/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', sans-serif;
  color: #1a1a2e;
  background: #fff;
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }

/* ===== VARIABLES ===== */
:root {
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-light: #eff6ff;
  --dark: #0f172a;
  --dark2: #1e293b;
  --grey: #f8fafc;
  --grey2: #e2e8f0;
  --text: #334155;
  --text-light: #64748b;
  --white: #ffffff;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.12);
}

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }
.section--dark { background: var(--dark); }
.section--grey { background: var(--grey); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,0.35); }

.btn--ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}
.btn--ghost:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

.btn--header {
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  font-size: 14px;
}
.btn--header:hover { background: var(--accent-dark); }

.btn--lg { padding: 16px 32px; font-size: 16px; }
.btn--full { width: 100%; }

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grey2);
  transition: box-shadow 0.3s;
}
.header.scrolled { box-shadow: var(--shadow); }

.header__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 72px;
}

.logo { font-size: 22px; font-weight: 800; letter-spacing: -0.5px; }
.logo__car { color: var(--accent); }
.logo__summit { color: var(--dark); }
.logo__biz { color: var(--text-light); font-weight: 400; font-size: 18px; }

/* ===== LANGUAGE SWITCHER ===== */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.lang-btn {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.2s;
  padding: 2px 0;
}
a.lang-btn:hover { color: var(--accent); }
.lang-active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0;
}
.lang-sep { color: var(--grey2); font-size: 12px; }

.nav { display: flex; gap: 28px; margin-left: auto; }
.nav a { font-size: 15px; font-weight: 500; color: var(--text); transition: color 0.2s; }
.nav a:hover { color: var(--accent); }

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

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
  z-index: 0;
}

.hero__bg::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.3) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__bg::after {
  content: '';
  position: absolute;
  bottom: -100px; left: 20%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding: 80px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-block;
  background: rgba(37,99,235,0.2);
  border: 1px solid rgba(37,99,235,0.4);
  color: #93c5fd;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
}

.accent { color: #60a5fa; }

.hero__sub {
  font-size: 18px;
  color: rgba(255,255,255,0.7);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 64px; }

.hero__stats {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat__num {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.stat__label {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
}

.stat__divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.15);
}

/* ===== SECTION HEAD ===== */
.section__head {
  text-align: center;
  margin-bottom: 64px;
}

.section__tag {
  display: inline-block;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section__tag--light { color: #60a5fa; }

.section__title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section__title--light { color: #fff; }

.section__sub { color: var(--text-light); font-size: 17px; }

/* ===== CARDS / SERVICES ===== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--grey2);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card--accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.card--accent .card__text,
.card--accent .card__list li { color: rgba(255,255,255,0.85); }

.card--cta {
  background: var(--dark);
  border-color: var(--dark);
  color: #fff;
}

.card--cta .card__text { color: rgba(255,255,255,0.7); }

.card__icon { font-size: 32px; }

.card__title { font-size: 18px; font-weight: 700; }

.card__text { font-size: 14px; color: var(--text); line-height: 1.6; flex: 1; }

.card__list { margin-top: 4px; }
.card__list li {
  font-size: 13px;
  color: var(--text-light);
  padding: 4px 0;
  border-top: 1px solid var(--grey2);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card--accent .card__list li { border-color: rgba(255,255,255,0.2); }
.card__list li::before { content: '✓'; color: var(--accent); font-weight: 700; font-size: 12px; }
.card--accent .card__list li::before { color: #fff; }

/* ===== WHY ===== */
.why__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px 64px;
}

.why__num {
  font-size: 48px;
  font-weight: 800;
  color: rgba(255,255,255,0.08);
  line-height: 1;
  margin-bottom: 12px;
}

.why__title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.why__text { color: rgba(255,255,255,0.6); font-size: 15px; line-height: 1.7; }

/* ===== CASES ===== */
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case {
  background: #fff;
  border: 1px solid var(--grey2);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
}

.case:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: var(--accent); }

.case__tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.case__title { font-size: 17px; font-weight: 700; margin-bottom: 10px; }

.case__text { color: var(--text-light); font-size: 14px; line-height: 1.6; margin-bottom: 24px; }

.case__result {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--grey2);
}

.case__num {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
  white-space: nowrap;
}

.case__desc { font-size: 13px; color: var(--text-light); line-height: 1.4; }

/* ===== STEPS ===== */
.steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.step {
  flex: 1;
  background: #fff;
  border: 1px solid var(--grey2);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.step__num {
  width: 40px; height: 40px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 16px;
}

.step__title { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.step__text { font-size: 13px; color: var(--text-light); line-height: 1.6; }

.step__arrow {
  color: var(--text-light);
  font-size: 20px;
  margin-top: 32px;
  flex-shrink: 0;
}

/* ===== CONTACT ===== */
.contact__wrap {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.contact__text {
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  margin: 24px 0 32px;
}

.contact__info { display: flex; flex-direction: column; gap: 16px; }

.contact__item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 500;
}

.contact__item a:hover { color: var(--accent); }
.contact__icon { font-size: 20px; }

/* ===== FORM ===== */
.form {
  background: var(--grey);
  border: 1px solid var(--grey2);
  border-radius: var(--radius);
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

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

.form__label { font-size: 13px; font-weight: 600; color: var(--dark); }

.form__input, .form__textarea, select.form__input {
  border: 1.5px solid var(--grey2);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 15px;
  font-family: inherit;
  color: var(--dark);
  background: #fff;
  transition: border-color 0.2s;
  outline: none;
  width: 100%;
  -webkit-appearance: none;
}

.form__input:focus, .form__textarea:focus, select.form__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form__textarea { min-height: 120px; resize: vertical; }

.form__note { font-size: 12px; color: var(--text-light); text-align: center; }

/* ===== FOOTER ===== */
.footer {
  background: var(--dark);
  padding: 40px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.footer .logo__summit { color: #fff; }

.footer__links {
  display: flex;
  gap: 24px;
  margin-left: auto;
}

.footer__links a {
  color: rgba(255,255,255,0.5);
  font-size: 14px;
  transition: color 0.2s;
}
.footer__links a:hover { color: #fff; }

.footer__copy { color: rgba(255,255,255,0.3); font-size: 13px; }

/* ===== MODAL ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
}

.modal.open { display: flex; }

.modal__box {
  background: #fff;
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  animation: popIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes popIn {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.modal__icon { font-size: 48px; margin-bottom: 16px; }
.modal__title { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.modal__text { color: var(--text-light); margin-bottom: 24px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .why__grid { grid-template-columns: 1fr; gap: 32px; }
  .contact__wrap { grid-template-columns: 1fr; gap: 48px; }
  .steps { flex-wrap: wrap; }
  .step { flex: 1 1 calc(50% - 48px); }
  .step__arrow { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav, .btn--header { display: none; }
  .burger { display: flex; }

  .nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: #fff;
    padding: 24px;
    border-bottom: 1px solid var(--grey2);
    gap: 16px;
    box-shadow: var(--shadow);
  }

  .services__grid { grid-template-columns: 1fr; }
  .cases__grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .hero__stats { gap: 20px; }
  .stat__divider { display: none; }

  .footer__inner { flex-direction: column; gap: 16px; text-align: center; }
  .footer__links { margin-left: 0; }

  .step { flex: 1 1 100%; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .btn--lg { width: 100%; text-align: center; }
  .form { padding: 24px 20px; }
}