:root {
  color-scheme: light;
  --ink: #17211d;
  --muted: #64716b;
  --paper: #f4f3ed;
  --card: #fffef9;
  --line: #d8dbd2;
  --lime: #d8ff54;
  --teal: #185f55;
  --red: #a63e2f;
  --shadow: 0 18px 45px rgba(23, 33, 29, .1);
  --topbar: rgba(244,243,237,.92);
  --tabs-bg: #e6e7df;
  --input: #fff;
  --filter: rgba(255,254,249,.8);
  --checker-a: #e7e8df;
  --checker-b: #d6d8cf;
  --sprite-frame: rgba(23,33,29,.86);
  --sprite-frame-halo: rgba(255,254,249,.72);
  --tag-bg: #e7eee9;
  --empty-bg: rgba(255,255,255,.45);
  --backdrop: rgba(23,33,29,.55);
  --lime-hover: #c5ed3d;
  --lime-text: #111714;
  --dark-hover: #293630;
  --ghost-hover: #ecebe4;
  --danger-hover: #f8e8e4;
  --solid-bg: #17211d;
  --solid-text: #fff;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #edf2ed;
  --muted: #aab5af;
  --paper: #111714;
  --card: #1a231f;
  --line: #35423c;
  --lime: #bfe845;
  --teal: #7ed2c1;
  --red: #ff9b8c;
  --shadow: 0 18px 45px rgba(0, 0, 0, .35);
  --topbar: rgba(17,23,20,.92);
  --tabs-bg: #26312c;
  --input: #121a16;
  --filter: rgba(26,35,31,.86);
  --checker-a: #202a25;
  --checker-b: #334139;
  --sprite-frame: rgba(237,242,237,.9);
  --sprite-frame-halo: rgba(0,0,0,.52);
  --tag-bg: #263a33;
  --empty-bg: rgba(26,35,31,.55);
  --backdrop: rgba(0,0,0,.68);
  --lime-hover: #abd32f;
  --lime-text: #111714;
  --dark-hover: #c9d5cd;
  --ghost-hover: #28332e;
  --danger-hover: #402724;
  --solid-bg: #dfe8e2;
  --solid-text: #111714;
}

/* Global layout and navigation */
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(color-mix(in srgb, var(--ink) 4%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ink) 4%, transparent) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: Inter, "Noto Sans TC", system-ui, sans-serif;
}
button, input, select { font: inherit; }
button { cursor: pointer; transition: color .15s ease, background-color .15s ease, border-color .15s ease, transform .15s ease, box-shadow .15s ease; }
button:disabled { cursor: not-allowed; opacity: .55; }
.hidden { display: none !important; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: var(--topbar);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: inherit; font-weight: 800; text-decoration: none; }
.brand-mark {
  width: 24px; height: 24px; border: 5px solid var(--ink);
  box-shadow: 8px 8px 0 -4px var(--lime);
}
.tabs { display: flex; gap: 5px; padding: 5px; border-radius: 999px; background: var(--tabs-bg); }
.tab { padding: 9px 18px; border: 0; border-radius: 999px; color: var(--muted); background: transparent; }
.tab.active { color: var(--solid-text); background: var(--solid-bg); }
.tab:not(.active):hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 9%, transparent); }
.session { justify-self: end; display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--muted); }
.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: var(--card);
}
.theme-toggle:hover { background: var(--ghost-hover); transform: translateY(-1px); }
.theme-icon { font-size: 20px; line-height: 1; }

main { width: min(1180px, 92vw); margin: 0 auto; padding: 44px 0 80px; }
.view { display: none; }
.view.active { display: block; }
.hero { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 34px; }
.hero.compact { margin-bottom: 28px; }
h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 6vw, 76px); line-height: .98; letter-spacing: -.055em; }
.compact h1 { font-size: clamp(34px, 5vw, 60px); }
.hero p:not(.eyebrow) { max-width: 620px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }
.eyebrow { margin: 0 0 12px; color: var(--teal); font-size: 12px; font-weight: 900; letter-spacing: .16em; }

