/* ============================================
   ForceforDev — Material Design You 3 Theme
   Shared Stylesheet
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=DM+Sans:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/icon?family=Material+Symbols+Rounded');

/* --- Material 3 Design Tokens --- */
:root {
  /* Primary */
  --md-primary: #1a56db;
  --md-on-primary: #ffffff;
  --md-primary-container: #d6e2ff;
  --md-on-primary-container: #001a4b;

  /* Secondary */
  --md-secondary: #565e71;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #dae2f9;
  --md-on-secondary-container: #131c2b;
  --md-success:             #1B6B3A;
  --md-success-container:   #AFFBD0;
  /* Tertiary */
  --md-tertiary: #6f5575;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #f8d8fd;
  --md-on-tertiary-container: #28132f;

  /* Error */
  --md-error: #ba1a1a;
  --md-on-error: #ffffff;
  --md-error-container: #ffdad6;
  --md-on-error-container: #410002;

  /* Surface */
  --md-surface: #faf8ff;
  --md-surface-dim: #d9d9e0;
  --md-surface-bright: #faf8ff;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #f3f3fa;
  --md-surface-container: #eeedf4;
  --md-surface-container-high: #e8e7ef;
  --md-surface-container-highest: #e2e2e9;
  --md-on-surface: #1a1b20;
  --md-on-surface-variant: #44474f;
  --md-outline: #74777f;
  --md-outline-variant: #c4c6d0;

  /* Inverse */
  --md-inverse-surface: #2f3036;
  --md-inverse-on-surface: #f1f0f7;
  --md-inverse-primary: #aac7ff;

  /* Extended */
  --md-surface-tint: #1a56db;
  --md-shadow: #000000;
  --md-scrim: #000000;

  /* Accent */
  --accent-blue: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #1a56db 0%, #3b82f6 50%, #60a5fa 100%);
  --accent-glow: 0 0 80px rgba(26, 86, 219, 0.15);

  /* Elevation */
  --md-elevation-1: 0 1px 3px 1px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --md-elevation-2: 0 2px 6px 2px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.04);
  --md-elevation-4: 0 6px 10px 4px rgba(0,0,0,0.08), 0 2px 3px rgba(0,0,0,0.04);
  --md-elevation-5: 0 8px 12px 6px rgba(0,0,0,0.08), 0 4px 4px rgba(0,0,0,0.03);

  /* Shape */
  --md-shape-xs: 4px;
  --md-shape-sm: 8px;
  --md-shape-md: 12px;
  --md-shape-lg: 16px;
  --md-shape-xl: 28px;
  --md-shape-full: 9999px;

  /* Motion */
  --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-emphasized-decel: cubic-bezier(0.05, 0.7, 0.1, 1);
  --md-motion-emphasized-accel: cubic-bezier(0.3, 0, 0.8, 0.15);
  --md-duration-short: 200ms;
  --md-duration-medium: 400ms;
  --md-duration-long: 600ms;
  --md-duration-extra-long: 800ms;

  /* Typography Scale */
  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;



  --shape-xs:  4px; --shape-sm: 8px; --shape-md: 12px;
  --shape-lg: 16px; --shape-xl: 28px; --shape-full: 9999px;

  --motion-standard: cubic-bezier(.2,0,0,1);
  --motion-decel:    cubic-bezier(0,0,0,1);
  --motion-spring:   cubic-bezier(.34,1.56,.64,1);
  --dur-short:  150ms; --dur-medium: 300ms;
  --dur-long:   500ms; --dur-extra:  700ms;

    --sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:20px;
  --sp-6:24px;--sp-8:32px;--sp-10:40px;--sp-12:48px;
  --sp-16:64px;--sp-20:80px;--sp-24:96px;

