/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-tap-highlight-color: transparent; }
body {
  font-family: 'Source Serif 4', 'Noto Serif SC', 'STSong', serif;
  background: #fcf9f1;
  background-image: url("https://www.transparenttextures.com/patterns/natural-paper.png");
  color: #1c1c17;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; font-size: inherit; }
button:disabled { opacity: 0.4; cursor: not-allowed; }
input, textarea { font-family: 'Courier Prime', 'PingFang SC', monospace; }
.hidden { display: none !important; }

/* ===== CSS Custom Properties ===== */
:root {
  --surface: #fcf9f1;
  --surface-dim: #dcdad2;
  --surface-low: #f6f3eb;
  --surface-container: #f1eee6;
  --surface-high: #ebe8e0;
  --surface-highest: #e5e2da;
  --on-surface: #1c1c17;
  --on-surface-variant: #484740;
  --outline: #79776f;
  --outline-variant: #cac6bd;
  --secondary: #7b5455;
  --secondary-container: #fecbcb;
  --tertiary: #101d0f;
  --tertiary-fixed: #d7e7d1;
  --error: #ba1a1a;
  --accent: #c0392b;
  --shadow-warm: rgba(47,46,44,0.08);
  --shadow-warm-strong: rgba(47,46,44,0.12);
  --font-display: 'Libre Caslon Text', 'Noto Serif SC', serif;
  --font-body: 'Source Serif 4', 'Noto Serif SC', 'STSong', serif;
  --font-mono: 'Courier Prime', 'PingFang SC', monospace;
  --container-max: 1100px;
  --gutter: 24px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cac6bd; border-radius: 3px; }

/* ===== App Container ===== */
#app {
  max-width: var(--container-max);
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
}

/* ===== Screen ===== */
.screen { display: none; padding: 20px; animation: fadeIn 0.4s ease; }
.screen.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Welcome Screen ===== */
#screen-welcome {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 80px 20px 40px;
  background: #fcf9f1;
  background-image: url("https://www.transparenttextures.com/patterns/natural-paper.png");
  position: relative;
  overflow: hidden;
}
#screen-welcome.active { display: flex; }

/* Magazine masthead */
.magazine-masthead {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 48px;
  border-bottom: 1px solid rgba(202,198,189,0.35);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  background: rgba(252,249,241,0.7);
  backdrop-filter: blur(6px);
  z-index: 2;
  pointer-events: none;
}
.masthead-logo {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--on-surface);
  font-weight: 600;
}
.masthead-meta {
  letter-spacing: 0.12em;
  font-size: 9px;
}

/* Magazine decorative rule */
.magazine-rule {
  position: absolute;
  top: 48px; left: 48px; right: 48px;
  height: 0;
  border-top: 1px solid rgba(202,198,189,0.15);
  z-index: 2;
  pointer-events: none;
}

/* Poetry excerpt cards (decorative background) */
.poetry-card {
  position: absolute;
  padding: 14px 18px 10px;
  background: rgba(252,249,241,0.65);
  backdrop-filter: blur(2px);
  border: 1px solid rgba(202,198,189,0.2);
  box-shadow: 0px 3px 10px rgba(140,130,110,0.06);
  pointer-events: none;
  z-index: 0;
  transform: rotate(var(--rot, 0deg));
  max-width: 200px;
  transition: opacity 0.6s ease;
}
.poetry-card p {
  font-family: 'Noto Serif SC', 'STSong', serif;
  font-size: 11px;
  line-height: 1.8;
  color: var(--on-surface-variant);
  letter-spacing: 0.04em;
  font-style: italic;
  opacity: 0.55;
  margin-bottom: 6px;
}
.poetry-card-source {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  color: var(--outline);
  opacity: 0.4;
  display: block;
  text-align: right;
}
.welcome-card {
  background: rgba(252,249,241,0.95);
  padding: 56px 48px 48px;
  box-shadow: 0px 8px 32px rgba(47,46,44,0.1), 0px 0px 0px 1px rgba(202,198,189,0.25);
  max-width: 480px;
  width: 100%;
  position: relative;
  z-index: 3;
  backdrop-filter: blur(4px);
}
.welcome-card::before {
  content: '';
  position: absolute;
  top: -6px; left: 20%; right: 20%; height: 14px;
  background: rgba(246,243,235,0.5);
  backdrop-filter: blur(1px);
  box-shadow: inset 0 0 4px rgba(0,0,0,0.04);
  transform: rotate(-0.5deg);
}
.welcome-card::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 30%; right: 30%; height: 10px;
  background: rgba(246,243,235,0.4);
  backdrop-filter: blur(1px);
  box-shadow: inset 0 0 4px rgba(0,0,0,0.04);
  transform: rotate(0.3deg);
}
.welcome-scissors {
  font-size: 36px;
  margin-bottom: 16px;
  display: block;
  opacity: 0.6;
  animation: scissorsSnip 2s ease-in-out infinite;
}
@keyframes scissorsSnip {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(-8deg) scale(1.05); }
  50% { transform: rotate(0deg) scale(1); }
  75% { transform: rotate(5deg) scale(1.02); }
}

/* Floating paper pieces */
.paper-floating {
  position: absolute;
  border: 1px solid rgba(202,198,189,0.3);
  pointer-events: none;
  animation: paperFloat 6s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  box-shadow: 0px 2px 6px var(--shadow-warm);
}
@keyframes paperFloat {
  0%, 100% { transform: translateY(0px) rotate(var(--rot, 0deg)); opacity: 0.4; }
  25% { transform: translateY(-18px) rotate(calc(var(--rot, 0deg) + 2deg)); opacity: 0.6; }
  50% { transform: translateY(0px) rotate(var(--rot, 0deg)); opacity: 0.35; }
  75% { transform: translateY(12px) rotate(calc(var(--rot, 0deg) - 1deg)); opacity: 0.55; }
}

