/* =========================================================================
 * Vertica SQL Lab — 스타일
 * 스카이블루 계열 + 밝은 배경, IDE형 3분할 레이아웃
 * ========================================================================= */
:root {
  --sky-50:  #f0f9ff;
  --sky-100: #e0f2fe;
  --sky-200: #bae6fd;
  --sky-300: #7dd3fc;
  --sky-400: #38bdf8;
  --sky-500: #0ea5e9;
  --sky-600: #0284c7;
  --sky-700: #0369a1;
  --sky-900: #0c4a6e;

  --bg:      #f4f8fc;
  --card:    #ffffff;
  --line:    #e2e8f0;
  --line-2:  #cbd5e1;
  --ink:     #0f172a;
  --ink-2:   #334155;
  --muted:   #64748b;
  --muted-2: #94a3b8;

  --ok:      #16a34a;
  --ok-bg:   #f0fdf4;
  --bad:     #dc2626;
  --bad-bg:  #fef2f2;
  --warn:    #d97706;
  --warn-bg: #fffbeb;

  --radius:  12px;
  --radius-s: 8px;
  --shadow:  0 1px 2px rgba(15, 23, 42, .04), 0 4px 16px rgba(15, 23, 42, .06);
  --shadow-s: 0 1px 2px rgba(15, 23, 42, .06);
  --mono: 'D2Coding', 'Consolas', 'Menlo', 'Monaco', 'Courier New', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Malgun Gothic', '맑은 고딕',
          'Apple SD Gothic Neo', 'Noto Sans KR', 'Segoe UI', sans-serif;

  --header-h: 56px;
  --side-w: 264px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}
a { color: var(--sky-700); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; line-height: 1.35; }
p { margin: 0 0 10px; }
code { font-family: var(--mono); }

/* ---------------- 헤더 ---------------- */
.app-header {
  position: sticky; top: 0; z-index: 40;
  height: var(--header-h);
  display: flex; align-items: center; gap: 14px;
  padding: 0 16px;
  background: linear-gradient(90deg, var(--sky-700), var(--sky-500));
  color: #fff;
  box-shadow: 0 2px 10px rgba(2, 132, 199, .25);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 15.5px; letter-spacing: -.2px; }
.brand .logo {
  width: 26px; height: 26px; border-radius: 7px;
  background: rgba(255, 255, 255, .2);
  display: grid; place-items: center; font-size: 14px;
}
.brand small { font-weight: 500; opacity: .8; font-size: 11.5px; margin-left: 2px; }
.top-nav { display: flex; gap: 2px; margin-left: 6px; }
.top-nav a {
  color: rgba(255, 255, 255, .85); padding: 6px 11px; border-radius: 8px;
  font-size: 13px; font-weight: 600; text-decoration: none;
}
.top-nav a:hover { background: rgba(255, 255, 255, .14); color: #fff; text-decoration: none; }
.top-nav a.on { background: rgba(255, 255, 255, .22); color: #fff; }
.header-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.db-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11.5px; font-weight: 600;
  background: rgba(255, 255, 255, .16); padding: 5px 10px; border-radius: 999px;
}
.db-dot { width: 7px; height: 7px; border-radius: 50%; background: #fbbf24; }
.db-badge.ready .db-dot { background: #4ade80; }
.db-badge.err .db-dot { background: #f87171; }
.score-chip {
  font-size: 12px; font-weight: 700; background: #fff; color: var(--sky-700);
  padding: 5px 11px; border-radius: 999px;
}
.menu-btn {
  display: none; background: rgba(255, 255, 255, .16); border: 0; color: #fff;
  width: 34px; height: 32px; border-radius: 8px; font-size: 16px; cursor: pointer;
}

