/* Method frontend — claude.ai-inspired design system.
   Warm minimalist palette, elegant typography, soft shadows.
   Single file, no preprocessor. */

/* =========== Tokens =========== */
:root {
  /* Base — warm cream */
  --bg: #FAF9F5;
  --surface: #FFFFFF;
  --surface-alt: #F5F4EF;
  --border: #E8E5DC;
  --border-subtle: #F0EEE6;

  /* Text */
  --text: #141413;
  --text-secondary: #6B665C;
  --text-tertiary: #9A9489;

  /* Accent — warm tangerine */
  --accent: #C96442;
  --accent-hover: #B5583A;
  --accent-subtle: #F4E8E1;

  /* Status */
  --success: #4A8F5B;
  --success-subtle: #E3EFE5;
  --error: #B54040;
  --error-subtle: #F5E3E1;
  --warning: #C0872A;
  --warning-subtle: #F5EBD8;
  --info: #5C7A9C;
  --info-subtle: #E4EBF2;

  /* Code */
  --code-bg: #1F1E1C;
  --code-text: #E8E6E0;
  --code-inline-bg: #F0EEE6;

  /* Shadows — soft, warm */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);

  /* Layout */
  --max-width: 760px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
}

/* =========== Reset =========== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

code, pre, kbd, samp {
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-hover); }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}
h1 { font-size: 1.75rem; margin: 0 0 16px; }
h2 { font-size: 1.35rem; margin: 24px 0 12px; }
h3 { font-size: 1.15rem; margin: 20px 0 10px; }

p { margin: 0 0 12px; }

/* =========== Layout =========== */
main#content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 96px;
}

/* =========== Topbar =========== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 60px;
  padding: 0 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: saturate(150%) blur(6px);
}
.topbar .brand {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}
.topbar .brand:hover { color: var(--text); }
.topbar .email {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--text-secondary);
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.topbar .nav-history {
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}
.topbar .nav-history:hover {
  color: var(--text);
  background: var(--surface-alt);
}
.topbar .nav-logout {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 8px 14px;
  min-height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}
.topbar .nav-logout:hover {
  background: var(--surface-alt);
  color: var(--text);
}

/* =========== Forms — inputs & textarea =========== */
textarea, input[type="text"], input[type="email"] {
  width: 100%;
  font-family: inherit;
  font-size: 16px; /* ≥16px to prevent iOS zoom */
  line-height: 1.5;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
textarea {
  min-height: 120px;
  resize: vertical;
}
textarea:focus, input[type="text"]:focus, input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}
textarea::placeholder, input::placeholder { color: var(--text-tertiary); }

label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

/* =========== Buttons =========== */
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 10px 20px;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}
button:hover, .button:hover {
  background: var(--border-subtle);
  border-color: var(--border);
  text-decoration: none;
}
button:focus-visible, .button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-subtle);
  border-color: var(--accent);
}
button[disabled], .button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary — accent (claude.ai tangerine) */
button.primary, .button.primary {
  background: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  padding: 12px 24px;
}
button.primary:hover, .button.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #FFFFFF;
}

/* Ghost — no bg until hover */
button.ghost, .button.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}
button.ghost:hover, .button.ghost:hover {
  background: var(--surface-alt);
  color: var(--text);
  border-color: transparent;
}

/* =========== Login page =========== */
.login-wrap {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-md);
  text-align: center;
}
.login-card .brand {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  color: var(--text);
}
.login-card .tagline {
  color: var(--text-secondary);
  font-size: 15px;
  margin: 0 0 28px;
}
.login-card form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}
.login-card form label { margin-bottom: 2px; }
.login-card form button {
  width: 100%;
  margin-top: 4px;
}
.login-card .hint {
  margin: 18px 0 0;
  color: var(--text-tertiary);
  font-size: 13px;
}
.login-card h1 {
  font-size: 1.25rem;
  margin: 0 0 16px;
}

/* =========== Workspace (index) =========== */
.workspace { padding-top: 32px; }
.workspace h1 {
  text-align: center;
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 4vh 0 28px;
  color: var(--text);
}
.workspace form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mode-selector {
  border: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.mode-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
}
.mode-option input[type="radio"] {
  accent-color: var(--accent);
  cursor: pointer;
}
.mode-tag {
  font-style: normal;
  font-size: 11px;
  color: var(--warning);
  background: var(--warning-subtle);
  padding: 1px 6px;
  border-radius: 8px;
  margin-left: 2px;
  letter-spacing: 0.02em;
}
.visually-hidden {
  position: absolute !important;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background: var(--surface);
  color: var(--text-secondary);
  text-align: center;
  transition: all 0.15s ease;
}
.drop-zone .dz-desktop { color: var(--text-secondary); font-size: 15px; }
.drop-zone #pick-files {
  min-height: 36px;
  padding: 8px 16px;
  font-size: 14px;
  margin: 6px 0;
}
.drop-zone.over {
  border-color: var(--accent);
  background: var(--accent-subtle);
}
.drop-zone .hint {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--text-tertiary);
}

/* File chips */
.chips {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chips li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--surface-alt);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  font-size: 14px;
  color: var(--text);
}
.chips li button {
  min-width: auto;
  min-height: auto;
  padding: 0 4px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-size: 16px;
  line-height: 1;
  border-radius: 999px;
  cursor: pointer;
}
.chips li button:hover {
  background: var(--border-subtle);
  color: var(--text);
}

#submit-row {
  display: flex;
  justify-content: center;
  margin-top: 8px;
}
#submit-btn { min-width: 200px; }

/* =========== History list =========== */
.history-list h1 { margin-bottom: 20px; }
.cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cards > li { list-style: none; }

