:root {
  --bg-paper: #FAF8F5;
  --bg-card: #FFFFFF;
  --bg-subtle: #F3EFE8;
  --ink-primary: #1A1917;
  --ink-secondary: #5C5852;
  --ink-muted: #8A847C;
  --border-stone: #E4E0D8;
  --border-strong: #C9C3B8;
  --leaf-green: #2B5B42;
  --leaf-green-hover: #214834;
  --leaf-green-soft: #EAF2ED;
  --amber-warn: #9A5B13;
  --amber-soft: #FDF5EA;
  --crimson-err: #9E2A2B;
  --crimson-soft: #FDECEC;
  --font-serif: "Newsreader", "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Modern Web Guidance: improve-text-layout-and-legibility */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.18;
  text-wrap: balance;
}

p,
blockquote,
li,
.pretty-text {
  text-wrap: pretty;
}

a {
  color: var(--leaf-green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--leaf-green-hover);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Layout Shell */
.editorial-shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

.stats-shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

/* Top Bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 18px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--border-stone);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink-primary);
}

.brand-logo-img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  object-fit: cover;
  display: block;
  border: 1px solid rgba(43, 91, 66, 0.15);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-domain {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-muted);
  background: var(--bg-subtle);
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid var(--border-stone);
}

.role-switcher {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-primary);
  background-color: var(--bg-card);
  border: 1px solid var(--border-stone);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.role-switcher:hover {
  background-color: var(--bg-subtle);
  border-color: var(--border-strong);
  color: var(--ink-primary);
}

/* Hero Intro */
.hero-intro {
  text-align: center;
  margin-bottom: 26px;
}

.hero-title {
  font-size: clamp(28px, 4.5vw, 38px);
  margin-bottom: 8px;
  color: var(--ink-primary);
}

.hero-subtitle {
  font-size: 15.5px;
  color: var(--ink-secondary);
  max-width: 520px;
  margin: 0 auto;
}

/* Pairing Card */
.card-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-stone);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 2px 10px rgba(26, 25, 23, 0.03);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.step-label {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  font-weight: 600;
}

/* 4-Slot Code Input */
.code-slots-wrap {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 10px 0 16px;
}

.code-slot {
  width: 64px;
  height: 74px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--ink-primary);
  background-color: var(--bg-paper);
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.code-slot:focus {
  border-color: var(--leaf-green);
  background-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(43, 91, 66, 0.15);
}

.code-slot.is-connected {
  border-color: var(--leaf-green);
  background-color: var(--leaf-green-soft);
  color: var(--leaf-green);
}

/* Connection Badge */
.connection-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 9px;
  font-size: 13.5px;
  background-color: var(--bg-subtle);
  color: var(--ink-secondary);
  border: 1px solid var(--border-stone);
}

.connection-bar.is-connected {
  background-color: var(--leaf-green-soft);
  color: var(--leaf-green);
  border-color: rgba(43, 91, 66, 0.28);
  font-weight: 500;
}

.connection-bar.is-error {
  background-color: var(--crimson-soft);
  color: var(--crimson-err);
  border-color: rgba(158, 42, 43, 0.25);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--ink-muted);
  margin-right: 7px;
}

.connection-bar.is-connected .status-dot {
  background-color: var(--leaf-green);
}

.connection-bar.is-error .status-dot {
  background-color: var(--crimson-err);
}

/* Kepub Toggle Pill */
.kepub-toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--ink-primary);
  cursor: pointer;
  user-select: none;
}

.kepub-toggle-label input[type="checkbox"] {
  accent-color: var(--leaf-green);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

/* Dropzone */
.dropzone {
  position: relative;
  border: 2px dashed var(--border-strong);
  border-radius: 12px;
  background-color: var(--bg-paper);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone:hover,
.dropzone.is-dragover {
  border-color: var(--leaf-green);
  background-color: var(--leaf-green-soft);
}

.dropzone-icon {
  font-size: 28px;
  margin-bottom: 8px;
  color: var(--leaf-green);
}

.dropzone-title {
  font-family: var(--font-serif);
  font-size: 21px;
  color: var(--ink-primary);
  margin-bottom: 4px;
}

.dropzone-hint {
  font-size: 13.5px;
  color: var(--ink-secondary);
}

.dropzone-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* Full-Window Drag Overlay */
.window-drop-overlay {
  position: fixed;
  inset: 14px;
  z-index: 999;
  background-color: rgba(250, 248, 245, 0.94);
  border: 3px dashed var(--leaf-green);
  border-radius: 18px;
  display: none;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
}

.window-drop-overlay.is-active {
  display: flex;
}

.window-drop-inner h2 {
  font-size: 32px;
  color: var(--leaf-green);
  margin-bottom: 6px;
}

/* Article URL Section */
.article-block {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--border-stone);
}

.article-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.article-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-primary);
}

.article-desc {
  font-size: 13.5px;
  color: var(--ink-secondary);
}

.article-form {
  display: flex;
  gap: 10px;
}

.article-input {
  flex: 1;
  padding: 11px 14px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  color: var(--ink-primary);
  background-color: var(--bg-paper);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  outline: none;
}

.article-input:focus {
  border-color: var(--leaf-green);
  background-color: #ffffff;
}

.btn-leaf {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 18px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--leaf-green);
  border: 1px solid var(--leaf-green);
  border-radius: 9px;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease;
}

