/* ===================================================================
   ImageGlass Official Website - Main Stylesheet
   Version: 1.0.0
   Domain: www.imageglass.net.cn
   Design: Flat, Modern, Professional
   Color system derived from ImageGlass logo gradient
   =================================================================== */

/* ---------- CSS Variables ---------- */
:root {
  /* Brand colors from logo gradient */
  --ig-blue: #4A5FE8;
  --ig-blue-dark: #3A4ED1;
  --ig-blue-light: #5B6CF9;
  --ig-cyan: #00D4FF;
  --ig-cyan-dark: #00B8E6;
  --ig-cyan-light: #2DE2E6;
  --ig-gradient: linear-gradient(135deg, #4A5FE8 0%, #00D4FF 100%);
  --ig-gradient-soft: linear-gradient(135deg, rgba(74,95,232,0.08) 0%, rgba(0,212,255,0.08) 100%);
  --ig-gradient-hover: linear-gradient(135deg, #3A4ED1 0%, #00B8E6 100%);

  /* Neutrals */
  --ig-bg: #FFFFFF;
  --ig-bg-alt: #F8FAFC;
  --ig-bg-dark: #0F172A;
  --ig-surface: #FFFFFF;
  --ig-border: #E2E8F0;
  --ig-border-light: #F1F5F9;

  /* Text */
  --ig-text: #1E293B;
  --ig-text-muted: #64748B;
  --ig-text-light: #94A3B8;
  --ig-text-inverse: #FFFFFF;

  /* Status */
  --ig-success: #10B981;
  --ig-warning: #F59E0B;
  --ig-danger: #EF4444;

  /* Typography */
  --ig-font-sans: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --ig-font-mono: 'SF Mono', 'Fira Code', Consolas, 'Liberation Mono', monospace;

  /* Spacing scale */
  --ig-space-xs: 0.25rem;
  --ig-space-sm: 0.5rem;
  --ig-space-md: 1rem;
  --ig-space-lg: 1.5rem;
  --ig-space-xl: 2rem;
  --ig-space-2xl: 3rem;
  --ig-space-3xl: 4rem;
  --ig-space-4xl: 6rem;

  /* Radii */
  --ig-radius-sm: 6px;
  --ig-radius-md: 10px;
  --ig-radius-lg: 16px;
  --ig-radius-xl: 24px;
  --ig-radius-full: 9999px;

  /* Shadows */
  --ig-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --ig-shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --ig-shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --ig-shadow-xl: 0 20px 40px -12px rgba(74, 95, 232, 0.18), 0 8px 16px -4px rgba(15, 23, 42, 0.06);
  --ig-shadow-glow: 0 0 0 4px rgba(74, 95, 232, 0.12);

  /* Layout */
  --ig-container: 1200px;
  --ig-header-h: 72px;

  /* Motion */
  --ig-transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --ig-transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--ig-header-h) + 1rem);
}

body {
  font-family: var(--ig-font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ig-text);
  background: var(--ig-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--ig-blue);
  text-decoration: none;
  transition: color var(--ig-transition);
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--ig-container);
  margin-inline: auto;
  padding-inline: var(--ig-space-lg);
}

.section {
  padding-block: var(--ig-space-4xl);
}

.section--alt {
  background: var(--ig-bg-alt);
}

.section--gradient {
  background: var(--ig-gradient-soft);
}

.section__head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--ig-space-3xl);
}

.section__eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ig-blue);
  background: rgba(74, 95, 232, 0.08);
  padding: 0.375rem 0.875rem;
  border-radius: var(--ig-radius-full);
  margin-bottom: var(--ig-space-md);
}

.section__title {
  font-size: clamp(1.875rem, 1.4rem + 2vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ig-text);
  margin-bottom: var(--ig-space-md);
}

.section__title .grad {
  background: var(--ig-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.section__subtitle {
  font-size: 1.0625rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

/* ---------- Header / Navigation ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--ig-border-light);
  height: var(--ig-header-h);
  display: flex;
  align-items: center;
}