  --max-width: 1200px;
  --nav-height: 72px;
}

/* Material Symbols Config */
.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  background-color: var(--md-surface);
  color: var(--md-on-surface);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--md-primary);
  text-decoration: none;
  transition: color var(--md-duration-short) var(--md-motion-standard);
}

a:hover {
  color: var(--accent-blue);
}

img {
  max-width: 100%;
  display: block;
}

/* --- Typography --- */
.display-large {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.display-medium {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.display-small {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.headline-large {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
}

.headline-medium {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
}

.headline-small {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
}

.title-large {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
}

.title-medium {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.01em;
}

.body-large {
  font-size: 1.0625rem;
  line-height: 1.7;
}

.body-medium {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.body-small {
  font-size: 0.8125rem;
  line-height: 1.5;
}

.label-large {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.label-medium {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 48px 0;
}

.section-lg {
  padding: 120px 0;
}

/* --- Grid System --- */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* --- Navigation Bar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 248, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--md-outline-variant);
  transition: all var(--md-duration-medium) var(--md-motion-standard);
}

.navbar.scrolled {
  box-shadow: var(--md-elevation-2);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--md-on-surface);
}

.navbar-logo {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--md-shape-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
}

.nav-logo{display:flex;align-items:center;gap:var(--sp-3);text-decoration:none;flex-shrink:0}
.nav-logo-icon{
  width:38px;height:38px;
  background:var(--md-primary);
  border-radius:var(--shape-sm);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 2px 10px rgba(26,86,219,.35);
  transition:transform var(--dur-medium) var(--motion-spring);
}
.nav-logo:hover .nav-logo-icon{transform:rotate(-8deg) scale(1.05)}
.nav-logo-icon svg{width:22px;height:22px;color:white}
.nav-logo-text{font-family:var(--font-display);font-size:1.125rem;font-weight:700;color:var(--md-on-surface)}
.nav-logo-text span{color:var(--md-primary)}


.navbar-brand-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--md-on-surface);
}

.navbar-brand-text span {
  color: var(--md-primary);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.navbar-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--md-shape-full);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  transition: all var(--md-duration-short) var(--md-motion-standard);
  position: relative;
}

.navbar-links a:hover {
  background: var(--md-surface-container);
  color: var(--md-on-surface);
}

.navbar-links a.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  font-weight: 600;
}

.navbar-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--md-surface-container);
  border-radius: var(--md-shape-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--md-duration-short) var(--md-motion-standard);
}

.navbar-search:hover {
  background: var(--md-surface-container-high);
  border-color: var(--md-outline-variant);
}

.navbar-search .material-symbols-rounded {
  font-size: 18px;
  color: var(--md-on-surface-variant);
}

.navbar-search span {
  font-size: 0.8125rem;
  color: var(--md-outline);
}

.navbar-search kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 6px;
  background: var(--md-surface-container-highest);
  border-radius: var(--md-shape-xs);
  color: var(--md-outline);
}

/* Mobile menu button */
.navbar-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--md-shape-full);
  color: var(--md-on-surface);
  transition: background var(--md-duration-short) var(--md-motion-standard);
}

.navbar-mobile-toggle:hover {
  background: var(--md-surface-container);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--md-surface);
  z-index: 999;
  padding: 16px;
  overflow-y: auto;
  animation: slideDown var(--md-duration-medium) var(--md-motion-emphasized);
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--md-shape-lg);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  transition: all var(--md-duration-short) var(--md-motion-standard);
}

.mobile-nav a:hover,
.mobile-nav a.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

@media (max-width: 1024px) {
  .navbar-links, .navbar-search {
    display: none;
  }
  .navbar-mobile-toggle {
    display: flex;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  border: none;
  cursor: pointer;
  transition: all var(--md-duration-short) var(--md-motion-standard);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity var(--md-duration-short) var(--md-motion-standard);
}

.btn:hover::after {
  opacity: 0.08;
}

.btn:active::after {
  opacity: 0.12;
}

/* Filled Button */
.btn-filled {
  padding: 12px 28px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-radius: var(--md-shape-full);
  box-shadow: var(--md-elevation-1);
}

