/*
  Palette - modern UI stylesheet
  Provides polished visuals for upload + editor experience in both light and dark mode.
*/

:root {
  --font-sans: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --color-bg: #f5f7fb;
  --color-text: #1f2433;
  --color-muted: #6b7280;
  --color-border: rgba(17, 24, 39, 0.12);
  --color-surface: rgba(255, 255, 255, 0.92);
  --color-surface-alt: rgba(255, 255, 255, 0.75);
  --color-input-bg: rgba(255, 255, 255, 0.82);
  --color-primary: #6c63ff;
  --color-primary-light: rgba(108, 99, 255, 0.18);
  --color-contrast: #ffffff;
  --color-orb-1: rgba(120, 136, 255, 0.32);
  --color-orb-2: rgba(255, 163, 163, 0.28);
  --color-orb-3: rgba(111, 255, 214, 0.25);
  --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 16px 40px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 24px 52px rgba(15, 23, 42, 0.16);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-pill: 999px;
  --transition-fast: 120ms ease;
  --transition-slow: 260ms ease;
}

body.dark-mode {
  --color-bg: #0f172a;
  --color-text: #f8fafc;
  --color-muted: rgba(226, 232, 240, 0.7);
  --color-border: rgba(148, 163, 184, 0.18);
  --color-surface: rgba(15, 23, 42, 0.78);
  --color-surface-alt: rgba(15, 23, 42, 0.6);
  --color-input-bg: rgba(15, 23, 42, 0.68);
  --color-primary: #8b7bff;
  --color-primary-light: rgba(139, 123, 255, 0.18);
  --color-orb-1: rgba(139, 123, 255, 0.42);
  --color-orb-2: rgba(255, 115, 115, 0.28);
  --color-orb-3: rgba(72, 255, 214, 0.28);
  --shadow-sm: 0 12px 32px rgba(2, 6, 23, 0.45);
  --shadow-md: 0 18px 44px rgba(2, 6, 23, 0.55);
  --shadow-lg: 0 28px 60px rgba(2, 6, 23, 0.6);
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--color-primary-light);
  color: var(--color-contrast);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding: 18px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 18px;
  z-index: 5;
}

.site-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.site-nav-links {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 auto;
  flex-wrap: wrap;
}

.site-nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-nav-links a:hover,
.site-nav-links a:focus-visible {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.site-main {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.section-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: 48px 40px;
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.section-header h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.section-header p {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-muted);
  max-width: 720px;
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 64px 40px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(108, 99, 255, 0.18), transparent 60%), radial-gradient(circle at 80% 10%, rgba(255, 163, 163, 0.14), transparent 58%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-content h1 {
  margin: 0;
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.hero-content p {
  margin: 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-muted);
  max-width: 760px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.btn.hero-primary {
  background: linear-gradient(135deg, var(--color-primary), #8b7bff);
  color: var(--color-contrast);
  border-color: transparent;
  box-shadow: 0 18px 36px rgba(108, 99, 255, 0.28);
}

.btn.hero-primary:hover {
  color: var(--color-contrast);
  background: linear-gradient(135deg, var(--color-primary), #8b7bff);
  box-shadow: 0 24px 46px rgba(108, 99, 255, 0.36);
}

.hero-subtext {
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-highlights li {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.5;
}

.feature-grid-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-card h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.solution-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.solution-card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.solution-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

.keywords-wrapper {
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border);
  padding: 24px;
  background: var(--color-surface-alt);
}

.keyword-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  line-height: 1.5;
}

.faq-items {
  display: grid;
  gap: 16px;
}

.faq-items details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  padding: 16px 20px;
}

.faq-items summary {
  font-weight: 600;
  cursor: pointer;
  outline: none;
}

.faq-items p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

.privacy-content {
  display: flex;
  flex-direction: column;
  gap: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
}

.privacy-content h2 {
  margin: 24px 0 8px;
  font-size: 22px;
  font-weight: 700;
}

.privacy-content ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

.privacy-content a {
  color: var(--color-primary);
}

.app-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-workspace {
  align-items: stretch;
}

.editor-shell {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.site-footer {
  margin-top: 32px;
  padding: 32px 26px 48px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-brand p {
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
  max-width: 320px;
}

