:root {
  --toolbar-bg: rgba(251, 251, 254, 0.82);
  --toolbar-border: rgba(0, 0, 0, 0.08);
  --toolbar-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --bar-bg: rgba(0, 0, 0, 0.04);
  --bar-bg-hover: rgba(0, 0, 0, 0.06);
  --bar-border: rgba(0, 0, 0, 0.08);
  --bar-focus-ring: rgba(59, 130, 246, 0.4);
  --bar-focus-bg: #fff;
  --text-primary: #1a1a1a;
  --text-secondary: rgba(0, 0, 0, 0.45);
  --text-tertiary: rgba(0, 0, 0, 0.3);
  --nav-hover: rgba(0, 0, 0, 0.06);
  --nav-active: rgba(0, 0, 0, 0.1);
  --stage-bg: #f5f5f7;
  --status-bg: rgba(255, 255, 255, 0.88);
  --status-border: rgba(0, 0, 0, 0.06);
  --accent: #007aff;
  --accent-text: #0066d6;
  --loading-bar: #007aff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --toolbar-bg: rgba(40, 40, 44, 0.82);
    --toolbar-border: rgba(255, 255, 255, 0.08);
    --toolbar-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 8px 24px rgba(0, 0, 0, 0.15);
    --bar-bg: rgba(255, 255, 255, 0.07);
    --bar-bg-hover: rgba(255, 255, 255, 0.1);
    --bar-border: rgba(255, 255, 255, 0.1);
    --bar-focus-ring: rgba(100, 160, 255, 0.4);
    --bar-focus-bg: rgba(30, 30, 34, 0.95);
    --text-primary: #f0f0f0;
    --text-secondary: rgba(255, 255, 255, 0.5);
    --text-tertiary: rgba(255, 255, 255, 0.25);
    --nav-hover: rgba(255, 255, 255, 0.08);
    --nav-active: rgba(255, 255, 255, 0.14);
    --stage-bg: #1c1c1e;
    --status-bg: rgba(44, 44, 48, 0.9);
    --status-border: rgba(255, 255, 255, 0.08);
    --accent: #4da3ff;
    --accent-text: #6bb3ff;
    --loading-bar: #4da3ff;
  }
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  font-size: 13px;
  line-height: 1;
  color: var(--text-primary);
  background: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input { font: inherit; }
button { cursor: pointer; border: 0; background: none; }

/* ── Shell ── */
.browser-shell {
  position: relative;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Toolbar ── */
.toolbar {
  position: relative;
  z-index: 10;
  flex-shrink: 0;
  background: var(--toolbar-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--toolbar-border);
  box-shadow: var(--toolbar-shadow);
  padding: 0 14px;
}

.toolbar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 48px;
}

/* ── Navigation ── */
.nav-group {
  display: flex;
  align-items: center;
  gap: 2px;
  -webkit-app-region: no-drag;
}

.nav-btn {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: background 0.12s ease, opacity 0.12s ease;
}

.nav-btn:not(:disabled):hover { background: var(--nav-hover); }
.nav-btn:not(:disabled):active { background: var(--nav-active); }

.nav-btn:disabled {
  opacity: 0.28;
  cursor: default;
}

/* ── Address Bar ── */
.address-bar-wrapper {
  flex: 1;
  min-width: 0;
  -webkit-app-region: no-drag;
}

.address-bar {
  position: relative;
  display: flex;
  align-items: center;
  height: 34px;
  border-radius: 8px;
  background: var(--bar-bg);
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.address-bar:hover {
  background: var(--bar-bg-hover);
}

.address-bar.focused {
  background: var(--bar-focus-bg);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--bar-focus-ring);
}

.address-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  flex-shrink: 0;
  color: var(--text-tertiary);
  transition: color 0.2s ease;
}

.address-bar.secure .address-icon { color: var(--accent-text); }

.address-icon .icon-globe { display: block; }
.address-icon .icon-lock { display: none; }
.address-bar.secure .address-icon .icon-globe { display: none; }
.address-bar.secure .address-icon .icon-lock { display: block; }

