:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #e0e7ff;
  --accent: #8b5cf6;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --card: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 32px rgba(99,102,241,.15);
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color: #fff;
  padding: 56px 24px 48px;
  text-align: center;
}
.hero-icon { font-size: 3rem; margin-bottom: 12px; display:flex; justify-content:center; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; margin-bottom: 8px; }
.hero p { font-size: 1.05rem; opacity: .85; max-width: 480px; margin: 0 auto; }

/* ── Layout ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 8px;
  margin: 36px 0 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  width: fit-content;
  box-shadow: var(--shadow);
}
.tab-btn {
  padding: 10px 28px;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: all .2s;
}
.tab-btn:hover { color: var(--primary); background: var(--primary-light); }
.tab-btn.active { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(99,102,241,.35); }

/* ── Tab content ── */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Grid ── */
.card-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 24px;
  align-items: start;
  padding-bottom: 60px;
}
@media (max-width: 820px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ── Cards ── */
.form-card, .preview-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.form-card h2, .preview-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
}

/* ── Tab description ── */
.tab-description {
  background: var(--primary-light);
  border: 1.5px solid #c7d2fe;
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: .9rem;
  color: #3730a3;
  line-height: 1.6;
  margin-bottom: 24px;
}

/* ── Form elements ── */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}
input[type="text"],
input[type="url"],
input[type="email"],
input[type="tel"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}
textarea { resize: vertical; min-height: 80px; }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }

.checkbox-label { display: flex; align-items: center; gap: 8px; font-size: .9rem; cursor: pointer; }
.checkbox-label input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }

/* ── Misc helpers ── */
.optional-tag {
  font-size: .75rem;
  font-weight: 400;
  color: var(--text-muted);
  background: #f1f5f9;
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 4px;
}
.field-hint { font-size: .8rem; color: var(--text-muted); margin-top: 4px; display: block; }

/* ── QR Type Buttons ── */
.type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.type-btn {
  padding: 9px 6px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .85rem;
  font-weight: 500;
  cursor: pointer;
  background: #fff;
  color: var(--text-muted);
  transition: all .2s;
  text-align: center;
}
.type-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.type-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }

/* ── Type fields ── */
.type-fields { display: none; }
.type-fields.active { display: block; }

/* ── Dot Style Grid ── */
.dot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.dot-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px 8px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .78rem;
  font-weight: 500;
  cursor: pointer;
  background: #fff;
  color: var(--text-muted);
  transition: all .2s;
}
.dot-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.dot-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }
.dot-btn.active .dot-preview { background: #fff; }

.dot-btn svg { display: block; flex-shrink: 0; }

/* ── Reset colors button ── */
.btn-reset-colors {
  background: none;
  border: none;
  font-size: .75rem;
  font-family: inherit;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 6px;
  vertical-align: middle;
  transition: color .2s, background .2s;
}
.btn-reset-colors:hover { color: var(--primary); background: var(--primary-light); }

/* ── Container Shape ── */
.shape-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.shape-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px 8px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .78rem;
  font-weight: 500;
  cursor: pointer;
  background: #fff;
  color: var(--text-muted);
  transition: all .2s;
}
.shape-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.shape-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }
.shape-btn svg { display: block; }

/* ── Colors ── */
.color-row { display: flex; gap: 16px; }
.color-item {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color .2s;
}
.color-item:hover { border-color: var(--primary); }
.color-item input[type="color"] {
  width: 36px;
  height: 36px;
  padding: 2px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  background: none;
}
.color-item input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
  border-radius: 5px;
}
.color-item input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 5px;
}
.color-item input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: 5px;
}
.color-item span { font-size: .85rem; color: var(--text-muted); font-weight: 500; }

/* ── Edge Line ── */
.edge-line-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.edge-enable-label {
  display: flex; align-items: center; gap: 6px;
  cursor: pointer; font-size: .9rem; color: var(--text); user-select: none;
}
.edge-enable-label input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--primary); cursor: pointer; }
.edge-line-controls {
  display: none; align-items: center; gap: 12px; flex-wrap: wrap;
}
.edge-line-controls.visible { display: flex; }
.edge-line-controls input[type="color"] {
  width: 36px; height: 36px; padding: 2px;
  border: 1.5px solid var(--border); border-radius: 6px; cursor: pointer;
}
.edge-width-label {
  display: flex; align-items: center; gap: 6px;
  font-size: .85rem; color: var(--text-muted);
}
.edge-width-label input[type="range"] { width: 100px; accent-color: var(--primary); }

/* ── Frame text style row ── */
.frame-text-style {
  display: flex; align-items: center; gap: 12px; margin-top: 10px; flex-wrap: wrap;
}
.font-select {
  flex: 1; min-width: 130px;
  padding: 7px 10px; border: 1.5px solid var(--border); border-radius: 8px;
  font-size: .875rem; color: var(--text); background: var(--card); cursor: pointer;
  transition: border-color .2s;
}
.font-select:focus { outline: none; border-color: var(--primary); }

