:root {
  --bg-color: #080b12;
  --surface-glass: rgba(18, 24, 38, 0.72);
  --surface-card: rgba(22, 30, 48, 0.6);
  --surface-hover: rgba(35, 48, 75, 0.6);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.5);
  --primary-accent: #38bdf8;
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --success-color: #10b981;
  --danger-color: #ef4444;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #64748b;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  min-height: 100dvh;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(2, 132, 199, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(147, 51, 234, 0.12) 0%, transparent 45%);
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-top);
  padding-bottom: calc(var(--safe-bottom) + 24px);
  overflow-x: hidden;
}

/* Header & Glass Navbar */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 11, 18, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-glass);
  padding: 16px 20px;
}

.header-container {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.35);
}

.brand-title {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 30%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

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

.btn-icon {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary-accent);
}

/* Main Container */
.main-content {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
}

/* Segmented Control / Tabs */
.segmented-control {
  display: flex;
  background: rgba(18, 24, 38, 0.8);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(16px);
  padding: 5px;
  border-radius: 16px;
  margin-bottom: 24px;
  gap: 6px;
}

.segment-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  background: transparent;
  border: none;
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.segment-btn.active {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.segment-btn svg {
  width: 18px;
  height: 18px;
}

/* Tab Panels */
.tab-panel {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Glass Card */
.glass-card {
  background: var(--surface-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3);
}

.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 12px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary-accent);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* Search Bar */
.search-wrapper {
  position: relative;
  width: 100%;
  margin-bottom: 16px;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 14px;
  transition: all 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-sub);
  pointer-events: none;
}

/* Mailbox Item Cards */
.item-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 768px) {
  .item-list.two-cols {
    grid-template-columns: repeat(2, 1fr);
  }
}

.item-card {
  background: var(--surface-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 18px;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.item-card:hover {
  background: var(--surface-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.item-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}

.item-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  word-break: break-all;
}

.item-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.item-category {
  font-size: 11px;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--text-muted);
}

.item-credentials-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin: 10px 0;
  font-size: 13px;
}

.cred-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
}

.cred-label {
  color: var(--text-sub);
  font-size: 11px;
  text-transform: uppercase;
}

.cred-value {
  font-family: ui-monospace, Menlo, Monaco, Consolas, monospace;
  color: #fff;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cred-password-hidden {
  letter-spacing: 2px;
}

/* Card Action Buttons */
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-glass);
  color: #fff;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
}

/* Form Styles */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .form-grid.two-cols {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.form-input, .form-select, .form-textarea {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: #fff;
  font-size: 14px;
  transition: all 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.input-with-button {
  display: flex;
  gap: 8px;
}

.input-with-button .form-input {
  flex: 1;
}

/* Checkbox */
.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-main);
  user-select: none;
}

.form-checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: #0284c7;
  cursor: pointer;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease-out;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-sheet {
  background: rgba(18, 24, 38, 0.95);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 100%;
  padding: 24px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.open .modal-sheet {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close:hover {
  color: #fff;
}

/* QR Code Container */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 16px 0;
  padding: 20px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.qr-image {
  width: 240px;
  height: 240px;
  border-radius: 12px;
  background: #000;
}

.qr-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
  text-align: center;
  line-height: 1.5;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 20px;
  left: 20px;
  max-width: 380px;
  margin: 0 auto;
  z-index: 200;
  pointer-events: none;
}

.toast {
  background: rgba(18, 24, 38, 0.9);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 12px 18px;
  margin-top: 8px;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  animation: slideUp 0.25s ease-out;
  pointer-events: auto;
}

.toast.success {
  border-color: rgba(16, 185, 129, 0.4);
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.4);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}