*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background-color: #ffffff;
  color: #111111;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

.auth-wrap,
.upload-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

.upload-wrap {
  min-height: calc(100vh - 57px);
}

.auth-card {
  width: 100%;
  max-width: 380px;
  padding: 28px;
}

.upload-card {
  width: 100%;
  max-width: 520px;
  padding: 28px;
}

.upload-card h2 {
  margin: 0 0 4px 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.muted {
  margin: 0 0 18px 0;
  color: #6b7280;
  font-size: 0.9rem;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.brand-row h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-mark {
  font-size: 1.2rem;
  line-height: 1;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: #111111;
}

.input {
  width: 100%;
  padding: 10px 12px;
  font-size: 0.95rem;
  color: #111111;
  background-color: #fafafa;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.input:focus {
  background-color: #ffffff;
  border-color: #111111;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

.btn-primary {
  background-color: #111111;
  color: #ffffff;
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-secondary {
  background-color: #fafafa;
  color: #111111;
  border-color: #d1d5db;
}

.btn-secondary:hover {
  background-color: #f3f4f6;
}

.btn-ghost {
  background-color: transparent;
  color: #374151;
  border-color: #e5e7eb;
}

.btn-ghost:hover {
  background-color: #fafafa;
  color: #111111;
}

.btn-full {
  width: 100%;
}

.alert-error {
  margin-bottom: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background-color: #fee2e2;
  color: #991b1b;
  font-size: 0.875rem;
  font-weight: 500;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

.topbar-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #111111;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  flex-shrink: 0;
}

.file-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background-color: #f3f4f6;
  color: #374151;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 36px 20px;
  border: 1.5px dashed #d1d5db;
  border-radius: 10px;
  background-color: #fafafa;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone:hover,
.dropzone.is-dragover {
  border-color: #111111;
  background-color: #f3f4f6;
}

.dropzone input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

.dropzone-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: #111111;
}

.dropzone-sub {
  font-size: 0.825rem;
  color: #6b7280;
}

.file-selected {
  font-size: 0.85rem;
  font-weight: 500;
  color: #111111;
  min-height: 1.2em;
}

.reader-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 64px 20px;
}

.markdown-body {
  padding: 36px 42px;
  overflow-wrap: break-word;
}

.markdown-body > *:first-child {
  margin-top: 0;
}

.markdown-body > *:last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: 1.5em;
  margin-bottom: 0.6em;
  font-weight: 600;
  line-height: 1.3;
  color: #111111;
  scroll-margin-top: 76px;
}

.markdown-body h1 {
  font-size: 1.85rem;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #e5e7eb;
}

.markdown-body h2 {
  font-size: 1.45rem;
  padding-bottom: 0.25em;
  border-bottom: 1px solid #e5e7eb;
}

.markdown-body h3 {
  font-size: 1.2rem;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body pre,
.markdown-body table {
  margin-top: 0;
  margin-bottom: 1rem;
}

.markdown-body a {
  color: #111111;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background-color: #f3f4f6;
  border-radius: 5px;
}

.markdown-body pre {
  padding: 14px 16px;
  overflow-x: auto;
  background-color: #fafafa;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  line-height: 1.5;
}

.markdown-body pre code {
  padding: 0;
  background-color: transparent;
  border-radius: 0;
  font-size: 0.85rem;
}

.markdown-body blockquote {
  margin-left: 0;
  padding: 4px 0 4px 16px;
  border-left: 3px solid #d1d5db;
  color: #4b5563;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.6rem;
}

.markdown-body li + li {
  margin-top: 0.25rem;
}

.markdown-body li.task-item {
  list-style: none;
  margin-left: -1.3rem;
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid #e5e7eb;
  margin: 1.75rem 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
}

.markdown-body th,
.markdown-body td {
  padding: 8px 12px;
  border: 1px solid #e5e7eb;
  text-align: left;
}

.markdown-body th {
  background-color: #fafafa;
  font-weight: 600;
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}

.code-wrap {
  position: relative;
  margin-bottom: 1rem;
}

.code-wrap pre {
  margin-bottom: 0;
  padding-right: 76px;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-family: inherit;
  font-weight: 500;
  color: #374151;
  background-color: #ffffff;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity 0.15s ease, border-color 0.15s ease;
}

.copy-btn:hover {
  opacity: 1;
  border-color: #111111;
  color: #111111;
}

.mermaid {
  margin: 1.25rem 0;
  padding: 16px;
  background-color: #fafafa;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  text-align: center;
  overflow-x: auto;
}

.mermaid svg {
  max-width: 100%;
  height: auto;
}

.markdown-alert {
  padding: 12px 16px;
  margin-bottom: 1rem;
  border-left: 3px solid #111111;
  background-color: #fafafa;
  border-radius: 0 8px 8px 0;
}

.markdown-alert > *:last-child {
  margin-bottom: 0;
}

.markdown-alert-title {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.markdown-alert-note {
  border-left-color: #2563eb;
}

.markdown-alert-note .markdown-alert-title {
  color: #1d4ed8;
}

.markdown-alert-tip {
  border-left-color: #16a34a;
}

.markdown-alert-tip .markdown-alert-title {
  color: #15803d;
}

.markdown-alert-important {
  border-left-color: #111111;
}

.markdown-alert-important .markdown-alert-title {
  color: #111111;
}

.markdown-alert-warning {
  border-left-color: #d97706;
}

.markdown-alert-warning .markdown-alert-title {
  color: #b45309;
}

.markdown-alert-caution {
  border-left-color: #dc2626;
}

.markdown-alert-caution .markdown-alert-title {
  color: #b91c1c;
}

.footnotes {
  margin-top: 2rem;
  font-size: 0.875rem;
  color: #4b5563;
}

.footnotes li {
  scroll-margin-top: 76px;
}

.footnote-ref a,
.footnote-backref {
  text-decoration: none;
  padding: 0 2px;
}

@media (max-width: 768px) {
  .topbar-inner {
    padding: 10px 14px;
  }

  .file-badge {
    max-width: 140px;
  }

  .reader-wrap {
    padding: 16px 12px 40px 12px;
  }

  .markdown-body {
    padding: 20px 18px;
  }
}

@media print {
  .topbar,
  .copy-btn {
    display: none;
  }

  .reader-wrap {
    max-width: none;
    padding: 0;
  }

  .markdown-body {
    border: 0;
    padding: 0;
  }
}