/* === 9BAHT Design System === */
:root {
  --bg: #f8fafc; --surface: #ffffff; --surface-hover: #f1f5f9;
  --border: #e2e8f0; --border-light: #f1f5f9;
  --text: #1e293b; --text-secondary: #64748b; --text-muted: #94a3b8;
  --primary: #4f46e5; --primary-hover: #4338ca; --primary-light: #eef2ff;
  --accent: #7c3aed; --success: #10b981; --danger: #ef4444;
  --gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 24px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1);
  --radius: .75rem; --radius-lg: 1rem; --radius-xl: 1.25rem;
  --font-th: 'Noto Sans Thai', sans-serif;
  --font-en: 'Inter', sans-serif;
  --transition: .2s cubic-bezier(.4,0,.2,1);
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-en), var(--font-th);
  background: var(--bg); color: var(--text);
  line-height: 1.6; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
html[lang="th"] body { font-family: var(--font-th), var(--font-en); }
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
button { cursor: pointer; font: inherit; border: none; background: none; }
input, select, textarea { font: inherit; }

/* === Layout === */
.container { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }

/* === Navbar === */
#navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85); backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
}
#navbar nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1120px; margin: 0 auto; padding: .75rem 1.5rem; gap: 1rem;
}
.nav-logo {
  display: flex; align-items: center; gap: .5rem;
  font-weight: 800; font-size: 1.25rem; color: var(--text);
}
.nav-logo .logo-icon {
  width: 32px; height: 32px; background: var(--gradient);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: .9rem;
}
.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a {
  color: var(--text-secondary); font-weight: 500; font-size: .9rem;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--primary); }
#lang-toggle {
  padding: .4rem .8rem; border-radius: .5rem;
  border: 1px solid var(--border); font-weight: 600; font-size: .8rem;
  color: var(--text-secondary); transition: all var(--transition);
}
#lang-toggle:hover { border-color: var(--primary); color: var(--primary); }

/* === Hero === */
#hero {
  text-align: center; padding: 5rem 1.5rem 3rem;
  max-width: 720px; margin: 0 auto;
}
#hero h1 {
  font-size: clamp(2rem, 5vw, 3rem); font-weight: 800;
  line-height: 1.2; letter-spacing: -.02em;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 1rem;
}
#hero .subtitle { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 2.5rem; }
.input-group {
  display: flex; gap: .5rem;
  background: var(--surface); padding: .5rem;
  border-radius: var(--radius-lg); border: 2px solid var(--border);
  box-shadow: var(--shadow); transition: border-color var(--transition);
  max-width: 600px; margin: 0 auto 2rem;
}
.input-group:focus-within { border-color: var(--primary); }
.input-group input {
  flex: 1; padding: .75rem 1rem; border: none; outline: none;
  background: transparent; font-size: 1rem; min-width: 0;
}
.input-group .btn-generate {
  padding: .75rem 1.5rem; background: var(--gradient);
  color: #fff; font-weight: 600; border-radius: .625rem;
  white-space: nowrap; transition: opacity var(--transition), transform var(--transition);
}
.input-group .btn-generate:hover { opacity: .9; transform: translateY(-1px); }

/* QR Type Tabs */
.type-tabs {
  display: flex; gap: .375rem; justify-content: center; flex-wrap: wrap;
  margin-bottom: 1rem;
}
.type-tab {
  padding: .5rem 1rem; border-radius: .5rem; font-size: .85rem;
  font-weight: 500; color: var(--text-secondary); background: var(--surface);
  border: 1px solid var(--border-light); transition: all var(--transition);
}
.type-tab:hover { border-color: var(--primary); color: var(--primary); }
.type-tab.active {
  background: var(--primary-light); color: var(--primary);
  border-color: transparent; font-weight: 600;
}

