/* ============================================================
   AirQuiz Landing Page — styles.css  (v2.0)
   ============================================================ */

/* ── 1. Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

/* ── 2. Variables ─────────────────────────────────────────── */
:root {
  --primary:         #4F46E5;
  --primary-dark:    #3730A3;
  --primary-light:   #EEF2FF;
  --secondary:       #7C3AED;
  --accent:          #F59E0B;
  --success:         #10B981;
  --error:           #EF4444;

  --color-bg:        #ffffff;
  --color-bg-alt:    #F8FAFC;
  --color-bg-dark:   #0D1117;
  --color-text:      #1E293B;
  --color-muted:     #64748B;
  --color-light:     #94A3B8;
  --color-border:    #E2E8F0;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.12);
  --shadow-xl:  0 24px 64px rgba(0,0,0,.15);
  --glow:       0 0 32px rgba(79,70,229,.35);

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  --ease: cubic-bezier(.4,0,.2,1);
  --t:    0.25s;
  --t-slow: 0.5s;

  --max-w: 1200px;
  --section-pad: 96px 24px;
}

/* ── 3. Utils ─────────────────────────────────────────────── */
.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }

.section-label {
  display: inline-block;
  font-size: .75rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--primary); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800; line-height: 1.2; color: var(--color-text); margin-bottom: 16px;
}
.section-title--dark { color: #ffffff; }
.section-subtitle {
  font-size: 1.0625rem; color: var(--color-muted); max-width: 560px; line-height: 1.7;
}
.section-subtitle--dark { color: rgba(255,255,255,.65); }

.highlight {
  color: var(--primary); position: relative; display: inline-block;
}
.highlight::after {
  content: ''; position: absolute; bottom: 2px; left: 0; right: 0;
  height: 4px; background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px; opacity: .3;
}
.highlight-grad {
  background: linear-gradient(135deg, #a78bfa 0%, #60a5fa 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ── 4. Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius-full);
  font-size: .9375rem; font-weight: 600;
  transition: all var(--t) var(--ease); white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 20px rgba(79,70,229,.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(79,70,229,.5); }

.btn-outline-purple {
  border: 2px solid var(--secondary); color: var(--secondary); background: transparent;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: var(--radius-full);
  font-size: .9375rem; font-weight: 600;
  transition: all var(--t) var(--ease);
}
.btn-outline-purple:hover {
  background: rgba(124,58,237,.08); transform: translateY(-2px);
}

.btn-labs {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, #a78bfa, #60a5fa);
  color: #fff; font-size: 1rem; font-weight: 700;
  box-shadow: 0 6px 28px rgba(167,139,250,.45);
  transition: all var(--t) var(--ease);
}
.btn-labs:hover { transform: translateY(-2px); box-shadow: 0 10px 36px rgba(167,139,250,.55); }

.btn-sm { padding: 10px 20px; font-size: .875rem; }

/* ── 5. Navbar ────────────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--t);
}
.navbar.scrolled { box-shadow: var(--shadow-md); }

.navbar__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.navbar__logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.375rem; font-weight: 800; color: var(--primary); letter-spacing: -.03em;
}
.navbar__logo-icon { width: 36px; height: 36px; flex-shrink: 0; }

.navbar__links { display: flex; align-items: center; gap: 4px; }

.navbar__link {
  padding: 8px 14px; border-radius: var(--radius-full);
  font-size: .875rem; font-weight: 500; color: var(--color-muted);
  transition: color var(--t), background var(--t);
}
.navbar__link:hover { color: var(--primary); background: var(--primary-light); }

.navbar__link--labs { color: var(--secondary); font-weight: 600; }
.navbar__link--labs:hover { background: rgba(124,58,237,.08); color: var(--secondary); }

.navbar__new-tag {
  display: inline-block; padding: 1px 7px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff; font-size: .6rem; font-weight: 800; letter-spacing: .04em;
  vertical-align: middle; margin-left: 4px; text-transform: uppercase;
}

