:root {
  --bg-deep: #050508;
  --bg-elevated: #0c0c12;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-strong: rgba(255, 255, 255, 0.1);
  --text-primary: #f4f4f5;
  --text-secondary: rgba(244, 244, 245, 0.65);
  --text-muted: rgba(244, 244, 245, 0.42);
  --card-text: #18181b;
  --card-text-muted: #52525b;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-bg-soft: rgba(250, 250, 252, 0.88);
  --accent: #6366f1;
  --accent-2: #8b5cf6;
  --accent-3: #22d3ee;
  --glow: rgba(99, 102, 241, 0.45);
  --glow-cyan: rgba(34, 211, 238, 0.35);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.12);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.24), 0 0 0 1px var(--glass-border);
  --shadow-card: 0 24px 80px rgba(0, 0, 0, 0.18), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
  --space-section: clamp(80px, 12vh, 140px);
  --space-block: clamp(24px, 4vw, 40px);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --nav-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body > main,
body > .calc-page {
  flex: 1 0 auto;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform;
}

.orb--1 {
  width: min(70vw, 600px);
  height: min(70vw, 600px);
  top: -15%;
  left: -10%;
  background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
  animation: float-1 18s var(--ease-out) infinite alternate;
}

.orb--2 {
  width: min(55vw, 480px);
  height: min(55vw, 480px);
  top: 40%;
  right: -15%;
  background: radial-gradient(circle, var(--glow-cyan) 0%, transparent 70%);
  animation: float-2 22s var(--ease-out) infinite alternate;
}

.orb--3 {
  width: min(40vw, 360px);
  height: min(40vw, 360px);
  bottom: 5%;
  left: 30%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);
  animation: float-3 20s var(--ease-out) infinite alternate;
}

.grid-mesh {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 20%, transparent 75%);
}

@keyframes float-1 {
  to { transform: translate(8%, 12%) scale(1.05); }
}
@keyframes float-2 {
  to { transform: translate(-10%, -8%) scale(1.08); }
}
@keyframes float-3 {
  to { transform: translate(6%, -10%) scale(0.95); }
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 clamp(16px, 4vw, 32px);
  transition: background 0.5s var(--ease-out), backdrop-filter 0.5s var(--ease-out), border-color 0.5s var(--ease-out);
}

.nav.is-scrolled {
  background: rgba(5, 5, 8, 0.72);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
}

.nav__inner {
  width: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.25s;
  flex-shrink: 0;
  max-width: min(100%, 320px);
}

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

.nav__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.nav__brand-text {
  line-height: 1.2;
}

@media (max-width: 768px) {
  .nav__logo {
    width: 28px;
    height: 28px;
  }
  .nav__brand {
    font-size: 11px;
    gap: 8px;
    max-width: 55vw;
  }
}

.nav__steps {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav__link {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 100px;
  border: 1px solid transparent;
  transition: color 0.25s, background 0.25s, border-color 0.25s;
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--text-primary);
  background: var(--glass);
  border-color: var(--glass-border);
}

main {
  position: relative;
  z-index: 1;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + 48px) clamp(20px, 5vw, 48px) 80px;
  position: relative;
}

.hero--compact {
  min-height: auto;
  padding: calc(var(--nav-h) + 64px) clamp(20px, 5vw, 48px) 48px;
}

.hero__panel {
  position: relative;
  max-width: 880px;
  width: 100%;
  padding: clamp(48px, 8vw, 80px) clamp(32px, 6vw, 72px);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  box-shadow: var(--shadow-glass);
  opacity: 0;
  transform: translateY(24px) scale(0.98);
  animation: reveal-scale 1.1s var(--ease-out) 0.25s forwards;
}

.hero__panel::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), rgba(255,255,255,0.02) 40%, rgba(99,102,241,0.15));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero__glow-svg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: auto;
  opacity: 0.5;
  pointer-events: none;
  z-index: -1;
}

.hero h1 {
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: clamp(20px, 3vh, 28px);
  background: linear-gradient(180deg, #fff 0%, rgba(255,255,255,0.75) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .subtitle {
  font-size: clamp(1.05rem, 2.5vw, 1.35rem);
  line-height: 1.65;
  font-weight: 400;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.hero__scroll {
  margin-top: clamp(48px, 8vh, 72px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  animation: reveal 0.8s var(--ease-out) 1s forwards;
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(180deg, var(--accent-3), transparent);
  border-radius: 2px;
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%, 100% { transform: scaleY(0.6); opacity: 0.4; }
  50% { transform: scaleY(1); opacity: 1; }
}

@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes reveal-scale {
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.stages {
  padding-top: clamp(24px, 4vh, 48px);
  padding-bottom: var(--space-section);
}

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(32px, 5vw, 48px);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 29px;
  top: 40px;
  bottom: 40px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), var(--accent-3), transparent);
  opacity: 0.35;
  border-radius: 2px;
}

