:root,
[data-theme="dark"] {
  --bg:              #0f0f0f;
  --bg-alt:          #1c1c1c;
  --surface:         rgba(10, 14, 27, 0.85);
  --card-bg:         rgba(12, 16, 20, 0.92);
  --card-border:     rgba(120, 200, 180, 0.15);

  --text:            #ffffff;
  --text-muted:      rgba(255, 255, 255, 0.5);
  --text-soft:       rgba(255, 255, 255, 0.75);

  --accent:          rgba(120, 200, 180, 1);
  --accent-dim:      rgba(30, 90, 80, 0.9);
  --accent-border:   rgba(30, 90, 80, 0.3);
  --accent-hover:    rgba(40, 120, 100, 1);
  --accent-glow:     rgba(120, 200, 180, 0.3);

  --skill-bg:        rgba(10, 20, 18, 0.6);
  --scrollbar-track: rgba(255, 255, 255, 0.05);
  --scrollbar-thumb: rgba(255, 255, 255, 0.2);
  --scrollbar-hover: rgba(255, 255, 255, 0.3);
  --nav-border:      rgba(30, 90, 80, 0.2);

  --ripple-color:    #f0ecf8;

  --font-display:       'Syne', system-ui, sans-serif;
  --font-style-display: normal;
  --font-body:          'Inter', 'Space Grotesk', system-ui, sans-serif;
}

[data-theme="light"] {
  --bg:              #f0ecf8;
  --bg-alt:          #e8e3f3;
  --surface:         rgba(200, 190, 225, 0.45);
  --card-bg:         rgba(195, 182, 220, 0.5);
  --card-border:     rgba(74, 58, 122, 0.12);

  --text:            #1a1a1f;
  --text-muted:      rgba(26, 26, 31, 0.5);
  --text-soft:       rgba(26, 26, 31, 0.72);

  --accent:          #4a3a7a;
  --accent-dim:      rgba(74, 58, 122, 0.85);
  --accent-border:   rgba(74, 58, 122, 0.15);
  --accent-hover:    #5c4a94;
  --accent-glow:     rgba(74, 58, 122, 0.18);

  --skill-bg:        rgba(74, 58, 122, 0.07);
  --scrollbar-track: rgba(26, 26, 31, 0.04);
  --scrollbar-thumb: rgba(26, 26, 31, 0.14);
  --scrollbar-hover: rgba(26, 26, 31, 0.28);
  --nav-border:      rgba(74, 58, 122, 0.12);

  --ripple-color:    #0f0f0f;

  --font-display:       'Cormorant Garamond', Georgia, serif;
  --font-style-display: italic;
  --font-body:          'Inter', 'Space Grotesk', system-ui, sans-serif;
}

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

html {
  scroll-behavior: auto;
  transition: background-color 0.4s ease, color 0.4s ease;
}

html, body {
  width: 100%;
  min-height: 100%;
  overflow-x: hidden;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track  { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb  { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

#webGLApp {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  will-change: transform;
  background: #0a0e27;
}
[data-theme="light"] #webGLApp { background: #f0ecf8; }
#webGLApp canvas {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.theme-ripple {
  position: fixed;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  z-index: 9998;
  pointer-events: none;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              opacity   0.1s linear;
  will-change: transform;
}
.theme-ripple.expanding {
  transform: translate(-50%, -50%) scale(var(--ripple-scale, 100));
}

.page-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: max-content;
  max-width: calc(100vw - 2rem);
  animation: floatIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

@keyframes floatIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.6rem 1.25rem;
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--nav-border);
  border-radius: 100px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
  transition: background 0.4s ease, border-color 0.4s ease;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-mark {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: background 0.2s ease;
}
.logo:hover .logo-mark { background: var(--accent-border); }
.logo-text {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav-divider {
  width: 1px;
  height: 22px;
  background: linear-gradient(to bottom, transparent, var(--accent-border), transparent);
  flex-shrink: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--skill-bg);
  border: 1px solid var(--accent-border);
  color: var(--accent);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  flex-shrink: 0;
  position: relative;
}
.nav-icon-btn:hover {
  background: var(--accent-border);
  border-color: var(--accent-dim);
  color: var(--accent-hover);
  transform: scale(1.1) translateY(-2px);
}