.navbar__cta {
  padding: 9px 22px; border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff; font-size: .875rem; font-weight: 600;
  transition: all var(--t); box-shadow: 0 3px 12px rgba(79,70,229,.3);
}
.navbar__cta:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(79,70,229,.4); }

.navbar__hamburger { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.navbar__hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--color-text); border-radius: 2px; transition: all var(--t);
}
.navbar__hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__hamburger.open span:nth-child(2) { opacity: 0; }
.navbar__hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.navbar__mobile {
  display: none; flex-direction: column;
  padding: 12px 24px 20px; border-top: 1px solid var(--color-border);
  background: #fff; gap: 4px;
}
.navbar__mobile.open { display: flex; }
.navbar__mobile .navbar__link { display: block; padding: 12px 16px; font-size: 1rem; }
.navbar__mobile .navbar__cta { margin-top: 8px; text-align: center; display: block; padding: 13px 22px; }

/* ── 6. Hero ──────────────────────────────────────────────── */
.hero {
  padding: 148px 24px 80px;
  background: linear-gradient(145deg, #f0effe 0%, #ffffff 45%, #f8f4ff 100%);
  overflow: hidden; position: relative;
}

.hero__blob {
  position: absolute; border-radius: 50%;
  pointer-events: none; filter: blur(80px);
}
.hero__blob--1 {
  width: 600px; height: 600px;
  top: -200px; right: -100px;
  background: radial-gradient(circle, rgba(79,70,229,.15) 0%, transparent 65%);
  animation: blobFloat 8s ease-in-out infinite;
}
.hero__blob--2 {
  width: 400px; height: 400px;
  bottom: -120px; left: -80px;
  background: radial-gradient(circle, rgba(124,58,237,.12) 0%, transparent 65%);
  animation: blobFloat 10s ease-in-out infinite reverse;
}
.hero__blob--3 {
  width: 300px; height: 300px;
  top: 40%; left: 40%;
  background: radial-gradient(circle, rgba(245,158,11,.08) 0%, transparent 65%);
  animation: blobFloat 12s ease-in-out infinite 2s;
}
@keyframes blobFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-30px) scale(1.05); }
}

.hero__inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 56px; align-items: center;
}

.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; background: var(--primary-light);
  color: var(--primary); border-radius: var(--radius-full);
  font-size: .8125rem; font-weight: 600; margin-bottom: 20px;
}
.hero__badge-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--primary); animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .5; transform: scale(.8); }
}

.hero__title {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 900; line-height: 1.1; color: var(--color-text);
  letter-spacing: -.03em; margin-bottom: 20px;
}
.hero__subtitle {
  font-size: 1.125rem; color: var(--color-muted);
  line-height: 1.7; margin-bottom: 36px; max-width: 480px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-bottom: 48px; }

.hero__stats { display: flex; gap: 32px; flex-wrap: wrap; }
.hero__stat { display: flex; flex-direction: column; }
.hero__stat-number {
  font-size: 1.5rem; font-weight: 800; color: var(--color-text); letter-spacing: -.03em;
}
.hero__stat-label { font-size: .8125rem; color: var(--color-muted); }

/* Hero phone + floating badges */
.hero__visual { display: flex; justify-content: center; align-items: center; position: relative; }
.hero__phone-wrap { position: relative; display: inline-block; }
.hero__svg-wrap {
  width: 100%; max-width: 440px;
  filter: drop-shadow(0 24px 60px rgba(79,70,229,.28));
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-14px); }
}

.hero__float {
  position: absolute;
  padding: 8px 14px; border-radius: var(--radius-full);
  background: #fff; font-size: .8125rem; font-weight: 700;
  color: var(--color-text); box-shadow: var(--shadow-lg);
  white-space: nowrap;
  animation: floatBadge 4s ease-in-out infinite;
}
.hero__float--a { top: 15%; right: -20px; animation-delay: 0s; color: var(--primary); }
.hero__float--b { top: 42%; left: -32px; animation-delay: 1.5s; color: var(--secondary); }
.hero__float--c { bottom: 20%; right: -24px; animation-delay: 3s; color: var(--success); }
@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

