:root {
  --navy: #1F3A5F;
  --navy-deep: #152a45;
  --amber: #D97706;
  --cream: #FBFAF5;
  --ink: #1a2332;
  --muted: #5c6b7a;
  --line: #d9dee5;
  --ok: #0f7a4a;
  --err: #b42318;
  --card: #ffffff;
  --sidebar: #152a45;
  --font-sans: "Source Sans 3", system-ui, sans-serif;
  --font-serif: "Libre Baskerville", Georgia, serif;

  --bg-app: var(--cream);
  --bg-card: var(--card);
  --text-primary: var(--ink);
  --text-secondary: var(--muted);
  --text-muted: var(--muted);
  --border-color: var(--line);
  --primary: var(--navy);
  --primary-hover: var(--navy-deep);
  --primary-light: #e8eef5;
  --success: var(--ok);
  --success-light: #edf8f1;
  --warning: var(--amber);
  --warning-light: #f5f1e8;
  --danger: var(--err);
  --danger-light: #fdf2f0;
  --border-radius-sm: 0;
  --border-radius-md: 0;
  --border-radius-lg: 0;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .brand-mark, .page-title, .stat-value {
  font-family: var(--font-serif);
  font-weight: 700;
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--amber); }

.app-shell,
.app-container {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

.sidebar,
.app-sidebar {
  background: var(--sidebar);
  color: #d7dee8;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0;
}

.sidebar-brand,
.brand-section {
  padding: 0 1.25rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
  display: block;
  width: 160px;
  height: auto;
  max-width: 160px;
  max-height: 48px;
  margin-bottom: 0.65rem;
  object-fit: contain;
}

.sidebar-brand strong,
.brand-name {
  display: block;
  font-family: var(--font-serif);
  color: #fff;
  font-size: 1.15rem;
}

.sidebar-brand span {
  font-size: 0.85rem;
  color: #9aabbd;
}

.sidebar nav,
.nav-menu {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0.75rem 1rem;
  gap: 0.15rem;
  flex: 1;
  list-style: none;
  margin: 0;
}

.sidebar nav .nav-group {
  margin: 0.85rem 0.75rem 0.25rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7a8ea3;
}
.sidebar nav .nav-group:first-child { margin-top: 0.25rem; }

.sidebar nav a,
.nav-item a {
  color: #c5d0dc;
  text-decoration: none;
  padding: 0.45rem 0.75rem;
  border-left: 3px solid transparent;
  font-size: 0.92rem;
  display: block;
}
.sidebar nav a:hover,
.nav-item a:hover {
  color: #fff;
  background: rgba(255,255,255,0.04);
}
.sidebar nav a.is-active,
.nav-item.active a {
  color: #fff;
  background: rgba(217,119,6,0.15);
  border-left-color: var(--amber);
}

.sidebar-foot,
.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.82rem;
  color: #9aabbd;
}
.sidebar-user {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
  margin-bottom: 0.65rem;
}
.sidebar-foot strong,
.sidebar-user strong {
  display: block;
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}
.sidebar-foot a {
  color: #9aabbd;
  text-decoration: none;
  font-weight: 600;
}
.sidebar-foot a:hover { color: #fff; }

.main,
.app-content {
  padding: 1.5rem 1.75rem 2.5rem;
  min-width: 0;
}

.main-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.main-top-left {
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.main-top h1 {
  margin: 0;
  color: var(--navy);
  font-size: 1.75rem;
}
.lede,
.page-subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  font-weight: 400;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.45rem;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--navy);
}
.sidebar-overlay { display: none; }
.mobile-title {
  display: none;
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--navy);
  align-self: center;
}