/* ---------------- 레이아웃 ---------------- */
.layout { display: flex; align-items: flex-start; }
.sidebar {
  width: var(--side-w); flex: 0 0 var(--side-w);
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--card);
  border-right: 1px solid var(--line);
  padding: 14px 10px 40px;
}
.main { flex: 1; min-width: 0; padding: 18px 20px 60px; }
.sb-title {
  font-size: 11px; font-weight: 700; color: var(--muted-2);
  letter-spacing: .06em; text-transform: uppercase; padding: 4px 8px 8px;
}
.sb-level { margin-bottom: 4px; }
.sb-level-head {
  display: flex; align-items: center; gap: 8px; width: 100%;
  padding: 8px 9px; border: 0; background: transparent; cursor: pointer;
  border-radius: var(--radius-s); font-family: inherit; font-size: 13px;
  font-weight: 700; color: var(--ink-2); text-align: left;
}
.sb-level-head:hover { background: var(--sky-50); }
.sb-level.open .sb-level-head { background: var(--sky-50); color: var(--sky-700); }
.sb-lv-no {
  flex: 0 0 auto; width: 20px; height: 20px; border-radius: 6px;
  background: var(--sky-100); color: var(--sky-700);
  font-size: 11px; display: grid; place-items: center; font-weight: 800;
}
.sb-level.done .sb-lv-no { background: var(--ok); color: #fff; }
.sb-prog { margin-left: auto; font-size: 10.5px; color: var(--muted-2); font-weight: 600; }
.sb-items { display: none; padding: 2px 0 8px 8px; }
.sb-level.open .sb-items { display: block; }
.sb-items a {
  display: flex; align-items: center; gap: 7px;
  padding: 5px 9px; border-radius: 7px; font-size: 12.5px;
  color: var(--ink-2); text-decoration: none;
}
.sb-items a:hover { background: var(--sky-50); text-decoration: none; }
.sb-items a.on { background: var(--sky-100); color: var(--sky-700); font-weight: 700; }
.sb-items a .ic { flex: 0 0 14px; font-size: 11px; color: var(--muted-2); }
.sb-items a.solved .ic { color: var(--ok); }
.sb-items a.lesson .ic { color: var(--sky-400); }

/* ---------------- 카드 · 공통 ---------------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-s);
  padding: 16px 18px; margin-bottom: 14px;
}
.card-h { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.card-h h2 { font-size: 15px; }
.card-h .sub { font-size: 12px; color: var(--muted); font-weight: 500; }
.page-h { margin-bottom: 16px; }
.page-h h1 { font-size: 21px; letter-spacing: -.3px; }
.page-h .lead { color: var(--muted); margin-top: 5px; font-size: 13.5px; }
.muted { color: var(--muted); }
.tiny { font-size: 12px; }
.right { margin-left: auto; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 14px; border-radius: var(--radius-s);
  border: 1px solid var(--line-2); background: #fff; color: var(--ink-2);
  font-family: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  transition: background .12s, border-color .12s, transform .06s, box-shadow .12s;
  text-decoration: none;
}
.btn:hover { background: var(--sky-50); border-color: var(--sky-300); color: var(--sky-700); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-primary {
  background: var(--sky-600); border-color: var(--sky-600); color: #fff;
  box-shadow: 0 1px 3px rgba(2, 132, 199, .35);
}
.btn-primary:hover { background: var(--sky-700); border-color: var(--sky-700); color: #fff; }
.btn-ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn-ok:hover { background: #15803d; border-color: #15803d; color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 11px; font-weight: 700; background: var(--sky-100); color: var(--sky-700);
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }
.badge.gray { background: #f1f5f9; color: var(--muted); }

.progress { height: 7px; background: var(--sky-100); border-radius: 999px; overflow: hidden; }
.progress > i { display: block; height: 100%; background: linear-gradient(90deg, var(--sky-400), var(--sky-600)); border-radius: 999px; transition: width .35s; }

/* ---------------- 대시보드 ---------------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; box-shadow: var(--shadow-s);
}
.stat .k { font-size: 11.5px; color: var(--muted); font-weight: 600; }
.stat .v { font-size: 24px; font-weight: 800; color: var(--sky-700); letter-spacing: -.5px; margin-top: 3px; }
.stat .v small { font-size: 13px; color: var(--muted-2); font-weight: 600; }

