/* =======================================================
   KSP Inventory — Stylesheet
   Theme: Dark Slate + Teal Accent
   สีเข้มสวยงาม ดูทันสมัย เน้นใช้งานง่าย
======================================================= */

/* ─── Theme Variables ─── */
:root {
  --bg: #0f172a;
  --bg-light: #1e293b;
  --paper: #1e293b;
  --paper-hover: #273548;
  --ink: #e2e8f0;
  --ink-light: #f1f5f9;
  --muted: #94a3b8;
  --line: #334155;
  --chip: #334155;
  --accent: #14b8a6;
  --accent-light: rgba(20, 184, 166, .15);
  --accent-hover: #0d9488;
  --accent-glow: rgba(20, 184, 166, .25);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .3);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, .2);
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, .15);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, .15);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, .15);
  --font: 'Noto Sans Thai', 'Inter', system-ui, -apple-system, sans-serif;
  --transition: .2s ease;
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  font: 15px/1.65 var(--font);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ─── Screens ─── */
.screen { display: none; }
.screen.active { display: flex; flex-direction: column; min-height: 100vh; }

/* ─── Login Screen ─── */
#login-screen {
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #0f172a 0%, #1a2744 50%, #0f172a 100%);
  padding: 20px;
}

.login-card {
  width: min(420px, 94vw);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow), 0 0 80px rgba(20, 184, 166, .08);
  padding: 36px 28px;
  text-align: center;
  animation: fadeUp .5s ease;
}

.login-logo { margin-bottom: 12px; }

.login-card h1 {
  margin: 8px 0 4px;
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}

.login-sub {
  color: var(--muted);
  margin: 0 0 24px;
  font-size: 14px;
}

.login-footer {
  margin-top: 16px;
  font-size: 12px;
  color: var(--muted);
}

#google-signin-btn {
  display: flex;
  justify-content: center;
  min-height: 44px;
}

/* ─── App Header ─── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 12px rgba(0, 0, 0, .3);
  backdrop-filter: blur(10px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-title {
  font-weight: 700;
  font-size: 17px;
  color: var(--accent);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--chip);
  padding: 4px 12px 4px 4px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: background var(--transition);
}
.user-chip:hover { background: var(--paper-hover); }

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--line);
}

.user-dropdown-container { position: relative; }

.dropdown-arrow {
  font-size: 10px;
  color: var(--muted);
  margin-left: 2px;
  transition: transform var(--transition);
}

.user-dropdown-container.active .dropdown-arrow { transform: rotate(180deg); }

.user-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius-sm);
  min-width: 160px;
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 100;
}

.user-dropdown-container.active .user-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
}
.dropdown-item:hover { background: var(--bg); }
.text-danger { color: var(--danger); }
.text-danger:hover { background: var(--danger-bg); color: #fca5a5; }

/* ─── Tabs ─── */
.nav-tabs {
  display: flex;
  gap: 4px;
  background: var(--paper);
  padding: 6px;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
}

.nav-tab {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: all var(--transition);
}
.nav-tab:hover { background: var(--bg); color: var(--ink); }
.nav-tab.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.view-content { display: none; flex-direction: column; gap: 16px; animation: fadeUp .3s ease; }
.view-content.active { display: flex; }

/* ─── Main Layout ─── */
.app-main {
  flex: 1;
  padding: 16px;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ─── Card ─── */
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  transition: all var(--transition);
}
.card:hover { border-color: rgba(20, 184, 166, .3); }

/* ─── Search Bar ─── */
.search-container {
  position: relative;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  color: var(--muted);
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: 12px 14px 12px 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  outline: none;
  transition: all var(--transition);
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.search-input::placeholder { color: var(--muted); }

/* ─── Filter Bar ─── */
.filter-bar {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.filter-select {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  outline: none;
  cursor: pointer;
}
.filter-select:focus { border-color: var(--accent); }

.scan-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-light);
  color: var(--accent);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.scan-btn:hover {
  background: var(--accent);
  color: #fff;
}

/* ─── Product Card (List) ─── */
.product-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.product-card {
  display: flex;
  gap: 12px;
  padding: 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.product-card:hover {
  border-color: var(--accent);
  background: var(--paper-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, .2);
}
.product-card.selected {
  border-color: var(--accent);
  background: var(--accent-light);
}

.product-thumb {
  width: 64px;
  height: 64px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}
.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info { flex: 1; min-width: 0; }
.product-code {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.product-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.product-desc {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}
.product-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 6px;
  flex-wrap: wrap;
}

