/* ==========================================================================
   dangthang.vn — site.css
   Phong cách: hiện đại, sạch sẽ, tone xanh cyan tươi sáng.
   ========================================================================== */

/* -----------------------------
   0. Design tokens
----------------------------- */
:root {
  /* Color */
  --primary:        #00AEEF;
  --primary-600:    #009FE3;
  --primary-700:    #0084BF;
  --secondary:      #00B894;
  --secondary-600:  #00A37F;

  --bg:             #F4FBFF;
  --bg-soft:        #EAF6FF;
  --card:           #FFFFFF;
  --border:         #DDF3FF;
  --border-strong:  #BFE7FA;

  --text:           #0F172A;
  --text-soft:      #334155;
  --text-muted:     #64748B;

  --success:        #10B981;
  --danger:         #EF4444;

  /* Gradients */
  --grad-primary:   linear-gradient(135deg, #00AEEF 0%, #009FE3 50%, #00B894 100%);
  --grad-soft:      linear-gradient(180deg, #F4FBFF 0%, #E6F6FF 100%);
  --grad-hero:      radial-gradient(80% 60% at 20% 10%, rgba(0,174,239,0.18) 0%, rgba(0,174,239,0) 60%),
                    radial-gradient(60% 50% at 90% 20%, rgba(0,184,148,0.16) 0%, rgba(0,184,148,0) 60%),
                    linear-gradient(180deg, #F4FBFF 0%, #FFFFFF 100%);

  /* Shadow */
  --shadow-sm:      0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow:         0 4px 14px rgba(0, 159, 227, 0.08), 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-md:      0 10px 30px rgba(0, 159, 227, 0.12), 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-lg:      0 24px 60px rgba(0, 159, 227, 0.18), 0 4px 12px rgba(15, 23, 42, 0.06);

  /* Radius */
  --r-sm: 8px;
  --r:    12px;
  --r-md: 16px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-pill: 999px;

  /* Type */
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Layout */
  --container: 1200px;
  --header-h: 72px;

  /* Motion */
  --ease: cubic-bezier(.2,.7,.2,1);
}

/* -----------------------------
   1. Reset / base
----------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }

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

.muted { color: var(--text-muted); font-weight: 500; }

.text-grad {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* -----------------------------
   2. Buttons
----------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: transform .15s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
  user-select: none;
}
.btn:active { transform: translateY(1px); }

.btn-sm  { padding: 9px 16px;  font-size: 13.5px; }
.btn-lg  { padding: 14px 24px; font-size: 15px; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 174, 239, 0.35), inset 0 -1px 0 rgba(0,0,0,0.08);
}
.btn-primary:hover { box-shadow: 0 12px 28px rgba(0, 174, 239, 0.45), inset 0 -1px 0 rgba(0,0,0,0.08); transform: translateY(-1px); }

.btn-secondary {
  background: var(--text);
  color: #fff;
}
.btn-secondary:hover { background: #1E293B; }

.btn-outline {
  background: #fff;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-ghost {
  background: transparent;
  color: var(--text);
}
.btn-ghost:hover { background: rgba(0, 174, 239, 0.08); color: var(--primary-700); }

/* -----------------------------
   3. Header
----------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255,255,255,0.95);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}
.brand-mark {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center; justify-content: center;
  border-radius: 10px;
  background: #fff;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}
.brand-text {
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand-dot { color: var(--primary); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  font-weight: 500;
  font-size: 14.5px;
  color: var(--text-soft);
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav-link:hover { color: var(--primary-700); background: rgba(0,174,239,0.06); }
.nav-link.is-active { color: var(--primary-700); }
.nav-link.is-active::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 2px;
  background: var(--grad-primary);
  border-radius: 2px;
}

.nav-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}
.nav-toggle span {
  width: 18px; height: 2px; background: var(--text); border-radius: 2px;
}

/* -----------------------------
   4. Hero
----------------------------- */
.hero {
  position: relative;
  padding: 56px 0 88px;
  background: var(--grad-hero);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-blob {
  position: absolute;
  width: 520px; height: 520px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .55;
}
.hero-blob-1 { background: #00AEEF; top: -160px; left: -120px; }
.hero-blob-2 { background: #00B894; bottom: -200px; right: -120px; opacity: .35; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,159,227,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,159,227,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(60% 50% at 50% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(60% 50% at 50% 40%, #000 30%, transparent 80%);
}

.hero-container {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px 6px 10px;
  background: #fff;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
  box-shadow: var(--shadow-sm);
}
.pill-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--secondary);
  box-shadow: 0 0 0 4px rgba(0,184,148,0.18);
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
  50% { box-shadow: 0 0 0 8px rgba(0,184,148,0); }
}

.hero-title {
  margin: 18px 0 16px;
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}
.hero-desc {
  margin: 0 0 28px;
  max-width: 540px;
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.65;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }

.hero-stats {
  display: flex; align-items: center; gap: 28px;
  padding: 18px 24px;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  width: max-content;
  max-width: 100%;
}
.stat-num { font-size: 22px; font-weight: 800; color: var(--text); letter-spacing: -0.01em; }
.stat-label { font-size: 12.5px; color: var(--text-muted); }
.stat-sep { width: 1px; height: 32px; background: var(--border); }

