/* =========================================================
   Simply AI App — Production styles
   Premium dark technology design system
   ========================================================= */

:root {
  /* Colors */
  --color-bg: #070b14;
  --color-bg-elevated: #0d1424;
  --color-surface: #121a2e;
  --color-surface-hover: #182238;
  --color-border: rgba(148, 163, 184, 0.14);
  --color-border-strong: rgba(148, 163, 184, 0.28);
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-primary: #8b5cf6;
  --color-primary-hover: #a78bfa;
  --color-primary-deep: #6d28d9;
  --color-secondary: #22d3ee;
  --color-secondary-deep: #0891b2;
  --color-accent-indigo: #6366f1;
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-danger: #f87171;
  --color-focus: #67e8f9;
  --gradient-brand: linear-gradient(135deg, #8b5cf6 0%, #6366f1 45%, #22d3ee 100%);
  --gradient-surface: linear-gradient(180deg, rgba(139, 92, 246, 0.08) 0%, rgba(7, 11, 20, 0) 100%);
  --gradient-hero: radial-gradient(ellipse 80% 60% at 70% 20%, rgba(99, 102, 241, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(34, 211, 238, 0.12), transparent 50%),
    radial-gradient(ellipse 40% 40% at 90% 70%, rgba(139, 92, 246, 0.1), transparent 45%);
  --glow-primary: 0 0 40px rgba(139, 92, 246, 0.25);
  --glow-secondary: 0 0 30px rgba(34, 211, 238, 0.18);

  /* Typography — system stack only, no remote fonts */
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.7vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.25rem + 1.2vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.4rem + 2vw, 2.75rem);
  --text-4xl: clamp(2.25rem, 1.6rem + 2.8vw, 3.5rem);
  --leading-tight: 1.15;
  --leading-snug: 1.35;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;
  --tracking-tight: -0.02em;
  --tracking-wide: 0.06em;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container: 72rem;
  --container-narrow: 42rem;
  --header-height: 4.25rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.45);
  --shadow-card: 0 0 0 1px var(--color-border), 0 12px 32px rgba(0, 0, 0, 0.35);

  /* Motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  color-scheme: dark;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  background-image: var(--gradient-hero);
  background-attachment: scroll;
  overflow-x: hidden;
}

@media (min-width: 900px) {
  body {
    background-attachment: fixed;
  }
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: var(--color-secondary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color var(--duration-fast) var(--ease-out);
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--space-4);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  font-weight: 700;
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-xl);
}

p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
}

ul,
ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.25rem;
  color: var(--color-text-secondary);
}

li + li {
  margin-top: var(--space-2);
}

/* ---------- Utilities ---------- */
.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.container-narrow {
  width: min(100% - 2rem, var(--container-narrow));
  margin-inline: auto;
}

.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;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-4);
}

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

.text-link {
  color: var(--color-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
}

.section {
  padding: var(--space-16) 0;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, rgba(18, 26, 46, 0.55), rgba(7, 11, 20, 0.2));
  border-block: 1px solid var(--color-border);
}

.section-header {
  max-width: 40rem;
  margin-bottom: var(--space-10);
}

.section-header.centered {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-secondary);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.22);
  border-radius: var(--radius-full);
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Content stays visible by default. Reveal hiding is enabled only after main.js
   successfully initializes the observer (html.reveal-enabled). */
[data-reveal] {
  opacity: 1;
  transform: none;
}

html.reveal-enabled [data-reveal]:not(.is-revealed) {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

html.reveal-enabled [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html.reveal-enabled [data-reveal]:not(.is-revealed),
  html.reveal-enabled [data-reveal].is-revealed,
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 2.75rem;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary-deep), var(--color-primary) 55%, var(--color-accent-indigo));
  box-shadow: var(--glow-primary), var(--shadow-sm);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 0 48px rgba(139, 92, 246, 0.35), var(--shadow-md);
}

.btn-secondary {
  color: var(--color-text);
  background: rgba(148, 163, 184, 0.06);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
  border-color: rgba(167, 139, 250, 0.45);
}

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

.btn-ghost:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn-sm {
  min-height: 2.375rem;
  padding: 0.5rem 0.9rem;
  font-size: var(--text-xs);
}

.btn.is-disabled,
.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.28rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.2;
  border: 1px solid transparent;
}

.badge-category {
  color: var(--color-primary-hover);
  background: rgba(139, 92, 246, 0.12);
  border-color: rgba(139, 92, 246, 0.28);
}

.badge-available {
  color: var(--color-success);
  background: rgba(52, 211, 153, 0.1);
  border-color: rgba(52, 211, 153, 0.28);
}

.badge-soon {
  color: var(--color-warning);
  background: rgba(251, 191, 36, 0.1);
  border-color: rgba(251, 191, 36, 0.28);
}

.badge-dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: currentColor;
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background: rgba(148, 163, 184, 0.08);
  border: 1px solid var(--color-border);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  background: rgba(7, 11, 20, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: border-color var(--duration-normal) var(--ease-out),
    background var(--duration-normal) var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(7, 11, 20, 0.9);
}