.button {
  min-height: 42px; padding: 10px 18px; border: 1px solid var(--ink); border-radius: 8px;
  background: transparent; color: var(--ink); font-weight: 750;
}
.button.primary { color: var(--lime-text); background: var(--lime); box-shadow: 4px 4px 0 var(--ink); }
.button.primary:hover { background: var(--lime-hover); transform: translate(1px,1px); box-shadow: 3px 3px 0 var(--ink); }
.button.dark { color: var(--solid-text); background: var(--solid-bg); }
.button.ghost { border-color: var(--line); background: var(--card); }
.button.danger { color: var(--red); border-color: #e6b8b0; background: #fff8f6; }
.button.dark:hover { background: var(--dark-hover); }
.button.ghost:hover { background: var(--ghost-hover); }
.button.danger:hover { background: var(--danger-hover); border-color: var(--red); }
.icon-button { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); background: var(--input); font-size: 24px; }
.icon-button:hover { background: var(--ghost-hover); transform: rotate(5deg); }

label { display: grid; gap: 7px; color: var(--muted); font-size: 13px; font-weight: 700; }
input, select {
  width: 100%; min-height: 43px; padding: 9px 12px; border: 1px solid var(--line);
  border-radius: 7px; outline: 0; background: var(--input); color: var(--ink);
}
input:focus, select:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(24,95,85,.12); }
.filter-bar {
  display: grid; grid-template-columns: 1.2fr 1.2fr .7fr .8fr auto; align-items: end;
  gap: 12px; margin-bottom: 24px; padding: 16px; border: 1px solid var(--line); background: var(--filter);
}
.check-label { display: flex; flex-direction: row; align-items: center; min-height: 43px; color: var(--ink); }
.check-label input { width: 18px; min-height: 18px; }
.upload-option { justify-content: start; gap: 10px; min-height: auto; }

/* Sprite and pack cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 16px; }
.sprite-card, .pack-card {
  border: 1px solid var(--line); border-radius: 12px; background: var(--card); box-shadow: 0 4px 0 rgba(23,33,29,.04);
}
.sprite-card { overflow: hidden; }
.preview {
  display: grid; place-items: center; min-height: 176px; background-color: var(--checker-a);
  background-image: linear-gradient(45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-b) 75%);
  background-size: 20px 20px; background-position: 0 0,0 10px,10px -10px,-10px 0;
}
.preview-trigger { width: 100%; padding: 0; border: 0; color: inherit; }
.preview-trigger:hover { filter: brightness(.92); }
.preview-trigger:focus-visible { outline: 3px solid var(--teal); outline-offset: -3px; }
.preview canvas { width: 128px; height: 128px; image-rendering: pixelated; }
.preview canvas,
.upload-preview canvas,
.selected-preview canvas,
.library-preview canvas,
.large-preview canvas {
  display: block;
  border: 2px solid var(--sprite-frame);
  background: transparent;
  box-shadow: 0 0 0 1px var(--sprite-frame-halo);
}
.card-body { padding: 15px; }
.card-title { display: flex; align-items: start; justify-content: space-between; gap: 8px; }
.card-title h3 { margin: 0; overflow-wrap: anywhere; font-size: 18px; }
.meta { color: var(--muted); font-size: 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 5px; min-height: 24px; margin-top: 10px; }
.tag { padding: 4px 7px; border-radius: 999px; background: var(--tag-bg); color: var(--teal); font-size: 11px; }
.uploader { margin: 9px 0 0; color: var(--muted); font-size: 12px; overflow-wrap: anywhere; }
.card-actions { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 14px; }
.card-actions .button { min-height: 34px; padding: 6px 10px; font-size: 12px; }

.pack-list { display: grid; gap: 12px; }
.pack-card { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px; }
.pack-card h3 { margin: 0 0 5px; font-size: 21px; }
.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 70px; color: var(--muted); }
.empty { grid-column: 1 / -1; padding: 70px 20px; border: 1px dashed var(--line); text-align: center; color: var(--muted); background: var(--empty-bg); }

.account-layout { display: grid; grid-template-columns: minmax(0, 520px); justify-content: center; max-width: 900px; margin: 30px auto; }
.account-dashboard { display: grid; gap: 24px; }
.account-header { display: flex; align-items: end; justify-content: space-between; gap: 22px; }
.account-header h1 { font-size: clamp(38px, 6vw, 68px); }
.account-tabs { display: flex; gap: 5px; padding: 5px; border-radius: 999px; background: var(--tabs-bg); }
.account-tab { padding: 10px 16px; border: 0; border-radius: 999px; color: var(--muted); background: transparent; font-weight: 750; }
.account-tab:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 9%, transparent); }
.account-tab.active { color: var(--solid-text); background: var(--solid-bg); }
.account-section { display: none; }
.account-section.active { display: block; }
.panel { display: grid; gap: 18px; padding: clamp(24px, 5vw, 48px); border: 1px solid var(--line); border-radius: 14px; background: var(--card); box-shadow: var(--shadow); }
.panel h2 { margin: 0; font-size: 36px; }
.profile-panel { max-width: 620px; }
input[readonly] { color: var(--muted); background: color-mix(in srgb, var(--input) 80%, var(--line)); }
.account-filter { grid-template-columns: 1fr .7fr auto; }
.auth-switch { margin: 0; color: var(--muted); text-align: center; font-size: 14px; }
.text-button { padding: 2px; border: 0; color: var(--teal); background: transparent; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
.text-button:hover { color: var(--ink); background: color-mix(in srgb, var(--teal) 12%, transparent); }
.notice { position: fixed; right: 24px; bottom: 24px; z-index: 100; max-width: min(460px, calc(100vw - 48px)); padding: 14px 18px; border: 1px solid var(--ink); border-radius: 8px; color: var(--lime-text); background: var(--lime); box-shadow: 5px 5px 0 var(--ink); }
.notice.error { color: white; border-color: #72291f; background: var(--red); box-shadow: 5px 5px 0 #72291f; }