/* Background poetry text */
.welcome-bg-text {
  position: absolute;
  bottom: 15%;
  right: 8%;
  font-family: var(--font-body);
  font-size: 12px;
  font-style: italic;
  color: var(--outline-variant);
  line-height: 2.2;
  letter-spacing: 0.04em;
  max-width: 300px;
  text-align: right;
  pointer-events: none;
  animation: textPulse 8s ease-in-out infinite;
  white-space: pre-line;
}
.welcome-bg-text-2 {
  top: 12%;
  left: 6%;
  text-align: left;
  animation-delay: 3s;
  max-width: 260px;
  font-size: 11px;
}
@keyframes textPulse {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.35; }
}

/* Typewriter effect */
.typewriter-text {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--secondary);
  animation: typing 3s steps(18) 0.5s forwards, blink 0.8s step-end 4s 3;
  max-width: 0;
}
@keyframes typing {
  to { max-width: 18em; }
}
@keyframes blink {
  50% { border-color: transparent; }
}
.welcome-card h1 {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 400;
  line-height: 56px;
  letter-spacing: -0.02em;
  color: #1a1918;
  margin-bottom: 12px;
}
@media (max-width: 640px) {
  .welcome-card h1 { font-size: 32px; line-height: 40px; }
  .welcome-card { padding: 40px 24px 32px; }
  .poetry-card { display: none; }
  .magazine-masthead { padding: 10px 20px; font-size: 8px; }
  .magazine-rule { left: 20px; right: 20px; }
  #screen-welcome { padding: 60px 16px 30px; }
}
@media (min-width: 641px) and (max-width: 960px) {
  .poetry-card { max-width: 130px; opacity: 0.4; }
}
.welcome-desc {
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--on-surface-variant);
  margin-bottom: 36px;
  line-height: 1.6;
}
.age-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  margin-bottom: 16px;
}
.age-options {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.age-btn {
  flex: 1;
  padding: 18px 12px 14px;
  border: 1px solid var(--outline-variant);
  background: var(--surface-low);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  cursor: pointer;
}
.age-btn:hover {
  border-color: var(--accent);
  box-shadow: 0px 4px 12px var(--shadow-warm);
  transform: translateY(-2px);
}
.age-btn.selected {
  border-color: var(--accent);
  background: #fdf0eb;
  color: var(--accent);
  box-shadow: 0px 4px 12px var(--shadow-warm);
}
.age-icon { font-size: 22px; line-height: 1; }
.welcome-hint {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--outline);
  letter-spacing: 0.02em;
}
.btn-start {
  margin-top: 28px;
  padding: 12px 56px;
  background: #1a1918;
  color: white;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: all 0.2s;
  box-shadow: 0px 4px 12px var(--shadow-warm);
  position: relative;
  z-index: 3;
}
.btn-start:disabled {
  background: var(--surface-highest);
  color: var(--outline);
  box-shadow: none;
}
.btn-start:not(:disabled):hover {
  background: var(--secondary);
  box-shadow: 0px 8px 20px var(--shadow-warm-strong);
  transform: translateY(-2px);
}

/* ===== Header ===== */
#main-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: rgba(252,249,241,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(202,198,189,0.25);
  position: sticky;
  top: 0;
  z-index: 100;
}
#main-header.active { display: flex !important; }
.header-left {
  display: flex;
  align-items: center;
  gap: 20px;
}
.logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 400;
  color: #1a1918;
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.header-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--outline);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: none;
}
#main-header.active .header-subtitle { display: inline; }
@media (max-width: 640px) {
  .header-subtitle { display: none !important; }
}
.level-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
}
.level-dot {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 10px;
  background: var(--surface-low);
  color: var(--outline);
  border: 1px solid transparent;
  transition: all 0.3s;
}
.level-dot.active {
  background: #1a1918;
  color: white;
  border-color: #1a1918;
}
.level-dot.done {
  background: transparent;
  color: var(--on-surface-variant);
  border-color: var(--outline-variant);
}
.level-arrow { color: var(--outline-variant); font-size: 12px; margin: 0 2px; }
.header-right {
  display: flex;
  gap: 6px;
}
.btn-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--on-surface-variant);
  transition: all 0.2s;
  border: 1px solid transparent;
}
.btn-icon:hover {
  border-color: var(--outline-variant);
  background: var(--surface-low);
}
.btn-help {
  -webkit-appearance: none;
  appearance: none;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 400;
  width: auto;
  height: auto;
  min-width: 0;
  padding: 0 2px;
  margin: 0;
  border: none;
  outline: none;
  background: transparent;
  color: var(--outline);
  box-shadow: none;
  border-radius: 0;
  transition: all 0.2s;
}
.btn-help:hover {
  color: var(--secondary);
  background: transparent;
  border: none;
  box-shadow: none;
}
.btn-help:focus,
.btn-help:focus-visible,
.btn-help:active {
  outline: none;
  border: none;
  background: transparent;
  box-shadow: none;
}

/* ===== Buttons ===== */
.btn {
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all 0.2s;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary {
  background: #1a1918;
  color: white;
  box-shadow: 0px 2px 6px var(--shadow-warm);
}
.btn-primary:hover { background: var(--secondary); box-shadow: 0px 6px 16px var(--shadow-warm-strong); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-outline {
  border: 1px solid var(--outline-variant);
  color: var(--on-surface-variant);
  background: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  box-shadow: 0px 4px 12px var(--shadow-warm);
  transform: translateY(-1px);
}
.btn-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--outline);
  padding: 6px 10px;
}
.btn-text:hover { color: var(--secondary); }
.btn-sm { padding: 8px 16px; font-size: 11px; }