.footer-contact {
  margin: 0;
  font-size: 13px;
}

.footer-contact a {
  color: var(--color-primary);
}

.footer-meta {
  margin: 0;
  font-size: 12px;
  color: var(--color-muted);
}

.app-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.app-backdrop .orb {
  position: absolute;
  border-radius: 50%;
  opacity: 0.85;
  will-change: transform;
}

.app-backdrop .orb-1 {
  width: 540px;
  height: 540px;
  top: -240px;
  right: -140px;
  background: radial-gradient(circle at 30% 30%, var(--color-orb-1) 0%, transparent 70%);
  animation: orbFloat 22s ease-in-out infinite;
}

.app-backdrop .orb-2 {
  width: 440px;
  height: 440px;
  left: -160px;
  bottom: -220px;
  background: radial-gradient(circle at 65% 30%, var(--color-orb-2) 0%, transparent 72%);
  animation: orbFloat 28s ease-in-out infinite reverse;
}

.app-backdrop .orb-3 {
  width: 520px;
  height: 520px;
  top: 28%;
  left: 48%;
  background: radial-gradient(circle at 50% 50%, var(--color-orb-3) 0%, transparent 76%);
  animation: orbFloat 30s ease-in-out infinite;
}

@keyframes orbFloat {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(16px, -22px, 0) scale(1.06);
  }
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 32px 0 56px;
}

.panel-export {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  margin-left: auto;
}

.panel-export-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.panel-export-control {
  position: relative;
  display: inline-flex;
}

.panel-export-control::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 16px;
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-60%) rotate(45deg);
  pointer-events: none;
  opacity: 0.7;
}

.panel-export-select {
  appearance: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 8px 42px 8px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
  min-width: 180px;
}

.panel-export-select:hover {
  border-color: rgba(108, 99, 255, 0.35);
  background: var(--color-primary-light);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.panel-export-select:focus-visible {
  outline: 2px solid rgba(108, 99, 255, 0.6);
  outline-offset: 2px;
}

.panel-export-select:disabled {
  opacity: 0.6;
  box-shadow: none;
  background: var(--color-input-bg);
  color: var(--color-muted);
  cursor: not-allowed;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ctrl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.ctrl:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.ctrl:focus-visible {
  outline: 2px solid rgba(108, 99, 255, 0.6);
  outline-offset: 3px;
}

.add-mask-action {
  color: var(--color-primary);
  background: rgba(108, 99, 255, 0.12);
  border-color: rgba(108, 99, 255, 0.35);
  box-shadow: 0 10px 20px rgba(108, 99, 255, 0.12);
}

.add-mask-action:hover {
  transform: translateY(-1px);
  background: rgba(108, 99, 255, 0.18);
  border-color: rgba(108, 99, 255, 0.55);
  box-shadow: 0 14px 26px rgba(108, 99, 255, 0.18);
}

.add-mask-action:focus-visible {
  outline: 2px solid rgba(108, 99, 255, 0.6);
  outline-offset: 3px;
}

.ctrl-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(108, 99, 255, 0.18);
  color: inherit;
  font-size: 16px;
}

.ctrl-label {
  display: inline-flex;
  align-items: center;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.toolbar-btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.35), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.toolbar-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  border-color: rgba(108, 99, 255, 0.30);
  background: var(--color-primary-light);
}

.toolbar-btn:hover::after {
  opacity: 1;
}

.toolbar-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.toolbar-btn[aria-pressed="true"] {
  border-color: var(--color-primary);
}

.language-picker {
  position: relative;
}

.language-picker select {
  appearance: none;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 7px 38px 7px 16px;
  font-size: 14px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.language-picker select:hover {
  border-color: rgba(108, 99, 255, 0.28);
  box-shadow: var(--shadow-md);
}

.language-picker select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.18);
}

.language-picker::after {
  content: "\25BE";
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--color-muted);
  font-size: 12px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: rgba(108, 99, 255, 0.30);
  box-shadow: var(--shadow-md);
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 32px;
  flex: 1 1 auto;
  padding: 0 0 56px;
}

.app-workspace {
  gap: 32px;
}

.upload-area {
  display: flex;
  justify-content: center;
  width: 100%;
}

.upload-card {
  width: min(520px, 100%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 48px 36px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-fast), background-color var(--transition-fast);
}