/* ── 7. Trust Bar ─────────────────────────────────────────── */
.trust-bar {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 20px 24px; overflow: hidden;
}
.trust-bar__inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
}
.trust-bar__label {
  font-size: .75rem; font-weight: 700; color: var(--color-light);
  text-transform: uppercase; letter-spacing: .1em; white-space: nowrap; flex-shrink: 0;
}
.trust-bar__scroll { overflow: hidden; flex: 1; }
.trust-bar__track {
  display: flex; gap: 20px; align-items: center;
  animation: marquee 30s linear infinite;
  width: max-content;
}
.trust-bar__item { font-size: .875rem; font-weight: 600; color: var(--color-muted); white-space: nowrap; }
.trust-bar__dot { color: var(--color-border); font-size: 1.2rem; }
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── 8. Features ──────────────────────────────────────────── */
.features { padding: var(--section-pad); background: var(--color-bg); }
.features__header { margin-bottom: 56px; }
.features__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}

.feature-card {
  padding: 32px 28px; border-radius: var(--radius-lg);
  background: var(--color-bg-alt); border: 1px solid var(--color-border);
  transition: all var(--t) var(--ease); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  opacity: 0; transition: opacity var(--t);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card:hover::before { opacity: 1; }

.feature-card[data-accent="indigo"]::before  { background: linear-gradient(90deg, var(--primary), var(--secondary)); }
.feature-card[data-accent="green"]::before   { background: linear-gradient(90deg, #10B981, #059669); }
.feature-card[data-accent="amber"]::before   { background: linear-gradient(90deg, #F59E0B, #D97706); }
.feature-card[data-accent="purple"]::before  { background: linear-gradient(90deg, var(--secondary), #9333EA); }
.feature-card[data-accent="rose"]::before    { background: linear-gradient(90deg, #F43F5E, #E11D48); }
.feature-card[data-accent="teal"]::before    { background: linear-gradient(90deg, #0D9488, #0F766E); }

.feature-card__icon-wrap {
  width: 56px; height: 56px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
  transition: transform var(--t) var(--ease);
}
.feature-card:hover .feature-card__icon-wrap { transform: scale(1.1) rotate(-3deg); }

.feature-card__icon-wrap--indigo { background: rgba(79,70,229,.12); }
.feature-card__icon-wrap--green  { background: rgba(16,185,129,.12); }
.feature-card__icon-wrap--amber  { background: rgba(245,158,11,.12); }
.feature-card__icon-wrap--purple { background: rgba(124,58,237,.12); }
.feature-card__icon-wrap--rose   { background: rgba(244,63,94,.12); }
.feature-card__icon-wrap--teal   { background: rgba(13,148,136,.12); }

.feature-card__title { font-size: 1.125rem; font-weight: 700; color: var(--color-text); margin-bottom: 8px; }
.feature-card__desc { font-size: .9375rem; color: var(--color-muted); line-height: 1.65; margin-bottom: 18px; }

.feature-card__list { display: flex; flex-direction: column; gap: 7px; }
.feature-card__list li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: .875rem; color: var(--color-muted);
}
.feature-card__list li::before {
  content: '✓'; font-size: .7rem; font-weight: 800;
  width: 18px; height: 18px; flex-shrink: 0; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-top: 1px;
}
.feature-card[data-accent="indigo"] .feature-card__list li::before { background: rgba(79,70,229,.15);  color: var(--primary); }
.feature-card[data-accent="green"]  .feature-card__list li::before { background: rgba(16,185,129,.15); color: var(--success); }
.feature-card[data-accent="amber"]  .feature-card__list li::before { background: rgba(245,158,11,.15); color: var(--accent); }
.feature-card[data-accent="purple"] .feature-card__list li::before { background: rgba(124,58,237,.15); color: var(--secondary); }
.feature-card[data-accent="rose"]   .feature-card__list li::before { background: rgba(244,63,94,.15);  color: #F43F5E; }
.feature-card[data-accent="teal"]   .feature-card__list li::before { background: rgba(13,148,136,.15); color: #0D9488; }