@media (max-width: 640px) {
  .timeline::before { left: 23px; }
}

.stage {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(20px, 4vw, 32px);
  align-items: start;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.stage.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.stage__marker {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

.stage-number {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  background: linear-gradient(145deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.15) inset,
    0 8px 24px var(--glow),
    0 0 40px rgba(99, 102, 241, 0.25);
  transition: transform 0.4s var(--ease-spring), box-shadow 0.4s var(--ease-out);
}

.stage:hover .stage-number {
  transform: scale(1.06) rotate(-2deg);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.2) inset,
    0 12px 32px var(--glow),
    0 0 56px rgba(99, 102, 241, 0.35);
}

@media (max-width: 640px) {
  .stage-number {
    width: 46px;
    height: 46px;
    font-size: 18px;
    border-radius: 14px;
  }
}

.stage__body {
  position: relative;
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 44px);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out);
  overflow: hidden;
}

.stage__body::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle at 100% 0%, rgba(99, 102, 241, 0.08), transparent 70%);
  pointer-events: none;
}

.stage:hover .stage__body {
  transform: translateY(-4px);
  box-shadow:
    0 32px 96px rgba(0, 0, 0, 0.14),
    0 0 0 1px rgba(255, 255, 255, 0.6) inset;
}

.stage-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: clamp(24px, 4vw, 32px);
  padding-bottom: clamp(20px, 3vw, 28px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.stage-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--card-text);
  line-height: 1.2;
}

.stage__icon {
  margin-left: auto;
  flex-shrink: 0;
  opacity: 0.35;
  transition: opacity 0.3s, transform 0.4s var(--ease-spring);
}

.stage:hover .stage__icon {
  opacity: 0.55;
  transform: scale(1.05);
}

.stage__body ul {
  list-style: none;
  display: grid;
  gap: clamp(14px, 2.5vw, 20px);
}

.stage__body li {
  position: relative;
  padding: clamp(14px, 2.5vw, 18px) clamp(16px, 3vw, 22px) clamp(14px, 2.5vw, 18px) clamp(44px, 6vw, 52px);
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  line-height: 1.6;
  color: var(--card-text-muted);
  background: var(--card-bg-soft);
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: background 0.3s, border-color 0.3s, transform 0.35s var(--ease-out);
}

.stage__body li::before {
  content: '';
  position: absolute;
  left: clamp(16px, 3vw, 22px);
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  box-shadow: 0 0 10px var(--glow-cyan);
}

.stage__body li:hover {
  background: #fff;
  border-color: rgba(99, 102, 241, 0.12);
  transform: translateX(4px);
}

.footer {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  margin-top: auto;
  padding: clamp(40px, 6vh, 64px) clamp(20px, 5vw, 48px) clamp(32px, 5vh, 48px);
}

.footer__wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(28px, 4vw, 40px) clamp(24px, 4vw, 36px);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-glass);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
  margin-bottom: 14px;
}

.footer__brand:hover .footer__name {
  color: var(--accent-3);
}

.footer__logo {
  flex-shrink: 0;
  border-radius: 10px;
}

.footer__name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color 0.2s;
}

.footer__tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 2px;
}

.footer__about {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-secondary);
  max-width: 320px;
}

.footer__heading {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.footer__col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.footer__col a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer__col span {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

.footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 32px);
  padding-top: 20px;
  border-top: 1px solid var(--glass-border);
  font-size: 12px;
  color: var(--text-muted);
}

.footer__page {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.footer__page:empty {
  display: none;
}

/* Каталог */
.catalog {
  padding: 0 clamp(20px, 5vw, 48px) var(--space-section);
  max-width: 1120px;
  margin: 0 auto;
}

.search-bar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 48px);
  padding: clamp(24px, 4vw, 32px);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.search-bar__row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 14px 20px;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}

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

.search-input:focus {
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  font-size: 12px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 100px;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.chip:hover,
.chip.is-active {
  color: var(--text-primary);
  background: var(--glass);
  border-color: rgba(99, 102, 241, 0.35);
}

.search-meta {
  font-size: 13px;
  color: var(--text-muted);
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: clamp(20px, 3vw, 28px);
}

.catalog-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(24px, 4vw, 28px);
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.catalog-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 28px 72px rgba(0, 0, 0, 0.16);
}

.catalog-card__cat {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--card-text-muted);
}

.featured-wrap {
  margin-bottom: clamp(36px, 5vw, 52px);
}

.featured__title,
.catalog-heading {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: clamp(16px, 3vw, 24px);
}

.featured__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: clamp(20px, 3vw, 28px);
}

.catalog-heading {
  margin-top: clamp(8px, 2vw, 16px);
}

.catalog-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.catalog-card__desc {
  font-size: 14px;
  line-height: 1.55;
  color: var(--card-text-muted);
  flex: 1;
}

.catalog-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.catalog-card__tag {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--card-bg-soft);
  color: var(--card-text-muted);
}

