:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --paper: #ffffff;
  --ink: #20272d;
  --muted: #65717c;
  --line: #dbe3de;
  --green: #176b5b;
  --blue: #2f6690;
  --amber: #a46400;
  --red: #a64032;
  --soft-green: #e5f2ed;
  --soft-blue: #e7f0f7;
  --soft-amber: #fff1d8;
  --soft-red: #fbe7e2;
  --shadow: 0 18px 48px rgba(32, 39, 45, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(23, 107, 91, 0.09), transparent 310px),
    var(--bg);
  color: var(--ink);
  font-family:
    "Pretendard",
    "Noto Sans KR",
    "Segoe UI",
    system-ui,
    sans-serif;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}

button:hover,
a:hover {
  border-color: var(--green);
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 56px;
}

.top-links {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-bottom: 28px;
}

.top-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--green);
  font-weight: 800;
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 22px;
  align-items: end;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 14px;
  font-weight: 900;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 18px 0 0;
  color: #4b5964;
  font-size: 18px;
  line-height: 1.7;
}

.hero-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.hero-card h2 {
  margin: 0 0 12px;
  font-size: 17px;
}

.hero-card ol {
  margin: 0;
  padding-left: 21px;
  color: #43515d;
  line-height: 1.6;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 32px rgba(32, 39, 45, 0.06);
  backdrop-filter: blur(12px);
}

.filters {
  display: grid;
  gap: 12px;
}

.filter-block span,
.toggles label {
  display: block;
  margin-bottom: 8px;
  color: #344450;
  font-size: 13px;
  font-weight: 800;
}

.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--muted);
}

.chip.active {
  color: var(--green);
  border-color: #9ed8cc;
  background: var(--soft-green);
  font-weight: 800;
}

.tools {
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 12px;
}

#searchInput {
  width: 100%;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.toggles label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: #40505d;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.side-panel {
  display: grid;
  align-content: start;
  gap: 14px;
}

.summary-grid,
.lecture-stats {
  display: grid;
  gap: 8px;
}

.summary-grid article,
.lecture-row {
  min-width: 0;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 12px 28px rgba(32, 39, 45, 0.04);
}

.summary-grid span,
.lecture-row span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.summary-grid strong {
  display: block;
  margin-top: 4px;
  font-size: 24px;
}

.lecture-row {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
}

.mini-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #e4e9ed;
}

.mini-track div {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--blue));
}

.notes-list {
  display: grid;
  gap: 12px;
}

.note-card {
  border: 1px solid var(--line);
  border-left: 6px solid var(--green);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.note-card.review {
  border-left-color: var(--amber);
}

.note-card.uncertain {
  border-left-color: var(--red);
}

.note-card.none {
  border-left-color: var(--blue);
  background: #fbfcff;
}

.note-card.done {
  opacity: 0.74;
}

.note-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  padding: 18px 18px 10px;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.meta-line span {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: #eef2f6;
  color: #40505d;
  font-size: 12px;
  font-weight: 800;
}

.note-head h2 {
  margin: 12px 0 0;
  font-size: 22px;
  line-height: 1.35;
  word-break: keep-all;
}

.done-btn {
  min-height: 38px;
  padding: 0 13px;
  color: var(--green);
  font-weight: 800;
}

.done-btn.active {
  border-color: #9ed8cc;
  background: var(--soft-green);
}

details {
  padding: 0 18px 18px;
}

summary {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--green);
  font-weight: 900;
  cursor: pointer;
}

.note-body {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.note-body section {
  padding: 14px;
  border-radius: 8px;
  background: #f7f9f8;
}

.note-body h3 {
  margin: 0 0 8px;
  color: #344450;
  font-size: 14px;
}

.note-body p,
.note-body li {
  margin: 0;
  color: #43515d;
  line-height: 1.62;
  word-break: keep-all;
}

.note-body ul {
  margin: 0;
  padding-left: 20px;
}

.note-body footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.note-body footer span {
  padding: 7px 9px;
  border-radius: 999px;
  background: #eef2f6;
}

.empty-state {
  min-height: 260px;
  display: grid;
  place-items: center;
  border: 1px dashed #c9d5dc;
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 940px) {
  .hero,
  .toolbar,
  .layout {
    grid-template-columns: 1fr;
  }

  .toolbar {
    position: static;
  }

  .side-panel {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1200px);
    padding-top: 16px;
  }

  .top-links {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .side-panel,
  .lecture-row,
  .note-head {
    grid-template-columns: 1fr;
  }

  .note-head h2 {
    font-size: 19px;
  }

  .done-btn {
    width: 100%;
  }
}