:root {
  --bg-primary: #080a10;
  --bg-secondary: #0f1422;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 35, 56, 0.9);
  --border-color: rgba(99, 120, 160, 0.25);
  --border-focus: #38bdf8;
  
  --text-main: #f0f4fc;
  --text-muted: #8e9bb5;
  --text-highlight: #ffffff;
  
  --accent-cyan: #38bdf8;
  --accent-green: #34d399;
  --accent-gold: #fbbf24;
  --accent-purple: #c084fc;
  --accent-red: #f87171;
  
  --glow-cyan: 0 0 20px rgba(56, 189, 248, 0.35);
  --glow-gold: 0 0 20px rgba(251, 191, 36, 0.35);
  --glow-purple: 0 0 20px rgba(192, 132, 252, 0.35);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(168, 85, 247, 0.08) 0%, transparent 45%),
    linear-gradient(180deg, rgba(8, 10, 16, 0.95) 0%, rgba(12, 16, 26, 0.98) 100%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 10, 16, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284c7, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-cyan);
  font-size: 1.35rem;
  font-weight: bold;
  color: #fff;
  border: 1px solid rgba(56, 189, 248, 0.4);
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(90deg, #ffffff, #cbd5e1, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Server Mode Selector */
.server-mode-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  background: rgba(2, 132, 199, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.server-mode-select {
  background: transparent;
  border: none;
  color: inherit;
  font-size: inherit;
  font-weight: inherit;
  cursor: pointer;
  outline: none;
}

.server-mode-select option {
  background: var(--bg-secondary);
  color: var(--text-main);
}

.connection-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.connection-pill:hover {
  border-color: var(--text-muted);
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-red);
  box-shadow: 0 0 8px var(--accent-red);
  transition: var(--transition);
}

.status-dot.connected {
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  gap: 0.35rem;
  background: var(--bg-secondary);
  padding: 0.5rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: #fff;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

/* Main Container */
.main-container {
  flex: 1;
  padding: 1.5rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.tab-content {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

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

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

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.25rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 120, 160, 0.5);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  color: var(--text-highlight);
}

.card-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Stat Box */
.stat-box {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: #fff;
  border-color: rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
  box-shadow: var(--glow-cyan);
  filter: brightness(1.1);
}

.btn-success {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #fff;
  border-color: rgba(52, 211, 153, 0.4);
}

.btn-success:hover {
  box-shadow: 0 0 15px rgba(52, 211, 153, 0.4);
  filter: brightness(1.1);
}

.btn-gold {
  background: linear-gradient(135deg, #d97706, #f59e0b);
  color: #fff;
  border-color: rgba(251, 191, 36, 0.5);
}

.btn-gold:hover {
  box-shadow: var(--glow-gold);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--text-muted);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.775rem;
}

/* ==========================================================================
   Honkai: Star Rail Themed Avatar Cards & Portraits
   ========================================================================== */

.avatar-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
  position: relative;
  cursor: pointer;
  border-width: 1.5px;
}

/* 5-Star Card Theme */
.avatar-card.card-rarity-5 {
  border-color: rgba(251, 191, 36, 0.4);
  background: linear-gradient(145deg, rgba(251, 191, 36, 0.05) 0%, rgba(18, 24, 38, 0.8) 100%);
}

.avatar-card.card-rarity-5:hover {
  border-color: rgba(251, 191, 36, 0.8);
  box-shadow: var(--glow-gold);
}

/* 4-Star Card Theme */
.avatar-card.card-rarity-4 {
  border-color: rgba(192, 132, 252, 0.35);
  background: linear-gradient(145deg, rgba(192, 132, 252, 0.05) 0%, rgba(18, 24, 38, 0.8) 100%);
}

.avatar-card.card-rarity-4:hover {
  border-color: rgba(192, 132, 252, 0.8);
  box-shadow: var(--glow-purple);
}

.avatar-badge-rarity {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.rarity-5 {
  background: rgba(251, 191, 36, 0.2);
  border: 1px solid rgba(251, 191, 36, 0.6);
  color: var(--accent-gold);
}

