/* ==========================================================================
   ARDM Promotional Website - Shared Stylesheet
   Brand palette derived from logo analysis (deep crimson red)
   Style: flat / modern / professional
   ========================================================================== */

:root {
  /* Brand colors */
  --c-brand:        #B02511;
  --c-brand-dark:   #8C1C0D;
  --c-brand-darker: #6B1409;
  --c-brand-light:  #E84A2D;
  --c-brand-soft:   #FFF5F2;
  --c-brand-tint:   #FBEAE6;
  --c-brand-border: #F3D6CE;

  /* Neutrals */
  --c-bg:        #FFFFFF;
  --c-bg-alt:    #FAFAFB;
  --c-bg-dark:   #1A1A1A;
  --c-bg-darker: #0E0E0E;
  --c-text:      #1F1F23;
  --c-text-2:    #4A4A52;
  --c-text-3:    #7A7A85;
  --c-border:    #E8E8EC;
  --c-border-2:  #F0F0F3;

  /* Functional */
  --c-success: #2E7D32;
  --c-warning: #ED6C02;
  --c-info:    #0288D1;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Radius */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 9999px;

  /* Shadow */
  --sh-sm: 0 1px 2px rgba(20, 5, 0, .05);
  --sh-md: 0 4px 12px rgba(20, 5, 0, .08);
  --sh-lg: 0 12px 32px rgba(20, 5, 0, .12);
  --sh-brand: 0 8px 24px rgba(176, 37, 17, .25);

  /* Layout */
  --container: 1200px;
  --header-h: 64px;

  /* Transitions */
  --t-fast: .15s ease;
  --t-base: .25s ease;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--c-brand); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-brand-dark); }
ul, ol { padding-left: 1.2em; }
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-text);
  letter-spacing: -.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }
p { margin: 0 0 var(--space-4); }
code, kbd, pre {
  font-family: var(--font-mono);
  font-size: .9em;
  background: var(--c-bg-alt);
  border-radius: var(--r-sm);
}
code { padding: 2px 6px; color: var(--c-brand-dark); }
pre {
  padding: var(--space-4);
  overflow-x: auto;
  border: 1px solid var(--c-border);
}
pre code { background: transparent; padding: 0; color: inherit; }

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.section { padding: var(--space-9) 0; }
.section--tight { padding: var(--space-8) 0; }
.section--alt { background: var(--c-bg-alt); }
.section--brand {
  background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-brand-dark) 100%);
  color: #fff;
}
.section--soft { background: var(--c-brand-soft); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.lead {
  font-size: 1.15rem;
  color: var(--c-text-2);
  line-height: 1.7;
}

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-brand);
  padding: var(--space-1) var(--space-3);
  background: var(--c-brand-tint);
  border-radius: var(--r-full);
  margin-bottom: var(--space-3);
}

.section-title {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-7);
}
.section-title h2 { margin-bottom: var(--space-3); }
.section-title p { color: var(--c-text-2); font-size: 1.08rem; margin: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--c-text);
}
.brand:hover { color: var(--c-text); }
.brand__logo {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.brand__name { letter-spacing: -.01em; }
.brand__name small {
  display: block;
  font-size: .68rem;
  font-weight: 500;
  color: var(--c-text-3);
  letter-spacing: .04em;
  margin-top: -2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.main-nav a {
  padding: var(--space-2) var(--space-3);
  font-size: .95rem;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  font-weight: 500;
}
.main-nav a:hover { color: var(--c-brand); background: var(--c-brand-soft); }
.main-nav a.is-active { color: var(--c-brand); }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--c-border);
  background: #fff;
  border-radius: var(--r-sm);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
}
.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--c-text);
  transition: var(--t-fast);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 22px;
  font-size: .95rem;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: all var(--t-fast);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.4;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--c-brand);
  color: #fff;
  box-shadow: var(--sh-brand);
}
.btn--primary:hover {
  background: var(--c-brand-dark);
  color: #fff;
  box-shadow: 0 12px 28px rgba(176, 37, 17, .35);
}
.btn--ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border);
}
.btn--ghost:hover {
  border-color: var(--c-brand);
  color: var(--c-brand);
  background: var(--c-brand-soft);
}
.btn--light {
  background: #fff;
  color: var(--c-brand);
}
.btn--light:hover { background: var(--c-brand-soft); color: var(--c-brand-dark); }
.btn--lg { padding: 14px 30px; font-size: 1rem; }
.btn--sm { padding: 6px 14px; font-size: .85rem; }
.btn--block { display: flex; width: 100%; }
.btn--on-brand {
  background: #fff;
  color: var(--c-brand);
}
.btn--on-brand:hover { background: var(--c-brand-soft); color: var(--c-brand-dark); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: var(--space-9) 0 var(--space-8);
  background:
    radial-gradient(circle at 90% 10%, rgba(255, 255, 255, .08), transparent 40%),
    linear-gradient(135deg, var(--c-brand) 0%, var(--c-brand-dark) 60%, var(--c-brand-darker) 100%);
  color: #fff;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -120px; right: -120px;
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(255,255,255,.10), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -200px; left: -100px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(255,255,255,.06), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .9);
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .18);
  padding: 6px 14px;
  border-radius: var(--r-full);
  margin-bottom: var(--space-4);
}
.hero__eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #6DD86D; box-shadow: 0 0 0 3px rgba(109, 216, 109, .3);
}
.hero h1 {
  color: #fff;
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  margin-bottom: var(--space-4);
}
.hero h1 .accent { color: #FFD2C7; }
.hero__lead {
  font-size: 1.18rem;
  color: rgba(255, 255, 255, .85);
  max-width: 560px;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-5); }
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, .15);
}
.hero__stat .num {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
}
.hero__stat .label {
  font-size: .85rem;
  color: rgba(255, 255, 255, .7);
}

