:root {
  color-scheme: light;

  /* Colors */
  --color-carbon: #181925;
  --color-paper-white: #ffffff;
  --color-linen: #fafafa;
  --color-mist: #f5f5f5;
  --color-fog: #e8e8e8;
  --color-ash: #999999;
  --color-graphite: #666666;
  --color-lavender: #918df6;
  --color-iris: #9580ff;
  --color-mint: #33c758;
  --color-mint-wash: #def6e4;
  --color-amber: #ffa600;
  --color-sky: #2c78fc;
  --color-magenta: #d6409f;
  --color-ember: #ff3e00;

  /* Typography */
  --font-openrunde: "OpenRunde", "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --text-caption: 12px;
  --leading-caption: 1.33;
  --tracking-caption: -0.32px;
  --text-body: 16px;
  --leading-body: 1.5;
  --tracking-body: -0.32px;
  --text-subheading: 18px;
  --leading-subheading: 1.33;
  --tracking-subheading: -0.32px;
  --text-heading-sm: 24px;
  --leading-heading-sm: 1.17;
  --tracking-heading-sm: -0.31px;
  --text-heading: 36px;
  --leading-heading: 1.22;
  --tracking-heading: -0.61px;
  --text-heading-lg: 48px;
  --leading-heading-lg: 1;
  --tracking-heading-lg: -0.34px;
  --text-display: 60px;
  --leading-display: 1.13;
  --tracking-display: -3px;

  /* Spacing */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-48: 48px;
  --spacing-64: 64px;

  /* Layout */
  --page-max-width: 1200px;
  --section-gap: 64px;
  --card-padding: 24px;
  --element-gap: 16px;

  /* Border radius */
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-3xl: 24px;
  --radius-3xl-2: 32px;
  --radius-tags: 9999px;
  --radius-cards: 16px;
  --radius-images: 8px;
  --radius-inputs: 8px;
  --radius-tables: 24px;
  --radius-buttons: 9999px;

  /* Shadows */
  --shadow-subtle: rgba(0, 0, 0, 0.08) 0px 1px 1px 1px, rgba(0, 0, 0, 0.06) 0px 0px 0px 0.5px;
  --shadow-subtle-2: rgba(0, 0, 0, 0.08) 0px 1px 1px 0px, rgba(0, 0, 0, 0.05) 0px 0px 0px 1px;
  --shadow-subtle-3: rgba(0, 0, 0, 0.06) 0px 1px 3px 0px, rgba(0, 0, 0, 0.06) 0px 8px 16px 0px, rgba(0, 0, 0, 0.02) 0px 0px 0px 1px;
}

/* Dark theme */
[data-theme="dark"] {
  color-scheme: dark;

  --color-carbon: #e8e9f2;
  --color-paper-white: #12141c;
  --color-linen: #181b24;
  --color-mist: #20242f;
  --color-fog: #2b3040;
  --color-ash: #8b90a0;
  --color-graphite: #a4a9ba;
  --color-sky: #3d8bff;
  --color-mint-wash: #1d2b21;

  --shadow-subtle: rgba(0, 0, 0, 0.5) 0px 1px 1px 1px, rgba(0, 0, 0, 0.4) 0px 0px 0px 0.5px;
  --shadow-subtle-2: rgba(0, 0, 0, 0.5) 0px 1px 1px 0px, rgba(0, 0, 0, 0.4) 0px 0px 0px 1px;
  --shadow-subtle-3: rgba(0, 0, 0, 0.5) 0px 1px 3px 0px, rgba(0, 0, 0, 0.4) 0px 8px 16px 0px, rgba(0, 0, 0, 0.3) 0px 0px 0px 1px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-openrunde);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  letter-spacing: var(--tracking-body);
  color: var(--color-carbon);
  background: var(--color-paper-white);
}

a {
  color: inherit;
}

.container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Navigation pill ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 8px 0;
}

.nav-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-tags);
  box-shadow: var(--shadow-subtle-2);
  padding: 8px 12px;
  max-width: var(--page-max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 16px;
  color: var(--color-carbon);
  text-decoration: none;
  letter-spacing: var(--tracking-body);
  white-space: nowrap;
}

