:root {
  --bg: #FAF9F7;
  --surface: #FFFFFF;
  --surface-elevated: #FFFFFF;
  --ink: #2C2A26;
  --ink-secondary: #6B6864;
  --ink-tertiary: #9A9894;
  --border: #E8E5E0;
  --border-strong: #D9D5CE;
  --hover: #F2F0EC;
  --accent: #7C8B7A;
  --accent-hover: #6B7A69;
  --accent-soft: #EEF2EC;
  --danger: #B87A7A;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(44, 42, 38, 0.04);
  --shadow-md: 0 4px 20px rgba(44, 42, 38, 0.06);
  --shadow-lg: 0 12px 40px rgba(44, 42, 38, 0.1);
  --transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif SC', Georgia, 'Times New Roman', serif;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 247, 0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: inset 0 0 0 4px var(--accent-soft);
}

.main-nav {
  display: flex;
  gap: 6px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--ink-secondary);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--ink);
  background: var(--hover);
}

.nav-link.active {
  color: var(--ink);
  background: var(--hover);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.auth-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 100px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  color: #fff;
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  font-weight: 500;
  line-height: 1.4;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.btn-secondary {
  background: var(--accent-soft);
  color: var(--accent-hover);
  border-color: var(--accent-soft);
}

.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
}

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--ink-secondary);
  background: var(--surface);
}

.btn-ghost:hover {
  border-color: var(--ink-tertiary);
  color: var(--ink);
}

.btn-small {
  padding: 7px 14px;
  font-size: 0.9rem;
}

.btn-text {
  padding: 6px 10px;
  font-size: 0.9rem;
  color: var(--ink-secondary);
}

.btn-text:hover {
  color: var(--ink);
  background: var(--hover);
}

.btn-back {
  margin-bottom: 16px;
  padding-left: 0;
  border: none;
  background: transparent;
}

.main {
  min-height: calc(100vh - 64px - 120px);
  padding: 32px 0 64px;
}

.view {
  animation: fadeIn 260ms ease;
}

.hero {
  text-align: center;
  padding: 40px 0 36px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 14px;
  color: var(--ink);
}

.hero-subtitle {
  max-width: 560px;
  margin: 0 auto 28px;
  color: var(--ink-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
}

.mood-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.chip {
  padding: 7px 16px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.chip:hover {
  border-color: var(--border-strong);
  color: var(--ink);
}

.chip-active {
  background: var(--ink);
  color: var(--surface);
  border-color: var(--ink);
}

.posts-feed {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px 18px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.post-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.post-author {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

.post-author-name {
  font-weight: 500;
  color: var(--ink);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--ink-tertiary);
}

.mood-pill {
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-size: 0.78rem;
  font-weight: 500;
}

.post-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 10px;
}

.post-excerpt {
  color: var(--ink-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
  margin: 0 0 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: none;
  background: transparent;
  color: var(--ink-tertiary);
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.action-btn:hover {
  color: var(--ink);
  background: var(--hover);
}

.action-btn.liked {
  color: var(--danger);
}

.post-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.post-detail .post-title {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.post-detail .post-content {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--ink);
  white-space: pre-wrap;
  margin-bottom: 24px;
}

.ai-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.reply-composer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
}

.composer-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 12px;
}

.textarea, .input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  resize: vertical;
}

.textarea:focus, .input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

.replies-tree {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.reply-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.reply-ai {
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--surface) 0%, var(--accent-soft) 100%);
}

.reply-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.reply-author {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
}

.ai-badge {
  padding: 2px 8px;
  border-radius: 100px;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
}

.reply-content {
  color: var(--ink);
  line-height: 1.8;
  margin: 0 0 12px;
  white-space: pre-wrap;
}

.reply-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reply-children {
  margin-top: 14px;
  padding-left: 18px;
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nested-composer {
  margin-top: 12px;
  padding: 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.profile-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin-bottom: 32px;
}

.profile-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  font-size: 1.8rem;
  color: #fff;
  font-family: var(--font-serif);
}

.profile-name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin: 0 0 6px;
}

.profile-meta {
  color: var(--ink-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin: 0 0 18px;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--ink-tertiary);
}

.empty-state-title {
  color: var(--ink-secondary);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--surface);
  border: none;
  font-size: 1.8rem;
  font-weight: 300;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition), background var(--transition);
  z-index: 90;
}

.fab:hover {
  transform: scale(1.05);
  background: var(--accent);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(44, 42, 38, 0.24);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  width: 100%;
  max-width: 560px;
  max-height: 86vh;
  overflow: auto;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transform: translateY(16px) scale(0.98);
  transition: transform var(--transition);
}