/* ===== Level 1: Text Browsing ===== */
.level-header { margin-bottom: 20px; }
.level-header-top {
  display: flex;
  align-items: center;
  gap: 12px;
}
.level-header-top h2 { margin-bottom: 0; }
.level-header h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  line-height: 32px;
  color: #1a1918;
  margin-bottom: 6px;
}
.level-desc {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--on-surface-variant);
  line-height: 1.6;
}
.back-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--outline);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s;
  text-decoration: none;
}
.back-link:hover { color: var(--secondary); }
.selection-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--surface-low);
  border: 1px solid var(--outline-variant);
  margin-bottom: 24px;
  position: relative;
}
.selection-bar::before {
  content: '';
  position: absolute;
  top: -3px; left: 10%; width: 30px; height: 8px;
  background: rgba(254,203,203,0.4);
  transform: rotate(-4deg);
  pointer-events: none;
}
.selection-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
}
.selection-actions { display: flex; gap: 8px; }

.text-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.text-card {
  padding: 24px;
  box-shadow: 0px 6px 16px var(--shadow-warm);
  border: 1px solid rgba(202,198,189,0.3);
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  display: flex;
  flex-direction: column;
}
.text-card:hover {
  transform: scale(1.02) rotate(0deg) !important;
  z-index: 10;
  box-shadow: 0px 16px 32px var(--shadow-warm-strong);
}
.text-card.selected {
  border-color: #b8a68b !important;
  background: #f3ede3 !important;
  box-shadow: 0px 8px 20px var(--shadow-warm-strong);
}

/* Paper type variations */
.text-card[data-paper="newsprint"] { background: #efe6cc; }
.text-card[data-paper="newsprint"]::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(180,160,120,0.08) 40px, rgba(180,160,120,0.08) 41px);
  pointer-events: none;
}
.text-card[data-paper="magazine"] { background: #fdfaf3; }
.text-card[data-paper="magazine"]::after {
  content: '';
  position: absolute; top: 20px; right: 0; width: 3px; height: 60px;
  background: var(--secondary); opacity: 0.15;
  pointer-events: none;
}
.text-card[data-paper="letter"] { background: #faf5ed; }
.text-card[data-paper="letter"]::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 24px, rgba(140,160,200,0.08) 24px, rgba(140,160,200,0.08) 25px);
  pointer-events: none;
}
.text-card[data-paper="notebook"] { background: #f7f2e6; }
.text-card[data-paper="notebook"]::after {
  content: '';
  position: absolute; top: 0; left: -1px; width: 2px; height: 100%;
  background: rgba(180,100,80,0.12);
  pointer-events: none;
}
.text-card[data-paper="aged"] { background: #f0ead6; }
.text-card[data-paper="aged"]::after {
  content: '';
  position: absolute; bottom: 30px; right: 30px; width: 60px; height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(160,130,90,0.08) 30%, transparent 70%);
  pointer-events: none;
}

/* Fold mark */
.text-card .fold-mark {
  position: absolute; top: 0; left: 33%;
  width: 2px; height: 100%;
  background: linear-gradient(to bottom, transparent 0%, rgba(160,140,100,0.06) 20%, rgba(160,140,100,0.06) 80%, transparent 100%);
  pointer-events: none;
}

/* Ink stamp */
.text-card .ink-stamp {
  position: absolute; top: -6px; right: 12px;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid var(--secondary);
  opacity: 0.2;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 7px;
  color: var(--secondary); letter-spacing: 0.1em;
  transform: rotate(15deg);
  pointer-events: none;
  background: transparent;
}
.text-card .ink-stamp::after {
  content: '选录';
  position: absolute;
  text-align: center;
  line-height: 28px;
}

/* Tape strip on cards */
.text-card::before {
  content: '';
  position: absolute;
  top: -5px; left: 50%; transform: translateX(-50%) rotate(-1deg);
  width: 40px; height: 10px;
  background: rgba(246,243,235,0.5);
  backdrop-filter: blur(1px);
  box-shadow: inset 0 0 4px rgba(0,0,0,0.04);
  pointer-events: none;
}
.text-card:nth-child(3n+2)::before { left: 30%; transform: rotate(2deg); width: 35px; }
.text-card:nth-child(3n+3)::before { left: 60%; transform: rotate(-2deg); width: 45px; }

.text-card .card-source {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--outline);
  margin-bottom: 6px;
}
.text-card .card-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 400;
  margin-bottom: 8px;
  color: #1a1918;
}
.text-card .card-category {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 10px;
  background: var(--surface-high);
  color: var(--on-surface-variant);
  margin-bottom: 10px;
  width: fit-content;
  border: 1px solid rgba(202,198,189,0.2);
}
.text-card .card-content {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--on-surface);
  line-height: 1.8;
  flex: 1;
  margin-bottom: 14px;
}
.text-card .card-select-btn {
  align-self: flex-end;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 18px;
  transition: all 0.2s;
  border: none;
}
.text-card .card-select-btn.select {
  background: #1a1918;
  color: white;
  box-shadow: 0px 2px 6px var(--shadow-warm);
}
.text-card .card-select-btn.select:hover {
  background: var(--secondary);
  box-shadow: 0px 6px 14px var(--shadow-warm-strong);
  transform: translateY(-2px);
}
.text-card .card-select-btn.selected {
  background: var(--surface-highest);
  color: var(--on-surface-variant);
  border: 1px solid var(--outline-variant);
}

/* ===== Custom Text Section (Level 1) ===== */
.custom-text-section {
  margin-top: 24px;
  background: var(--surface-low);
  border: 1px solid rgba(202,198,189,0.3);
  overflow: hidden;
  position: relative;
}
.custom-text-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}
.custom-text-header:hover { background: rgba(255,255,255,0.5); }
.custom-text-header span:first-child {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}
.custom-text-arrow {
  font-size: 12px;
  color: var(--outline);
  transition: transform 0.3s ease;
}
.custom-text-section.collapsed .custom-text-arrow {
  transform: rotate(-90deg);
}
.custom-text-section.collapsed .custom-text-body {
  display: none;
}
.custom-text-body {
  padding: 0 20px 16px;
}
.custom-text-desc {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--outline);
  margin-bottom: 12px;
  line-height: 1.6;
}
.custom-text-body textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--outline-variant);
  font-size: 14px;
  line-height: 1.7;
  resize: vertical;
  font-family: var(--font-mono);
  background: rgba(255,255,255,0.7);
  transition: border-color 0.2s, background 0.2s;
}
.custom-text-body textarea:focus {
  outline: none;
  border-color: var(--secondary);
  background: white;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.04);
}
.custom-text-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
}
.custom-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--outline);
}