.logo-img {
  display: block;
  width: 200px;
  height: 48px;
  object-fit: contain;
  object-position: center;
  flex: 0 0 auto;
  border-radius: var(--radius-lg);
}

.footer-logo-img {
  width: 240px;
  height: 58px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  color: var(--color-carbon);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.32px;
  padding: 4px 0;
}

.nav-links a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-fog);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-buttons);
  font-family: var(--font-openrunde);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.32px;
  padding: 10px 20px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-lavender);
  color: #fff;
  box-shadow: var(--shadow-subtle);
}

.btn-primary:hover:not(:disabled) {
  background: #7f7bf5;
}

.btn-success {
  background: var(--color-lavender);
  color: #fff;
  box-shadow: var(--shadow-subtle);
}

.btn-success:hover {
  background: #7f7bf5;
}

.btn-ghost {
  background: transparent;
  color: var(--color-graphite);
}

.btn-ghost:hover {
  color: var(--color-carbon);
}

.btn-theme {
  width: 38px;
  height: 38px;
  padding: 0;
  flex: 0 0 auto;
  background: transparent;
  border: 1px solid var(--color-fog);
  border-radius: 50%;
  color: var(--color-graphite);
}

.btn-theme:hover {
  color: var(--color-carbon);
  border-color: var(--color-lavender);
}

.theme-icon {
  width: 18px;
  height: 18px;
}

.theme-icon-sun {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
}

[data-theme="dark"] .theme-icon-moon {
  display: none;
}

/* ---------- Hero ---------- */
.hero {
  padding: 56px 0 48px;
  text-align: center;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
}

.hero-copy {
  text-align: left;
}

.hero-copy .hero-sub {
  margin: 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-tags);
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.32px;
  color: var(--color-carbon);
  text-decoration: none;
  margin-bottom: 24px;
  transition: border-color 0.15s ease;
}

.chip:hover {
  border-color: var(--color-lavender);
}

.chip-new {
  color: var(--color-sky);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.chip-arrow {
  color: var(--color-carbon);
  font-size: 14px;
}

.hero-kicker {
  margin: 0 0 12px;
  color: var(--color-lavender);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 600;
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
}

.grad {
  background: linear-gradient(to right, var(--color-sky), var(--color-lavender));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  max-width: 480px;
  margin: 0 auto;
  color: var(--color-graphite);
  font-size: 15px;
  letter-spacing: var(--tracking-body);
}

/* ---------- Hero beam diagram ---------- */
.hero-beam {
  position: relative;
  width: 100%;
  max-width: 400px;
  height: 300px;
  justify-self: center;
}

.beam-grid {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.beam-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.beam-row-bottom {
  justify-content: center;
}

.beam-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 10;
}

.beam-dot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--color-fog);
  background: #fff;
  box-shadow: 0 0 20px -12px rgba(0, 0, 0, 0.8);
}

.beam-dot svg {
  width: 22px;
  height: 22px;
}

.beam-dot-center {
  width: 64px;
  height: 64px;
  border: none;
  background: linear-gradient(to right, #2c78fc, #918df6);
  color: #fff;
  box-shadow: 0 12px 28px -10px rgba(44, 120, 252, 0.6);
}

.beam-dot-center svg {
  width: 28px;
  height: 28px;
}

.beam-caption {
  margin-top: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-graphite);
  white-space: nowrap;
}

.beam-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.trust-row {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.trust-row li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ash);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: var(--tracking-caption);
}

.trust-row li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-fog);
}

/* ---------- Gradient band + converter ---------- */
.band {
  padding: 40px 0;
  background: linear-gradient(to right, #2c78fc, #918df6);
}

@supports (background: linear-gradient(in oklab, red, blue)) {
  .band {
    background: linear-gradient(to right in oklab, #2c78fc 0%, #918df6 100%);
  }
}

