:root {
    --bg: #080E17;
    --bg2: #0D1B2A;
    --border: #1B2F45;
    --cyan: #00C2E0;
    --gold: #FFD166;
    --green: #06D6A0;
    --red: #E63946;
    --text: #E8EDF2;
    --muted: #5A7A96;
    --card-bg: #121E2E;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.4), 0 8px 32px rgba(0,0,0,0.3), 0 1px 0 rgba(255,255,255,0.07) inset;
    --card-border: rgba(0,194,224,0.18);
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'Pretendard Variable', 'Pretendard', -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--sans); font-weight: 300; overflow-x: hidden; }

/* ── Navigation ── */
.site-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px 48px;
    background: rgba(8,14,23,0.9); backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-logo { text-decoration: none; display: flex; align-items: center; }
.nav-logo-img { height: 32px; width: auto; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a { color: var(--text); text-decoration: none; font-size: 16px; font-weight: 600; transition: color 0.2s; }
.nav-links a:hover { color: var(--cyan); }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.lang-switch { color: var(--muted); text-decoration: none; font-size: 13px; font-family: var(--mono); padding: 4px 8px; border-radius: 4px; }
.lang-switch.active { color: var(--cyan); background: rgba(0,194,224,0.1); }
.nav-cta {
    color: var(--bg); background: var(--cyan); padding: 10px 24px; border-radius: 6px;
    text-decoration: none; font-size: 14px; font-weight: 700; letter-spacing: 0.02em; transition: opacity 0.2s;
}
.nav-cta:hover { opacity: 0.9; }

/* ── Hamburger ── */
.nav-hamburger {
    display: none; flex-direction: column; justify-content: center; gap: 5px;
    width: 32px; height: 32px; background: none; border: none; cursor: pointer; padding: 4px; z-index: 110;
}
.hamburger-bar {
    display: block; width: 100%; height: 2px; background: var(--text);
    border-radius: 2px; transition: transform 0.3s, opacity 0.3s;
}
.nav-hamburger.active .hamburger-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.active .hamburger-bar:nth-child(2) { opacity: 0; }
.nav-hamburger.active .hamburger-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ── */
.hero {
    min-height: 80vh; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center;
    padding: 120px 24px 40px;
}
.hero-logo { font-family: var(--mono); font-size: clamp(56px, 8vw, 96px); font-weight: 700; letter-spacing: 0.15em; color: var(--text); }
.hero-logo .accent { color: var(--cyan); }
.hero-badge {
    display: inline-block; margin-top: 16px; padding: 6px 20px;
    font-family: var(--mono); font-size: 13px; font-weight: 700; letter-spacing: 0.15em;
    color: var(--green); border: 1.5px solid rgba(6,214,160,0.4); border-radius: 20px;
    background: rgba(6,214,160,0.08);
}
.hero-subtitle { font-family: var(--mono); font-size: clamp(14px, 1.8vw, 20px); letter-spacing: 0.06em; color: var(--muted); margin-top: 20px; }
.hero-title { font-size: clamp(22px, 3vw, 36px); font-weight: 700; line-height: 1.4; margin-top: 24px; max-width: 700px; }

/* ── Console Button ── */
.btn-console {
    display: inline-flex; align-items: center; gap: 10px;
    margin-top: 40px; padding: 18px 48px;
    background: linear-gradient(135deg, var(--cyan), #0090B0);
    color: #fff; font-size: 20px; font-weight: 800; letter-spacing: 0.04em;
    border-radius: 10px; text-decoration: none;
    box-shadow: 0 4px 20px rgba(0,194,224,0.3), 0 0 60px rgba(0,194,224,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn-console:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(0,194,224,0.4), 0 0 80px rgba(0,194,224,0.15);
}
.btn-console--secondary {
    background: linear-gradient(135deg, var(--green), #00A080);
    box-shadow: 0 4px 20px rgba(6,214,160,0.3), 0 0 60px rgba(6,214,160,0.1);
}
.btn-console--secondary:hover {
    box-shadow: 0 6px 28px rgba(6,214,160,0.4), 0 0 80px rgba(6,214,160,0.15);
}

/* ── Guide ── */
.guide {
    max-width: 720px; margin: 0 auto; padding: 0 24px 80px;
}
.guide-card {
    background: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 16px; padding: 40px; box-shadow: var(--card-shadow);
    border-top: 1px solid rgba(255,255,255,0.12);
}
.guide-credentials {
    text-align: center; padding-bottom: 28px; margin-bottom: 28px;
    border-bottom: 1px solid var(--border);
}
.guide-label {
    font-family: var(--mono); font-size: 12px; font-weight: 700;
    color: var(--cyan); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 14px;
}
.guide-account {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    font-size: 18px;
}
.guide-field { color: var(--muted); font-size: 13px; font-weight: 600; }
.guide-account code {
    font-family: var(--mono); font-size: 20px; font-weight: 700; color: var(--text);
    background: rgba(0,194,224,0.08); padding: 4px 14px; border-radius: 6px;
    border: 1px solid rgba(0,194,224,0.15);
}
.guide-divider { color: var(--border); }

.guide-features { margin-bottom: 24px; }
.guide-features h3 {
    font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 18px;
}
.guide-features ul { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.guide-features li {
    display: flex; flex-direction: column; gap: 3px;
    padding: 14px 18px; background: rgba(0,194,224,0.03);
    border-left: 3px solid rgba(0,194,224,0.4); border-radius: 0 8px 8px 0;
}
.guide-features li strong { font-size: 15px; font-weight: 700; color: var(--cyan); }
.guide-features li span { font-size: 14px; color: var(--muted); line-height: 1.5; }

.guide-note {
    text-align: center; font-size: 13px; color: var(--muted);
    padding-top: 20px; border-top: 1px solid var(--border);
}

/* ── Footer ── */
.site-footer {
    padding: 40px 48px 24px; border-top: 1px solid var(--border);
}
.footer-inner { max-width: 720px; margin: 0 auto; text-align: center; }
.footer-logo { font-family: var(--mono); font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: 0.1em; margin-bottom: 8px; }
.footer-logo span { color: var(--cyan); }
.footer-inner > p { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 20px; }
.footer-links a { color: var(--muted); text-decoration: none; font-size: 13px; transition: color 0.2s; }
.footer-links a:hover { color: var(--text); }
.footer-copy { font-size: 12px; color: var(--muted); }

/* ── Animations ── */
.fade-in-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive: Tablet ── */
@media (max-width: 960px) {
    .site-nav { padding: 14px 28px; }
    .guide-card { padding: 32px 24px; }
}

/* ── Responsive: Mobile ── */
@media (max-width: 768px) {
    .site-nav { padding: 12px 20px; }
    .nav-hamburger { display: flex; }
    .nav-links {
        display: none; position: fixed; top: 56px; left: 0; right: 0;
        flex-direction: column; gap: 0; background: rgba(8,14,23,0.98);
        backdrop-filter: blur(16px); border-bottom: 1px solid var(--border);
        padding: 16px 0; z-index: 99;
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 14px 24px; font-size: 16px; }
    .nav-actions .nav-cta { display: none; }
    .nav-actions { gap: 8px; }
    .hero { padding: 100px 20px 32px; min-height: 60vh; }
    .hero-logo { font-size: clamp(40px, 10vw, 64px); }
    .btn-console { padding: 16px 36px; font-size: 18px; }
    .guide { padding: 0 16px 60px; }
    .guide-card { padding: 28px 20px; }
    .guide-account { flex-wrap: wrap; }
    .footer-links { flex-wrap: wrap; gap: 16px; }
}