.hero__media {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0, 0, 0, .35);
  border: 1px solid rgba(255, 255, 255, .12);
  background: #fff;
}
.hero__media img { width: 100%; height: auto; display: block; }
.hero__badge {
  position: absolute;
  top: var(--space-4); right: var(--space-4);
  background: rgba(0, 0, 0, .55);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  gap: 6px;
}
.hero__badge .dot {
  width: 6px; height: 6px;
  background: #6DD86D; border-radius: 50%;
}

/* ---------- Page hero (smaller, for subpages) ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--c-brand) 0%, var(--c-brand-dark) 100%);
  color: #fff;
  padding: var(--space-8) 0 var(--space-7);
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(255,255,255,.10), transparent 40%),
    radial-gradient(circle at 100% 100%, rgba(255,255,255,.06), transparent 40%);
  pointer-events: none;
}
.page-hero__inner { position: relative; z-index: 1; max-width: 760px; }
.page-hero h1 { color: #fff; margin-bottom: var(--space-3); }
.page-hero p { color: rgba(255, 255, 255, .9); font-size: 1.1rem; margin: 0; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: .85rem;
  color: rgba(255, 255, 255, .7);
  margin-bottom: var(--space-4);
}
.breadcrumb a { color: rgba(255, 255, 255, .85); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { opacity: .6; }

/* ---------- Feature grid ---------- */
.grid {
  display: grid;
  gap: var(--space-5);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--space-5);
  transition: all var(--t-base);
}
.card:hover {
  border-color: var(--c-brand-border);
  box-shadow: var(--sh-md);
  transform: translateY(-2px);
}
.card__icon {
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  background: var(--c-brand-tint);
  color: var(--c-brand);
  margin-bottom: var(--space-4);
  font-size: 1.4rem;
}
.card h3 { margin-bottom: var(--space-2); font-size: 1.1rem; }
.card p { margin: 0; color: var(--c-text-2); font-size: .95rem; line-height: 1.6; }

/* Icon SVG */
.icon { width: 24px; height: 24px; display: inline-block; vertical-align: middle; }

/* ---------- Feature row (alternating image/text) ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7);
  align-items: center;
  margin-bottom: var(--space-8);
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row--reverse .feature-row__media { order: 2; }
.feature-row__content h2 {
  font-size: 1.8rem;
  margin-bottom: var(--space-3);
}
.feature-row__content .lead { margin-bottom: var(--space-4); }
.feature-row__list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
}
.feature-row__list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: .98rem;
  color: var(--c-text-2);
}
.feature-row__list li::before {
  content: "✓";
  flex-shrink: 0;
  width: 22px; height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-brand-tint);
  color: var(--c-brand);
  border-radius: 50%;
  font-size: .75rem;
  font-weight: 700;
  margin-top: 2px;
}
.feature-row__media {
  background: var(--c-brand-soft);
  border-radius: var(--r-lg);
  padding: var(--space-5);
  border: 1px solid var(--c-brand-border);
}
.feature-row__media img { width: 100%; border-radius: var(--r-md); }