/* ===== Level 2: Cutting ===== */
.level2-layout {
  display: flex;
  gap: 20px;
  height: calc(100vh - 140px);
}
.level2-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.source-texts {
  flex: 1;
  overflow-y: auto;
  padding-right: 8px;
}
.source-text-item {
  background: linear-gradient(180deg, rgba(255,252,246,0.97) 0%, rgba(244,238,227,0.96) 100%);
  border: 1px solid rgba(182,171,149,0.42);
  padding: 24px 24px 22px;
  margin: 8px 8px 18px 2px;
  box-shadow:
    0 16px 26px rgba(89, 77, 58, 0.08),
    0 5px 10px rgba(89, 77, 58, 0.07),
    0 1px 0 rgba(255,255,255,0.55) inset,
    0 -1px 0 rgba(170,150,120,0.08) inset;
  position: relative;
  overflow: hidden;
  transform: rotate(var(--paper-rot, 0deg));
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.source-text-item:hover {
  transform: translateY(-2px) rotate(var(--paper-rot, 0deg));
  box-shadow:
    0 20px 30px rgba(89, 77, 58, 0.1),
    0 7px 14px rgba(89, 77, 58, 0.08),
    0 1px 0 rgba(255,255,255,0.55) inset,
    0 -1px 0 rgba(170,150,120,0.08) inset;
}
.source-text-item::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 16%;
  width: 54px;
  height: 14px;
  background: linear-gradient(180deg, rgba(247,242,230,0.85) 0%, rgba(232,223,204,0.45) 100%);
  box-shadow: inset 0 0 5px rgba(98, 86, 69, 0.08);
  transform: rotate(-3deg);
  pointer-events: none;
  opacity: 0.95;
}
.source-text-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 14% 16%, rgba(255,255,255,0.5) 0 16px, transparent 22px),
    radial-gradient(circle at 84% 82%, rgba(147, 118, 82, 0.08) 0 24px, transparent 32px),
    repeating-linear-gradient(0deg, rgba(120,101,72,0.02) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(120,101,72,0.018) 0 1px, transparent 1px 30px);
  mix-blend-mode: multiply;
  pointer-events: none;
  opacity: 0.75;
}
.source-text-item:nth-child(3n + 1) {
  --paper-rot: -0.45deg;
}
.source-text-item:nth-child(3n + 2) {
  --paper-rot: 0.35deg;
}
.source-text-item:nth-child(3n + 3) {
  --paper-rot: -0.15deg;
}
.source-text-item[data-paper="newsprint"] {
  background: linear-gradient(180deg, #f4ead2 0%, #eadfc4 100%);
}
.source-text-item[data-paper="magazine"] {
  background: linear-gradient(180deg, #fdfaf3 0%, #f5eee0 100%);
}
.source-text-item[data-paper="letter"] {
  background: linear-gradient(180deg, #fbf5ec 0%, #f4ebdf 100%);
}
.source-text-item[data-paper="notebook"] {
  background: linear-gradient(180deg, #f7f1e4 0%, #efe6d6 100%);
}
.source-text-item[data-paper="aged"] {
  background: linear-gradient(180deg, #efe6d6 0%, #e6dac6 100%);
}
.source-text-item[data-paper="newsprint"]::after {
  background:
    radial-gradient(circle at 14% 16%, rgba(255,255,255,0.4) 0 16px, transparent 22px),
    repeating-linear-gradient(90deg, transparent 0 34px, rgba(148,124,88,0.055) 34px 35px),
    repeating-linear-gradient(0deg, rgba(120,101,72,0.02) 0 1px, transparent 1px 24px);
}
.source-text-item[data-paper="letter"]::after {
  background:
    linear-gradient(90deg, rgba(186, 103, 91, 0.12) 0 2px, transparent 2px),
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(118, 144, 190, 0.085) 31px 32px),
    radial-gradient(circle at 84% 82%, rgba(147, 118, 82, 0.08) 0 22px, transparent 30px);
}
.source-text-item[data-paper="notebook"]::after {
  background:
    linear-gradient(90deg, rgba(176, 104, 84, 0.14) 0 3px, transparent 3px),
    repeating-linear-gradient(0deg, transparent 0 27px, rgba(132, 152, 185, 0.07) 27px 28px),
    radial-gradient(circle at 18% 20%, rgba(255,255,255,0.38) 0 20px, transparent 26px);
}
.source-text-item[data-paper="aged"]::after {
  background:
    radial-gradient(circle at 18% 18%, rgba(255,255,255,0.22) 0 16px, transparent 26px),
    radial-gradient(circle at 82% 74%, rgba(139, 104, 62, 0.12) 0 26px, transparent 34px),
    repeating-linear-gradient(0deg, rgba(120,101,72,0.025) 0 1px, transparent 1px 25px);
}
.source-text-item .sti-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(136, 117, 90, 0.14);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #6d665d;
  position: relative;
  z-index: 1;
}
.source-text-item .sti-title {
  font-family: var(--font-display);
  font-size: 16px;
  color: #1a1918;
  background: rgba(250, 246, 238, 0.78);
  border: 1px solid rgba(184, 172, 151, 0.28);
  padding: 4px 10px 3px;
  box-shadow: 0 2px 4px rgba(93, 79, 59, 0.05);
}
.source-text-item .sti-content {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 2.08;
  user-select: text;
  -webkit-user-select: text;
  position: relative;
  z-index: 1;
  color: #2a2722;
  text-shadow: 0 1px 0 rgba(255,255,255,0.25);
}
.source-text-item .sti-content .highlight-cut {
  background: #ece3d0;
  padding: 2px 4px;
  position: relative;
  border-bottom: 2px solid #b8a68b;
  border-radius: 2px;
}
.source-text-item .sti-fold-mark {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 31%;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(154, 136, 105, 0.09) 16%,
    rgba(154, 136, 105, 0.16) 50%,
    rgba(154, 136, 105, 0.08) 84%,
    transparent 100%
  );
  opacity: 0.7;
  pointer-events: none;
}
.source-text-item .sti-ink-stamp {
  position: absolute;
  top: 12px;
  right: 16px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1.5px solid rgba(123, 84, 85, 0.38);
  color: rgba(123, 84, 85, 0.34);
  transform: rotate(12deg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.08em;
  pointer-events: none;
  z-index: 1;
}
.source-text-item .sti-ink-stamp::after {
  content: '剪读';
}

