/* ============================================
   Design Tokens & Variables
   ============================================ */
:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #161625;
  --bg-card: rgba(26, 26, 46, 0.85);
  --bg-card-hover: rgba(32, 32, 58, 0.92);
  --bg-glass: rgba(255, 255, 255, 0.04);

  --text-primary: #e8e8f0;
  --text-secondary: #9e9eb8;
  --text-muted: #6b6b85;

  --accent-1: #6c63ff;
  --accent-2: #a855f7;
  --accent-3: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #6c63ff 0%, #a855f7 50%, #38bdf8 100%);
  --accent-glow: 0 0 20px rgba(108, 99, 255, 0.3);

  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;

  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(108, 99, 255, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 4px 20px rgba(108, 99, 255, 0.15);

  --font-main: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, rgba(108, 99, 255, 0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(168, 85, 247, 0.06) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 50%, rgba(56, 189, 248, 0.04) 0%, transparent 60%);
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   App Container
   ============================================ */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px 40px;
}

/* ============================================
   Header
   ============================================ */
.app-header {
  padding: 20px 0 12px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(15, 15, 26, 0.75);
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-icon {
  font-size: 28px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.logo h1 {
  font-size: 1.35rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.btn-icon {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border-color);
  background: var(--bg-glass);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.btn-icon:hover {
  border-color: var(--border-hover);
  color: var(--accent-1);
  background: rgba(108, 99, 255, 0.08);
  box-shadow: var(--shadow-glow);
  transform: rotate(30deg);
}

/* ============================================
   Tab Switcher
   ============================================ */
.tab-container {
  padding: 8px 0 16px;
  position: sticky;
  top: 68px;
  z-index: 99;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
}

.tab-switcher {
  display: flex;
  position: relative;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 4px;
  gap: 4px;
}

.tab-btn {
  flex: 1;
  padding: 12px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  position: relative;
  z-index: 2;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.tab-btn.active {
  color: #fff;
}

.tab-btn:hover:not(.active) {
  color: var(--text-primary);
}

.tab-icon {
  font-size: 1rem;
}

.tab-indicator {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 6px);
  height: calc(100% - 8px);
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  transition: transform var(--transition-smooth);
  z-index: 1;
  box-shadow: var(--accent-glow);
}

.tab-indicator.right {
  transform: translateX(calc(100% + 4px));
}

/* ============================================
   Content Area
   ============================================ */
.content-area {
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Card
   ============================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
  backdrop-filter: blur(10px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.card:hover::before {
  opacity: 1;
}

.card:active {
  transform: translateY(0) scale(0.995);
}

.card.copied {
  border-color: var(--success);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.15);
}

.card.copied::before {
  background: var(--success);
  opacity: 1;
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 14px 16px 0;
  gap: 8px;
}

.card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  min-width: 24px;
  border-radius: 8px;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.card-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
  line-height: 1.5;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.card-btn {
  width: 30px;
  height: 30px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1rem;
}

.card-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.card-btn.expand-btn {
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.card-btn.expand-btn.expanded {
  transform: rotate(180deg);
}

.card-body {
  padding: 8px 16px 14px;
}

.card-content {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: hidden;
  transition: max-height var(--transition-smooth);
}

.card-content.clamped-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  max-height: 3.4em; /* 2 lines * 1.7 line-height */
}

.card-content.clamped-4 {
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  max-height: 6.8em; /* 4 lines * 1.7 line-height */
}

.card-content.expanded {
  -webkit-line-clamp: unset;
  max-height: 2000px;
}

.card-content a {
  color: var(--accent-3);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.card-content a:hover {
  color: var(--accent-2);
  text-decoration: underline;
}

/* Copy feedback */
.copy-feedback {
  position: absolute;
  bottom: 8px;
  right: 16px;
  background: var(--success);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  opacity: 0;
  transform: translateY(4px);
  transition: all 0.25s ease;
  pointer-events: none;
}

.copy-feedback.show {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Toast
   ============================================ */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: rgba(34, 197, 94, 0.95);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  backdrop-filter: blur(10px);
  pointer-events: none;
}

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

.toast.error {
  background: rgba(239, 68, 68, 0.95);
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 560px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: scale(0.92) translateY(20px);
  transition: transform var(--transition-smooth);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  width: 36px;
  height: 36px;
  border: none;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}

/* ============================================
   Settings List
   ============================================ */
.settings-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.settings-tab {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-tab.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: #fff;
}

.settings-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: all var(--transition-fast);
}

.settings-item:hover {
  border-color: var(--border-hover);
}

.settings-item-info {
  flex: 1;
  min-width: 0;
}

.settings-item-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.settings-item-preview {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.settings-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.settings-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.settings-btn:hover {
  border-color: var(--border-hover);
  color: var(--accent-1);
  background: rgba(108, 99, 255, 0.08);
}

.settings-btn.danger:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: rgba(239, 68, 68, 0.08);
}

.add-btn {
  width: 100%;
  padding: 14px;
  border: 2px dashed var(--border-color);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 4px;
}

.add-btn:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
  background: rgba(108, 99, 255, 0.05);
}

/* ============================================
   Edit Modal Form
   ============================================ */
.modal-edit {
  max-width: 520px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.12);
}

.form-textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.84rem;
  line-height: 1.7;
  resize: vertical;
  min-height: 160px;
  transition: all var(--transition-fast);
  outline: none;
}

.form-textarea:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.12);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.btn {
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  box-shadow: var(--accent-glow), var(--shadow-md);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.empty-state-text {
  font-size: 0.9rem;
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 480px) {
  .app-container {
    padding: 0 12px 30px;
  }

  .app-header {
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
  }

  .tab-container {
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
  }

  .logo h1 {
    font-size: 1.15rem;
  }

  .card-header {
    padding: 12px 14px 0;
  }

  .card-body {
    padding: 6px 14px 12px;
  }

  .modal {
    max-height: 90vh;
    border-radius: var(--radius-lg);
  }

  .modal-overlay {
    padding: 12px;
  }
}