/* H5 Playable Toolkit — shared design system
   Inspired by portfolio style: black + jade green + champagne gold + glassmorphism */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* === core palette === */
  --bg:           #000000;
  --bg-soft:      #0a0a0c;
  --panel:        rgba(200, 210, 205, 0.05);
  --panel-2:      rgba(200, 210, 205, 0.08);
  --panel-solid:  #14141a;
  --border:       rgba(255, 255, 255, 0.08);
  --border-strong:rgba(255, 255, 255, 0.18);
  --text:         #f8f8fb;
  --text-soft:    #c2c7d6;
  --muted:        #7f859a;
  --muted-2:      #a8aebf;

  /* accent: jade green (portfolio signature) */
  --jade:         #31f59c;
  --jade-rgb:     49, 245, 156;
  --jade-soft:    rgba(49, 245, 156, 0.12);
  --jade-glow:    rgba(49, 245, 156, 0.35);

  /* warm accent: champagne gold */
  --champagne:    #f2dfb8;
  --soft-gold:    #d8c38a;
  --pearl-gold:   #f7ecd3;

  /* status */
  --success:      #31f59c;
  --warning:      #f5d031;
  --danger:       #f55b5b;

  --accent:       var(--jade);
  --accent-hover: #67ffbc;
  --accent-soft:  var(--jade-soft);

  --radius:       12px;
  --radius-sm:    8px;
  --radius-pill:  999px;

  --checker:
    linear-gradient(45deg, rgba(255,255,255,0.04) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.04) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.04) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.04) 75%);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Space Grotesk", "Inter", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  line-height: 1.5;
  overflow-x: hidden;
  letter-spacing: 0.005em;
}
a { color: inherit; text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--jade); }

/* =========================================================================
   Ambient flowing blobs — fixed background layer for atmosphere
   ========================================================================= */
.ambient-flow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  mix-blend-mode: screen;
}
.ambient-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  will-change: transform, opacity;
}
.ambient-blob--a {
  width: 45vw; height: 45vw; max-width: 700px; max-height: 700px;
  left: -8%; top: 10%;
  background: radial-gradient(circle, rgba(var(--jade-rgb), 0.32) 0%, transparent 65%);
  animation: ambientA 18s ease-in-out infinite;
}
.ambient-blob--b {
  width: 40vw; height: 40vw; max-width: 600px; max-height: 600px;
  right: -5%; top: 35%;
  background: radial-gradient(circle, rgba(159, 232, 227, 0.24) 0%, transparent 65%);
  animation: ambientB 22s ease-in-out infinite;
}
.ambient-blob--c {
  width: 50vw; height: 50vw; max-width: 800px; max-height: 800px;
  left: 20%; bottom: 10%;
  background: radial-gradient(circle, rgba(var(--jade-rgb), 0.2) 0%, transparent 65%);
  animation: ambientC 24s ease-in-out infinite;
}
.ambient-blob--d {
  width: 35vw; height: 35vw; max-width: 550px; max-height: 550px;
  right: 15%; top: 5%;
  background: radial-gradient(circle, rgba(242, 223, 184, 0.16) 0%, transparent 65%);
  animation: ambientD 20s ease-in-out infinite;
}
@keyframes ambientA {
  0%,100% { transform: translate(0, 0) scale(1);       opacity: 0.5; }
  25%     { transform: translate(8vw, 12vh) scale(1.1); opacity: 0.8; }
  50%     { transform: translate(3vw, 25vh) scale(0.95);opacity: 0.6; }
  75%     { transform: translate(-5vw, 10vh) scale(1.15);opacity: 0.9; }
}
@keyframes ambientB {
  0%,100% { transform: translate(0, 0) scale(1);        opacity: 0.4; }
  30%     { transform: translate(-10vw, -8vh) scale(1.15); opacity: 0.75; }
  60%     { transform: translate(-5vw, 10vh) scale(0.9);   opacity: 0.55; }
}
@keyframes ambientC {
  0%,100% { transform: translate(0, 0) scale(1);        opacity: 0.35; }
  35%     { transform: translate(6vw, -15vh) scale(1.2); opacity: 0.7; }
  70%     { transform: translate(-4vw, -5vh) scale(0.95);opacity: 0.5; }
}
@keyframes ambientD {
  0%,100% { transform: translate(0, 0) scale(1);        opacity: 0.3; }
  40%     { transform: translate(10vw, 8vh) scale(1.1); opacity: 0.6; }
  80%     { transform: translate(-8vw, -10vh) scale(0.95); opacity: 0.45; }
}