/* Type-specific inputs */
.type-inputs { max-width: 600px; margin: 0 auto; }
.type-input-group { display: none; flex-direction: column; gap: .5rem; }
.type-input-group.active { display: flex; }
.type-input-group input,
.type-input-group textarea,
.type-input-group select {
  padding: .75rem 1rem; border: 2px solid var(--border);
  border-radius: var(--radius); font-size: .95rem;
  transition: border-color var(--transition); background: var(--surface);
}
.type-input-group input:focus,
.type-input-group textarea:focus,
.type-input-group select:focus {
  outline: none; border-color: var(--primary);
}
.type-input-group textarea { resize: vertical; min-height: 80px; }
.input-row { display: flex; gap: .5rem; }
.input-row > * { flex: 1; }

/* === Editor Section === */
#editor {
  padding: 3rem 1.5rem; max-width: 1120px; margin: 0 auto;
  opacity: 1; transition: opacity .4s ease;
}
#editor.hidden { display: none; opacity: 0; }
.editor-grid {
  display: grid; grid-template-columns: 1fr 380px;
  gap: 2rem; align-items: start;
}

/* Preview Panel */
.preview-panel {
  background: var(--surface); border-radius: var(--radius-xl);
  border: 1px solid var(--border-light); padding: 2rem;
  box-shadow: var(--shadow); text-align: center; position: sticky; top: 5rem;
}
#qr-canvas {
  display: flex; justify-content: center; align-items: center;
  min-height: 300px; position: relative;
  margin-bottom: 1rem;
}
#qr-canvas canvas, #qr-canvas svg { border-radius: .5rem; }
.watermark-overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 1rem;
  pointer-events: none; z-index: 10;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 60px,
    rgba(239,68,68,0.04) 60px,
    rgba(239,68,68,0.04) 62px
  );
}
.watermark-overlay span {
  font-size: 1.8rem; font-weight: 900; color: rgba(239,68,68,.55);
  transform: rotate(-25deg); letter-spacing: .15em;
  text-transform: uppercase; user-select: none;
  text-shadow: 0 0 8px rgba(255,255,255,.9), 0 1px 3px rgba(239,68,68,.4);
}
.preview-badge {
  display: inline-flex; align-items: center; gap: .35rem;
  padding: .35rem .75rem; border-radius: 2rem;
  background: #fef2f2; color: #dc2626; font-size: .75rem; font-weight: 600;
  margin-bottom: 1.25rem;
}
.download-actions { display: flex; flex-direction: column; gap: .5rem; }

/* Buttons */
.btn {
  padding: .75rem 1.5rem; border-radius: var(--radius); font-weight: 600;
  font-size: .9rem; transition: all var(--transition); text-align: center;
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
}
.btn-primary {
  background: var(--gradient); color: #fff; box-shadow: 0 2px 8px rgba(79,70,229,.3);
}
.btn-primary:hover { opacity: .9; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(79,70,229,.35); }
.btn-secondary {
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--surface-hover); border-color: var(--text-muted); }
.btn-outline {
  background: transparent; color: var(--primary); border: 1px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-sm { padding: .5rem 1rem; font-size: .8rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; pointer-events: none; }

/* Controls Panel */
.controls-panel {
  background: var(--surface); border-radius: var(--radius-xl);
  border: 1px solid var(--border-light); padding: 1.5rem;
  box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 1.5rem;
}
.control-section h3 {
  font-size: .85rem; font-weight: 700; color: var(--text);
  margin-bottom: .75rem; text-transform: uppercase; letter-spacing: .05em;
}

/* Style Buttons Grid */
.style-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .375rem;
}
.style-btn {
  padding: .5rem; border-radius: .5rem; font-size: .75rem; font-weight: 600;
  border: 2px solid var(--border-light); color: var(--text-secondary);
  text-align: center; transition: all var(--transition);
}
.style-btn:hover { border-color: var(--primary); color: var(--primary); }
.style-btn.active {
  border-color: var(--primary); background: var(--primary-light); color: var(--primary);
}