/* ── 9. Labs ──────────────────────────────────────────────── */
.labs {
  padding: var(--section-pad);
  background: linear-gradient(135deg, #0D0A1E 0%, #1A0D2E 40%, #0D1A2E 100%);
  position: relative; overflow: hidden;
}
.labs__container { position: relative; z-index: 1; }

.labs__glow {
  position: absolute; border-radius: 50%;
  pointer-events: none; filter: blur(100px);
}
.labs__glow--1 {
  width: 500px; height: 500px; top: -150px; left: -100px;
  background: radial-gradient(circle, rgba(124,58,237,.25) 0%, transparent 65%);
  animation: blobFloat 9s ease-in-out infinite;
}
.labs__glow--2 {
  width: 400px; height: 400px; bottom: -100px; right: -80px;
  background: radial-gradient(circle, rgba(96,165,250,.2) 0%, transparent 65%);
  animation: blobFloat 11s ease-in-out infinite 3s;
}

.labs__header { margin-bottom: 48px; }

.labs__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px; border-radius: var(--radius-full); margin-bottom: 16px;
  background: rgba(167,139,250,.2); border: 1px solid rgba(167,139,250,.35);
  color: #C4B5FD; font-size: .8125rem; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  animation: shimmerBadge 3s linear infinite;
}
@keyframes shimmerBadge {
  0%,100% { box-shadow: 0 0 0 0 rgba(167,139,250,0); }
  50%      { box-shadow: 0 0 0 8px rgba(167,139,250,0); }
}

.labs__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-bottom: 48px;
}

.labs__card {
  padding: 24px 22px; border-radius: var(--radius-lg);
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  transition: all var(--t) var(--ease); cursor: default;
  position: relative; overflow: hidden;
}
.labs__card::before {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(167,139,250,.06) 0%, rgba(96,165,250,.06) 100%);
  opacity: 0; transition: opacity var(--t);
}
.labs__card:hover, .labs__card--active {
  border-color: rgba(167,139,250,.35);
  background: rgba(255,255,255,.07);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(124,58,237,.25);
}
.labs__card:hover::before, .labs__card--active::before { opacity: 1; }

.labs__card__badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; height: 32px; padding: 0 12px;
  border-radius: var(--radius-md); font-size: .8125rem; font-weight: 800;
  background: var(--badge-bg); color: var(--badge-clr);
  margin-bottom: 12px; letter-spacing: .02em;
}
.labs__card__title {
  font-size: 1rem; font-weight: 700; color: rgba(255,255,255,.9); margin-bottom: 6px;
}
.labs__card__desc { font-size: .875rem; color: rgba(255,255,255,.45); line-height: 1.55; }

.labs__cta { text-align: center; }
.labs__cta-note { margin-top: 12px; font-size: .875rem; color: rgba(255,255,255,.35); }

/* ── 10. Platform ─────────────────────────────────────────── */
.platform { padding: var(--section-pad); background: var(--color-bg); }
.platform__header { margin-bottom: 56px; }

.platform__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}

.platform__card {
  padding: 36px 30px; border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  transition: all var(--t) var(--ease);
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}
.platform__card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.platform__card--featured {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 16px 48px rgba(79,70,229,.35);
}
.platform__card--featured:hover { box-shadow: 0 24px 60px rgba(79,70,229,.5); }

.platform__card__new {
  position: absolute; top: 20px; right: 20px;
  padding: 3px 10px; border-radius: var(--radius-full);
  background: rgba(255,255,255,.25); color: #fff;
  font-size: .7rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase;
}
.platform__card__icon { font-size: 2rem; }
.platform__card__label {
  font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--color-light);
}
.platform__card--featured .platform__card__label { color: rgba(255,255,255,.6); }

.platform__card__title { font-size: 1.25rem; font-weight: 800; color: var(--color-text); }
.platform__card--featured .platform__card__title { color: #fff; }

.platform__card__desc { font-size: .9375rem; color: var(--color-muted); line-height: 1.65; }
.platform__card--featured .platform__card__desc { color: rgba(255,255,255,.75); }