.btn-filled:hover {
  box-shadow: var(--md-elevation-2);
  color: var(--md-on-primary);
}

/* Tonal Button */
.btn-tonal {
  padding: 12px 28px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-radius: var(--md-shape-full);
}

/* Outlined Button */
.btn-outlined {
  padding: 11px 27px;
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-full);
}

.btn-outlined:hover {
  border-color: var(--md-primary);
  background: var(--md-primary-container);
  color: var(--md-primary);
}

/* Text Button */
.btn-text {
  padding: 12px 16px;
  background: transparent;
  color: var(--md-primary);
  border-radius: var(--md-shape-full);
}

/* Icon Button */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  color: var(--md-on-surface-variant);
  border-radius: var(--md-shape-full);
}

/* FAB */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-lg);
  border: none;
  cursor: pointer;
  box-shadow: var(--md-elevation-3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  transition: all var(--md-duration-medium) var(--md-motion-standard);
}

.fab:hover {
  box-shadow: var(--md-elevation-4);
}

/* --- Cards --- */
.card {
  background: var(--md-surface-container-lowest);
  border-radius: var(--md-shape-lg);
  border: 1px solid var(--md-outline-variant);
  padding: 24px;
  transition: all var(--md-duration-medium) var(--md-motion-standard);
  position: relative;
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--md-elevation-2);
  border-color: var(--md-primary);
  transform: translateY(-2px);
}

.card-elevated {
  background: var(--md-surface-container-low);
  border: none;
  box-shadow: var(--md-elevation-1);
}

.card-elevated:hover {
  box-shadow: var(--md-elevation-3);
}

.card-filled {
  background: var(--md-surface-container-high);
  border: none;
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.card-icon .material-symbols-rounded {
  font-size: 24px;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--md-on-surface);
}

.card p {
  color: var(--md-on-surface-variant);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* --- Chips --- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--md-shape-full);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  border: 1px solid var(--md-outline-variant);
  background: transparent;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  transition: all var(--md-duration-short) var(--md-motion-standard);
}

.chip:hover {
  background: var(--md-surface-container);
}

.chip.active {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  border-color: transparent;
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* --- Code Blocks --- */
.code-block {
  background: var(--md-inverse-surface);
  color: var(--md-inverse-on-surface);
  border-radius: var(--md-shape-md);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  overflow-x: auto;
  position: relative;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.code-block-lang {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--md-inverse-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-copy-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  background: rgba(255,255,255,0.1);
  border: none;
  border-radius: var(--md-shape-sm);
  color: var(--md-inverse-on-surface);
  font-family: var(--font-display);
  font-size: 0.75rem;
  cursor: pointer;
  transition: background var(--md-duration-short) var(--md-motion-standard);
}

.code-copy-btn:hover {
  background: rgba(255,255,255,0.2);
}

.code-copy-btn .material-symbols-rounded {
  font-size: 16px;
}

/* Syntax colors */
.code-keyword { color: #c792ea; }
.code-string { color: #c3e88d; }
.code-comment { color: #676e95; }
.code-function { color: #82aaff; }
.code-number { color: #f78c6c; }
.code-type { color: #ffcb6b; }
.code-operator { color: #89ddff; }

/* Inline code */
code {
  font-family: var(--font-mono);
  /* font-size: 0.875em; */
  padding: 2px 8px;
  /* background: var(--md-surface-container-high); */
  border-radius: var(--md-shape-xs);
  /* color: var(--md-primary); */
}

/* --- Hero Section --- */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(26,86,219,0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.06) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 15s ease-in-out infinite reverse;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 6px 6px 16px;
  background: var(--md-primary-container);
  border-radius: var(--md-shape-full);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--md-on-primary-container);
  margin-bottom: 24px;
}

