@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600&family=ZCOOL+QingKe+HuangYou&display=swap');

:root {
  --bg: #F9F8F4;
  --accent: #C0392B;
  --accent-light: #E8739A;
  --ink: #2C2416;
  --ink-light: #6B5B45;
  --ink-faint: #B8A990;
  --card-bg: #FFFFFF;
  --border: #E8E0D0;
  --spring-early: #F9D923;
  --spring-mid: #FFB7C5;
  --spring-late: #FF6B9D;
  --transition: 300ms ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  width: 100%;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  min-height: 100vh;
}

/* 纸质纹理 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* ===== PAGES ===== */
.page {
  display: none;
  min-height: 100vh;
  animation: fadeIn var(--transition);
}

.page.active {
  display: block;
}

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

/* ===== NAV ===== */
.nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(249, 248, 244, 0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: stretch;
  z-index: 100;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  color: var(--ink-faint);
  transition: color var(--transition);
  padding: 8px 0;
  border: none;
  background: none;
  font-family: inherit;
}

.nav-item.active {
  color: var(--accent);
}

.nav-icon {
  font-size: 22px;
  line-height: 1;
}

.nav-label {
  font-size: 10px;
  letter-spacing: 0.05em;
}

/* ===== HOME PAGE ===== */
#page-home {
  padding-bottom: 80px;
}

.hero-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 32px 40px;
  position: relative;
  overflow: hidden;
}

.hero-bg-text {
  position: absolute;
  font-size: 180px;
  color: rgba(192, 57, 43, 0.04);
  font-family: 'ZCOOL QingKe HuangYou', serif;
  user-select: none;
  pointer-events: none;
  line-height: 1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
}

.hero-logo {
  margin-bottom: 32px;
}

.hero-title {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--ink);
  text-align: center;
  margin-bottom: 12px;
  font-family: 'ZCOOL QingKe HuangYou', 'Noto Serif SC', serif;
}

.hero-subtitle {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.3em;
  text-align: center;
  margin-bottom: 48px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-direction: column;
  width: 100%;
  max-width: 280px;
}

.btn-primary {
  background: var(--accent);
  color: white;
  border: 1.5px solid var(--accent);
  padding: 16px 32px;
  font-size: 15px;
  letter-spacing: 0.2em;
  font-family: 'Noto Serif SC', serif;
  cursor: pointer;
  border-radius: 2px;
  transition: all var(--transition);
  text-align: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.15), 0 2px 8px rgba(192,57,43,0.2);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.08) 0%, transparent 50%);
  pointer-events: none;
}

.btn-primary:active {
  opacity: 0.85;
  transform: scale(0.98);
  box-shadow: 0 1px 2px rgba(192,57,43,0.2);
}

.btn-secondary {
  background: transparent;
  color: var(--ink-light);
  border: 1px solid var(--border);
  padding: 14px 32px;
  font-size: 14px;
  letter-spacing: 0.2em;
  font-family: 'Noto Serif SC', serif;
  cursor: pointer;
  border-radius: 2px;
  transition: all var(--transition);
  text-align: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6);
}

.btn-secondary:active {
  background: var(--border);
}

.home-intro {
  padding: 0 24px 32px;
}

.section-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.section-label {
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--ink-faint);
}

.period-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.period-tag {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  letter-spacing: 0.1em;
  border: 1px solid;
  cursor: pointer;
  transition: all var(--transition);
}

.period-tag.early {
  color: #8B6914;
  border-color: #F9D923;
  background: rgba(249, 217, 35, 0.1);
}

.period-tag.mid {
  color: #8B3060;
  border-color: #FFB7C5;
  background: rgba(255, 183, 197, 0.1);
}

.period-tag.late {
  color: #7B1547;
  border-color: #FF6B9D;
  background: rgba(255, 107, 157, 0.1);
}

.period-tag.active {
  opacity: 1;
}

.period-tag:not(.active) {
  opacity: 0.4;
}

.flower-preview-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.flower-preview-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px 12px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.flower-preview-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--flower-color, var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.flower-preview-card:active {
  transform: scale(0.97);
}

.flower-preview-card:active::before {
  opacity: 1;
}

.flower-preview-name {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--ink);
}

.flower-preview-period {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}

.flower-preview-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flower-color, var(--ink-faint));
  display: inline-block;
  margin-right: 4px;
  vertical-align: middle;
}

