/* ============================================
   AI & BUSINESS HACKATHON v2 — PREMIUM DARK DESIGN
   Immersive, bold, world-class
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700;800&display=swap');

/* --- Custom Properties --- */
:root {
  --bg: #06060F;
  --bg2: #0D0D1A;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --surface: rgba(255,255,255,0.06);
  --text: #FFFFFF;
  --text-muted: rgba(255,255,255,0.5);
  --text-dim: rgba(255,255,255,0.25);
  --accent: #7C3AED;
  --accent-light: #A78BFA;
  --accent2: #06D6A0;
  --pink: #EC4899;
  --blue: #3B82F6;
  --gradient: linear-gradient(135deg, #7C3AED 0%, #A855F7 50%, #06D6A0 100%);
  --gradient-text: linear-gradient(135deg, #A78BFA 0%, #7C3AED 50%, #06D6A0 100%);
  --glow: 0 0 40px rgba(124, 58, 237, 0.4);
  --glow-sm: 0 0 20px rgba(124, 58, 237, 0.25);
  --border: rgba(255,255,255,0.07);
  --border-bright: rgba(255,255,255,0.15);
  --radius: 20px;
  --radius-sm: 12px;
  --radius-full: 100px;
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: auto; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* --- Utility --- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 40px; }

/* ============================================
   PRELOADER
   ============================================ */
.preloader {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center; flex-direction: column;
  transition: opacity 0.8s var(--ease), visibility 0.8s;
}
.preloader.done { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader__text {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 4rem); font-weight: 700;
  color: var(--text); letter-spacing: -0.03em;
}
.preloader__text span {
  display: inline-block;
  background: var(--gradient-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.preloader__bar {
  width: 240px; height: 2px; background: rgba(255,255,255,0.08);
  border-radius: 2px; margin-top: 40px; overflow: hidden;
}
.preloader__fill {
  width: 0%; height: 100%; background: var(--gradient);
  border-radius: 2px; transition: width 1.6s var(--ease);
}
.preloader.loading .preloader__fill { width: 100%; }

/* ============================================
   GLOBAL ANIMATED BACKGROUND
   ============================================ */
.site-bg {
  position: fixed; inset: 0; z-index: -1; overflow: hidden;
  background: var(--bg);
}
.site-bg__orb {
  position: absolute; border-radius: 50%;
  filter: blur(120px); opacity: 0.18;
  animation: orb-float 20s ease-in-out infinite;
}
.site-bg__orb--1 {
  width: 800px; height: 800px;
  background: radial-gradient(circle, #7C3AED, transparent 70%);
  top: -200px; left: -200px; animation-delay: 0s;
}
.site-bg__orb--2 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #06D6A0, transparent 70%);
  bottom: -100px; right: -100px; animation-delay: 7s;
}
.site-bg__orb--3 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #EC4899, transparent 70%);
  top: 50%; left: 50%; transform: translate(-50%,-50%); animation-delay: 14s; opacity: 0.1;
}
@keyframes orb-float {
  0%,100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(40px,-40px) scale(1.08); }
  66% { transform: translate(-30px,30px) scale(0.95); }
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0;
  transition: all 0.4s var(--ease);
}
.nav--solid {
  background: rgba(6,6,15,0.85);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.nav__logo {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-display); font-size: 1rem; font-weight: 700;
  color: var(--text); letter-spacing: -0.02em;
}
.nav__logo-accent {
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav__logo-sep { opacity: 0.25; font-weight: 300; margin: 0 2px; }
.nav__logo-sub { font-weight: 600; color: var(--text-muted); font-size: 0.95rem; }
.nav__logo-city {
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav__links { display: flex; align-items: center; gap: 8px; }
.nav__link {
  padding: 8px 14px; border-radius: 8px;
  font-size: 0.88rem; font-weight: 500; color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}
.nav__link:hover, .nav__link.active { color: var(--text); background: var(--surface); }
.nav__cta {
  margin-left: 8px; padding: 9px 22px;
  background: var(--gradient); border-radius: var(--radius-full);
  font-size: 0.88rem; font-weight: 600; color: #fff;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(124,58,237,0.4);
}
.nav__cta:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 8px 30px rgba(124,58,237,0.5); }