.btn-leaf:hover:not(:disabled) {
  background-color: var(--leaf-green-hover);
}

.btn-leaf:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Transfer Queue List */
.queue-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.queue-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background-color: var(--bg-paper);
  border: 1px solid var(--border-stone);
  border-radius: 10px;
}

.queue-item-main {
  min-width: 0;
  flex: 1;
}

.queue-item-name {
  font-weight: 600;
  font-size: 14.5px;
  color: var(--ink-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.queue-item-meta {
  font-size: 12.5px;
  color: var(--ink-secondary);
  margin-top: 2px;
}

.queue-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 99px;
  white-space: nowrap;
}

.queue-pill.is-waiting {
  background-color: var(--amber-soft);
  color: var(--amber-warn);
}

.queue-pill.is-converting,
.queue-pill.is-uploading {
  background-color: var(--bg-subtle);
  color: var(--ink-primary);
}

.queue-pill.is-sent {
  background-color: var(--leaf-green-soft);
  color: var(--leaf-green);
}

.queue-pill.is-downloaded {
  background-color: var(--leaf-green);
  color: #ffffff;
}

.queue-pill.is-error {
  background-color: var(--crimson-soft);
  color: var(--crimson-err);
}

/* Footer */
.editorial-footer {
  margin-top: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.editorial-footer-links {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.editorial-footer-links a {
  color: var(--ink-secondary);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.editorial-footer-links a:hover {
  color: var(--leaf-green);
}

/* /stats Dashboard Grid & Responsive Table (modern-web-guidance: responsive-table) */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.kpi-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-stone);
  border-radius: 12px;
  padding: 18px;
}

.kpi-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.kpi-value {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 600;
  color: var(--ink-primary);
  margin-top: 4px;
}

.kpi-sub {
  font-size: 12.5px;
  color: var(--ink-secondary);
  margin-top: 2px;
}

.stats-two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.bar-row {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border-stone);
  font-size: 14px;
}

.bar-row:last-child {
  border-bottom: none;
}

.bar-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.bar-track {
  width: 100%;
  height: 6px;
  background-color: var(--bg-subtle);
  border-radius: 99px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background-color: var(--leaf-green);
  border-radius: 99px;
}

.privacy-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  margin-bottom: 22px;
  border-radius: 12px;
  background-color: var(--leaf-green-soft);
  border: 1px solid rgba(43, 91, 66, 0.22);
  font-size: 13.5px;
  color: var(--ink-primary);
}

.privacy-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.privacy-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 99px;
  background-color: #ffffff;
  color: var(--leaf-green);
  border: 1px solid rgba(43, 91, 66, 0.2);
}

.daily-chart {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 140px;
  padding-top: 16px;
}

.daily-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  height: 100%;
  justify-content: flex-end;
}

.daily-bar {
  width: 100%;
  max-width: 32px;
  background-color: var(--leaf-green);
  border-radius: 4px 4px 0 0;
  min-height: 4px;
}

.daily-date {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
}

/* Responsive Data Table per modern-web-guidance `responsive-table` */
.table-wrapper {
  overflow: auto;
  max-inline-size: 100%;
  max-block-size: min(500px, 80vh);
  container-type: inline-size;
  border: 1px solid var(--border-stone);
  border-radius: 10px;
  background-color: var(--bg-card);
}

.table-wrapper table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13.5px;
}

.table-wrapper caption {
  text-align: left;
  padding: 12px 14px;
  font-weight: 600;
  color: var(--ink-secondary);
  border-bottom: 1px solid var(--border-stone);
}

.table-wrapper thead {
  position: sticky;
  inset-block-start: 0;
  z-index: 1;
  background-color: var(--bg-subtle);
}

.table-wrapper th,
.table-wrapper td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-stone);
}

.table-wrapper tbody th {
  position: sticky;
  inset-inline-start: 0;
  background-color: var(--bg-card);
  font-family: var(--font-mono);
  font-weight: 600;
}

@container (width < 600px) {
  .table-wrapper table,
  .table-wrapper thead,
  .table-wrapper tbody,
  .table-wrapper tr,
  .table-wrapper th,
  .table-wrapper td {
    display: block;
  }

  .table-wrapper thead {
    /* MANDATORY: Hide column header from layout and screen readers. */
    display: none;
  }

  .table-wrapper tr {
    margin-block-end: 1rem;
    border: 1px solid var(--border-stone);
  }

  .table-wrapper tbody th {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: var(--bg-subtle);
  }

  .table-wrapper td:nth-child(2)::before {
    content: var(--label-2) ": ";
    font-weight: 600;
    color: var(--ink-secondary);
  }

  .table-wrapper td:nth-child(3)::before {
    content: var(--label-3) ": ";
    font-weight: 600;
    color: var(--ink-secondary);
  }

  .table-wrapper td:nth-child(4)::before {
    content: var(--label-4) ": ";
    font-weight: 600;
    color: var(--ink-secondary);
  }

  .table-wrapper td:nth-child(5)::before {
    content: var(--label-5) ": ";
    font-weight: 600;
    color: var(--ink-secondary);
  }

  .table-wrapper td:nth-child(6)::before {
    content: var(--label-6) ": ";
    font-weight: 600;
    color: var(--ink-secondary);
  }
}

@media (max-width: 520px) {
  .code-slot {
    width: 56px;
    height: 66px;
    font-size: 28px;
  }
  .article-form {
    flex-direction: column;
  }
}