/* ── Variables ───────────────────────────────────────────────────────────── */
:root {
  --bg-primary:    #050505;
  --bg-secondary:  #0a0a0a;
  --bg-tertiary:   #111111;
  --bg-quaternary: #181818;
  --text-primary:  #ffffff;
  --text-secondary:#a0a0a0;
  --text-tertiary: #555555;
  --accent:        #3b82f6;
  --accent-hover:  #60a5fa;
  --border:        #1e1e1e;
  --border-hover:  #2e2e2e;
  --border-focus:  #444444;
  --font:          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --r-sm:  4px;
  --r-md:  8px;
  --r-lg:  12px;
  --r-xl:  16px;
  --r-full:9999px;
  --sh-sm: 0 1px 3px rgba(0,0,0,.6);
  --sh-md: 0 4px 8px  rgba(0,0,0,.6);
  --sh-lg: 0 12px 24px rgba(0,0,0,.7);
  --t-fast:   140ms ease;
  --t-normal: 220ms ease;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.browser-body {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.browser-ui {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.browser-content {
  flex: 1;
  position: relative;   /* ← loading overlay is scoped here */
  overflow: hidden;
  background: var(--bg-primary);
}

/* ── Tabs Bar ────────────────────────────────────────────────────────────── */
.tabs-bar {
  display: flex;
  align-items: flex-end;
  height: 38px;
  background: var(--bg-primary);
  padding: 0 6px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  gap: 2px;
}
.tabs-bar::-webkit-scrollbar { display: none; }

.tab {
  display: flex;
  align-items: center;
  min-width: 130px;
  max-width: 210px;
  height: 32px;
  padding: 0 10px;
  border-radius: 7px 7px 0 0;
  color: var(--text-secondary);
  background: transparent;
  border-top: 2px solid transparent;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  cursor: default;
  user-select: none;
  transition: background var(--t-fast), color var(--t-fast);
}
.tab:hover { background: rgba(255,255,255,.04); }
.tab.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-top-color: var(--accent);
  border-left-color: var(--border);
  border-right-color: var(--border);
}

.tab-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-right: 7px;
  width: 14px;
  height: 14px;
}
.tab-icon img { width: 14px; height: 14px; border-radius: 2px; }
.tab-icon svg { width: 13px; height: 13px; }

.tab-title {
  flex: 1;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  margin-left: 6px;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
}
.tab-close:hover { background: rgba(255,255,255,.12); color: var(--text-primary); }
.tab-close svg   { width: 10px; height: 10px; }

.add-tab-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  flex-shrink: 0;
  margin-bottom: 2px;
  transition: background var(--t-fast), color var(--t-fast);
}
.add-tab-btn:hover { background: rgba(255,255,255,.1); color: var(--text-primary); }
.add-tab-btn svg   { width: 14px; height: 14px; }

/* ── Nav Bar ─────────────────────────────────────────────────────────────── */
.nav-bar {
  display: flex;
  align-items: center;
  height: 42px;
  padding: 0 10px;
  gap: 6px;
  background: var(--bg-secondary);
}

.nav-actions, .ext-actions {
  display: flex;
  align-items: center;
  gap: 1px;
  flex-shrink: 0;
}

.nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--r-md);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
}
.nav-btn svg { width: 15px; height: 15px; }
.nav-btn:hover:not(:disabled) { background: var(--bg-tertiary); color: var(--text-primary); }
.nav-btn:disabled { opacity: .3; cursor: not-allowed; }

/* ── URL Bar ─────────────────────────────────────────────────────────────── */
.url-bar-container {
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 0;
  height: 30px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  padding: 0 10px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.url-bar-container:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59,130,246,.1);
}

.url-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-tertiary);
  margin-right: 7px;
}
.url-icon svg { width: 13px; height: 13px; }

.url-input {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 12.5px;
  font-family: var(--font);
}
.url-input::placeholder { color: var(--text-tertiary); }

.bookmark-star-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: color var(--t-fast), background var(--t-fast);
}
.bookmark-star-btn:hover { background: var(--bg-quaternary); color: var(--text-primary); }
.bookmark-star-btn.lit   { color: #f59e0b; }
.bookmark-star-btn svg   { width: 13px; height: 13px; }

/* ── Bookmarks Bar ───────────────────────────────────────────────────────── */
.bookmarks-bar {
  display: flex;
  align-items: center;
  height: 26px;
  padding: 0 10px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  overflow-x: auto;
  scrollbar-width: none;
  gap: 2px;
}
.bookmarks-bar::-webkit-scrollbar { display: none; }

.bookmarks-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--text-tertiary);
  margin-right: 10px;
  flex-shrink: 0;
  user-select: none;
}

.bookmarks-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.bookmark-node {
  display: flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: var(--r-sm);
  color: var(--text-secondary);
  font-size: 11.5px;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: background var(--t-fast), color var(--t-fast);
}
.bookmark-node:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.bookmark-icon {
  width: 13px;
  height: 13px;
  border-radius: 2px;
  margin-right: 5px;
  flex-shrink: 0;
}

/* ── Iframes ─────────────────────────────────────────────────────────────── */
#iframe-container {
  position: absolute;
  inset: 0;
}

.tab-frame {
  display: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  background: #fff;
}
.tab-frame.active { display: block; }