.content-header {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}
.page-title {
  font-size: 1.75rem;
  color: var(--navy);
  margin: 0 0 0.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  background: var(--navy);
  color: #fff;
}
.btn:hover { color: #fff; filter: brightness(1.05); }
.btn-primary { background: var(--amber); color: #fff; }
.btn-primary:hover { color: #fff; }
.btn-secondary,
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--navy);
}
.btn-secondary:hover,
.btn-ghost:hover {
  color: var(--amber);
  border-color: var(--amber);
  background: transparent;
  filter: none;
}
.btn-success { background: var(--ok); }
.btn-success:hover { color: #fff; }
.btn-danger { background: var(--err); }
.btn-danger:hover { color: #fff; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.85rem; }

.card,
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}
.card:hover { box-shadow: none; }
.card-title {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.grid-cols-2,
.grid-cols-3,
.grid-cols-4 {
  display: grid;
  gap: 1rem;
}
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.stat-card {
  display: block;
  position: relative;
  padding: 1rem 1.15rem;
  padding-top: 1.25rem;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--navy);
}
.stat-card.tone-ok::before { background: var(--ok); }
.stat-card.tone-amber::before { background: var(--amber); }
.stat-card.tone-err::before { background: var(--err); }
.stat-icon { display: none; }
.stat-value {
  margin: 0;
  font-size: 1.35rem;
  color: var(--navy);
}
.stat-label {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 0.2rem;
}

.tool-tile {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--navy);
  text-decoration: none;
  min-height: 7.5rem;
}
.tool-tile:hover {
  border-color: var(--navy);
  color: var(--navy);
}
.tool-tile strong {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--navy);
}
.tool-tile span {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 400;
}

.form-group { margin-bottom: 1rem; }
.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--ink);
}
.form-control,
select.form-control,
textarea.form-control {
  width: 100%;
  padding: 0.55rem 0.7rem;
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  outline: none;
}
.form-control:focus {
  outline: 2px solid rgba(31,58,95,0.25);
  border-color: var(--navy);
  box-shadow: none;
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

.table-container { overflow-x: auto; width: 100%; }
.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}
.table th,
.table td {
  padding: 0.65rem 0.55rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  color: var(--ink);
}
.table th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-weight: 600;
  background: transparent;
}
.table tr:hover td { background: rgba(31,58,95,0.03); }
.table tr:last-child td { border-bottom: 1px solid var(--line); }
.muted { color: var(--muted); font-size: 0.85rem; }
.empty { color: var(--muted); padding: 1.5rem 0; }

.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: #eef2f6;
  color: var(--navy);
  line-height: 1.3;
}
.badge.primary { background: #e8eef5; color: var(--navy); }
.badge.success { background: #edf8f1; color: var(--ok); }
.badge.warning { background: #f5f1e8; color: #8a6a2f; }
.badge.danger { background: #fdf2f0; color: var(--err); }

.alert,
.flash {
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.alert.success,
.flash.ok { border-color: #b7e0c8; background: #edf8f1; color: var(--ok); }
.alert.error,
.flash.err { border-color: #f0c2bd; background: #fdf2f0; color: var(--err); }
.alert.warning { border-color: #e6d3a3; background: #f5f1e8; color: #8a6a2f; }

.score-circle {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: conic-gradient(var(--score-color, var(--line)) calc(var(--score, 0) * 1%), var(--line) 0);
  display: flex;
  align-items: center;
  justify-content: center;
}
.score-circle::after {
  content: "";
  position: absolute;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: #fff;
}
.score-value {
  position: relative;
  z-index: 1;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
}

.diff-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.diff-box {
  padding: 1rem;
  background: #f7f9fc;
  border: 1px dashed var(--line);
}
.diff-box.suggested {
  background: #edf8f1;
  border-color: #b7e0c8;
}

