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

:root {
  --bg: #f5f7fb;           /* фон страницы */
  --bg-alt: #ffffff;       /* фон «альтернативных» секций */
  --card: #ffffff;         /* фон карточек */
  --accent: #2563eb;       /* синий акцент */
  --accent-soft: rgba(37, 99, 235, 0.1);
  --text: #111827;         /* основной текст (тёмно-серый) */
  --muted: #6b7280;        /* вторичный текст */
  --border: #e5e7eb;       /* светлые бордеры */
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.12);
  --shadow-subtle: 0 10px 24px rgba(15, 23, 42, 0.08);
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.22s ease-out;
}


html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
}


a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* HEADER */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 8, 16, 0.96), rgba(5, 8, 16, 0.85), transparent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-mark {
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 14px;
}

.logo-tagline {
  font-size: 11px;
  color: var(--muted);
}

.main-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.main-nav a {
  padding: 6px 0;
  color: var(--muted);
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 999px;
  transition: width var(--transition-fast);
}

.main-nav a:hover {
  color: var(--text);
}

.main-nav a:hover::after {
  width: 100%;
}

.header-cta {
  display: flex;
  align-items: center;
}

/* BUTTONS */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #35b0ff, #4de0ff);
  color: #050810;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), opacity var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
  opacity: 0.95;
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-subtle);
  opacity: 0.9;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: none;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
}

.btn-small {
  padding: 7px 14px;
  font-size: 13px;
}

.btn-full {
  width: 100%;
}

/* SECTIONS */

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}


.section h2 {
  font-size: 28px;
  margin: 0 0 18px;
}

.section-intro {
  max-width: 640px;
  color: var(--muted);
  margin-bottom: 32px;
}

/* HERO */

.hero-section {
  padding-top: 96px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 32px;
  align-items: stretch;
}

.hero-text h1 {
  font-size: 34px;
  line-height: 1.15;
  margin: 0 0 14px;
}

.hero-subtitle {
  margin: 0 0 20px;
  color: var(--muted);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.hero-note {
  color: var(--muted);
  font-size: 13px;
}

.hero-card {
  background: radial-gradient(circle at top left, rgba(53, 176, 255, 0.12), transparent 55%),
    var(--card);
  border-radius: 22px;
  padding: 22px 20px 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-title {
  font-size: 18px;
  margin: 0 0 4px;
}

.card-subtitle {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--muted);
}

/* MINI CALC */

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

.mini-calc label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
}

input[type="number"] {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(3, 7, 18, 0.7);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast);
}

input[type="number"]::placeholder {
  color: #5c6475;
}

input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  background: rgba(3, 7, 18, 0.95);
}

.mini-result {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
  border: 1px dashed rgba(255, 255, 255, 0.12);
  font-size: 14px;
}

.mini-hint {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--muted);
}

/* FEATURES */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.feature {
  background: var(--card);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow-subtle);
}

.feature h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.feature p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* SOLUTION */

.solution-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 28px;
  align-items: flex-start;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}

.checklist li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--muted);
}

.checklist li::before {
  content: "•";
  position: absolute;
  left: 5px;
  top: 0;
  color: var(--accent);
}

.solution-card {
  background: radial-gradient(circle at top right, rgba(53, 176, 255, 0.16), transparent 60%),
    rgba(7, 12, 24, 0.96);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
}

.solution-card h3 {
  margin: 0 0 10px;
}

.feel-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.feel-list li {
  margin-bottom: 8px;
}

/* CALCULATOR */

.calc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.calc-form {
  background: var(--card);;
  border-radius: var(--radius-lg);
  padding: 20px 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.calc-form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
}

.calc-result {
  background: radial-gradient(circle at top, rgba(53, 176, 255, 0.15), transparent 55%),
    rgba(7, 12, 24, 0.96);
  border-radius: var(--radius-lg);
  padding: 20px 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.calc-result h3 {
  margin: 0;
}

.calc-placeholder {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.calc-number {
  font-size: 26px;
  font-weight: 600;
}

.calc-subtext {
  font-size: 13px;
  color: var(--muted);
}

.calc-disclaimer {
  margin-top: 16px;
  font-size: 12px;
  color: var(--muted);
}

/* PILOT */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.step {
  background: var(--card);;
  border-radius: var(--radius-md);
  padding: 16px 14px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow-subtle);
}

.step-number {
  width: 26px;
  height: 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent);
}

.step h3 {
  font-size: 15px;
  margin: 0 0 6px;
}

.step p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* CASES */

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.case-card {
  background: var(--card);;
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-subtle);
}

.case-card h3 {
  margin: 0 0 6px;
}

.case-label {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
}

.case-card p {
  font-size: 14px;
  color: var(--muted);
}

.case-card ul {
  margin: 8px 0 0;
  padding-left: 18px;
  font-size: 13px;
}

/* FAQ */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

details {
  background: var(--card);;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: 10px 12px;
  box-shadow: var(--shadow-subtle);
}

summary {
  cursor: pointer;
  font-size: 14px;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

details[open] summary {
  color: var(--accent);
}

details p {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* CONTACTS */

.contacts-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  align-items: flex-start;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.contact-link {
  display: flex;
  flex-direction: column;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: var(--card);;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-subtle);
  font-size: 14px;
}

.contact-link:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

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

.contact-value {
  margin-top: 4px;
}

.contacts-note {
  background: var(--card);;
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-subtle);
  font-size: 14px;
}

.contacts-note ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

/* FOOTER */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 18px 0 22px;
  background: #ffffff;
}


.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 12px;
}

/* RESPONSIVE */

@media (max-width: 960px) {
  .hero-grid,
  .solution-grid,
  .calc-grid,
  .steps-grid,
  .cases-grid,
  .contacts-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-section {
    padding-top: 80px;
  }

  .site-header {
    position: static;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 10px;
  }

  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 56px 0;
  }

  .hero-text h1 {
    font-size: 26px;
  }

  .features-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .steps-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ==== Светлая тема: доп. правки блоков ==== */

/* Карточка "Как это ощущается для сотрудника" */
.solution-card {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-subtle);
}

/* Левая форма и правая карточка "Результат расчёта" */
.calc-form,
.calc-result {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-subtle);
}

/* Мини-калькулятор в первом экране */
.hero-card {
  background: var(--card);
  border: 1px solid var(--border);
}

/* Поля, куда человек вбивает цифры */
input[type="number"] {
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text);
}

input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  background: #ffffff;
}

/* Блок с результатом мини-калькулятора */
.mini-result {
  background: #f3f4f6;
  border: 1px dashed var(--border);
  color: var(--text);
}

/* ==== Светлый хедер с синеватым градиентом ==== */
.site-header {
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.96),
    rgba(226, 238, 255, 0.92),
    rgba(248, 250, 252, 0.4)
  );
  border-bottom: 1px solid var(--border);
}