.hero-badge .badge-tag {
  padding: 4px 12px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-radius: var(--md-shape-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.1875rem;
  color: var(--md-on-surface-variant);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-visual {
  margin-top: 64px;
  border-radius: var(--md-shape-xl);
  /* overflow: hidden; */
  border: 1px solid var(--md-outline-variant);
  box-shadow: var(--md-elevation-3);
  background: var(--md-surface-container-lowest);
}

/* --- Page Header --- */
.page-header {
  padding: 120px 0 48px;
  background: var(--md-surface-container-low);
  border-bottom: 1px solid var(--md-outline-variant);
}

.page-header .overline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.page-header .overline .material-symbols-rounded {
  font-size: 20px;
  color: var(--md-primary);
}

.page-header .overline span {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-primary);
}

.page-header h1 {
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.0625rem;
  color: var(--md-on-surface-variant);
  max-width: 600px;
  line-height: 1.7;
}

/* --- Section Headers --- */
.section-header {
  margin-bottom: 48px;
}

.section-header .overline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.section-header .overline .material-symbols-rounded {
  font-size: 18px;
  color: var(--md-primary);
}

.section-header .overline span {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-primary);
}

.section-header h2 {
  margin-bottom: 8px;
}

.section-header p {
  color: var(--md-on-surface-variant);
  font-size: 1rem;
  max-width: 560px;
}

/* --- Feature Grid Items --- */
.feature-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: var(--md-shape-lg);
  transition: background var(--md-duration-short) var(--md-motion-standard);
}

.feature-item:hover {
  background: var(--md-surface-container);
}

.feature-item-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-item-icon .material-symbols-rounded {
  font-size: 20px;
}

.feature-item h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  line-height: 1.5;
}

/* --- Stats Bar --- */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 64px;
  padding: 40px 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--md-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
}

/* --- Search Modal --- */
.search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 2000;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  animation: fadeIn var(--md-duration-short) var(--md-motion-standard);
}

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

.search-modal {
  width: 100%;
  max-width: 640px;
  background: var(--md-surface-container-lowest);
  border-radius: var(--md-shape-xl);
  box-shadow: var(--md-elevation-5);
  overflow: hidden;
  animation: scaleIn var(--md-duration-medium) var(--md-motion-emphasized);
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--md-outline-variant);
}

.search-input-wrap .material-symbols-rounded {
  font-size: 24px;
  color: var(--md-on-surface-variant);
}

.search-input-wrap input {
  flex: 1;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  color: var(--md-on-surface);
  background: transparent;
}

.search-input-wrap input::placeholder {
  color: var(--md-outline);
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: 8px;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--md-shape-md);
  cursor: pointer;
  transition: background var(--md-duration-short) var(--md-motion-standard);
}

.search-result-item:hover {
  background: var(--md-surface-container);
}

.search-result-item .material-symbols-rounded {
  font-size: 20px;
  color: var(--md-on-surface-variant);
}

.search-result-item .result-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.9375rem;
}

.search-result-item .result-type {
  font-size: 0.75rem;
  color: var(--md-outline);
}

.search-footer {
  padding: 12px 24px;
  border-top: 1px solid var(--md-outline-variant);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.search-footer span {
  font-size: 0.75rem;
  color: var(--md-outline);
}

/* --- Newsletter Section --- */
.newsletter {
  background: var(--md-primary-container);
  border-radius: var(--md-shape-xl);
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.newsletter::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(26,86,219,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.newsletter h2 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--md-on-primary-container);
  position: relative;
}

.newsletter p {
  color: var(--md-on-primary-container);
  opacity: 0.8;
  margin-bottom: 28px;
  position: relative;
}

.newsletter-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}

.newsletter-form input {
  flex: 1;
  padding: 14px 20px;
  border: 1px solid rgba(26,86,219,0.2);
  border-radius: var(--md-shape-full);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  background: var(--md-surface-container-lowest);
  color: var(--md-on-surface);
  outline: none;
  transition: border-color var(--md-duration-short) var(--md-motion-standard);
}

