:root {
    --bg: #f7f8fb;
    --surface: #ffffff;
    --ink: #0f172a;
    --muted: #64748b;
    --brand: #1a5fb4;
    --brand-2: #6c5ce7;
    --accent: #00d4aa;
    --dark: #0b1220;
    --dark-2: #111c33;
    --border: #e2e8f0;
    --danger: #b91c1c;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: none; opacity: 0.85; }

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(11, 18, 32, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #fff;
}

.site-header .container {
    display: flex;
    align-items: center;
    height: 64px;
    gap: 1.5rem;
}

.logo { margin: 0; font-size: 1.15rem; font-weight: 700; letter-spacing: 0.02em; }
.logo a { color: #fff; }
.logo .dot { color: var(--accent); }

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
}

.site-nav a {
    color: #cbd5e1;
    padding: 0.45rem 0.8rem;
    border-radius: 8px;
    font-size: 0.92rem;
    font-weight: 500;
    transition: color 0.15s, background 0.15s;
}

.site-nav a:hover { color: #fff; background: rgba(255, 255, 255, 0.08); opacity: 1; }

.nav-auth { display: flex; align-items: center; gap: 0.5rem; margin-left: 0.75rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.1rem;
    border-radius: 9px;
    border: 0;
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.12s, box-shadow 0.15s, background 0.15s;
}

.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; }
.btn-primary:hover { box-shadow: 0 6px 18px rgba(26, 95, 180, 0.4); transform: translateY(-1px); opacity: 1; }
.btn-ghost { background: transparent; color: #e2e8f0; border: 1px solid rgba(255, 255, 255, 0.35); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); opacity: 1; }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2); opacity: 1; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }

.nav-toggle {
    display: none;
    background: none;
    border: 0;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: auto;
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 6rem 0 4.5rem;
    color: #fff;
    background: radial-gradient(1000px 500px at 15% -10%, rgba(26, 95, 180, 0.55), transparent 60%),
                radial-gradient(900px 480px at 85% 10%, rgba(108, 92, 231, 0.5), transparent 60%),
                linear-gradient(160deg, #0b1220, #0f1c38 55%, #0b1220);
    overflow: hidden;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero h2 {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 5vw, 3.4rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.hero h2 .grad {
    background: linear-gradient(90deg, var(--accent), #7dd3fc);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    margin: 0 0 2rem;
    max-width: 560px;
    color: #cbd5e1;
    font-size: 1.08rem;
}

.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* ---------- Stats bar ---------- */
.stats {
    margin-top: -2rem;
    position: relative;
    z-index: 2;
}

.stats .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.stat { text-align: center; }
.stat .num { font-size: 1.5rem; font-weight: 800; color: var(--ink); letter-spacing: -0.02em; }
.stat .num small { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.stat .label { font-size: 0.82rem; color: var(--muted); margin-top: 0.15rem; }

/* ---------- Sections ---------- */
.section { padding: 3.5rem 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--border); }

.section-title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 0 0 0.35rem;
}

.section-sub { color: var(--muted); margin: 0 0 1.75rem; max-width: 640px; }

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.1rem;
}

.card {
    display: block;
    padding: 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--ink);
    transition: transform 0.15s, box-shadow 0.2s, border-color 0.15s;
}

.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand); opacity: 1; }
.card .icon { font-size: 1.6rem; margin-bottom: 0.6rem; }
.card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; font-weight: 700; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

/* ---------- Board / detail ---------- */
.board-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }

.board { width: 100%; border-collapse: collapse; }
.board th, .board td { padding: 0.8rem 1rem; border-bottom: 1px solid var(--border); text-align: left; }
.board th { background: #f8fafc; font-size: 0.82rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.board td { font-size: 0.94rem; }
.board tr:last-child td { border-bottom: 0; }
.board a { color: var(--brand); font-weight: 600; }
.board .col-id { width: 60px; }
.board .col-type { width: 90px; }
.board .col-date { width: 120px; color: var(--muted); }
.board .col-action { width: 80px; }

