/* ===== Design Tokens ===== */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fb;
  --color-bg-card: #ffffff;
  --color-surface: #f1f3f5;
  --color-border: #e2e5e9;
  --color-text: #1a1d23;
  --color-text-secondary: #5f6672;
  --color-text-muted: #8b919d;
  --color-accent: #3b5bdb;
  --color-accent-light: #edf2ff;
  --color-accent-hover: #364fc7;
  --color-success: #2b8a3e;
  --color-warn: #e67700;
  --color-error: #e03131;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --nav-height: 64px;
}

[data-theme="dark"] {
  --color-bg: #0f1117;
  --color-bg-alt: #161822;
  --color-bg-card: #1a1d2b;
  --color-surface: #22253a;
  --color-border: #2d3148;
  --color-text: #e8eaf0;
  --color-text-secondary: #9ba1b0;
  --color-text-muted: #6b7185;
  --color-accent: #5c7cfa;
  --color-accent-light: #1c2340;
  --color-accent-hover: #748ffc;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.4);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.5);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color .15s;
}
a:hover { color: var(--color-accent-hover); }

code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--color-surface);
  padding: 2px 7px;
  border-radius: 4px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: all .15s;
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}
.btn-sm {
  padding: 8px 18px;
  font-size: .85rem;
}
.btn-icon {
  width: 18px;
  height: 18px;
}

/* ===== Navigation ===== */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: background .2s;
}
[data-theme="dark"] #nav {
  background: rgba(15,17,23,.85);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}
.nav-brand:hover { color: var(--color-text); }
.nav-logo {
  width: 32px;
  height: 32px;
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  color: var(--color-text-secondary);
  font-size: .9rem;
  font-weight: 500;
  transition: color .15s;
}
.nav-links a:hover {
  color: var(--color-text);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all .15s;
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-border);
}
.theme-toggle svg { width: 18px; height: 18px; }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all .2s;
}
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 20px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu a {
  color: var(--color-text-secondary);
  font-size: .95rem;
  font-weight: 500;
  padding: 10px 0;
}
.mobile-menu.open { display: flex; }

/* ===== Hero ===== */
.hero {
  padding: calc(var(--nav-height) + 80px) 0 100px;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: .82rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 24px;
  letter-spacing: .02em;
}
.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-bottom: 20px;
}
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent), #7048e8, #ae3ec9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.hero-browsers {
  display: flex;
  align-items: center;
  gap: 20px;
}
.hero-browsers-label {
  font-size: .85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}
.browser-icons {
  display: flex;
  gap: 16px;
}
.browser-icon {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-secondary);
  font-size: .85rem;
  font-weight: 500;
}
.browser-icon svg {
  width: 22px;
  height: 22px;
}

/* Popup Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
}
.popup-mockup {
  width: 380px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}
.popup-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.popup-dots {
  display: flex;
  gap: 6px;
}
.popup-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.popup-dots span:nth-child(1) { background: #e03131; }
.popup-dots span:nth-child(2) { background: #e67700; }
.popup-dots span:nth-child(3) { background: #2b8a3e; }
.popup-title {
  font-weight: 600;
  font-size: .85rem;
  color: var(--color-text-secondary);
}
.popup-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
}
.popup-tab {
  flex: 1;
  text-align: center;
  padding: 10px 0;
  font-size: .82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: default;
  position: relative;
}
.popup-tab.active {
  color: var(--color-accent);
}
.popup-tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px 2px 0 0;
}
.tab-badge {
  display: inline-block;
  background: var(--color-error);
  color: #fff;
  font-size: .65rem;
  padding: 1px 6px;
  border-radius: 100px;
  margin-left: 4px;
  vertical-align: middle;
}
.popup-body {
  display: flex;
  min-height: 260px;
}
.popup-config-ribbon {
  width: 72px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 10px 6px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.config-item {
  padding: 8px 4px;
  text-align: center;
  font-size: .7rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: default;
}
.config-item.active {
  background: var(--color-accent);
  color: #fff;
}
.config-item.add {
  border: 1.5px dashed var(--color-border);
  color: var(--color-text-muted);
  font-size: 1rem;
}
.popup-editor {
  flex: 1;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.directive-row {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.directive-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.directive-toggle {
  width: 28px;
  height: 14px;
  border-radius: 100px;
  position: relative;
}
.directive-toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  transition: left .2s;
}
.directive-toggle.on {
  background: var(--color-accent);
}
.directive-toggle.on::after {
  left: 16px;
}
.directive-toggle.off {
  background: var(--color-border);
}
.directive-toggle.off::after {
  left: 2px;
}
.directive-header code {
  font-size: .78rem;
  font-weight: 600;
  background: transparent;
  padding: 0;
}
.directive-actions {
  margin-left: auto;
  display: flex;
  gap: 6px;
}
.action-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-text-muted);
}
.action-dot.red {
  background: var(--color-error);
}
.directive-value {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--color-text-secondary);
  padding-left: 36px;
}
.directive-value.dim {
  opacity: .45;
}
.popup-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
  justify-content: flex-end;
}
.popup-btn {
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: .78rem;
  font-weight: 600;
  cursor: default;
}
.popup-btn.primary {
  background: var(--color-accent);
  color: #fff;
}
.popup-btn.outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text-secondary);
}