.nav__tg-icon {
  display: flex; align-items: center; justify-content: center;
  margin-left: 6px; width: 38px; height: 38px;
  border-radius: 50%; background: rgba(42,174,247,0.15);
  color: #2AAEF7; border: 1px solid rgba(42,174,247,0.3);
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  flex-shrink: 0;
}
.nav__tg-icon:hover { background: rgba(42,174,247,0.28); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(42,174,247,0.3); }
.nav__tg-icon svg { display: block; }

.nav__burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav__burger span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.3s; }

.nav__mobile {
  display: none; position: fixed; top: 70px; left: 0; right: 0; z-index: 99;
  background: rgba(6,6,15,0.97); backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  flex-direction: column; padding: 16px 40px 24px;
  gap: 4px; transform: translateY(-10px); opacity: 0;
  pointer-events: none; transition: all 0.3s var(--ease);
}
.nav__mobile.open { display: flex; transform: translateY(0); opacity: 1; pointer-events: all; }
.nav__mobile a { padding: 10px 0; font-size: 1rem; color: var(--text-muted); transition: color 0.2s; }
.nav__mobile a:hover { color: var(--text); }

/* Scroll Progress Bar */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: var(--gradient); z-index: 1000;
  transition: width 0.1s linear;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
#hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}
.hero__orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); pointer-events: none;
}
.hero__orb--1 {
  width: 700px; height: 700px; top: -200px; left: -150px;
  background: radial-gradient(circle, rgba(124,58,237,0.35), transparent 65%);
  animation: orb-float 18s ease-in-out infinite;
}
.hero__orb--2 {
  width: 500px; height: 500px; top: 20%; right: -100px;
  background: radial-gradient(circle, rgba(6,214,160,0.2), transparent 65%);
  animation: orb-float 14s ease-in-out infinite; animation-delay: 5s;
}
.hero__orb--3 {
  width: 400px; height: 400px; bottom: -80px; left: 30%;
  background: radial-gradient(circle, rgba(236,72,153,0.15), transparent 65%);
  animation: orb-float 22s ease-in-out infinite; animation-delay: 10s;
}

.hero__content {
  position: relative; z-index: 2;
  max-width: 900px; margin: 0 auto; text-align: center;
}
.hero__date {
  display: inline-block;
  font-size: 0.85rem; font-weight: 500; color: var(--accent-light);
  letter-spacing: 0.08em; text-transform: uppercase;
  background: rgba(124,58,237,0.12); border: 1px solid rgba(124,58,237,0.25);
  padding: 7px 18px; border-radius: var(--radius-full);
  margin-bottom: 32px;
}
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 7rem);
  font-weight: 800; line-height: 1.0; letter-spacing: -0.035em;
  color: var(--text); margin-bottom: 28px;
}
.hero__title em {
  font-style: normal;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero__sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-muted); max-width: 680px; margin: 0 auto 40px;
  line-height: 1.7;
}
.hero__tags {
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 48px;
}
/* Mobile tags: hidden on desktop */
.hero__tags-mobile { display: none; }
.hero__tag {
  padding: 6px 16px; border-radius: var(--radius-full);
  font-size: 0.82rem; font-weight: 500; color: var(--text-muted);
  background: var(--surface); border: 1px solid var(--border);
}

/* Drum / slot-machine tag rotator */
.hero__tag-drum {
  position: relative;
  display: inline-block;
  height: 34px;           /* fixed — matches tag height below */
  min-width: 240px;
  user-select: none;
  -webkit-user-select: none;
}
.hero__tag--drum {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%) translateY(0);
  opacity: 0;
  padding: 6px 20px;
  white-space: nowrap;
  border-radius: var(--radius-full);
  font-size: 0.82rem; font-weight: 500; color: var(--text-muted);
  background: var(--surface); border: 1px solid var(--border);
  /* transitions for fade+slide */
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
}
/* Active tag: visible, centred */
.hero__tag--drum.drum-active {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
/* Exiting tag: slide up and fade */
.hero__tag--drum.drum-exit {
  opacity: 0;
  transform: translateX(-50%) translateY(-16px);
}
/* Entering tag: slide in from below */
.hero__tag--drum.drum-enter {
  opacity: 0;
  transform: translateX(-50%) translateY(16px);
  transition: none; /* no transition while positioning below */
}
.hero__cta { display: flex; align-items: center; justify-content: center; gap: 16px; }
.hero__scroll {
  position: absolute; bottom: 40px; left: 50%;
  transform: translateX(-50%); z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.hero__scroll-line {
  width: 1px; height: 56px;
  background: linear-gradient(to bottom, transparent, var(--accent-light), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}
.hero__scroll span { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim); }
@keyframes scroll-pulse {
  0%,100% { opacity: 0.3; transform: scaleY(0.8); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 28px; border-radius: var(--radius-full);
  font-weight: 600; font-size: 0.95rem;
  transition: all 0.25s var(--ease); cursor: pointer;
  position: relative; overflow: hidden;
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; transition: transform 0.25s; }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 4px 24px rgba(124,58,237,0.4);
}
.btn--primary:hover { box-shadow: 0 8px 32px rgba(124,58,237,0.55); transform: translateY(-2px); }
.btn--primary::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
  pointer-events: none;
}

