:root {
  --bg: #121418;
  --dark-blue: #0B1C2B;
  --dark-purple: #1B1035;
  --primary: #7B2EFF;
  --accent: #00C6FF;
  --text: #E0E0E0;
  --surface-1: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.10);
  --ring: 0 0 0 3px rgba(123, 46, 255, 0.35);
  --glow: 0 8px 30px rgba(123, 46, 255, 0.25), 0 2px 10px rgba(0, 198, 255, 0.15);
}

/* Load InterVariable */
@font-face {
  font-family: 'InterVariable';
  src: url('../assets/images/fonts/InterVariable.ttf') format('truetype');
  font-weight: 100 900;
  font-display: swap;
}

body {
  /* Nebula gradient background with subtle radial glow */
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(0, 198, 255, 0.15), transparent 60%),
    radial-gradient(1000px 500px at 110% 10%, rgba(123, 46, 255, 0.2), transparent 60%),
    linear-gradient(145deg, var(--bg) 0%, var(--dark-purple) 100%);
  color: var(--text);
  font-family: 'InterVariable', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  margin: 0;
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  overflow: auto;
}

.container {
  position: relative;
  background: linear-gradient(180deg, rgba(20, 14, 40, 0.6), rgba(16, 10, 28, 0.6));
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  padding: 0;
  border-radius: 18px;
  border: 1px solid var(--card-border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  max-width: 1200px;
  width: 100%;
  display: flex;
  overflow: hidden;
  max-height: calc(100vh - 4rem);
}

/* Subtle animated sheen around the container */
.container::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(123,46,255,0.25), rgba(0,198,255,0.15) 40%, transparent 60%);
  filter: blur(20px);
  z-index: 0;
  pointer-events: none;
}

/* Sidebar + content layout */
.sidebar {
  width: 280px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border-right: 1px solid rgba(255,255,255,0.08);
  padding: 1.25rem 1rem;
  position: relative;
  z-index: 1;
}

.sidebar h1 {
  font-size: 1.1rem;
  margin: 0 0 1rem 0;
  color: var(--primary);
  letter-spacing: 0.4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tabs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tab-link {
  text-align: left;
  background: linear-gradient(180deg, transparent, transparent);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 12px 10px 14px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
  font-size: 14px;
  font-family: inherit;
  width: 100%;
  position: relative;
  z-index: 1;
}

.tab-link:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.08);
}

.tab-link.active {
  background: linear-gradient(180deg, rgba(123, 46, 255, 0.18), rgba(0, 198, 255, 0.10));
  color: #fff;
  border: 1px solid rgba(123,46,255,0.35);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06);
}

/* Left accent bar */
.tab-link.active::before {
  content: '';
  position: absolute;
  left: -1px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--primary));
}

.content {
  flex: 1;
  padding: 1.25rem 1.5rem 2rem 1.5rem;
  overflow: auto;
  position: relative;
  z-index: 1;
  background:
    radial-gradient(800px 300px at 60% -10%, rgba(0, 198, 255, 0.10), transparent 50%),
    radial-gradient(700px 260px at 20% -20%, rgba(123, 46, 255, 0.18), transparent 50%);
}

.tab-panel {
  display: none;
}

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

h1 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

label {
  font-weight: bold;
  margin-bottom: 0.5rem;
}

input {
  padding: 0.6rem;
  font-size: 1rem;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  margin-bottom: 0.75rem;
  background-color: rgba(11, 28, 43, 0.6);
  color: var(--text);
  outline: none;
}
input:focus {
  box-shadow: var(--ring);
  border-color: rgba(123,46,255,0.5);
}

button {
  padding: 0.65rem 0.9rem;
  font-size: 0.95rem;
  background: linear-gradient(180deg, rgba(123,46,255,0.95), rgba(90, 20, 220, 0.95));
  color: #fff;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, background 0.2s ease, filter 0.2s ease;
}

button:hover {
  filter: brightness(1.03) saturate(1.05);
  box-shadow: var(--glow);
}

button:active {
  transform: translateY(1px);
}

.note {
  font-size: 0.8rem;
  color: #aaa;
  margin-top: 1rem;
}

.status {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(18,20,24,0.8);
  color: white;
  padding: 0.8rem 1.2rem;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
  font-size: 1rem;
  z-index: 1000;
}

.status.hidden {
  display: none;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.setting-group input,
.setting-group button {
  width: 100%;
  box-sizing: border-box;
}

/* Cards (customization groups) */
.customization-group {
  background: linear-gradient(180deg, var(--surface-1), var(--surface-2));
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px 16px 16px 16px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
  margin-bottom: 20px;
}

.customization-group > h3 {
  margin: 0 0 10px 0;
  position: relative;
  padding-left: 10px;
}

.customization-group > h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--primary));
}

/* Section titles */
h2 {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  margin: 0 0 12px 0;
}

h2::after {
  content: '';
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, rgba(255,255,255,0.15), transparent);
}