.flower-preview-locked {
  opacity: 0.4;
}

.flower-preview-unlocked .flower-preview-name {
  color: var(--accent);
}

/* ===== QUIZ PAGE ===== */
#page-quiz {
  padding-bottom: 80px;
}

.quiz-header {
  padding: 56px 24px 24px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.quiz-header-title {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--ink);
  margin-bottom: 6px;
}

.quiz-header-sub {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
}

.quiz-body {
  padding: 32px 24px;
}

.quiz-progress {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  justify-content: center;
}

.quiz-progress-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--transition);
}

.quiz-progress-dot.done {
  background: var(--accent);
}

.quiz-question-wrap {
  animation: slideUp 300ms ease;
}

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

.quiz-step-num {
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.3em;
  margin-bottom: 12px;
}

.quiz-question {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink);
  margin-bottom: 28px;
  letter-spacing: 0.05em;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px 18px;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  font-family: 'Noto Serif SC', serif;
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.5;
  letter-spacing: 0.03em;
  width: 100%;
}

.quiz-option:active {
  background: rgba(192, 57, 43, 0.06);
  border-color: var(--accent);
  color: var(--accent);
}

.quiz-option-icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border);
  font-size: 11px;
  text-align: center;
  line-height: 20px;
  margin-right: 10px;
  color: var(--ink-faint);
  flex-shrink: 0;
}

.quiz-option-content {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.quiz-back-btn {
  margin-top: 24px;
  background: none;
  border: none;
  color: var(--ink-faint);
  font-size: 13px;
  cursor: pointer;
  font-family: 'Noto Serif SC', serif;
  letter-spacing: 0.1em;
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ===== RESULT CARD ===== */
.result-card {
  animation: slideUp 300ms ease;
  padding: 0 24px 32px;
}

.result-flower-hero {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 32px 24px;
  margin-bottom: 16px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.result-flower-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--result-color, var(--accent));
}

.result-svg-wrap {
  margin: 0 auto 20px;
  width: 120px;
  height: 120px;
}

.result-name {
  font-size: 28px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.2em;
  margin-bottom: 8px;
  font-family: 'ZCOOL QingKe HuangYou', serif;
}

.result-period-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 11px;
  letter-spacing: 0.15em;
  border: 1px solid;
  margin-bottom: 20px;
}

.result-story {
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-light);
  text-align: left;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-checkin {
  background: var(--accent);
  color: white;
  border: none;
  padding: 16px;
  font-size: 15px;
  letter-spacing: 0.2em;
  font-family: 'Noto Serif SC', serif;
  cursor: pointer;
  border-radius: 2px;
  transition: all var(--transition);
  width: 100%;
}

.btn-checkin.checked {
  background: #6B5B45;
}

.btn-checkin:active {
  opacity: 0.85;
}

.btn-restart {
  background: transparent;
  color: var(--ink-light);
  border: 1px solid var(--border);
  padding: 14px;
  font-size: 14px;
  letter-spacing: 0.15em;
  font-family: 'Noto Serif SC', serif;
  cursor: pointer;
  border-radius: 2px;
  transition: all var(--transition);
  width: 100%;
}

/* ===== COLLECTION WALL ===== */
#page-collection {
  padding-bottom: 80px;
  background: var(--bg);
}

.collection-header {
  padding: 56px 20px 16px;
  border-bottom: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.collection-title {
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.25em;
  color: var(--ink);
  margin-bottom: 4px;
  font-family: 'Noto Serif SC', serif;
}

.collection-count {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.12em;
  font-family: 'Noto Serif SC', serif;
}

.collection-count span {
  color: var(--accent);
  font-weight: 500;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 16px 16px 8px;
  background: transparent;
  margin-top: 0;
}

/* 博物志标本卡 */
.specimen-cell {
  background: var(--card-bg);
  aspect-ratio: 3/4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  border: 1px solid #EEEEEE;
  box-shadow: 0 2px 8px rgba(60,40,10,0.07), 0 1px 2px rgba(60,40,10,0.05);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.specimen-cell:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(60,40,10,0.13), 0 2px 6px rgba(60,40,10,0.08);
}

.specimen-cell:active {
  transform: scale(0.97) translateY(0);
  box-shadow: 0 1px 3px rgba(60,40,10,0.08);
}