dialog { width: min(720px, 94vw); max-height: 90vh; padding: 0; border: 1px solid var(--ink); border-radius: 14px; background: var(--card); box-shadow: var(--shadow); }
dialog::backdrop { background: var(--backdrop); backdrop-filter: blur(5px); }
dialog:open { animation: appear .16s ease-out; }
@keyframes appear { from { opacity: 0; transform: translateY(10px) scale(.98); } }
.dialog-form { display: grid; gap: 17px; padding: 26px; }
.dialog-heading { display: flex; align-items: start; justify-content: space-between; }
.dialog-heading h2 { margin: 0; font-size: 32px; }
.hint { margin: 0; color: var(--muted); font-size: 13px; }
#upload-dialog { width: min(820px, 96vw); }
.upload-workbench {
  display: grid;
  grid-template-columns: minmax(230px, 280px) 1fr;
  gap: 18px;
}
.upload-preview, .upload-controls {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.upload-preview {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  min-height: 300px;
  text-align: center;
  background-color: var(--checker-a);
  background-image: linear-gradient(45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-b) 75%);
  background-size: 20px 20px;
  background-position: 0 0,0 10px,10px -10px,-10px 0;
}
.upload-preview canvas {
  width: min(256px, 66vw);
  height: min(256px, 66vw);
  image-rendering: pixelated;
  touch-action: none;
}
.upload-preview canvas.can-pan { cursor: grab; }
.upload-preview canvas.dragging { cursor: grabbing; }
.upload-preview .hint {
  padding: 4px 7px;
  border-radius: 5px;
  background: color-mix(in srgb, var(--card) 88%, transparent);
}
.upload-controls { display: grid; align-content: start; gap: 16px; background: var(--filter); }
.upload-pan-controls { display: grid; gap: 9px; }
.pan-buttons { display: flex; flex-wrap: wrap; gap: 6px; }
.pan-buttons .button { min-width: 42px; padding-inline: 10px; }
.pack-editor { width: 100%; }
#pack-dialog { width: min(1040px, 96vw); }
.editor-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; min-height: 360px; }
.editor-columns section { min-width: 0; padding: 14px; border: 1px solid var(--line); border-radius: 10px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; }
.section-heading h3 { margin: 0 0 12px; }
.selected-list, .library-list { display: grid; gap: 7px; max-height: 360px; margin: 0; padding: 0; overflow: auto; }
.selected-list { list-style: none; }
.selected-item, .library-item { align-items: center; gap: 8px; padding: 9px; border: 1px solid var(--line); border-radius: 7px; background: var(--input); }
.selected-item {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr) auto;
  gap: 10px;
  min-height: 68px;
}
.selected-item.dragging { opacity: .45; }
.selected-preview {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--checker-a);
  background-image: linear-gradient(45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-b) 75%);
  background-size: 10px 10px;
  background-position: 0 0,0 5px,5px -5px,-5px 0;
}
.selected-preview canvas { width: 44px; height: 44px; image-rendering: pixelated; }
.selected-details { display: grid; min-width: 0; gap: 3px; }
.selected-details .item-name { font-size: 14px; }
.item-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 700; }
.mini-actions { display: flex; gap: 4px; }
.mini-actions button { min-width: 30px; height: 30px; padding: 0 7px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink); background: var(--paper); }
.mini-actions button:hover { background: var(--ghost-hover); }
.inline-search { display: flex; gap: 7px; margin-bottom: 10px; }
.editor-source-tabs {
  display: flex;
  gap: 5px;
  margin-bottom: 10px;
  padding: 4px;
  border-radius: 8px;
  background: var(--tabs-bg);
}
.editor-source-tab {
  flex: 1;
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-weight: 750;
}
.editor-source-tab:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 9%, transparent); }
.editor-source-tab.active { color: var(--solid-text); background: var(--solid-bg); }
.editor-folder-field { margin-bottom: 10px; }
.editor-search-row { width: 100%; }
.editor-search-row input { min-width: 0; }
.editor-search-row .button {
  flex: 0 0 auto;
  min-width: 76px;
  white-space: nowrap;
}
.library-item { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 12px; min-height: 82px; }
.library-preview {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background-color: var(--checker-a);
  background-image: linear-gradient(45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-b) 75%);
  background-size: 12px 12px;
  background-position: 0 0,0 6px,6px -6px,-6px 0;
}
.library-preview canvas { width: 56px; height: 56px; image-rendering: pixelated; }
.library-details { display: grid; min-width: 0; gap: 3px; }
.library-details .item-name { font-size: 15px; }
.library-tags { min-height: 0; margin-top: 3px; }
.library-tags .tag { padding: 3px 6px; font-size: 10px; }