.upload-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 25% 25%, rgba(108, 99, 255, 0.18), transparent 55%);
  opacity: 0.7;
  pointer-events: none;
}

.upload-card-body {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
  z-index: 1;
}

.upload-card h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.upload-card p {
  margin: 0;
  max-width: 400px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.6;
}

.upload-area.dragging .upload-card {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.upload-area.dragging .preview {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-contrast);
}


.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: 14px 26px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.35), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(108, 99, 255, 0.35);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn:disabled {
  opacity: 0.65;
  box-shadow: none;
  transform: none;
  background: var(--color-input-bg);
  color: var(--color-muted);
}

.btn-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(108, 99, 255, 0.15);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  color: inherit;
}

.btn-icon::before {
  content: "";
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-left: 0;
  border-bottom: 0;
  transform: rotate(-45deg);
}

.btn-label {
  white-space: nowrap;
}

.preview {
  width: 100%;
  min-height: 160px;
  max-height: 360px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
  overflow: auto;
  color: var(--color-muted);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.preview img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
  box-shadow: var(--shadow-sm);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(108, 99, 255, 0.12);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
}

.empty-state {
  font-size: 14px;
  color: var(--color-muted);
  text-align: center;
  padding: 16px 0;
}

.divider {
  height: 1px;
  width: 100%;
  background: var(--color-border);
  margin: 8px 0;
}

.hidden {
  display: none !important;
}

.editor {
  display: flex;
  gap: 16px;
  width: 100%;
  align-items: stretch;
  justify-content: stretch;
  padding: 20px 8px;
  min-height: 0;
  flex: 1 1 auto;
  box-sizing: border-box;
  opacity: 0;
  transform: translateY(24px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.editor.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.editor-image {
  flex: 7 1 0%;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 16px 12px;
  min-height: 0;
  height: 100%;
  position: relative;
  touch-action: none;
  user-select: none;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 8px;
}

.editor-toolbar .meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-muted);
  font-size: 13px;
}

.editor-image-viewport {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.editor-image-viewport img {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(1);
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transform-origin: center center;
  display: block;
  touch-action: none;
}

.floating-hint {
  position: absolute;
  right: 16px;
  top: 16px;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-overlay);
  backdrop-filter: blur(10px);
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(-6px);
  animation: hintFade 6s ease 1s forwards;
}

@keyframes hintFade {
  0% {
    opacity: 0;
    transform: translateY(-6px);
  }
  15% {
    opacity: 1;
    transform: translateY(0);
  }
  85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-6px);
  }
}

.editor-panel {
  flex: 3 1 0%;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  max-height: calc(100vh - 200px);
  overflow: hidden;
}

.editor-panel-scroll {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-right: 6px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.panel-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: rgba(108, 99, 255, 0.06);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.control-group:hover {
  border-color: rgba(108, 99, 255, 0.25);
  background: rgba(108, 99, 255, 0.10);
}

.slider {
  flex: 1 1 auto;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: var(--color-input-bg);
  outline: none;
  transition: background-color var(--transition-fast);
}

.slider:active::-webkit-slider-thumb {
  transform: scale(1.08);
}
.mask-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px 0 0;
  border-top: 1px solid var(--color-border);
}

.mask-panel h3 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.mask-types {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mask-type-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.mask-type-btn:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.mask-type-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-button-text, #fff);
}

.mask-summary {
  margin-top: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--color-border);
}

.mask-summary-count {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.01em;
}

.mask-selected-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: linear-gradient(145deg, var(--color-surface), var(--color-surface-alt));
  box-shadow: var(--shadow-sm);
}

.mask-selected-card--locked {
  border-style: dashed;
  background: var(--color-surface-alt);
}

.mask-selected-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mask-selected-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.mask-selected-description {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-muted);
}

.mask-selected-badge {
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(148, 163, 184, 0.16);
  color: var(--color-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.mask-selected-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mask-selected-meta {
  font-size: 12px;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.mask-selected-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mask-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  background: var(--color-surface-alt);
  color: var(--color-text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.mask-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.mask-button:focus-visible {
  outline: 2px solid rgba(108, 99, 255, 0.6);
  outline-offset: 2px;
}

