:root {
  --paper: #f6efe4;
  --paper-strong: rgba(255, 252, 246, 0.94);
  --ink: #1f2a38;
  --ink-soft: #58606a;
  --brick: #b04e3a;
  --brick-dark: #873a2a;
  --sage: #aab89e;
  --gold: #d0ae63;
  --teal: #1e7a74;
  --line: rgba(31, 42, 56, 0.1);
  --shadow: 0 14px 34px rgba(34, 40, 49, 0.08);
  --radius: 26px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 12%, rgba(208, 174, 99, 0.1), transparent 22%),
    linear-gradient(180deg, #f8f2e8 0%, #f1e7d9 52%, #f7efe5 100%);
}

.ambient {
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: 0;
  border-radius: 999px;
  filter: blur(18px);
  opacity: 0.62;
}

.ambient--one {
  width: 220px;
  height: 220px;
  top: 70px;
  right: 4vw;
  background: rgba(176, 78, 58, 0.08);
}

.ambient--two {
  width: 300px;
  height: 300px;
  bottom: 120px;
  left: 2vw;
  background: rgba(170, 184, 158, 0.11);
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1220px, calc(100% - 32px));
  margin: 28px auto 48px;
}

.panel {
  background: var(--paper-strong);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
  backdrop-filter: blur(10px);
  animation: rise-in 0.75s ease both;
}

.panel + .panel,
.panel + .main-grid,
.main-grid + .panel,
.panel + .practice-grid,
.practice-grid + .panel,
.panel + .footer {
  margin-top: 20px;
}

.hero {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.9fr);
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  inset: -8% auto auto 58%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(176, 78, 58, 0.08), transparent 72%);
  pointer-events: none;
}

.hero__copy,
.hero__stats {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brick);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  line-height: 1.08;
}

h1 {
  font-size: clamp(2.2rem, 4.5vw, 4.1rem);
  max-width: 15ch;
}

h2 {
  font-size: clamp(1.5rem, 2.2vw, 2.35rem);
}

h3 {
  font-size: 1.1rem;
}

p {
  line-height: 1.7;
}

.hero__lead,
.hero__note,
.section-head__hint,
.pattern-card p,
.note-card p,
.path-card p,
.rubric-card p,
.history-item p,
.result-panel p,
.prompt-shell p {
  color: var(--ink-soft);
}

.hero__lead {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: 1.05rem;
}

.hero__note {
  margin-top: 16px;
  max-width: 62ch;
  font-size: 0.95rem;
}

.hero__meta,
.hero__actions,
.inline-controls,
.timer-actions,
.writing-toolbar,
.tag-row,
.result-stats,
.history-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero__meta {
  margin-top: 18px;
}

.hero__meta span,
.chip,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(31, 42, 56, 0.05);
  color: var(--ink);
  font-size: 0.88rem;
}

.button,
.text-button,
select,
textarea,
input {
  font: inherit;
}

.button {
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover,
.text-button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: linear-gradient(135deg, var(--brick), var(--brick-dark));
  color: #fff;
  box-shadow: 0 16px 30px rgba(176, 78, 58, 0.24);
}

.button--ghost {
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  border: 1px solid var(--line);
}

.upload-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.text-button {
  border: none;
  padding: 0;
  background: transparent;
  color: var(--brick);
  cursor: pointer;
  font-weight: 700;
}

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

.stat-card {
  padding: 16px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(31, 42, 56, 0.08);
}

.stat-card--accent {
  background: linear-gradient(135deg, rgba(176, 78, 58, 0.9), rgba(135, 58, 42, 0.94));
  color: #fff;
}

.stat-card--accent .stat-card__label {
  color: rgba(255, 255, 255, 0.78);
}

.stat-card__label {
  display: block;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.stat-card__value {
  display: block;
  margin-top: 6px;
  font-size: 1.95rem;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

.stat-card__value--small {
  font-size: 1.25rem;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-head__tools {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.section-head__hint {
  max-width: 34ch;
  margin: 0;
  text-align: right;
}

.panel > .section-head__hint {
  display: block;
  margin: -6px 0 18px auto;
}

.rubric-grid,
.path-grid,
.pattern-grid,
.result-grid,
.history-list,
.corpus-grid {
  display: grid;
  gap: 16px;
}

.rubric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.rubric-card,
.path-card,
.pattern-card,
.note-card,
.exercise-card,
.result-card,
.history-item,
.feedback-card,
.corpus-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
}

.rubric-card,
.path-card,
.pattern-card,
.note-card,
.result-card,
.history-item,
.feedback-card,
.corpus-card {
  padding: 18px;
}

.note-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.note-card__actions--secondary {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(31, 42, 56, 0.08);
}

