@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&family=DM+Mono:wght@400;500&display=swap');

:root {
  --bg: #0f0f0f;
  --bg2: #161616;
  --bg3: #1e1e1e;
  --bg4: #252525;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(255,255,255,0.14);
  --text: #f0ede8;
  --text2: #a09d98;
  --text3: #6b6866;
  --accent: #d4a853;
  --accent2: #e8c27a;
  --green: #5cb87a;
  --red: #e06c6c;
  --blue: #6b9fd4;
  --purple: #9b7fd4;
  --teal: #5bbfb5;
}

* { 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;
  font-size: 14px;
  line-height: 1.6;
}

/* ── Layout ── */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  min-height: 100vh;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 24px 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 100;
}

.main {
  margin-left: 220px;
  flex: 1;
  padding: 32px;
  max-width: 860px;
}

/* ── Sidebar ── */
.logo {
  padding: 0 20px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.logo-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.logo-sub {
  font-size: 11px;
  color: var(--text3);
  margin-top: 2px;
}

.nav-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0 20px;
  margin: 12px 0 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  cursor: pointer;
  color: var(--text2);
  font-size: 13px;
  transition: all .15s;
  border-left: 2px solid transparent;
}
.nav-item:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.nav-item.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(212,168,83,0.06);
}
.nav-icon { font-size: 14px; width: 18px; text-align: center; }

/* ── Pages ── */
.page { display: none; }
.page.active { display: block; }

/* ── Page Header ── */
.page-header { margin-bottom: 28px; }
.page-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.page-sub {
  font-size: 13px;
  color: var(--text3);
}

/* ── Cards ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 14px;
}
.card-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

/* ── Progress Overview ── */
.progress-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}
.stat-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}
.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  font-family: 'DM Mono', monospace;
  line-height: 1;
}
.stat-label { font-size: 11px; color: var(--text3); margin-top: 4px; }

/* ── Day Grid ── */
.day-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-bottom: 6px;
}
.day-dot {
  aspect-ratio: 1;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text3);
}
.day-dot.completed { background: rgba(92,184,122,0.15); border-color: var(--green); color: var(--green); }
.day-dot.current { background: rgba(212,168,83,0.2); border-color: var(--accent); color: var(--accent); }
.day-dot:hover { border-color: var(--border2); color: var(--text2); }

/* ── Curriculum ── */
.week-section { margin-bottom: 28px; }
.week-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.week-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1px solid;
}
.w1 { color: var(--teal); border-color: var(--teal); background: rgba(91,191,181,0.08); }
.w2 { color: var(--blue); border-color: var(--blue); background: rgba(107,159,212,0.08); }
.w3 { color: var(--purple); border-color: var(--purple); background: rgba(155,127,212,0.08); }

.week-title-text { font-size: 15px; font-weight: 700; color: var(--text); }
.week-sub-text { font-size: 12px; color: var(--text3); }

.day-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all .15s;
}
.day-row:hover { border-color: var(--border2); background: var(--bg4); }
.day-row.completed { border-color: rgba(92,184,122,0.25); }
.day-row.current { border-color: rgba(212,168,83,0.4); background: rgba(212,168,83,0.04); }

.day-num-badge {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-family: 'DM Mono', monospace;
  font-weight: 500;
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--bg2);
  color: var(--text3);
}
.day-row.completed .day-num-badge { background: rgba(92,184,122,0.15); border-color: var(--green); color: var(--green); }
.day-row.current .day-num-badge { background: rgba(212,168,83,0.2); border-color: var(--accent); color: var(--accent); }

.day-info { flex: 1; }
.day-title-text { font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 3px; }
.day-desc { font-size: 12px; color: var(--text3); line-height: 1.5; }

.day-status {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 99px;
  white-space: nowrap;
  align-self: flex-start;
}
.status-done { background: rgba(92,184,122,0.12); color: var(--green); border: 1px solid rgba(92,184,122,0.3); }
.status-current { background: rgba(212,168,83,0.12); color: var(--accent); border: 1px solid rgba(212,168,83,0.3); }
.status-locked { background: var(--bg2); color: var(--text3); border: 1px solid var(--border); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  font-family: 'Noto Sans KR', sans-serif;
  transition: all .15s;
}
.btn-primary { background: var(--accent); color: #0f0f0f; }
.btn-primary:hover { background: var(--accent2); }
.btn-secondary { background: var(--bg3); color: var(--text); border: 1px solid var(--border2); }
.btn-secondary:hover { background: var(--bg4); }
.btn-sm { padding: 6px 14px; font-size: 12px; }
.btn-danger { background: rgba(224,108,108,0.15); color: var(--red); border: 1px solid rgba(224,108,108,0.3); }

