@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Noto+Sans+KR:wght@400;500;700&display=swap');

:root {
  --bg: #0a0e17;
  --surface: #111827;
  --surface2: #1a2236;
  --border: #1e3a5f;
  --accent: #00d4ff;
  --accent2: #ff6b35;
  --accent3: #39ff14;
  --text: #e2e8f0;
  --text-dim: #64748b;
  --danger: #ff4757;
  --warning: #ffa502;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Page Wrapper (fixes header/content width) ────────────── */
.page-wrap {
  max-width: 1400px; margin: 0 auto; position: relative;
}

/* ── Header ───────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,14,23,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.header-logo {
  font-family: 'Space Mono', monospace;
  font-size: 18px; color: var(--accent); letter-spacing: 2px;
}
.header-logo span { color: var(--accent2); }
.header-badge {
  font-family: 'Space Mono', monospace; font-size: 11px;
  background: rgba(0,212,255,0.1); border: 1px solid var(--accent);
  color: var(--accent); padding: 4px 12px; border-radius: 2px; letter-spacing: 1px;
}

/* ── Demo Banner ──────────────────────────────────────────── */
.demo-banner {
  padding: 8px 24px;
  display: flex; align-items: center; gap: 16px;
  font-family: 'Space Mono', monospace; font-size: 12px;
}

/* ── Step 0 Bar ───────────────────────────────────────────── */
.step0-bar {
  display: flex; align-items: center; gap: 16px;
  padding: 10px 24px;
  background: rgba(167,139,250,0.06);
  border-bottom: 1px solid rgba(167,139,250,0.15);
}
.step0-label {
  font-family: 'Space Mono', monospace;
  font-size: 10px; font-weight: 700; letter-spacing: .1em;
  color: var(--accent4, #a78bfa);
  background: rgba(167,139,250,0.12);
  border: 1px solid rgba(167,139,250,0.3);
  padding: 3px 8px; border-radius: 3px; white-space: nowrap; flex-shrink: 0;
}
.step0-flow { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.step0-item {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 6px;
  border: 1px solid rgba(167,139,250,0.2);
  background: rgba(167,139,250,0.07);
  text-decoration: none; transition: all .2s;
  color: var(--text);
}
.step0-item:hover {
  background: rgba(167,139,250,0.15);
  border-color: rgba(167,139,250,0.4);
}
.step0-item-icon { font-size: 14px; }
.step0-item-body { display: flex; flex-direction: column; gap: 1px; }
.step0-item-name { font-size: 12px; font-weight: 600; color: var(--text); }
.step0-item-sub  { font-size: 10px; color: var(--text-dim); }
.step0-arrow {
  font-size: 14px; color: rgba(167,139,250,0.5);
  flex-shrink: 0;
}
.step0-desc {
  font-size: 11px; color: var(--text-dim); margin-left: auto;
  display: flex; align-items: center; gap: 6px;
}

/* ── Tab Bar ──────────────────────────────────────────────── */
.tab-bar {
  display: flex; gap: 4px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface); position: sticky; top: 57px; z-index: 90;
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 16px; font-size: 13px; font-family: 'Space Mono', monospace;
  cursor: pointer; border: none; background: transparent;
  color: var(--text-dim); border-bottom: 2px solid transparent;
  white-space: nowrap; transition: all 0.2s; letter-spacing: 0.5px;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Main Content ─────────────────────────────────────────── */
.main-pad { padding: 24px 24px 80px; position: relative; z-index: 1; max-width: 1400px; margin: 0 auto; }

/* ── Card ─────────────────────────────────────────────────── */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 4px; padding: 20px; margin-bottom: 16px;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.card-title {
  font-family: 'Space Mono', monospace; font-size: 12px;
  color: var(--accent); text-transform: uppercase; letter-spacing: 1.5px;
}