.btn--outline {
  background: transparent; color: var(--text);
  border: 1px solid var(--border-bright);
}
.btn--outline:hover { background: var(--surface); border-color: rgba(255,255,255,0.25); transform: translateY(-2px); }

.btn--tg {
  background: rgba(42,174,247,0.12); color: #2AAEF7;
  border: 1px solid rgba(42,174,247,0.35);
  gap: 10px;
}
.btn--tg:hover { background: rgba(42,174,247,0.22); border-color: rgba(42,174,247,0.6); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(42,174,247,0.25); }
.btn--tg svg { flex-shrink: 0; }

.btn--large { padding: 18px 36px; font-size: 1.05rem; }
.btn--ghost { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn--ghost:hover { background: var(--bg-card-hover); }

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: 120px 0; position: relative;
}
.section--gray {
  background: var(--bg2);
}
.section--accent {
  background: linear-gradient(160deg, #0C0820 0%, #130D2E 50%, #0C0820 100%);
}

.section__header { margin-bottom: 64px; }
.section__header--center { text-align: center; }
.section__badge {
  display: inline-block;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-light);
  background: rgba(124,58,237,0.1); border: 1px solid rgba(124,58,237,0.2);
  padding: 6px 16px; border-radius: var(--radius-full);
  margin-bottom: 20px;
}
.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.8rem);
  font-weight: 800; line-height: 1.1; letter-spacing: -0.03em;
  color: var(--text); margin-bottom: 20px;
}
.section__title em {
  font-style: normal;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section__subtitle {
  font-size: 1.1rem; color: var(--text-muted); max-width: 600px;
}
.section__header--center .section__subtitle { margin: 0 auto; }

/* ============================================
   ABOUT STATS
   ============================================ */
.about-stat {
  text-align: center; padding: 32px 20px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius);
}
.about-stat__num {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800; line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px; letter-spacing: -0.04em;
}
.about-stat__label {
  font-size: 0.9rem; color: var(--text-muted); line-height: 1.5;
}

/* ============================================
   GRID LAYOUT
   ============================================ */
.grid { display: grid; gap: 20px; }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

/* ============================================
   CARDS (Benefits)
   ============================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative; overflow: hidden;
  transition: all 0.35s var(--ease);
}
.card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--mx,50%) var(--my,50%), rgba(124,58,237,0.07), transparent 40%);
  pointer-events: none; opacity: 0; transition: opacity 0.4s;
}
.card:hover { background: var(--bg-card-hover); border-color: var(--border-bright); transform: translateY(-4px); }
.card:hover::before { opacity: 1; }

.card__icon {
  width: 52px; height: 52px;
  background: rgba(124,58,237,0.12); border: 1px solid rgba(124,58,237,0.2);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px; color: var(--accent-light);
}
.card__icon svg { width: 24px; height: 24px; }
.card__title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.card__text { font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; }