/* Color Controls */
.color-row { display: flex; gap: 1rem; margin-bottom: .75rem; }
.color-input { flex: 1; }
.color-input label {
  display: block; font-size: .75rem; color: var(--text-muted);
  margin-bottom: .35rem; font-weight: 500;
}
.color-input input[type="color"] {
  width: 100%; height: 40px; border: 2px solid var(--border);
  border-radius: .5rem; cursor: pointer; padding: 2px;
  background: var(--surface);
}
.color-input input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.color-input input[type="color"]::-webkit-color-swatch { border-radius: 4px; border: none; }
.color-presets { display: flex; gap: .375rem; flex-wrap: wrap; }
.color-preset {
  width: 32px; height: 32px; border-radius: .5rem;
  border: 2px solid var(--border-light); cursor: pointer;
  transition: all var(--transition); flex-shrink: 0;
}
.color-preset:hover { transform: scale(1.15); }
.color-preset.active { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-light); }

/* Logo Upload */
.logo-upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 1rem; text-align: center; cursor: pointer;
  transition: all var(--transition);
}
.logo-upload-area:hover { border-color: var(--primary); background: var(--primary-light); }
.logo-upload-area input[type="file"] { display: none; }
.logo-upload-area .upload-label {
  font-size: .85rem; color: var(--text-secondary); font-weight: 500;
}
.logo-preview { display: flex; align-items: center; gap: .75rem; margin-top: .5rem; }
.logo-preview img {
  width: 48px; height: 48px; object-fit: contain;
  border-radius: .375rem; border: 1px solid var(--border);
}

/* === Pricing === */
#pricing { padding: 5rem 1.5rem; text-align: center; }
#pricing h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem); font-weight: 800;
  margin-bottom: .5rem;
}
#pricing .pricing-subtitle { color: var(--text-secondary); margin-bottom: 3rem; font-size: 1.05rem; }
.pricing-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1rem; max-width: 1000px; margin: 0 auto;
}
.price-card {
  background: var(--surface); border-radius: var(--radius-xl);
  border: 1px solid var(--border-light); padding: 2rem 1.5rem;
  text-align: center; box-shadow: var(--shadow-sm);
  transition: all .3s ease; position: relative;
}
.price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.price-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 8px 32px rgba(79,70,229,.15);
}
.price-card.featured::before {
  content: attr(data-badge); position: absolute; top: -12px; left: 50%;
  transform: translateX(-50%); padding: .25rem .75rem; border-radius: 2rem;
  background: var(--gradient); color: #fff; font-size: .7rem; font-weight: 700;
  white-space: nowrap;
}
.price-badge {
  font-size: .7rem; font-weight: 700; text-transform: uppercase;
  color: var(--text-muted); letter-spacing: .1em; margin-bottom: .5rem;
}
.price-amount {
  font-size: 2.5rem; font-weight: 800; color: var(--text);
  line-height: 1.2;
}
.price-amount span { font-size: 1rem; font-weight: 500; color: var(--text-muted); }
.price-per-unit { font-size: .8rem; color: var(--text-muted); margin-bottom: 1.25rem; }
.price-features { list-style: none; margin-bottom: 1.5rem; text-align: left; }
.price-features li {
  padding: .35rem 0; font-size: .85rem; color: var(--text-secondary);
  display: flex; align-items: center; gap: .5rem;
}
.price-features .check { color: var(--success); font-weight: 700; }
.price-features .cross { color: var(--text-muted); }

/* === Features === */
#features {
  padding: 5rem 1.5rem; max-width: 1000px; margin: 0 auto;
}
#features h2 {
  text-align: center; font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800; margin-bottom: 3rem;
}
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.feature-card {
  text-align: center; padding: 2rem 1rem;
  border-radius: var(--radius-lg); transition: all var(--transition);
}
.feature-card:hover { background: var(--surface); box-shadow: var(--shadow); }
.feature-icon {
  font-size: 2rem; margin-bottom: .75rem;
  width: 56px; height: 56px; border-radius: 14px;
  background: var(--primary-light); display: inline-flex;
  align-items: center; justify-content: center;
}
.feature-card h3 { font-size: .95rem; font-weight: 700; margin-bottom: .35rem; }
.feature-card p { font-size: .8rem; color: var(--text-secondary); line-height: 1.5; }

