:root {
  color-scheme: dark;
  --text: #f0f3f8;
  --muted: #c0c8d6;
  --line: #4e5460;
  --link: #7db2ff;
  --panel: rgba(23, 26, 31, 0.78);
  --panel-card: rgba(30, 35, 43, 0.88);
  --topbar-bg: rgba(20, 22, 27, 0.76);
  --field-bg: rgba(255, 255, 255, 0.08);
  --bg-gradient: linear-gradient(160deg, #0f0f10 0%, #2b2d31 55%, #151618 100%);
  --overlay: linear-gradient(160deg, rgba(15, 15, 16, 0.62), rgba(43, 45, 49, 0.38), rgba(21, 22, 24, 0.62));
  --caution-band-size: 48px;
  --caution-band-shift: var(--caution-band-size);
  --ui-icon-filter: brightness(0) saturate(100%) invert(92%) sepia(14%) saturate(474%) hue-rotate(183deg) brightness(103%) contrast(96%);
}

:root[data-theme="light"] {
  color-scheme: light;
  --text: #24292f;
  --muted: #57606a;
  --line: #d0d7de;
  --link: #0969da;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-card: rgba(255, 255, 255, 0.88);
  --topbar-bg: rgba(255, 255, 255, 0.82);
  --field-bg: #ffffff;
  --bg-gradient: linear-gradient(160deg, #d9dde2 0%, #a9b0bb 55%, #c2c7d0 100%);
  --overlay: linear-gradient(160deg, rgba(246, 248, 250, 0.7), rgba(246, 248, 250, 0.52), rgba(246, 248, 250, 0.72));
  --caution-band-size: 48px;
  --caution-band-shift: var(--caution-band-size);
  --ui-icon-filter: brightness(0) saturate(100%) invert(16%) sepia(13%) saturate(793%) hue-rotate(177deg) brightness(95%) contrast(91%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
  line-height: 1.6;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  transition: color 0.28s ease, background 0.32s ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: url("../images/Background.jpg") center / cover no-repeat;
  filter: blur(7px);
  opacity: 1;
  transform: scale(1.06);
  z-index: -2;
  transition: filter 420ms ease, opacity 420ms ease, transform 420ms ease;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: -1;
  transition: background 0.32s ease;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--topbar-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: background 0.28s ease, border-color 0.28s ease;
}

.topbar-inner {
  width: min(1080px, 94%);
  margin: 0 auto;
  min-height: 74px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  font-weight: 700;
  font-size: 1.12rem;
  white-space: nowrap;
}

.brand-pic {
  width: 36px;
  height: 36px;
  margin-right: 10px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--line);
  background: #e9eef5;
  flex: 0 0 auto;
}

.brand-title {
  display: inline;
  min-width: 0;
}

.cursor {
  display: inline-block;
  animation: blink 1s steps(1) infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

.menu {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 22px;
}

.menu a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.menu a:hover,
.menu a.active {
  color: var(--link);
  border-bottom-color: var(--link);
}

.topbar-right {
  justify-self: end;
}

.topbar-tools {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tool-pop {
  position: relative;
}

.settings-btn,
.music-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--field-bg);
  color: var(--text);
  cursor: pointer;
  font-size: 1.05rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
}

.ui-icon {
  width: 16px;
  height: 16px;
  display: block;
  margin: 0 auto;
  pointer-events: none;
  filter: var(--ui-icon-filter);
}

.music-btn {
  font-size: 0;
}

.music-btn .ui-icon {
  width: 14px;
  height: 14px;
}

.settings-btn .ui-icon {
  width: 14px;
  height: 14px;
}

.settings-panel,
.music-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 240px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-card);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.2);
  display: grid;
  gap: 12px;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
}

.settings-panel.is-open,
.music-panel.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  visibility: visible;
}

.setting-row {
  display: grid;
  gap: 6px;
}

.setting-row label {
  color: var(--muted);
  font-size: 0.9rem;
}

.setting-row select {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--field-bg);
  color: var(--text);
  padding: 7px 9px;
}