/* ============================================
   AUDIENCE SECTION
   ============================================ */
.audience__grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px;
}
.audience__grid--centered {
  grid-template-columns: repeat(4, 1fr);
  max-width: 960px; margin-left: auto; margin-right: auto;
}
.audience-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 20px 24px;
  text-align: center;
  transition: all 0.3s var(--ease);
}
.audience-card:hover { background: var(--bg-card-hover); border-color: var(--border-bright); transform: translateY(-4px); }
.audience-card--active { background: var(--bg-card-hover); border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 4px 20px rgba(124,58,237,0.2); }
.audience-card__icon {
  width: 48px; height: 48px;
  background: rgba(124,58,237,0.1); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px; color: var(--accent-light);
}
.audience-card__icon svg { width: 22px; height: 22px; }
.audience-card__title { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.audience-card__text { font-size: 0.82rem; color: var(--text-muted); line-height: 1.55; }

/* ============================================
   MISSION SECTION
   ============================================ */
.mission {
  position: relative; overflow: hidden;
}
.mission__quote {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.5vw, 2rem);
  font-weight: 500; color: rgba(255,255,255,0.7);
  line-height: 1.55; max-width: 860px;
  border-left: 3px solid var(--accent); padding-left: 32px;
  margin-bottom: 24px;
}
.mission__author {
  font-size: 0.9rem; color: var(--text-muted);
  margin-bottom: 64px; padding-left: 35px;
}
.mission__statement {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800; line-height: 1.15; letter-spacing: -0.03em;
  color: var(--text); max-width: 820px; margin-bottom: 28px;
}
.mission__desc {
  font-size: 1.1rem; color: var(--text-muted); max-width: 700px; line-height: 1.75;
}

/* ============================================
   CASES SECTION
   ============================================ */
.case-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px 32px;
  transition: all 0.35s var(--ease); position: relative; overflow: hidden;
}
.case-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient); transform: scaleX(0); transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.case-card:hover { background: var(--bg-card-hover); border-color: var(--border-bright); transform: translateY(-4px); }
.case-card:hover::after { transform: scaleX(1); }

.case-card__icon {
  width: 52px; height: 52px; background: rgba(6,214,160,0.1);
  border: 1px solid rgba(6,214,160,0.2); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px; color: var(--accent2);
}
.case-card__icon svg { width: 24px; height: 24px; }
.case-card__dir { font-size: 1.15rem; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.case-card__text { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 20px; }
.case-card__company {
  font-size: 0.78rem; color: var(--text-dim);
  border-top: 1px solid var(--border); padding-top: 16px; display: block;
}

/* ============================================
   TIMELINE (Vertical, animated)
   ============================================ */
.timeline-section { background: var(--bg); }
.timeline {
  position: relative; max-width: 820px; margin: 0 auto;
}
.timeline__track {
  position: absolute; left: 24px; top: 0; bottom: 0; width: 2px;
  background: var(--border);
}
.timeline__progress {
  width: 100%; height: 0%; background: var(--gradient);
  border-radius: 2px; transition: height 0.1s linear;
}

.timeline__stage { position: relative; padding-left: 72px; margin-bottom: 56px; }
.timeline__stage:last-child { margin-bottom: 0; }

.timeline__stage-badge {
  margin-bottom: 20px;
}
.timeline__stage-badge span {
  display: inline-block;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent-light);
  background: rgba(124,58,237,0.1); border: 1px solid rgba(124,58,237,0.2);
  padding: 5px 14px; border-radius: var(--radius-full);
}

.timeline__step {
  position: relative; margin-bottom: 16px;
}
.timeline__step:last-child { margin-bottom: 0; }

.timeline__node {
  position: absolute; left: -57px; top: 18px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg2); border: 2px solid var(--border);
  transition: all 0.4s var(--ease); z-index: 2;
}
.timeline__step.active .timeline__node {
  background: var(--gradient);
  border-color: transparent;
  box-shadow: 0 0 16px rgba(124,58,237,0.5);
  transform: scale(1.3);
}

.timeline__step-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 20px 24px;
  transition: all 0.3s var(--ease);
}
.timeline__step.active .timeline__step-card {
  background: rgba(124,58,237,0.08);
  border-color: rgba(124,58,237,0.25);
}
.timeline__step-card h4 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.timeline__step-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }
.timeline__date {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--accent-light); background: rgba(124,58,237,0.1);
  border: 1px solid rgba(124,58,237,0.2);
  padding: 2px 10px; border-radius: var(--radius-full);
  white-space: nowrap;
}

