/* ── Supabase 색상 체계 완전 모방 ── */
:root {
  /* Supabase 정확한 색상 */
  --sb-bg:       #1c1c1c;   /* 앱 최외곽 배경 */
  --sb-sidebar:  #1a1a1a;   /* 사이드바 배경 */
  --sb-panel:    #242424;   /* 패널 배경 */
  --sb-surface:  #2a2a2a;   /* 카드·테이블 */
  --sb-border:   #333333;   /* 테두리 */
  --sb-border2:  #3d3d3d;   /* 밝은 테두리 */

  /* 텍스트 */
  --sb-txt:      #ededed;
  --sb-txt2:     #a0a0a0;
  --sb-txt3:     #6b6b6b;

  /* 브랜드 */
  --sb-green:    #3ecf8e;   /* Supabase 메인 그린 */
  --sb-green-bg: rgba(62,207,142,.12);
  --sb-green-bd: rgba(62,207,142,.3);

  /* 상태 */
  --sb-blue:     #2196f3;
  --sb-blue-bg:  rgba(33,150,243,.12);
  --sb-red:      #f44336;
  --sb-red-bg:   rgba(244,67,54,.12);
  --sb-yellow:   #ff9800;
  --sb-yellow-bg:rgba(255,152,0,.12);
  --sb-purple:   #9c27b0;
  --sb-purple-bg:rgba(156,39,176,.12);

  /* 사이드바 */
  --sb-side-w:   56px;      /* 아이콘만 */
  --sb-side-exp: 220px;     /* 확장 시 */
  --sb-top:      48px;      /* 상단 바 */

  --font: -apple-system, 'Pretendard', 'Apple SD Gothic Neo', sans-serif;
  --r: 6px;
  --r2: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  font-size: 13px;
  color: var(--sb-txt);
  background: var(--sb-bg);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { font-family: var(--font); cursor: pointer; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity:0; transform:translateY(4px); } to { opacity:1; transform:none; } }
@keyframes slideIn { from { opacity:0; transform:translateX(-8px); } to { opacity:1; transform:none; } }

/* ══════════════════════════════════════
   상단 바 (Supabase 정확히 모방)
══════════════════════════════════════ */
.topbar {
  position: fixed; top:0; left:0; right:0; height: var(--sb-top);
  background: var(--sb-sidebar);
  border-bottom: 1px solid var(--sb-border);
  display: flex; align-items: center;
  padding: 0 16px 0 0;
  z-index: 300;
  gap: 0;
}
.topbar-logo {
  width: var(--sb-side-w);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.topbar-logo-mark {
  width: 28px; height: 28px;
  background: var(--sb-green);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 900; color: #fff;
  letter-spacing: -.5px;
}
.topbar-divider {
  width: 1px; height: 20px;
  background: var(--sb-border);
  margin: 0 12px;
}
.topbar-breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--sb-txt2);
}
.topbar-breadcrumb span { color: var(--sb-txt); font-weight: 600; }
.topbar-breadcrumb .sep { color: var(--sb-txt3); }
.topbar-right {
  margin-left: auto;
  display: flex; align-items: center; gap: 8px;
}
.tb-btn {
  padding: 5px 12px;
  border-radius: var(--r);
  font-size: 12px; font-weight: 600;
  border: 1px solid var(--sb-border2);
  background: var(--sb-surface);
  color: var(--sb-txt2);
  transition: all .15s;
}
.tb-btn:hover { color: var(--sb-txt); border-color: var(--sb-txt3); }
.tb-btn-green {
  background: var(--sb-green);
  color: #000; border-color: transparent;
  font-weight: 700;
}
.tb-btn-green:hover { background: #32b87a; }
.tb-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sb-green) 0%, #1a9e6a 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 800; color: #000;
}

