:root {
  --ink: #101828;
  --muted: #667085;
  --soft: #f2f4f7;
  --line: #d0d5dd;
  --white: #ffffff;
  --primary: #265df2;
  --primary-dark: #1745c5;
  --accent: #7c3aed;
  --success: #039855;
  --shadow: 0 24px 80px rgba(16, 24, 40, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #fbfcff;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

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

.container {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at top left, rgba(38, 93, 242, 0.13), transparent 34rem),
    radial-gradient(circle at top right, rgba(124, 58, 237, 0.13), transparent 32rem),
    linear-gradient(180deg, #f7f9ff 0%, #ffffff 44%, #f8fafc 100%);
}

.site-header {
  padding: 22px 0;
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-size: 1.1rem;
}

.brand-mark {
  width: 60px;
  height: 60px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 16px 34px rgba(38, 93, 242, 0.25);
}

.brand-mark svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}


.hero {
  padding: 24px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  font-weight: 800;
}

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

h1 {
  margin-bottom: 16px;
  font-size: clamp(1.25rem, 2.5vw, 2.5rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  max-width: 620px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.7rem, 2.5vw, 2.45rem);
  line-height: 1.05;
  letter-spacing: -0.055em;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}

.hero-text {
  max-width: 665px;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 999px;
  padding: 14px 20px;
  font-weight: 800;
  color: var(--ink);
  background: var(--soft);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 18px 36px rgba(38, 93, 242, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 20px 44px rgba(38, 93, 242, 0.36);
}

.btn-secondary {
  background: #ffffff;
  border: 1px solid rgba(208, 213, 221, 0.9);
}

.btn-small {
  padding: 12px 18px;
  white-space: nowrap;
  color: #fff;
  background: var(--ink);
}

.btn-ghost {
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--line);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  color: var(--muted);
  font-weight: 700;
}

.trust-row span {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(208, 213, 221, 0.75);
  padding: 8px 12px;
  border-radius: 999px;
}

.hero-card {
  padding: 18px;
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(208, 213, 221, 0.58);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.mock-window {
  min-height: 460px;
  border-radius: 28px;
  padding: 22px;
  background: #101828;
  overflow: hidden;
  position: relative;
}

.window-dots {
  display: flex;
  gap: 8px;
}

.window-dots span {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.35);
}

.mock-qr {
  margin: 48px auto 38px;
  width: 250px;
  height: 250px;
  border-radius: 36px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 28px;
  background: #fff;
}

.mock-qr span {
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.mock-qr span:nth-child(2n) {
  background: #101828;
}

.mock-qr span:nth-child(5),
.mock-qr span:nth-child(8),
.mock-qr span:nth-child(11) {
  opacity: 0.16;
}

.mock-controls {
  display: grid;
  gap: 12px;
}

.mock-controls span {
  display: block;
  height: 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
}

.generator-section {
  padding: 24px 0 72px;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  gap: 24px;
  align-items: start;
}

.panel {
  border: 1px solid rgba(208, 213, 221, 0.76);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.controls-panel,
.preview-panel {
  padding: clamp(20px, 3vw, 32px);
}

.panel-header {
  margin-bottom: 24px;
}

.control-form {
  display: grid;
  gap: 22px;
}

.field {
  display: grid;
  gap: 8px;
}

.field.full {
  grid-column: 1 / -1;
}

label,
summary {
  font-weight: 800;
  letter-spacing: -0.015em;
}

input[type="url"],
input[type="text"],
input[type="file"],
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: #fff;
  color: var(--ink);
  min-height: 48px;
  padding: 11px 14px;
  outline: none;
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}

input:focus,
select:focus {
  border-color: rgba(38, 93, 242, 0.72);
  box-shadow: 0 0 0 4px rgba(38, 93, 242, 0.12);
}

input[type="color"] {
  width: 100%;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 15px;
  padding: 6px;
  background: #fff;
  cursor: pointer;
}

small {
  color: var(--muted);
}

.url-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.settings-grid.compact {
  margin-top: 4px;
}

.range-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 64px;
  align-items: center;
  gap: 12px;
}

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

output {
  font-weight: 800;
  color: var(--muted);
  text-align: right;
}

.advanced {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  background: #fff;
}

.advanced summary {
  cursor: pointer;
  padding: 16px 18px;
  list-style-position: inside;
}

.advanced-body {
  display: grid;
  gap: 16px;
  padding: 0 18px 18px;
}

.check-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-weight: 700;
}

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

.preset-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 0 18px 18px;
}

.preset {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 12px 8px;
  cursor: pointer;
  font-weight: 800;
}

.preset.is-active,
.preset:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.preview-panel {
  position: sticky;
  top: 20px;
}

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

.status-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  color: #027a48;
  background: #ecfdf3;
  font-weight: 800;
  font-size: 0.84rem;
}

.status-pill.is-error {
  color: #b42318;
  background: #fef3f2;
}

.qr-frame {
  margin: 0 auto 22px;
  width: min(100%, 460px);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    linear-gradient(#fff, #fff) padding-box,
    linear-gradient(135deg, rgba(38, 93, 242, 0.7), rgba(124, 58, 237, 0.7)) border-box;
  border: 2px solid transparent;
  border-radius: 32px;
  box-shadow: inset 0 0 0 1px rgba(208, 213, 221, 0.58);
}

.qr-frame.circle {
  border-radius: 50%;
  padding: 42px;
}

.qr-code {
  max-width: 100%;
  max-height: 100%;
  display: grid;
  place-items: center;
}

.qr-code canvas,
.qr-code svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.preview-note {
  margin-top: 18px;
  padding: 16px;
  border-radius: 18px;
  color: var(--muted);
  background: #f8fafc;
  border: 1px solid var(--line);
}

.features {
  padding: 72px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 26px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card {
  padding: 24px;
  border-radius: var(--radius-md);
  background: #fff;
  border: 1px solid rgba(208, 213, 221, 0.8);
  box-shadow: 0 16px 42px rgba(16, 24, 40, 0.07);
}

.feature-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.icon-badge {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 900;
  margin-bottom: 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}


.site-footer {
  padding: 28px 0 42px;
  color: var(--muted);
}

.site-footer a {
  color: var(--primary);
  font-weight: 800;
}

@media (max-width: 980px) {
  .hero-grid,
  .app-shell,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 520px;
  }

  .preview-panel {
    position: static;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1180px);
  }

  .site-header {
    padding-top: 14px;
  }

  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }


  .hero {
    padding: 28px 0 44px;
  }

  .settings-grid,
  .feature-grid,
  .download-grid,
  .url-row,
  .preset-grid {
    grid-template-columns: 1fr;
  }

  .mock-window {
    min-height: 360px;
  }

  .mock-qr {
    width: 220px;
    height: 220px;
    margin-top: 36px;
  }

  .preview-top {
    flex-direction: column;
  }
}