.card-row {
  position: relative;
}
.card-row .card { padding-right: 48px; }
.card-delete {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm, 6px);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}
.card-delete:hover,
.card-delete:focus-visible {
  color: var(--error);
  background: var(--error-subtle);
  outline: none;
}
.card-delete:active { transform: translateY(-50%) scale(0.95); }
.card-row.removing { opacity: 0; transition: opacity 0.2s ease; }

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text);
  text-decoration: none;
  transition: all 0.2s ease;
}
.card:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--text);
}
.card .question {
  font-weight: 500;
  font-size: 15px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card .meta {
  color: var(--text-tertiary);
  font-size: 13px;
}

/* Status dots & pills */
.status-dot {
  font-size: 10px;
  margin-right: 8px;
  vertical-align: middle;
}
.status-done { color: var(--success); }
.status-pending, .status-running { color: var(--warning); }
.status-failed { color: var(--error); }

.card .status-done { color: var(--success); }
.card .status-pending, .card .status-running { color: var(--warning); }
.card .status-failed { color: var(--error); }

.empty {
  color: var(--text-secondary);
  text-align: center;
  padding: 48px 16px;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

/* =========== History detail =========== */
.detail .back {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
}
.detail .back:hover { color: var(--text); }

.detail h2 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.detail blockquote.question {
  margin: 0 0 20px;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  white-space: pre-wrap;
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
}
.uploaded-files {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0 0 16px;
}

.status-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0 24px;
  flex-wrap: wrap;
}
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--surface-alt);
}
.status-indicator.status-done {
  color: var(--success);
  background: var(--success-subtle);
}
.status-indicator.status-pending,
.status-indicator.status-running {
  color: var(--warning);
  background: var(--warning-subtle);
  animation: pulse 2s ease-in-out infinite;
}
.status-indicator.status-failed {
  color: var(--error);
  background: var(--error-subtle);
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.65; }
}

.status-row button,
.status-row .button {
  min-height: 36px;
  padding: 8px 14px;
  font-size: 14px;
  background: transparent;
  border-color: var(--border);
  color: var(--text-secondary);
}
.status-row button:hover,
.status-row .button:hover {
  background: var(--surface-alt);
  color: var(--text);
}

.error-banner {
  padding: 14px 18px;
  border: 1px solid var(--error-subtle);
  background: var(--error-subtle);
  color: var(--error);
  border-radius: var(--radius-md);
  margin: 12px 0;
  font-size: 14px;
}

/* =========== Markdown rendering =========== */
.markdown {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  max-width: 72ch;
}
.markdown > *:first-child { margin-top: 0; }

.markdown h1, .markdown h2, .markdown h3, .markdown h4 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 1.8em 0 0.6em;
}
.markdown h1 { font-size: 1.6rem; }
.markdown h2 { font-size: 1.3rem; border-bottom: 1px solid var(--border-subtle); padding-bottom: 0.3em; }
.markdown h3 { font-size: 1.1rem; }
.markdown h4 { font-size: 1rem; color: var(--text-secondary); }

.markdown p { margin: 0 0 1em; }
.markdown ul, .markdown ol {
  margin: 0 0 1em;
  padding-left: 1.6em;
  line-height: 1.7;
}
.markdown li { margin: 0.3em 0; }
.markdown li > p { margin: 0 0 0.4em; }

.markdown pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.55;
  margin: 1em 0;
}
.markdown code {
  background: var(--code-inline-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--text);
}
.markdown pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
  border-radius: 0;
}

.markdown blockquote {
  margin: 1em 0;
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--border);
  color: var(--text-secondary);
  font-style: normal;
}

.markdown table {
  border-collapse: collapse;
  margin: 1em 0;
  width: 100%;
  font-size: 0.95em;
}
.markdown table th {
  text-align: left;
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 2px solid var(--accent);
  color: var(--text);
}
.markdown table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-subtle);
}
.markdown table tr:last-child td { border-bottom: none; }

.markdown hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

.markdown a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.markdown a:hover { color: var(--accent-hover); }

.markdown img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

/* =========== Misc utility =========== */
.noscript {
  padding: 14px 16px;
  background: var(--warning-subtle);
  border: 1px solid var(--warning-subtle);
  color: var(--warning);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

/* Centered status page (approved / approval_error) */
.status-page {
  max-width: 480px;
  margin: 10vh auto 0;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-md);
}
.status-page .icon {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 12px;
}
.status-page .icon.success { color: var(--success); }
.status-page .icon.error { color: var(--error); }
.status-page h1 {
  font-size: 1.35rem;
  margin: 0 0 8px;
}
.status-page p {
  color: var(--text-secondary);
  margin: 0 0 12px;
}

/* =========== Responsive ≤ 768px =========== */
@media (max-width: 768px) {
  main#content { padding: 20px 16px 96px; }
  .topbar { padding: 0 16px; gap: 10px; }
  .topbar .email {
    max-width: 140px;
    font-size: 13px;
  }
  .topbar .nav-history { padding: 8px 10px; }
  .topbar .nav-logout { padding: 8px 12px; }

  .workspace h1 {
    font-size: 24px;
    margin: 3vh 0 20px;
  }

  .card { padding: 16px 18px; }
  .login-card { padding: 32px 24px; }

  #submit-row {
    position: sticky;
    bottom: 0;
    padding: 12px 0 0;
    background: linear-gradient(180deg, transparent 0%, var(--bg) 30%);
  }
  #submit-btn { width: 100%; }

  .dz-desktop { display: none; }

  .markdown { font-size: 15px; }
  .markdown pre { font-size: 13px; padding: 12px; }
  .markdown table { display: block; overflow-x: auto; }

  h1 { font-size: 1.5rem; }
  .status-row { gap: 8px; }
  .status-row button, .status-row .button { flex: 1 1 auto; }
}

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