.header__inner {
  width: 100%;
  max-width: var(--ig-container);
  margin-inline: auto;
  padding-inline: var(--ig-space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ig-space-xl);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--ig-text);
  letter-spacing: -0.01em;
}

.brand__logo {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  object-fit: cover;
  flex-shrink: 0;
}

.brand__name {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
}

.brand__name span {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--ig-text-light);
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--ig-space-xs);
}

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  border-radius: var(--ig-radius-md);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ig-text-muted);
  transition: all var(--ig-transition);
}

.nav__link:hover {
  color: var(--ig-blue);
  background: rgba(74, 95, 232, 0.06);
}

.nav__link.is-active {
  color: var(--ig-blue);
  background: rgba(74, 95, 232, 0.08);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--ig-space-md);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--ig-radius-md);
  align-items: center;
  justify-content: center;
  color: var(--ig-text);
}

.nav-toggle:hover {
  background: var(--ig-border-light);
}

.nav-toggle__icon {
  width: 22px;
  height: 22px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--ig-radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: all var(--ig-transition);
  white-space: nowrap;
  border: 1.5px solid transparent;
  text-decoration: none;
}

.btn--primary {
  background: var(--ig-gradient);
  color: var(--ig-text-inverse);
  box-shadow: var(--ig-shadow-md);
}

.btn--primary:hover {
  background: var(--ig-gradient-hover);
  color: var(--ig-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--ig-shadow-lg);
}

.btn--secondary {
  background: var(--ig-surface);
  color: var(--ig-text);
  border-color: var(--ig-border);
  box-shadow: var(--ig-shadow-sm);
}

.btn--secondary:hover {
  border-color: var(--ig-blue);
  color: var(--ig-blue);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--ig-text);
  border-color: transparent;
}

.btn--ghost:hover {
  background: var(--ig-border-light);
  color: var(--ig-blue);
}

.btn--lg {
  padding: 0.9375rem 2rem;
  font-size: 1rem;
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn--block {
  display: flex;
  width: 100%;
}

.btn__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: var(--ig-space-4xl) var(--ig-space-3xl);
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(74, 95, 232, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(0, 212, 255, 0.12) 0%, transparent 45%),
    var(--ig-bg);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(74, 95, 232, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 95, 232, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--ig-space-3xl);
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem 0.375rem 0.5rem;
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ig-text-muted);
  margin-bottom: var(--ig-space-lg);
  box-shadow: var(--ig-shadow-sm);
}

.hero__badge-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  background: var(--ig-gradient);
  color: white;
  border-radius: var(--ig-radius-full);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero__title {
  font-size: clamp(2.25rem, 1.6rem + 3vw, 3.75rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ig-text);
  margin-bottom: var(--ig-space-lg);
}

.hero__title .grad {
  background: var(--ig-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero__desc {
  font-size: 1.125rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
  margin-bottom: var(--ig-space-xl);
  max-width: 560px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ig-space-md);
  margin-bottom: var(--ig-space-xl);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ig-space-xl);
  padding-top: var(--ig-space-lg);
  border-top: 1px solid var(--ig-border-light);
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
}

.hero__meta-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--ig-text);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero__meta-num .grad {
  background: var(--ig-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__meta-label {
  font-size: 0.8125rem;
  color: var(--ig-text-light);
  margin-top: 0.25rem;
}

/* Hero visual */
.hero__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--ig-radius-xl);
  background: var(--ig-gradient);
  padding: 1.5rem;
  box-shadow: var(--ig-shadow-xl);
  overflow: hidden;
}

.hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.25) 0%, transparent 50%),
    radial-gradient(circle at 80% 90%, rgba(0,212,255,0.4) 0%, transparent 50%);
  pointer-events: none;
}

.hero__app {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--ig-bg);
  border-radius: var(--ig-radius-lg);
  box-shadow: var(--ig-shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.hero__app-bar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.75rem 1rem;
  background: var(--ig-bg-alt);
  border-bottom: 1px solid var(--ig-border-light);
}