/* ── Effect grid ── */
.effect-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.effect-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px 8px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .78rem;
  font-weight: 500;
  cursor: pointer;
  background: #fff;
  color: var(--text-muted);
  transition: all .2s;
}
.effect-btn svg { display: block; flex-shrink: 0; }
.effect-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.effect-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }

/* ── Upload zone ── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  background: var(--bg);
  position: relative;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
}
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  border: none;
  background: none;
  box-shadow: none;
  padding: 0;
}
.upload-zone input[type="file"]:focus { box-shadow: none; }
.upload-icon { font-size: 2rem; margin-bottom: 6px; }
.upload-zone p { font-size: .875rem; color: var(--text-muted); }
.upload-zone small { font-size: .8rem; color: var(--text-muted); opacity: .7; }

.logo-preview-row {
  display: none;
  align-items: center;
  gap: 12px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
}
.logo-preview-row.visible { display: flex; }
.logo-preview-row img { width: 48px; height: 48px; object-fit: contain; border-radius: 6px; border: 1px solid var(--border); }
.logo-preview-row span { flex: 1; font-size: .875rem; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.btn-remove {
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background .2s;
}
.btn-remove:hover { background: #fee2e2; }

/* ── Buttons ── */
.btn-primary {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .1s, box-shadow .2s;
  box-shadow: 0 4px 14px rgba(99,102,241,.4);
  margin-top: 8px;
}
.btn-primary:hover { opacity: .9; box-shadow: 0 6px 20px rgba(99,102,241,.5); }
.btn-primary:active { transform: scale(.99); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; }

.btn-download {
  width: 100%;
  padding: 12px;
  background: #fff;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 10px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  margin-top: 16px;
  display: none;
}
.btn-download:hover { background: var(--primary); color: #fff; }
.btn-download.visible { display: block; }

/* ── QR Preview ── */
.qr-preview {
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  border-radius: 12px;
  background: var(--bg);
  overflow: hidden;
  transition: border-color .3s;
}
.qr-preview.has-image { border-style: solid; border-color: var(--border); }
.qr-preview img {
  width: 100%;
  max-width: 280px;
  display: block;
  background-image: linear-gradient(45deg, #cbd5e1 25%, transparent 25%),
    linear-gradient(-45deg, #cbd5e1 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #cbd5e1 75%),
    linear-gradient(-45deg, transparent 75%, #cbd5e1 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0px;
  background-color: #f1f5f9;
}
.preview-placeholder { text-align: center; padding: 32px; }
.preview-placeholder .preview-icon { font-size: 3rem; opacity: .3; margin-bottom: 12px; }
.preview-placeholder p { font-size: .9rem; color: var(--text-muted); }

/* ── Spinner ── */
.spinner {
  width: 20px; height: 20px;
  border: 2.5px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result info box (dynamic) ── */
.result-box {
  display: none;
  margin-top: 20px;
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  border-radius: 10px;
  padding: 16px;
}
.result-box.visible { display: block; }
.result-box h3 { font-size: .9rem; font-weight: 600; color: #166534; margin-bottom: 12px; }

.copy-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.copy-row:last-child { margin-bottom: 0; }
.copy-row label { font-size: .78rem; font-weight: 600; color: var(--text-muted); width: 56px; flex-shrink: 0; }
.copy-input {
  flex: 1;
  min-width: 0;
  font-size: .8rem;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: text;
  outline: none;
}
.btn-copy {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background .2s;
}
.btn-copy:hover { background: var(--primary-dark); }
.btn-copy.copied { background: #22c55e; }

/* ── Divider ── */
.divider { height: 1px; background: var(--border); margin: 20px 0; }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 32px 24px;
  font-size: .85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 24px;
}
.visitor-count {
  margin-top: 8px;
  font-size: .8rem;
  color: var(--text-muted);
  opacity: .7;
}

/* ── Manage page ── */
.manage-hero {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color: #fff;
  padding: 40px 24px 36px;
  text-align: center;
}
.manage-hero a { color: rgba(255,255,255,.75); text-decoration: none; font-size: .9rem; }
.manage-hero a:hover { color: #fff; }
.manage-hero h1 { font-size: 1.6rem; font-weight: 700; margin: 12px 0 6px; }
.manage-hero p { opacity: .8; font-size: .95rem; }

.manage-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  padding: 36px 0 60px;
}
@media (max-width: 720px) { .manage-grid { grid-template-columns: 1fr; } }

.stat-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--border); }
.stat-row:last-child { border-bottom: none; }
.stat-label { font-size: .875rem; color: var(--text-muted); }
.stat-value { font-size: .95rem; font-weight: 600; }
.stat-count { font-size: 1.8rem; font-weight: 700; color: var(--primary); }

.alert { padding: 12px 16px; border-radius: 8px; font-size: .875rem; margin-top: 12px; display: none; }
.alert.success { background: #f0fdf4; border: 1px solid #86efac; color: #166534; display: block; }
.alert.error { background: #fef2f2; border: 1px solid #fca5a5; color: #991b1b; display: block; }