.chip--info {
  background: rgba(31, 42, 56, 0.06);
  color: var(--ink);
}

.chip--success {
  background: rgba(30, 122, 116, 0.12);
  color: var(--teal);
}

.chip--warning {
  background: rgba(208, 174, 99, 0.18);
  color: #8a6418;
}

.chip--danger {
  background: rgba(176, 78, 58, 0.12);
  color: #8f3d2d;
}

.path-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.path-card {
  min-height: 200px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: space-between;
}

.path-card__step {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(176, 78, 58, 0.12);
  color: var(--brick);
  font-weight: 700;
}

.main-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1.48fr) minmax(300px, 0.72fr);
  margin-top: 20px;
}

label {
  display: grid;
  gap: 8px;
  font-size: 0.96rem;
}

select,
textarea,
input {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(31, 42, 56, 0.12);
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
}

select {
  min-width: 150px;
  padding: 11px 14px;
}

.pattern-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pattern-card {
  display: grid;
  gap: 12px;
}

.pattern-card--collapsible {
  padding: 0;
  overflow: hidden;
}

.pattern-card__summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 12px;
  padding: 18px;
}

.pattern-card__summary::-webkit-details-marker {
  display: none;
}

.pattern-card__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

.pattern-card__toggle {
  flex: none;
  font-size: 0.86rem;
  color: var(--brick);
  font-weight: 700;
  min-width: 2.6em;
  text-align: right;
}

.pattern-card__preview {
  color: var(--ink-soft);
  line-height: 1.7;
}

.pattern-card__body {
  display: grid;
  gap: 12px;
  padding: 0 18px 18px;
  border-top: 1px solid rgba(31, 42, 56, 0.08);
}

.pattern-card--collapsible[open] .pattern-card__summary {
  padding-bottom: 14px;
}

.pattern-card--collapsible[open] .pattern-card__toggle {
  color: var(--brick-dark);
}

.pattern-card--collapsible[open] .pattern-card__toggle::after {
  content: "收起";
}

.pattern-card--collapsible:not([open]) .pattern-card__toggle::after {
  content: "展开";
}

.pattern-card__structure {
  padding: 16px;
  background: rgba(31, 42, 56, 0.04);
  border-radius: 18px;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: 1rem;
}

.pattern-card__example {
  padding-left: 14px;
  border-left: 3px solid rgba(176, 78, 58, 0.28);
}

.side-panel,
.profile-form,
.note-stack {
  display: grid;
  gap: 12px;
  align-content: start;
}

.cloud-status-stack {
  display: grid;
  gap: 12px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(31, 42, 56, 0.035);
  border: 1px solid rgba(31, 42, 56, 0.08);
}

.cloud-form {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.cloud-form label {
  gap: 6px;
}

.cloud-form .note-card__actions .button,
.note-card__actions--secondary .button {
  flex: 1 1 120px;
}

.exercise-card {
  padding: 24px;
  display: grid;
  gap: 18px;
}

.exercise-title {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.exercise-sentence {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  line-height: 1.9;
}

.blank-input {
  width: min(170px, 100%);
  margin: 0 8px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(31, 42, 56, 0.18);
  background: rgba(255, 252, 246, 0.95);
  text-align: center;
}

.prompt-shell,
.result-panel,
.ai-panel {
  padding: 20px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
}

.prompt-shell {
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.prompt-upload-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 8px 0 14px;
  padding: 16px 18px;
  border: 1px solid rgba(31, 42, 56, 0.08);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.82);
}

.prompt-upload-panel__copy {
  display: grid;
  gap: 6px;
  flex: 1 1 320px;
}

.prompt-upload-panel__copy p {
  margin: 0;
  color: var(--ink-soft);
}

.prompt-upload-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.prompt-image-preview {
  margin-bottom: 16px;
}

.prompt-image-preview__empty {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px dashed rgba(31, 42, 56, 0.16);
  background: rgba(255, 255, 255, 0.62);
}

.prompt-image-preview__empty strong,
.prompt-image-card strong {
  display: block;
}

.prompt-image-preview__empty p {
  margin: 6px 0 0;
  color: var(--ink-soft);
}

.prompt-image-card {
  margin: 0;
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid rgba(31, 42, 56, 0.08);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
}

.prompt-image-card img {
  width: 100%;
  max-height: 320px;
  object-fit: contain;
  border-radius: 16px;
  background: rgba(31, 42, 56, 0.04);
}

.prompt-image-card figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  color: var(--ink-soft);
}

.prompt-image-card--inline img {
  max-height: 260px;
}

.prompt-shell ul,
.result-panel ul,
.pattern-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