/* =========================================================================
   Top navigation — glassmorphism pill with hover-following glow
   ========================================================================= */
/* wrapper holding the back-pill (tool pages) + main topbar pill, sticky together */
.topbar-wrap {
  position: sticky;
  top: 16px;
  z-index: 9000;
  width: min(1280px, calc(100% - 36px));
  margin: 16px auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.topbar-wrap .topbar {
  flex: 1;
  margin: 0 !important;
  width: auto !important;
  position: relative !important;
  top: auto !important;
}

.topbar {
  --mx: 50%;
  --my: 50%;
  position: sticky;
  top: 16px;
  z-index: 9000;
  width: min(1180px, calc(100% - 36px));
  margin: 16px auto 24px;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  border-radius: var(--radius-pill);
  background: rgba(200, 210, 205, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(0, 0, 0, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.18),
    0 1px 2px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  transition: background-color 0.22s ease;
}
.topbar::before,
.topbar::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  pointer-events: none;
}
.topbar::before {
  z-index: 0;
  background: radial-gradient(180px circle at var(--mx) var(--my), rgba(var(--jade-rgb), 0.22), rgba(var(--jade-rgb), 0) 72%);
  opacity: 0;
  transition: opacity 0.22s ease;
}
.topbar::after {
  z-index: 1;
  padding: 1px;
  background: radial-gradient(220px circle at var(--mx) var(--my),
    rgba(var(--jade-rgb), 1) 0%,
    rgba(var(--jade-rgb), 0.82) 18%,
    rgba(var(--jade-rgb), 0.5) 34%,
    rgba(var(--jade-rgb), 0.16) 58%,
    rgba(var(--jade-rgb), 0) 78%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0;
  filter:
    drop-shadow(0 0 10px rgba(var(--jade-rgb), 0.48))
    drop-shadow(0 0 22px rgba(var(--jade-rgb), 0.28))
    drop-shadow(0 0 42px rgba(var(--jade-rgb), 0.14));
  transition: opacity 0.22s ease, filter 0.22s ease;
}
.topbar:hover::before,
.topbar:hover::after,
.topbar:focus-within::before,
.topbar:focus-within::after {
  opacity: 1;
}
.topbar > * { position: relative; z-index: 2; }

.topbar .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
  font-family: "Space Grotesk", sans-serif;
}
.topbar .brand .logo {
  width: 22px; height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--jade), #67ffbc 62%, #0dcf79);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  box-shadow: 0 2px 8px rgba(var(--jade-rgb), 0.4);
}
.topbar nav {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.topbar .nav-group {
  position: relative;
}
.topbar .nav-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  color: var(--text-soft);
  white-space: nowrap;
  transition: all 0.15s;
  font-weight: 500;
}
.topbar .nav-cat .cat-icon { font-size: 14px; }
.topbar .nav-cat .caret {
  font-size: 9px;
  margin-left: 2px;
  opacity: 0.5;
  transition: transform 0.18s;
}
.topbar .nav-group:hover .nav-cat,
.topbar .nav-group:focus-within .nav-cat {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}
.topbar .nav-group:hover .nav-cat .caret,
.topbar .nav-group:focus-within .nav-cat .caret {
  transform: rotate(180deg);
  opacity: 1;
}
.topbar .nav-group.active .nav-cat {
  background: rgba(var(--jade-rgb), 0.15);
  color: var(--jade);
  box-shadow: inset 0 0 0 1px rgba(var(--jade-rgb), 0.3);
}

