:root {
  color-scheme: light;
  --ink: #30302e;
  --muted: #8b8983;
  --line: rgba(48, 48, 46, 0.13);
  --surface: rgba(255, 255, 255, 0.72);
  --surface-focus: rgba(255, 255, 255, 0.9);
  --accent: #7e8f84;
  --accent-dark: #687a70;
  --accent-soft: rgba(126, 143, 132, 0.11);
  --accent-soft-strong: rgba(126, 143, 132, 0.15);
  --background: #f5f1eb;
  --page-glow: rgba(255, 255, 255, 0.36);
  --sidebar-surface: rgba(250, 248, 244, 0.72);
  --sidebar-surface-solid: rgba(249, 247, 243, 0.96);
  --dialog-surface: rgba(255, 255, 255, 0.95);
  --option-surface: rgba(255, 255, 255, 0.52);
  --backdrop: rgba(48, 48, 46, 0.2);
  --placeholder: #aaa69e;
  --ambient-left-start: #eee2da;
  --ambient-left-mid: #e5d8d0;
  --ambient-left-end: #ded2ca;
  --ambient-right-start: #e2ebe5;
  --ambient-right-mid: #d7e2db;
  --ambient-right-end: #cedbd3;
  --shadow: rgba(78, 70, 60, 0.085);
  --shadow-strong: rgba(47, 43, 37, 0.2);
  --inset-highlight: rgba(255, 255, 255, 0.8);
  --tooltip-surface: rgba(48, 48, 46, 0.92);
  --tooltip-ink: #fff;
  --sidebar-width: 4.5rem;
  --sidebar-expanded-width: 13.5rem;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #eeece7;
  --muted: #aaa9a3;
  --line: rgba(238, 236, 231, 0.13);
  --surface: rgba(41, 45, 42, 0.78);
  --surface-focus: rgba(48, 53, 49, 0.94);
  --accent: #83998b;
  --accent-dark: #adc1b3;
  --accent-soft: rgba(151, 174, 159, 0.12);
  --accent-soft-strong: rgba(151, 174, 159, 0.18);
  --background: #1d201e;
  --page-glow: rgba(255, 255, 255, 0.025);
  --sidebar-surface: rgba(28, 31, 29, 0.78);
  --sidebar-surface-solid: rgba(28, 31, 29, 0.97);
  --dialog-surface: rgba(35, 39, 36, 0.97);
  --option-surface: rgba(255, 255, 255, 0.025);
  --backdrop: rgba(5, 7, 6, 0.52);
  --placeholder: #858a86;
  --ambient-left-start: #574b46;
  --ambient-left-mid: #463d39;
  --ambient-left-end: #38322f;
  --ambient-right-start: #405148;
  --ambient-right-mid: #34433b;
  --ambient-right-end: #2b3731;
  --shadow: rgba(0, 0, 0, 0.24);
  --shadow-strong: rgba(0, 0, 0, 0.46);
  --inset-highlight: rgba(255, 255, 255, 0.07);
  --tooltip-surface: rgba(238, 236, 231, 0.94);
  --tooltip-ink: #242724;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  min-height: 100%;
  min-height: 100dvh;
  margin: 0;
  overflow: hidden;
}

body {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  overflow: hidden;
  background: var(--background);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: grid-template-columns 280ms var(--ease-out), background-color 240ms ease, color 240ms ease;
}

body.sidebar-expanded {
  grid-template-columns: var(--sidebar-expanded-width) minmax(0, 1fr);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.sidebar {
  position: relative;
  z-index: 20;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  align-items: center;
  overflow: visible;
  padding: 1.35rem 0.55rem 1.15rem;
  border-right: 1px solid var(--line);
  background: var(--sidebar-surface);
  backdrop-filter: blur(22px);
  transition: padding 280ms var(--ease-out), box-shadow 280ms var(--ease-out), background-color 240ms ease;
}

.sidebar-scrim {
  display: none;
}

.sidebar-toggle {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 0;
  min-height: 3.25rem;
  margin-bottom: 2.4rem;
  padding: 0.75rem;
  border: 0;
  border-radius: 1rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 520;
  text-align: left;
  white-space: nowrap;
  transition: gap 200ms ease, background 180ms ease, color 180ms ease;
}

.sidebar-toggle:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.sidebar :focus-visible {
  outline-width: 2px;
  outline-offset: -2px;
}

.sidebar-toggle svg {
  width: 1.25rem;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.65;
}

.menu-line {
  transform-box: view-box;
  transform-origin: 12px 12px;
  transition: transform 260ms var(--ease-out), opacity 150ms ease;
}

body.sidebar-expanded .menu-line--top {
  transform: translateY(5px) rotate(45deg);
}

body.sidebar-expanded .menu-line--middle {
  opacity: 0;
  transform: scaleX(0.25);
}

body.sidebar-expanded .menu-line--bottom {
  transform: translateY(-5px) rotate(-45deg);
}