/* 未遇见：低饱和图片 + 轻微暗化 */
.specimen-cell:not(.unlocked) .specimen-photo {
  filter: grayscale(80%) brightness(0.88) contrast(0.9);
  opacity: 0.55;
}

/* 已遇见：彩色亮图 */
.specimen-cell.unlocked .specimen-photo {
  filter: none;
  opacity: 1;
}

/* 标本卡底部花名条 */
.specimen-name-bar {
  width: 100%;
  padding: 6px 0 7px;
  text-align: center;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(4px);
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

.specimen-name {
  font-size: 11px;
  color: var(--ink-light);
  letter-spacing: 0.12em;
  font-family: 'Noto Serif SC', serif;
  font-weight: 400;
}

.specimen-cell:not(.unlocked) .specimen-name {
  color: var(--ink-faint);
  opacity: 0.7;
}

/* 已遇见印章覆盖层 */
.specimen-cell.unlocked .stamp-overlay {
  position: absolute;
  bottom: 30px;
  right: 6px;
  z-index: 3;
  opacity: 0.82;
  pointer-events: none;
}

.specimen-svg-wrap {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes stampIn {
  0% { opacity: 0; transform: scale(1.4) rotate(-5deg); }
  60% { transform: scale(0.95) rotate(2deg); }
  100% { opacity: 1; transform: scale(1) rotate(0deg); }
}

/* ===== 3D 翻转过渡层 ===== */
#flip-overlay {
  position: fixed;
  inset: 0;
  z-index: 190;
  pointer-events: none;
  perspective: 900px;
  overflow: hidden;
}

.flip-card {
  position: absolute;
  transform-origin: center center;
  border-radius: 8px;
  overflow: hidden;
  backface-visibility: hidden;
  will-change: transform, opacity;
}

/* ===== 水墨晕染解锁效果 ===== */
.ink-wash-ripple {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  transform: scale(0);
  opacity: 0.72;
  animation: inkWash 900ms cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  z-index: 4;
}

@keyframes inkWash {
  0%   { transform: scale(0); opacity: 0.85; filter: blur(0px); }
  60%  { opacity: 0.55; filter: blur(2px); }
  100% { transform: scale(3.5); opacity: 0; filter: blur(8px); }
}

/* ===== MAGAZINE DETAIL MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(36, 28, 16, 0.55);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity 320ms ease;
  backdrop-filter: blur(12px) saturate(0.7);
  -webkit-backdrop-filter: blur(12px) saturate(0.7);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-sheet {
  background: var(--bg);
  width: 100%;
  border-radius: 20px 20px 0 0;
  padding: 0 0 env(safe-area-inset-bottom, 24px);
  transform: translateY(100%);
  transition: transform 380ms cubic-bezier(0.32, 0.72, 0, 1);
  max-height: 92vh;
  overflow-y: auto;
  overflow-x: hidden;
}

.modal-overlay.active .modal-sheet {
  transform: translateY(0);
}

.modal-handle {
  width: 36px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 12px auto 0;
}

/* 杂志页：顶部大图区 */
.modal-hero-band {
  position: relative;
  width: 100%;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: 0;
}

.modal-hero-bg {
  position: absolute;
  inset: 0;
  background: var(--modal-accent-bg, rgba(192,57,43,0.06));
}

.modal-hero-photo {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  position: relative;
  z-index: 1;
  transition: filter 600ms ease;
}

.modal-hero-photo--locked {
  filter: grayscale(100%) brightness(0.85);
}

.modal-hero-photo-placeholder {
  position: relative;
  z-index: 1;
  padding: 24px 0 12px;
}

/* 花名 Hero 悬浮层 */
.modal-title-band {
  position: relative;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.modal-flower-name {
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink);
  font-family: 'ZCOOL QingKe HuangYou', serif;
  line-height: 1;
}

.modal-hero-flag {
  font-size: 9px;
  letter-spacing: 0.3em;
  color: white;
  background: var(--accent);
  padding: 3px 8px;
  border-radius: 1px;
  white-space: nowrap;
  margin-bottom: 4px;
}

.modal-alias {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.15em;
  margin-top: 5px;
}

.modal-period-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 11px;
  letter-spacing: 0.15em;
  border: 1px solid;
  margin-top: 8px;
}

/* 杂志内容区 */
.modal-content-body {
  padding: 0 24px 32px;
}

.modal-section {
  padding: 20px 0;
  border-bottom: 1px solid rgba(184,169,144,0.25);
}