.hero__app-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ig-border);
}

.hero__app-dot:nth-child(1) { background: #FF5F57; }
.hero__app-dot:nth-child(2) { background: #FEBC2E; }
.hero__app-dot:nth-child(3) { background: #28C840; }

.hero__app-title {
  margin-left: auto;
  margin-right: auto;
  font-size: 0.75rem;
  color: var(--ig-text-light);
  font-weight: 500;
}

.hero__app-body {
  flex: 1;
  display: grid;
  grid-template-columns: 64px 1fr;
  background: var(--ig-bg);
}

.hero__app-side {
  background: var(--ig-bg-alt);
  border-right: 1px solid var(--ig-border-light);
  padding: 0.75rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.hero__app-tool {
  width: 36px;
  height: 36px;
  border-radius: var(--ig-radius-sm);
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--ig-text-muted);
}

.hero__app-tool.is-active {
  background: var(--ig-gradient);
  color: white;
  border-color: transparent;
}

.hero__app-canvas {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background:
    repeating-conic-gradient(#F1F5F9 0% 25%, #FFFFFF 0% 50%) 50% / 24px 24px;
}

.hero__app-image {
  width: 80%;
  max-width: 220px;
  aspect-ratio: 4 / 3;
  border-radius: var(--ig-radius-md);
  background: var(--ig-gradient);
  position: relative;
  overflow: hidden;
  box-shadow: var(--ig-shadow-lg);
}

.hero__app-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.4) 0%, transparent 40%),
    radial-gradient(circle at 70% 70%, rgba(0,212,255,0.6) 0%, transparent 50%);
}

.hero__app-image::after {
  content: "90+";
  position: absolute;
  bottom: 0.5rem;
  right: 0.5rem;
  background: rgba(15,23,42,0.7);
  color: white;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0.125rem 0.5rem;
  border-radius: var(--ig-radius-full);
  backdrop-filter: blur(4px);
}

.hero__app-status {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--ig-text-light);
  font-family: var(--ig-font-mono);
}

/* ---------- Stats Strip ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--ig-space-lg);
  padding: var(--ig-space-xl) var(--ig-space-2xl);
  background: var(--ig-bg-dark);
  color: white;
  border-radius: var(--ig-radius-xl);
  margin-top: calc(var(--ig-space-3xl) * -1);
  position: relative;
  z-index: 2;
  box-shadow: var(--ig-shadow-xl);
}

.stats__item {
  text-align: center;
  padding: 0.5rem;
}

.stats__num {
  font-size: clamp(1.75rem, 1.3rem + 1.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #FFFFFF 0%, #00D4FF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
}

.stats__label {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.02em;
}

/* ---------- Feature Grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--ig-space-lg);
}

.feature-card {
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-lg);
  padding: var(--ig-space-xl);
  transition: all var(--ig-transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--ig-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--ig-transition-slow);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: var(--ig-shadow-lg);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--ig-radius-md);
  background: var(--ig-gradient-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--ig-space-md);
  color: var(--ig-blue);
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.feature-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ig-text);
  margin-bottom: var(--ig-space-sm);
  letter-spacing: -0.01em;
}

.feature-card__desc {
  font-size: 0.9375rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

/* ---------- Use Cases ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--ig-space-lg);
}

.usecase-card {
  display: flex;
  gap: var(--ig-space-lg);
  padding: var(--ig-space-xl);
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-lg);
  transition: all var(--ig-transition);
}

.usecase-card:hover {
  border-color: var(--ig-blue);
  box-shadow: var(--ig-shadow-lg);
  transform: translateY(-2px);
}

.usecase-card__visual {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border-radius: var(--ig-radius-md);
  background: var(--ig-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.75rem;
  font-weight: 700;
  box-shadow: var(--ig-shadow-md);
}

.usecase-card__content {
  flex: 1;
}

.usecase-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ig-text);
  margin-bottom: var(--ig-space-xs);
  letter-spacing: -0.01em;
}

.usecase-card__desc {
  font-size: 0.9375rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

/* ---------- Testimonials ---------- */
.testimonials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--ig-space-lg);
}