.sidebar-toggle span,
.sidebar-item span {
  position: static;
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  visibility: hidden;
  white-space: nowrap;
  transform: translateX(-0.35rem);
  transition:
    max-width 150ms ease,
    opacity 100ms ease,
    transform 150ms ease,
    visibility 0s linear 150ms;
}

.sidebar-nav,
.sidebar-footer {
  display: grid;
  width: 100%;
  gap: 0.35rem;
}

.sidebar-footer {
  margin-top: auto;
}

.sidebar-item {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 0;
  min-height: 3.25rem;
  padding: 0.75rem;
  border: 0;
  border-radius: 1rem;
  background: transparent;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 520;
  text-align: left;
  white-space: nowrap;
  transition: gap 200ms ease, background 180ms ease, color 180ms ease, transform 180ms ease;
}

body.sidebar-collapsed .sidebar-toggle::after,
body.sidebar-collapsed .sidebar-item::after {
  position: absolute;
  top: 50%;
  left: calc(100% + 0.75rem);
  z-index: 30;
  padding: 0.45rem 0.65rem;
  border-radius: 0.55rem;
  background: var(--tooltip-surface);
  box-shadow: 0 0.6rem 1.5rem var(--shadow);
  color: var(--tooltip-ink);
  content: attr(data-tooltip);
  font-size: 0.72rem;
  font-weight: 560;
  letter-spacing: 0.01em;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
  transform: translate(0.25rem, -50%);
  transition: opacity 140ms ease, transform 180ms var(--ease-out);
}

body.keyboard-navigation.sidebar-collapsed .sidebar-toggle:focus-visible::after,
body.keyboard-navigation.sidebar-collapsed .sidebar-item:focus-visible::after {
  opacity: 1;
  transform: translate(0, -50%);
}

@media (hover: hover) and (pointer: fine) {
  body.sidebar-collapsed .sidebar-toggle:hover::after,
  body.sidebar-collapsed .sidebar-item:hover::after {
    opacity: 1;
    transform: translate(0, -50%);
  }
}

body.sidebar-expanded .sidebar {
  align-items: stretch;
  padding-inline: 0.8rem;
  box-shadow: 0.8rem 0 2.5rem var(--shadow);
}

body.sidebar-expanded .sidebar-toggle,
body.sidebar-expanded .sidebar-item {
  justify-content: flex-start;
  gap: 0.8rem;
}

body.sidebar-expanded .sidebar-toggle span,
body.sidebar-expanded .sidebar-item span {
  max-width: 10rem;
  opacity: 1;
  visibility: visible;
  white-space: nowrap;
  transform: translateX(0);
  transition:
    max-width 170ms ease 80ms,
    opacity 130ms ease 105ms,
    transform 170ms ease 80ms,
    visibility 0s;
}

.sidebar-item:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
  transform: translateX(2px);
}

.sidebar-item svg {
  width: 1.25rem;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.65;
}

.home-shell {
  position: relative;
  grid-column: 2;
  display: flex;
  min-width: 0;
  height: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  isolation: isolate;
  overflow: hidden;
  padding: 3rem 3rem 7vh;
  background:
    radial-gradient(circle at 50% 45%, var(--page-glow), transparent 34rem),
    var(--background);
}

.ambient-shape {
  position: absolute;
  z-index: -1;
  pointer-events: none;
  border-radius: 50%;
  opacity: 0.56;
  filter: saturate(0.85);
  animation: ambient-enter 900ms var(--ease-out) both;
}

.ambient-shape--bottom-left {
  bottom: -18rem;
  left: -3rem;
  width: 42rem;
  height: 29rem;
  background: radial-gradient(circle at 45% 25%, var(--ambient-left-start) 0, var(--ambient-left-mid) 68%, var(--ambient-left-end) 100%);
  transform: rotate(4deg);
}

.ambient-shape--bottom-right {
  right: -8rem;
  bottom: -22rem;
  width: 50rem;
  height: 34rem;
  background: radial-gradient(circle at 42% 22%, var(--ambient-right-start) 0, var(--ambient-right-mid) 66%, var(--ambient-right-end) 100%);
  transform: rotate(-5deg);
}

.welcome {
  margin-bottom: 2.5rem;
  text-align: center;
  animation: content-enter 520ms var(--ease-out) both;
}

.date {
  display: block;
  margin: 0;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

html[lang^="zh"] .date {
  letter-spacing: 0.08em;
  text-transform: none;
}

.utility-dialog {
  width: min(42rem, calc(100vw - 2rem));
  max-height: calc(100dvh - 2rem);
  padding: 0;
  border: 0;
  border-radius: 1.5rem;
  background: transparent;
  color: var(--ink);
  box-shadow: 0 1.75rem 5rem var(--shadow-strong);
}