.empty { text-align: center; color: var(--muted); padding: 2.5rem 1rem; }

.post { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; }
.post h3 { margin: 0 0 0.5rem; font-size: 1.4rem; }
.post .meta { color: var(--muted); font-size: 0.88rem; margin-bottom: 1.5rem; }
.post .content { white-space: pre-wrap; margin-bottom: 1.5rem; }

/* ---------- Forms ---------- */
.page { padding: 3rem 0; }
.page h2 { font-size: 1.8rem; font-weight: 800; letter-spacing: -0.02em; margin: 0 0 1rem; }

.auth-box {
    max-width: 430px;
    margin: 2.5rem auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.2rem;
}

.auth-box h2 { text-align: center; margin-bottom: 1.5rem; }
.auth-box .hint { text-align: center; color: var(--muted); font-size: 0.88rem; margin: 1rem 0 0; }

.form-field { margin-bottom: 1.1rem; }
.form-field label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 0.35rem; }
.form-field input, .form-field textarea, .form-field select {
    width: 100%;
    padding: 0.65rem 0.8rem;
    border: 1px solid #cbd5e1;
    border-radius: 9px;
    font-family: var(--font);
    font-size: 0.95rem;
    background: #fff;
    color: var(--ink);
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.15);
}
.form-field .help { font-size: 0.8rem; color: var(--muted); margin-top: 0.3rem; }

.alert { padding: 0.75rem 1rem; border-radius: 9px; font-size: 0.9rem; margin-bottom: 1rem; }
.alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }

.actions { margin: 1rem 0; display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.site-footer {
    margin-top: 3rem;
    background: var(--dark);
    color: #94a3b8;
}

.site-footer .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    padding-block: 2.5rem;
}

.footer-col h4 { color: #e2e8f0; margin: 0 0 0.8rem; font-size: 0.95rem; }
.footer-col a { display: block; color: #94a3b8; font-size: 0.9rem; padding: 0.18rem 0; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 1rem 0; text-align: center; font-size: 0.85rem; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .nav-toggle { display: inline-block; }

    .site-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--dark-2);
        padding: 0.5rem 1rem 1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .site-nav.open { display: flex; }
    .site-nav a { padding: 0.7rem 0.6rem; }
    .nav-auth { margin: 0.5rem 0 0; }
    .nav-auth .btn { width: 100%; }
    .cards { grid-template-columns: 1fr; }
    .hero { padding: 4rem 0 3.5rem; }
    .stats { margin-top: -1.5rem; }
    .stats .grid { padding: 1rem; }
}

/* 상세·목록 테이블 모바일 카드형 전환 */
@media (max-width: 640px) {
    .board thead { display: none; }
    .board, .board tbody, .board tr, .board td { display: block; width: 100%; }
    .board tr {
        border: 1px solid var(--border);
        border-radius: 10px;
        margin-bottom: 0.8rem;
        overflow: hidden;
    }
    .board td {
        border: 0;
        border-bottom: 1px solid #f1f5f9;
        padding: 0.55rem 1rem;
        white-space: normal;
        word-break: break-word;
        display: flex;
        justify-content: space-between;
        align-items: baseline;
        gap: 1rem;
    }
    .board td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--muted);
        font-size: 0.8rem;
        flex-shrink: 0;
    }
    .board td:last-child { border-bottom: 0; }

    .board.detail-table tr { padding: 0.4rem 0; }
    .board.detail-table th, .board.detail-table td {
        display: block;
        width: 100%;
        border: 0;
    }
    .board.detail-table th {
        background: none;
        padding: 0.6rem 1rem 0.1rem;
        font-size: 0.8rem;
    }
    .board.detail-table td { padding: 0.1rem 1rem 0.6rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .auth-box { margin: 1.5rem auto; padding: 1.5rem; }
    .hero h2 { font-size: 1.7rem; }
    .post { padding: 1.25rem; }
}