.newsletter-form input:focus {
  border-color: var(--md-primary);
}

@media (max-width: 640px) {
  .newsletter {
    padding: 40px 24px;
  }
  .newsletter-form {
    flex-direction: column;
  }
}

/* --- Footer --- */
.footer {
  background: var(--md-surface-container-low);
  border-top: 1px solid var(--md-outline-variant);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--md-on-surface-variant);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-on-surface);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: 0.9375rem;
  color: var(--md-on-surface-variant);
  transition: color var(--md-duration-short) var(--md-motion-standard);
}

.footer-col a:hover {
  color: var(--md-primary);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--md-outline-variant);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--md-outline);
}

.footer-social {
  display: flex;
  gap: 8px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: var(--md-shape-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-on-surface-variant);
  transition: all var(--md-duration-short) var(--md-motion-standard);
}

.footer-social a:hover {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Breadcrumbs --- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 0.8125rem;
}

.breadcrumbs a {
  color: var(--md-on-surface-variant);
}

.breadcrumbs a:hover {
  color: var(--md-primary);
}

.breadcrumbs .separator {
  color: var(--md-outline);
}

.breadcrumbs .current {
  color: var(--md-on-surface);
  font-weight: 500;
}

/* --- Table of Contents --- */
.toc {
  position: sticky;
  top: 100px;
  padding: 20px;
  border-left: 2px solid var(--md-outline-variant);
}

.toc h4 {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-outline);
  margin-bottom: 12px;
}

.toc a {
  display: block;
  padding: 6px 0;
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  transition: all var(--md-duration-short) var(--md-motion-standard);
}

.toc a:hover,
.toc a.active {
  color: var(--md-primary);
}

/* --- Article Content --- */
.article-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 48px;
  margin-bottom: 16px;
  color: var(--md-on-surface);
}

.article-content h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  color: var(--md-on-surface);
}

.article-content p {
  margin-bottom: 16px;
  color: var(--md-on-surface-variant);
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--md-on-surface-variant);
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

/* --- Callout Boxes --- */
.callout {
  padding: 20px 24px;
  border-radius: var(--md-shape-md);
  margin: 24px 0;
  display: flex;
  gap: 12px;
}

.callout-info {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.callout-warning {
  background: #fff3cd;
  color: #664d03;
}

.callout-error {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
}

.callout-success {
  background: #d1fae5;
  color: #065f46;
}

.callout .material-symbols-rounded {
  font-size: 20px;
  margin-top: 2px;
}

.callout p {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
  color: inherit;
}

/* --- Dividers --- */
.divider {
  border: none;
  border-top: 1px solid var(--md-outline-variant);
  margin: 48px 0;
}

/* --- Badges & Tags --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--md-shape-full);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
}

.tag-primary {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.tag-error {
  background: var(--md-error-container);
  color: var(--md-on-error-container);
}

.tag-success {
  background: #d1fae5;
  color: #065f46;
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--md-duration-long) var(--md-motion-emphasized),
              transform var(--md-duration-long) var(--md-motion-emphasized);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--md-duration-long) var(--md-motion-emphasized),
              transform var(--md-duration-long) var(--md-motion-emphasized);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--md-duration-long) var(--md-motion-emphasized),
              transform var(--md-duration-long) var(--md-motion-emphasized);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--md-duration-long) var(--md-motion-emphasized),
              transform var(--md-duration-long) var(--md-motion-emphasized);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0ms; }
.stagger-2 { transition-delay: 80ms; }
.stagger-3 { transition-delay: 160ms; }
.stagger-4 { transition-delay: 240ms; }
.stagger-5 { transition-delay: 320ms; }
.stagger-6 { transition-delay: 400ms; }