.utility-dialog[open] {
  animation: dialog-enter 220ms var(--ease-out) both;
}

.utility-dialog.is-closing {
  animation: dialog-exit 170ms ease-in both;
  pointer-events: none;
}

.utility-dialog::backdrop {
  background: var(--backdrop);
  backdrop-filter: blur(5px);
}

.utility-dialog[open]::backdrop {
  animation: backdrop-enter 180ms ease-out both;
}

.utility-dialog.is-closing::backdrop {
  animation: backdrop-exit 170ms ease-in both;
}

.dialog-card {
  max-height: calc(100dvh - 2rem);
  overflow: auto;
  scrollbar-color: var(--muted) transparent;
  scrollbar-width: thin;
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: var(--dialog-surface);
}

.dialog-card::-webkit-scrollbar {
  width: 0.4rem;
}

.dialog-card::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--muted);
}

.dialog-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.dialog-heading h2 {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.dialog-close {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font-size: 1.35rem;
  line-height: 1;
  transition: background-color 180ms ease, color 180ms ease, transform 200ms var(--ease-out);
}

.dialog-close:hover {
  background: var(--accent-soft);
  color: var(--ink);
  transform: rotate(90deg);
}

.dialog-close:active {
  transform: rotate(90deg) scale(0.92);
}

.dialog-message {
  display: block;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.unavailable-state {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 7.5rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--accent-soft);
}

.unavailable-icon {
  display: grid;
  width: 3.25rem;
  height: 3.25rem;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 1rem;
  background: var(--accent-soft-strong);
  color: var(--accent-dark);
}

.unavailable-icon svg {
  width: 1.45rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.unavailable-label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 650;
}

.settings-section + .settings-section {
  margin-top: 1.5rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.settings-label {
  margin: 0;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 620;
}

.dialog-engine-picker,
.dialog-language-picker,
.dialog-theme-picker {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.85rem;
}

.dialog-engine-picker {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.dialog-language-picker {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.dialog-theme-picker {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.dialog-engine-picker .engine-button,
.dialog-language-picker .engine-button,
.dialog-theme-picker .engine-button {
  display: flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--option-surface);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 560;
  text-align: left;
}

.dialog-engine-picker .engine-check,
.dialog-language-picker .engine-check,
.dialog-theme-picker .engine-check {
  opacity: 0;
  color: var(--accent-dark);
  transition: opacity 150ms ease;
}

.dialog-engine-picker .engine-button.is-selected .engine-check,
.dialog-language-picker .engine-button.is-selected .engine-check,
.dialog-theme-picker .engine-button.is-selected .engine-check {
  opacity: 1;
}

.dialog-engine-picker .engine-button:hover,
.dialog-language-picker .engine-button:hover,
.dialog-theme-picker .engine-button:hover {
  border-color: rgba(104, 122, 112, 0.28);
  background: var(--accent-soft);
  color: var(--ink);
}

.dialog-engine-picker .engine-button.is-selected,
.dialog-language-picker .engine-button.is-selected,
.dialog-theme-picker .engine-button.is-selected {
  border-color: rgba(104, 122, 112, 0.34);
  background: var(--accent-soft-strong);
  color: var(--accent-dark);
}

.welcome h1 {
  margin: 0.9rem 0 0.55rem;
  font-size: clamp(2.4rem, 4.2vw, 4rem);
  font-weight: 520;
  letter-spacing: -0.055em;
}

.time {
  margin: 0;
  color: var(--accent-dark);
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.search-panel {
  width: min(100%, 41rem);
  animation: content-enter 520ms var(--ease-out) 70ms both;
}

.search-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-height: 4.65rem;
  padding: 0.6rem 0.7rem 0.6rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1.55rem;
  background: var(--surface);
  box-shadow: 0 1.4rem 3.5rem var(--shadow), 0 1px 0 var(--inset-highlight) inset;
  backdrop-filter: blur(14px);
  transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.search-row:focus-within {
  border-color: rgba(104, 122, 112, 0.5);
  background: var(--surface-focus);
  box-shadow: 0 1.5rem 3rem var(--shadow), 0 0 0 4px var(--accent-soft);
}

.search-panel.is-empty .search-row {
  border-color: rgba(104, 122, 112, 0.62);
  animation: search-nudge 280ms ease both;
}

.search-icon {
  width: 1.3rem;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--muted);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

#search-input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 1.04rem;
}

#search-input::placeholder {
  color: var(--placeholder);
}

.submit-button {
  display: grid;
  width: 3.35rem;
  height: 3.35rem;
  flex: 0 0 auto;
  place-items: center;
  border: 0;
  border-radius: 1rem;
  background: var(--accent);
  color: #fff;
  transition: background-color 180ms ease, transform 180ms var(--ease-out), box-shadow 180ms ease;
}