.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.brand:hover {
  color: var(--color-text);
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.brand-wordmark {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle-icon {
  display: block;
  width: 1.15rem;
  height: 2px;
  background: currentColor;
  position: relative;
  border-radius: 2px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav {
  display: none;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
}

.nav-list a:hover,
.nav-list a.is-active {
  color: var(--color-text);
  background: rgba(148, 163, 184, 0.08);
}

.header-cta {
  display: none;
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
  }

  .header-cta {
    display: inline-flex;
  }
}

/* Mobile nav panel */
.mobile-nav {
  position: fixed;
  inset: var(--header-height) 0 0 0;
  z-index: 99;
  padding: var(--space-6) var(--space-4) var(--space-8);
  background: rgba(7, 11, 20, 0.97);
  border-top: 1px solid var(--color-border);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal);
  overflow-y: auto;
}

.mobile-nav.is-open {
  transform: none;
  visibility: visible;
}

.mobile-nav .nav-list {
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
}

.mobile-nav .nav-list a {
  min-height: 3rem;
  padding: 0.75rem 1rem;
  font-size: var(--text-base);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.mobile-nav-cta {
  margin-top: var(--space-6);
}

@media (min-width: 900px) {
  .mobile-nav {
    display: none;
  }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-12) 0 var(--space-16);
  position: relative;
}

.hero-grid {
  display: grid;
  gap: var(--space-10);
  align-items: center;
}

@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--space-12);
  }
}

.hero-copy h1 {
  margin-bottom: var(--space-5);
}

.hero-lead {
  font-size: var(--text-lg);
  max-width: 36rem;
  margin-bottom: var(--space-8);
}

.hero-visual {
  position: relative;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-card), var(--glow-primary);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.hero-visual img,
.hero-visual svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-hero {
  padding: var(--space-12) 0 var(--space-10);
  border-bottom: 1px solid var(--color-border);
  background: var(--gradient-surface);
}

.page-hero h1 {
  margin-bottom: var(--space-4);
}

.page-hero p {
  max-width: 40rem;
  font-size: var(--text-lg);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  list-style: none;
  padding: 0;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.breadcrumb li + li::before {
  content: '/';
  margin-right: var(--space-2);
  color: var(--color-text-muted);
}

/* ---------- Cards / grids ---------- */
.category-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1100px) {
  .category-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.category-card {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out);
}

.category-card:hover {
  border-color: rgba(139, 92, 246, 0.4);
  transform: translateY(-2px);
  background: var(--color-surface-hover);
}

.category-icon {
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  background: rgba(139, 92, 246, 0.12);
  color: var(--color-primary-hover);
}

.category-card h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.category-card p {
  font-size: var(--text-sm);
  margin: 0;
}

.category-note {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.featured-panel {
  display: grid;
  gap: var(--space-8);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background:
    linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(34, 211, 238, 0.05)),
    var(--color-surface);
  box-shadow: var(--shadow-card);
}

@media (min-width: 800px) {
  .featured-panel {
    grid-template-columns: auto 1fr;
    padding: var(--space-8);
    align-items: center;
  }
}

.featured-icon {
  width: 5.5rem;
  height: 5.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  padding: var(--space-3);
}

.featured-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.product-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.product-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
}

.product-card-icon img {
  width: 4rem;
  height: 4rem;
}

.product-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.product-card-title {
  font-size: var(--text-lg);
  margin: 0;
}

.product-card-desc {
  margin: 0;
  font-size: var(--text-sm);
  flex-grow: 1;
}

.product-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.product-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  margin-top: var(--space-2);
}

.coming-soon-panel {
  margin-top: var(--space-8);
  padding: var(--space-8);
  text-align: center;
  border-radius: var(--radius-xl);
  border: 1px dashed var(--color-border-strong);
  background: rgba(18, 26, 46, 0.5);
}

.coming-soon-panel h3 {
  margin-bottom: var(--space-3);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-btn {
  min-height: 2.5rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-secondary);
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
}

.filter-btn.is-active,
.filter-btn[aria-pressed='true'] {
  color: var(--color-text);
  background: rgba(139, 92, 246, 0.16);
  border-color: rgba(139, 92, 246, 0.4);
}

/* ---------- Feature / why / about ---------- */
.feature-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 700px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-item {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.feature-item h3 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.feature-item p {
  margin: 0;
  font-size: var(--text-sm);
}

.feature-icon {
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: var(--space-4);
  color: var(--color-secondary);
}

.split-grid {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 900px) {
  .split-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0;
}

.steps li {
  position: relative;
  padding: var(--space-4) var(--space-4) var(--space-4) 3.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  margin-top: var(--space-3);
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: var(--text-xs);
  font-weight: 700;
  color: #fff;
  background: var(--gradient-brand);
}