.testimonial-card {
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-lg);
  padding: var(--ig-space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--ig-space-md);
  position: relative;
  transition: all var(--ig-transition);
}

.testimonial-card:hover {
  border-color: var(--ig-blue);
  box-shadow: var(--ig-shadow-lg);
}

.testimonial-card__quote {
  font-size: 2rem;
  line-height: 1;
  color: var(--ig-blue);
  opacity: 0.2;
  font-family: Georgia, serif;
}

.testimonial-card__text {
  font-size: 0.9375rem;
  color: var(--ig-text);
  line-height: 1.75;
  flex: 1;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: var(--ig-space-md);
  border-top: 1px solid var(--ig-border-light);
}

.testimonial-card__avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ig-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.9375rem;
  flex-shrink: 0;
}

.testimonial-card__name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ig-text);
}

.testimonial-card__role {
  font-size: 0.8125rem;
  color: var(--ig-text-light);
}

.testimonial-card__rating {
  display: flex;
  gap: 0.125rem;
  color: #F59E0B;
  font-size: 0.875rem;
}

/* ---------- Format badges ---------- */
.format-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  max-width: 800px;
  margin: 0 auto;
}

.format-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ig-text);
  font-family: var(--ig-font-mono);
  letter-spacing: 0.02em;
  transition: all var(--ig-transition);
}

.format-badge:hover {
  background: var(--ig-gradient);
  color: white;
  border-color: transparent;
  transform: translateY(-1px);
}

.format-badge--accent {
  background: var(--ig-gradient-soft);
  border-color: rgba(74,95,232,0.2);
  color: var(--ig-blue);
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  position: relative;
  background: var(--ig-bg-dark);
  border-radius: var(--ig-radius-xl);
  padding: var(--ig-space-3xl);
  text-align: center;
  overflow: hidden;
  color: white;
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(74, 95, 232, 0.4) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 212, 255, 0.3) 0%, transparent 50%);
  pointer-events: none;
}

.cta-banner__inner {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
}

.cta-banner__title {
  font-size: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: var(--ig-space-md);
}

.cta-banner__desc {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.7;
  margin-bottom: var(--ig-space-xl);
}

.cta-banner .btn--primary {
  background: white;
  color: var(--ig-blue-dark);
}

.cta-banner .btn--primary:hover {
  background: rgba(255,255,255,0.92);
  color: var(--ig-blue-dark);
}

.cta-banner .btn--secondary {
  background: rgba(255,255,255,0.08);
  color: white;
  border-color: rgba(255,255,255,0.2);
}

.cta-banner .btn--secondary:hover {
  background: rgba(255,255,255,0.15);
  color: white;
  border-color: rgba(255,255,255,0.3);
}

/* ---------- Page header (interior pages) ---------- */
.page-hero {
  position: relative;
  padding-block: var(--ig-space-3xl);
  background:
    radial-gradient(circle at 15% 30%, rgba(74, 95, 232, 0.10) 0%, transparent 50%),
    radial-gradient(circle at 85% 70%, rgba(0, 212, 255, 0.10) 0%, transparent 50%),
    var(--ig-bg-alt);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(74, 95, 232, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 95, 232, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 75%);
}

.page-hero__inner {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--ig-text-light);
  margin-bottom: var(--ig-space-md);
}

.breadcrumb a {
  color: var(--ig-text-muted);
}

.breadcrumb a:hover {
  color: var(--ig-blue);
}

.breadcrumb__sep {
  color: var(--ig-text-light);
}

.page-hero__title {
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-bottom: var(--ig-space-md);
}

.page-hero__desc {
  font-size: 1.125rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

/* ---------- Download Cards ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(1fr);
  gap: var(--ig-space-lg);
}

.dl-card {
	width: 580px;
	margin: 0 auto;
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-lg);
  padding: var(--ig-space-xl);
  transition: all var(--ig-transition);
  position: relative;
}

.dl-card--featured {
  background: var(--ig-bg-dark);
  color: white;
  border-color: transparent;
}

.dl-card--featured .dl-card__title,
.dl-card--featured .dl-card__desc,
.dl-card--featured .dl-card__list li {
  color: white;
}