.submit-button:hover {
  background: var(--accent-dark);
  box-shadow: 0 0.5rem 1rem var(--shadow);
  transform: translateY(-1px);
}

.submit-button:active {
  box-shadow: none;
  transform: translateY(0) scale(0.96);
}

.submit-button svg {
  width: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  transition: transform 180ms var(--ease-out);
}

.submit-button:hover svg {
  transform: translateX(2px);
}

.engine-button {
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease;
}

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

:focus-visible {
  outline: 3px solid rgba(104, 122, 112, 0.48);
  outline-offset: 3px;
}

@keyframes content-enter {
  from {
    opacity: 0;
    transform: translateY(0.75rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ambient-enter {
  from {
    opacity: 0;
    translate: 0 2.5rem;
  }
}

@keyframes search-nudge {
  0%,
  100% {
    transform: translateX(0);
  }

  30% {
    transform: translateX(-3px);
  }

  65% {
    transform: translateX(3px);
  }
}

@keyframes dialog-enter {
  from {
    opacity: 0;
    transform: translateY(0.6rem) scale(0.98);
  }
}

@keyframes dialog-exit {
  to {
    opacity: 0;
    transform: translateY(0.45rem) scale(0.985);
  }
}

@keyframes backdrop-enter {
  from {
    opacity: 0;
  }
}

@keyframes backdrop-exit {
  to {
    opacity: 0;
  }
}

@media (max-height: 620px) {
  .home-shell {
    padding-block: 1.5rem;
  }

  .welcome {
    margin-bottom: 1.5rem;
  }

  .welcome h1 {
    margin-top: 0.45rem;
  }
}

@media (max-width: 720px) {
  body {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    transition: none;
  }

  body.sidebar-expanded {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-width);
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--sidebar-surface-solid);
    transition: width 280ms var(--ease-out), padding 280ms var(--ease-out), box-shadow 280ms var(--ease-out);
  }

  body.sidebar-expanded .sidebar {
    width: min(var(--sidebar-expanded-width), calc(100vw - 3rem));
    box-shadow: 1rem 0 2.5rem rgba(48, 48, 46, 0.12);
  }

  .sidebar-scrim {
    position: fixed;
    inset: 0;
    z-index: 15;
    display: block;
    pointer-events: none;
    background: var(--backdrop);
    opacity: 0;
    transition: opacity 180ms ease;
  }

  body.sidebar-expanded .sidebar-scrim {
    pointer-events: auto;
    opacity: 1;
  }

  .home-shell {
    min-height: 100vh;
    min-height: 100dvh;
    justify-content: flex-start;
    padding: clamp(4rem, 13vh, 6.5rem) 1.1rem 2rem;
  }

  .welcome {
    margin-bottom: 1.75rem;
  }

  .welcome h1 {
    margin-top: 0.6rem;
    font-size: clamp(1.85rem, 8vw, 2.5rem);
  }

  .search-row {
    min-height: 3.8rem;
    border-radius: 1.2rem;
  }

  .submit-button {
    width: 2.85rem;
    height: 2.85rem;
    border-radius: 0.9rem;
  }

  .ambient-shape {
    opacity: 0.34;
  }

  .ambient-shape--bottom-left {
    bottom: -9rem;
    left: -8rem;
    width: 20rem;
    height: 18rem;
  }

  .ambient-shape--bottom-right {
    right: -10rem;
    bottom: -11rem;
    width: 24rem;
    height: 21rem;
  }

  .dialog-language-picker {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .dialog-card {
    padding: 1.35rem;
  }
}

@media (max-width: 360px) {
  :root {
    --sidebar-width: 4.15rem;
  }

  .home-shell {
    padding-inline: 0.9rem;
  }

  .search-row {
    gap: 0.55rem;
    padding-left: 1rem;
  }

  .search-icon {
    display: none;
  }

  #search-input {
    font-size: 0.96rem;
  }
}

@media (max-height: 680px) {
  .dialog-card {
    padding: 1rem 1.2rem;
  }

  .dialog-heading {
    margin-bottom: 0.85rem;
  }

  .dialog-heading h2 {
    font-size: 1.3rem;
  }

  .dialog-close {
    width: 2rem;
    height: 2rem;
  }

  .settings-section + .settings-section {
    margin-top: 0.8rem;
    padding-top: 0.75rem;
  }

  .dialog-engine-picker,
  .dialog-language-picker,
  .dialog-theme-picker {
    gap: 0.4rem;
    margin-top: 0.5rem;
  }

  .dialog-engine-picker .engine-button,
  .dialog-language-picker .engine-button,
  .dialog-theme-picker .engine-button {
    min-height: 2.6rem;
    padding: 0.5rem 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}