/* ============================================
   CRITERIA
   ============================================ */
.criteria-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
  transition: all 0.3s var(--ease);
}
.criteria-card:hover { background: var(--bg-card-hover); border-color: var(--border-bright); transform: translateY(-3px); }
.criteria-card__num {
  font-family: var(--font-display); font-size: 3rem; font-weight: 800;
  color: var(--border-bright); line-height: 1; margin-bottom: 16px;
  letter-spacing: -0.05em;
}
.criteria-card__title { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-bottom: 16px; }
.criteria-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.criteria-card__tag {
  font-size: 0.75rem; font-weight: 500; padding: 4px 12px;
  border-radius: var(--radius-full); border: 1px solid;
}
.criteria-card__tag--team { color: var(--accent-light); border-color: rgba(124,58,237,0.3); background: rgba(124,58,237,0.08); }
.criteria-card__tag--biz { color: var(--accent2); border-color: rgba(6,214,160,0.3); background: rgba(6,214,160,0.08); }
.criteria-card--note { border-style: dashed; }
.criteria-card__note-text { font-size: 0.88rem; color: var(--text-muted); line-height: 1.65; margin-top: 4px; }

/* Desktop: show header as normal block, hide accordion-only parts */
.criteria-card__header { display: block; padding: 0; }
.criteria-card__body { display: none; }
.criteria-card__chevron { display: none; }

/* ============================================
   FAQ
   ============================================ */
.faq { max-width: 740px; margin: 0 auto; }
.faq__item {
  border-bottom: 1px solid var(--border); overflow: hidden;
}
.faq__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 22px 0; text-align: left;
  font-size: 1rem; font-weight: 600; color: var(--text);
  gap: 16px; transition: color 0.2s;
}
.faq__q:hover { color: var(--accent-light); }
.faq__icon { flex-shrink: 0; width: 24px; height: 24px; color: var(--accent-light); transition: transform 0.35s var(--ease); }
.faq__item.open .faq__icon { transform: rotate(45deg); }
.faq__a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.4s var(--ease); }
.faq__item.open .faq__a { grid-template-rows: 1fr; }
.faq__a-inner {
  overflow: hidden;
  padding: 0 0 0 0;
  font-size: 0.93rem; color: var(--text-muted); line-height: 1.75;
}
.faq__item.open .faq__a-inner { padding-bottom: 22px; }

/* ============================================
   SOCIAL SECTION
   ============================================ */
.social-section { position: relative; overflow: hidden; }
.social-section__orb {
  position: absolute; border-radius: 50%; filter: blur(100px); pointer-events: none;
}
.social-section__orb--1 {
  width: 500px; height: 500px; background: radial-gradient(circle, rgba(124,58,237,0.25), transparent);
  top: -150px; right: -100px;
}
.social-section__orb--2 {
  width: 400px; height: 400px; background: radial-gradient(circle, rgba(6,214,160,0.15), transparent);
  bottom: -100px; left: -50px;
}

.social-btns { display: flex; align-items: center; justify-content: center; gap: 20px; }
.social-btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 16px 32px; border-radius: var(--radius-full);
  font-size: 1rem; font-weight: 700;
  transition: all 0.3s var(--ease);
}
.social-btn svg { width: 24px; height: 24px; }
.social-btn--tg { background: #2AABEE; color: #fff; box-shadow: 0 4px 20px rgba(42,171,238,0.35); }
.social-btn--tg:hover { background: #229DD3; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(42,171,238,0.45); }
.social-btn--max { background: var(--bg-card); border: 1px solid var(--border-bright); color: var(--text); }
.social-btn--max:hover { background: var(--bg-card-hover); transform: translateY(-2px); }

/* ============================================
   CONTACT
   ============================================ */
.contact__cta { text-align: center; margin-bottom: 64px; }
.contact__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  max-width: 800px; margin: 0 auto;
}
.contact__item {
  display: flex; align-items: flex-start; gap: 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 20px 22px;
  transition: all 0.3s;
}
.contact__item:hover { background: var(--bg-card-hover); border-color: var(--border-bright); }
.contact__item-icon {
  width: 42px; height: 42px; border-radius: var(--radius-sm);
  background: rgba(124,58,237,0.1); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact__item-label { font-size: 0.75rem; color: var(--text-dim); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.06em; }
.contact__item-value { font-size: 0.9rem; font-weight: 600; color: var(--text); }