/* Preview and favorite collection dialogs */
.sprite-preview-dialog { width: min(620px, 94vw); }
.large-preview {
  display: grid;
  place-items: center;
  min-height: 430px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background-color: var(--checker-a);
  background-image: linear-gradient(45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(-45deg,var(--checker-b) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker-b) 75%),linear-gradient(-45deg,transparent 75%,var(--checker-b) 75%);
  background-size: 28px 28px;
  background-position: 0 0,0 14px,14px -14px,-14px 0;
}
.large-preview canvas { width: min(384px, 72vw); height: min(384px, 72vw); image-rendering: pixelated; }
.preview-metadata { display: flex; align-items: end; justify-content: space-between; gap: 20px; }
.preview-metadata .tags { margin-top: 8px; }
.favorite-heart {
  flex: 0 0 auto;
  width: 54px;
  height: 54px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--red);
  background: var(--card);
  font-size: 34px;
  line-height: 1;
}
.favorite-heart:hover { background: var(--danger-hover); transform: scale(1.06); }
.favorite-heart.active { color: #e83f55; background: color-mix(in srgb, #e83f55 14%, var(--card)); }
.favorites-layout { display: grid; grid-template-columns: minmax(250px, 320px) 1fr; gap: 18px; }
.favorite-sidebar, .favorite-content {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}
.favorite-sidebar { align-self: start; }
.favorite-sidebar .button { white-space: nowrap; }
.favorite-sidebar h2, .favorite-folder-heading h2 { margin: 0; }
.favorite-folder-list { display: grid; gap: 8px; margin-top: 14px; }
.favorite-folder-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--input);
  text-align: left;
}
.favorite-folder-button:hover { background: var(--ghost-hover); }
.favorite-folder-button.active { border-color: var(--teal); box-shadow: inset 4px 0 0 var(--teal); }
.favorite-folder-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.favorite-content > .empty { min-height: 280px; display: grid; place-items: center; }
.favorite-picker-dialog { width: min(560px, 94vw); }
.favorite-picker-list { display: grid; gap: 8px; max-height: 340px; overflow: auto; }
.favorite-picker-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--input);
}
.favorite-picker-item label { display: flex; flex: 1; align-items: center; gap: 10px; color: var(--ink); font-size: 14px; }
.favorite-picker-item input { width: 18px; min-height: 18px; }

@media (max-width: 820px) {
  .topbar { grid-template-columns: 1fr auto; padding: 10px 4vw; }
  .tabs { grid-column: 1 / -1; grid-row: 2; justify-self: center; margin-top: 8px; }
  .session { grid-column: 2; grid-row: 1; }
  .hero { align-items: start; flex-direction: column; }
  .filter-bar { grid-template-columns: 1fr 1fr; }
  .filter-bar .button { grid-column: 1 / -1; }
  .account-layout, .editor-columns { grid-template-columns: 1fr; }
  .upload-workbench { grid-template-columns: 1fr; }
  .account-header { align-items: start; flex-direction: column; }
  .favorites-layout { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  main { padding-top: 30px; }
  .session span { display: none; }
  .filter-bar { grid-template-columns: 1fr; }
  .filter-bar .button { grid-column: auto; }
  .pack-card { align-items: start; flex-direction: column; }
  .tabs .tab { padding-inline: 13px; }
  .library-item { grid-template-columns: 54px minmax(0, 1fr) auto; gap: 8px; }
  .library-preview { width: 54px; height: 54px; }
  .library-preview canvas { width: 48px; height: 48px; }
  .selected-item { grid-template-columns: 46px minmax(0, 1fr); }
  .selected-preview { width: 46px; height: 46px; }
  .selected-preview canvas { width: 40px; height: 40px; }
  .selected-item .mini-actions { grid-column: 1 / -1; justify-content: end; }
  .account-tabs { width: 100%; overflow-x: auto; }
  .account-tab { flex: 1 0 auto; }
  .account-filter { grid-template-columns: 1fr; }
  .favorite-folder-heading { align-items: start; flex-direction: column; }
}