.converter-card {
  background: var(--color-paper-white);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-subtle-3);
  padding: var(--card-padding);
  max-width: 720px;
  margin: 0 auto;
}

/* Tool dropdown */
.tool-select-group {
  margin-bottom: 16px;
}

.tool-select-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--color-graphite);
  margin-bottom: 8px;
}

.tool-select-wrap {
  display: inline-block;
  width: 100%;
  max-width: 340px;
}

.dropdown {
  position: relative;
  width: 100%;
}

.dropdown-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-openrunde);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.32px;
  color: var(--color-carbon);
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-tags);
  padding: 10px 18px;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.dropdown-trigger:hover {
  border-color: var(--color-fog);
}

.dropdown-trigger:focus-visible,
.dropdown[data-open="true"] .dropdown-trigger {
  outline: none;
  border-color: var(--color-lavender);
  box-shadow: var(--shadow-subtle);
}

.dropdown-trigger-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-caret {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: var(--color-graphite);
  transition: transform 0.15s ease;
}

.dropdown[data-open="true"] .dropdown-caret {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 30;
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-subtle-3);
  padding: 6px;
  max-height: 320px;
  overflow: auto;
  opacity: 0;
  transform: translateY(-6px) scale(0.99);
  transform-origin: top center;
  pointer-events: none;
  transition: opacity 0.12s ease, transform 0.12s ease;
}

.dropdown[data-open="true"] .dropdown-menu {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.dropdown-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  padding: 9px 12px;
  font-family: var(--font-openrunde);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.32px;
  color: var(--color-carbon);
  text-align: left;
  cursor: pointer;
  transition: background 0.1s ease;
}

.dropdown-item:hover,
.dropdown-item:focus-visible {
  background: var(--color-mist);
  outline: none;
}

.dropdown-item-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.dropdown-item-icon svg {
  width: 18px;
  height: 18px;
  fill: var(--color-graphite);
}

.dropdown-item.is-selected .dropdown-item-icon svg {
  fill: var(--color-lavender);
}

.dropdown-item-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown-item-check {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  color: var(--color-lavender);
  opacity: 0;
  transition: opacity 0.1s ease;
}

.dropdown-item.is-selected .dropdown-item-check {
  opacity: 1;
}

.tool-info h2 {
  margin: 0 0 6px;
  font-size: var(--text-heading-sm);
  font-weight: 500;
  line-height: var(--leading-heading-sm);
  letter-spacing: var(--tracking-heading-sm);
  color: var(--color-carbon);
}

.tool-info p {
  margin: 0 0 16px;
  color: var(--color-graphite);
  font-size: 15px;
}

/* Dropzone */
.dropzone {
  border: 1.5px dashed var(--color-fog);
  background: var(--color-mist);
  border-radius: var(--radius-inputs);
  padding: 24px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.is-dragover {
  border-color: var(--color-lavender);
  background: rgba(145, 141, 246, 0.12);
  outline: none;
}

.dz-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-lavender);
  color: #fff;
  font-size: 16px;
  margin-bottom: 10px;
}

.dz-main {
  font-weight: 500;
  font-size: 16px;
  color: var(--color-carbon);
  margin: 0;
  letter-spacing: var(--tracking-body);
}

.dz-sub {
  color: var(--color-ash);
  margin: 4px 0 0;
  font-size: 14px;
  letter-spacing: var(--tracking-caption);
}

.dz-browse {
  color: var(--color-carbon);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.dz-files {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  text-align: left;
}

.dz-files li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-lg);
  padding: 10px 14px;
  font-size: 14px;
  margin-bottom: 6px;
}

.dz-files .file-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-carbon);
}

.dz-files .file-size {
  color: var(--color-ash);
  flex: 0 0 auto;
}

.dz-files .file-bad {
  color: var(--color-ember);
  font-size: 13px;
  flex: 0 0 auto;
}

/* Actions */
.converter-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

/* Status */
.status {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  color: var(--color-graphite);
  font-size: 15px;
  letter-spacing: -0.32px;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-fog);
  border-top-color: var(--color-lavender);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex: 0 0 auto;
}

