/* ===== VARIABLES ===== */
:root {
  --clr-bg: #0f1923;
  --clr-bg-light: #162130;
  --clr-bg-card: #1c2b3a;
  --clr-accent: #ff6b00;
  --clr-accent-hover: #ff8a33;
  --clr-text: #e4e8ec;
  --clr-text-muted: #8a9bb0;
  --clr-white: #ffffff;
  --clr-border: rgba(255, 255, 255, 0.08);
  --clr-tg: #2aabee;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  --transition: 0.3s ease;
  --max-w: 1120px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ===== UTILITIES ===== */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 48px;
  color: var(--clr-white);
}

.section__title--light {
  color: var(--clr-white);
}

/* ===== BUTTON ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-white);
  background: var(--clr-accent);
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn:hover {
  background: var(--clr-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 0, 0.35);
}

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

.btn--large {
  padding: 18px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius);
}

.btn--small {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn--tg {
  background: var(--clr-tg);
}

.btn--tg:hover {
  background: #3bbef5;
  box-shadow: 0 6px 20px rgba(42, 171, 238, 0.35);
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 25, 35, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.header__logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--clr-white);
  letter-spacing: -0.02em;
}

.header__logo::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--clr-accent);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}

.header__nav {
  display: flex;
  gap: 28px;
}

.header__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}

.header__link:hover {
  color: var(--clr-white);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__tg {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--clr-tg);
  transition: background var(--transition), color var(--transition);
}

.header__tg:hover {
  background: rgba(42, 171, 238, 0.15);
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

.burger span {
  display: block;
  height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger.active span:nth-child(2) {
  opacity: 0;
}

.burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(160deg, #0f1923 0%, #1a2d42 50%, #0f1923 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 107, 0, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(42, 171, 238, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__title {
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--clr-white);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero__accent {
  color: var(--clr-accent);
}

.hero__subtitle {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--clr-text-muted);
  margin-bottom: 36px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  margin-bottom: 48px;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--clr-border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.hero__badge svg {
  color: var(--clr-accent);
  flex-shrink: 0;
}

/* ===== ADVANTAGES ===== */
.advantages {
  padding: 96px 0;
}

.advantages__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.advantage-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 107, 0, 0.3);
}

.advantage-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 107, 0, 0.1);
  border-radius: 16px;
  color: var(--clr-accent);
}

.advantage-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 8px;
}

.advantage-card__text {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
}

/* ===== STEPS ===== */
.steps {
  padding: 96px 0;
  background: var(--clr-bg-light);
}

.steps__timeline {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
}

.steps__timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-accent), rgba(255, 107, 0, 0.1));
}

.step {
  display: flex;
  gap: 24px;
  padding-bottom: 40px;
  position: relative;
}

.step:last-child {
  padding-bottom: 0;
}

.step__number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-accent);
  color: var(--clr-white);
  font-size: 1.2rem;
  font-weight: 700;
  border-radius: 50%;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--clr-bg-light);
}

.step__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 4px;
}

.step__text {
  font-size: 0.95rem;
  color: var(--clr-text-muted);
}

.steps__cta {
  text-align: center;
  margin-top: 48px;
}

/* ===== CASES ===== */
.cases {
  padding: 96px 0;
}

.cases__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
}

.case-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 107, 0, 0.3);
}

/* ===== GALLERY ===== */
.case-card__gallery {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--clr-border);
}

.gallery__track {
  display: flex;
  transition: transform 0.4s ease;
}

.gallery__track img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  flex-shrink: 0;
}

.gallery__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  z-index: 2;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition);
}

.case-card:hover .gallery__btn,
.case-card__gallery:focus-within .gallery__btn {
  opacity: 1;
}

.gallery__btn:hover {
  background: rgba(255, 107, 0, 0.8);
}

.gallery__btn--prev {
  left: 8px;
}

.gallery__btn--next {
  right: 8px;
}

.gallery__dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}

.gallery__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: background var(--transition), transform var(--transition);
}

.gallery__dot.active {
  background: var(--clr-accent);
  transform: scale(1.25);
}