.dl-card--featured .dl-card__list li::before {
  color: var(--ig-cyan);
}

.dl-card__tag {
  position: absolute;
  top: var(--ig-space-lg);
  right: var(--ig-space-lg);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: var(--ig-radius-full);
  background: var(--ig-gradient);
  color: white;
}

.dl-card__tag--free {
  background: rgba(16, 185, 129, 0.12);
  color: var(--ig-success);
}

.dl-card--featured .dl-card__tag--free {
  background: rgba(16, 185, 129, 0.2);
  color: #6EE7B7;
}

.dl-card__title {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: var(--ig-space-sm);
}

.dl-card__desc {
  font-size: 0.9375rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
  margin-bottom: var(--ig-space-lg);
}

.dl-card__list {
  margin-bottom: var(--ig-space-xl);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dl-card__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  color: var(--ig-text);
  line-height: 1.6;
}

.dl-card__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--ig-success);
  font-weight: 700;
}

.dl-card__price {
  font-size: 0.8125rem;
  color: var(--ig-text-light);
  margin-bottom: var(--ig-space-sm);
}

.dl-card--featured .dl-card__price {
  color: rgba(255,255,255,0.6);
}

.dl-card__price strong {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--ig-text);
  margin-top: 0.25rem;
}

.dl-card--featured .dl-card__price strong {
  color: white;
}

/* ---------- Tables ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-lg);
  background: var(--ig-surface);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.table th,
.table td {
  padding: 0.875rem 1.125rem;
  text-align: left;
  border-bottom: 1px solid var(--ig-border-light);
}

.table thead th {
  background: var(--ig-bg-alt);
  font-weight: 600;
  color: var(--ig-text);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background: var(--ig-bg-alt);
}

.table .yes { color: var(--ig-success); font-weight: 600; }
.table .no { color: var(--ig-text-light); }
.table .check { color: var(--ig-blue); font-weight: 600; }

/* ---------- FAQ / Accordion ---------- */
.faq {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--ig-space-sm);
}

.faq__item {
  background: var(--ig-surface);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-md);
  overflow: hidden;
  transition: all var(--ig-transition);
}

.faq__item.is-open {
  border-color: var(--ig-blue);
  box-shadow: var(--ig-shadow-md);
}

.faq__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ig-space-md);
  padding: var(--ig-space-md) var(--ig-space-lg);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ig-text);
  text-align: left;
  background: transparent;
}

.faq__q:hover {
  background: var(--ig-bg-alt);
}

.faq__q-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--ig-blue);
  transition: transform var(--ig-transition);
}

.faq__item.is-open .faq__q-icon {
  transform: rotate(45deg);
}

.faq__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--ig-transition-slow);
}

.faq__item.is-open .faq__a {
  max-height: 600px;
}

.faq__a-inner {
  padding: 0 var(--ig-space-lg) var(--ig-space-lg);
  font-size: 0.9375rem;
  color: var(--ig-text-muted);
  line-height: 1.75;
}

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--ig-space-xl);
  position: relative;
}

.steps::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 16.66%;
  right: 16.66%;
  height: 2px;
  background: linear-gradient(90deg, var(--ig-blue) 0%, var(--ig-cyan) 100%);
  opacity: 0.3;
  z-index: 0;
}

.step {
  position: relative;
  text-align: center;
  z-index: 1;
}

.step__num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--ig-surface);
  border: 2px solid var(--ig-blue);
  color: var(--ig-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: var(--ig-space-md);
  position: relative;
  z-index: 1;
}

.step:nth-child(2) .step__num { border-color: #2D9CDB; color: #2D9CDB; }
.step:nth-child(3) .step__num { border-color: var(--ig-cyan); color: var(--ig-cyan-dark); }

.step__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ig-text);
  margin-bottom: var(--ig-space-xs);
}

.step__desc {
  font-size: 0.9375rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