.modal-overlay.show .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin: 0;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--hover);
  color: var(--ink-secondary);
  font-size: 1.4rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.modal-close:hover {
  background: var(--border);
  color: var(--ink);
}

.modal-body {
  padding: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

.form-hint {
  font-size: 0.82rem;
  color: var(--ink-tertiary);
  margin-top: 6px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 22px;
}

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

.mood-option {
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.mood-option:hover {
  border-color: var(--border-strong);
}

.mood-option.selected {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-hover);
}

.toast-container {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 300;
  pointer-events: none;
}

.toast {
  background: var(--ink);
  color: var(--surface);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-size: 0.95rem;
  animation: slideDown 220ms ease;
  pointer-events: auto;
}

.toast.error {
  background: var(--danger);
}

.loader {
  width: 28px;
  height: 28px;
  margin: 24px auto;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--ink-tertiary);
}

.footer-copy {
  font-family: var(--font-serif);
  margin: 0 0 6px;
  color: var(--ink-secondary);
}

.footer-hint {
  margin: 0;
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .header-inner {
    height: 56px;
  }

  .main-nav {
    display: none;
  }

  .hero {
    padding: 28px 0;
  }

  .post-card, .post-detail, .reply-composer, .reply-item, .profile-card {
    padding: 18px;
  }

  .fab {
    right: 16px;
    bottom: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.ai-reply-pinned {
  margin-bottom: 24px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.ai-reply-pinned .composer-title {
  font-size: 0.95rem;
  color: var(--accent-hover);
  margin-bottom: 10px;
}

.anonymous-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.anonymous-toggle {
  font-weight: 500;
  color: var(--ink-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.anonymous-toggle:hover {
  background: var(--hover);
}

.anonymous-posts {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.ai-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ai-actions .ai-style-select,
.ai-actions .btn {
  height: 38px;
  padding: 0 14px;
  font-size: 0.9rem;
  line-height: 38px;
  border-radius: var(--radius-md);
}

.ai-actions .ai-style-select {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  min-width: 140px;
}

.category-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  justify-content: center;
}

.category-tab {
  padding: 8px 20px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

.category-tab:hover {
  background: var(--hover);
}

.category-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.category-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.category-badge.category-treehole {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.category-badge.category-thought {
  background: #F2ECF4;
  color: #7A6B8B;
}

.category-select {
  display: flex;
  gap: 10px;
}

.category-option {
  flex: 1;
  padding: 10px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.category-option.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.composer-meta {
  display: flex;
  justify-content: flex-end;
  margin-top: 6px;
}

.char-count {
  font-size: 0.8rem;
  color: var(--ink-tertiary);
}

.reply-auth-hint {
  padding: 24px;
  text-align: center;
  background: var(--hover);
  border-radius: var(--radius-md);
  color: var(--ink-secondary);
}

.reply-auth-hint p {
  margin: 0 0 12px;
}

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 90px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-secondary);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  z-index: 50;
  transition: var(--transition);
}

.scroll-top:hover {
  background: var(--hover);
  color: var(--ink);
}

@media (max-width: 640px) {
  .main-nav {
    display: flex;
    gap: 12px;
  }

  .main-nav .nav-link {
    padding: 6px 10px;
    font-size: 0.9rem;
  }

  .category-tabs {
    gap: 6px;
  }

  .category-tab {
    padding: 7px 16px;
    font-size: 0.9rem;
  }

  .ai-actions .ai-style-select,
  .ai-actions .btn {
    width: 100%;
    flex: 1;
  }
}

.load-more {
  display: flex;
  justify-content: center;
  padding: 12px 0 24px;
}

.avatar-link {
  display: inline-flex;
  text-decoration: none;
  cursor: pointer;
}

.avatar-link:hover .avatar {
  transform: scale(1.05);
}

.user-menu {
  position: relative;
}

.user-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 5px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
}

.user-pill:hover {
  background: var(--hover);
}

.user-pill .caret {
  font-size: 0.75rem;
  color: var(--ink-tertiary);
}

.user-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 140px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 6px;
  z-index: 100;
}

.dropdown-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.9rem;
}

.dropdown-item:hover {
  background: var(--hover);
}

.dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

.settings-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 520px;
}

.btn-publish {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.icon-paper-plane {
  width: 16px;
  height: 16px;
}

.mood-pill,
.category-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
}

.action-btn-delete {
  margin-left: auto;
  color: var(--ink-tertiary);
}

.action-btn-delete:hover {
  color: #C25E5E;
}

.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.confirm-overlay.show {
  opacity: 1;
}

.confirm-dialog {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 360px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.confirm-title {
  margin: 0 0 12px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
}

.confirm-message {
  margin: 0 0 24px;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.confirm-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}