:root {
  /* Dynamic TG Colors fallback to modern aesthetic defaults */
  --tg-bg: var(--tg-theme-bg-color, #f7f8fa);
  --tg-section: var(--tg-theme-section-bg-color, #ffffff);
  --tg-secondary: var(--tg-theme-secondary-bg-color, #eff1f5);
  --tg-text: var(--tg-theme-text-color, #1a1a1c);
  --tg-hint: var(--tg-theme-hint-color, #8b8d96);
  --tg-button: var(--tg-theme-button-color, #4f46e5);
  --tg-button-text: var(--tg-theme-button-text-color, #ffffff);
  --tg-header: var(--tg-theme-header-bg-color, rgba(255, 255, 255, 0.85));

  /* Custom Aesthetics */
  --accent: var(--tg-button);
  --accent-glow: rgba(79, 70, 229, 0.25);
  --hairline: rgba(0, 0, 0, 0.06);
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  
  --radius-card: 20px;
  --radius-button: 14px;
  --radius-input: 12px;
  
  --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --tg-bg: var(--tg-theme-bg-color, #121214);
    --tg-section: var(--tg-theme-section-bg-color, #1c1c1f);
    --tg-secondary: var(--tg-theme-secondary-bg-color, #27272a);
    --tg-text: var(--tg-theme-text-color, #f4f4f5);
    --tg-hint: var(--tg-theme-hint-color, #a1a1aa);
    --tg-header: var(--tg-theme-header-bg-color, rgba(18, 18, 20, 0.85));
    --hairline: rgba(255, 255, 255, 0.08);
    --accent-glow: rgba(79, 70, 229, 0.4);
    --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

/* Glassmorphism variables for light/dark */
:root {
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.4);
}
@media (prefers-color-scheme: dark) {
  :root {
    --glass-bg: rgba(30, 30, 32, 0.65);
    --glass-border: rgba(255, 255, 255, 0.1);
  }
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", sans-serif;
  background: var(--tg-bg);
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(79, 70, 229, 0.08), transparent 50%),
    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.08), transparent 50%);
  background-attachment: fixed;
  color: var(--tg-text);
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  letter-spacing: -0.01em;
}

body {
  padding-bottom: calc(84px + env(safe-area-inset-bottom));
}

.hidden { display: none !important; }

.center {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  color: var(--tg-hint);
  font-size: 15px;
  font-weight: 500;
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ============ TOP BAR ============ */
#topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--tg-header);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  padding: 16px 20px calc(16px + env(safe-area-inset-top));
  padding-top: calc(16px + env(safe-area-inset-top));
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--hairline);
  transition: all 0.3s ease;
}

.shop-name {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.03em;
}

.role-badge {
  background: rgba(79, 70, 229, 0.1);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(79, 70, 229, 0.15);
}

#content {
  padding: 20px;
  max-width: 600px;
  margin: 0 auto;
  animation: fadeUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ============ TYPOGRAPHY ============ */
h2 {
  margin: 10px 4px 20px;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

h3 {
  margin: 24px 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--tg-hint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.muted {
  color: var(--tg-hint);
  font-size: 13px;
}

.imei {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--tg-hint);
  background: var(--tg-bg);
  padding: 2px 6px;
  border-radius: 6px;
  letter-spacing: 0;
}

.price {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.profit-positive { color: var(--success); }
.profit-negative { color: var(--danger); }

/* ============ CARDS ============ */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--glass-border);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1); /* Spring animation */
}

.card-title {
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.card-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--tg-hint);
  padding: 8px 0;
}

.card.clickable {
  cursor: pointer;
}

.card.clickable:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.card.clickable:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-soft);
}

/* Inventory list card */
.inv-card {
  display: flex;
  gap: 16px;
  align-items: center;
}

.inv-thumb {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: var(--tg-secondary);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--tg-hint);
  overflow: hidden;
  border: 1px solid var(--hairline);
}

.inv-thumb img,
.inv-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.inv-body {
  flex: 1;
  min-width: 0;
}