/* ══════════════════════════════════════
   사이드바 (Supabase 호버 확장)
══════════════════════════════════════ */
.sidebar {
  position: fixed; top: var(--sb-top); left: 0; bottom: 0;
  width: var(--sb-side-w);
  background: var(--sb-sidebar);
  border-right: 1px solid var(--sb-border);
  z-index: 200;
  display: flex; flex-direction: column;
  overflow: hidden;
  transition: width .2s cubic-bezier(.4,0,.2,1);
}
.sidebar:hover { width: var(--sb-side-exp); }

.sidebar-section { padding: 8px 0; }
.sidebar-section + .sidebar-section {
  border-top: 1px solid var(--sb-border);
  margin-top: 4px;
}
.sidebar-section-label {
  padding: 6px 14px 4px;
  font-size: 10px; font-weight: 700;
  color: var(--sb-txt3);
  text-transform: uppercase; letter-spacing: .6px;
  white-space: nowrap; overflow: hidden;
  opacity: 0;
  transition: opacity .15s .05s;
}
.sidebar:hover .sidebar-section-label { opacity: 1; }

.sb-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 0 14px;
  height: 36px;
  cursor: pointer;
  border-radius: 0;
  color: var(--sb-txt2);
  transition: color .12s, background .12s;
  white-space: nowrap; overflow: hidden;
  position: relative;
}
.sb-nav-item:hover { background: rgba(255,255,255,.05); color: var(--sb-txt); }
.sb-nav-item.active {
  color: var(--sb-txt);
  background: rgba(62,207,142,.08);
}
.sb-nav-item.active::before {
  content: '';
  position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 2px; border-radius: 0 2px 2px 0;
  background: var(--sb-green);
}
.sb-nav-icon {
  width: 28px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.sb-nav-label {
  font-size: 13px; font-weight: 500;
  opacity: 0;
  transition: opacity .12s .05s;
}
.sidebar:hover .sb-nav-label { opacity: 1; }
.sb-nav-badge {
  margin-left: auto;
  background: var(--sb-green-bg);
  color: var(--sb-green);
  border: 1px solid var(--sb-green-bd);
  border-radius: 10px;
  padding: 1px 6px;
  font-size: 10px; font-weight: 700;
  opacity: 0;
  transition: opacity .12s .05s;
}
.sidebar:hover .sb-nav-badge { opacity: 1; }

/* ══════════════════════════════════════
   메인 콘텐츠 영역
══════════════════════════════════════ */
.main {
  margin-top: var(--sb-top);
  margin-left: var(--sb-side-w);
  height: calc(100vh - var(--sb-top));
  overflow-y: auto;
  background: var(--sb-bg);
  transition: margin-left .2s cubic-bezier(.4,0,.2,1);
}
.sidebar:hover ~ .main { margin-left: var(--sb-side-exp); }

.page { display: none; padding: 24px; animation: fadeIn .2s ease; }
.page.active { display: block; }

/* ── 페이지 헤더 ── */
.page-header {
  display: flex; align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px; gap: 16px;
}
.page-title { font-size: 20px; font-weight: 700; color: var(--sb-txt); margin-bottom: 4px; }
.page-sub { font-size: 13px; color: var(--sb-txt2); line-height: 1.5; }
.page-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ── 카드 그리드 ── */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ── 카드 (Supabase 스타일) ── */
.card {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  overflow: hidden;
  animation: fadeIn .25s ease;
}
.card-hd {
  padding: 16px 20px 0;
  display: flex; align-items: center; gap: 10px;
}
.card-title { font-size: 13px; font-weight: 600; color: var(--sb-txt); }
.card-sub { font-size: 12px; color: var(--sb-txt2); margin-top: 2px; }
.card-body { padding: 16px 20px; }
.card-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--sb-border);
  background: var(--sb-surface);
  font-size: 11px; color: var(--sb-txt3);
}

