@import url('../fonts/fonts.css');

:root {
  --font-sans: 'Commissioner', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Piazzolla', Georgia, serif;

  --bg-primary: #0a0c14;
  --bg-secondary: #0f121d;
  --bg-card: rgba(19, 24, 38, 0.72);
  --bg-card-hover: rgba(26, 33, 52, 0.85);
  --bg-glass: rgba(13, 17, 28, 0.65);
  --bg-input: #141a29;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(100, 116, 170, 0.16);
  --border-hover: rgba(130, 150, 245, 0.35);
  --border-focus: #5b5ef4;

  --text-primary: #f5f7fa;
  --text-secondary: #9aa5be;
  --text-muted: #626e8a;
  --text-dim: #444e66;

  --brand-primary: #5b5ef4;
  --brand-hover: #6f72f7;
  --brand-dim: #3b3d8f;
  --brand-light: #eef2ff;
  --brand-glow: rgba(91, 94, 244, 0.35);
  --brand-gradient: linear-gradient(135deg, #5b5ef4 0%, #8588ff 100%);

  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-cyan: #06b6d4;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 35px var(--brand-glow);

  --container-max: 1240px;
  --header-height: 80px;
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: dark;
  background-color: var(--bg-primary);
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Atmosphere */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-glow::before {
  content: '';
  position: absolute;
  top: -150px;
  left: 20%;
  width: 600px;
  height: 500px;
  background: radial-gradient(circle, rgba(91, 94, 244, 0.18) 0%, rgba(91, 94, 244, 0) 70%);
  filter: blur(80px);
}

.ambient-glow::after {
  content: '';
  position: absolute;
  top: 30%;
  right: 15%;
  width: 500px;
  height: 450px;
  background: radial-gradient(circle, rgba(59, 61, 143, 0.14) 0%, rgba(59, 61, 143, 0) 70%);
  filter: blur(90px);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* Common Section Styles */
.section {
  padding: 108px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base), border-color var(--transition-base), height var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border-subtle);
  height: 70px;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Custom Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-primary);
  text-decoration: none;
  user-select: none;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: currentColor;
  transition: transform var(--transition-base), color var(--transition-fast);
}

.brand-logo:hover .brand-mark {
  transform: scale(1.06) rotate(3deg);
  color: var(--brand-primary);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 2px;
  position: relative;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  transition: width var(--transition-base);
  border-radius: 2px;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  background: var(--brand-gradient);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 16px rgba(91, 94, 244, 0.35);
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 94, 244, 0.5);
  filter: brightness(1.06);
  color: #ffffff;
}

.btn-cta:active {
  transform: translateY(0);
}

.btn-full {
  width: 100%;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  padding: 8px;
  cursor: pointer;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 24px;
  flex-direction: column;
  gap: 18px;
  z-index: 99;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu .nav-link {
  font-size: 1.125rem;
  padding: 8px 0;
}

/* =========================================================
   HERO SECTION & KINETIC TYPOGRAPHY + CURSOR MASK REVEAL
   ========================================================= */
.hero-section {
  padding-top: calc(var(--header-height) + 52px);
  padding-bottom: 84px;
  position: relative;
  overflow: hidden;
}

.hero-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.hero-preheader {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--brand-primary);
  text-transform: none;
  margin-bottom: -12px;
}

/* Kinetic H1 */
.hero-title {
  font-family: var(--font-sans);
  font-size: clamp(2.35rem, 5vw, 4.25rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.035em;
  max-width: 980px;
  margin: 0 auto;
  color: var(--text-primary);
  perspective: 1000px;
}

.kinetic-word {
  display: inline-block;
  white-space: nowrap;
}

.kinetic-char {
  display: inline-block;
  transform-origin: center bottom;
  will-change: transform, opacity;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
  flex-wrap: wrap;
}

/* Cursor Mask Reveal Showcase */
.hero-media-wrapper {
  width: 100%;
  max-width: 1140px;
  margin-top: 24px;
  position: relative;
}

.reveal-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--border-card);
  background-color: #0b0e17;
  cursor: crosshair;
  user-select: none;
  touch-action: none;
}