.case-card__body {
  padding: 24px;
}

.case-card__name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 4px;
}

.case-card__specs {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  margin-bottom: 16px;
}

.case-card__prices {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.case-card__price-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.case-card__label {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}

.case-card__value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text);
}

.case-card__price-row--total {
  padding-top: 8px;
  border-top: 1px solid var(--clr-border);
}

.case-card__price-row--total .case-card__value {
  color: var(--clr-accent);
  font-size: 1.1rem;
  font-weight: 700;
}

/* ===== FAQ ===== */
.faq {
  padding: 96px 0;
  background: var(--clr-bg-light);
}

.faq__list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq__item {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq__item.active {
  border-color: rgba(255, 107, 0, 0.3);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-white);
  transition: color var(--transition);
}

.faq__question:hover {
  color: var(--clr-accent);
}

.faq__arrow {
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq__item.active .faq__arrow {
  transform: rotate(180deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq__answer p {
  padding: 0 24px 20px;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
}

/* ===== FORM SECTION ===== */
.form-section {
  padding: 96px 0;
  background: linear-gradient(160deg, #1a2d42, #0f1923);
}

.form-section__subtitle {
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 1.1rem;
  margin-top: -32px;
  margin-bottom: 40px;
}

.form {
  max-width: 480px;
  margin: 0 auto;
}

.form__fields {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.form__input {
  width: 100%;
  padding: 16px 20px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--clr-white);
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form__input::placeholder {
  color: var(--clr-text-muted);
}

.form__input:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.15);
}

.form__input.error {
  border-color: #ff4444;
  box-shadow: 0 0 0 3px rgba(255, 68, 68, 0.15);
}

.form__submit {
  width: 100%;
}

.form__disclaimer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-top: 16px;
}

.form__disclaimer a {
  color: var(--clr-text-muted);
  text-decoration: underline;
  transition: color var(--transition);
}

.form__disclaimer a:hover {
  color: var(--clr-white);
}

/* ===== FOOTER ===== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--clr-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-white);
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-top: 4px;
}

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

.footer__phone {
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-text);
  transition: color var(--transition);
}

.footer__phone:hover {
  color: var(--clr-accent);
}

/* ===== FIXED TELEGRAM BUTTON ===== */
.tg-float {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 999;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-tg);
  color: var(--clr-white);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(42, 171, 238, 0.4);
  transition: transform var(--transition), box-shadow var(--transition);
}

.tg-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 28px rgba(42, 171, 238, 0.5);
}

/* ===== REVEAL ANIMATION ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .advantages__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header__nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: rgba(15, 25, 35, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--clr-border);
    padding: 16px 0;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--transition), opacity var(--transition);
    pointer-events: none;
  }

  .header__nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .header__link {
    display: block;
    padding: 12px 20px;
    font-size: 1rem;
    width: 100%;
    text-align: center;
  }

  .header__cta {
    display: none;
  }

  .burger {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero__title {
    font-size: clamp(1.75rem, 6vw, 2.5rem);
  }

  .hero__badges {
    flex-direction: column;
    align-items: center;
  }

  .advantages__grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .advantage-card {
    text-align: left;
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
  }

  .advantage-card__icon {
    margin: 0;
    flex-shrink: 0;
    width: 52px;
    height: 52px;
  }

  .cases__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .gallery__btn {
    opacity: 1;
  }

  .footer__inner {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer__contacts {
    flex-direction: column;
  }

  .section__title {
    margin-bottom: 36px;
  }

  .steps__timeline::before {
    left: 24px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 110px 0 48px;
  }

  .hero__badge {
    font-size: 0.8rem;
    padding: 8px 14px;
  }

  .advantages,
  .steps,
  .cases,
  .faq,
  .form-section {
    padding: 64px 0;
  }

  .case-card__img {
    height: 160px;
  }

  .btn--large {
    padding: 16px 28px;
    font-size: 1rem;
  }

  .tg-float {
    bottom: 20px;
    right: 20px;
    width: 52px;
    height: 52px;
  }
}