:root {
  --bg: #07090f;
  --panel: rgba(8, 12, 22, 0.72);
  --panel-strong: rgba(13, 20, 34, 0.9);
  --ink: #f8fbff;
  --muted: #a7b4c8;
  --line: rgba(186, 220, 255, 0.18);
  --field-line: rgba(255, 255, 255, 0.05);
  --field-line-strong: rgba(255, 255, 255, 0.04);
  --cyan: #45f2ff;
  --blue: #3378ff;
  --pink: #ff4fd8;
  --lime: #cff86b;
  --button-ink: #061018;
}

:root[data-theme="light"] {
  --bg: #f5f8ff;
  --panel: rgba(255, 255, 255, 0.76);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --ink: #0d1728;
  --muted: #516070;
  --line: rgba(20, 44, 78, 0.14);
  --field-line: rgba(20, 44, 78, 0.06);
  --field-line-strong: rgba(20, 44, 78, 0.045);
  --cyan: #007b8f;
  --blue: #2d63e4;
  --pink: #bf2aa4;
  --lime: #567a00;
  --button-ink: #061018;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 12%, rgba(69, 242, 255, 0.18), transparent 29%),
    radial-gradient(circle at 84% 18%, rgba(255, 79, 216, 0.14), transparent 30%),
    radial-gradient(circle at 48% 68%, rgba(51, 120, 255, 0.14), transparent 34%),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

a {
  color: inherit;
}

#field {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(var(--field-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--field-line-strong) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black, transparent 80%);
}

.shell {
  position: relative;
  z-index: 2;
  width: min(1220px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 28px 0 42px;
}

.topbar,
.tool-menu,
.tool-panel,
.signals article {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(22px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
  padding: 12px 14px;
  border-radius: 8px;
}

.brand,
.nav-actions,
.hero-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  font-size: 18px;
}

.brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  filter: drop-shadow(0 0 18px rgba(69, 242, 255, 0.48));
}

.nav-actions {
  gap: 8px;
}

.nav-actions a,
.theme-control,
.primary-link,
.download,
.action-button {
  min-height: 42px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 800;
}

.nav-actions a,
.theme-control {
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  color: #d7e7ff;
  border: 1px solid transparent;
}

:root[data-theme="light"] .nav-actions a,
:root[data-theme="light"] .theme-control {
  color: #1a2940;
}

.nav-actions a:hover,
.theme-control:hover {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.06);
}

.theme-control {
  gap: 8px;
  min-height: 42px;
  font-size: 13px;
}

.theme-control select {
  width: auto;
  height: 32px;
  min-width: 82px;
  margin-top: 0;
  padding: 0 28px 0 10px;
  color: var(--ink);
  background: var(--panel-strong);
}

.hero {
  max-width: 920px;
  min-height: 430px;
  padding: 70px 0 40px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 800px;
  margin-bottom: 24px;
  font-size: clamp(52px, 8.4vw, 112px);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
}

.lede {
  max-width: 650px;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.55;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-actions span {
  color: var(--muted);
  font-size: 14px;
}

.primary-link,
.action-button,
.download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  cursor: pointer;
  color: var(--button-ink);
  background: linear-gradient(135deg, var(--cyan), #ffffff 48%, var(--pink));
  box-shadow: 0 16px 38px rgba(69, 242, 255, 0.22);
}

.primary-link {
  padding: 0 22px;
}

.tool-grid {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.tool-menu,
.tool-panel,
.signals article {
  border-radius: 8px;
}

.tool-menu {
  position: sticky;
  top: 16px;
  padding: 10px;
}

.tool-tab {
  width: 100%;
  min-height: 78px;
  padding: 14px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  background: transparent;
}

.tool-tab + .tool-tab {
  margin-top: 8px;
}

.tool-tab span,
.tool-tab small {
  display: block;
}

.tool-tab span {
  font-weight: 800;
}

.tool-tab small {
  margin-top: 5px;
  color: var(--muted);
}

.tool-tab.active {
  border-color: rgba(69, 242, 255, 0.38);
  background: linear-gradient(135deg, rgba(69, 242, 255, 0.13), rgba(255, 79, 216, 0.1));
}

.tool-panel {
  display: none;
  min-height: 620px;
  padding: clamp(18px, 3vw, 30px);
}

.tool-panel.active {
  display: block;
}

.panel-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.badge {
  flex: 0 0 auto;
  padding: 9px 12px;
  border: 1px solid rgba(207, 248, 107, 0.32);
  border-radius: 999px;
  color: #eaffaa;
  background: rgba(207, 248, 107, 0.08);
  font-size: 12px;
}

.dropzone {
  display: grid;
  place-items: center;
  min-height: 190px;
  padding: 24px;
  border: 1px dashed rgba(166, 228, 255, 0.38);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
  text-align: center;
}

.dropzone input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.dropzone span {
  font-size: 24px;
  font-weight: 850;
}

.dropzone small,
.hint,
.result-card p,
.signals p {
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}

label {
  color: #d7e7ff;
  font-size: 13px;
  font-weight: 780;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 8px;
  border: 1px solid rgba(196, 224, 255, 0.24);
  border-radius: 8px;
  outline: none;
  background: rgba(255, 255, 255, 0.07);
  color: var(--ink);
}

input,
select {
  height: 50px;
  padding: 0 13px;
}

textarea {
  resize: vertical;
  padding: 14px;
  line-height: 1.5;
}

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(69, 242, 255, 0.78);
  box-shadow: 0 0 0 4px rgba(69, 242, 255, 0.12);
}

.result-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
}

#image-preview {
  width: 100%;
  aspect-ratio: 1.2;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
}

.download,
.action-button {
  min-width: 154px;
  min-height: 50px;
  padding: 0 18px;
}

.download.disabled {
  pointer-events: none;
  opacity: 0.42;
}

.stack {
  display: grid;
  gap: 14px;
}

.qr-output {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.qr-output img {
  display: none;
  width: 220px;
  height: 220px;
  border: 12px solid #fff;
  border-radius: 8px;
  background: #fff;
}

.qr-output img.ready {
  display: block;
}

.metrics,
.signals {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metrics article,
.signals article {
  padding: 18px;
}

.metrics article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
}

.metrics strong {
  display: block;
  font-size: clamp(30px, 5vw, 54px);
}

.metrics span,
.signals span {
  color: var(--muted);
}

.unit-controls {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.conversion-result {
  margin-top: 18px;
  padding: 24px;
  border: 1px solid rgba(69, 242, 255, 0.32);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(69, 242, 255, 0.12), rgba(255, 79, 216, 0.08));
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 850;
}

.signals {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 16px;
}

.signals strong {
  color: var(--cyan);
  font-size: 13px;
}

.signals span {
  display: block;
  margin: 18px 0 8px;
  color: #dce9f8;
  font-size: 20px;
  font-weight: 820;
}

.signals p {
  margin-bottom: 0;
  line-height: 1.5;
}

@media (max-width: 900px) {
  .shell {
    width: min(100% - 28px, 680px);
    padding-top: 14px;
  }

  .topbar,
  .panel-head {
    align-items: stretch;
  }

  .nav-actions {
    gap: 4px;
  }

  .hero {
    min-height: auto;
    padding: 46px 0 34px;
  }

  .tool-grid,
  .result-card,
  .controls,
  .unit-controls,
  .metrics,
  .signals {
    grid-template-columns: 1fr;
  }

  .tool-menu {
    position: static;
  }

  .panel-head {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .topbar {
    flex-wrap: wrap;
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .nav-actions a,
  .theme-control {
    padding-inline: 10px;
  }
}

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