:root {
  color-scheme: dark;
  --bg: #07120f;
  --bg-2: #0d1c19;
  --surface: rgba(13, 28, 25, 0.88);
  --surface-strong: #102822;
  --ink: #eefcf5;
  --muted: #9fbab0;
  --line: rgba(127, 255, 210, 0.18);
  --accent: #40f2b0;
  --accent-2: #ffcc66;
  --danger: #ff6b70;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans CJK SC", "Noto Sans CJK TC", "Noto Sans JP", "Noto Sans KR", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(64, 242, 176, 0.14), transparent 28rem),
    radial-gradient(circle at 82% 0%, rgba(255, 204, 102, 0.08), transparent 26rem),
    linear-gradient(135deg, var(--bg), #081513 46%, #10130d);
  color: var(--ink);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(127, 255, 210, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 255, 210, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 78%);
}

a {
  color: inherit;
}

button,
select,
textarea {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

button:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(255, 204, 102, 0.9);
  outline-offset: 3px;
}

.skip-nav {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--bg);
  transform: translateY(-160%);
  transition: transform 160ms var(--ease);
}

.skip-nav:focus {
  transform: translateY(0);
}

.site-header,
main,
.site-footer {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 24px 0 10px;
}

.brand,
.top-actions,
.language-picker {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(64, 242, 176, 0.18), rgba(255, 204, 102, 0.08));
  box-shadow: inset 0 0 24px rgba(64, 242, 176, 0.16);
  font-weight: 800;
}

.brand-text {
  font-weight: 800;
  letter-spacing: 0;
}

.top-actions {
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.source-link,
.language-picker {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(7, 18, 15, 0.58);
  color: var(--muted);
  text-decoration: none;
}

.language-picker {
  gap: 8px;
  font-size: 0.9rem;
}

.language-picker select,
.advanced-grid select {
  min-height: 32px;
  border: 0;
  background: transparent;
  color: var(--ink);
}

.language-picker option,
.advanced-grid option {
  background: #10201d;
  color: var(--ink);
}

.hero-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  align-items: center;
  gap: 36px;
  min-height: 300px;
  padding: 40px 0 24px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: clamp(2.7rem, 7vw, 5.9rem);
  line-height: 0.94;
  letter-spacing: 0;
}

.lede {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.28rem);
  line-height: 1.8;
}

.signal-panel {
  position: relative;
  overflow: hidden;
  min-height: 240px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, rgba(64, 242, 176, 0.1), transparent 52%),
    rgba(13, 28, 25, 0.62);
  box-shadow: var(--shadow);
}

.signal-ring {
  position: absolute;
  inset: 32px;
  border: 1px solid rgba(64, 242, 176, 0.34);
  border-radius: 50%;
  animation: scan 7s linear infinite;
}

.signal-ring::before,
.signal-ring::after {
  position: absolute;
  inset: 20%;
  border: 1px solid rgba(255, 204, 102, 0.24);
  border-radius: inherit;
  content: "";
}

.signal-ring::after {
  inset: 38%;
  background: rgba(64, 242, 176, 0.12);
}

.glyph-lanes {
  position: absolute;
  inset: 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  place-items: center;
  color: rgba(238, 252, 245, 0.8);
  font-size: 2.6rem;
  font-weight: 800;
}

.glyph-lanes span {
  animation: pulse 4s var(--ease) infinite;
}

.glyph-lanes span:nth-child(2n) {
  animation-delay: 700ms;
  color: var(--accent-2);
}

.signal-readout {
  position: absolute;
  right: 18px;
  bottom: 18px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
}

.converter,
.feature-band {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.converter {
  padding: clamp(18px, 3vw, 30px);
}

.converter-head,
.panel-topline,
.panel-actions,
.advanced-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.converter-head {
  margin-bottom: 22px;
}

.converter h2,
.feature-band h2 {
  margin-bottom: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  white-space: nowrap;
}

.status-dot {
  width: 9px;
  height: 9px;
  margin-right: 8px;
  border-radius: 999px;
  background: var(--accent-2);
  box-shadow: 0 0 14px var(--accent-2);
}

.status-pill.is-ready .status-dot {
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
}

.status-pill.is-error .status-dot {
  background: var(--danger);
  box-shadow: 0 0 14px var(--danger);
}

.mode-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.mode-card {
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  color: var(--ink);
  line-height: 1.35;
  overflow-wrap: anywhere;
  text-align: center;
  transition:
    border-color 180ms var(--ease),
    transform 180ms var(--ease),
    background 180ms var(--ease);
}

.mode-card:hover {
  transform: translateY(-2px);
}

.mode-card.is-active {
  border-color: rgba(64, 242, 176, 0.72);
  background: rgba(64, 242, 176, 0.14);
}

.advanced-options {
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(7, 18, 15, 0.44);
}

.advanced-options summary {
  min-height: 48px;
  padding: 14px 16px;
  color: var(--muted);
  cursor: pointer;
}

.advanced-grid {
  flex-wrap: wrap;
  padding: 0 16px 16px;
}

.advanced-grid label {
  display: flex;
  align-items: center;
  gap: 12px;
}

#configSelect {
  min-height: 40px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
}

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.editor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 14px;
  align-items: stretch;
}

.text-panel {
  display: flex;
  min-height: 390px;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(4, 12, 10, 0.52);
}

.panel-topline {
  min-height: 56px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
}

.panel-topline h3 {
  margin-bottom: 0;
  font-size: 1rem;
}

.panel-topline span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

textarea {
  width: 100%;
  min-height: 260px;
  flex: 1;
  resize: vertical;
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 18px;
  font-size: 1.05rem;
  line-height: 1.8;
}

textarea::placeholder {
  color: rgba(159, 186, 176, 0.58);
}

.panel-actions {
  min-height: 58px;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  justify-content: flex-end;
}

.text-button,
.primary-action,
.icon-button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
}

.text-button {
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.04);
}

.primary-action {
  padding: 0 22px;
  border-color: rgba(64, 242, 176, 0.58);
  background: var(--accent);
  color: #04110d;
  font-weight: 800;
}

.icon-button {
  width: 48px;
  background: rgba(255, 204, 102, 0.12);
  font-size: 1.3rem;
}

.center-controls {
  display: flex;
  min-width: 92px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
}

.feature-band {
  margin-top: 22px;
  padding: clamp(18px, 3vw, 30px);
}

.section-heading {
  display: grid;
  gap: 4px;
  margin-bottom: 20px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article {
  min-height: 172px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
}

.feature-index {
  display: block;
  margin-bottom: 26px;
  color: var(--accent-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.feature-grid h3 {
  margin-bottom: 10px;
}

.feature-grid p,
.site-footer {
  color: var(--muted);
  line-height: 1.7;
}

.site-footer {
  padding: 24px 0 34px;
  text-align: center;
}

.site-footer a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

@keyframes scan {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  50% {
    transform: translateY(-5px);
    opacity: 0.52;
  }
}

@media (max-width: 900px) {
  .hero-shell,
  .editor-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .signal-panel {
    min-height: 190px;
  }

  .mode-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .center-controls {
    min-width: 0;
    flex-direction: row;
  }
}

@media (max-width: 620px) {
  .site-header,
  .converter-head,
  .top-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .language-picker,
  .source-link {
    justify-content: space-between;
  }

  .mode-strip {
    grid-template-columns: 1fr;
  }

  .advanced-grid,
  .advanced-grid label {
    align-items: stretch;
    flex-direction: column;
  }

  #configSelect {
    width: 100%;
  }

  .panel-actions {
    flex-wrap: wrap;
  }

  .panel-actions .text-button {
    flex: 1 1 130px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}