.rarity-4 {
  background: rgba(192, 132, 252, 0.2);
  border: 1px solid rgba(192, 132, 252, 0.6);
  color: var(--accent-purple);
}

.avatar-header-info {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}

/* Circular / Rounded Avatar Portrait */
.avatar-image-container {
  position: relative;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.card-rarity-5 .avatar-image-container {
  border-color: var(--accent-gold);
}

.card-rarity-4 .avatar-image-container {
  border-color: var(--accent-purple);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.avatar-card:hover .avatar-img {
  transform: scale(1.12);
}

.avatar-icon-placeholder {
  width: 100%;
  height: 100%;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.25rem;
  color: var(--text-muted);
}

.avatar-name {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-highlight);
  line-height: 1.25;
}

.avatar-subinfo {
  font-size: 0.775rem;
  margin-top: 0.35rem;
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
}

/* Star Rail Element Badges */
.element-badge {
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.725rem;
  font-weight: 700;
}

.elem-fire { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.elem-ice { background: rgba(56, 189, 248, 0.2); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.4); }
.elem-lightning { background: rgba(168, 85, 247, 0.2); color: #c084fc; border: 1px solid rgba(168, 85, 247, 0.4); }
.elem-wind { background: rgba(16, 185, 129, 0.2); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.elem-physical { background: rgba(156, 163, 175, 0.2); color: #e5e7eb; border: 1px solid rgba(156, 163, 175, 0.4); }
.elem-quantum { background: rgba(99, 102, 241, 0.2); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.4); }
.elem-imaginary { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.4); }

.path-badge {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.725rem;
  font-weight: 600;
}

/* Eidolon Selector */
.eidolon-selector {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  background: rgba(0, 0, 0, 0.35);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.eidolon-buttons {
  display: flex;
  gap: 0.3rem;
}

.eidolon-pip {
  width: 25px;
  height: 25px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.eidolon-pip:hover {
  border-color: var(--accent-cyan);
  color: var(--text-main);
}

.eidolon-pip.active {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-color: #38bdf8;
  color: #0b0d14;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.6);
}

/* ==========================================================================
   Party / Lineup Builder
   ========================================================================== */
.lineup-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.lineup-slot-card {
  background: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 200px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.lineup-slot-card.filled {
  border-style: solid;
  border-color: rgba(56, 189, 248, 0.4);
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.08) 0%, rgba(18, 24, 38, 0.85) 100%);
}

.lineup-slot-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
}

.lineup-slot-img {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid var(--accent-cyan);
  object-fit: cover;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.lineup-slot-num {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: rgba(2, 132, 199, 0.2);
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* Ex Rank Toggle Switch */
.ex-switch-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  transition: var(--transition);
}

.ex-switch-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 120, 160, 0.45);
}

.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #374151;
  transition: .3s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input, .form-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: rgba(10, 13, 20, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
}

/* JSON Editor */
.json-editor-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.json-textarea {
  width: 100%;
  height: 480px;
  padding: 1rem;
  font-family: "Fira Code", Consolas, "Courier New", monospace;
  font-size: 0.85rem;
  background: #07090e;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: #38bdf8;
  resize: vertical;
  line-height: 1.4;
  outline: none;
}

.json-textarea:focus {
  border-color: var(--accent-cyan);
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 420px;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  background: rgba(18, 24, 38, 0.95);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  font-size: 0.875rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideInRight 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success { border-left: 4px solid var(--accent-green); }
.toast.error { border-left: 4px solid var(--accent-red); }
.toast.info { border-left: 4px solid var(--accent-cyan); }

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  padding: 1rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  animation: fadeIn 0.2s ease-out;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

/* Responsive */
@media (max-width: 900px) {
  .lineup-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .header-controls {
    width: 100%;
    justify-content: space-between;
  }
  .lineup-grid {
    grid-template-columns: 1fr;
  }
}