/* Collection Panel */
.collection-panel {
  width: 260px;
  flex-shrink: 0;
  background: var(--surface-low);
  border: 1px solid rgba(202,198,189,0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0px 4px 12px var(--shadow-warm);
  position: relative;
}
.collection-panel::before {
  content: '';
  position: absolute;
  top: -3px; left: 40%; width: 25px; height: 7px;
  background: rgba(254,203,203,0.35);
  transform: rotate(3deg);
  pointer-events: none;
}
.collection-header {
  padding: 16px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.collection-header h3 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  color: #1a1918;
}
.word-count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--outline);
}
.collection-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}
.collection-body.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--outline-variant);
  letter-spacing: 0.03em;
}
.collection-footer {
  padding: 12px;
  border-top: 1px solid rgba(202,198,189,0.3);
  display: flex;
  gap: 8px;
  justify-content: space-between;
}
.collection-footer .btn { flex: 1; text-align: center; justify-content: center; }

.word-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  background: #fdfaf3;
  border: 1px solid var(--outline-variant);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--on-surface);
  animation: chipIn 0.3s ease;
  cursor: default;
  box-shadow: 0px 1px 3px var(--shadow-warm);
}
.word-chip .chip-del {
  cursor: pointer;
  font-size: 13px;
  color: var(--secondary);
  opacity: 0.5;
  transition: opacity 0.2s;
}
.word-chip .chip-del:hover { opacity: 1; }
@keyframes chipIn { from { transform: scale(0); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Cut Floating Button */
.cut-float-btn {
  position: fixed;
  z-index: 200;
  padding: 10px 20px;
  background: #1a1918;
  color: white;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0px 4px 16px var(--shadow-warm-strong);
  cursor: pointer;
  transition: opacity 0.2s;
  animation: popIn 0.2s ease;
  pointer-events: auto;
  border: none;
}
@keyframes popIn { from { transform: scale(0.8); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Toast */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  background: #1a1918;
  color: white;
  font-family: var(--font-mono);
  font-size: 13px;
  z-index: 600;
  white-space: nowrap;
  animation: toastIn 0.3s ease;
  max-width: 80vw;
  text-align: center;
  pointer-events: none;
  border: none;
}
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(20px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

/* ===== Level 3: Collage ===== */
.level3-layout {
  display: flex;
  gap: 16px;
  height: calc(100vh - 140px);
}

/* Word Bank */
.wordbank-panel {
  width: 200px;
  flex-shrink: 0;
  background: var(--surface-low);
  border: 1px solid rgba(202,198,189,0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0px 4px 12px var(--shadow-warm);
}
.wordbank-header {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.wordbank-header h3 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 400;
  color: #1a1918;
}
.wordbank-header span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--outline);
  background: var(--surface-container);
  padding: 2px 10px;
}
.wordbank-body {
  flex: 1;
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
  scrollbar-width: auto;
  scrollbar-color: #9b876b rgba(210, 198, 177, 0.45);
}
.wordbank-body::-webkit-scrollbar {
  width: 8px;
}
.wordbank-body::-webkit-scrollbar-track {
  background: rgba(210, 198, 177, 0.38);
  border-radius: 999px;
}
.wordbank-body::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #b69b74 0%, #8c7354 100%);
  border-radius: 999px;
}
.wordbank-body::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #c4aa83 0%, #826949 100%);
}
.wordbank-hint {
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--outline);
  text-align: center;
  border-top: 1px solid rgba(202,198,189,0.3);
}
.wordbank-word {
  display: inline-block;
  padding: 6px 14px;
  background: #fdfaf3;
  border: 1px solid var(--outline-variant);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: grab;
  transition: all 0.15s;
  user-select: none;
  touch-action: none;
  box-shadow: 0px 1px 3px var(--shadow-warm);
}
.wordbank-word:hover {
  background: var(--surface-low);
  box-shadow: 0px 4px 10px var(--shadow-warm);
  transform: translateY(-2px);
}
.wordbank-word:active { cursor: grabbing; }
.wordbank-word.dragging {
  opacity: 0.5;
  transform: scale(0.95);
}

/* Function Word Panel */
.funcword-panel {
  width: 200px;
  flex-shrink: 0;
  background: var(--surface-low);
  border: 1px solid rgba(202,198,189,0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 180px;
  transition: max-height 0.3s ease;
  box-shadow: 0px 4px 12px var(--shadow-warm);
}
.funcword-panel.collapsed {
  max-height: 40px;
}
.funcword-header {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
}
.funcword-header:hover { background: rgba(255,255,255,0.4); }
.funcword-arrow {
  transition: transform 0.3s ease;
  font-size: 12px;
}
.funcword-panel.collapsed .funcword-arrow {
  transform: rotate(-90deg);
}
.funcword-body {
  flex: 1;
  padding: 8px 10px;
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-content: flex-start;
}
.funcword-word {
  display: inline-block;
  padding: 6px 12px;
  background: transparent;
  border: 1px dashed var(--outline-variant);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--outline);
  cursor: grab;
  transition: all 0.15s;
  user-select: none;
  touch-action: none;
}
.funcword-word:hover {
  border-color: var(--on-surface-variant);
  color: var(--on-surface-variant);
  background: rgba(255,255,255,0.3);
  transform: translateY(-1px);
}