/* ============================================
   PARTNERS
   ============================================ */
.partners { overflow: hidden; }
.marquee {
  overflow: hidden; -webkit-mask: linear-gradient(90deg, transparent, white 15%, white 85%, transparent);
}
.marquee__track {
  display: flex; gap: 48px; width: max-content;
  animation: marquee 30s linear infinite;
}
.marquee__track span {
  font-family: var(--font-display); font-size: 1.2rem; font-weight: 700;
  color: var(--text-dim); white-space: nowrap; padding: 0 16px;
}
@keyframes marquee { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg); border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer__top {
  display: grid; grid-template-columns: 1.5fr 1fr 1.5fr; gap: 48px;
  margin-bottom: 48px;
}
.footer__logo {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-display); font-size: 1rem; font-weight: 700;
  color: var(--text); margin-bottom: 12px;
}
.footer__logo-accent {
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.footer__logo-sep { opacity: 0.2; font-weight: 300; margin: 0 2px; }
.footer__logo-city {
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.footer__org { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 6px; }
.footer__date { font-size: 0.85rem; color: var(--text-dim); }

.footer__nav-title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); margin-bottom: 16px; }
.footer__links { display: flex; flex-direction: column; gap: 10px; }
.footer__link { font-size: 0.88rem; color: var(--text-muted); transition: color 0.2s; }
.footer__link:hover { color: var(--text); }

.footer__partner-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
}
.footer__partner-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.footer__partner-text { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 20px; line-height: 1.6; }

.footer__bottom {
  border-top: 1px solid var(--border); padding-top: 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.footer__copy { font-size: 0.82rem; color: var(--text-dim); }
.footer__socials { display: flex; gap: 12px; }
.footer__social {
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--surface); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); transition: all 0.25s;
}
.footer__social:hover { background: var(--bg-card-hover); border-color: var(--border-bright); color: var(--text); }
.footer__social svg { width: 18px; height: 18px; }

/* ============================================
   MODAL
   ============================================ */
.modal {
  position: fixed; inset: 0; z-index: 999;
  display: none; align-items: center; justify-content: center;
  padding: 20px;
}
.modal.open { display: flex; }
.modal__overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.7); backdrop-filter: blur(8px);
  cursor: pointer;
}
.modal__box {
  position: relative; z-index: 1;
  background: var(--bg2); border: 1px solid var(--border-bright);
  border-radius: var(--radius); padding: 44px 40px;
  max-width: 460px; width: 100%;
  animation: modal-in 0.4s var(--ease);
}
@keyframes modal-in { from { opacity: 0; transform: scale(0.95) translateY(8px); } }
.modal__title { font-family: var(--font-display); font-size: 1.5rem; font-weight: 800; color: var(--text); margin-bottom: 16px; }
.modal__text { font-size: 0.93rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 32px; }
.modal__actions { display: flex; flex-direction: column; gap: 12px; }

/* ============================================
   ANIMATION CLASSES (for JS)
   ============================================ */
.gs-reveal {
  opacity: 0;
  transform: translateY(32px);
}
.gs-reveal-scale {
  opacity: 0;
  transform: scale(0.94);
}
.gs-stagger > * {
  opacity: 0;
  transform: translateY(24px);
}
.gs-fade {
  opacity: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .audience__grid { grid-template-columns: repeat(3, 1fr); }
  .audience__grid--centered { grid-template-columns: repeat(2, 1fr); max-width: 640px; }
  .footer__top { grid-template-columns: 1fr 1fr; }
  .footer__partner-box { grid-column: 1/-1; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .section__title { font-size: 1.8rem; }
  .section__subtitle { font-size: 0.9rem; }

  /* NAV */
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__tg-icon { display: none; }
  .nav__burger { display: flex; }

  /* HERO */
  .hero { padding: 100px 0 60px; }
  .hero__title { font-size: clamp(2.2rem, 8vw, 3.5rem); }
  .hero__sub { font-size: 0.95rem; }