/* Code/console mock */
.console {
  background: #1E1E24;
  color: #E0E0E5;
  border-radius: var(--r-md);
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: .88rem;
  line-height: 1.7;
  overflow-x: auto;
}
.console__head {
  display: flex;
  gap: 6px;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.console__dot { width: 11px; height: 11px; border-radius: 50%; }
.console__dot--r { background: #FF5F57; }
.console__dot--y { background: #FEBC2E; }
.console__dot--g { background: #28C840; }
.console__line { white-space: pre; }
.console__prompt { color: #6DD86D; }
.console__key { color: #FFB36B; }
.console__val { color: #6CB6FF; }
.console__cmt { color: #888; }

/* ---------- Use cases ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.usecase {
  background: #fff;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  transition: all var(--t-base);
}
.usecase:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
  border-color: var(--c-brand-border);
}
.usecase__banner {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  color: #fff;
  position: relative;
}
.usecase__banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(255,255,255,.15), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(0,0,0,.10), transparent 50%);
}
.usecase--dev   .usecase__banner { background: linear-gradient(135deg, #B02511, #8C1C0D); }
.usecase--ops   .usecase__banner { background: linear-gradient(135deg, #C73015, #9C1A0A); }
.usecase--data  .usecase__banner { background: linear-gradient(135deg, #D03820, #A0240F); }
.usecase--edu   .usecase__banner { background: linear-gradient(135deg, #A0240F, #6B1409); }
.usecase--ent   .usecase__banner { background: linear-gradient(135deg, #B02511, #6B1409); }
.usecase--cloud .usecase__banner { background: linear-gradient(135deg, #C42E18, #7C1A0C); }
.usecase__body { padding: var(--space-5); }
.usecase__body h3 { margin-bottom: var(--space-2); font-size: 1.15rem; }
.usecase__body p { color: var(--c-text-2); margin-bottom: var(--space-3); font-size: .95rem; }
.usecase__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: .72rem;
  padding: 3px 10px;
  background: var(--c-brand-tint);
  color: var(--c-brand-dark);
  border-radius: var(--r-full);
  font-weight: 500;
}

/* ---------- Testimonials ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.testimonial {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--space-6);
  position: relative;
  transition: all var(--t-base);
}
.testimonial:hover { box-shadow: var(--sh-md); border-color: var(--c-brand-border); }
.testimonial::before {
  content: "\201C";
  position: absolute;
  top: -10px; left: var(--space-5);
  font-size: 4rem;
  font-family: Georgia, serif;
  color: var(--c-brand);
  line-height: 1;
  opacity: .25;
}
.testimonial__stars {
  color: #F5A623;
  font-size: .9rem;
  letter-spacing: 2px;
  margin-bottom: var(--space-3);
}
.testimonial__text {
  font-size: .98rem;
  color: var(--c-text);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  font-style: italic;
}
.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.testimonial__avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-dark));
  flex-shrink: 0;
}
.testimonial__name { font-weight: 600; font-size: .95rem; }
.testimonial__role { font-size: .82rem; color: var(--c-text-3); }

/* ---------- Download popup (modal) ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 5, 0, .55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-5);
  opacity: 0;
  transition: opacity var(--t-base);
}
.modal-overlay.is-open { display: flex; opacity: 1;   left: 0;
  right: 0;
  top: 0;
  bottom: 0;}
button { outline: none }
.modal {
  background: #fff;
  border-radius: var(--r-lg);
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 80px rgba(0, 0, 0, .3);
  transform: translateY(20px) scale(.98);
  transition: transform var(--t-base);
}
.modal-overlay.is-open .modal { transform: translateY(0) scale(1); }
.modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--c-border);
}
.modal__head h3 {
  margin: 0;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.modal__close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--c-text-3);
  padding: 4px 8px;
  border-radius: var(--r-sm);
  transition: var(--t-fast);
}
.modal__close:hover { background: var(--c-bg-alt); color: var(--c-text); }
.modal__body { padding: var(--space-6); }

.dl-platforms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.dl-platform {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-4);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition: var(--t-fast);
  text-decoration: none;
  color: var(--c-text);
  background: #fff;
}
.dl-platform:hover {
  border-color: var(--c-brand);
  background: var(--c-brand-soft);
  transform: translateY(-2px);
  color: var(--c-text);
}
.dl-platform__icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
  line-height: 1;
}
.dl-platform__name { font-weight: 600; font-size: .95rem; }
.dl-platform__hint { font-size: .75rem; color: var(--c-text-3); margin-top: 4px; }

