/* ============================================================
   QRop — Design System & Styles
   Dark editorial design with Syne + DM Sans
   ============================================================ */

/* ──────── Google Fonts (loaded in HTML via link) ──────── */

/* ──────── CSS Variables / Design Tokens ──────── */
:root {
  /* Colors */
  --color-bg: #0a0a0f;
  --color-bg-alt: #111118;
  --color-surface: #16161f;
  --color-surface-elevated: #1e1e2a;
  --color-border: #2a2a3a;
  --color-border-hover: #3a3a52;

  --color-text: #eaeaf0;
  --color-text-muted: #8888a0;
  --color-text-dim: #5a5a72;

  --color-accent: #00e5a0;
  --color-accent-hover: #00c88b;
  --color-accent-glow: rgba(0, 229, 160, 0.15);
  --color-accent-subtle: rgba(0, 229, 160, 0.08);

  --color-danger: #ff4d6a;
  --color-warning: #ffb84d;
  --color-info: #4da6ff;

  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --container-max: 1120px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 100px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-header: 200;
  --z-mobile-menu: 300;
  --z-modal: 400;
}

/* ──────── Light Mode ──────── */
[data-theme="light"] {
  --color-bg: #f5f5f8;
  --color-bg-alt: #eeeef2;
  --color-surface: #ffffff;
  --color-surface-elevated: #f0f0f5;
  --color-border: #d8d8e4;
  --color-border-hover: #bbbbd0;

  --color-text: #1a1a2e;
  --color-text-muted: #5a5a72;
  --color-text-dim: #8888a0;

  --color-accent: #00c88b;
  --color-accent-hover: #00a876;
  --color-accent-glow: rgba(0, 200, 139, 0.12);
  --color-accent-subtle: rgba(0, 200, 139, 0.06);

  --color-danger: #e0365a;
  --color-warning: #e6a230;
  --color-info: #3b8fd9;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.10);
  --shadow-glow: 0 0 30px var(--color-accent-glow);
}

[data-theme="light"] .header {
  background: rgba(245, 245, 248, 0.88);
}

[data-theme="light"] .btn-primary {
  box-shadow: 0 4px 20px rgba(0, 200, 139, 0.20);
}
[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 6px 30px rgba(0, 200, 139, 0.28);
}

[data-theme="light"] .mobile-menu {
  background: #f5f5f8;
}

[data-theme="light"] .result-content {
  background: var(--color-bg-alt);
}

/* ──────── Theme Toggle ──────── */
.theme-toggle {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  background: transparent;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  border-color: var(--color-border);
}
.theme-toggle:active {
  transform: scale(0.92);
}
.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1), opacity 0.2s ease;
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
}
.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}
.theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

/* Mobile theme toggle in mobile menu */
.mobile-theme-section {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}
.mobile-theme-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}
.mobile-theme-btn:hover {
  background: var(--color-surface);
}
.mobile-theme-btn svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ──────── Reset ──────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-accent-hover);
}

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

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

/* ──────── Container ──────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ──────── Section Base ──────── */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ──────── Scroll Reveal ──────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-text);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.logo-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-bg);
}

.logo span {
  color: var(--color-accent);
}

.logo .logo-dot {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  margin-left: 1px;
}

/* Desktop Nav */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.desktop-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}
.desktop-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}
.desktop-nav a:hover {
  color: var(--color-text);
}
.desktop-nav a:hover::after {
  width: 100%;
}

/* Header right */
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  padding: 4px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  letter-spacing: 0.02em;
}
.lang-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-elevated);
}
.lang-btn.active {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ──────── Mobile Menu ──────── */
.mobile-menu {
  position: fixed;
  top: 64px;
  right: -100%;
  width: 100%;
  max-width: 360px;
  height: calc(100vh - 64px);
  background: var(--color-bg-alt);
  border-left: 1px solid var(--color-border);
  z-index: var(--z-mobile-menu);
  transition: right var(--transition-slow);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
}
.mobile-menu.open {
  right: 0;
}

.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  top: 64px;
  background: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-mobile-menu) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.mobile-menu-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mobile-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 500;
  transition: background var(--transition-fast);
}
.mobile-nav a:hover {
  background: var(--color-surface);
}