  /* Mobile: hide desktop drum, show mobile drum */
  .hero__tag-drum { display: none; }
  .hero__tags-mobile {
    display: inline-block;
    position: relative;
    height: 34px;
    width: calc(100vw - 80px);
    max-width: 340px;
    flex: none;
    overflow: visible;
    user-select: none;
    -webkit-user-select: none;
  }
  /* Мобильные drum-теги: полностью независимые стили, без конфликта с .hero__tag */
  .hero__tag-mob-drum {
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%) translateY(16px);
    opacity: 0;
    padding: 6px 20px;
    white-space: nowrap;
    border-radius: var(--radius-full);
    font-size: 0.82rem; font-weight: 500; color: var(--text-muted);
    background: var(--surface); border: 1px solid var(--border);
    transition: opacity 0.5s ease, transform 0.5s ease;
    pointer-events: none;
  }
  .hero__tag-mob-drum.drum-active {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
  }
  .hero__tag-mob-drum.drum-exit {
    opacity: 0;
    transform: translateX(-50%) translateY(-16px);
  }
  .hero__tag-mob-drum.drum-enter {
    opacity: 0;
    transform: translateX(-50%) translateY(16px);
    transition: none;
  }

  /* Hero CTA */
  .hero__cta { flex-direction: column; align-items: stretch; gap: 12px; }
  .btn--large { justify-content: center; padding: 15px 28px; font-size: 1rem; }

  /* ABOUT STATS: 3 in a row, equal width, compact */
  .about-stat { padding: 20px 8px; box-sizing: border-box; }
  .about-stat__num { font-size: clamp(1.8rem, 6.5vw, 2.8rem); margin-bottom: 6px; }
  .about-stat__label { font-size: 0.76rem; }
  /* Stats grid stays 3-column on mobile — override the grid--3 rule */
  .grid--3.about-stats-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  /* Ensure all stat cells are equal width */
  .grid--3.about-stats-grid .about-stat { width: 100%; min-width: 0; }

  /* Generic grid fallback */
  .grid--2 { grid-template-columns: 1fr; }

  /* ---- SWIPE SLIDER (benefits + cases) ---- */
  .mobile-slider-wrap {
    position: relative; overflow: hidden;
    margin: 0 -20px; /* bleed to edge */
    padding: 0 20px;
  }
  .mobile-slider-track {
    display: flex; gap: 12px; align-items: stretch;
    overflow-x: hidden; /* JS controls position via scrollTo */
    overscroll-behavior-x: contain;
    scrollbar-width: none; padding-bottom: 8px;
    padding-right: 20px;
  }
  .mobile-slider-track::-webkit-scrollbar { display: none; }
  .mobile-slider-track .card,
  .mobile-slider-track .case-card {
    flex: 0 0 80vw; max-width: 300px;
    padding: 20px 18px;
    display: flex; flex-direction: column;
  }
  /* Equal height: push tags/company to bottom */
  .mobile-slider-track .card__text { flex: 1; }
  .mobile-slider-track .case-card__text { flex: 1; }
  .mobile-slider-track .card__icon { width: 40px; height: 40px; margin-bottom: 10px; }
  .mobile-slider-track .card__icon svg { width: 20px; height: 20px; }
  .mobile-slider-track .card__title { font-size: 0.95rem; margin-bottom: 8px; }
  .mobile-slider-track .card__text { font-size: 0.82rem; }
  .mobile-slider-track .case-card__icon { width: 44px; height: 44px; margin-bottom: 10px; }
  .mobile-slider-track .case-card__dir { font-size: 0.92rem; margin-bottom: 8px; }
  .mobile-slider-track .case-card__text { font-size: 0.82rem; margin-bottom: 12px; }
  .mobile-slider-track .case-card__company { font-size: 0.76rem; }

  /* Slider dots */
  .mobile-slider-dots {
    display: flex; justify-content: center; gap: 6px; margin-top: 14px;
  }
  .mobile-slider-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--border-bright); transition: all 0.25s;
    cursor: pointer; border: none; padding: 0;
  }
  .mobile-slider-dot.active {
    width: 20px; border-radius: 3px;
    background: var(--accent);
  }

