:root {
  --bg: #f3efe6;
  --ink: #1f2a24;
  --ink-soft: #3d4b42;
  --accent: #d9822b;
  --accent-2: #6d8f7c;
  --card: #fffdf7;
  --line: rgba(31, 42, 36, 0.15);
  --shadow: 0 18px 50px rgba(31, 42, 36, 0.15);
}

body[data-theme="toeic"] {
  --bg: #edf4fb;
  --ink: #16324f;
  --ink-soft: #49647e;
  --accent: #1677c8;
  --accent-2: #37a98b;
  --card: #fdfefe;
  --line: rgba(22, 50, 79, 0.14);
  --shadow: 0 20px 46px rgba(22, 50, 79, 0.12);
}

body[data-theme="philosophy"] {
  --bg: #f3eadc;
  --ink: #241c18;
  --ink-soft: #645249;
  --accent: #9f5f2d;
  --accent-2: #6e7d59;
  --card: #fffaf1;
  --line: rgba(36, 28, 24, 0.14);
  --shadow: 0 20px 48px rgba(36, 28, 24, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Cormorant Garamond", "Palatino", "Times New Roman", serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #f5f1ea 0%, #efe6d7 40%, #e6dcc9 100%);
  min-height: 100vh;
}

body.study-page {
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 12%, white) 0%, transparent 30%),
    radial-gradient(circle at bottom right, color-mix(in srgb, var(--accent-2) 15%, white) 0%, transparent 28%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 82%, white), var(--bg));
}

body.home-page {
  background:
    linear-gradient(180deg, #f6f1e8 0%, #ece1ce 100%);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 24px;
  background: linear-gradient(120deg, rgba(217, 130, 43, 0.2), rgba(109, 143, 124, 0.18));
  border-radius: 20px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  animation: fadeSlide 700ms ease-out;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 10% 8% auto auto;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(31, 42, 36, 0.08);
}

.back-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.home-shell {
  max-width: 1280px;
}

.home-main {
  display: grid;
  gap: 24px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.subject-card {
  display: grid;
  gap: 10px;
  min-height: 220px;
  padding: 22px;
  border-radius: 22px;
  background: rgba(255, 253, 247, 0.86);
  border: 1px solid rgba(31, 42, 36, 0.08);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.subject-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 50px rgba(31, 42, 36, 0.16);
  border-color: rgba(31, 42, 36, 0.16);
}

.subject-card[data-theme="toeic"] {
  background: linear-gradient(180deg, rgba(251, 254, 255, 0.94), rgba(231, 242, 253, 0.94));
}

.subject-card[data-theme="philosophy"] {
  background: linear-gradient(180deg, rgba(255, 250, 241, 0.96), rgba(241, 229, 211, 0.96));
}

.subject-card h3 {
  margin: 0;
  font-size: 28px;
}

.subject-description {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.subject-meta {
  margin-top: auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

h1 {
  font-size: 40px;
  margin: 8px 0;
  letter-spacing: 0.02em;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
  color: var(--ink-soft);
}

.subtitle {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 520px;
}

.status {
  font-size: 12px;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(31, 42, 36, 0.9);
  color: #f2efe8;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 24px;
}

.panel {
  background: var(--card);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow);
  animation: fadeRise 700ms ease-out;
}

.controls {
  position: sticky;
  top: 20px;
  align-self: start;
}

.controls h2 {
  margin-top: 0;
  font-size: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}

select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-size: 14px;
  background: #fdfbf6;
}

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

.segmented-btn {
  flex: 1 1 88px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #f7f3ea;
  cursor: pointer;
  transition: transform 200ms ease, background 200ms ease;
}

.segmented-btn.is-active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
  transform: translateY(-1px);
}

.actions {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}

button {
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  background: var(--ink);
  color: #fff;
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(31, 42, 36, 0.2);
}

button.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

button.good {
  background: var(--accent-2);
}

button.primary {
  background: var(--accent);
}

.metrics {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.overview {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: grid;
  gap: 10px;
}

.overview-item {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(217, 130, 43, 0.08);
}

.overview-value {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.5;
}

.study-log {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.history-list {
  display: grid;
  gap: 8px;
  font-size: 13px;
  margin-top: 10px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(31, 42, 36, 0.04);
}
.stats-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.stat-bar {
  height: 6px;
  background: rgba(31, 42, 36, 0.1);
  border-radius: 999px;
  overflow: hidden;
  flex: 1;
  margin: 0 10px;
}

.stat-bar > span {
  display: block;
  height: 100%;
  background: var(--accent-2);
  width: 0%;
}

.metric-label {
  font-size: 12px;
  color: var(--ink-soft);
}

.metric-value {
  font-size: 20px;
  margin: 0;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 360px;
  animation: cardEnter 500ms ease-out;
}

.content {
  background:
    linear-gradient(180deg, rgba(255, 253, 247, 0.95), rgba(255, 253, 247, 0.88)),
    radial-gradient(circle at top right, rgba(217, 130, 43, 0.12), transparent 36%);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(31, 42, 36, 0.55);
}

.card-body {
  font-size: 20px;
  line-height: 1.6;
}

.card-meta {
  display: grid;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(31, 42, 36, 0.04);
}

.meta-block {
  display: grid;
  gap: 6px;
}

.meta-title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(31, 42, 36, 0.6);
}

.meta-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 4px;
  font-size: 14px;
  line-height: 1.5;
}

.tag {
  padding: 6px 10px;
  background: rgba(31, 42, 36, 0.08);
  border-radius: 999px;
  font-size: 12px;
}

.material-card {
  gap: 20px;
}

.material-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}

.material-panel {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(31, 42, 36, 0.045);
  border: 1px solid rgba(31, 42, 36, 0.06);
}

.detail-list {
  display: grid;
  gap: 10px;
}

.detail-item {
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(31, 42, 36, 0.08);
}

.detail-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.detail-label {
  margin: 0 0 4px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(31, 42, 36, 0.55);
}

.detail-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

.material-foot {
  display: flex;
  justify-content: flex-end;
}

.material-source {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

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

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

.option-btn {
  background: #f9f4ea;
  color: var(--ink);
  border: 1px solid var(--line);
  text-align: left;
  padding: 12px 14px;
  border-radius: 12px;
  animation: fadeSlide 350ms ease-out;
}

.option-btn.is-correct {
  border-color: var(--accent-2);
  background: rgba(109, 143, 124, 0.2);
}

.option-btn.is-wrong {
  border-color: #b44d2a;
  background: rgba(180, 77, 42, 0.15);
}

.explain {
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(31, 42, 36, 0.05);
  font-size: 14px;
  line-height: 1.5;
}

.hidden {
  display: none;
}

.footer {
  text-align: center;
  font-size: 12px;
  color: var(--ink-soft);
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeRise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: scale(0.98);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .controls {
    position: static;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .material-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 20px 16px 32px;
  }

  h1 {
    font-size: 32px;
  }

  .panel {
    padding: 18px;
  }

  .card-body {
    font-size: 18px;
  }

  .metrics {
    grid-template-columns: 1fr;
  }
}