/* Hero visual */
.hero-visual {
  position: relative;
  height: 480px;
}
.float-card {
  position: absolute;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
}
.float-card-main {
  top: 20px; left: 20px;
  width: 340px;
  padding: 16px;
  animation: floaty 6s ease-in-out infinite;
}
.fc-head {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.fc-dots { display: flex; gap: 6px; }
.fc-dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.fc-dots i:first-child { background: #FF6B6B; }
.fc-dots i:nth-child(2) { background: #FFD166; }
.fc-dots i:last-child { background: #06D6A0; }
.fc-title { font-size: 12px; color: var(--text-muted); font-family: var(--font-mono); }
.fc-body { padding-top: 14px; }
.fc-qr {
  width: 100%; aspect-ratio: 1/1;
  background: #fff;
  border-radius: var(--r);
  border: 1px solid var(--border);
  padding: 16px;
   display: flex;
}
 .fc-qr svg {
   width: 100%;
   height: 100%;
 }
.fc-meta { margin-top: 12px; }
.fc-row { display: flex; justify-content: space-between; padding: 6px 0; font-size: 13px; }
.fc-key { color: var(--text-muted); }
.fc-val { color: var(--text); font-family: var(--font-mono); font-size: 12.5px; }

.float-card-tool {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px;
  border-radius: var(--r-md);
  width: 240px;
  animation: floaty 6s ease-in-out infinite;
  animation-delay: -2s;
}
.float-card-tool { top: 70px; right: 0; }
.float-card-tool-2 { top: auto; bottom: 30px; left: 0; right: auto; animation-delay: -4s; }
.ft-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--primary);
  background: rgba(0,174,239,0.1);
}
.ft-icon-green { color: var(--secondary); background: rgba(0,184,148,0.1); }
.ft-name { font-weight: 600; font-size: 14px; }
.ft-sub { font-size: 12px; color: var(--text-muted); }

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* -----------------------------
   5. Section base
----------------------------- */
.section { padding: 88px 0; }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head-center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: rgba(0,174,239,0.1);
  color: var(--primary-700);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.section-title {
  margin: 0 0 12px;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}
.section-sub {
  margin: 0;
  font-size: 16.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* -----------------------------
   6. QR Tool
----------------------------- */
.qr-section {
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(0,184,148,0.08), transparent 50%),
    radial-gradient(60% 50% at 0% 100%, rgba(0,174,239,0.08), transparent 50%),
    #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.qr-tool {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.qr-controls { display: flex; flex-direction: column; gap: 22px; }

.qr-types {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 5px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  width: max-content;
  max-width: 100%;
}
.qr-type {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all .2s var(--ease);
}
.qr-type:hover { color: var(--text); }
.qr-type.is-active {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,174,239,0.3);
}

.field { display: flex; flex-direction: column; gap: 8px; }
.field-row { flex-direction: row; gap: 20px; }
.field-row > div { flex: 1; }
.field label {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-soft);
  display: flex; justify-content: space-between; align-items: center;
}

.input, .qr-fields textarea {
  width: 100%;
  padding: 13px 16px;
  background: #fff;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--r);
  font-size: 14.5px;
  color: var(--text);
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
  font-family: inherit;
}
.qr-fields textarea { min-height: 96px; resize: vertical; }
.input:focus, .qr-fields textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0,174,239,0.15);
}

/* Two-column inline field */
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.color-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.swatch {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1.5px var(--border-strong);
  cursor: pointer;
  transition: transform .15s var(--ease), box-shadow .15s var(--ease);
  padding: 0;
}
.swatch:hover { transform: scale(1.08); }
.swatch.is-active {
  box-shadow: 0 0 0 2.5px var(--primary);
  transform: scale(1.08);
}
.swatch-custom {
  display: inline-flex; align-items: center; justify-content: center;
  background: #fff !important;
  color: var(--text-muted);
  position: relative;
  cursor: pointer;
}
.swatch-custom input[type="color"] {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer;
}

.range {
  width: 100%;
  -webkit-appearance: none; appearance: none;
  height: 6px;
  background: linear-gradient(to right, var(--primary) 0%, var(--primary) var(--val, 50%), var(--border-strong) var(--val, 50%));
  border-radius: var(--r-pill);
  outline: none;
}
.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .15s var(--ease);
}
.range::-webkit-slider-thumb:hover { transform: scale(1.1); }
.range::-moz-range-thumb {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary);
  cursor: pointer;
}

.seg {
  display: inline-flex;
  padding: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.seg-btn {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all .15s var(--ease);
}
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active {
  background: #fff;
  color: var(--primary-700);
  box-shadow: var(--shadow-sm);
}