.reveal-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.reveal-layer-day {
  z-index: 1;
}

.reveal-layer-evening {
  z-index: 2;
  /* Mask applied dynamically via JS clip-path / WebGL */
  clip-path: circle(0px at 50% 50%);
  will-change: clip-path;
}

/* Subtle lighting vignette (<= 25% opacity) */
.reveal-overlay-vignette {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(0,0,0,0) 50%, rgba(10,12,20,0.22) 100%);
  pointer-events: none;
  z-index: 3;
}

/* Interactive Mask Reveal Badge / Helper */
.reveal-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  z-index: 4;
  background: rgba(15, 18, 29, 0.78);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  pointer-events: none;
}

.reveal-badge-icon {
  width: 14px;
  height: 14px;
  color: var(--brand-primary);
  animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* Floating interactive Demo Unit-Economics Card */
.hero-demo-card {
  position: absolute;
  bottom: -32px;
  right: 32px;
  z-index: 5;
  background: rgba(16, 21, 33, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  box-shadow: var(--shadow-lg), 0 0 20px rgba(91, 94, 244, 0.15);
  max-width: 440px;
  width: calc(100% - 64px);
  text-align: left;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.hero-demo-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.demo-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.demo-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-card-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.demo-metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  font-size: 0.75rem;
}

.demo-metric-item {
  display: flex;
  flex-direction: column;
}

.demo-metric-label {
  color: var(--text-muted);
  margin-bottom: 2px;
}

.demo-metric-val {
  font-weight: 600;
  color: var(--text-primary);
}

.demo-metric-val.profit {
  color: var(--accent-green);
}

/* =========================================================
   STEPS SECTION (Как это работает)
   ========================================================= */
.steps-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.step-card {
  flex: 0 1 360px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.step-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(91, 94, 244, 0.12);
  color: var(--brand-primary);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 22px;
  border: 1px solid rgba(91, 94, 244, 0.25);
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.step-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* =========================================================
   MODULES / DASHBOARD FEATURES (Что видно в кабинете)
   ========================================================= */
.features-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.feature-card {
  flex: 0 1 calc(33.333% - 16px);
  min-width: 320px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(91, 94, 244, 0.1);
  border: 1px solid rgba(91, 94, 244, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
  margin-bottom: 20px;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.08);
  background: rgba(91, 94, 244, 0.18);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.feature-pill {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* =========================================================
   TELEGRAM NOTIFICATIONS SECTION
   ========================================================= */
.telegram-card {
  max-width: 920px;
  margin: 0 auto;
  background: linear-gradient(145deg, rgba(20, 26, 42, 0.8), rgba(12, 16, 26, 0.9));
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.telegram-card::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(91, 94, 244, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.telegram-content h3 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.telegram-content p {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.telegram-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.telegram-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.telegram-bullet-icon {
  width: 18px;
  height: 18px;
  color: var(--accent-green);
  flex-shrink: 0;
  margin-top: 3px;
}

/* Mock Alert Box */
.telegram-mock-feed {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mock-msg {
  background: rgba(26, 33, 52, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.mock-msg-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mock-msg-tag {
  font-weight: 600;
  color: var(--brand-primary);
}

.mock-msg-body {
  color: var(--text-primary);
  line-height: 1.45;
}

.mock-msg.alert {
  border-left: 3px solid var(--accent-amber);
}

.mock-msg.digest {
  border-left: 3px solid var(--brand-primary);
}

/* =========================================================
   PRICING SECTION (Тарифы)
   ========================================================= */
.pricing-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  max-width: 880px;
  margin: 0 auto;
}

.pricing-card {
  flex: 0 1 calc(50% - 16px);
  min-width: 320px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.pricing-card.featured {
  background: linear-gradient(160deg, rgba(28, 36, 58, 0.9) 0%, rgba(18, 23, 38, 0.9) 100%);
  border-color: rgba(91, 94, 244, 0.35);
  box-shadow: 0 12px 36px rgba(91, 94, 244, 0.15);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}