.inv-title {
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inv-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--tg-hint);
  align-items: center;
}

.inv-meta .price {
  font-size: 15px;
  color: var(--tg-text);
  background: var(--tg-secondary);
  padding: 2px 8px;
  border-radius: 8px;
}

.empty {
  text-align: center;
  color: var(--tg-hint);
  padding: 80px 20px;
  font-size: 15px;
  font-weight: 500;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
  filter: grayscale(100%);
}

/* ============ FORMS ============ */
.form-group {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-radius: var(--radius-card);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--glass-border);
}

.form-row {
  display: flex;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--hairline);
  gap: 16px;
}

.form-row:last-child {
  border-bottom: none;
}

.form-row label {
  flex: 0 0 100px;
  color: var(--tg-text);
  font-size: 15px;
  margin: 0;
  font-weight: 500;
}

.form-row input,
.form-row select {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0;
  font-size: 15px;
  color: var(--tg-text);
  text-align: right;
  font-family: inherit;
  font-weight: 500;
  outline: none;
}

.form-row input::placeholder {
  color: var(--tg-hint);
  font-weight: 400;
}

.form-row.col {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.form-row.col label {
  flex: none;
  font-size: 13px;
  color: var(--tg-hint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.form-row.col input,
.form-row.col select,
.form-row.col textarea {
  text-align: left;
  background: var(--tg-bg);
  padding: 12px 16px;
  border-radius: 10px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--tg-hint);
  margin-bottom: 8px;
  margin-top: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input, select, textarea {
  width: 100%;
  padding: 16px 20px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-input);
  font-size: 15px;
  background: var(--tg-section);
  color: var(--tg-text);
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ============ BUTTONS ============ */
button {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--accent) 0%, #6366f1 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 16px;
  letter-spacing: 0.01em;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: inherit;
  box-shadow: 0 4px 14px var(--accent-glow);
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

button:active:not(:disabled) {
  transform: scale(0.97);
  box-shadow: 0 2px 8px var(--accent-glow);
}

button:disabled {
  background: var(--tg-secondary);
  color: var(--tg-hint);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

button.secondary {
  background: var(--tg-secondary);
  color: var(--tg-text);
  box-shadow: none;
}

button.secondary:hover:not(:disabled) {
  background: var(--hairline);
  transform: translateY(-1px);
}

button.danger {
  background: linear-gradient(135deg, var(--danger) 0%, #f87171 100%);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.25);
}

button.danger:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.35);
}

button.ghost {
  background: transparent;
  color: var(--accent);
  box-shadow: none;
  padding: 12px;
}

button.ghost:hover {
  background: rgba(79, 70, 229, 0.05);
  transform: none;
}

.btn-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.btn-row button {
  margin-top: 0;
}

/* ============ SEARCH ============ */
.search-bar {
  position: sticky;
  top: 66px;
  z-index: 5;
  margin: -20px -20px 16px;
  padding: 12px 20px;
  background: var(--tg-bg);
  backdrop-filter: blur(10px);
}

.search-input-wrap {
  position: relative;
}

.search-input-wrap::before {
  content: "🔍";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  opacity: 0.4;
  pointer-events: none;
}

.search-bar input {
  background: var(--tg-section);
  border-radius: 14px;
  padding: 14px 16px 14px 40px;
  font-size: 15px;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-soft);
}

.search-bar input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ============ STATS ============ */
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.stat-card {
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
}

.stat-card:hover {
  transform: scale(1.02);
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 100%);
  pointer-events: none;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-top: 4px;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--tg-text) 0%, var(--tg-hint) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 12px;
  color: var(--tg-hint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

/* ============ SEGMENTED CONTROL ============ */
.segmented {
  display: flex;
  background: var(--tg-secondary);
  border-radius: 12px;
  padding: 4px;
  gap: 4px;
  margin-bottom: 20px;
  border: 1px solid var(--hairline);
}

