:root {
  --color-bg: #f7f8fb;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-muted: #5b6472;
  --color-border: #e5e7eb;
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-primary-light: #eef2ff;
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 60px rgba(79, 70, 229, 0.18);
  --container-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

img, svg, canvas {
  display: block;
  max-width: 100%;
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

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

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

.btn-primary:hover {
  background: var(--color-primary-dark);
}

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

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

.btn-small {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 248, 251, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  color: var(--color-primary);
  font-size: 1.5rem;
  line-height: 1;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-title {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.logo-tagline {
  font-weight: 500;
  font-size: 0.7rem;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.15s ease;
}

.nav a:hover {
  color: var(--color-text);
}

/* Hero */
.hero {
  padding: 88px 0 64px;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero-copy p {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 520px;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

.hero-stats li {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.hero-stats strong {
  display: block;
  font-size: 1.3rem;
  color: var(--color-text);
  font-weight: 800;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.qr-float-card {
  background: var(--color-surface);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  animation: float 5s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.qr-canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.qr-canvas-wrap canvas,
.qr-canvas-wrap img {
  border-radius: 12px;
}

/* Generator */
.generator-section {
  padding: 24px 0 96px;
}

.generator-card {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 0;
  background: var(--color-surface);
  border-radius: 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.generator-controls {
  padding: 40px;
}

.generator-controls h2 {
  margin: 0 0 6px;
  font-size: 1.6rem;
}

.muted {
  color: var(--color-muted);
  margin: 0 0 24px;
}

.type-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.type-tab {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: transparent;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-muted);
  transition: all 0.15s ease;
}

.type-tab.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.qr-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field[hidden],
.field-group[hidden] {
  display: none;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="datetime-local"],
.field textarea,
.field select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  font-family: inherit;
  font-size: 0.95rem;
  background: #fbfbfd;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.field input[type="color"] {
  width: 100%;
  height: 44px;
  padding: 4px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: #fbfbfd;
  cursor: pointer;
}

.field input[type="range"] {
  width: 100%;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
  margin-top: 4px;
}

.generator-preview {
  background: linear-gradient(160deg, var(--color-primary-light), #ffffff);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.preview-card {
  background: var(--color-surface);
  border-radius: 20px;
  border: 1px solid var(--color-border);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.qr-status {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 16px 0 4px;
}

.scan-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 16px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.scan-status.is-checking {
  color: var(--color-muted);
  background: var(--color-border);
}

.scan-status.is-valid {
  color: #15803d;
  background: #dcfce7;
}

.scan-status.is-invalid {
  color: #b91c1c;
  background: #fee2e2;
}

.preview-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.review-link {
  display: block;
  margin-top: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
}

.review-link:hover {
  text-decoration: underline;
}

/* Section headings */
.section-title {
  text-align: center;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 10px;
  font-weight: 800;
}

.section-subtitle {
  text-align: center;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto 48px;
}

/* Features */
.features {
  padding: 64px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* How it works */
.how-it-works {
  padding: 64px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  text-align: center;
  padding: 24px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-card h3 {
  margin: 0 0 8px;
}

.step-card p {
  color: var(--color-muted);
  margin: 0;
  font-size: 0.9rem;
}

/* Reviews */
.reviews {
  padding: 64px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.review-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 24px;
}

.review-stars {
  color: #f59e0b;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.review-card p {
  margin: 0 0 14px;
  color: var(--color-text);
  font-size: 0.95rem;
}

.review-author {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.reviews-cta {
  text-align: center;
}

/* FAQ */
.faq {
  padding: 64px 0;
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 18px 22px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  font-weight: 700;
  color: var(--color-primary);
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  margin: 12px 0 0;
  color: var(--color-muted);
}

/* CTA */
.cta {
  padding: 72px 0;
}

.cta-inner {
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  color: #fff;
  border-radius: 24px;
  padding: 56px 32px;
}

.cta-inner h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.cta-inner p {
  margin: 0 0 28px;
  opacity: 0.9;
}

.cta .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: none;
}

.cta .btn-primary:hover {
  background: #f3f4f6;
}

/* Footer */
.site-footer {
  padding: 32px 0 24px;
  border-top: 1px solid var(--color-border);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-nav a,
.footer-link-btn {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-muted);
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
  cursor: pointer;
}

.footer-nav a:hover,
.footer-link-btn:hover {
  color: var(--color-primary);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-inner p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.85rem;
}

/* Privacy policy modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  position: relative;
  background: var(--color-surface);
  border-radius: 20px;
  padding: 32px;
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal h2 {
  margin: 0 0 12px;
  font-size: 1.4rem;
}

.modal h3 {
  margin: 20px 0 6px;
  font-size: 1rem;
}

.modal p {
  margin: 0 0 4px;
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-muted);
}

.modal-close:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

  .generator-card {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 640px) {
  .nav {
    display: none;
  }

  .feature-grid,
  .steps-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .field-row {
    grid-template-columns: 1fr;
  }

  .generator-controls,
  .generator-preview {
    padding: 24px;
  }
}