:root {
  color-scheme: light;
  --bg-page: #f5f6fb;
  --panel-bg: #e6e9f4;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text-primary: #101828;
  --text-secondary: #4b5563;
  --accent: #f43f5e;
  --accent-strong: #ef233c;
  --muted: #9ca3af;
  --code-bg: #0f172a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system,
    BlinkMacSystemFont, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 16px;
}

.site-header {
  padding: 32px 56px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid rgba(16, 24, 40, 0.08);
  background: var(--surface);
}

.site-header h1 {
  margin: 4px 0;
  font-size: 2rem;
}

.brand-badge {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  border-radius: 14px;
  background: #101828;
  color: #fff;
  box-shadow: 0 12px 30px rgba(16, 24, 40, 0.2);
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.brand-sub {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 0.05em;
}

.auth-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  backdrop-filter: blur(8px);
}

.auth-overlay.is-hidden {
  display: none;
}

.auth-dialog {
  width: min(360px, 90vw);
  padding: 32px;
  border-radius: 24px;
  background: #0f172a;
  color: #fff;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-dialog h2 {
  margin: 0;
  font-size: 1.4rem;
  letter-spacing: 0.08em;
}

.auth-dialog p {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

.auth-dialog input {
  border: none;
  border-radius: 12px;
  padding: 12px;
  font-size: 1rem;
  outline: none;
}

.auth-error {
  color: #fda4af;
  min-height: 20px;
}

.site-header p {
  margin: 0;
  color: var(--text-secondary);
}

.workspace {
  width: min(1680px, 95vw);
  margin: 0 auto;
  padding: 32px 56px 56px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.ghost-btn {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid rgba(244, 63, 94, 0.4);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease;
}

.ghost-btn:hover {
  background: rgba(244, 63, 94, 0.08);
}

.field-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
}

.hint.accent {
  color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(420px, 1fr) minmax(500px, 1.2fr);
  gap: 32px;
  align-items: stretch;
}

.column-card {
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.composer textarea {
  border: none;
  resize: none;
  min-height: 65vh;
  background: transparent;
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
  outline: none;
}

.preview-column {
  gap: 14px;
}

.ai-panel {
  margin: 16px 0 20px;
  padding: 18px;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.02);
  border: 1px solid rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ai-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

.eyebrow {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin: 0 0 4px;
}

.ai-panel__header h2 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.ai-panel__header .tip {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex: 1;
}

.input-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.input-label .mute {
  font-size: 0.72rem;
  color: var(--muted);
  margin-left: 6px;
}

.input-label input,
.input-label textarea {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  background: var(--surface);
  color: var(--text-primary);
  transition: border 0.2s ease;
}

.input-label input:focus,
.input-label textarea:focus {
  border-color: var(--accent);
}

.ai-config {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.raw-input {
  min-height: 160px;
  resize: vertical;
}

.accent-btn {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.accent-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.mode-switch {
  display: flex;
  gap: 12px;
  background: rgba(15, 23, 42, 0.04);
  padding: 8px;
  border-radius: 999px;
  flex-wrap: wrap;
}

.mode-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.mode-option input {
  accent-color: var(--accent);
}

.mode-note {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.input-label.is-disabled {
  opacity: 0.5;
}

.ai-status {
  min-height: 20px;
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin: 0;
}

#markdownInput {
  width: 100%;
  min-height: 60vh;
  border: none;
  padding: 0;
  font-size: 0.95rem;
  resize: none;
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  outline: none;
  background: transparent;
  color: var(--text-primary);
}

#markdownInput:focus {
  border: none;
  box-shadow: none;
}

.preview-surface {
  min-height: 420px;
  background: var(--surface);
  border-radius: 24px;
  border: 1px solid var(--border);
  padding: 32px 40px;
  overflow-y: auto;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.08);
}

.article {
  max-width: 640px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

.article h1,
.article h2,
.article h3,
.article h4 {
  color: var(--text-primary);
  margin-top: 2.4em;
  margin-bottom: 0.6em;
  line-height: 1.3;
}

.article h1 {
  font-size: 2.4rem;
  letter-spacing: 0.01em;
  font-weight: 700;
}

.article h2 {
  font-size: 1.25rem;
  border-left: 6px solid var(--accent);
  padding-left: 12px;
  font-weight: 700;
}

.article h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  text-transform: none;
  padding-left: 10px;
  border-left: 4px solid rgba(244, 63, 94, 0.7);
}

.article h4 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text-primary);
}

.article p {
  margin: 1em 0;
  font-size: 1rem;
}
.article strong {
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--accent-strong);
}

.article strong[data-tone="dark"] {
  color: var(--text-primary);
}

.article strong[data-tone="red"] {
  color: var(--accent-strong);
}

.article b {
  font-weight: 700;
  color: var(--text-primary);
}

.article blockquote {
  margin: 1.4em 0;
  padding: 1em 1.4em;
  border-left: 4px solid var(--accent);
  background: rgba(244, 63, 94, 0.05);
  border-radius: 0 12px 12px 0;
  color: var(--text-primary);
}

.article ul,
.article ol {
  margin: 1.2em 0 1.2em 1.4em;
  padding: 0;
}

.article li + li {
  margin-top: 0.4em;
}

.article code {
  font-family: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  background: rgba(16, 24, 40, 0.08);
  padding: 0.18em 0.4em;
  border-radius: 6px;
  color: var(--text-primary);
}

.article pre {
  margin: 1.6em 0;
  padding: 16px 20px;
  background: var(--code-bg);
  color: #e5e7eb;
  border-radius: 14px;
  overflow-x: auto;
}

.article pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

.article .placeholder {
  text-align: center;
  color: var(--muted);
  font-style: italic;
  margin-top: 2em;
}

@media (max-width: 1024px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  .workspace {
    padding: 24px;
  }

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

  #markdownInput,
  .preview-surface {
    height: auto;
    min-height: 320px;
  }
}