.mask-button--accent {
  background: var(--color-primary);
  color: var(--color-button-text, #fff);
  box-shadow: 0 10px 22px rgba(108, 99, 255, 0.18);
}

.mask-button--accent:hover {
  box-shadow: 0 14px 28px rgba(108, 99, 255, 0.24);
}

.mask-button--danger {
  background: rgba(255, 77, 79, 0.16);
  color: #ff4d4f;
  border-color: rgba(255, 77, 79, 0.32);
}

.mask-button--danger:hover {
  background: rgba(255, 77, 79, 0.22);
  box-shadow: 0 10px 24px rgba(255, 77, 79, 0.2);
}

.mask-adjustments-card {
  margin-top: 12px;
  padding: 16px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mask-adjustments-title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.mask-slider {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
}

.mask-slider + .mask-slider {
  margin-top: 6px;
}

.mask-slider-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-muted);
  min-width: 80px;
}

.mask-slider input[type="range"] {
  width: 100%;
  accent-color: var(--color-primary);
}

.mask-slider-value {
  min-width: 48px;
  text-align: right;
  font-size: 12px;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.mask-footer {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.curve-tabs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.curve-tablist {
  display: flex;
  gap: 8px;
  padding: 6px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
}

.curve-tab {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}

.curve-tab.is-active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(108, 99, 255, 0.25);
}

.curve-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: radial-gradient(circle at 16% 20%, rgba(108, 99, 255, 0.18), transparent 70%), var(--color-surface-alt);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.curve-canvas {
  display: none;
  width: min(100%, 320px);
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(108, 99, 255, 0.22);
  background: var(--color-surface);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04), var(--shadow-sm);
  touch-action: none;
  cursor: crosshair;
}

.curve-canvas.is-active {
  display: block;
}

.curve-tip {
  margin: 0;
  font-size: 11px;
  color: var(--color-muted);
  line-height: 1.5;
}

body.dark-mode .mask-selected-card {
  background: linear-gradient(145deg, rgba(38, 38, 58, 0.92), rgba(28, 28, 44, 0.92));
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .mask-selected-card--locked {
  background: rgba(28, 28, 44, 0.85);
}

body.dark-mode .mask-selected-badge {
  background: rgba(148, 163, 184, 0.24);
  color: rgba(226, 232, 240, 0.85);
}

body.dark-mode .mask-button {
  background: rgba(255, 255, 255, 0.04);
}

body.dark-mode .mask-button--danger {
  background: rgba(255, 99, 105, 0.22);
  border-color: rgba(255, 99, 105, 0.35);
  color: #ff7a7e;
}

body.dark-mode .curve-tablist {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.08);
}

body.dark-mode .curve-tab.is-active {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(108, 99, 255, 0.35);
}

body.dark-mode .curve-stage {
  border-color: rgba(255, 255, 255, 0.08);
  background: radial-gradient(circle at 16% 20%, rgba(108, 99, 255, 0.24), transparent 70%), var(--color-surface);
}

body.dark-mode .site-nav,
body.dark-mode .section-block,
body.dark-mode .site-footer {
  background: rgba(15, 23, 42, 0.82);
  border-color: rgba(148, 163, 184, 0.16);
}

body.dark-mode .feature-card,
body.dark-mode .solution-card,
body.dark-mode .keywords-wrapper,
body.dark-mode .faq-items details,
body.dark-mode .hero-highlights li {
  background: rgba(15, 23, 42, 0.72);
  border-color: rgba(148, 163, 184, 0.18);
}

body.dark-mode .section-header p,
body.dark-mode .hero-content p,
body.dark-mode .hero-subtext,
body.dark-mode .feature-card p,
body.dark-mode .solution-card p,
body.dark-mode .hero-highlights li,
body.dark-mode .privacy-content,
body.dark-mode .privacy-content ul {
  color: rgba(226, 232, 240, 0.78);
}

body.dark-mode .privacy-content a {
  color: var(--color-primary);
}

.mask-manager {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 0;
  max-height: 240px;
  overflow: auto;
}

.mask-manager-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.mask-manager-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.mask-manager-item.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.mask-manager-item.locked {
  border-style: dashed;
  opacity: 0.75;
  background: var(--color-surface);
}