.lv-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.lv-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 15px 16px; box-shadow: var(--shadow-s); display: block; color: inherit;
  transition: border-color .12s, box-shadow .12s, transform .08s;
}
.lv-card:hover { border-color: var(--sky-300); box-shadow: var(--shadow); text-decoration: none; transform: translateY(-1px); }
.lv-card .lv-top { display: flex; align-items: center; gap: 9px; margin-bottom: 7px; }
.lv-card .lv-no {
  width: 26px; height: 26px; border-radius: 8px; background: var(--sky-100); color: var(--sky-700);
  display: grid; place-items: center; font-weight: 800; font-size: 12px; flex: 0 0 auto;
}
.lv-card.done .lv-no { background: var(--ok); color: #fff; }
.lv-card h3 { font-size: 14.5px; }
.lv-card .lv-sum { color: var(--muted); font-size: 12.5px; min-height: 38px; }
.kw { display: flex; flex-wrap: wrap; gap: 5px; margin: 9px 0 11px; }
.kw span { font-family: var(--mono); font-size: 10.5px; background: var(--sky-50); color: var(--sky-700); border: 1px solid var(--sky-100); padding: 1px 6px; border-radius: 5px; }

/* ---------------- 학습(강의) ---------------- */
.lesson { margin-bottom: 8px; }
.lesson h3 { font-size: 15px; color: var(--sky-800, #075985); margin-bottom: 10px; padding-bottom: 8px; border-bottom: 2px solid var(--sky-100); }
.blk-note { border-left: 3px solid var(--sky-400); background: var(--sky-50); padding: 10px 13px; border-radius: 0 var(--radius-s) var(--radius-s) 0; margin: 10px 0; font-size: 13px; }
.blk-warn { border-left: 3px solid var(--warn); background: var(--warn-bg); padding: 10px 13px; border-radius: 0 var(--radius-s) var(--radius-s) 0; margin: 10px 0; font-size: 13px; }
.blk-note b, .blk-warn b { display: block; font-size: 11px; letter-spacing: .04em; margin-bottom: 3px; }
.blk-note b { color: var(--sky-700); }
.blk-warn b { color: var(--warn); }
.blk-list { margin: 8px 0 12px; padding-left: 18px; }
.blk-list li { margin-bottom: 4px; font-size: 13px; }
.snippet { margin: 10px 0 14px; border: 1px solid var(--line); border-radius: var(--radius-s); overflow: hidden; }
.snippet-h {
  display: flex; align-items: center; gap: 8px; padding: 6px 10px;
  background: #f8fafc; border-bottom: 1px solid var(--line); font-size: 12px; color: var(--muted); font-weight: 600;
}
.snippet pre { margin: 0; padding: 11px 13px; background: #fbfdff; overflow-x: auto; }
.snippet pre code { font-size: 12.5px; line-height: 1.65; white-space: pre; }

/* ---------------- 실습 화면 ---------------- */
.practice { display: grid; grid-template-columns: minmax(300px, 380px) 1fr; gap: 14px; align-items: start; }
.pr-left { position: sticky; top: calc(var(--header-h) + 18px); max-height: calc(100vh - var(--header-h) - 40px); overflow-y: auto; }
.pr-desc { white-space: pre-wrap; font-size: 13.5px; color: var(--ink-2); }
.pr-meta { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; margin-bottom: 10px; }
.pid { font-family: var(--mono); font-size: 11.5px; color: var(--muted); }