/* ── KPI 카드 ── */
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
.kpi {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  padding: 16px 18px;
}
.kpi-label { font-size: 11px; font-weight: 600; color: var(--sb-txt3); text-transform: uppercase; letter-spacing: .4px; margin-bottom: 6px; }
.kpi-value { font-size: 26px; font-weight: 800; color: var(--sb-txt); letter-spacing: -.5px; }
.kpi-unit { font-size: 12px; color: var(--sb-txt3); margin-top: 2px; }
.kpi-trend { font-size: 11px; margin-top: 4px; }
.kpi-trend.up { color: var(--sb-green); }
.kpi-trend.down { color: var(--sb-red); }
.kpi-trend.neu { color: var(--sb-txt3); }

/* ── 배지 ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 600;
  border: 1px solid;
}
.badge-green { background: var(--sb-green-bg); color: var(--sb-green); border-color: var(--sb-green-bd); }
.badge-blue  { background: var(--sb-blue-bg);  color: var(--sb-blue);  border-color: rgba(33,150,243,.3); }
.badge-red   { background: var(--sb-red-bg);   color: var(--sb-red);   border-color: rgba(244,67,54,.3); }
.badge-yellow{ background: var(--sb-yellow-bg);color: var(--sb-yellow);border-color: rgba(255,152,0,.3); }
.badge-purple{ background: var(--sb-purple-bg);color: var(--sb-purple);border-color: rgba(156,39,176,.3); }
.badge-gray  { background: rgba(255,255,255,.05); color: var(--sb-txt2); border-color: var(--sb-border2); }

/* ── 테이블 (Supabase Table Editor 모방) ── */
.sb-table-wrap {
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  overflow: hidden;
  background: var(--sb-panel);
}
.sb-table-toolbar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--sb-border);
  background: var(--sb-surface);
}
.sb-table-search {
  flex: 1; display: flex; align-items: center; gap: 8px;
  background: var(--sb-panel);
  border: 1px solid var(--sb-border2);
  border-radius: var(--r);
  padding: 5px 10px;
  font-size: 12px; color: var(--sb-txt2);
}
.sb-table {
  width: 100%; border-collapse: collapse;
  font-size: 12px;
}
.sb-table th {
  background: var(--sb-surface);
  padding: 8px 14px;
  text-align: left;
  font-size: 11px; font-weight: 600;
  color: var(--sb-txt3);
  border-bottom: 1px solid var(--sb-border);
  white-space: nowrap;
}
.sb-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--sb-border);
  color: var(--sb-txt);
  vertical-align: middle;
}
.sb-table tr:last-child td { border-bottom: none; }
.sb-table tr:hover td { background: rgba(255,255,255,.03); }
.sb-table .td-mono { font-family: monospace; font-size: 11px; color: var(--sb-txt2); }
.sb-table .td-null { color: var(--sb-txt3); font-style: italic; }

/* ── 진도 바 ── */
.progress-wrap { display: flex; flex-direction: column; gap: 10px; }
.progress-row { display: flex; align-items: center; gap: 10px; }
.progress-label { width: 110px; font-size: 12px; color: var(--sb-txt2); flex-shrink: 0; }
.progress-track { flex: 1; height: 6px; background: var(--sb-surface); border-radius: 3px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 3px; transition: width .8s ease; }
.progress-val { width: 40px; text-align: right; font-size: 12px; font-weight: 700; color: var(--sb-txt); flex-shrink: 0; }

/* ── 7단계 스텝 ── */
.steps { display: flex; flex-direction: column; gap: 0; }
.step {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--sb-border);
  cursor: pointer;
  transition: background .12s;
  border-radius: var(--r);
  padding-left: 8px; padding-right: 8px;
}
.step:last-child { border-bottom: none; }
.step:hover { background: rgba(255,255,255,.03); }
.step.active { background: var(--sb-green-bg); }
.step-num {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--sb-surface);
  border: 1px solid var(--sb-border2);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800; color: var(--sb-txt2);
  flex-shrink: 0; margin-top: 2px;
}
.step.active .step-num {
  background: var(--sb-green);
  color: #000; border-color: transparent;
}
.step.done .step-num {
  background: var(--sb-green-bg);
  color: var(--sb-green);
  border-color: var(--sb-green-bd);
}
.step-body { flex: 1; }
.step-title { font-size: 13px; font-weight: 600; color: var(--sb-txt); margin-bottom: 2px; }
.step-desc { font-size: 12px; color: var(--sb-txt2); line-height: 1.5; }
.step-meta { font-size: 11px; color: var(--sb-green); margin-top: 4px; font-weight: 600; }