.dl-qr-section {
  background: linear-gradient(135deg, var(--c-brand-soft), #fff);
  border: 1px solid var(--c-brand-border);
  border-radius: var(--r-md);
  padding: var(--space-5);
}
.dl-qr-section h4 {
  text-align: center;
  margin-bottom: var(--space-2);
  font-size: 1.05rem;
}
.dl-qr-section p {
  text-align: center;
  color: var(--c-text-2);
  font-size: .88rem;
  margin-bottom: var(--space-5);
}
.dl-qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  max-width: 520px;
  margin: 0 auto;
}
.dl-qr-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: #fff;
  border-radius: var(--r-md);
  padding: var(--space-4);
  border: 1px solid var(--c-border);
}
.dl-qr-item img {
  width: 170px;
  height: 170px;
  border-radius: var(--r-sm);
  margin-bottom: var(--space-3);
}
.dl-qr-item__title {
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: 2px;
}
.dl-qr-item__hint {
  font-size: .78rem;
  color: var(--c-text-3);
}

.modal__foot {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--c-border);
  background: var(--c-bg-alt);
  border-radius: 0 0 var(--r-lg) var(--r-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .85rem;
  color: var(--c-text-3);
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- Download center (page) ---------- */
.platform-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.platform-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--t-base);
  position: relative;
  overflow: hidden;
}
.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
  border-color: var(--c-brand);
}
.platform-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--c-brand), var(--c-brand-light));
}
.platform-card__icon {
  font-size: 3rem;
  margin-bottom: var(--space-3);
  line-height: 1;
}
.platform-card h3 { font-size: 1.3rem; margin-bottom: var(--space-2); }
.platform-card__version {
  font-size: .85rem;
  color: var(--c-text-3);
  margin-bottom: var(--space-4);
}
.platform-card__features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-5);
  text-align: left;
}
.platform-card__features li {
  font-size: .9rem;
  color: var(--c-text-2);
  padding: 6px 0;
  border-bottom: 1px solid var(--c-border-2);
  display: flex;
  justify-content: space-between;
}
.platform-card__features li:last-child { border-bottom: none; }
.platform-card__features .v { color: var(--c-text); font-weight: 500; }

/* ---------- Docs layout ---------- */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-7);
  align-items: start;
}
.docs-nav {
  position: sticky;
  top: calc(var(--header-h) + var(--space-5));
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: var(--space-4);
}
.docs-nav h4 {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--c-text-3);
  margin: var(--space-4) 0 var(--space-2);
}
.docs-nav h4:first-child { margin-top: 0; }
.docs-nav ul { list-style: none; padding: 0; margin: 0; }
.docs-nav li a {
  display: block;
  padding: 6px 10px;
  font-size: .9rem;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
}
.docs-nav li a:hover { background: var(--c-brand-soft); color: var(--c-brand); }
.docs-nav li a.is-active {
  color: var(--c-brand);
  background: var(--c-brand-tint);
  border-left-color: var(--c-brand);
  font-weight: 600;
}
.docs-content { min-width: 0; }
.docs-content h2 { margin-top: var(--space-6); padding-top: var(--space-4); border-top: 1px solid var(--c-border-2); }
.docs-content h2:first-child { border-top: none; margin-top: 0; padding-top: 0; }
.docs-content h3 { margin-top: var(--space-5); }

.callout {
  background: var(--c-brand-soft);
  border-left: 3px solid var(--c-brand);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--r-sm);
  margin: var(--space-4) 0;
}
.callout--info {
  background: #E8F4FD;
  border-left-color: var(--c-info);
}
.callout__title {
  font-weight: 700;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: var(--t-fast);
}
.faq-item[open] { border-color: var(--c-brand-border); box-shadow: var(--sh-sm); }
.faq-item summary {
  padding: var(--space-4) var(--space-5);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--c-brand);
  transition: transform var(--t-fast);
  flex-shrink: 0;
  width: 24px;
  text-align: center;
  line-height: 1;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item__answer {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--c-text-2);
  line-height: 1.7;
}
.faq-item__answer p:last-child { margin-bottom: 0; }

/* ---------- Stats / counters ---------- */
.stats-band {
  background: linear-gradient(135deg, var(--c-brand-darker), var(--c-brand-dark));
  color: #fff;
  padding: var(--space-7) 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  text-align: center;
}
.stat__num {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
}
.stat__label {
  font-size: .92rem;
  color: rgba(255, 255, 255, .75);
  margin-top: var(--space-2);
}