.setting-row select option {
  background: #1f232b;
  color: #f0f3f8;
}

.music-panel {
  min-width: 280px;
}

.music-title {
  font-weight: 700;
  margin: 0;
}

.music-hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 8px 0;
}

.music-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.music-queue-toggle {
  min-width: 34px;
  padding: 5px 7px;
}

.music-panel audio {
  width: 100%;
  display: none;
}

.music-now {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.music-now.is-track-transition.is-track-next .music-cover,
.music-now.is-track-transition.is-track-next .music-meta {
  animation: track-swipe-fade-next 320ms ease both;
}

.music-now.is-track-transition.is-track-prev .music-cover,
.music-now.is-track-transition.is-track-prev .music-meta {
  animation: track-swipe-fade-prev 320ms ease both;
}

.music-cover {
  width: 56px;
  height: 56px;
  border-radius: 8px;
  border: 1px solid var(--line);
  object-fit: cover;
  background: #111;
  flex: 0 0 auto;
}

.music-meta {
  min-width: 0;
}

.music-track-title {
  margin: 0;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.music-track-composer {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

@keyframes track-swipe-fade-next {
  0% {
    opacity: 1;
    transform: translateX(0);
  }
  45% {
    opacity: 0;
    transform: translateX(14px);
  }
  46% {
    opacity: 0;
    transform: translateX(-14px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes track-swipe-fade-prev {
  0% {
    opacity: 1;
    transform: translateX(0);
  }
  45% {
    opacity: 0;
    transform: translateX(-14px);
  }
  46% {
    opacity: 0;
    transform: translateX(14px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

.music-progress-wrap {
  margin-top: 6px;
}

.music-progress {
  width: 100%;
}

.music-time {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--muted);
}

.music-time-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--muted);
}

.music-time-sep {
  opacity: 0.7;
}

.music-controls {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.music-play-btn {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--field-bg);
  color: var(--text);
  padding: 6px 10px;
  cursor: pointer;
  min-width: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.music-mini-btn {
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--field-bg);
  color: var(--text);
  padding: 6px 8px;
  cursor: pointer;
  min-width: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.music-volume {
  width: 100%;
  min-width: 100px;
}

.music-queue-panel {
  margin-top: 8px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
  display: block;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  pointer-events: none;
  transition: opacity 380ms ease, max-height 260ms ease;
}

.music-queue-panel.is-open {
  opacity: 1;
  max-height: 250px;
  pointer-events: auto;
}

.music-queue-title {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.music-queue-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.music-queue-list {
  display: grid;
  gap: 6px;
  max-height: 174px;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 3px;
}

.music-queue-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px;
  background: var(--field-bg);
  cursor: pointer;
}

.music-queue-item.active {
  border-color: var(--link);
}

.music-queue-item.is-selecting {
  animation: queue-item-select 260ms ease;
}

.music-queue-cover {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--line);
}

.music-queue-name {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.music-queue-artist {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes queue-item-select {
  0% {
    transform: translateX(0) scale(1);
    border-color: var(--line);
  }
  45% {
    transform: translateX(6px) scale(0.99);
    border-color: var(--link);
  }
  100% {
    transform: translateX(0) scale(1);
    border-color: var(--line);
  }
}

:root[data-theme="light"] .setting-row select option {
  background: #ffffff;
  color: #24292f;
}

.dev-banner {
  width: min(1080px, 94%);
  margin: 14px auto 0;
  position: sticky;
  top: 82px;
  z-index: 9;
  overflow: hidden;
  border: 1px solid rgba(255, 214, 26, 0.38);
  border-radius: 10px;
  padding: 11px 14px;
  color: #f7f9ff;
  font-weight: 700;
  text-align: center;
  background: rgba(9, 12, 18, 0.5);
  backdrop-filter: blur(8px);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.08),
    0 8px 18px rgba(0, 0, 0, 0.22);
  animation: section-fade-in 380ms ease both;
  transition: opacity 380ms ease;
}