.markdown-body h1 { font-size: 1.5rem; margin: 0.8em 0 0.4em; color: var(--navy); }
.markdown-body h2 { font-size: 1.2rem; margin: 0.8em 0 0.4em; color: var(--navy); border-bottom: 1px solid var(--line); padding-bottom: 4px; }
.markdown-body h3 { font-size: 1.05rem; margin: 0.8em 0 0.4em; color: var(--navy); }
.markdown-body p { margin-bottom: 1em; color: var(--muted); line-height: 1.6; }
.markdown-body ul, .markdown-body ol { margin-left: 1.25rem; margin-bottom: 1em; }
.markdown-body li { margin-bottom: 0.4em; color: var(--muted); }
.markdown-body code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: #eef2f6; padding: 2px 4px; font-size: 90%; }
.markdown-body pre { background: var(--navy-deep); color: #f8fafc; padding: 1rem; overflow-x: auto; margin-bottom: 1em; }
.markdown-body pre code { background: none; color: inherit; padding: 0; }

.tabs {
  display: flex;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.15rem;
  gap: 1rem;
}
.tab-btn {
  padding: 0.55rem 0.1rem;
  font-weight: 600;
  color: var(--muted);
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  background: none;
}
.tab-btn:hover { color: var(--navy); }
.tab-btn.active {
  color: var(--navy);
  border-bottom-color: var(--amber);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  background: #f7f9fc;
  border: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  font-size: 0.88rem;
}
.history-item a { font-weight: 600; }

.auth-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
  background:
    radial-gradient(ellipse at top right, rgba(217,119,6,0.12), transparent 45%),
    linear-gradient(160deg, #eef2f6, var(--cream));
}
.auth-card {
  width: min(480px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 2rem;
}
.auth-card h1 { margin: 0.25rem 0 0.75rem; font-size: 1.6rem; color: var(--navy); }
.auth-logo {
  display: block;
  max-width: 200px;
  max-height: 64px;
  margin: 0 auto 0.35rem;
}
.brand-mark { margin: 0; text-align: center; color: var(--amber); letter-spacing: 0.02em; }
.lede, .hint { color: var(--muted); font-size: 0.95rem; }
.auth-card label {
  display: block;
  margin: 0.85rem 0 0.35rem;
  font-weight: 600;
  font-size: 0.92rem;
}
.auth-card input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
}
.auth-card input:focus {
  outline: 2px solid rgba(31,58,95,0.25);
  border-color: var(--navy);
}
.flash {
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  background: #fff;
}
.flash.err { border-color: #f0c2bd; background: #fdf2f0; color: var(--err); }
.captcha-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.35rem 0 0.55rem;
}
.captcha-image {
  border: 1px solid var(--line);
  background: #fff;
  line-height: 0;
}
.captcha-refresh {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--navy);
  text-decoration: none;
  font-size: 1.2rem;
}
.captcha-refresh:hover { color: var(--amber); }
.status-box {
  padding: 0.85rem 1rem;
  margin-bottom: 1.15rem;
  border: 1px solid var(--line);
  font-size: 0.92rem;
}
.status-box.success { border-color: #b7e0c8; background: #edf8f1; color: var(--ok); }
.status-box.error { border-color: #f0c2bd; background: #fdf2f0; color: var(--err); }
.code-block {
  background: #eef2f6;
  padding: 0.75rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  margin: 0.75rem 0;
  color: var(--ink);
}
.step-indicator {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}
.auth-card .btn { width: 100%; }

@media (max-width: 1024px) {
  .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .app-shell,
  .app-container { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  .mobile-title { display: block; }
  .sidebar,
  .app-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(280px, 86vw);
    z-index: 1000;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    overflow-y: auto;
    height: auto;
  }
  .sidebar.is-open,
  .app-sidebar.is-open {
    transform: translateX(0);
    box-shadow: 8px 0 24px rgba(0,0,0,0.2);
  }
  .sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(21,42,69,0.45);
    z-index: 999;
  }
  .sidebar-overlay[hidden] { display: none !important; }
  .diff-container { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4 { grid-template-columns: 1fr; }
  .main, .app-content { padding: 1.15rem 1rem 2rem; }
}