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

:root {
  --brand:          #4f46e5;
  --brand-hover:    #4338ca;
  --brand-light:    rgba(79, 70, 229, 0.1);
  --success:        #10b981;
  --danger:         #ef4444;
  --danger-hover:   #dc2626;
  --warning:        #f59e0b;
  --huawei:         #cf1322;

  --text:           #111827;
  --text-secondary: #6b7280;
  --text-light:     #9ca3af;
  --border:         #e5e7eb;
  --bg:             #f3f4f6;
  --card:           #ffffff;
  --input-bg:       #f9fafb;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:  0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg:  0 4px 6px rgba(0,0,0,0.07), 0 10px 30px rgba(0,0,0,0.10);

  --nav-height: 60px;
  --sidebar-w:  220px;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Navigation ───────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 1rem;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: -0.02em;
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo svg { flex-shrink: 0; }

.nav-btn {
  height: 34px;
  padding: 0 1rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.nav-btn:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-light);
}

.nav-btn.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.btn-new {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 5px;
}

.btn-new:hover {
  background: var(--brand-hover) !important;
  border-color: var(--brand-hover) !important;
  color: #fff !important;
}

/* ── Main Layout ──────────────────────────────────────────────────────────── */
.main {
  padding-top: calc(var(--nav-height) + 1.5rem);
  padding-bottom: 3rem;
  min-height: 100vh;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Page header ──────────────────────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.page-header h1 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 2px;
}

/* ── Card ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
}

/* ── QR Code Grid (list view) ─────────────────────────────────────────────── */
.qr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.qr-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  padding: 1.25rem;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.qr-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.qr-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.qr-card-name {
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.3;
}

.qr-card-client {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.qr-card-scan-count {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brand);
  line-height: 1;
}

.qr-card-scan-label {
  font-size: 0.7rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.qr-card-url {
  font-size: 0.75rem;
  color: var(--text-light);
  font-family: 'SF Mono', 'Fira Code', monospace;
  background: var(--input-bg);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 0.25rem;
}

.qr-card-stores {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 4px;
}

/* ── Store Badges ─────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: 99px;
  line-height: 1.4;
}

.badge-ios      { background: rgba(79,70,229,0.1);  color: var(--brand); }
.badge-android  { background: rgba(16,185,129,0.1); color: #059669; }
.badge-huawei   { background: rgba(207,19,34,0.1);  color: var(--huawei); }
.badge-desktop  { background: rgba(107,114,128,0.1);color: var(--text-secondary); }
.badge-client   { background: var(--bg); color: var(--text-secondary); border: 1px solid var(--border); }

/* ── Empty state ──────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.empty-state svg {
  color: var(--text-light);
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.empty-state p {
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

/* ── Form view ────────────────────────────────────────────────────────────── */
.form-card {
  max-width: 580px;
  margin: 0 auto;
}

.form-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin: 1.25rem 0 0.75rem;
}

.form-section-title:first-child { margin-top: 0; }

.field-group { margin-bottom: 1rem; }

label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text);
}

label .optional {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-light);
  margin-left: 5px;
}

.input-wrap {
  position: relative;
}

.input-wrap .icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  pointer-events: none;
}

input[type="text"],
input[type="url"] {
  width: 100%;
  height: 42px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
  font-size: 0.875rem;
  color: var(--text);
  padding: 0 12px 0 38px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

input[type="text"]:focus,
input[type="url"]:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
  background: #fff;
}

input.is-error {
  border-color: var(--danger);
}

input.is-error:focus {
  box-shadow: 0 0 0 3px rgba(239,68,68,0.12);
}

.field-error {
  display: block;
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 0.3rem;
  min-height: 1em;
}

.form-error-banner {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  color: var(--danger);
  font-size: 0.8125rem;
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.btn-primary:hover {
  background: var(--brand-hover);
  border-color: var(--brand-hover);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: #9ca3af;
  color: var(--text);
  background: var(--input-bg);
}

.btn-danger {
  background: #fff;
  color: var(--danger);
  border-color: #fca5a5;
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
  padding: 0 0.5rem;
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--bg);
}

.btn-sm {
  height: 32px;
  padding: 0 0.875rem;
  font-size: 0.8125rem;
}

.btn-full { width: 100%; }

/* ── Back button ──────────────────────────────────────────────────────────── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  margin-bottom: 1.25rem;
  transition: color 0.15s;
}

.back-btn:hover { color: var(--brand); }

/* ── Detail view ──────────────────────────────────────────────────────────── */
.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.detail-title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.detail-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 3px;
}

.detail-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ── Stat cards ───────────────────────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  padding: 1rem 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.3rem;
  color: var(--text);
}

.stat-card.total .stat-value  { color: var(--brand); }
.stat-card.ios .stat-value    { color: var(--brand); }
.stat-card.android .stat-value{ color: var(--success); }
.stat-card.huawei .stat-value { color: var(--huawei); }
.stat-card.desktop .stat-value{ color: var(--text-secondary); }

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
}

/* ── Charts ───────────────────────────────────────────────────────────────── */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.chart-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  padding: 1.25rem;
}

.chart-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.chart-wrap {
  position: relative;
}

.chart-wrap canvas { width: 100% !important; }

/* ── QR Generator section (in detail view) ───────────────────────────────── */
.qr-gen-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.qr-gen-inner {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.qr-preview-box {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  min-height: 120px;
}

.qr-preview-box img,
.qr-preview-box canvas {
  display: block;
}

.qr-gen-controls {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.qr-scan-url {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  word-break: break-all;
}

.size-selector {
  display: flex;
  gap: 0.4rem;
}

.size-chip {
  flex: 1;
  padding: 5px 0;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
}

.size-chip.active {
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-light);
}

.size-hint {
  font-size: 0.72rem;
  color: var(--text-light);
}

/* ── Danger zone ──────────────────────────────────────────────────────────── */
.danger-zone {
  background: #fff5f5;
  border: 1.5px solid #fecaca;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.danger-zone-text h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--danger);
}

.danger-zone-text p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ── Toast notification ───────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--text);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: toastIn 0.2s ease;
  max-width: 320px;
}

.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Loading spinner ──────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(79,70,229,0.2);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

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

.loading-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

/* ── Warning banner ───────────────────────────────────────────────────────── */
.warn-banner {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  color: #92400e;
  font-size: 0.8rem;
  padding: 0.6rem 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

/* ── Archive notice ───────────────────────────────────────────────────────── */
.archive-notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  color: #92400e;
  font-size: 0.8125rem;
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
}

.archive-notice svg { flex-shrink: 0; margin-top: 1px; }

/* ── Archived QR card ─────────────────────────────────────────────────────── */
.qr-card.archived {
  opacity: 0.7;
  border-style: dashed;
  cursor: default;
}

.qr-card.archived:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: none;
}

.archived-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(107,114,128,0.1);
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.archived-date {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
  .charts-grid { grid-template-columns: 1fr; }
  .qr-gen-inner { flex-direction: column; }
}

@media (max-width: 540px) {
  .container { padding: 0 1rem; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .qr-grid { grid-template-columns: 1fr; }
  .nav { padding: 0 1rem; }
  .detail-header { flex-direction: column; }
}