.mobile-lang-section {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
}
.mobile-lang-section h4 {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.mobile-lang-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.mobile-lang-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.mobile-lang-btn:hover {
  background: var(--color-surface);
  color: var(--color-text);
}
.mobile-lang-btn.active {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  font-weight: 600;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  max-width: 540px;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-subheadline {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 4px 20px rgba(0, 229, 160, 0.25);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 229, 160, 0.35);
  color: var(--color-bg);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

/* Stats */
.hero-stats {
  display: flex;
  gap: 40px;
}

.stat-item {
  text-align: left;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* QR Illustration */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-illustration {
  width: 340px;
  height: 340px;
  position: relative;
}

.qr-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(7, 1fr);
  gap: 6px;
  padding: 28px;
}

.qr-cell {
  border-radius: 4px;
  transition: all 0.4s ease;
  animation: qrPulse 3s ease-in-out infinite;
}

.qr-cell.filled {
  background: var(--color-accent);
}
.qr-cell.empty {
  background: var(--color-surface-elevated);
}

@keyframes qrPulse {
  0%, 100% {
    opacity: 0.6;
    transform: scale(0.92);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

.qr-cell:nth-child(odd) { animation-delay: 0.1s; }
.qr-cell:nth-child(3n) { animation-delay: 0.3s; }
.qr-cell:nth-child(5n) { animation-delay: 0.5s; }
.qr-cell:nth-child(7n) { animation-delay: 0.7s; }

.qr-illustration-border {
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  pointer-events: none;
}

.qr-illustration-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  border-radius: var(--radius-xl);
  pointer-events: none;
  animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* Scan line */
.qr-scanline {
  position: absolute;
  left: 20px;
  right: 20px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  border-radius: 2px;
  animation: scanMove 2.5s ease-in-out infinite;
  box-shadow: 0 0 15px var(--color-accent);
}

@keyframes scanMove {
  0% { top: 20px; }
  50% { top: calc(100% - 20px); }
  100% { top: 20px; }
}

/* ============================================================
   SCANNER SECTION
   ============================================================ */
.scanner-section {
  background: var(--color-bg-alt);
}

.scanner-tabs {
  display: flex;
  gap: 4px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  padding: 4px;
  width: fit-content;
  margin: 0 auto 32px;
}

.scanner-tab {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}
.scanner-tab:hover {
  color: var(--color-text);
}
.scanner-tab.active {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Upload Area */
.scanner-panel {
  display: none;
}
.scanner-panel.active {
  display: block;
}

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 60px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--color-surface);
  max-width: 600px;
  margin: 0 auto;
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.upload-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.upload-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
}

.upload-text {
  color: var(--color-text-muted);
  margin-bottom: 4px;
}
.upload-text .browse-link {
  color: var(--color-accent);
  font-weight: 600;
  cursor: pointer;
}

.upload-formats {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-top: 8px;
}

/* Camera */
.camera-panel {
  max-width: 600px;
  margin: 0 auto;
}

.camera-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 16px;
}

#camera-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}
#camera-video.active {
  display: block;
}

.camera-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.camera-guide {
  width: 60%;
  aspect-ratio: 1;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  opacity: 0.6;
}

.camera-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* Scanner Result */
.scanner-result {
  max-width: 600px;
  margin: 24px auto 0;
  padding: 24px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  display: none;
}
.scanner-result.visible {
  display: block;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-label {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.result-content {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 16px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  word-break: break-all;
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
  max-height: 200px;
  overflow-y: auto;
  line-height: 1.5;
}

.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Scanner SEO block */
.seo-block {
  max-width: 700px;
  margin: 48px auto 0;
  padding: 32px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.seo-block h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.seo-block p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* SEO Article (dedicated pages) */
.seo-article {
  max-width: 800px;
  margin: 0 auto;
}

.seo-article .seo-block {
  margin: 0 0 24px;
  max-width: 100%;
}

.seo-article .seo-block h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.seo-article .seo-block p {
  margin-bottom: 14px;
}

.seo-article .seo-block p:last-child {
  margin-bottom: 0;
}

.seo-article .faq-list {
  max-width: 100%;
}

/* ============================================================
   GENERATOR SECTION
   ============================================================ */
.generator-section {
  position: relative;
}