/* ── Quiz ── */
.quiz-progress-bar {
  height: 3px;
  background: var(--bg3);
  border-radius: 99px;
  margin-bottom: 24px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width .3s ease;
}
.quiz-question-num {
  font-size: 11px;
  color: var(--text3);
  font-family: 'DM Mono', monospace;
  margin-bottom: 8px;
}
.quiz-question-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.6;
}
.quiz-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.quiz-option {
  padding: 13px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text2);
  transition: all .15s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.quiz-option:hover:not(.disabled) { border-color: var(--accent); color: var(--text); background: rgba(212,168,83,0.05); }
.quiz-option.correct { background: rgba(92,184,122,0.1); border-color: var(--green); color: var(--green); }
.quiz-option.wrong { background: rgba(224,108,108,0.1); border-color: var(--red); color: var(--red); }
.quiz-option.disabled { cursor: default; }
.option-letter {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  font-weight: 500;
  background: var(--bg4);
  flex-shrink: 0;
  transition: all .15s;
}
.quiz-option.correct .option-letter { background: rgba(92,184,122,0.3); color: var(--green); }
.quiz-option.wrong .option-letter { background: rgba(224,108,108,0.3); color: var(--red); }

.quiz-feedback {
  padding: 14px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.6;
  display: none;
}
.quiz-feedback.correct { background: rgba(92,184,122,0.08); border: 1px solid rgba(92,184,122,0.25); color: #8fcc9f; }
.quiz-feedback.wrong { background: rgba(224,108,108,0.08); border: 1px solid rgba(224,108,108,0.25); color: #e89090; }

/* ── Quiz Result ── */
.quiz-result {
  text-align: center;
  padding: 32px 20px;
}
.result-score {
  font-size: 56px;
  font-weight: 700;
  font-family: 'DM Mono', monospace;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.result-msg { font-size: 16px; color: var(--text2); margin-bottom: 24px; }

/* ── Wrong note ── */
.wrong-note {
  background: rgba(224,108,108,0.06);
  border: 1px solid rgba(224,108,108,0.2);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 10px;
}
.wrong-note-q {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
}
.wrong-note-row {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 12px;
}
.wrong-label-my { color: var(--red); min-width: 60px; }
.wrong-label-correct { color: var(--green); min-width: 60px; }
.wrong-note-explain {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text3);
  line-height: 1.6;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ── Summary notes ── */
.summary-day-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 10px;
  overflow: hidden;
}
.summary-day-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  cursor: pointer;
  transition: background .15s;
}
.summary-day-header:hover { background: var(--bg4); }
.summary-day-title {
  display: flex;
  align-items: center;
  gap: 10px;
}
.summary-day-num {
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  color: var(--accent);
  font-weight: 500;
}
.summary-day-name { font-size: 13px; font-weight: 500; color: var(--text); }
.summary-chevron {
  font-size: 12px;
  color: var(--text3);
  transition: transform .2s;
}
.summary-day-card.open .summary-chevron { transform: rotate(180deg); }
.summary-day-body {
  display: none;
  padding: 0 16px 16px;
  border-top: 1px solid var(--border);
}
.summary-day-card.open .summary-day-body { display: block; }
.summary-term { margin-top: 12px; }
.summary-term-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent2);
  margin-bottom: 2px;
}
.summary-term-desc {
  font-size: 12px;
  color: var(--text3);
  line-height: 1.6;
}

/* ── Study content ── */
.study-content {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text2);
  white-space: pre-wrap;
}
.study-content strong { color: var(--text); font-weight: 700; }
.study-content h3 {
  color: var(--accent);
  font-size: 15px;
  margin: 20px 0 8px;
}
.study-content ul, .study-content ol {
  padding-left: 20px;
  margin: 8px 0;
}
.study-content li { margin-bottom: 4px; }

/* ── Misc ── */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text3);
}
.empty-icon { font-size: 32px; margin-bottom: 12px; }
.empty-text { font-size: 14px; }

.loading-state { text-align: center; padding: 40px; }
.spinner {
  width: 32px; height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; color: var(--text3); }

.tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid;
  margin-right: 4px;
}
.tag-w1 { color: var(--teal); border-color: rgba(91,191,181,0.4); background: rgba(91,191,181,0.08); }
.tag-w2 { color: var(--blue); border-color: rgba(107,159,212,0.4); background: rgba(107,159,212,0.08); }
.tag-w3 { color: var(--purple); border-color: rgba(155,127,212,0.4); background: rgba(155,127,212,0.08); }

.divider { height: 1px; background: var(--border); margin: 20px 0; }

.toast {
  position: fixed;
  bottom: 24px; right: 24px;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text);
  z-index: 999;
  animation: slideUp .3s ease;
  max-width: 280px;
}
@keyframes slideUp { from { opacity:0; transform: translateY(8px); } }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

/* ── Mobile ── */
@media (max-width: 700px) {
  .sidebar { width: 60px; }
  .sidebar .logo-title, .sidebar .logo-sub, .sidebar .nav-label, .nav-item span:not(.nav-icon) { display: none; }
  .main { margin-left: 60px; padding: 20px 16px; }
  .progress-grid { grid-template-columns: repeat(2, 1fr); }
}