.platform__card__features {
  display: flex; flex-direction: column; gap: 8px;
  padding: 16px 0; border-top: 1px solid var(--color-border);
  margin-top: 4px; flex: 1;
}
.platform__card--featured .platform__card__features { border-top-color: rgba(255,255,255,.2); }

.platform__card__features li {
  display: flex; align-items: center; gap: 8px;
  font-size: .875rem; color: var(--color-muted);
}
.platform__card--featured .platform__card__features li { color: rgba(255,255,255,.8); }
.platform__card__features li::before {
  content: '✓'; width: 18px; height: 18px; border-radius: 50%;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: .65rem; font-weight: 800; flex-shrink: 0;
}
.platform__card--featured .platform__card__features li::before {
  background: rgba(255,255,255,.25); color: #fff;
}

.platform__card__btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px; border-radius: var(--radius-full);
  font-size: .875rem; font-weight: 700; transition: all var(--t) var(--ease);
}
.platform__card__btn--indigo { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: #fff; }
.platform__card__btn--indigo:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(79,70,229,.4); }
.platform__card__btn--white { background: #fff; color: var(--primary); }
.platform__card__btn--white:hover { background: rgba(255,255,255,.9); transform: translateY(-1px); }
.platform__card__btn--outline { border: 2px solid var(--color-border); color: var(--color-text); }
.platform__card__btn--outline:hover { border-color: var(--primary); color: var(--primary); }

/* ── 11. How It Works ─────────────────────────────────────── */
.how-it-works { padding: var(--section-pad); background: var(--color-bg-alt); }
.how-it-works__header { margin-bottom: 64px; }

.steps {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 0; position: relative;
}
.steps--4 { grid-template-columns: repeat(4, 1fr); }

.steps::before {
  content: ''; position: absolute;
  top: 44px; left: calc(12.5% + 20px); right: calc(12.5% + 20px);
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
  background-size: 200% auto;
  animation: shimmer 2.5s linear infinite;
}
.steps--4::before { left: calc(12.5% + 20px); right: calc(12.5% + 20px); }
@keyframes shimmer { to { background-position: 200% center; } }

.step { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 0 20px; position: relative; }

.step__number {
  width: 88px; height: 88px; border-radius: 50%;
  background: var(--color-bg-alt); border: 3px solid var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem; font-weight: 900; color: var(--primary);
  margin-bottom: 24px; position: relative; z-index: 1;
  box-shadow: 0 0 0 8px var(--color-bg-alt), var(--shadow-md);
  transition: all var(--t) var(--ease);
}
.step:hover .step__number {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff; transform: scale(1.05);
  box-shadow: 0 0 0 8px var(--color-bg-alt), 0 8px 24px rgba(79,70,229,.35);
  border-color: transparent;
}

.step__title { font-size: 1.0625rem; font-weight: 700; color: var(--color-text); margin-bottom: 8px; }
.step__desc { font-size: .9375rem; color: var(--color-muted); line-height: 1.65; }

/* ── 12. Testimonials ─────────────────────────────────────── */
.testimonials { padding: var(--section-pad); background: var(--color-bg); }
.testimonials__header { margin-bottom: 56px; }
.testimonials__grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; max-width: var(--max-w); margin: 0 auto;
}

.testimonial-card {
  padding: 32px 28px; border-radius: var(--radius-lg);
  background: var(--color-bg); border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm); transition: all var(--t) var(--ease);
  display: flex; flex-direction: column; gap: 20px;
}
.testimonial-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
  border-color: rgba(79,70,229,.2);
}
.testimonial-card__stars { display: flex; gap: 3px; }
.star { color: var(--accent); font-size: .9375rem; }

.testimonial-card__quote {
  font-size: .9375rem; color: var(--color-muted); line-height: 1.75; font-style: italic; flex: 1;
}
.testimonial-card__quote::before {
  content: '\201C'; font-size: 3rem; color: var(--primary); opacity: .2;
  line-height: 0; vertical-align: -.65em; margin-right: 4px;
}
.testimonial-card__author { display: flex; align-items: center; gap: 14px; }
.testimonial-card__avatar {
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--primary-light); display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: var(--primary); flex-shrink: 0;
}
.testimonial-card__name { font-weight: 700; font-size: .9375rem; color: var(--color-text); }
.testimonial-card__role { font-size: .8125rem; color: var(--color-light); }