/* ── Form Controls ────────────────────────────────────────── */
.input-field {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  color: var(--text); padding: 9px 12px; font-size: 13px;
  border-radius: 3px; outline: none; font-family: inherit;
}
.input-field:focus { border-color: var(--accent); }
.input-label {
  display: block; font-size: 12px; color: var(--text-dim);
  margin-bottom: 6px; letter-spacing: 0.5px;
}
.form-group { margin-bottom: 12px; }

/* ── Two Column Grid ──────────────────────────────────────── */
.two-col-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  padding: 10px 24px; font-size: 13px; font-weight: 600;
  font-family: 'Space Mono', monospace; letter-spacing: 1px;
  cursor: pointer; border: none; border-radius: 3px; transition: all 0.2s;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: #00b8d9; }
.btn-outline { background: transparent; border: 1px solid var(--accent); color: var(--accent); }
.btn-outline:hover { background: rgba(0,212,255,0.1); }
.btn-outline-green { background: transparent; border: 1px solid var(--accent3); color: var(--accent3); }
.btn-outline-red { background: transparent; border: 1px solid var(--danger); color: var(--danger); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.action-btns { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

/* ── Terminal / Log ───────────────────────────────────────── */
.terminal {
  background: #05080f; border: 1px solid var(--border);
  border-radius: 3px; padding: 14px;
  font-family: 'Space Mono', monospace; font-size: 11px;
  height: 200px; overflow-y: auto; margin-top: 12px;
  color: var(--accent3); line-height: 1.8;
}
.terminal .t-dim { color: var(--text-dim); }
.terminal .t-info { color: var(--accent); }
.terminal .t-warn { color: var(--warning); }
.terminal .t-err { color: var(--danger); }

/* ── Progress Bar ─────────────────────────────────────────── */
.progress-wrap { height: 3px; background: var(--border); border-radius: 2px; margin-top: 10px; }
.progress-bar { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.3s; }

/* ── Stat Box ─────────────────────────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat-box { background: var(--bg); border: 1px solid var(--border); border-radius: 3px; padding: 12px; text-align: center; }
.stat-value { font-family: 'Space Mono', monospace; font-size: 20px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 11px; color: var(--text-dim); margin-top: 4px; }

/* ── Data Table ───────────────────────────────────────────── */
.table-wrap { overflow-x: auto; max-height: 300px; overflow-y: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.data-table th { background: var(--surface2); color: var(--accent); padding: 8px 12px; text-align: left; font-family: 'Space Mono', monospace; font-size: 11px; white-space: nowrap; border-bottom: 1px solid var(--border); position: sticky; top: 0; }
.data-table td { padding: 6px 12px; border-bottom: 1px solid rgba(30,58,95,0.5); color: var(--text-dim); white-space: nowrap; }
.data-table tr:hover td { background: rgba(0,212,255,0.03); color: var(--text); }

/* ── Section Info ─────────────────────────────────────────── */
.section-info {
  font-size: 12px; color: var(--text-dim); margin-bottom: 16px; line-height: 1.7;
  padding: 10px 14px; background: rgba(0,212,255,0.04);
  border-left: 2px solid var(--accent); border-radius: 0 3px 3px 0;
}
.section-info-green {
  font-size: 12px; color: var(--text-dim); margin-bottom: 16px; line-height: 1.7;
  padding: 8px 12px; background: rgba(57,255,20,0.04);
  border-left: 2px solid var(--accent3); border-radius: 0 3px 3px 0;
}

/* ── Toggle Switch ────────────────────────────────────────── */
.toggle-wrap { position: relative; width: 36px; height: 20px; flex-shrink: 0; cursor: pointer; display: inline-block; }
.toggle-track {
  position: absolute; inset: 0; border-radius: 20px; transition: 0.2s;
}
.toggle-thumb {
  position: absolute; width: 14px; height: 14px; top: 3px;
  border-radius: 50%; transition: 0.2s;
}

/* ── Anomaly Row ──────────────────────────────────────────── */
.anomaly-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; background: var(--bg);
  border: 1px solid var(--border); border-radius: 3px; margin-bottom: 8px; font-size: 12px;
}