/* --- Keyframe Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(30px, -30px); }
  66% { transform: translate(-20px, 20px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  50% { border-color: transparent; }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Gradient text animation */
.gradient-text {
  background: linear-gradient(135deg, var(--md-primary), var(--accent-blue), #818cf8, var(--md-primary));
  background-size: 300% 300%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
}

/* --- Particle/Dot Pattern Background --- */
.dot-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--md-outline-variant) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.4;
  pointer-events: none;
}

/* --- Utility Classes --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--md-primary); }
.text-muted { color: var(--md-on-surface-variant); }
.text-outline { color: var(--md-outline); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.gap-32 { gap: 32px; }
.gap-48 { gap: 48px; }

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }

.w-full { width: 100%; }

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--md-outline-variant);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--md-outline);
}

/* Selection */
::selection {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

/* --- Responsive Adjustments --- */
@media (max-width: 640px) {
  .section { padding: 48px 0; }
  .section-lg { padding: 72px 0; }
  .hero { padding: 100px 0 48px; }
  .page-header { padding: 88px 0 32px; }
  .stats-bar { gap: 32px; }
}

/* --- Two-column article layout --- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 64px;
  align-items: start;
}

@media (max-width: 1024px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .toc {
    display: none;
  }
}

/* --- Extension Card Specific --- */
.extension-card {
  border-radius: var(--md-shape-xl);
  overflow: hidden;
}

.extension-card-img {
  height: 200px;
  background: var(--md-surface-container);
  display: flex;
  align-items: center;
  justify-content: center;
}

.extension-card-body {
  padding: 24px;
}

/* --- Tool Interactive Area --- */
.tool-area {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-xl);
  overflow: hidden;
}

.tool-area-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--md-surface-container-low);
  border-bottom: 1px solid var(--md-outline-variant);
}

.tool-area-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 300px;
}

.tool-area-body > div {
  padding: 20px;
}

.tool-area-body > div:first-child {
  border-right: 1px solid var(--md-outline-variant);
}

.tool-area textarea {
  width: 100%;
  height: 100%;
  min-height: 240px;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  background: transparent;
  color: var(--md-on-surface);
}

@media (max-width: 768px) {
  .tool-area-body {
    grid-template-columns: 1fr;
  }
  .tool-area-body > div:first-child {
    border-right: none;
    border-bottom: 1px solid var(--md-outline-variant);
  }
}

/* --- Loading Skeleton --- */
.skeleton {
  background: linear-gradient(90deg, var(--md-surface-container) 25%, var(--md-surface-container-high) 50%, var(--md-surface-container) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--md-shape-sm);
}

/* --- Toast Notification --- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--md-inverse-surface);
  color: var(--md-inverse-on-surface);
  padding: 14px 24px;
  border-radius: var(--md-shape-md);
  font-size: 0.875rem;
  box-shadow: var(--md-elevation-3);
  z-index: 3000;
  transition: transform var(--md-duration-medium) var(--md-motion-emphasized);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border: none;
  border-radius: var(--md-shape-lg);
  cursor: pointer;
  box-shadow: var(--md-elevation-2);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 800;
  opacity: 0;
  pointer-events: none;
  transition: all var(--md-duration-medium) var(--md-motion-standard);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  box-shadow: var(--md-elevation-3);
  background: var(--md-primary);
  color: var(--md-on-primary);
}

/* Hero visual responsive */
@media (max-width: 768px) {
  .hero { padding: 110px 0 60px; }

  .hero-subtitle {
    font-size: 1rem;
    max-width: 100%;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-visual {
    margin-bottom: 48px; /* room for float cards below */
  }

  .hero-visual .code-block {
    font-size: 0.75rem;
    padding: 14px 16px;
  }

  .hero-visual .code-block pre {
    overflow-x: auto;
  }
}

@media (max-width: 480px) {
  .hero-visual {
    margin-bottom: 0;
  }

  .hero-visual .code-block {
    font-size: 0.7rem;
    padding: 12px 14px;
    line-height: 1.6;
  }
}