:root {
  --page-bg: #f4f7fb;
  --page-bg-soft: #eef3f9;
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --border: #d8e2ef;
  --border-strong: #c5d4e8;
  --text: #0f172a;
  --muted: #5b6b81;
  --primary: #1a73e8;
  --primary-soft: #e8f0fe;
  --shadow: 0 18px 44px rgba(15, 23, 42, 0.08);
  --radius: 24px;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background:
    linear-gradient(180deg, #f7f9fc, #eef3f9);
}

html[data-site-theme="dark"] {
  background: #030914;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background:
    radial-gradient(720px 340px at 0% 0%, rgba(26, 115, 232, 0.06), transparent 60%),
    linear-gradient(180deg, var(--page-bg), var(--page-bg-soft));
}

#topbar-mount {
  position: relative;
  z-index: 20;
}

.settings-shell {
  width: min(1120px, calc(100% - 28px));
  margin: 34px auto 40px;
}

.settings-layout {
  display: flex;
  align-items: flex-start;
  gap: 24px;
}

.settings-sidebar {
  position: sticky;
  top: calc(var(--kes-topbar-height, 64px) + 20px);
  width: 240px;
  flex: 0 0 240px;
  padding: 18px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.settings-sidebar-title {
  padding: 4px 10px 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.settings-sidebar-nav {
  display: grid;
  gap: 4px;
}

.settings-sidebar-nav a {
  display: block;
  position: relative;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  transition: background 0.18s ease, color 0.18s ease, padding-left 0.18s ease;
}

.settings-sidebar-nav a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 999px;
  background: transparent;
  transition: background 0.18s ease;
}

.settings-sidebar-nav a.active {
  background: var(--primary-soft);
  color: var(--primary);
  padding-left: 16px;
}

.settings-sidebar-nav a.active::before {
  background: var(--primary);
}

.settings-sidebar-nav a:hover {
  background: #eef4fb;
}

.settings-main {
  min-width: 0;
  flex: 1 1 auto;
}

.settings-page-head {
  margin-bottom: 18px;
  padding: 24px 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.settings-kicker {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.settings-page-head h1 {
  margin: 14px 0 0;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.08;
}

.settings-page-head p {
  width: min(760px, 100%);
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.72;
  font-size: 15px;
}

.settings-section {
  margin-top: 18px;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.settings-section-head {
  margin-bottom: 14px;
}

.settings-section-head h2 {
  margin: 0;
  font-size: 22px;
}

.settings-section-head p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.72;
  font-size: 15px;
}

.settings-list {
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  background: var(--surface);
}

.settings-theme-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.settings-theme-card {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, transform 0.12s ease;
}

.settings-theme-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.settings-theme-card-selected {
  background: #e8f0fe;
  border-color: #8ab4f8;
  box-shadow: inset 0 0 0 2px rgba(26, 115, 232, 0.18);
}

.settings-theme-card:focus-visible {
  outline: 3px solid rgba(26, 115, 232, 0.24);
  outline-offset: 2px;
}

.settings-theme-preview {
  height: 120px;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.settings-theme-preview-light {
  background:
    linear-gradient(180deg, #f7f9fc, #eef3f9);
}

.settings-theme-preview-dark {
  background:
    radial-gradient(120px 60px at 20% 0%, rgba(34, 211, 238, 0.18), transparent 65%),
    linear-gradient(180deg, #06101d, #030914);
}

.settings-theme-copy h3 {
  margin: 14px 0 0;
  font-size: 18px;
}

.settings-theme-copy p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.settings-quality-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.settings-quality-card {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  padding: 18px 18px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, transform 0.12s ease;
}

.settings-quality-card-selected {
  background: #e8f0fe;
  border-color: #8ab4f8;
  box-shadow: inset 0 0 0 2px rgba(26, 115, 232, 0.18);
}

.settings-quality-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.settings-quality-card:focus-visible {
  outline: 3px solid rgba(26, 115, 232, 0.24);
  outline-offset: 2px;
}

.settings-quality-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.settings-quality-head h3 {
  margin: 0;
  font-size: 18px;
}

.settings-quality-card p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.68;
  font-size: 14px;
}

.settings-quality-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--text);
}

.settings-quality-list li {
  margin-top: 6px;
  color: var(--text);
  line-height: 1.6;
  font-size: 14px;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  border-top: 1px solid var(--border);
}

.settings-row:first-child {
  border-top: none;
}

.settings-row-selected {
  background: #f8fbff;
}

.settings-row-copy {
  min-width: 0;
  flex: 1 1 auto;
}

.settings-row-copy h3 {
  margin: 0;
  font-size: 16px;
}

.settings-row-copy p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.settings-row-meta {
  flex: 0 0 auto;
}

.settings-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: #eef2f7;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.settings-badge-primary {
  background: var(--primary-soft);
  color: var(--primary);
}

.settings-note {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #f8fbff;
  color: var(--text);
  border: 1px solid var(--border);
  line-height: 1.7;
  font-weight: 700;
}

.settings-custom-panel {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fbfdff;
  transition: opacity 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.settings-custom-panel.is-disabled {
  background: #f3f5f8;
  border-color: #d7dde6;
  opacity: 0.72;
}

.settings-custom-head h3 {
  margin: 0;
  font-size: 18px;
}

.settings-custom-head p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

.settings-custom-list {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.settings-switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  transition: background 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
}

.settings-custom-panel.is-disabled .settings-switch-row {
  background: #f6f7f9;
  border-color: #dde3eb;
}

.settings-switch-copy {
  min-width: 0;
}

.settings-switch-copy strong {
  display: block;
  font-size: 15px;
}

.settings-switch-copy small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.6;
  font-size: 13px;
}

.settings-custom-panel.is-disabled .settings-switch-copy strong,
.settings-custom-panel.is-disabled .settings-switch-copy small {
  color: #7a8798;
}

.settings-switch {
  position: relative;
  flex: 0 0 auto;
  width: 52px;
  height: 32px;
}

.settings-switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.settings-switch input:disabled {
  cursor: not-allowed;
}

.settings-switch-slider {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: #d5dce6;
  transition: background 0.18s ease;
}

.settings-switch-slider::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.18);
  transition: transform 0.18s ease;
}

.settings-switch input:checked + .settings-switch-slider {
  background: var(--primary);
}

.settings-switch input:checked + .settings-switch-slider::after {
  transform: translateX(20px);
}

.settings-switch input:disabled + .settings-switch-slider {
  background: #d8dee7;
}

.settings-switch input:disabled:checked + .settings-switch-slider {
  background: #b7c4d8;
}

.settings-switch input:disabled + .settings-switch-slider::after {
  background: #f7f9fc;
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.12);
}

.settings-switch input:focus-visible + .settings-switch-slider {
  outline: 3px solid rgba(26, 115, 232, 0.24);
  outline-offset: 2px;
}

@media (max-width: 980px) {
  .settings-layout {
    flex-direction: column;
  }

  .settings-sidebar {
    position: static;
    width: 100%;
    flex-basis: auto;
  }

  .settings-theme-grid,
  .settings-quality-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .settings-shell {
    width: min(100% - 16px, 1120px);
    margin-top: 24px;
  }

  .settings-page-head,
  .settings-section,
  .settings-sidebar {
    border-radius: 20px;
  }

  .settings-page-head,
  .settings-section {
    padding: 18px 16px;
  }

  .settings-row {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
  }

  .settings-row-meta {
    width: 100%;
  }

  .settings-switch-row {
    align-items: flex-start;
  }
}