/* ===== Section Headers ===== */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}
.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 16px;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Features ===== */
.features {
  padding: 100px 0;
  background: var(--color-bg-alt);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all .2s;
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}
.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: .92rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ===== How It Works ===== */
.how-it-works {
  padding: 100px 0;
}
.modes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 72px;
}
.mode-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
}
.mode-number {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: .95rem;
  border-radius: 50%;
  margin-bottom: 20px;
}
.mode-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.mode-desc {
  color: var(--color-text-secondary);
  font-size: .95rem;
  line-height: 1.65;
  margin-bottom: 20px;
}
.mode-details {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mode-details li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
  color: var(--color-text-secondary);
}
.mode-details li svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.mode-tag {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: .75rem;
  font-weight: 600;
  border-radius: 100px;
}
.mode-tag.advanced {
  background: #fff3bf;
  color: #e67700;
}
[data-theme="dark"] .mode-tag.advanced {
  background: #3d3010;
  color: #fcc419;
}

/* Workflow Steps */
.workflow-title {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 40px;
}
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
}
.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 180px;
}
.step-num {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50%;
  margin-bottom: 14px;
}
.step-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.step-content p {
  font-size: .85rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}
.step-arrow {
  padding-top: 10px;
  color: var(--color-text-muted);
}
.step-arrow svg {
  width: 20px;
  height: 20px;
}

/* ===== Documentation ===== */
.docs {
  padding: 100px 0;
  background: var(--color-bg-alt);
}
.docs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.doc-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.doc-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}
.doc-content h4 {
  font-size: .95rem;
  font-weight: 700;
  margin: 18px 0 8px;
}
.doc-content h4:first-child {
  margin-top: 0;
}
.doc-content p {
  font-size: .9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 10px;
}
.doc-content ul, .doc-content ol {
  padding-left: 20px;
  margin-bottom: 12px;
}
.doc-content li {
  font-size: .9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 4px;
}
.code-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 12px 0;
}
.code-block code {
  background: none;
  padding: 0;
  font-size: .82rem;
  line-height: 1.8;
}
.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}
.ref-table th,
.ref-table td {
  text-align: left;
  padding: 10px 12px;
  font-size: .85rem;
  border-bottom: 1px solid var(--color-border);
}
.ref-table th {
  font-weight: 600;
  color: var(--color-text);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.ref-table td {
  color: var(--color-text-secondary);
}

/* ===== Install ===== */
.install {
  padding: 100px 0;
}
.install-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 640px;
  margin: 0 auto;
}
.install-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 48px 36px;
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all .2s;
  color: var(--color-text);
}
.install-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  color: var(--color-text);
  transform: translateY(-3px);
}
.install-browser-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 20px;
}
.install-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.install-card p {
  font-size: .85rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}
.install-btn {
  padding: 10px 28px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: .9rem;
  border-radius: var(--radius-sm);
  transition: background .15s;
}
.install-card:hover .install-btn {
  background: var(--color-accent-hover);
}

/* ===== FAQ ===== */
.faq {
  padding: 100px 0;
  background: var(--color-bg-alt);
}
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item summary {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color .15s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: transform .2s;
  flex-shrink: 0;
  margin-left: 16px;
}
.faq-item[open] summary::after {
  content: '\2212';
}
.faq-item summary:hover {
  color: var(--color-accent);
}
.faq-item p {
  padding: 0 24px 20px;
  font-size: .92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}
.footer-logo {
  width: 28px;
  height: 28px;
}
.footer-links {
  display: flex;
  gap: 28px;
}
.footer-links a {
  color: var(--color-text-secondary);
  font-size: .88rem;
  font-weight: 500;
}
.footer-links a:hover {
  color: var(--color-text);
}
.footer-copy {
  font-size: .82rem;
  color: var(--color-text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-content { text-align: center; }
  .hero-subtitle { margin: 0 auto 32px; }
  .hero-actions { justify-content: center; }
  .hero-browsers { justify-content: center; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .docs-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions .btn { display: none; }
  .mobile-menu-btn { display: flex; }

  .hero { padding: calc(var(--nav-height) + 48px) 0 64px; }
  .hero h1 { font-size: 2rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .modes-grid { grid-template-columns: 1fr; }
  .steps { flex-direction: column; align-items: center; }
  .step-arrow { transform: rotate(90deg); padding: 0; }
  .install-grid { grid-template-columns: 1fr; max-width: 340px; }
  .popup-mockup { width: 100%; max-width: 360px; }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  .footer-links { justify-content: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.7rem; }
  .section-header h2 { font-size: 1.6rem; }
  .mode-card { padding: 28px 24px; }
  .doc-card { padding: 28px 24px; }
}