.dev-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(
    -45deg,
    rgba(255, 217, 0, 0.9) 0 25%,
    rgba(20, 24, 31, 0.72) 25% 50%,
    rgba(255, 217, 0, 0.9) 50% 75%,
    rgba(20, 24, 31, 0.72) 75% 100%
  );
  background-size: var(--caution-band-size) var(--caution-band-size);
  background-position: 0 0;
  will-change: background-position;
  animation: caution-slide 1.1s linear infinite;
}

.dev-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    to bottom,
    rgba(8, 11, 16, 0.28),
    rgba(8, 11, 16, 0.44)
  );
  backdrop-filter: blur(1.2px);
}

.dev-banner p {
  position: relative;
  z-index: 2;
  display: inline-block;
  margin: 0;
  padding: 3px 12px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(7, 10, 14, 0.32);
  text-shadow:
    0 1px 2px rgba(0, 0, 0, 0.85),
    0 0 10px rgba(0, 0, 0, 0.45);
  -webkit-text-stroke: 0.2px rgba(0, 0, 0, 0.6);
}

@keyframes caution-slide {
  from { background-position: 0 0; }
  to { background-position: var(--caution-band-shift) 0; }
}

.page {
  width: min(860px, 92%);
  margin: 20px auto 34px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px 24px 20px;
  overflow: hidden;
  animation: section-fade-in 380ms ease both;
  transition: opacity 380ms ease;
}

.dev-banner.is-section-exit,
.page.is-section-exit {
  opacity: 0;
}

@keyframes section-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.section-panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-card);
  padding: 16px;
}

h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--muted);
  margin-bottom: 10px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-card);
  padding: 14px;
  margin-top: 10px;
}

p {
  margin-bottom: 10px;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

.fade-swap {
  transition: opacity 0.15s ease;
}

@media (max-width: 780px) {
  .topbar-inner {
    grid-template-columns: 1fr;
    padding: 10px 0;
    gap: 8px;
  }

  .brand,
  .menu,
  .topbar-right {
    justify-self: center;
  }

  .menu {
    flex-wrap: wrap;
    gap: 14px;
  }
}

@media (max-width: 600px) {
  .topbar-inner {
    width: min(100%, 96%);
    min-height: auto;
    gap: 10px;
  }

  .brand {
    width: 100%;
    justify-content: center;
    font-size: 1rem;
  }

  .brand-title {
    display: inline-block;
    max-width: 70vw;
    overflow: hidden;
    text-overflow: ellipsis;
    vertical-align: bottom;
  }

  .menu {
    width: 100%;
    justify-content: center;
    gap: 10px;
  }

  .menu a {
    font-size: 0.95rem;
    padding: 6px 3px;
  }

  .topbar-right {
    width: 100%;
  }

  .topbar-tools {
    width: 100%;
    justify-content: center;
  }

  .settings-panel,
  .music-panel {
    position: fixed;
    top: 84px;
    left: 10px;
    right: 10px;
    min-width: 0;
    width: auto;
    max-width: none;
  }

  .music-panel {
    max-height: calc(100vh - 100px);
    overflow-y: auto;
  }

  .music-controls {
    flex-wrap: wrap;
  }

  .music-volume {
    min-width: 0;
  }

  .music-queue-list {
    max-height: 168px;
  }

  .dev-banner {
    width: min(100%, 96%);
    margin-top: 10px;
    top: 74px;
    padding: 9px 10px;
  }

  .dev-banner p {
    font-size: 0.9rem;
    padding: 3px 8px;
  }

  .page {
    width: min(100%, 96%);
    margin-top: 12px;
    padding: 16px 12px 14px;
  }

  .section-panel {
    padding: 12px;
  }

  h1 {
    font-size: 1.45rem;
    line-height: 1.25;
  }
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }

  .dev-banner,
  .page {
    animation: none;
    transition: none;
  }
}