.catalog-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 15px;
}

/* См. также */
.article-related {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: clamp(32px, 5vw, 48px) clamp(20px, 5vw, 48px) 0;
}

.article-related__title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.article-related__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.article-related__list a {
  display: inline-block;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 100px;
  transition: background 0.25s, border-color 0.25s, transform 0.25s;
}

.article-related__list a:hover {
  background: var(--surface-hover);
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-2px);
}

.nav__tools {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* Калькулятор маршрута */
.calc-page {
  position: relative;
  z-index: 1;
  max-width: 1120px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 32px) clamp(20px, 5vw, 48px) var(--space-section);
}

.calc-panel {
  padding: clamp(28px, 5vw, 40px);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  margin-bottom: 28px;
}

.calc-panel__title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.calc-panel__desc {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.55;
}

.calc-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.calc-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 640px) {
  .calc-row { grid-template-columns: 1fr; }
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

.calc-field label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.calc-input {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.calc-input:focus {
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.calc-suggest {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  margin-top: 4px;
  z-index: 50;
  max-height: 220px;
  overflow-y: auto;
  background: #12121a;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-glass);
  display: none;
}

.calc-suggest.is-open {
  display: block;
}

.calc-suggest__item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.calc-suggest__item:hover,
.calc-suggest__item.is-active {
  background: var(--glass);
}

.calc-suggest__meta {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.calc-waypoints {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-waypoint-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.calc-waypoint-row .calc-field {
  flex: 1;
}

.calc-btn {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 100px;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background 0.25s, transform 0.2s;
}

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

.calc-btn--ghost:hover {
  background: var(--glass);
  color: var(--text-primary);
}

.calc-btn--primary {
  color: #fff;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  border-color: transparent;
  align-self: flex-start;
  padding: 14px 28px;
}

.calc-btn--primary:hover {
  transform: translateY(-2px);
}

.calc-btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.calc-btn--icon {
  padding: 12px 14px;
  flex-shrink: 0;
  margin-top: 26px;
}

.calc-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 8px;
}

.calc-option {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.18);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calc-switch {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.calc-switch__input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.calc-switch__box {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: 7px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.28);
  position: relative;
  transition: background 0.25s var(--ease-out), border-color 0.25s, box-shadow 0.25s, transform 0.2s var(--ease-spring);
}

.calc-switch__box::after {
  content: '';
  position: absolute;
  left: 7px;
  top: 3px;
  width: 6px;
  height: 11px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: transform 0.2s var(--ease-spring);
}

.calc-switch__input:checked + .calc-switch__box {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.22);
}

.calc-switch__input:checked + .calc-switch__box::after {
  transform: rotate(45deg) scale(1);
}

.calc-switch__input:focus-visible + .calc-switch__box {
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35);
}

.calc-switch:hover .calc-switch__box {
  border-color: rgba(99, 102, 241, 0.45);
}

.calc-switch__label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.35;
}

.calc-option__field {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 34px;
  transition: opacity 0.25s;
}

.calc-option__field.is-disabled {
  opacity: 0.4;
  pointer-events: none;
}

.calc-option__field-label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

.calc-option__input {
  width: 80px;
  padding: 8px 10px;
  font-family: var(--font);
  font-size: 14px;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.calc-option__input:focus {
  outline: none;
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.calc-option__input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.calc-results {
  display: none;
}

.calc-results.is-visible {
  display: block;
}

.calc-results__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.calc-metric {
  padding: 20px 22px;
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.calc-metric__label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--card-text-muted);
  margin-bottom: 8px;
}

.calc-metric__value {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.calc-metric__hint {
  font-size: 12px;
  color: var(--card-text-muted);
  margin-top: 6px;
}

.calc-map-wrap {
  display: none;
  margin-bottom: 24px;
}

.calc-results.is-visible .calc-map-wrap {
  display: block;
}

.calc-map__title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.calc-map {
  height: 420px;
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.2);
  z-index: 0;
}

.calc-map .leaflet-control-attribution {
  font-size: 10px;
}

.calc-breakdown {
  padding: 22px;
  background: var(--card-bg);
  color: var(--card-text);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.calc-breakdown h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}

.calc-breakdown ul {
  list-style: none;
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--card-text-muted);
  line-height: 1.5;
}

.calc-error {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  font-size: 14px;
  margin-top: 16px;
  display: none;
}

.calc-error.is-visible {
  display: block;
}

.calc-loading {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 12px;
  display: none;
}

.calc-loading.is-visible {
  display: block;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .stage, .hero__panel, .hero__scroll {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 768px) {
  .nav__steps { display: none; }
  .timeline::before { display: none; }
  .stage { grid-template-columns: 1fr; }
  .stage__marker {
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .stage-header { flex-wrap: wrap; }
  .stage__icon {
    margin-left: 0;
    order: 3;
    width: 100%;
  }
}