.pricing-tier-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 18px 0 24px 0;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-price {
  font-family: var(--font-sans);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.pricing-period {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.pricing-feature-icon {
  width: 16px;
  height: 16px;
  color: var(--brand-primary);
  flex-shrink: 0;
}

.pricing-footer-notes {
  text-align: center;
  max-width: 680px;
  margin: 36px auto 0 auto;
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* =========================================================
   AUDIENCE SECTION (Для кого)
   ========================================================= */
.audience-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.audience-card {
  flex: 0 1 calc(33.333% - 16px);
  min-width: 300px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.audience-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
}

.audience-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(91, 94, 244, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-primary);
  margin-bottom: 20px;
}

.audience-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.audience-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =========================================================
   FAQ SECTION (Частые вопросы)
   ========================================================= */
.faq-accordion {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--border-hover);
  background-color: var(--bg-card-hover);
}

.faq-trigger {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-base), color var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--brand-primary);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 26px;
}

.faq-item.active .faq-content {
  padding: 0 26px 24px 26px;
}

.faq-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* =========================================================
   FINAL CTA & FOOTER
   ========================================================= */
.cta-banner {
  background: linear-gradient(135deg, rgba(28, 35, 58, 0.9) 0%, rgba(14, 18, 30, 0.9) 100%);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 64px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 200px;
  background: radial-gradient(circle, rgba(91, 94, 244, 0.25) 0%, transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.cta-banner-title {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 14px;
}

.cta-banner-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px auto;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px 0;
  background-color: var(--bg-primary);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--brand-primary);
}

/* =========================================================
   BACK TO TOP (Magnetic with progress ring)
   ========================================================= */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: rgba(18, 23, 38, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px) scale(0.9);
  transition: opacity var(--transition-base), transform var(--transition-base), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  border-color: var(--brand-primary);
  box-shadow: 0 4px 20px rgba(91, 94, 244, 0.4);
  color: var(--brand-primary);
}

.progress-ring-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring-circle-bg {
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 2.5;
  fill: none;
}

.progress-ring-circle {
  stroke: var(--brand-primary);
  stroke-width: 2.5;
  stroke-linecap: round;
  fill: none;
  stroke-dasharray: 138.2;
  stroke-dashoffset: 138.2;
  transition: stroke-dashoffset 0.1s linear;
}

.back-to-top-icon {
  width: 18px;
  height: 18px;
  position: relative;
  z-index: 1;
}

/* =========================================================
   RESPONSIVE DESIGN (1920, 1440, 1280, 1024, 768, 360)
   ========================================================= */
@media (max-width: 1024px) {
  .feature-card {
    flex: 0 1 calc(50% - 12px);
  }
  .telegram-card {
    grid-template-columns: 1fr;
    padding: 36px 28px;
  }
  .hero-demo-card {
    position: static;
    margin: 20px auto 0 auto;
    width: 100%;
    max-width: 100%;
  }
}

@media (max-width: 860px) {
  .nav-desktop {
    display: none;
  }
  .mobile-toggle {
    display: flex;
  }
  .pricing-card {
    flex: 0 1 100%;
    max-width: 480px;
  }
  .audience-card {
    flex: 0 1 100%;
    max-width: 480px;
  }
  .feature-card {
    flex: 0 1 100%;
    max-width: 480px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
  }
  .section {
    padding: 72px 0;
  }
  .hero-section {
    padding-top: calc(var(--header-height) + 28px);
    padding-bottom: 56px;
  }
  .brand-name {
    font-size: 1.25rem;
  }
  .brand-mark {
    width: 32px;
    height: 32px;
  }
  .btn-cta, .btn-secondary {
    padding: 10px 18px;
    font-size: 0.875rem;
  }
  .demo-metrics-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .footer-layout {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .reveal-badge {
    bottom: 12px;
    left: 12px;
    padding: 6px 12px;
    font-size: 0.75rem;
  }
}

@media (max-width: 360px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn-cta,
  .hero-cta-group .btn-secondary {
    width: 100%;
  }
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .kinetic-char {
    transform: none !important;
    opacity: 1 !important;
  }
  .reveal-layer-evening {
    clip-path: circle(100% at 50% 50%) !important;
    opacity: 0.5;
  }
}