.modal-section:last-child {
  border-bottom: none;
}

.modal-section-label {
  font-size: 9px;
  letter-spacing: 0.5em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(192,57,43,0.2);
}

.modal-story {
  font-size: 15px;
  line-height: 2;
  color: var(--ink-light);
  font-style: italic;
  letter-spacing: 0.04em;
}

.modal-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.modal-info-item {
  background: rgba(184,169,144,0.1);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
}

.modal-info-label {
  font-size: 9px;
  letter-spacing: 0.35em;
  color: var(--ink-faint);
  margin-bottom: 5px;
}

.modal-info-value {
  font-size: 12px;
  color: var(--ink-light);
  line-height: 1.6;
  letter-spacing: 0.03em;
}

.modal-info-full {
  background: rgba(184,169,144,0.1);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 14px 16px;
  margin-top: 10px;
}

.modal-literature-text {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.9;
  border-left: 2px solid var(--accent);
  padding-left: 14px;
  letter-spacing: 0.04em;
}

.modal-section--distinction {
  background: rgba(46,109,164,0.04);
  border-radius: 4px;
  margin-left: -4px;
  margin-right: -4px;
  padding: 0 4px;
}

.modal-distinction-text {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.9;
  border-left: 2px solid #2E6DA4;
  padding-left: 14px;
  letter-spacing: 0.04em;
}

.modal-checkin-row {
  padding: 16px 24px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* 已打卡状态行 */
.modal-stamp-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(192,57,43,0.04);
  border: 1px solid rgba(192,57,43,0.15);
  border-radius: 4px;
  margin: 0 24px;
}

/* ===== HERO SVG (垂丝海棠 line art) ===== */
.hero-svg {
  filter: drop-shadow(0 2px 8px rgba(192, 57, 43, 0.15));
}

/* ===== STAMP ===== */
.stamp-circle {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-dasharray: 4 2;
  opacity: 0.75;
}

.stamp-text {
  fill: var(--accent);
  font-family: 'Noto Serif SC', serif;
  font-size: 8px;
  opacity: 0.75;
}

/* 标本格子：印章右下角定位 */
.specimen-cell {
  position: relative;
}

.stamp-overlay {
  position: absolute;
  bottom: 4px;
  right: 4px;
  top: auto;
  left: auto;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  opacity: 0;
  transition: opacity var(--transition);
  width: 36px;
  height: 36px;
}

.specimen-cell.unlocked .stamp-overlay {
  opacity: 1;
  animation: stampIn 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== PHOTO FRAME in specimen ===== */
.specimen-photo {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 2px;
  display: block;
  filter: grayscale(100%) opacity(0.55);
  transition: filter 500ms ease;
}

.specimen-cell.unlocked .specimen-photo {
  filter: grayscale(0%) opacity(1);
}

/* ===== PERIOD FILTER BAR ===== */
.filter-bar {
  display: flex;
  gap: 0;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  flex: 1;
  padding: 8px 4px;
  border: none;
  background: none;
  font-family: 'Noto Serif SC', serif;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.filter-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 0;
}

/* ===== UTILITIES ===== */
.text-accent { color: var(--accent); }
.text-faint { color: var(--ink-faint); }

.fade-in {
  animation: fadeIn var(--transition);
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: opacity 600ms ease;
}

.loading-screen.hide {
  opacity: 0;
  pointer-events: none;
}

.loading-title {
  font-size: 24px;
  letter-spacing: 0.3em;
  color: var(--ink);
  margin-top: 24px;
  font-family: 'ZCOOL QingKe HuangYou', serif;
}

.loading-sub {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.4em;
  margin-top: 8px;
}

/* ===== EMPTY STATE ===== */
.empty-hint {
  text-align: center;
  padding: 48px 24px;
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: 0.1em;
  line-height: 2;
}

/* ===== ACHIEVEMENT BOOKMARK ===== */
.achievement-toast {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%) translateY(-100%);
  z-index: 999;
  background: linear-gradient(160deg, #fffdf4 0%, #fdf5d8 100%);
  border: 1px solid #D4AA20;
  border-top: none;
  border-radius: 0 0 12px 12px;
  padding: 20px 20px 16px;
  width: 260px;
  box-shadow: 0 8px 32px rgba(44,36,22,0.22), 0 2px 8px rgba(212,170,20,0.18);
  transition: transform 480ms cubic-bezier(0.34, 1.26, 0.64, 1);
  cursor: pointer;
}