/* Layout Mode Selector */
.layout-mode-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
}
.mode-btn {
  padding: 5px 12px;
  border: 1px solid var(--outline-variant);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--on-surface-variant);
}
.mode-btn:hover {
  border-color: var(--outline);
  background: var(--surface-low);
}
.mode-btn.active {
  background: #1a1918;
  border-color: #1a1918;
  color: white;
}

/* Canvas Area */
.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 10px;
  gap: 14px;
  flex-wrap: wrap;
}
.poem-tabs {
  display: flex;
  gap: 6px;
  flex: 1;
  overflow-x: auto;
  min-width: 0;
}
.poem-tab {
  padding: 6px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  background: var(--surface-low);
  color: var(--outline);
  white-space: nowrap;
  transition: all 0.2s;
}
.poem-tab.active {
  background: #1a1918;
  color: white;
}
.poem-tab:hover:not(.active) { background: var(--surface-container); color: var(--on-surface-variant); }
.toolbar-author {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.canvas-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  margin-left: auto;
}

/* Canvas */
.canvas-container {
  flex: 1;
  background: var(--surface);
  border: 1px solid rgba(202,198,189,0.2);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  box-shadow: 0px 4px 16px var(--shadow-warm);
}
.canvas {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--surface);
  background-image: radial-gradient(var(--surface-dim) 0.5px, transparent 0.5px);
  background-size: 24px 24px;
  cursor: default;
  min-height: 400px;
}
.canvas-placeholder {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--outline-variant);
  pointer-events: none;
}
.canvas-placeholder p { font-family: var(--font-body); font-size: 16px; }
.canvas-placeholder .sub { font-family: var(--font-mono); font-size: 12px; margin-top: 4px; letter-spacing: 0.03em; }

/* Canvas Word */
/* Cut-shape variations for scissor-cut effect */
:root {
  --cut-1: polygon(2% 0%, 98% 1%, 100% 3%, 99% 97%, 97% 100%, 1% 99%, 0% 96%, 0% 3%);
  --cut-2: polygon(0% 1%, 97% 0%, 100% 4%, 99% 96%, 96% 100%, 3% 99%, 0% 97%, 1% 2%);
  --cut-3: polygon(1% 2%, 99% 0%, 100% 2%, 98% 98%, 100% 100%, 2% 99%, 0% 97%, 2% 1%);
  --cut-4: polygon(2% 0%, 98% 2%, 100% 0%, 97% 97%, 100% 100%, 1% 98%, 0% 100%, 3% 2%);
  --cut-5: polygon(0% 0%, 100% 1%, 99% 3%, 96% 97%, 100% 100%, 2% 99%, 0% 96%, 3% 3%);
  --cut-6: polygon(1% 2%, 99% 0%, 100% 5%, 98% 95%, 100% 99%, 3% 100%, 0% 97%, 2% 3%);
}

.canvas-word {
  position: absolute;
  cursor: move;
  user-select: none;
  touch-action: none;
  transition: box-shadow 0.2s;
  line-height: 1.2;
  text-align: center;
  filter: drop-shadow(1px 2px 3px var(--shadow-warm));
}
.canvas-word:hover { z-index: 10; filter: drop-shadow(2px 3px 8px var(--shadow-warm-strong)); }
.canvas-word .cw-text {
  display: inline-block;
  padding: 4px 10px;
  word-break: keep-all;
  white-space: nowrap;
  clip-path: var(--cut-shape, none);
  background: rgba(252,249,241,0.85);
}
.canvas-word .cw-remove {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 18px;
  height: 18px;
  background: var(--secondary);
  color: white;
  font-size: 10px;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 5;
}
.canvas-word:hover .cw-remove { display: flex; }

/* Function words on canvas have a distinctive dashed style */
.canvas-word.func-word .cw-text {
  border-bottom: 2px dashed var(--outline-variant);
  color: var(--outline);
  font-size: 14px !important;
  padding: 2px 6px;
  letter-spacing: 0;
  opacity: 0.7;
  background: transparent;
}
.canvas-word .cw-rotate {
  position: absolute;
  bottom: -12px;
  right: -8px;
  width: 20px;
  height: 20px;
  cursor: grab;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--outline);
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--outline-variant);
}
.canvas-word:hover .cw-rotate { display: flex; }

/* Style Selector */
.style-selector {
  padding: 8px 16px;
  border-top: 1px solid rgba(202,198,189,0.2);
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-low);
}
.style-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--outline);
}
.style-btn {
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: transparent;
  color: var(--on-surface-variant);
  border: 1px solid transparent;
  transition: all 0.2s;
}
.style-btn:hover { border-color: var(--outline-variant); }
.style-btn.active { background: var(--surface-high); border-color: var(--outline-variant); color: #1a1918; }

/* ===== Overlay ===== */
.overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(28,28,23,0.5);
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}
.overlay.active { display: flex; }

/* AI Modal */
.ai-modal {
  background: var(--surface);
  width: 90%;
  max-width: 520px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0px 20px 60px rgba(47,46,44,0.2);
  animation: modalIn 0.3s ease;
  border: 1px solid rgba(202,198,189,0.2);
}
@keyframes modalIn { from { transform: scale(0.95) translateY(10px); opacity: 0; } to { transform: scale(1) translateY(0); opacity: 1; } }
.ai-modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.ai-modal-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: #1a1918;
}
.ai-modal-body { padding: 24px; max-height: 60vh; overflow-y: auto; }
.ai-result {
  background: var(--surface-low);
  padding: 24px;
  line-height: 1.8;
  text-align: left;
  font-family: var(--font-body);
  font-size: 14px;
  border: 1px solid rgba(202,198,189,0.2);
}