.mask-manager-item.locked:hover {
  transform: none;
  box-shadow: none;
  background: var(--color-surface);
}

.mask-manager-empty {
  font-size: 12px;
  color: var(--color-muted);
  text-align: center;
  padding: 12px 0;
}

.mask-name {
  font-size: 13px;
  font-weight: 600;
}

.mask-badges {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-muted);
  font-size: 12px;
}

.mask-actions {
  display: inline-flex;
  gap: 6px;
}

.mask-action-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--color-muted);
  transition: border-color var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

.mask-action-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.zoom-control {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  background: var(--color-overlay);
  backdrop-filter: blur(6px);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  font-size: 14px;
  user-select: none;
  z-index: 80;
}

.zoom-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 20px;
  line-height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.zoom-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.zoom-btn:active {
  background: rgba(108, 99, 255, 0.18);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.12);
}

.zoom-percent {
  min-width: 60px;
  text-align: center;
  font-weight: 600;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.minimap {
  position: absolute;
  left: 12px;
  top: 12px;
  width: 160px;
  height: 110px;
  background: var(--color-minimap-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(12, 15, 30, 0.24);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 40;
}

.minimap img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  margin: auto;
  pointer-events: none;
}

.mini-viewport {
  position: absolute;
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 9999px rgba(76, 68, 216, 0.12) inset;
  border-radius: 2px;
  pointer-events: none;
  transition: border-color var(--transition-fast);
}

.mini-viewport:hover {
  border-color: var(--color-primary-dark);
}

.surface {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

body,
.editor-panel-scroll,
.mask-manager {
  scrollbar-width: thin;
  scrollbar-color: var(--color-scrollbar-thumb) var(--color-scrollbar-track);
}

body::-webkit-scrollbar,
.editor-panel-scroll::-webkit-scrollbar,
.mask-manager::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

body::-webkit-scrollbar-track,
.editor-panel-scroll::-webkit-scrollbar-track,
.mask-manager::-webkit-scrollbar-track {
  background: var(--color-scrollbar-track);
  border-radius: var(--radius-pill);
}

body::-webkit-scrollbar-thumb,
.editor-panel-scroll::-webkit-scrollbar-thumb,
.mask-manager::-webkit-scrollbar-thumb {
  background: var(--color-scrollbar-thumb);
  border-radius: var(--radius-pill);
}

@media (max-width: 1080px) {
  .app-shell {
    width: min(1040px, calc(100% - 32px));
  }

  .editor {
    flex-direction: column;
  }

  .editor-image,
  .editor-panel {
    flex: 1 1 auto;
    max-height: none;
  }

  .editor-panel {
    padding: 18px 14px;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 24px 0 48px;
  }

  .site-nav {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .site-nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .header-controls {
    margin-left: 0;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .section-block {
    padding: 36px 24px;
  }

  .header-controls {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .toolbar-btn,
  .language-picker select,
  .theme-toggle {
    font-size: 13px;
    padding: 7px 14px;
  }

  .upload-card {
    padding: 36px 24px;
  }

  .preview {
    padding: 22px;
    min-height: 140px;
  }

  .editor {
    padding: 12px 0;
  }

  .zoom-control {
    bottom: 10px;
    gap: 8px;
    padding: 6px 12px;
  }

  .zoom-btn {
    width: 28px;
    height: 28px;
    font-size: 18px;
  }

  .zoom-percent {
    font-size: 12px;
    min-width: 50px;
  }

  .minimap {
    width: 120px;
    height: 84px;
    left: 10px;
    top: 10px;
  }

  .panel-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .panel-export {
    width: 100%;
    justify-content: space-between;
    margin-left: 0;
  }

  .panel-export-label {
    font-size: 13px;
  }

  .panel-export-control {
    flex: 1 1 auto;
  }

  .panel-export-select {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .app-shell {
    width: calc(100% - 24px);
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-highlights {
    grid-template-columns: 1fr;
  }

  .upload-card {
    padding: 28px 18px;
  }

  .upload-card h2 {
    font-size: 20px;
  }

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

  .preview {
    padding: 18px;
  }

  .editor-panel {
    padding: 16px 12px;
  }
}

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