.t-icon {
  position: absolute;
  transition: opacity 0.22s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
[data-theme="dark"]  .t-icon.sun  { opacity: 1; transform: scale(1);   }
[data-theme="dark"]  .t-icon.moon { opacity: 0; transform: scale(0.5); }
[data-theme="light"] .t-icon.sun  { opacity: 0; transform: scale(0.5); }
[data-theme="light"] .t-icon.moon { opacity: 1; transform: scale(1);   }

.main-content {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  padding: 108px 28px 88px;
}

@keyframes heroIn {
  from { opacity: 0; transform: translateY(20px); filter: blur(6px); }
  to   { opacity: 1; transform: translateY(0);    filter: blur(0); }
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(28px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0);    filter: blur(0); }
}

.intro {
  text-align: center;
  margin-bottom: 48px;
  animation: heroIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

.intro-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  opacity: 0.8;
}
.intro-eyebrow::before,
.intro-eyebrow::after {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--accent-border);
}

.intro h1 {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 6.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
  line-height: 0.95;
  margin-bottom: 20px;
}
[data-theme="light"] .intro h1 { font-style: italic; }

.intro h1 .accent-char {
  color: var(--accent);
  display: inline-block;
}

.intro p {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 340px;
  margin: 0 auto;
  line-height: 1.7;
}

.upload-pair-wrap {
  text-align: center;
  margin-bottom: 16px;
  animation: heroIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
}
.upload-pair-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.55rem 1.4rem;
  border-radius: 100px;
  border: 1px solid var(--accent-border);
  background: var(--accent-glow);
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}
.upload-pair-btn:hover {
  background: var(--accent-border);
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.upload-card {
  position: relative;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s cubic-bezier(0.22,1,0.36,1), box-shadow 0.3s ease;
  animation: cardIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}
#upload-left  { animation-delay: 0.35s; }
#upload-right { animation-delay: 0.45s; }

.upload-card::before {
  content: attr(data-label);
  position: absolute;
  bottom: -0.1em;
  right: 0.1em;
  font-family: var(--font-display);
  font-size: clamp(7rem, 14vw, 11rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--accent);
  opacity: 0.04;
  pointer-events: none;
  user-select: none;
  transition: opacity 0.3s ease;
}
.upload-card:hover::before,
.upload-card.drag-over::before { opacity: 0.08; }
.upload-card.has-file::before  { opacity: 0.06; }

.upload-card:hover,
.upload-card.drag-over {
  border-color: var(--accent-border);
  background: rgba(120, 200, 180, 0.04);
  transform: translateY(-3px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.25), 0 0 0 1px var(--accent-border);
}
[data-theme="light"] .upload-card:hover,
[data-theme="light"] .upload-card.drag-over {
  background: rgba(74, 58, 122, 0.04);
  box-shadow: 0 20px 60px rgba(74,58,122,0.1), 0 0 0 1px var(--accent-border);
}
.upload-card.has-file {
  border-color: var(--accent-border);
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 52px 32px 48px;
  min-height: 200px;
  cursor: pointer;
  text-align: center;
}
.file-input-hidden {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.dropzone-icon {
  width: 48px; height: 48px;
  border-radius: 14px;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: background 0.25s ease, transform 0.3s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.25s ease;
  pointer-events: none;
}
.upload-card:hover .dropzone-icon,
.upload-card.drag-over .dropzone-icon {
  background: var(--accent-border);
  transform: scale(1.12) translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.dropzone-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
  pointer-events: none;
}
.dropzone-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  pointer-events: none;
  line-height: 1.6;
}

.file-badge {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-top: 1px solid var(--card-border);
  font-size: 0.76rem;
  color: var(--text-soft);
  background: rgba(0,0,0,0.12);
  position: relative;
  z-index: 2;
}
.upload-card.has-file .file-badge { display: flex; }
.badge-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--accent); }
.badge-size { color: var(--text-muted); flex-shrink: 0; }

.comparison-section { display: none; }
.comparison-section.visible { display: block; }

/* macOS window chrome */
.window-chrome {
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(24px) saturate(1.3);
  -webkit-backdrop-filter: blur(24px) saturate(1.3);
  overflow: hidden;
  box-shadow:
    0 40px 100px rgba(0,0,0,0.45),
    0 8px 24px rgba(0,0,0,0.22),
    inset 0 1px 0 rgba(255,255,255,0.05);
  animation: cardIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.15s both;
}

.window-titlebar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--card-border);
  background: rgba(255,255,255,0.02);
  user-select: none;
}
.win-dots { display: flex; gap: 6px; }
.win-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  transition: filter 0.15s ease;
  cursor: default;
}
.win-dot.close { background: #ff5f57; }
.win-dot.min   { background: #ffbd2e; }
.win-dot.max   { background: #28c840; }
.win-dot:hover { filter: brightness(1.15); }