/* ── 13. App Download ─────────────────────────────────────── */
.app-download {
  padding: var(--section-pad);
  background: linear-gradient(135deg, #0D1117 0%, #0D0A1E 50%, #0D1A1A 100%);
  position: relative; overflow: hidden;
}

/* Animated particles */
.app-download__particles { position: absolute; inset: 0; pointer-events: none; }
.app-download__particles span {
  position: absolute; width: 3px; height: 3px; border-radius: 50%;
  background: rgba(255,255,255,.15); animation: particleDrift linear infinite;
}
.app-download__particles span:nth-child(1)  { left: 10%; top: 20%; animation-duration: 12s; animation-delay: 0s; }
.app-download__particles span:nth-child(2)  { left: 25%; top: 60%; animation-duration: 18s; animation-delay: 2s; width: 2px; height: 2px; }
.app-download__particles span:nth-child(3)  { left: 55%; top: 15%; animation-duration: 15s; animation-delay: 4s; }
.app-download__particles span:nth-child(4)  { left: 75%; top: 70%; animation-duration: 20s; animation-delay: 1s; width: 4px; height: 4px; }
.app-download__particles span:nth-child(5)  { left: 90%; top: 35%; animation-duration: 13s; animation-delay: 6s; }
.app-download__particles span:nth-child(6)  { left: 40%; top: 80%; animation-duration: 16s; animation-delay: 3s; }
.app-download__particles span:nth-child(7)  { left: 65%; top: 45%; animation-duration: 22s; animation-delay: 5s; width: 2px; height: 2px; }
.app-download__particles span:nth-child(8)  { left: 15%; top: 85%; animation-duration: 14s; animation-delay: 7s; }
.app-download__particles span:nth-child(9)  { left: 80%; top: 10%; animation-duration: 19s; animation-delay: 2.5s; width: 4px; height: 4px; }
.app-download__particles span:nth-child(10) { left: 35%; top: 30%; animation-duration: 17s; animation-delay: 8s; }
@keyframes particleDrift {
  0%   { transform: translateY(0) translateX(0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { transform: translateY(-100px) translateX(20px); opacity: 0; }
}

.app-download__inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 72px; align-items: center; position: relative; z-index: 1;
}

.app-download__label { color: rgba(255,255,255,.5); }
.app-download__title {
  color: #fff; font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 800; letter-spacing: -.03em; margin-bottom: 16px;
}
.app-download__subtitle {
  color: rgba(255,255,255,.6); font-size: 1.0625rem; line-height: 1.7; margin-bottom: 28px;
}

.app-download__checklist {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; margin-bottom: 36px;
}
.app-download__check {
  display: flex; align-items: center; gap: 8px;
  font-size: .875rem; color: rgba(255,255,255,.7);
}
.app-download__check svg { color: var(--success); flex-shrink: 0; }

.app-download__buttons { display: flex; flex-wrap: wrap; gap: 14px; }

.store-btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 13px 22px;
  background: rgba(255,255,255,.08);
  border: 1.5px solid rgba(255,255,255,.2);
  border-radius: var(--radius-md); color: #fff;
  transition: all var(--t) var(--ease); backdrop-filter: blur(8px);
}
.store-btn:hover {
  background: rgba(255,255,255,.15); border-color: rgba(255,255,255,.45);
  transform: translateY(-2px); box-shadow: 0 10px 28px rgba(0,0,0,.3);
}
.store-btn--web { border-color: rgba(79,70,229,.5); }
.store-btn--web:hover { border-color: var(--primary); background: rgba(79,70,229,.15); }

.store-btn__icon { width: 32px; height: 32px; flex-shrink: 0; }
.store-btn__icon--emoji { font-size: 1.5rem; display: flex; align-items: center; width: 32px; }
.store-btn__text { display: flex; flex-direction: column; line-height: 1.2; }
.store-btn__small { font-size: .6875rem; opacity: .7; letter-spacing: .04em; text-transform: uppercase; }
.store-btn__big { font-size: 1rem; font-weight: 700; }