/* dropdown — display:none when hidden, sits flush against topbar bottom (no bridge needed) */
.topbar .nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  margin-top: 6px;
  transform: translateX(-50%);
  background: rgba(20, 20, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 6px;
  min-width: 240px;
  box-shadow: 0 14px 40px rgba(0,0,0,0.6), 0 2px 6px rgba(0,0,0,0.4);
  z-index: 100;
  animation: dropdownIn 0.16s ease-out;
}
/* nav-group itself extends its hover area downwards so mouse traverse to dropdown doesn't lose hover */
.topbar .nav-group {
  position: relative;
  padding-bottom: 8px;
  margin-bottom: -8px;
}
.topbar .nav-group:hover .nav-dropdown,
.topbar .nav-group:focus-within .nav-dropdown {
  display: block;
}
@keyframes dropdownIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-6px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.topbar .nav-dropdown a {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--text-soft);
  transition: background 0.12s, color 0.12s;
}
.topbar .nav-dropdown a:hover {
  background: rgba(var(--jade-rgb), 0.12);
  color: var(--text);
}
.topbar .nav-dropdown a.active {
  background: rgba(var(--jade-rgb), 0.2);
  color: var(--jade);
}
.topbar .nav-dropdown a .dd-en {
  font-size: 10px;
  font-family: ui-monospace, Consolas, monospace;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.topbar .meta {
  color: var(--muted);
  font-size: 11px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

/* =========================================================================
   Tool page layout — sidebar + main
   ========================================================================= */
.tool-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 340px 1fr;
  width: min(1400px, calc(100% - 36px));
  margin: 0 auto 24px;
  gap: 18px;
  min-height: calc(100vh - 120px);
}
.sidebar {
  background: rgba(20, 20, 26, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.main {
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}

/* =========================================================================
   Typography
   ========================================================================= */
h1 {
  font-size: 18px;
  margin: 0 0 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-family: "Space Grotesk", sans-serif;
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

/* standalone "返回全部工具" pill — sits LEFT of the main topbar in tool pages */
.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text);
  padding: 12px 20px;
  background: rgba(200, 210, 205, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-family: "Space Grotesk", "Inter", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.18s, border-color 0.18s, color 0.18s, transform 0.18s;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(0, 0, 0, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.18),
    0 1px 2px rgba(0, 0, 0, 0.12);
  height: 48px;
  box-sizing: border-box;
  letter-spacing: 0.02em;
}
.topbar-back:hover {
  background: rgba(var(--jade-rgb), 0.14);
  border-color: rgba(var(--jade-rgb), 0.4);
  color: var(--jade);
  transform: translateX(-2px);
}
.topbar-back .arr {
  font-size: 16px;
  line-height: 1;
  font-weight: 700;
}
h1 .h1-sub {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--muted);
  font-family: "Space Grotesk", sans-serif;
  text-transform: uppercase;
}
h2 {
  font-size: 11px;
  text-transform: uppercase;
  color: var(--muted);
  margin: 16px 0 8px;
  letter-spacing: 0.12em;
  font-weight: 600;
}
h2:first-child { margin-top: 0; }

/* =========================================================================
   Drop zone — glassmorphism with green accent on hover
   ========================================================================= */
.drop-zone {
  border: 1.5px dashed rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.18s ease;
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.02);
}
.drop-zone:hover,
.drop-zone.dragging {
  border-color: var(--jade);
  background: rgba(var(--jade-rgb), 0.06);
  box-shadow:
    0 0 0 1px rgba(var(--jade-rgb), 0.2),
    0 0 24px rgba(var(--jade-rgb), 0.15);
}
.drop-zone p { margin: 4px 0; }
.drop-zone .hint {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

/* =========================================================================
   Form controls
   ========================================================================= */
.field { margin-bottom: 10px; }
.field label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.04em;
}
.field input[type=number],
.field input[type=text],
.field input[type=range],
.field select,
.field textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.4);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font: inherit;
  font-family: "Space Grotesk", sans-serif;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--jade);
  box-shadow: 0 0 0 3px rgba(var(--jade-rgb), 0.15);
}
.field input[type=range] {
  appearance: none;
  -webkit-appearance: none;
  height: 4px;
  padding: 0;
  background: rgba(255, 255, 255, 0.08);
  border: 0;
  border-radius: 2px;
}
.field input[type=range]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--jade);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(var(--jade-rgb), 0.6);
}
.field input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--jade);
  cursor: pointer;
  border: 0;
  box-shadow: 0 0 8px rgba(var(--jade-rgb), 0.6);
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-soft);
}
.checkbox input { margin: 0; accent-color: var(--jade); }

