var(--accent);
    text-shadow: 0 0 10px var(--border-glow);
}

.return-home .esc {
    border: 1px solid currentColor;
    padding: 2px 6px;
    border-radius: 3px;
}

.persona-nav {
    position: fixed;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.persona-nav a {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: block;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.persona-nav a:hover {
    transform: scale(1.15);
    filter: brightness(1.15);
}

.persona-nav .label {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.6rem;
    color: var(--text-dimmer);
    transform: rotate(90deg);
    margin-top: 16px;
    white-space: nowrap;
    letter-spacing: 2px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 100px 20px 80px;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-glow);
}

.badge {
    display: inline-block;
    margin-bottom: 20px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
    background: rgba(255,255,255,0.01);
}

h1 {
    margin: 0;
    font-family: 'Orbitron', sans-serif;
    font-size: 2.4rem;
    color: var(--text-main);
}

h2 {
    margin-top: 40px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.35rem;
    color: var(--accent);
}

h3 {
    margin-top: 0;
    font-family: 'Orbitron', sans-serif;
    color: var(--text-main);
    font-size: 1rem;
}

.sub {
    max-width: 720px;
    margin: 20px auto 0;
    color: #e6e6e6;
    font-size: 1.08rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 40px 0;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-soft);
    border-radius: 10px;
    padding: 26px;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--text-dim);
}

li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.step {
    margin-bottom: 24px;
}

.step strong {
    display: block;
    margin-bottom: 5px;
    color: var(--text-main);
    font-size: 1.15em;
}

.highlight {
    margin: 40px 0;
    padding: 22px;
    border-left: 4px solid var(--accent);
    background: var(--accent-soft);
    border-radius: 0 8px 8px 0;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 40px 0;
}

.metric {
    text-align: center;
    padding: 22px 18px;
    background: var(--accent-soft);
    border: 1px solid var(--border-glow);
    border-radius: 10px;
}

.metric-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 2rem;
    color: var(--text-main);
}

.metric-label {
    margin-top: 6px;
    font-size: 0.8rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.cta {
    text-align: center;
    margin-top: 80px;
}

.button-primary {
    display: inline-block;
    padding: 14px 30px;
    border-radius: 6px;
    background: var(--accent);
    color: #081018;
    text-decoration: none;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
}

.button-primary:hover {
    filter: brightness(1.05);
}

@media (max-width: 768px) {
    .grid, .metric-grid {
        grid-template-columns: 1fr;
    }

    .persona-nav {
        display: none;
    }

    .container {
        padding-top: 90px;
    }

    h1 {
        font-size: 2rem;
    }
}