.app-download__visual { display: flex; justify-content: center; }

/* ── 14. Footer ───────────────────────────────────────────── */
.footer {
  background: var(--color-bg-dark); color: rgba(255,255,255,.55);
  padding: 64px 24px 32px;
}
.footer__inner { max-width: var(--max-w); margin: 0 auto; }
.footer__top {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08); margin-bottom: 32px;
}
.footer__brand { display: flex; flex-direction: column; gap: 14px; }
.footer__logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 800; color: #fff;
}
.footer__tagline { font-size: .9rem; line-height: 1.65; max-width: 280px; }
.footer__labs-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: var(--radius-full);
  background: rgba(167,139,250,.15); border: 1px solid rgba(167,139,250,.25);
  color: #C4B5FD; font-size: .75rem; font-weight: 700; width: fit-content;
}
.footer__col-title {
  font-size: .8125rem; font-weight: 700; color: #fff;
  text-transform: uppercase; letter-spacing: .08em; margin-bottom: 16px;
}
.footer__links { display: flex; flex-direction: column; gap: 10px; }
.footer__links a {
  font-size: .875rem; color: rgba(255,255,255,.5); transition: color var(--t);
}
.footer__links a:hover { color: #fff; }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px; font-size: .875rem;
}
.footer__legal { display: flex; gap: 24px; }
.footer__legal a { color: rgba(255,255,255,.4); transition: color var(--t); }
.footer__legal a:hover { color: #fff; }

/* ── 15. Fade-in Animations ───────────────────────────────── */
.fade-in {
  opacity: 0; transform: translateY(28px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
}
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: .1s; }
.fade-in-delay-2 { transition-delay: .2s; }
.fade-in-delay-3 { transition-delay: .3s; }
.fade-in-delay-4 { transition-delay: .4s; }

/* ── 16. Responsive — Tablet ──────────────────────────────── */
@media (max-width: 1024px) {
  :root { --section-pad: 72px 24px; }
  .hero__inner { gap: 36px; }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .platform__grid { grid-template-columns: repeat(2, 1fr); }
  .platform__grid .platform__card:last-child { grid-column: 1/-1; max-width: 420px; margin: 0 auto; width: 100%; }
  .labs__grid { grid-template-columns: repeat(3, 1fr); }
  .steps--4 { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .steps--4::before { display: none; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ── 17. Responsive — Mobile ──────────────────────────────── */
@media (max-width: 768px) {
  :root { --section-pad: 56px 20px; }

  .navbar__links { display: none; }
  .navbar__hamburger { display: flex; }

  .hero { padding: 120px 20px 60px; }
  .hero__inner { grid-template-columns: 1fr; text-align: center; }
  .hero__subtitle { margin: 0 auto 36px; }
  .hero__actions { justify-content: center; }
  .hero__stats { justify-content: center; }
  .hero__visual { order: -1; }
  .hero__svg-wrap { max-width: 320px; }
  .hero__float--a { right: -10px; }
  .hero__float--b { left: -10px; }
  .hero__float--c { right: -10px; }

  .trust-bar__label { display: none; }

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

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

  .platform__grid { grid-template-columns: 1fr; }
  .platform__grid .platform__card:last-child { max-width: 100%; }

  .steps { grid-template-columns: 1fr; gap: 40px; }
  .steps::before, .steps--4::before { display: none; }
  .step { padding: 0; }

  .app-download__inner { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .app-download__checklist { grid-template-columns: 1fr; }
  .app-download__buttons { justify-content: center; }
  .app-download__visual { order: -1; }

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

  .footer__top { grid-template-columns: 1fr; gap: 28px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 2rem; }
  .labs__grid { grid-template-columns: 1fr; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn, .hero__actions .btn-outline-purple { justify-content: center; width: 100%; }
  .btn { padding: 13px 22px; font-size: .875rem; }
}