.generator-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
  align-items: start;
}

/* Type selector sidebar */
.qr-type-selector {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 8px;
  border: 1px solid var(--color-border);
  position: sticky;
  top: 88px;
}

.qr-type-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-align: left;
  transition: all var(--transition-fast);
}
.qr-type-btn:hover {
  background: var(--color-surface-elevated);
  color: var(--color-text);
}
.qr-type-btn.active {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.qr-type-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}
.qr-type-btn.active .qr-type-icon {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Generator main area */
.generator-main {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
}

/* Form fields */
.qr-form {
  display: none;
}
.qr-form.active {
  display: block;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-dim);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238888a0' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-select option {
  background: var(--color-surface);
  color: var(--color-text);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Color picker row */
.color-row {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}
.color-group {
  flex: 1;
}
.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.color-picker-wrapper input[type='color'] {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}
.color-picker-wrapper input[type='color']::-webkit-color-swatch-wrapper {
  padding: 0;
}
.color-picker-wrapper input[type='color']::-webkit-color-swatch {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.color-hex {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Size selector */
.size-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.size-option {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}
.size-option:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}
.size-option.active {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* Separator */
.form-separator {
  height: 1px;
  background: var(--color-border);
  margin: 28px 0;
}

/* QR Preview */
.qr-preview-area {
  margin-top: 32px;
  text-align: center;
}

#qr-output {
  display: inline-block;
  padding: 24px;
  background: white;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  min-height: 80px;
}
#qr-output canvas,
#qr-output img {
  display: block;
}

.qr-download-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */
.features-section {
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 32px 24px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}
.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.4rem;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ============================================================
   FAQ SECTION
   ============================================================ */
.faq-section {
  position: relative;
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item:hover {
  border-color: var(--color-border-hover);
}

.faq-item summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  transition: color var(--transition-fast);
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--color-text-dim);
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform var(--transition-fast);
}
.faq-item[open] summary::after {
  content: '−';
  color: var(--color-accent);
}
.faq-item[open] summary {
  color: var(--color-accent);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-top: 16px;
}

.footer-column h4 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-column ul li {
  margin-bottom: 10px;
}
.footer-column ul li a {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}
.footer-column ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  color: var(--color-text-dim);
  font-size: 0.82rem;
}

/* ============================================================
   LOADING / PROCESSING
   ============================================================ */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 20px auto;
}

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

.processing-text {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ============================================================
   TOAST NOTIFICATION
   ============================================================ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  z-index: var(--z-modal);
  opacity: 0;
  transition: all var(--transition-base);
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.toast.success {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.toast.error {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

/* ============================================================
   RESPONSIVE — TABLET (768–1024)
   ============================================================ */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 2.6rem;
  }

  .hero-content {
    gap: 40px;
  }

  .qr-illustration {
    width: 280px;
    height: 280px;
  }

  .generator-layout {
    grid-template-columns: 260px 1fr;
    gap: 24px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .section-title {
    font-size: 2rem;
  }
}

/* ============================================================
   RESPONSIVE — MOBILE (< 768)
   ============================================================ */
@media (max-width: 767px) {
  .desktop-nav {
    display: none;
  }
  .header .lang-switcher {
    display: none;
  }
  .hamburger {
    display: flex;
  }

  .hero {
    padding: 100px 0 50px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-visual {
    order: -1;
  }

  .qr-illustration {
    width: 200px;
    height: 200px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-value {
    font-size: 1.4rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .generator-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .qr-type-selector {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .color-row {
    flex-direction: column;
  }

  .upload-zone {
    padding: 40px 20px;
  }

  .scanner-tabs {
    width: 100%;
  }
  .scanner-tab {
    flex: 1;
    text-align: center;
  }
}

/* ============================================================
   RESPONSIVE — SMALL MOBILE (< 480)
   ============================================================ */
@media (max-width: 479px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-subheadline {
    font-size: 0.95rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .qr-type-selector {
    grid-template-columns: 1fr;
  }

  .generator-main {
    padding: 20px 16px;
  }

  .qr-download-buttons {
    flex-direction: column;
  }
  .qr-download-buttons .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-accent {
  color: var(--color-accent);
}

.hidden {
  display: none !important;
}