/* ---------- Code blocks ---------- */
.code-block {
  background: var(--ig-bg-dark);
  border-radius: var(--ig-radius-md);
  padding: var(--ig-space-md) var(--ig-space-lg);
  overflow-x: auto;
  position: relative;
  margin: var(--ig-space-md) 0;
}

.code-block__lang {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 0.6875rem;
  color: rgba(255,255,255,0.4);
  font-family: var(--ig-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-block code {
  font-family: var(--ig-font-mono);
  font-size: 0.875rem;
  color: #E2E8F0;
  line-height: 1.7;
}

.code-block .prompt { color: var(--ig-cyan); }
.code-block .cmd { color: #FFFFFF; }
.code-block .flag { color: #FCD34D; }
.code-block .str { color: #86EFAC; }

/* ---------- Footer ---------- */
.footer {
  background: var(--ig-bg-dark);
  color: rgba(255,255,255,0.7);
  padding-block: var(--ig-space-3xl) var(--ig-space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--ig-space-2xl);
  margin-bottom: var(--ig-space-2xl);
}

.footer__brand .brand {
  color: white;
  margin-bottom: var(--ig-space-md);
}

.footer__brand .brand__name span {
  color: rgba(255,255,255,0.5);
}

.footer__tagline {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-bottom: var(--ig-space-md);
  max-width: 320px;
}

.footer__social {
  display: flex;
  gap: 0.5rem;
}

.footer__social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--ig-radius-md);
  background: rgba(255,255,255,0.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  transition: all var(--ig-transition);
}

.footer__social-link:hover {
  background: var(--ig-gradient);
  color: white;
  transform: translateY(-2px);
}

.footer__col-title {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: white;
  margin-bottom: var(--ig-space-md);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer__list a {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--ig-transition);
}

.footer__list a:hover {
  color: var(--ig-cyan);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--ig-space-md);
  padding-top: var(--ig-space-xl);
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.875rem;
  color: rgba(255,255,255,0.5);
}

.footer__bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ig-space-lg);
}

.footer__bottom-links a {
  color: rgba(255,255,255,0.5);
}

.footer__bottom-links a:hover {
  color: var(--ig-cyan);
}

/* ---------- Download Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--ig-space-lg);
}

.modal.is-open {
  display: flex;
  animation: modalFadeIn 200ms ease-out;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
button { outline: none } 
.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.modal__dialog {
  position: relative;
  width: 100%;
  max-width: 580px;
  background: var(--ig-surface);
  border-radius: var(--ig-radius-xl);
  box-shadow: var(--ig-shadow-xl);
  overflow: hidden;
  animation: modalSlideUp 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.modal__header {
  position: relative;
  padding: var(--ig-space-2xl) var(--ig-space-2xl) var(--ig-space-lg);
  background: var(--ig-gradient);
  color: white;
  text-align: center;
}

.modal__header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(0,212,255,0.3) 0%, transparent 50%);
  pointer-events: none;
}

.modal__close {
  position: absolute;
  top: var(--ig-space-md);
  right: var(--ig-space-md);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: background var(--ig-transition);
}

.modal__close:hover {
  background: rgba(255,255,255,0.3);
}

.modal__title {
  position: relative;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: var(--ig-space-xs);
}

.modal__subtitle {
  position: relative;
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.85);
}

.modal__body {
  padding: var(--ig-space-2xl);
}

.modal__qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--ig-space-lg);
  margin-bottom: var(--ig-space-xl);
}

.qr-card {
  text-align: center;
  padding: var(--ig-space-lg);
  background: var(--ig-bg-alt);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-md);
  transition: all var(--ig-transition);
}

.qr-card:hover {
  border-color: var(--ig-blue);
  background: var(--ig-surface);
}

.qr-card__img {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--ig-space-sm);
  border-radius: var(--ig-radius-sm);
  background: white;
  padding: 6px;
}

.qr-card__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ig-text);
  margin-bottom: 0.25rem;
}

.qr-card__desc {
  font-size: 0.75rem;
  color: var(--ig-text-light);
  line-height: 1.4;
}

.modal__alt {
  text-align: center;
  padding-top: var(--ig-space-lg);
  border-top: 1px solid var(--ig-border-light);
}

