/* ===========================
   DESIGN SYSTEM — CUBE‑16
   =========================== */

/* --- VARIABLES --- */
:root {
    --color-bg: #0b0d10;
    --color-bg-alt: #0f1115;
    --color-bg-soft: #1a1d22;

    --color-text: #e6f1ff;
    --color-text-soft: #c9d4e2;

    --color-blue: #008cff;
    --color-purple: #9b4dff;

    --color-border: rgba(255,255,255,0.08);
    --color-border-strong: rgba(255,255,255,0.15);

    --color-glass: rgba(255,255,255,0.03);

    --shadow-glow: 0 0 22px rgba(0,140,255,0.55);
    --shadow-glow-strong: 0 0 32px rgba(0,140,255,0.85);

    --radius-s: 6px;
    --radius-m: 12px;
    --radius-l: 18px;

    --space-xs: 4px;
    --space-s: 8px;
    --space-m: 16px;
    --space-l: 24px;
    --space-xl: 40px;

    --max-width: 1200px;
}

/* --- RESET & TYPO --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
}

h1, h2, h3, h4 {
    margin: 0 0 var(--space-m);
    font-weight: 600;
    letter-spacing: 0.03em;
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.4rem; }

p { margin: 0 0 var(--space-m); }

a {
    color: var(--color-blue);
    text-decoration: none;
    transition: 0.25s;
}

a:hover {
    color: var(--color-purple);
}

/* --- LAYOUT --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: 60px 0;
}

.section-dark {
    background: radial-gradient(circle at top, var(--color-bg-soft), var(--color-bg));
}

.section-alt {
    background: linear-gradient(135deg, var(--color-bg), var(--color-bg-alt));
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: 0.25s;
    border: 1px solid var(--color-border-strong);
    background: linear-gradient(135deg, #14171c, #1a1d22);
    color: var(--color-text);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-blue), var(--color-purple));
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow-strong);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    border-color: var(--color-border-strong);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.04);
}

/* --- CARDS --- */
.card {
    background: radial-gradient(circle at top left, rgba(0,140,255,0.18), rgba(0,0,0,0.9));
    border-radius: var(--radius-l);
    padding: var(--space-l);
    border: 1px solid var(--color-border);
    box-shadow: 0 18px 40px rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
}

.card-soft {
    background: var(--color-glass);
    border-radius: var(--radius-m);
    padding: var(--space-m);
    border: 1px solid var(--color-border);
}

/* --- HERO --- */
.hero {
    padding: 80px 0 60px;
    background: radial-gradient(circle at top, rgba(0,140,255,0.35), var(--color-bg));
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

.hero-title {
    font-size: 2.6rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-soft);
    max-width: 480px;
}

.hero-actions {
    margin-top: var(--space-m);
    display: flex;
    gap: var(--space-m);
}

/* --- FOOTER --- */
.cube16-footer {
    padding: var(--space-l) var(--space-xl);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: #8f9bb0;
    text-align: center;
}

/* --- UTILITIES --- */
.text-center { text-align: center; }
.text-right  { text-align: right; }

.mt-s { margin-top: var(--space-s); }
.mt-m { margin-top: var(--space-m); }
.mt-l { margin-top: var(--space-l); }

.mb-s { margin-bottom: var(--space-s); }
.mb-m { margin-bottom: var(--space-m); }
.mb-l { margin-bottom: var(--space-l); }

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-xl);
}

@media (max-width: 900px) {
    .hero-inner,
    .grid-2 {
        grid-template-columns: 1fr;
    }
}