/* Preview */
.qr-preview { display: flex; flex-direction: column; gap: 14px; }
.qr-preview-card {
  background: var(--grad-soft);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 22px;
  flex: 1;
  display: flex; flex-direction: column; gap: 18px;
}
.qr-preview-head {
  display: flex; justify-content: space-between; align-items: center;
}
.qr-preview-label {
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--text-muted);
}
.qr-preview-badge {
  padding: 5px 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-soft);
}
.qr-preview-stage {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  min-height: 280px;
  padding: 20px;
  background:
    linear-gradient(45deg, rgba(0,174,239,0.04) 25%, transparent 25%) 0 0/16px 16px,
    linear-gradient(-45deg, rgba(0,174,239,0.04) 25%, transparent 25%) 0 8px/16px 16px,
    #fff;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--r-md);
}
.qr-output {
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  background: #fff;
  border-radius: var(--r);
  box-shadow: var(--shadow);
  max-width: 100%;
}
.qr-output img, .qr-output svg, .qr-output canvas { display: block; max-width: 100%; height: auto; }

.qr-preview-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.qr-preview-actions .btn { flex: 1; min-width: 120px; }

.qr-note {
  display: flex; align-items: center; gap: 8px;
  margin: 0;
  padding: 12px 16px;
  background: rgba(0,184,148,0.08);
  border: 1px solid rgba(0,184,148,0.2);
  border-radius: var(--r);
  font-size: 13px;
  color: var(--secondary-600);
}
.qr-note svg { flex-shrink: 0; }

/* -----------------------------
   7. Tools grid (coming soon)
----------------------------- */
.tools-section { background: var(--bg); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.tool-card {
  position: relative;
  display: flex; flex-direction: column; gap: 14px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.tool-icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r);
  color: var(--primary);
  background: rgba(0,174,239,0.1);
}
.tool-icon-2 { color: var(--secondary); background: rgba(0,184,148,0.1); }
.tool-icon-3 { color: #7C3AED; background: rgba(124,58,237,0.1); }
.tool-icon-4 { color: #F59E0B; background: rgba(245,158,11,0.1); }
.tool-icon-5 { color: var(--primary-700); background: rgba(0,159,227,0.12); }
.tool-icon-6 { color: var(--secondary); background: rgba(0,184,148,0.1); }
.tool-icon-7 { color: #EF4444; background: rgba(239,68,68,0.08); }
.tool-icon-8 { color: var(--primary); background: rgba(0,174,239,0.1); }

.tool-name { margin: 0; font-size: 16.5px; font-weight: 700; color: var(--text); }
.tool-desc { margin: 4px 0 0; font-size: 14px; color: var(--text-muted); line-height: 1.55; }
.tool-tag {
  position: absolute; top: 16px; right: 16px;
  padding: 4px 10px;
  background: rgba(0,184,148,0.12);
  color: var(--secondary-600);
  font-size: 11.5px;
  font-weight: 600;
  border-radius: var(--r-pill);
  letter-spacing: 0.02em;
}

/* -----------------------------
   8. Benefits
----------------------------- */
.benefits-section { background: #fff; border-top: 1px solid var(--border); }
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.benefit {
  padding: 28px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  text-align: left;
}
.benefit-icon {
  width: 52px; height: 52px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-md);
  color: #fff;
  background: var(--grad-primary);
  margin-bottom: 16px;
  box-shadow: 0 8px 18px rgba(0,174,239,0.3);
}
.benefit h3 { margin: 0 0 8px; font-size: 17px; font-weight: 700; }
.benefit p { margin: 0; font-size: 14px; color: var(--text-muted); line-height: 1.6; }

/* -----------------------------
   9. Footer
----------------------------- */
.site-footer {
  background: #0B1220;
  color: #CBD5E1;
  margin-top: 0;
}
.site-footer .brand-text { color: #fff; }
.site-footer .brand-dot { color: var(--primary); }
.site-footer .brand-mark { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.08); }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 72px 0 56px;
}
.footer-about {
  margin: 16px 0 0;
  max-width: 360px;
  font-size: 14px;
  color: #94A3B8;
  line-height: 1.7;
}
.footer-col h4 {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: #94A3B8; font-size: 14px; transition: color .15s var(--ease); }
.footer-col a:hover { color: var(--primary); }

.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); }
.footer-bottom-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 24px;
  font-size: 13px;
  color: #64748B;
}
.heart { color: #EF4444; }
.footer-meta { font-family: var(--font-mono); font-size: 12px; }

/* -----------------------------
   10. Responsive
----------------------------- */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { height: 420px; max-width: 480px; margin: 0 auto; }
  .qr-tool { grid-template-columns: 1fr; }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 720px) {
  .section { padding: 64px 0; }
  .hero { padding: 40px 0 64px; }
  .main-nav, .nav-actions .btn { display: none; }
  .nav-toggle { display: inline-flex; }
  .hero-stats { gap: 16px; padding: 14px 18px; }
  .stat-sep { height: 24px; }
  .qr-tool { padding: 20px; gap: 24px; }
  .field-row { flex-direction: column; gap: 16px; }
  .benefits-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 56px 0 32px; }
  .footer-bottom-inner { flex-direction: column; gap: 8px; }
  .float-card-main { width: 280px; }
  .float-card-tool { width: 200px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 34px; }
  .hero-visual { height: 380px; }
  .float-card-main { left: 10px; width: 240px; }
  .float-card-tool { width: 180px; }
  .qr-preview-actions .btn { min-width: 0; }
}