.win-title {
  flex: 1;
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.025em;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--card-border);
  background: rgba(255,255,255,0.01);
}

.panel-info {
  display: flex;
  flex-direction: column;
  min-width: 110px;
}
.panel-info-name {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.panel-info-dim {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 1px;
  font-variant-numeric: tabular-nums;
}

.zoom-group {
  display: flex;
  align-items: center;
  gap: 3px;
}
.zoom-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  min-width: 26px;
  padding: 0 7px;
  border-radius: 7px;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text-soft);
  font-size: 0.74rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  font-family: var(--font-body);
  line-height: 1;
}
.zoom-btn:hover { color: var(--accent); background: var(--accent-glow); border-color: var(--accent-border); }
.zoom-val {
  min-width: 40px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.toolbar-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.slider-label {
  font-size: 0.62rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  user-select: none;
}
.split-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 180px;
  height: 4px;
  border-radius: 2px;
  background: var(--card-border);
  outline: none;
  cursor: pointer;
}
.split-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1.5px var(--accent-border), 0 2px 6px rgba(0,0,0,0.3);
  cursor: grab;
  transition: transform 0.15s ease;
}
.split-slider::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.2); }
.split-slider::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: grab;
}

.sync-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 7px 14px;
  border-bottom: 1px solid var(--card-border);
  background: rgba(0,0,0,0.06);
}

.sync-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0 12px;
  height: 26px;
  font-size: 0.72rem;
}

.sync-toggle.locked {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent-border);
}
.sync-toggle.locked svg { stroke: var(--accent); }

.viewer {
  position: relative;
  width: 100%;
  height: 560px;
  overflow: hidden;
  background: #0a0a0a;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  -webkit-touch-callout: none;
  cursor: grab;
}
.viewer:active { cursor: grabbing; }
[data-theme="light"] .viewer { background: #e0d8f0; }

.panel-left {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.panel-right {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.img-wrapper {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
  will-change: transform;
  touch-action: none;
  pointer-events: none;
  user-select: none;
}

.img-wrapper img {
  display: block;
  max-width: none;
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
  image-rendering: auto;
}

.divider-line {
  position: absolute;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 20;
  will-change: left;
}

.divider-handle {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 20px var(--accent-glow), 0 2px 10px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  pointer-events: none;
  user-select: none;
  z-index: 21;
}

.divider-hit {
  position: absolute;
  top: 0; bottom: 0;
  width: 48px;
  transform: translateX(-50%);
  cursor: ew-resize;
  z-index: 22;
  touch-action: none;
}

.panel-tag {
  position: absolute;
  top: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0,0,0,0.52);
  backdrop-filter: blur(8px);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.78);
  border: 1px solid rgba(255,255,255,0.08);
  pointer-events: none;
  user-select: none;
  z-index: 10;
}
.tag-left  { left: 12px; }
.tag-right { right: 12px; }

.viewer-hint {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  pointer-events: none;
  user-select: none;
  transition: opacity 0.3s ease;
}
.viewer-hint.hidden { opacity: 0; }

.status-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  padding: 10px 20px;
  border-radius: 10px;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  font-size: 0.78rem;
  color: var(--text-soft);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  z-index: 9000;
  transition: opacity 0.25s ease, transform 0.25s ease;
  white-space: nowrap;
}
.status-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

footer {
  border-top: 1px solid var(--nav-border);
  text-align: center;
  padding: 20px 24px;
  font-size: 0.73rem;
  color: rgba(255,255,255,0.45);
  animation: introIn 0.7s cubic-bezier(0.16,1,0.3,1) 1s both;
}
[data-theme="light"] footer { color: rgba(26,26,31,0.45); }
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { color: var(--accent-hover); }
.version { opacity: 0.5; }

@keyframes introIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 680px) {
  .site-header { top: 1rem; left: 1rem; right: 1rem; transform: none; }
  .upload-grid { grid-template-columns: 1fr; }
  .viewer { height: 360px; }
  .split-slider { width: 110px; }
  .panel-info { min-width: 80px; }
  .main-content { padding: 80px 16px 64px; }
  .header-inner { gap: 1rem; padding: 0.5rem 1rem; }
  .logo-text { display: none; }
  .toolbar { flex-wrap: wrap; gap: 6px; }
}

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