/* =========================================================================
   Buttons
   ========================================================================= */
button, .btn {
  background: linear-gradient(180deg, var(--jade), #28d987);
  color: #0a1a14;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font: inherit;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 2px 8px rgba(var(--jade-rgb), 0.25);
}
button:hover, .btn:hover {
  background: linear-gradient(180deg, #67ffbc, #31f59c);
  box-shadow: 0 4px 16px rgba(var(--jade-rgb), 0.4);
  transform: translateY(-1px);
}
button:active, .btn:active { transform: translateY(0); }
button:disabled {
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}
button.secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-strong);
  color: var(--text);
  box-shadow: none;
}
button.secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--jade);
  color: var(--jade);
  transform: none;
}
button.danger { background: linear-gradient(180deg, var(--danger), #c84444); color: #fff; }
button.danger:hover { background: linear-gradient(180deg, #ff7575, var(--danger)); }

/* =========================================================================
   Stats / status panels
   ========================================================================= */
.stats {
  background: rgba(20, 20, 26, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-soft);
  border: 1px solid var(--border);
  font-family: "Space Grotesk", sans-serif;
}
.stats strong { color: var(--text); font-weight: 600; }

/* =========================================================================
   Preview area (image / canvas display)
   ========================================================================= */
.preview-area {
  flex: 1;
  background: var(--checker), #0a0a0c;
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
  padding: 16px;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.preview-area canvas, .preview-area img {
  max-width: 100%;
  image-rendering: pixelated;
}
.preview-empty { color: var(--muted); font-size: 12px; }

/* =========================================================================
   Frame grid
   ========================================================================= */
.frame-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 4px;
}
.frame-tile {
  background: var(--checker), #0a0a0c;
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  transition: border-color 0.15s, transform 0.15s;
}
.frame-tile:hover {
  border-color: rgba(var(--jade-rgb), 0.5);
  transform: scale(1.04);
}
.frame-tile canvas, .frame-tile img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  image-rendering: pixelated;
}
.frame-tile .idx {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.75);
  font-size: 9px;
  text-align: center;
  padding: 2px;
  font-family: ui-monospace, Consolas, monospace;
  color: var(--muted-2);
}

/* =========================================================================
   Log panel
   ========================================================================= */
.log {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 11px;
  max-height: 120px;
  overflow-y: auto;
  margin-top: 10px;
  color: var(--text-soft);
}
.log:empty { display: none; }
.log-line { margin: 2px 0; white-space: pre-wrap; }
.log-line.err { color: var(--danger); }
.log-line.ok { color: var(--jade); }
.log-line.warn { color: var(--warning); }
.log-line.dim { color: var(--muted); }

/* =========================================================================
   Progress bar
   ========================================================================= */
.progress {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
  display: none;
}
.progress.show { display: block; }
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--jade), #67ffbc);
  width: 0%;
  transition: width 0.1s;
  box-shadow: 0 0 8px rgba(var(--jade-rgb), 0.5);
}

/* sidebar full-width buttons */
.sidebar > button { width: 100%; }
.sidebar > button + button { margin-top: 6px; }

/* =========================================================================
   Inline instructions block (auto-injected via Toolkit.injectInstructions)
   ========================================================================= */
.instructions {
  background: rgba(var(--jade-rgb), 0.05);
  border: 1px solid rgba(var(--jade-rgb), 0.18);
  border-left: 3px solid var(--jade);
  border-radius: var(--radius-sm);
  padding: 8px 12px 10px;
  margin: 0 0 14px;
  font-size: 12px;
  color: var(--text-soft);
  line-height: 1.55;
}
.instructions > summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--jade);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.instructions > summary::-webkit-details-marker { display: none; }
.instructions > summary::after {
  content: "▾";
  font-size: 10px;
  color: var(--muted);
  transition: transform 0.18s;
}
.instructions[open] > summary::after {
  transform: rotate(180deg);
}
.instructions ol {
  margin: 8px 0 0;
  padding-left: 22px;
  counter-reset: instructions-counter;
  list-style: none;
}
.instructions ol li {
  position: relative;
  margin-bottom: 4px;
  counter-increment: instructions-counter;
}
.instructions ol li::before {
  content: counter(instructions-counter);
  position: absolute;
  left: -22px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(var(--jade-rgb), 0.15);
  color: var(--jade);
  font-size: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: ui-monospace, Consolas, monospace;
}
.instructions-note {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 11px;
  color: var(--muted);
}
.instructions-note strong { color: var(--text-soft); }