/* === Footer === */
footer {
  padding: 2rem 1.5rem; text-align: center;
  border-top: 1px solid var(--border-light); color: var(--text-muted); font-size: .8rem;
}
footer .footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-top: .5rem; }
footer a { color: var(--text-muted); }
footer a:hover { color: var(--primary); }

/* === Modal === */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem; opacity: 1; transition: opacity .3s ease;
}
.modal.hidden { display: none; opacity: 0; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(15,23,42,.5); backdrop-filter: blur(4px);
}
.modal-content {
  position: relative; background: var(--surface);
  border-radius: var(--radius-xl); padding: 2rem;
  max-width: 440px; width: 100%; box-shadow: var(--shadow-lg);
  max-height: 90vh; overflow-y: auto;
  animation: modalIn .3s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(12px) scale(.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-close {
  position: absolute; top: 1rem; right: 1rem;
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; color: var(--text-muted);
  transition: all var(--transition);
}
.modal-close:hover { background: var(--surface-hover); color: var(--text); }
.modal-header { text-align: center; margin-bottom: 1.5rem; }
.modal-header h2 { font-size: 1.25rem; font-weight: 700; }

/* Payment Steps */
.payment-step { display: none; flex-direction: column; align-items: center; gap: 1rem; }
.payment-step.active { display: flex; }
.payment-step p { color: var(--text-secondary); font-size: .9rem; text-align: center; }
.promptpay-display {
  background: var(--surface-hover); padding: 1.5rem;
  border-radius: var(--radius); text-align: center; width: 100%;
}
.promptpay-display canvas { margin: 0 auto; }
.promptpay-id { font-weight: 600; color: var(--text); font-size: .85rem; }
.payment-amount {
  font-size: 2rem; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Slip Upload */
.slip-upload-zone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 2rem; text-align: center; cursor: pointer;
  transition: all var(--transition); width: 100%;
}
.slip-upload-zone:hover, .slip-upload-zone.drag-over {
  border-color: var(--primary); background: var(--primary-light);
}
.slip-upload-zone input[type="file"] { display: none; }
.slip-upload-zone .upload-icon { font-size: 2rem; margin-bottom: .5rem; }
.slip-preview-area { width: 100%; text-align: center; }
.slip-preview-area img {
  max-height: 200px; border-radius: var(--radius);
  border: 1px solid var(--border); margin: 0 auto;
}
.payment-email {
  width: 100%;
}
.payment-email label { display: block; font-size: .8rem; font-weight: 600; margin-bottom: .35rem; }
.payment-email input {
  width: 100%; padding: .65rem 1rem; border: 2px solid var(--border);
  border-radius: var(--radius); transition: border-color var(--transition);
}
.payment-email input:focus { outline: none; border-color: var(--primary); }

/* Spinner */
.spinner {
  width: 40px; height: 40px; border: 3px solid var(--border);
  border-top-color: var(--primary); border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Success */
.success-icon {
  width: 64px; height: 64px; border-radius: 50%;
  background: #ecfdf5; color: var(--success);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; font-weight: 700;
}

/* === Utilities === */
.hidden { display: none !important; }
.text-center { text-align: center; }

/* === Responsive === */
@media (max-width: 900px) {
  .editor-grid { grid-template-columns: 1fr; }
  .preview-panel { position: static; }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  #hero { padding: 3rem 1rem 2rem; }
  #hero h1 { font-size: 1.75rem; }
  .input-group { flex-direction: column; }
  .input-group .btn-generate { width: 100%; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 360px; }
  .features-grid { grid-template-columns: 1fr; }
  .type-tabs { gap: .25rem; }
  .type-tab { padding: .4rem .65rem; font-size: .75rem; }
  .style-grid { grid-template-columns: repeat(2, 1fr); }
  .editor-grid { gap: 1rem; }
  .modal-content { padding: 1.5rem; }
  .input-row { flex-direction: column; }
}