@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

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

:root {
  --blue-900: #0a1628;
  --blue-800: #0f2147;
  --blue-700: #163168;
  --blue-500: #1e4db7;
  --blue-400: #2e63d8;
  --blue-100: #dce8ff;
  --blue-50:  #f0f5ff;

  --yellow-400: #f5c518;
  --yellow-300: #f7d44c;
  --yellow-200: #fbe89a;
  --yellow-100: #fef6d0;

  --white: #ffffff;
  --gray-400: #9aa3b5;
  --gray-600: #5a6478;

  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 2rem;

  --shadow-btn: 0 2px 8px rgba(30,77,183,0.25);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--blue-900);
  color: var(--white);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Background ── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 3rem 3rem;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -10rem;
  left: 50%;
  transform: translateX(-50%);
  width: 60rem;
  height: 40rem;
  background: radial-gradient(ellipse at center, rgba(30,77,183,0.35) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.bg-glow-bottom {
  position: fixed;
  bottom: -15rem;
  right: -10rem;
  width: 45rem;
  height: 45rem;
  background: radial-gradient(ellipse at center, rgba(245,197,24,0.08) 0%, transparent 65%);
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ── */
.page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Nav ── */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
}

.nav-logo-mark {
  width: 2rem;
  height: 2rem;
  background: var(--yellow-400);
  border-radius: 0.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-logo-mark svg {
  width: 1.125rem;
  height: 1.125rem;
  color: var(--blue-900);
}

.nav-logo-text {
  font-family: 'Playfair Display', serif;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.nav-badge {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--yellow-400);
  background: rgba(245,197,24,0.12);
  border: 1px solid rgba(245,197,24,0.25);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Hero ── */
.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1.5rem 5rem;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yellow-300);
  margin-bottom: 1.5rem;
}

.hero-eyebrow::before,
.hero-eyebrow::after {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--yellow-300);
  opacity: 0.5;
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: 1.25rem;
  max-width: 18ch;
}

.hero-title em {
  font-style: italic;
  color: var(--yellow-400);
}

.hero-sub {
  font-size: 1.0625rem;
  font-weight: 300;
  color: var(--blue-100);
  opacity: 0.8;
  max-width: 38ch;
  line-height: 1.65;
  margin-bottom: 3.5rem;
}

/* ── Card ── */
.card {
  width: 100%;
  max-width: 36rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2.25rem;
  backdrop-filter: blur(12px);
}

/* ── Input ── */
.input-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-400);
  margin-bottom: 0.625rem;
}

.input-wrap {
  position: relative;
  margin-bottom: 1.375rem;
}

.input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--gray-400);
  pointer-events: none;
}

input[type="text"] {
  width: 100%;
  height: 3.25rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9375rem;
  padding: 0 1rem 0 2.75rem;
  outline: none;
  transition: border-color 0.2s, background 0.2s, box-shadow 0.2s;
}

input[type="text"]::placeholder { color: rgba(255,255,255,0.28); }

input[type="text"]:focus {
  border-color: var(--yellow-400);
  background: rgba(255,255,255,0.09);
  box-shadow: 0 0 0 3px rgba(245,197,24,0.12);
}

/* ── Size slider ── */
.size-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.625rem;
}

.size-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-400);
}

.size-value-badge {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--yellow-400);
  background: rgba(245,197,24,0.12);
  border: 1px solid rgba(245,197,24,0.22);
  padding: 0.1875rem 0.625rem;
  border-radius: 2rem;
  letter-spacing: 0.02em;
  min-width: 4.5rem;
  text-align: center;
  transition: transform 0.1s;
}

.slider-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.slider-cap {
  font-size: 0.75rem;
  color: var(--gray-400);
  min-width: 2rem;
  text-align: center;
  flex-shrink: 0;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 0.25rem;
  border-radius: 2rem;
  background: rgba(255,255,255,0.12);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--yellow-400);
  border: 2px solid var(--blue-900);
  box-shadow: 0 0 0 3px rgba(245,197,24,0.25);
  cursor: pointer;
  transition: box-shadow 0.15s;
}

input[type="range"]::-moz-range-thumb {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--yellow-400);
  border: 2px solid var(--blue-900);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  border-radius: 2rem;
}

input[type="range"]:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 5px rgba(245,197,24,0.3);
}