/* =========================================================================
   Eye dropper (color picker) — auto-attached to any hex color input
   ========================================================================= */
.eyedropper-wrap {
  display: flex;
  align-items: stretch;
  gap: 4px;
  width: 100%;
}
.eyedropper-wrap > input {
  flex: 1;
  min-width: 0;
}
.eyedropper-swatch {
  width: 28px;
  flex-shrink: 0;
  padding: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--checker), #0a0a0c;
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s;
}
.eyedropper-swatch:hover {
  border-color: rgba(var(--jade-rgb), 0.6);
  transform: scale(1.05);
}
.eyedropper-btn {
  flex-shrink: 0;
  width: 32px;
  padding: 0;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
  box-shadow: none;
  line-height: 1;
}
.eyedropper-btn:hover {
  background: rgba(var(--jade-rgb), 0.12);
  border-color: rgba(var(--jade-rgb), 0.4);
  transform: none;
}

/* =========================================================================
   HSV color picker popup (opened by clicking swatch)
   ========================================================================= */
.color-picker-pop {
  position: fixed;
  z-index: 9999;
  width: 220px;
  padding: 12px;
  background: var(--panel-solid);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(var(--jade-rgb), 0.15);
  display: flex;
  flex-direction: column;
  gap: 10px;
  user-select: none;
  animation: cp-pop-in 0.12s ease-out;
}
@keyframes cp-pop-in {
  from { opacity: 0; transform: translateY(-4px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
.cp-sv {
  position: relative;
  width: 196px;
  height: 140px;
  border-radius: var(--radius-sm);
  cursor: crosshair;
  overflow: hidden;
  border: 1px solid var(--border);
}
.cp-sv-marker {
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), 0 1px 3px rgba(0, 0, 0, 0.5);
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.cp-hue {
  position: relative;
  width: 196px;
  height: 14px;
  border-radius: 7px;
  cursor: ew-resize;
  border: 1px solid var(--border);
  background: linear-gradient(to right,
    hsl(0, 100%, 50%), hsl(60, 100%, 50%), hsl(120, 100%, 50%),
    hsl(180, 100%, 50%), hsl(240, 100%, 50%), hsl(300, 100%, 50%), hsl(360, 100%, 50%));
}
.cp-hue-marker {
  position: absolute;
  top: 50%;
  width: 6px;
  height: 20px;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.5);
  border-radius: 3px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}
.color-picker-pop .cp-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.color-picker-pop .cp-preview {
  width: 36px;
  height: 28px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--checker), #0a0a0c;
  background-size: 8px 8px;
}
.color-picker-pop .cp-hex {
  flex: 1;
  height: 28px;
  font-family: "Space Grotesk", monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
}
.color-picker-pop .cp-hex:focus {
  border-color: rgba(var(--jade-rgb), 0.5);
}
.color-picker-pop .cp-rgb {
  display: flex;
  gap: 6px;
}
.color-picker-pop .cp-rgb label {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 10px;
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.08em;
}
.color-picker-pop .cp-rgb input {
  width: 100%;
  height: 26px;
  font-family: "Space Grotesk", monospace;
  font-size: 12px;
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
  padding: 0 2px;
  -moz-appearance: textfield;
}
.color-picker-pop .cp-rgb input::-webkit-outer-spin-button,
.color-picker-pop .cp-rgb input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.color-picker-pop .cp-rgb input:focus {
  border-color: rgba(var(--jade-rgb), 0.5);
}