/* ---------- FAQ ---------- */
.faq-list {
  display: grid;
  gap: var(--space-3);
  max-width: 48rem;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 3.25rem;
  padding: var(--space-4) var(--space-5);
  border: 0;
  background: transparent;
  color: var(--color-text);
  font: inherit;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq-icon {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background: var(--color-text-secondary);
  border-radius: 2px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.faq-icon::before {
  width: 100%;
  height: 2px;
  top: 50%;
  left: 0;
  margin-top: -1px;
}

.faq-icon::after {
  width: 2px;
  height: 100%;
  left: 50%;
  top: 0;
  margin-left: -1px;
}

.faq-question[aria-expanded='true'] .faq-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.faq-answer {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ---------- CTA band ---------- */
.cta-band {
  padding: var(--space-12) 0;
}

.cta-panel {
  padding: var(--space-10) var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(139, 92, 246, 0.35);
  background:
    radial-gradient(ellipse at top right, rgba(34, 211, 238, 0.12), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(139, 92, 246, 0.18), transparent 55%),
    var(--color-surface);
  text-align: center;
  box-shadow: var(--glow-primary);
}

.cta-panel h2 {
  margin-bottom: var(--space-4);
}

.cta-panel p {
  max-width: 34rem;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.cta-panel .btn-row {
  justify-content: center;
}

/* ---------- Legal / content pages ---------- */
.prose {
  max-width: var(--container-narrow);
}

.prose h2 {
  margin-top: var(--space-10);
  font-size: var(--text-xl);
}

.prose h3 {
  margin-top: var(--space-8);
  font-size: var(--text-lg);
}

.prose p,
.prose li {
  font-size: var(--text-base);
}

.legal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.notice {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(251, 191, 36, 0.3);
  background: rgba(251, 191, 36, 0.08);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-8);
}

.review-block {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.review-block h3 {
  margin-bottom: var(--space-3);
  font-size: var(--text-base);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.contact-card {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.contact-email {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  word-break: break-word;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-elevated);
  color: var(--color-text);
  font: inherit;
}

.form-group textarea {
  min-height: 8rem;
  resize: vertical;
}

.form-hint {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.form-error {
  color: var(--color-danger);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-4) 0;
}

.chip {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.social-links[hidden] {
  display: none !important;
}

.social-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.social-list a {
  display: inline-flex;
  min-height: 2.5rem;
  align-items: center;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
}

.social-list a:hover {
  color: var(--color-text);
}

.mt-12 {
  margin-top: var(--space-12);
}

.btn-row-centered {
  justify-content: center;
}

.error-logo {
  margin: 0 auto var(--space-6);
}

.inquiry-heading {
  margin-top: var(--space-8);
  font-size: var(--text-base);
}

.products-cta-spacing {
  margin-top: var(--space-12);
}

.screenshot-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .screenshot-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.screenshot-card {
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  overflow: hidden;
}

.screenshot-card img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-card figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.privacy-local-note {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(34, 211, 238, 0.28);
  background: rgba(34, 211, 238, 0.06);
}

.version-note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ---------- Product detail ---------- */
.product-hero-panel {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  margin-bottom: var(--space-10);
}

@media (min-width: 700px) {
  .product-hero-panel {
    grid-template-columns: auto 1fr;
    padding: var(--space-8);
    align-items: center;
  }
}

.product-hero-icon {
  width: 6rem;
  height: 6rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  padding: var(--space-3);
}

.placeholder-box {
  padding: var(--space-5);
  border-radius: var(--radius-md);
  border: 1px dashed rgba(139, 92, 246, 0.4);
  background: rgba(139, 92, 246, 0.06);
}

.placeholder-box h3,
.placeholder-box h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.placeholder-box p {
  margin: 0;
  font-size: var(--text-sm);
}

.preview-frame {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background: var(--color-bg-elevated);
}

/* ---------- 404 ---------- */
.error-page {
  min-height: calc(100vh - var(--header-height) - 12rem);
  display: grid;
  place-items: center;
  padding: var(--space-16) 0;
  text-align: center;
}

.error-code {
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  line-height: 1;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: var(--space-4);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: var(--space-8);
  padding: var(--space-16) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
  background: #050810;
}

.footer-grid {
  display: grid;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

@media (min-width: 700px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.footer-brand p {
  font-size: var(--text-sm);
  max-width: 22rem;
}

.footer-brand .brand {
  margin-bottom: var(--space-4);
}

.footer-col h2 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  display: inline-flex;
  min-height: 2.25rem;
  align-items: center;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: grid;
  gap: var(--space-3);
}

.footer-bottom p {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.disclaimer {
  max-width: 56rem;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: 80;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--duration-normal), visibility var(--duration-normal),
    transform var(--duration-normal);
  box-shadow: var(--shadow-md);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top svg {
  width: 1.1rem;
  height: 1.1rem;
  margin: auto;
}

/* ---------- Misc ---------- */
.icon-inline {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
}

.main-content {
  outline: none;
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-4);
}

@media (max-width: 359px) {
  .container {
    width: min(100% - 1.25rem, var(--container));
  }

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

  .btn {
    width: 100%;
  }
}