/* ── 학제 타임라인 ── */
.timeline { display: flex; gap: 0; position: relative; }
.timeline::before {
  content: '';
  position: absolute; top: 20px; left: 0; right: 0; height: 2px;
  background: var(--sb-border);
}
.tl-item { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 8px; position: relative; }
.tl-dot {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--sb-surface);
  border: 2px solid var(--sb-border2);
  z-index: 1;
  transition: all .2s;
}
.tl-item.active .tl-dot { background: var(--sb-green); border-color: var(--sb-green); box-shadow: 0 0 0 4px var(--sb-green-bg); }
.tl-item.done .tl-dot { background: var(--sb-green-bg); border-color: var(--sb-green); }
.tl-label { font-size: 11px; font-weight: 700; color: var(--sb-txt2); text-align: center; }
.tl-item.active .tl-label { color: var(--sb-green); }
.tl-age { font-size: 10px; color: var(--sb-txt3); text-align: center; }

/* ── 섹션 헤더 ── */
.section-hd {
  font-size: 11px; font-weight: 700;
  color: var(--sb-txt3);
  text-transform: uppercase; letter-spacing: .5px;
  margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
.section-hd::after { content: ''; flex: 1; height: 1px; background: var(--sb-border); }

/* ── 입력 ── */
.sb-input {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border2);
  border-radius: var(--r);
  padding: 7px 11px;
  font-family: var(--font); font-size: 13px;
  color: var(--sb-txt);
  outline: none; width: 100%;
  transition: border-color .15s;
}
.sb-input:focus { border-color: var(--sb-green); }
.sb-input::placeholder { color: var(--sb-txt3); }

.sb-select {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border2);
  border-radius: var(--r);
  padding: 6px 10px;
  font-family: var(--font); font-size: 12px;
  color: var(--sb-txt2); outline: none;
  cursor: pointer;
}

/* ── 버튼 ── */
.btn {
  padding: 7px 14px; border-radius: var(--r);
  font-family: var(--font); font-size: 12px; font-weight: 600;
  border: 1px solid var(--sb-border2);
  background: var(--sb-surface); color: var(--sb-txt2);
  transition: all .12s; display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { color: var(--sb-txt); border-color: var(--sb-txt3); }
.btn-primary {
  background: var(--sb-green); color: #000;
  border-color: transparent; font-weight: 700;
}
.btn-primary:hover { background: #32b87a; }
.btn-danger { background: var(--sb-red-bg); color: var(--sb-red); border-color: rgba(244,67,54,.3); }

/* ── 학생 프로필 카드 ── */
.student-card {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  padding: 16px;
  display: flex; align-items: center; gap: 14px;
  transition: border-color .15s;
  cursor: pointer;
}
.student-card:hover { border-color: var(--sb-green); }
.student-avatar {
  width: 42px; height: 42px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; flex-shrink: 0;
}
.student-name { font-size: 14px; font-weight: 700; color: var(--sb-txt); }
.student-meta { font-size: 11px; color: var(--sb-txt2); margin-top: 2px; }
.student-level { margin-left: auto; text-align: right; }