.schema-box { margin-top: 12px; }
.schema-tb { border: 1px solid var(--line); border-radius: var(--radius-s); margin-bottom: 8px; overflow: hidden; }
.schema-tb > summary {
  cursor: pointer; padding: 7px 11px; background: #f8fafc; font-size: 12.5px;
  font-weight: 700; font-family: var(--mono); color: var(--sky-700);
  display: flex; align-items: center; gap: 8px;
}
.schema-tb > summary::-webkit-details-marker { display: none; }
.schema-tb > summary .lb { font-family: var(--sans); font-weight: 500; color: var(--muted); font-size: 11.5px; }
.schema-tb > summary .rc { margin-left: auto; font-family: var(--sans); font-size: 10.5px; color: var(--muted-2); }
.col-tb { width: 100%; border-collapse: collapse; font-size: 11.5px; }
.col-tb td { padding: 4px 10px; border-top: 1px solid var(--line); vertical-align: top; }
.col-tb td:first-child { font-family: var(--mono); font-weight: 600; color: var(--ink-2); white-space: nowrap; }
.col-tb td:nth-child(2) { font-family: var(--mono); color: var(--sky-600); white-space: nowrap; }
.col-tb td:last-child { color: var(--muted); word-break: break-word; }

/* 에디터 */
.editor-wrap {
  position: relative; border: 1px solid var(--line-2); border-radius: var(--radius-s);
  background: #fbfdff; overflow: hidden; transition: border-color .12s, box-shadow .12s;
}
.editor-wrap:focus-within { border-color: var(--sky-400); box-shadow: 0 0 0 3px rgba(56, 189, 248, .18); }
.editor-hl, .editor-ta {
  margin: 0; padding: 12px 14px;
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word; overflow-wrap: break-word;
  border: 0; tab-size: 2;
}
.editor-hl { position: absolute; inset: 0; pointer-events: none; overflow: hidden; color: var(--ink); }
.editor-ta {
  position: relative; display: block; width: 100%; min-height: 210px;
  background: transparent; color: transparent; caret-color: var(--sky-700);
  /* 세로 스크롤바가 생기면 하이라이트 레이어와 줄바꿈 위치가 어긋나므로
     스크롤 대신 높이를 늘린다 (editor.js 의 autosize) */
  resize: none; overflow: hidden; outline: none;
}
.editor-ta::selection { background: rgba(56, 189, 248, .3); }
.tok-kw   { color: #0369a1; font-weight: 700; }
.tok-fn   { color: #7c3aed; }
.tok-str  { color: #b45309; }
.tok-num  { color: #be185d; }
.tok-cmt  { color: #94a3b8; font-style: italic; }
.tok-op   { color: #64748b; }
.editor-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.editor-bar .hintkey { font-size: 11.5px; color: var(--muted-2); }
kbd {
  font-family: var(--mono); font-size: 10.5px; background: #f1f5f9; border: 1px solid var(--line-2);
  border-bottom-width: 2px; border-radius: 4px; padding: 1px 5px; color: var(--ink-2);
}

/* 결과 */
.result-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 9px; }
.result-stat { font-size: 12px; color: var(--muted); font-family: var(--mono); }
.tbl-scroll { overflow: auto; max-height: 380px; border: 1px solid var(--line); border-radius: var(--radius-s); }
table.rs { border-collapse: collapse; width: 100%; font-size: 12.5px; font-family: var(--mono); }
table.rs th {
  position: sticky; top: 0; z-index: 1;
  background: var(--sky-50); color: var(--sky-700); font-weight: 700;
  text-align: left; padding: 7px 11px; border-bottom: 2px solid var(--sky-200); white-space: nowrap;
}
table.rs td { padding: 5px 11px; border-bottom: 1px solid #f1f5f9; white-space: nowrap; }
table.rs tbody tr:nth-child(even) { background: #fcfdfe; }
table.rs tbody tr:hover { background: var(--sky-50); }
table.rs td.num { text-align: right; }
table.rs td.nul { color: var(--muted-2); font-style: italic; }
.sql-error {
  background: var(--bad-bg); border: 1px solid #fecaca; border-left: 3px solid var(--bad);
  color: #991b1b; padding: 11px 13px; border-radius: var(--radius-s); font-size: 13px;
}
.sql-error .msg { font-family: var(--mono); font-size: 12px; margin-top: 5px; color: #7f1d1d; word-break: break-all; }
.empty-note { padding: 22px; text-align: center; color: var(--muted-2); font-size: 13px; }