/* Review stats row */
.review-stats {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.review-stats span {
  background: white;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--on-surface-variant);
  box-shadow: 0px 1px 3px var(--shadow-warm);
}
.review-stats strong {
  font-family: var(--font-display);
  font-size: 18px;
  color: #1a1918;
}

/* Theme & mood badges */
.review-badges {
  text-align: center;
  margin-bottom: 20px;
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.review-badge {
  display: inline-block;
  padding: 4px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  font-weight: 400;
  border: 1px solid transparent;
}
.review-badge.theme {
  background: var(--tertiary-fixed);
  color: var(--tertiary);
}
.review-badge.mood {
  background: var(--secondary-container);
  color: var(--secondary);
}

/* Highlights list */
.review-highlights {
  margin-bottom: 20px;
}
.review-highlight {
  padding: 8px 12px;
  border-left: 3px solid var(--outline-variant);
  margin-bottom: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--on-surface);
  line-height: 1.6;
}

/* Overall comment */
.review-comment {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--on-surface-variant);
  line-height: 1.8;
  padding: 16px 20px;
  background: white;
  font-style: italic;
  border: 1px solid rgba(202,198,189,0.2);
}

/* AI loading state */
.review-loading {
  text-align: center;
  padding: 40px 20px;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--on-surface-variant);
  animation: loadingPulse 1.5s ease-in-out infinite;
}
@keyframes loadingPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* AI response text */
.ai-response-text {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.9;
  color: var(--on-surface);
  white-space: pre-wrap;
  word-break: break-word;
}
.ai-response-text h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 400;
  color: #1a1918;
  margin: 20px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(202,198,189,0.2);
}
.ai-response-text h3:first-child { margin-top: 0; }
.ai-response-text p { margin-bottom: 12px; }
.ai-response-text strong { color: #1a1918; }
.ai-response-text em { color: var(--on-surface-variant); }

.ai-modal-footer {
  padding: 16px 24px 24px;
  display: flex;
  justify-content: center;
}

/* Settings Modal */
.settings-modal {
  background: var(--surface);
  width: 90%;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0px 20px 60px rgba(47,46,44,0.2);
  animation: modalIn 0.3s ease;
  border: 1px solid rgba(202,198,189,0.2);
}
.settings-header {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.settings-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: #1a1918;
}
.settings-body { padding: 20px 24px; }
.setting-item {
  margin-bottom: 24px;
}
.setting-item label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 10px;
  color: var(--on-surface-variant);
}
.setting-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.setting-btn {
  padding: 8px 16px;
  border: 1px solid var(--outline-variant);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
  transition: all 0.2s;
  background: transparent;
  cursor: pointer;
}
.setting-btn:hover { border-color: var(--secondary); color: var(--secondary); }
.setting-btn.active { border-color: var(--secondary); background: var(--secondary-container); color: var(--secondary); }
.setting-option-text p {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--on-surface-variant);
  margin-bottom: 8px;
}
.setting-option-text textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--outline-variant);
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  transition: border-color 0.2s;
  background: rgba(255,255,255,0.7);
}
.setting-option-text textarea:focus { outline: none; border-color: var(--secondary); background: white; }
.custom-count { font-family: var(--font-mono); font-size: 11px; color: var(--outline); margin-top: 6px; }

/* Confirm Modal */
.confirm-modal {
  background: var(--surface);
  border: 1px solid rgba(202,198,189,0.2);
  padding: 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0px 20px 60px rgba(47,46,44,0.2);
  animation: modalIn 0.3s ease;
}
.confirm-modal p {
  font-family: var(--font-body);
  font-size: 16px;
  margin-bottom: 24px;
}
.confirm-actions { display: flex; gap: 12px; justify-content: center; }

/* ===== Dragover Highlight ===== */
.canvas.drag-over { background: rgba(254,203,203,0.15); }

/* ===== Export Styles ===== */

/* -- Newpaper Style -- */
.export-newspaper {
  background: #efe6cc;
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(160,140,100,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(160,140,100,0.1) 0%, transparent 50%),
    repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(180,160,120,0.05) 40px, rgba(180,160,120,0.05) 41px);
}
.export-newspaper .cw-text {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', 'STSong', serif;
  box-shadow: none;
  letter-spacing: 1px;
}

/* -- Journal Style -- */
.export-journal {
  background: #fffdf3;
  background-image:
    linear-gradient(rgba(200,180,160,0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200,180,160,0.15) 1px, transparent 1px);
  background-size: 20px 20px;
}
.export-journal .cw-text {
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  border-bottom: 2px solid #e8c8a0;
  padding-bottom: 2px;
}

/* -- Ink Style -- */
.export-ink {
  background: #f5f0e6;
  background-image:
    radial-gradient(ellipse at 30% 20%, rgba(0,0,0,0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(0,0,0,0.02) 0%, transparent 50%);
}
.export-ink .cw-text {
  font-family: 'STKaiti', 'KaiTi', 'Noto Serif SC', serif;
  color: #1a1a1a;
  letter-spacing: 3px;
}

/* -- Modern Style -- */
.export-modern {
  background: #ffffff;
}
.export-modern .cw-text {
  font-family: -apple-system, 'PingFang SC', sans-serif;
  font-weight: 300;
  color: #333;
  letter-spacing: 2px;
}