/* 书签底部锯齿装饰 */
.achievement-toast::after {
  content: '';
  display: block;
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 8px;
  background:
    radial-gradient(circle at 8px 0, transparent 8px, #D4AA20 8px, #D4AA20 9px, transparent 9px),
    radial-gradient(circle at 8px 0, transparent 7px, #fffdf4 7px);
  background-size: 16px 8px;
  background-repeat: repeat-x;
}

.achievement-toast.show {
  transform: translateX(-50%) translateY(0);
}

/* 书签顶部金线 */
.achievement-toast::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, #D4AA20, #F0D060, #D4AA20);
  margin: -20px -20px 14px;
  border-radius: 0;
}

.ach-toast-icon {
  font-size: 28px;
  text-align: center;
  margin-bottom: 8px;
  filter: drop-shadow(0 2px 4px rgba(212,170,20,0.3));
}

.ach-toast-body {
  text-align: center;
}

.ach-toast-tag {
  font-size: 8px;
  letter-spacing: 0.45em;
  color: #D4AA20;
  margin-bottom: 5px;
  font-family: 'Noto Serif SC', serif;
}

.ach-toast-title {
  font-size: 16px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.18em;
  font-family: 'Noto Serif SC', serif;
  margin-bottom: 6px;
}

.ach-toast-desc {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  line-height: 1.7;
}

.ach-toast-hint {
  font-size: 9px;
  color: #D4AA20;
  margin-top: 10px;
  letter-spacing: 0.2em;
  opacity: 0.7;
}

/* ===== PETAL PARTICLES ===== */
.petal-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 600ms ease;
}

.petal-canvas.active {
  opacity: 1;
}

/* ===== ACHIEVEMENT PANEL ===== */
.ach-panel-header {
  padding: 28px 24px 20px;
  border-bottom: 0.5px solid var(--border);
}

.ach-panel-title {
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--ink);
  font-family: 'Noto Serif SC', serif;
  margin-bottom: 6px;
}

.ach-panel-sub {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  font-family: 'Noto Serif SC', serif;
}

.ach-list {
  padding: 4px 0;
}

.ach-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 0.5px solid rgba(184,169,144,0.15);
  transition: background var(--transition);
}

.ach-row:last-child {
  border-bottom: none;
}

.ach-row.locked {
  opacity: 0.5;
}

/* 汉字徽章（替代emoji） */
.ach-badge {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border: 0.5px solid;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-family: 'Noto Serif SC', serif;
  font-weight: 400;
  letter-spacing: 0;
  background: transparent;
}

.ach-row.locked .ach-badge {
  border-color: #DEDAD6 !important;
  color: #DEDAD6 !important;
}

.ach-info {
  flex: 1;
  min-width: 0;
}

.ach-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.ach-title {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.12em;
  font-family: 'Noto Serif SC', serif;
}

.ach-rarity-tag {
  font-size: 8px;
  letter-spacing: 0.3em;
  padding: 1px 6px;
  border-radius: 2px;
  border: 0.5px solid;
  white-space: nowrap;
  font-family: 'Noto Serif SC', serif;
}

.ach-desc {
  font-size: 11px;
  color: var(--ink-faint);
  line-height: 1.7;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.ach-progress-bar {
  height: 1px;
  background: var(--border);
  border-radius: 1px;
  overflow: hidden;
  margin-top: 6px;
}

.ach-progress-fill {
  height: 100%;
  border-radius: 1px;
  transition: width 800ms ease;
  opacity: 0.6;
}

/* ===== PPBC CREDIT ===== */
.ppbc-credit {
  padding: 20px 24px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.ppbc-credit-text {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.ppbc-credit-text a {
  color: var(--ink-light);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}

.ppbc-credit-text a:active {
  opacity: 0.7;
}

.ppbc-credit-authors {
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  opacity: 0.7;
}

.ppbc-credit-maker {
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: 0.12em;
  margin-top: 8px;
  opacity: 0.55;
}

/* ===== ACHIEVEMENT ENTRY in collection header ===== */
.ach-entry-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  font-size: 11px;
  color: var(--ink-light);
  letter-spacing: 0.15em;
  font-family: 'Noto Serif SC', serif;
  cursor: pointer;
  transition: all var(--transition);
}

.ach-entry-btn:active {
  background: var(--border);
}