/* ── AI 교수 패널 ── */
.prof-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.prof-card {
  background: var(--sb-surface);
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  padding: 14px 12px;
  text-align: center;
  transition: border-color .15s;
  cursor: pointer;
}
.prof-card:hover { border-color: var(--sb-green-bd); }
.prof-icon { font-size: 28px; margin-bottom: 8px; }
.prof-name { font-size: 11px; font-weight: 700; color: var(--sb-txt); margin-bottom: 2px; }
.prof-spec { font-size: 10px; color: var(--sb-txt3); }
.prof-status {
  margin-top: 8px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--sb-green);
  margin-left: auto; margin-right: auto;
}

/* ── SQL 에디터 스타일 (커리큘럼 뷰어) ── */
.code-panel {
  background: #0d0d0d;
  border: 1px solid var(--sb-border);
  border-radius: var(--r2);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 12px;
  line-height: 1.7;
  padding: 16px 18px;
  color: #c9d1d9;
  overflow-x: auto;
  white-space: pre;
}
.code-kw { color: #ff7b72; }  /* 키워드 */
.code-str { color: #a5d6ff; } /* 문자열 */
.code-num { color: #79c0ff; } /* 숫자 */
.code-cmt { color: #6b6b6b; } /* 주석 */
.code-fn  { color: #d2a8ff; } /* 함수 */

/* ── 탭 ── */
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--sb-border); margin-bottom: 20px; }
.tab {
  padding: 10px 16px;
  font-size: 13px; font-weight: 500; color: var(--sb-txt2);
  border-bottom: 2px solid transparent;
  cursor: pointer; transition: color .12s;
}
.tab:hover { color: var(--sb-txt); }
.tab.active { color: var(--sb-txt); border-bottom-color: var(--sb-green); font-weight: 600; }

/* ── 알림 ── */
.alert {
  padding: 12px 14px;
  border-radius: var(--r);
  border: 1px solid;
  font-size: 12px; line-height: 1.6;
  display: flex; align-items: flex-start; gap: 10px;
  margin-bottom: 14px;
}
.alert-green { background: var(--sb-green-bg); border-color: var(--sb-green-bd); color: var(--sb-green); }
.alert-blue  { background: var(--sb-blue-bg);  border-color: rgba(33,150,243,.3); color: var(--sb-blue); }
.alert-yellow{ background: var(--sb-yellow-bg);border-color: rgba(255,152,0,.3); color: var(--sb-yellow); }

/* ══════════════════════════════════════
   반응형 (태블릿 10인치 = 1024px 기준)
══════════════════════════════════════ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .prof-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .prof-grid { grid-template-columns: repeat(2, 1fr); }
  .page { padding: 16px; }
}

/* ── 로딩 스피너 ── */
.spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(62,207,142,.2);
  border-top-color: var(--sb-green);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

/* ── 빈 상태 ── */
.empty {
  text-align: center; padding: 48px 20px;
  color: var(--sb-txt3);
}
.empty-icon { font-size: 36px; margin-bottom: 10px; }
.empty-title { font-size: 14px; font-weight: 600; color: var(--sb-txt2); margin-bottom: 4px; }

/* ── 모달 ── */
.modal-bg {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.6); z-index: 9000;
  align-items: center; justify-content: center; padding: 24px;
}
.modal-bg.open { display: flex; }
.modal {
  background: var(--sb-panel);
  border: 1px solid var(--sb-border2);
  border-radius: var(--r2);
  width: min(560px, 100%);
  box-shadow: 0 24px 64px rgba(0,0,0,.5);
  animation: fadeIn .2s ease;
}
.modal-hd {
  padding: 18px 20px;
  border-bottom: 1px solid var(--sb-border);
  display: flex; align-items: center; gap: 10px;
}
.modal-title { font-size: 15px; font-weight: 700; color: var(--sb-txt); }
.modal-body { padding: 20px; }
.modal-ft {
  padding: 14px 20px;
  border-top: 1px solid var(--sb-border);
  display: flex; justify-content: flex-end; gap: 8px;
}

/* ── 인증 오버레이 ── */
#auth-loading {
  background: var(--sb-bg);
}