/* ===== Canvas Live Preview ===== */
.canvas.preview-newspaper { background: #efe6cc; background-image: radial-gradient(rgba(180,160,120,0.08) 0.5px, transparent 0.5px); background-size: 24px 24px; }
.canvas.preview-newspaper .canvas-word .cw-text {
  font-family: 'Noto Serif SC', 'STSong', serif;
}
.canvas.preview-journal { background: #fffdf3; background-image: radial-gradient(rgba(200,180,160,0.12) 0.5px, transparent 0.5px); background-size: 24px 24px; }
.canvas.preview-journal .canvas-word .cw-text {
  border-bottom: 2px solid #e8c8a0;
  padding-bottom: 2px;
  font-family: 'PingFang SC', sans-serif;
}
.canvas.preview-ink { background: #f5f0e6; background-image: radial-gradient(rgba(0,0,0,0.03) 0.5px, transparent 0.5px); background-size: 24px 24px; }
.canvas.preview-ink .canvas-word .cw-text {
  font-family: 'STKaiti', 'KaiTi', serif;
  letter-spacing: 3px;
  color: #1a1a1a;
}
.canvas.preview-modern { background: #ffffff; background-image: radial-gradient(rgba(0,0,0,0.02) 0.5px, transparent 0.5px); background-size: 24px 24px; }
.canvas.preview-modern .canvas-word .cw-text {
  font-family: 'PingFang SC', sans-serif;
  font-weight: 300;
  letter-spacing: 2px;
  color: #333;
}

/* ===== Help Overlay ===== */
.help-modal {
  background: var(--surface);
  width: 90%;
  max-width: 520px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0px 20px 60px rgba(47,46,44,0.2);
  overflow: hidden;
  border: 1px solid rgba(202,198,189,0.2);
}
.help-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
}
.help-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: #1a1918;
}
.help-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}
.help-section {
  margin-bottom: 24px;
}
.help-section:last-child { margin-bottom: 0; }
.help-section h3 {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--secondary);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.help-section p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-surface);
}
.help-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.help-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.help-step-num {
  width: 28px;
  height: 28px;
  background: #1a1918;
  color: white;
  font-family: var(--font-mono);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.help-step-content strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 2px;
  color: #1a1918;
}
.help-step-content p {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--on-surface-variant);
  line-height: 1.6;
}
.help-tips {
  list-style: none;
  padding: 0;
}
.help-tips li {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--on-surface);
  line-height: 1.7;
  padding: 5px 0 5px 18px;
  position: relative;
}
.help-tips li::before {
  content: '—';
  position: absolute;
  left: 2px;
  color: var(--secondary);
  font-family: var(--font-mono);
}
.help-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(202,198,189,0.2);
  text-align: center;
}

/* ===== Gallery Overlay ===== */
.gallery-modal {
  background: var(--surface);
  width: 90%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0px 20px 60px rgba(47,46,44,0.2);
  overflow: hidden;
  border: 1px solid rgba(202,198,189,0.2);
}
.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(202,198,189,0.3);
}
.gallery-header h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: #1a1918;
}
.gallery-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
}
.gallery-empty {
  text-align: center;
  padding: 60px 20px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--outline);
  line-height: 1.8;
}
.gallery-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  border: 1px solid rgba(202,198,189,0.3);
  margin-bottom: 12px;
  transition: all 0.2s;
  background: var(--surface-low);
  position: relative;
  cursor: pointer;
}
.gallery-item:hover {
  border-color: var(--outline-variant);
  box-shadow: 0px 4px 12px var(--shadow-warm);
}
.gallery-item-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  background: var(--surface-container);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  opacity: 0.5;
}
.gallery-item-info {
  flex: 1;
  min-width: 0;
}
.gallery-item-title {
  font-family: var(--font-display);
  font-size: 15px;
  color: #1a1918;
  margin-bottom: 2px;
}
.gallery-item-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--outline);
  letter-spacing: 0.03em;
}
.gallery-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}
.gallery-item-del {
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--error);
  border: 1px solid transparent;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.gallery-item-del:hover {
  border-color: var(--error);
  background: rgba(186,26,26,0.05);
}
.gallery-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(202,198,189,0.2);
  text-align: center;
}

/* Author input */
.toolbar-author {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.author-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--outline);
}
.author-input {
  width: 120px;
  padding: 4px 8px;
  border: 1px solid var(--outline-variant);
  background: rgba(255,255,255,0.7);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--on-surface);
  transition: border-color 0.2s;
}
.author-input:focus {
  outline: none;
  border-color: var(--secondary);
  background: white;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #screen-welcome { padding: 20px; }
  .welcome-card { padding: 40px 24px 32px; }
  .welcome-card h1 { font-size: 32px; line-height: 40px; }
  .age-options { flex-direction: column; }
  .text-grid { grid-template-columns: 1fr; }
  .level2-layout { flex-direction: column; height: auto; }
  .collection-panel { width: 100%; max-height: 200px; }
  .level3-layout { flex-direction: column; height: auto; }
  .wordbank-panel { width: 100%; max-height: 120px; flex-direction: row; flex-wrap: wrap; }
  .wordbank-body {
    max-height: 80px;
    padding-right: 8px;
    scrollbar-width: auto;
    scrollbar-color: #8f7554 rgba(188, 174, 150, 0.58);
  }
  .wordbank-body::-webkit-scrollbar {
    width: 10px;
  }
  .wordbank-body::-webkit-scrollbar-track {
    background: rgba(188, 174, 150, 0.52);
    border-radius: 999px;
  }
  .wordbank-body::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #b08d60 0%, #7d6446 100%);
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.35);
  }
  .wordbank-body::after {
    content: '';
    position: sticky;
    bottom: 0;
    display: block;
    width: 100%;
    height: 8px;
    background: linear-gradient(180deg, transparent 0%, rgba(241, 238, 230, 0.92) 100%);
    pointer-events: none;
  }
  .canvas-area { min-height: 400px; }
  .selection-bar { flex-direction: column; gap: 10px; }
  .selection-actions { width: 100%; }
  .selection-actions .btn { flex: 1; text-align: center; justify-content: center; }
  .canvas-toolbar { flex-direction: column; align-items: stretch; }
  .canvas-actions { justify-content: center; }
  .style-selector { flex-wrap: wrap; justify-content: center; }
  .level-indicator { display: none; }
}

@media (max-width: 480px) {
  #app { padding: 0; }
  .screen { padding: 12px; }
  #main-header { padding: 8px 12px; }
  .logo { font-size: 15px; }
}