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-dark));
  color: #fff;
  padding: var(--space-8) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before, .cta-band::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.cta-band::before {
  top: -100px; left: -80px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(255,255,255,.12), transparent 70%);
}
.cta-band::after {
  bottom: -120px; right: -80px;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(255,255,255,.08), transparent 70%);
}
.cta-band__inner { position: relative; z-index: 1; }
.cta-band h2 { color: #fff; margin-bottom: var(--space-3); }
.cta-band p { color: rgba(255, 255, 255, .9); font-size: 1.1rem; max-width: 600px; margin: 0 auto var(--space-5); }

/* ---------- About page ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-7);
  align-items: start;
}
.timeline { position: relative; padding-left: var(--space-5); }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--c-brand-border);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-5);
}
.timeline__item::before {
  content: "";
  position: absolute;
  left: -28px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c-brand);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--c-brand);
}
.timeline__date {
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-brand);
  margin-bottom: 4px;
}
.timeline__title { font-weight: 600; margin-bottom: 4px; }
.timeline__desc { color: var(--c-text-2); font-size: .92rem; margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--c-bg-darker);
  color: rgba(255, 255, 255, .7);
  padding: var(--space-8) 0 var(--space-5);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.2fr;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
}
.footer-brand img { width: 32px; height: 32px; }
.footer-desc { font-size: .9rem; line-height: 1.7; max-width: 320px; }
.footer-col h5 {
  color: #fff;
  font-size: .92rem;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--space-2); }
.footer-col a {
  color: rgba(255, 255, 255, .65);
  font-size: .9rem;
}
.footer-col a:hover { color: #fff; }
.footer-social { display: flex; gap: var(--space-2); margin-top: var(--space-3); }
.footer-social a {
  width: 36px; height: 36px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, .8);
}
.footer-social a:hover { background: var(--c-brand); border-color: var(--c-brand); color: #fff; }
.footer-social svg { width: 18px; height: 18px; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: .85rem;
}
.footer-bottom a { color: rgba(255, 255, 255, .65); }
.footer-bottom a:hover { color: #fff; }
.footer-bottom__links { display: flex; gap: var(--space-4); flex-wrap: wrap; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  width: 44px;
  height: 44px;
  background: var(--c-brand);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--sh-brand);
  opacity: 0;
  pointer-events: none;
  transition: all var(--t-base);
  z-index: 50;
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { background: var(--c-brand-dark); transform: translateY(-2px); }

/* ---------- Utility ---------- */
.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;
}
.text-brand { color: var(--c-brand); }
.bg-soft { background: var(--c-brand-soft); }
.rounded { border-radius: var(--r-md); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__media { max-width: 600px; margin: 0 auto; }
  .feature-row { grid-template-columns: 1fr; }
  .feature-row--reverse .feature-row__media { order: 0; }
  .docs-layout { grid-template-columns: 1fr; }
  .docs-nav { position: static; }
  .usecase-grid,
  .testimonial-grid,
  .platform-cards { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .section { padding: var(--space-7) 0; }
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
    gap: 0;
    transform: translateY(-150%);
    transition: transform var(--t-base);
    box-shadow: var(--sh-md);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .main-nav.is-open { transform: translateY(0); }
  .main-nav a { padding: var(--space-3); border-radius: var(--r-sm); }
  .main-nav .btn { margin-top: var(--space-2); }
  .nav-toggle { display: flex; }
  .header-actions .btn--ghost { display: none; }

  .usecase-grid,
  .testimonial-grid,
  .platform-cards,
  .grid--2,
  .grid--3,
  .dl-platforms { grid-template-columns: 1fr; }
  .dl-qr-grid { grid-template-columns: 1fr; }
  .hero__stats { gap: var(--space-4); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .modal { max-width: 100%; }
  .modal__head, .modal__body, .modal__foot { padding-left: var(--space-4); padding-right: var(--space-4); }
}

@media (max-width: 480px) {
  .hero__cta .btn { flex: 1 1 100%; }
  .stats-grid { grid-template-columns: 1fr; }
  .platform-card { padding: var(--space-5); }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .back-to-top, .modal-overlay, .nav-toggle { display: none !important; }
  body { color: #000; }
  a { color: #000; text-decoration: underline; }
}