.modal__alt-title {
  font-size: 0.8125rem;
  color: var(--ig-text-light);
  margin-bottom: var(--ig-space-sm);
}

.modal__alt-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ig-space-sm);
  justify-content: center;
}

.modal__alt-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  background: var(--ig-bg-alt);
  border: 1px solid var(--ig-border);
  border-radius: var(--ig-radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ig-text);
  transition: all var(--ig-transition);
}

.modal__alt-link:hover {
  background: var(--ig-gradient);
  color: white;
  border-color: transparent;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---------- Animations on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms ease-out, transform 600ms ease-out;
}

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

.reveal[data-delay="1"] { transition-delay: 80ms; }
.reveal[data-delay="2"] { transition-delay: 160ms; }
.reveal[data-delay="3"] { transition-delay: 240ms; }
.reveal[data-delay="4"] { transition-delay: 320ms; }
.reveal[data-delay="5"] { transition-delay: 400ms; }

/* ---------- Content typography ---------- */
.prose {
  max-width: 760px;
  margin: 0 auto;
}

.prose h2 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-top: var(--ig-space-2xl);
  margin-bottom: var(--ig-space-md);
  color: var(--ig-text);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: var(--ig-space-xl);
  margin-bottom: var(--ig-space-sm);
  color: var(--ig-text);
}

.prose p {
  font-size: 1rem;
  color: var(--ig-text-muted);
  line-height: 1.8;
  margin-bottom: var(--ig-space-md);
}

.prose ul, .prose ol {
  margin-bottom: var(--ig-space-md);
  padding-left: 1.5rem;
}

.prose ul li, .prose ol li {
  position: relative;
  padding-left: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--ig-text-muted);
  line-height: 1.7;
}

.prose ul li::marker {
  color: var(--ig-blue);
}

.prose strong {
  color: var(--ig-text);
  font-weight: 700;
}

.prose code {
  font-family: var(--ig-font-mono);
  font-size: 0.875em;
  background: var(--ig-bg-alt);
  color: var(--ig-blue);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

/* ---------- Notice / callout ---------- */
.callout {
  display: flex;
  gap: var(--ig-space-md);
  padding: var(--ig-space-lg);
  background: var(--ig-gradient-soft);
  border: 1px solid rgba(74,95,232,0.15);
  border-left: 4px solid var(--ig-blue);
  border-radius: var(--ig-radius-md);
  margin: var(--ig-space-lg) 0;
}

.callout__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--ig-blue);
}

.callout__content {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--ig-text);
  line-height: 1.7;
}

.callout__content strong {
  color: var(--ig-blue-dark);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--ig-space-2xl);
  }

  .hero__visual {
    max-width: 480px;
    margin: 0 auto;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--ig-space-md);
    padding: var(--ig-space-lg);
  }

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

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--ig-space-xl);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --ig-header-h: 64px;
    --ig-space-4xl: 4rem;
    --ig-space-3xl: 3rem;
  }

  .nav, .header__actions .btn--ghost {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav.is-mobile-open {
    display: flex;
    position: absolute;
    top: var(--ig-header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--ig-surface);
    border-bottom: 1px solid var(--ig-border);
    padding: var(--ig-space-md);
    gap: 0;
    box-shadow: var(--ig-shadow-lg);
  }

  .nav.is-mobile-open .nav__link {
    width: 100%;
    padding: 0.75rem var(--ig-space-md);
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .feature-grid,
  .testimonials,
  .usecase-grid,
  .dl-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .usecase-card {
    flex-direction: column;
    gap: var(--ig-space-md);
  }

  .modal__qr-grid {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta-banner {
    padding: var(--ig-space-2xl) var(--ig-space-lg);
  }

  .section {
    padding-block: var(--ig-space-3xl);
  }
}

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

  .modal__alt-links {
    flex-direction: column;
  }

  .modal__alt-link {
    width: 100%;
    justify-content: center;
  }
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--ig-blue);
  outline-offset: 2px;
  border-radius: 4px;
}

.btn:focus-visible {
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}