/* =========================================================================
   Cross-tool handoff dropdown
   ========================================================================= */
.handoff-wrap {
  position: relative;
  margin-top: 10px;
}
.handoff-btn {
  width: 100%;
  padding: 8px 12px;
  background: rgba(var(--jade-rgb), 0.08);
  border: 1px solid rgba(var(--jade-rgb), 0.3);
  color: var(--jade);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
  box-shadow: none;
}
.handoff-btn:hover:not(:disabled) {
  background: rgba(var(--jade-rgb), 0.16);
  transform: translateY(-1px);
}
.handoff-btn:disabled {
  background: rgba(255,255,255,0.04);
  border-color: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}
.handoff-menu {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0; right: 0;
  background: rgba(20, 20, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 6px;
  box-shadow: 0 14px 40px rgba(0,0,0,0.6), 0 2px 6px rgba(0,0,0,0.4);
  z-index: 100;
  display: none;
  max-height: 260px;
  overflow-y: auto;
}
.handoff-menu.open { display: block; }
.handoff-item {
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 7px 10px;
  border-radius: 5px;
  font-size: 12px;
  color: var(--text-soft);
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}
.handoff-item:hover {
  background: rgba(var(--jade-rgb), 0.12);
  color: var(--text);
}
.handoff-item .en {
  font-size: 10px;
  font-family: ui-monospace, Consolas, monospace;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* utility */
.row { display: flex; align-items: center; gap: 8px; }
.spacer { flex: 1; }
.muted { color: var(--muted); }
.small { font-size: 11px; }
.mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }

/* =========================================================================
   Shared mini-components (extracted from per-tool inline styles)
   ========================================================================= */

/* compat note callout (浏览器兼容提示) */
.compat-note {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--warning);
  padding: 8px 12px;
  font-size: 11px;
  color: var(--muted-2);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  line-height: 1.5;
}
.compat-note strong { color: var(--warning); }

/* generic info hint */
.info {
  font-size: 11px;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.55;
}

/* tab bar (pill-style segmented selector) */
.tab-row {
  display: flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-bottom: 12px;
}
.tab-row button {
  flex: 1;
  background: transparent;
  color: var(--text-soft);
  padding: 6px 0;
  font-size: 12px;
  border-radius: calc(var(--radius-sm) - 3px);
  box-shadow: none;
  font-weight: 500;
}
.tab-row button.active {
  background: var(--jade);
  color: #0a1a14;
  box-shadow: 0 0 12px rgba(var(--jade-rgb), 0.4);
}
.tab-row button:hover { transform: none; background: rgba(255,255,255,0.04); color: var(--text); }
.tab-row button.active:hover { background: var(--jade); color: #0a1a14; }

/* before/after compare slider */
.compare-slider {
  position: relative;
  display: inline-block;
  max-width: 100%;
  user-select: none;
}
.compare-slider .frame {
  display: block;
  background: var(--checker), #0a0a0c;
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.compare-slider .frame > * {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: contain;
}
.compare-slider .frame > .top {
  clip-path: inset(0 50% 0 0);
}
.compare-slider .handle {
  position: absolute;
  top: 0; bottom: 0;
  width: 3px;
  background: var(--jade);
  left: 50%;
  transform: translateX(-50%);
  cursor: ew-resize;
  z-index: 10;
  box-shadow: 0 0 12px rgba(var(--jade-rgb), 0.6);
}
.compare-slider .handle::before {
  content: "↔";
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 32px; height: 32px;
  background: var(--jade);
  color: #0a1a14;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}
.compare-slider .label {
  position: absolute;
  top: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: ui-monospace, Consolas, monospace;
  z-index: 5;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  backdrop-filter: blur(4px);
}
.compare-slider .label.left { left: 12px; }
.compare-slider .label.right { right: 12px; }

/* responsive: narrow viewport falls back to single column */
@media (max-width: 900px) {
  .tool-layout {
    grid-template-columns: 1fr;
    width: calc(100% - 24px);
  }
  .topbar { padding: 10px 14px; gap: 10px; flex-wrap: nowrap; border-radius: 18px; }
  .topbar nav { gap: 2px; }
  .topbar .meta { display: none; }
}
@media (max-width: 640px) {
  .topbar .brand span:last-child { display: none; }
}