/* ── Difficulty Selector ──────────────────────────────────── */
.difficulty-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.diff-btn {
  padding: 10px 8px; border: 1px solid var(--border); border-radius: 3px;
  background: var(--bg); cursor: pointer; text-align: center; transition: all 0.2s;
}
.diff-btn:hover { border-color: var(--text-dim); }
.diff-btn.active { background: rgba(0,212,255,0.06); }
.diff-name { font-family: 'Space Mono', monospace; font-size: 12px; font-weight: 700; }
.diff-acc { font-size: 10px; margin-top: 2px; opacity: 0.8; }
.diff-desc { font-size: 10px; color: var(--text-dim); margin-top: 4px; line-height: 1.4; }

/* ── Format Selector ──────────────────────────────────────── */
.format-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.fmt-btn {
  padding: 7px 20px; font-family: 'Space Mono', monospace; font-size: 12px;
  border-radius: 3px; cursor: pointer; transition: all 0.2s;
  border: 1px solid var(--border); background: var(--bg); color: var(--text-dim);
}
.fmt-btn.active { background: rgba(0,212,255,0.1); border-color: var(--accent); color: var(--accent); }

/* ── Checkbox Pill ────────────────────────────────────────── */
.col-pill {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: 3px; cursor: pointer; font-size: 12px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  user-select: none; transition: all 0.2s;
}
.col-pill.selected { background: rgba(0,212,255,0.06); border-color: var(--accent); color: var(--accent); }
.col-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; }

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 1000;
  background: rgba(0,0,0,0.7); align-items: center; justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal-box {
  background: var(--surface); border: 1px solid var(--border); border-radius: 6px;
  padding: 32px; width: 380px; max-width: 92vw;
}
.modal-title {
  font-family: 'Space Mono', monospace; font-size: 14px; color: var(--accent);
  margin-bottom: 20px; letter-spacing: 1px;
}

/* ── Schema Table ─────────────────────────────────────────── */
.schema-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.schema-table th { background: var(--surface2); color: var(--accent); padding: 8px 12px; text-align: left; font-family: 'Space Mono', monospace; font-size: 11px; }
.schema-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.schema-table .col-name { font-family: 'Space Mono', monospace; color: var(--accent3); }
.schema-table .col-type { color: var(--warning); font-size: 11px; }

/* ── Stream ───────────────────────────────────────────────── */
.stream-log {
  background: #05080f; border: 1px solid var(--border); border-radius: 3px; padding: 14px;
  font-family: 'Space Mono', monospace; font-size: 11px; height: 300px; overflow-y: auto;
  color: var(--accent3); line-height: 1.8;
}
.pulse { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.pulse.on { background: var(--accent3); box-shadow: 0 0 10px var(--accent3); }
.pulse.off { background: var(--text-dim); }

/* ── Inline Row Layout ────────────────────────────────────── */
.inline-row { display: flex; gap: 8px; align-items: center; }

/* ── Mobile Tab Select ────────────────────────────────────── */
.tab-select-mobile {
  display: none;
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border: none;
  border-bottom: 2px solid var(--accent);
  padding: 13px 16px 13px 20px;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  outline: none;
  position: sticky;
  top: 57px;
  z-index: 90;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2300d4ff' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 640px) {
  .site-header { padding: 10px 16px; }
  .header-badge { display: none; }
  .demo-banner { flex-direction: column; align-items: flex-start; gap: 8px; padding: 10px 16px; }
  .step0-bar { padding: 10px 16px; gap: 10px; }
  .step0-desc { display: none; }
  .main-pad { padding: 16px 12px 60px; }
  .tab-bar { display: none; }
  .tab-select-mobile { display: block; }
  .two-col-grid { grid-template-columns: 1fr; }
  .action-btns { flex-direction: column; }
  .action-btns > button { width: 100%; text-align: center; }
  .anomaly-row { flex-wrap: wrap; row-gap: 8px; }
  .difficulty-grid { grid-template-columns: repeat(2, 1fr); }
  .modal-box { width: 92vw; padding: 24px 20px; }
}