.stock-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
}
.stock-badge.in-stock { background: var(--success-bg); color: var(--success); }
.stock-badge.low-stock { background: var(--warning-bg); color: var(--warning); }
.stock-badge.no-stock { background: var(--danger-bg); color: var(--danger); }

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(99, 102, 241, .15);
  color: #818cf8;
}
.tag-chip .tag-remove {
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  opacity: .7;
  transition: opacity var(--transition);
}
.tag-chip .tag-remove:hover { opacity: 1; }

.no-detail-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 999px;
  background: var(--warning-bg);
  color: var(--warning);
}

/* ─── Form Elements ─── */
.form-row { margin-bottom: 14px; }
.form-row:last-child { margin-bottom: 0; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-input::placeholder { color: var(--muted); }

textarea.form-input {
  min-height: 100px;
  resize: vertical;
}

/* ─── Image Grid ─── */
.image-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.image-thumb {
  position: relative;
  width: 100px;
  height: 100px;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid var(--line);
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
}
.image-thumb:hover { border-color: var(--accent); }
.image-thumb.main-image { border-color: var(--accent); }
.image-thumb.main-image::after {
  content: '★';
  position: absolute;
  top: 4px;
  left: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.image-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-actions {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity var(--transition);
}
.image-thumb:hover .image-actions { opacity: 1; }

.img-action-btn {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, .65);
  color: #fff;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.img-action-btn:hover { background: rgba(0, 0, 0, .85); }
.img-action-btn.delete:hover { background: var(--danger); }

.upload-card {
  width: 100px;
  height: 100px;
  border: 2px dashed var(--line);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}
.upload-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}
.upload-card .upload-icon { font-size: 24px; }

/* ─── Tag Input ─── */
.tag-input-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  min-height: 42px;
  align-items: center;
  cursor: text;
  transition: border-color var(--transition);
}
.tag-input-container:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.tag-input-field {
  flex: 1;
  min-width: 100px;
  border: none;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  outline: none;
}
.tag-input-field::placeholder { color: var(--muted); }

/* ─── Edit Panel ─── */
.edit-panel {
  border-top: 2px solid var(--accent);
  background: var(--paper);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 20px;
  margin-top: -1px;
}

.edit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.edit-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .5; cursor: default; transform: none; }

.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; width: 100%; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 16px var(--accent-glow); }

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-accent:hover { box-shadow: 0 6px 24px var(--accent-glow); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 5px 12px;
  font-size: 12px;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-danger {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 5px 12px;
  font-size: 12px;
}
.btn-danger:hover { background: var(--danger-bg); }

/* ─── Section Header ─── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.section-header h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 40px 16px;
  color: var(--muted);
}
.empty-icon { font-size: 48px; margin-bottom: 8px; opacity: .5; }
.empty-state p { margin: 0; font-size: 14px; }

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--ink);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4);
  z-index: 999;
  opacity: 0;
  transition: all .35s cubic-bezier(.22, .68, 0, 1.1);
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.toast.error { background: var(--danger); color: #fff; }
.toast.success { background: var(--success); color: #fff; }

/* ─── Modal ─── */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, .75);
  z-index: 9999;
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(4px);
}
.modal-overlay.active { display: flex; }

.modal-content {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  max-width: 500px;
  width: 92%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
  animation: fadeUp .3s ease;
}
.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}
.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--muted);
  cursor: pointer;
}
.modal-body { padding: 20px; }

/* ─── Scanner Overlay ─── */
.scanner-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: #000;
  z-index: 10000;
  flex-direction: column;
}
.scanner-overlay.active { display: flex; }
.scanner-video {
  flex: 1;
  object-fit: cover;
  width: 100%;
}
.scanner-bar {
  padding: 16px;
  background: var(--bg);
  display: flex;
  gap: 8px;
  align-items: center;
}
.scanner-bar input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  outline: none;
}

/* ─── Loading Spinner ─── */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  display: inline-block;
}

/* ─── Animations ─── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .app-main { padding: 12px; gap: 12px; }
  .card { padding: 14px; }
  .login-card { padding: 28px 18px; }
  .user-chip span { display: none; }
  .product-thumb { width: 56px; height: 56px; }
  .image-thumb { width: 80px; height: 80px; }
  .upload-card { width: 80px; height: 80px; }
}

@media (min-width: 768px) {
  .app-main { padding: 24px; gap: 20px; }
}