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

/* Result */
.result {
  margin-top: 16px;
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-subtle-3);
  padding: 20px;
}

#btn-download {
  display: flex;
  margin: 12px auto 0;
  padding: 8px 16px;
  font-size: 13px;
}

.result h3 {
  margin: 0 0 4px;
  font-size: var(--text-subheading);
  font-weight: 500;
  letter-spacing: var(--tracking-subheading);
  color: var(--color-carbon);
}

.result p {
  margin: 0 0 14px;
  color: var(--color-graphite);
  font-size: 14px;
}

.converter-note {
  text-align: center;
  color: rgba(255, 255, 255, 0.92);
  font-size: 14px;
  margin: 20px 0 0;
}

/* ---------- Ad zones ---------- */
.ad-zone {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-paper-white);
  border: 1px solid var(--color-fog);
  border-radius: var(--radius-cards);
  margin: 16px auto;
  max-width: 728px;
  overflow: hidden;
}

.ad-zone-content {
  margin: 48px auto;
}

.ad-zone-footer {
  margin: 0 auto 32px;
}

.ad-placeholder-label {
  color: var(--color-ash);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.adsbygoogle {
  width: 100%;
}

/* ---------- Features ---------- */
.features {
  background: var(--color-linen);
  padding: var(--section-gap) 0;
}

.features h2 {
  text-align: center;
  font-size: var(--text-heading);
  font-weight: 500;
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 48px;
  color: var(--color-carbon);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}

.feature {
  background: transparent;
  padding: var(--spacing-32) 16px;
  text-align: center;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-lavender);
  color: #fff;
  margin-bottom: 16px;
}

.feature-icon svg {
  width: 18px;
  height: 18px;
  fill: #fff;
}

.feature h3 {
  margin: 0 0 8px;
  font-size: var(--text-subheading);
  font-weight: 500;
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-carbon);
}

.feature p {
  margin: 0;
  color: var(--color-graphite);
  font-size: 15px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-paper-white);
  border-top: 1px solid var(--color-fog);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
}

.footer-brand .logo {
  margin-bottom: 8px;
}

.footer-brand p {
  color: var(--color-ash);
  font-size: 14px;
  margin: 0;
  max-width: 280px;
}

.footer-col h4 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.32px;
  color: var(--color-carbon);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: var(--color-graphite);
  text-decoration: none;
  font-size: 14px;
}

.footer-col a:hover {
  color: var(--color-carbon);
}

.footer-bottom {
  border-top: 1px solid var(--color-fog);
  padding-top: 20px;
  color: var(--color-ash);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom nav {
  display: flex;
  gap: 20px;
}

.footer-bottom nav a {
  color: var(--color-ash);
  text-decoration: none;
}

.footer-bottom nav a:hover {
  color: var(--color-carbon);
}

/* ---------- Legal pages ---------- */
.legal {
  padding: 48px 0 64px;
  max-width: 800px;
}

.legal h1 {
  margin: 0 0 6px;
  font-size: var(--text-heading-lg);
  font-weight: 600;
  line-height: var(--leading-heading-lg);
  letter-spacing: var(--tracking-heading-lg);
}

.legal h2 {
  margin: 28px 0 8px;
  font-size: var(--text-heading-sm);
  font-weight: 500;
  color: var(--color-carbon);
}

.legal p {
  color: var(--color-graphite);
}

.legal .muted {
  color: var(--color-ash);
  font-size: 14px;
}

.legal a {
  color: var(--color-lavender);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-beam {
    height: 260px;
  }
}

@media (max-width: 720px) {
  main {
    display: flex;
    flex-direction: column;
  }

  .band {
    order: 1;
  }

  .hero {
    order: 2;
  }

  .features {
    order: 3;
  }

  .nav-links {
    display: none;
  }

  .converter-card {
    padding: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero {
    padding: 32px 0 24px;
  }

  .band {
    padding: 32px 0;
  }
}

@media (max-width: 560px) {
  .converter-actions {
    flex-direction: column;
  }
}