/* ── Loading Overlay (scoped to .browser-content) ────────────────────────── */
.loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(5,5,5,.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.loading-overlay.hidden { display: none !important; }

/* Dual-ring spinner */
.loader-ring {
  position: relative;
  width: 40px;
  height: 40px;
}
.loader-track,
.loader-fill {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2.5px solid transparent;
}
.loader-track {
  border-color: rgba(255,255,255,.07);
}
.loader-fill {
  border-top-color: var(--accent);
  border-right-color: rgba(59,130,246,.25);
  animation: spin .72s cubic-bezier(.4,0,.2,1) infinite;
}
/* inner counter-ring */
.loader-ring::after {
  content: '';
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  border: 1.5px solid transparent;
  border-bottom-color: rgba(255,255,255,.18);
  animation: spin 1.1s cubic-bezier(.4,0,.2,1) infinite reverse;
}

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

.loading-text {
  font-size: 11.5px;
  color: var(--text-tertiary);
  letter-spacing: .5px;
  font-weight: 500;
}

/* ── Settings Modal ──────────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.modal-backdrop.hidden { display: none !important; }

.modal-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hover);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  overflow: hidden;
  animation: modal-in .15s ease-out both;
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(8px) scale(.98); }
  to   { opacity: 1; transform: translateY(0)  scale(1);    }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 14px; font-weight: 600; letter-spacing: -.2px; }

.modal-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.settings-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.settings-section-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--text-secondary);
}
.label-badge {
  font-size: 9px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  background: rgba(59,130,246,.15);
  color: var(--accent-hover);
  letter-spacing: .4px;
  text-transform: uppercase;
}

/* Engine buttons */
.search-engine-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}
.engine-btn {
  padding: 7px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
  text-align: center;
}
.engine-btn:hover { border-color: var(--border-hover); color: var(--text-primary); }
.engine-btn.active {
  background: rgba(59,130,246,.1);
  border-color: rgba(59,130,246,.45);
  color: var(--accent-hover);
  font-weight: 600;
}

.text-input {
  width: 100%;
  height: 36px;
  padding: 0 11px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text-primary);
  font-size: 12.5px;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.text-input:focus {
  border-color: rgba(59,130,246,.5);
  box-shadow: 0 0 0 2px rgba(59,130,246,.1);
}
.text-input::placeholder { color: var(--text-tertiary); }

.helper-text {
  font-size: 11px;
  color: var(--text-tertiary);
  line-height: 1.55;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 7px;
  padding: 11px 18px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
}

.btn-primary, .btn-secondary {
  height: 32px;
  padding: 0 16px;
  border-radius: var(--r-md);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
}
.btn-primary           { background: var(--accent);      color: #fff; }
.btn-primary:hover     { background: var(--accent-hover);            }
.btn-secondary         { background: var(--bg-quaternary); border: 1px solid var(--border); color: var(--text-secondary); }
.btn-secondary:hover   { border-color: var(--border-hover); color: var(--text-primary); }

.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 26px; height: 26px;
  background: none; border: none; border-radius: var(--r-sm);
  color: var(--text-secondary); cursor: pointer;
  transition: color var(--t-fast), background var(--t-fast);
}
.icon-btn:hover  { color: var(--text-primary); background: var(--bg-quaternary); }
.icon-btn svg    { width: 14px; height: 14px; }

/* ── New Tab Page ────────────────────────────────────────────────────────── */
.newtab-body {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

#particle-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.newtab-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 680px;
  padding: 0 24px;
  z-index: 1;
}

.brand-title {
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -2px;
  color: var(--text-primary);
  margin-bottom: 32px;
  user-select: none;
  text-shadow: 0 0 40px rgba(255,255,255,.06);
}

.search-container {
  width: 100%;
  max-width: 560px;
  margin-bottom: 44px;
}

.search-box {
  display: flex;
  align-items: center;
  height: 48px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-hover);
  border-radius: var(--r-full);
  padding: 0 16px;
  transition: border-color var(--t-normal), box-shadow var(--t-normal);
}
.search-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59,130,246,.1), var(--sh-md);
}

.search-btn {
  display: flex; align-items: center; justify-content: center;
  background: none; border: none;
  color: var(--text-tertiary); cursor: pointer; margin-right: 11px;
  transition: color var(--t-fast);
}
.search-btn:hover { color: var(--text-secondary); }
.search-btn svg   { width: 15px; height: 15px; }

.search-input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text-primary); font-size: 14.5px; font-family: var(--font);
}
.search-input::placeholder { color: var(--text-tertiary); }

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 440px;
}
.shortcut-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 14px 10px;
  gap: 9px;
  text-decoration: none;
  transition: background var(--t-normal), border-color var(--t-normal),
              color var(--t-normal), transform var(--t-normal), box-shadow var(--t-normal);
}
.shortcut-box:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: var(--sh-md);
}
.shortcut-icon-wrapper {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  transition: transform var(--t-normal);
}
.shortcut-box:hover .shortcut-icon-wrapper { transform: scale(1.08); }
.shortcut-text { font-size: 11.5px; font-weight: 500; user-select: none; text-align: center; }

/* ── Utility ─────────────────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 560px) {
  .shortcuts-grid    { grid-template-columns: repeat(2, 1fr); max-width: 240px; }
  .brand-title       { font-size: 2.4rem; }
  .search-engine-grid{ grid-template-columns: 1fr 1fr; }
}