/* 채점 */
.verdict { border-radius: var(--radius-s); padding: 13px 15px; margin-bottom: 12px; border: 1px solid; }
.verdict.pass { background: var(--ok-bg); border-color: #bbf7d0; }
.verdict.fail { background: var(--bad-bg); border-color: #fecaca; }
.verdict h4 { font-size: 14.5px; display: flex; align-items: center; gap: 7px; }
.verdict.pass h4 { color: var(--ok); }
.verdict.fail h4 { color: var(--bad); }
.verdict .reason { margin-top: 5px; font-size: 13px; color: var(--ink-2); }
.verdict .detail { margin-top: 7px; font-family: var(--mono); font-size: 11.5px; color: var(--muted); white-space: pre-wrap; background: rgba(255,255,255,.6); padding: 8px 10px; border-radius: 6px; }
.hint-box { border: 1px solid var(--sky-200); background: var(--sky-50); border-radius: var(--radius-s); padding: 10px 13px; margin-bottom: 8px; font-size: 13px; }
.hint-box b { color: var(--sky-700); font-size: 11.5px; display: block; margin-bottom: 2px; }
.answer-box { border: 1px solid var(--line); border-radius: var(--radius-s); overflow: hidden; margin-top: 10px; }
.answer-box .ab-h { padding: 7px 11px; background: #f8fafc; border-bottom: 1px solid var(--line); font-size: 12px; font-weight: 700; color: var(--ink-2); }
.answer-box pre { margin: 0; padding: 11px 13px; overflow-x: auto; background: #fbfdff; }
.answer-box pre code { font-size: 12.5px; line-height: 1.6; }
.answer-box .expl { padding: 11px 13px; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink-2); background: #fff; }

.nav-foot { display: flex; gap: 8px; align-items: center; margin-top: 14px; flex-wrap: wrap; }

/* 스키마 페이지 */
.tb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }

/* 토스트 */
.toast-wrap { position: fixed; right: 16px; bottom: 16px; z-index: 90; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: var(--ink); color: #fff; padding: 9px 15px; border-radius: 999px;
  font-size: 12.5px; box-shadow: var(--shadow); animation: pop .2s ease-out;
}
.toast.ok { background: var(--ok); }
.toast.bad { background: var(--bad); }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.loading-veil {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: rgba(244, 248, 252, .92); text-align: center;
}
.loading-veil .sp {
  width: 34px; height: 34px; border-radius: 50%; margin: 0 auto 12px;
  border: 3px solid var(--sky-200); border-top-color: var(--sky-600);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- 반응형 ---------------- */
@media (max-width: 1080px) {
  .practice { grid-template-columns: 1fr; }
  .pr-left { position: static; max-height: none; }
}
@media (max-width: 860px) {
  .menu-btn { display: block; }
  .top-nav { display: none; }
  .sidebar {
    position: fixed; left: 0; top: var(--header-h); z-index: 35;
    height: calc(100vh - var(--header-h)); width: 82vw; max-width: 300px;
    transform: translateX(-102%); transition: transform .22s ease;
    box-shadow: 6px 0 24px rgba(15, 23, 42, .12);
  }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { position: fixed; inset: var(--header-h) 0 0; background: rgba(15,23,42,.35); z-index: 34; }
  .main { padding: 14px 13px 60px; }
  .brand small { display: none; }
  .page-h h1 { font-size: 18px; }
  .editor-ta { min-height: 170px; }
  .tbl-scroll { max-height: 300px; }
  .brand { white-space: nowrap; font-size: 14px; }
  .db-badge { font-size: 10.5px; padding: 4px 8px; }
  .score-chip { font-size: 11px; padding: 4px 8px; white-space: nowrap; }
  .header-right { gap: 6px; }
  /* 좁은 화면에서는 컬럼 설명이 잘리지 않도록 줄바꿈 허용 */
  .col-tb td:first-child, .col-tb td:nth-child(2) { white-space: normal; }
  .col-tb td { padding: 4px 8px; }
}