#url-input {
  flex: 1;
  min-width: 0;
  height: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.01em;
  padding: 0 2px;
  text-overflow: ellipsis;
}

#url-input::placeholder {
  color: var(--text-tertiary);
}

#url-input::selection {
  background: rgba(59, 130, 246, 0.25);
}

.reload-btn {
  width: 34px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-secondary);
  border-radius: 0 7px 7px 0;
  transition: color 0.12s ease, background 0.12s ease;
}

.reload-btn svg {
  flex-shrink: 0;
}

.reload-btn:hover {
  color: var(--text-primary);
  background: var(--nav-hover);
}

.reload-btn:active {
  background: var(--nav-active);
}

.reload-btn .icon-stop { display: none; }
.address-bar.loading .reload-btn .icon-reload { display: none; }
.address-bar.loading .reload-btn .icon-stop { display: block; }

/* ── Suggestions ── */
.address-bar-wrapper {
  position: relative;
}

.suggestions {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 100;
  max-height: 280px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-radius: 10px;
  background: var(--status-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 0.5px solid var(--toolbar-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.14), 0 1px 3px rgba(0, 0, 0, 0.06);
  padding: 4px;
  animation: suggestions-in 0.15s ease;
}

.suggestions[hidden] { display: none; }

@keyframes suggestions-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.suggestion {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.08s ease;
}

.suggestion:hover,
.suggestion.active {
  background: var(--nav-hover);
}

.suggestion-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
}

.suggestion-url {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.suggestion-url mark {
  background: none;
  color: var(--accent);
  font-weight: 600;
}

.suggestion-host {
  flex-shrink: 0;
  font-size: 11px;
  color: var(--text-tertiary);
}

/* ── Loading Bar ── */
.loading-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--loading-bar);
  border-radius: 0 1px 1px 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.address-bar.loading .loading-bar {
  opacity: 1;
  animation: loading-progress 2.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes loading-progress {
  0%   { width: 0; }
  10%  { width: 25%; }
  30%  { width: 50%; }
  50%  { width: 70%; }
  70%  { width: 82%; }
  90%  { width: 90%; }
  100% { width: 94%; }
}

.address-bar.load-complete .loading-bar {
  width: 100% !important;
  opacity: 0;
  transition: width 0.2s ease, opacity 0.4s ease 0.2s;
  animation: none;
}

/* ── Page Stage ── */
.page-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-tertiary);
  user-select: none;
}

.empty-state[hidden] { display: none; }

.empty-icon {
  margin-bottom: 4px;
  animation: pulse-ring 3s ease-in-out infinite;
}

@keyframes pulse-ring {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.04); }
}

.empty-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

.empty-sub {
  font-size: 12px;
  line-height: 1.4;
}

/* ── Error State ── */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  user-select: none;
  animation: error-in 0.3s ease;
}

.error-state[hidden] { display: none; }

@keyframes error-in {
  from { opacity: 0; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1); }
}

.error-icon {
  margin-bottom: 6px;
  color: var(--text-tertiary);
}

.error-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.error-detail {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
  text-align: center;
  max-width: 320px;
}

.error-retry {
  margin-top: 8px;
  padding: 7px 20px;
  border-radius: 7px;
  border: 0;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  transition: filter 0.12s ease;
}

.error-retry:hover { filter: brightness(1.1); }
.error-retry:active { filter: brightness(0.9); }

/* ── Status Bar ── */
.status-bar {
  position: fixed;
  left: 8px;
  bottom: 8px;
  z-index: 20;
  max-width: min(480px, calc(100vw - 16px));
  padding: 5px 10px;
  border-radius: 6px;
  background: var(--status-bg);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border: 0.5px solid var(--status-border);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  font-size: 11px;
  color: var(--text-secondary);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-bar.hidden {
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
}