/* Theming: theme selector buttons override */
.theme-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  padding: 10px 0;
}
.theme-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 8px;
  border: 1px solid rgba(255,255,255,0.10) !important;
  border-radius: 12px !important;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02)) !important;
  color: var(--text);
  text-align: center;
  font-size: 0.85rem;
  min-height: 90px;
}
.theme-btn:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.25); }
.theme-btn.active {
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06), var(--glow);
}
.theme-preview {
  width: 60px;
  height: 40px;
  border-radius: 6px !important;
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}
.theme-preview::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  pointer-events: none;
}
.custom-theme-btn { border-style: dashed !important; opacity: 0.95; }
.custom-theme-btn:hover { opacity: 1; }

/* Range sliders */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: linear-gradient(90deg, rgba(123,46,255,0.6), rgba(0,198,255,0.6));
  border-radius: 999px;
  outline: none;
  border: 1px solid rgba(255,255,255,0.15);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid rgba(123,46,255,0.9);
  box-shadow: 0 2px 10px rgba(123,46,255,0.35);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid rgba(123,46,255,0.9);
  box-shadow: 0 2px 10px rgba(123,46,255,0.35);
}

/* Checkboxes/radios */
input[type="checkbox"], input[type="radio"] {
  accent-color: #8a4dff;
}

/* Layout & logo options */
.layout-options { display: flex; flex-direction: column; gap: 10px; }
.layout-options label { display: flex; align-items: center; gap: 8px; cursor: pointer; padding: 8px; border-radius: 6px; transition: background 0.2s ease; }
.layout-options label:hover { background: rgba(255,255,255,0.05); }
.logo-options { display: flex; flex-direction: column; gap: 12px; }
.logo-options label { display: flex; align-items: center; gap: 8px; }
.logo-options input[type="text"] { flex: 1; }

/* Color customization controls */
.color-controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; }
.color-group { display: flex; flex-direction: column; gap: 5px; }
.color-group label { font-size: 0.9rem; color: var(--text); opacity: 0.9; }
input[type="color"] {
  width: 100%;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

/* Preview area */
.preview-container {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.03)) !important;
  border-radius: 14px !important;
  border: 1px solid var(--card-border) !important;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.preview-home {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  padding: 20px;
  background: var(--bg);
  border-radius: 8px;
  min-height: 200px;
  border: 1px dashed rgba(255,255,255,0.12);
}
.preview-text { letter-spacing: 0.3px; }
.preview-logo { font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.preview-search { width: 60%; height: 40px; background: rgba(255,255,255,0.1); border-radius: 20px; border: 1px solid rgba(255,255,255,0.2); }
.preview-bookmarks { display: flex; gap: 10px; }
.preview-bookmark { width: 50px; height: 50px; background: var(--accent); border-radius: 8px; }

/* History lists */
#search-history-list, #site-history-list {
  padding: 0;
  margin: 6px 0 0 0;
  display: grid;
  gap: 6px;
}
#search-history-list li, #site-history-list li {
  list-style: none;
  padding: 8px 10px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
}
#site-history-list a {
  color: var(--accent);
  text-decoration: none;
}
#site-history-list a:hover { text-decoration: underline; }

/* About buttons */
.github-btn, .help-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: linear-gradient(180deg, rgba(123,46,255,0.95), rgba(90, 20, 220, 0.95));
  color: #fff;
  border: 1px solid rgba(255,255,255,0.08) !important;
  border-radius: 10px !important;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, filter 0.2s ease;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
}
.github-btn:hover, .help-btn:hover { filter: brightness(1.03) saturate(1.05); box-shadow: var(--glow); }
.github-btn:active, .help-btn:active { transform: translateY(1px); }
.about-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* Debug info */
.debug-info {
  background: rgba(0,0,0,0.35) !important;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
}

/* General lists inside cards */
.customization-group ul { list-style: none; padding: 0; margin: 0; }
.customization-group ul li { padding: 6px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
.customization-group ul li:last-child { border-bottom: none; }

/* Theme management buttons */
.theme-management { display: flex; flex-wrap: wrap; gap: 10px; }
#reset-to-default { background: linear-gradient(180deg, #e53e3e, #c53030); }

/* Scrollbar styling (Chromium) */
*::-webkit-scrollbar { height: 10px; width: 10px; }
*::-webkit-scrollbar-track { background: rgba(255,255,255,0.04); border-radius: 999px; }
*::-webkit-scrollbar-thumb { background: linear-gradient(180deg, rgba(123,46,255,0.7), rgba(0,198,255,0.7)); border-radius: 999px; }
*::-webkit-scrollbar-thumb:hover { background: linear-gradient(180deg, rgba(123,46,255,0.9), rgba(0,198,255,0.9)); }

/* small-screen adjustments */
@media (max-width: 480px) {
  .container {
    padding: 0;
    border-radius: 12px;
    box-shadow: 0 0 8px rgba(0,0,0,0.35);
    flex-direction: column;
    max-width: 100%;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 0.5rem;
  }
  .tabs { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .tab-link { flex: 1 1 auto; }
  h1 {
    font-size: 1.25rem;
  }
}