/* ── Generate button ── */
.btn-generate {
  width: 100%;
  height: 3.25rem;
  background: var(--blue-500);
  border: none;
  border-radius: var(--radius-md);
  color: var(--white);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-btn);
  transition: background 0.18s, transform 0.12s, box-shadow 0.18s;
}

.btn-generate svg {
  width: 1.125rem;
  height: 1.125rem;
  transition: transform 0.2s;
}

.btn-generate:hover {
  background: var(--blue-400);
  box-shadow: 0 4px 16px rgba(30,77,183,0.4);
}

.btn-generate:hover svg { transform: rotate(15deg); }
.btn-generate:active { transform: scale(0.98); }

/* ── Error ── */
.error-msg {
  font-size: 0.8125rem;
  color: #ff8080;
  margin-top: 0.625rem;
  display: none;
  align-items: center;
  gap: 0.375rem;
}

.error-msg.show { display: flex; }

/* ── QR Result ── */
.qr-result {
  display: none;
  margin-top: 2rem;
  animation: slideUp 0.35s cubic-bezier(0.16,1,0.3,1) both;
}

.qr-result.visible { display: block; }

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

.divider {
  height: 1px;
  background: rgba(255,255,255,0.08);
  margin-bottom: 2rem;
}

/* ── QR canvas frame — fixed display size, download size is separate ── */
.qr-canvas-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  position: relative;
}

.qr-corner {
  position: absolute;
  width: 1rem;
  height: 1rem;
  border-color: var(--blue-500);
  border-style: solid;
  opacity: 0.4;
}

.qr-corner.tl { top: 0.5rem; left: 0.5rem; border-width: 2px 0 0 2px; border-radius: 2px 0 0 0; }
.qr-corner.tr { top: 0.5rem; right: 0.5rem; border-width: 2px 2px 0 0; border-radius: 0 2px 0 0; }
.qr-corner.bl { bottom: 0.5rem; left: 0.5rem; border-width: 0 0 2px 2px; border-radius: 0 0 0 2px; }
.qr-corner.br { bottom: 0.5rem; right: 0.5rem; border-width: 0 2px 2px 0; border-radius: 0 0 2px 0; }

#qrcode canvas,
#qrcode img {
  display: block;
  border-radius: 0.25rem;
  image-rendering: pixelated;
  transition: width 0.2s ease, height 0.2s ease;
}

/* ── URL pill ── */
.qr-url-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: 2rem;
  padding: 0.5rem 1rem;
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.qr-url-pill svg {
  width: 0.875rem;
  height: 0.875rem;
  color: var(--yellow-400);
  flex-shrink: 0;
}

.qr-url-text {
  font-size: 0.8125rem;
  color: var(--gray-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Download button ── */
.btn-download {
  width: 100%;
  height: 3rem;
  background: transparent;
  border: 1px solid var(--yellow-400);
  border-radius: var(--radius-md);
  color: var(--yellow-400);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.18s;
}

.btn-download svg {
  width: 1rem;
  height: 1rem;
}

.btn-download:hover {
  background: var(--yellow-400);
  color: var(--blue-900);
  box-shadow: 0 4px 16px rgba(245,197,24,0.25);
}

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

/* ── Stats ── */
.stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 3.5rem;
}

.stat { text-align: center; }

.stat-value {
  font-family: 'Playfair Display', serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--yellow-400);
  line-height: 1;
  margin-bottom: 0.375rem;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--gray-400);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.2);
  letter-spacing: 0.05em;
  border-top: 1px solid rgba(255,255,255,0.05);
}

/* ── Responsive ── */
@media (max-width: 40rem) {
  nav { padding: 1.25rem 1.5rem; }
  .hero { padding: 2.5rem 1rem 3rem; }
  .card { padding: 1.75rem 1.25rem; }
  .stats { gap: 2rem; }
}