.segmented .seg {
  flex: 1;
  padding: 10px 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--tg-hint);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.segmented .seg:hover {
  color: var(--tg-text);
}

.segmented .seg.active {
  background: var(--tg-section);
  color: var(--tg-text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* ============ BOTTOM TAB BAR ============ */
#tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--tg-header);
  backdrop-filter: saturate(180%) blur(24px);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-around;
  padding: 10px 0 calc(10px + env(safe-area-inset-bottom));
  z-index: 10;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.02);
}

#tabbar .tab-btn {
  flex: 1;
  text-align: center;
  padding: 6px;
  border: none;
  background: none;
  color: var(--tg-hint);
  cursor: pointer;
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.2s ease;
  position: relative;
}

#tabbar .tab-btn .icon {
  display: block;
  font-size: 24px;
  margin-bottom: 4px;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

#tabbar .tab-btn.active {
  color: var(--accent);
}

#tabbar .tab-btn.active .icon {
  transform: translateY(-2px) scale(1.1);
}

#tabbar .tab-btn:active {
  opacity: 0.7;
}

/* ============ BADGES ============ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-top: 8px;
  text-transform: uppercase;
}

.badge.green { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge.red { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge.gray { background: var(--tg-secondary); color: var(--tg-hint); }
.badge.blue { background: rgba(79, 70, 229, 0.15); color: var(--accent); }

/* ============ MEDIA UPLOAD ============ */
.media-uploader {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.media-pick-btn {
  flex: 1;
  min-width: 140px;
  padding: 24px;
  background: var(--tg-secondary);
  border: 2px dashed var(--hairline);
  border-radius: var(--radius-card);
  color: var(--tg-hint);
  cursor: pointer;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
  margin: 0;
}

.media-pick-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(79, 70, 229, 0.05);
}

.media-pick-btn .icon {
  display: block;
  font-size: 32px;
  margin-bottom: 8px;
}

.media-preview {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--tg-secondary);
  aspect-ratio: 1.5 / 1;
  margin-bottom: 12px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--hairline);
}

.media-preview img,
.media-preview video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-remove {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  margin: 0;
  padding: 0;
  border: none;
  transition: transform 0.2s ease;
}

.media-remove:hover {
  transform: scale(1.1);
  background: rgba(239, 68, 68, 0.8);
}

.media-progress {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 15px;
}

/* ============ ITEM DETAIL HERO ============ */
.item-hero {
  margin: -20px -20px 20px;
  background: var(--tg-secondary);
  aspect-ratio: 1.6 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  color: var(--tg-hint);
  overflow: hidden;
  position: relative;
}

.item-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0; height: 30%;
  background: linear-gradient(to top, var(--tg-bg), transparent);
}

.item-hero img,
.item-hero video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============ TOAST ============ */
.toast {
  position: fixed;
  bottom: 110px;
  left: 50%;
  transform: translateX(-50%) translateY(20px) scale(0.9);
  background: rgba(20, 20, 22, 0.95);
  color: white;
  padding: 14px 24px;
  border-radius: 100px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 14px;
  font-weight: 600;
  z-index: 100;
  max-width: 90%;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255,255,255,0.1);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}

.toast.error {
  background: rgba(239, 68, 68, 0.95);
  box-shadow: 0 10px 40px rgba(239, 68, 68, 0.3);
}

.toast.success {
  background: rgba(16, 185, 129, 0.95);
  box-shadow: 0 10px 40px rgba(16, 185, 129, 0.3);
}

/* ============ BACK BUTTON ============ */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  background: transparent;
  border: none;
  padding: 8px 0;
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px;
  width: auto;
  cursor: pointer;
  letter-spacing: -0.01em;
  transition: opacity 0.2s ease;
  box-shadow: none;
}

.back-btn:hover {
  opacity: 0.8;
  transform: translateX(-2px);
  box-shadow: none;
}

/* ============ HIDDEN FILE INPUTS ============ */
input[type="file"] {
  display: none;
}