  /* ---- CRITERIA: accordion on mobile ---- */
  .grid--3.criteria-grid {
    display: flex; flex-direction: column;
    gap: 0;
  }
  .criteria-card {
    padding: 0;
    border-radius: 0;
    border-left: none; border-right: none; border-top: none;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
  }
  .criteria-card:first-child { border-top: 1px solid var(--border); border-radius: var(--radius) var(--radius) 0 0; }
  .criteria-card:last-child { border-radius: 0 0 var(--radius) var(--radius); }
  /* Note card: always visible, no accordion, static padding */
  .criteria-card--note {
    display: block;
    padding: 14px 16px !important;
    cursor: default;
    border-style: dashed;
  }
  .criteria-card--note .criteria-card__header { display: none; }
  .criteria-card--note .criteria-card__body { display: none; }
  .criteria-card--note .criteria-card__note-text { display: block; font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; margin-top: 6px; }
  .criteria-card--note .criteria-card__num { font-size: 1.1rem; margin-bottom: 4px; }
  .criteria-card--note .criteria-card__title { font-size: 0.88rem; margin-bottom: 0; }

  /* Accordion elements: show on mobile */
  .criteria-card__header {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 16px;
  }
  .criteria-card__body { display: grid; }
  .criteria-card__chevron { display: block; }
  .criteria-card__num { font-size: 1.1rem; margin-bottom: 0; min-width: 28px; }
  .criteria-card__title { font-size: 0.92rem; margin-bottom: 0; flex: 1; }
  .criteria-card__chevron {
    width: 18px; height: 18px; flex-shrink: 0;
    color: var(--text-muted); transition: transform 0.3s var(--ease);
  }
  .criteria-card--open .criteria-card__chevron { transform: rotate(180deg); }
  .criteria-card--open { border-color: var(--accent); background: var(--bg-card-hover); }

  /* Accordion body */
  .criteria-card__body {
    display: grid; grid-template-rows: 0fr;
    transition: grid-template-rows 0.35s var(--ease);
  }
  .criteria-card--open .criteria-card__body { grid-template-rows: 1fr; }
  .criteria-card__body-inner {
    overflow: hidden;
    padding: 0 16px;
    font-size: 0.84rem; color: var(--text-muted); line-height: 1.6;
  }
  .criteria-card--open .criteria-card__body-inner { padding: 0 16px 14px; }

  /* Hide tag pills on mobile — text is in accordion body */
  .criteria-card__tags { display: none; }

  /* Hide the old shared panel */
  .criteria-desc-panel { display: none !important; }

  /* AUDIENCE: 4-in-a-row compact strip + shared description panel */
  .audience__grid--centered { grid-template-columns: repeat(4, 1fr); max-width: 100%; gap: 8px; }
  .audience-card { padding: 16px 8px 14px; }
  .audience-card__icon { width: 36px; height: 36px; margin-bottom: 8px; }
  .audience-card__icon svg { width: 18px; height: 18px; }
  .audience-card__title { font-size: 0.78rem; line-height: 1.3; margin-bottom: 0; }
  .audience-card__text { display: none; } /* hidden — shown in shared panel */

  /* Shared description panel (injected by JS) */
  .audience-desc-panel {
    margin-top: 16px; padding: 16px 20px;
    background: var(--bg-card); border: 1px solid var(--border-bright);
    border-radius: var(--radius); font-size: 0.88rem; color: var(--text-muted);
    line-height: 1.6; min-height: 52px;
    transition: opacity 0.25s ease;
  }

  /* CONTACT */
  .contact__grid { grid-template-columns: 1fr; }

  /* FOOTER */
  .footer__top { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; gap: 16px; text-align: center; }

  /* SOCIAL */
  .social-btns { flex-direction: column; }

  /* MISSION QUOTE */
  .mission__quote { font-size: clamp(1rem, 4.5vw, 1.25rem); padding-left: 20px; }
  .mission__statement { font-size: clamp(1.5rem, 6vw, 2.2rem); }
  .mission__desc { font-size: 0.95rem; }

  /* TIMELINE */
  .timeline__track { left: 16px; }
  .timeline__stage { padding-left: 52px; }
  .timeline__node { left: -44px; }
}

@media (max-width: 480px) {
  /* Audience: still 4 in a row but tighter */
  .audience__grid--centered { gap: 6px; }
  .audience-card { padding: 12px 6px 10px; }
  .audience-card__title { font-size: 0.72rem; }

  /* Stats: shrink further */
  .about-stat__num { font-size: clamp(1.6rem, 6vw, 2.4rem); }

  .modal__box { padding: 28px 20px; }
}