.prompt-shell li,
.result-panel li,
.pattern-card li {
  margin-top: 6px;
}

.prompt-shell strong,
.pattern-card strong {
  color: var(--ink);
}

.idea-toggle {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(31, 42, 56, 0.04);
  overflow: hidden;
}

.idea-toggle summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 700;
  color: var(--brick);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.idea-toggle summary::-webkit-details-marker {
  display: none;
}

.idea-toggle summary::after {
  content: "+";
  font-size: 1.1rem;
}

.idea-toggle[open] summary::after {
  content: "-";
}

.idea-toggle[open] summary {
  border-bottom: 1px solid var(--line);
}

.idea-toggle__body {
  display: grid;
  gap: 14px;
  padding: 14px 16px 16px;
}

.idea-toggle__body ul {
  margin-top: 8px;
}

.practice-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

.field-label {
  margin-top: 6px;
  margin-bottom: 8px;
  display: inline-block;
  font-weight: 700;
}

.writing-box,
.support-box {
  resize: vertical;
  padding: 18px;
  min-height: 210px;
  line-height: 1.7;
}

.writing-box--large {
  min-height: 340px;
}

.support-box {
  min-height: 120px;
}

.writing-toolbar {
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.word-counter {
  color: var(--ink-soft);
  font-weight: 700;
}

.timer-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(31, 42, 56, 0.04);
}

.timer-display {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  color: var(--brick);
}

.feedback-grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.result-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.result-card__score {
  font-size: 2rem;
  color: var(--brick);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

.score-strip {
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 42, 56, 0.08);
  overflow: hidden;
  margin-top: 10px;
}

.score-strip span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold), var(--brick));
}

.history-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.corpus-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.history-item {
  display: grid;
  gap: 12px;
}

.corpus-card {
  display: grid;
  gap: 14px;
}

.corpus-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

.corpus-card li + li {
  margin-top: 6px;
}

.corpus-card__count {
  color: var(--brick);
  font-weight: 700;
}

.history-item__band {
  font-size: 2rem;
  color: var(--brick);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

.history-item__band--compact {
  font-size: 1.55rem;
}

.feedback {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 16px;
}

.feedback--warning {
  color: #8a4d12;
  background: rgba(208, 174, 99, 0.14);
}

.feedback--danger {
  color: #8e3d2c;
  background: rgba(176, 78, 58, 0.14);
}

.analysis-shell,
.correction-item,
.material-card {
  margin-top: 16px;
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
}

.analysis-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.analysis-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
}

.analysis-card strong {
  display: block;
  margin-top: 10px;
  font-size: 1.6rem;
}

.note-card p,
.feedback-card p,
.history-item p {
  margin: 0;
}

.correction-list,
.prompt-list,
.material-strip {
  display: grid;
  gap: 12px;
}

.compare-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.compare-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
}

.compare-card__text {
  white-space: pre-wrap;
  line-height: 1.8;
  color: var(--ink-soft);
}

.diff-token--removed {
  color: #8f3d2d;
  background: rgba(176, 78, 58, 0.12);
  text-decoration: line-through;
  border-radius: 6px;
}

.diff-token--added {
  color: #8f3d2d;
  background: rgba(176, 78, 58, 0.16);
  border-radius: 6px;
  font-weight: 700;
}

.language-grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.language-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
}

.language-card ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--ink-soft);
}

.language-card li + li {
  margin-top: 8px;
}

.footer {
  text-align: center;
  color: var(--ink-soft);
  padding: 20px 6px 8px;
}

.empty-state {
  padding: 22px;
  border: 1px dashed rgba(31, 42, 56, 0.18);
  border-radius: 22px;
  color: var(--ink-soft);
  text-align: center;
  background: rgba(255, 255, 255, 0.48);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .hero,
  .main-grid,
  .practice-grid {
    grid-template-columns: 1fr;
  }

  .rubric-grid,
  .path-grid,
  .history-list,
  .corpus-grid,
  .analysis-grid,
  .feedback-grid,
  .language-grid,
  .compare-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .section-head__tools {
    justify-items: start;
  }

  .section-head__hint {
    text-align: left;
  }

  .panel > .section-head__hint {
    margin: 0 0 18px;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 18px, 100%);
    margin-top: 18px;
  }

  .panel {
    padding: 20px;
    border-radius: 22px;
  }

  .rubric-grid,
  .path-grid,
  .pattern-grid,
  .result-grid,
  .history-list,
  .corpus-grid,
  .analysis-grid,
  .feedback-grid,
  .language-grid,
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .button,
  select {
    width: 100%;
  }

  .hero__actions,
  .inline-controls,
  .writing-toolbar,
  .timer-actions {
    flex-direction: column;
    align-items: stretch;
  }
}