/* ============================================================
   KDANCE — Design System
   Apple-inspired minimalist: white, black, clean typography
   ============================================================ */

/* ---- Tokens ---- */
:root {
  --white: #ffffff;
  --black: #000000;
  --gray-50: #fafafa;
  --gray-100: #f5f5f7;
  --gray-200: #e8e8ed;
  --gray-300: #d2d2d7;
  --gray-400: #aeaeb2;
  --gray-500: #86868b;
  --gray-600: #6e6e73;
  --gray-700: #48484a;
  --gray-800: #2c2c2e;
  --gray-900: #1d1d1f;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration: 0.5s;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ---- Container ---- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
}

.nav--scrolled {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: 0 0.5px 0 rgba(0, 0, 0, 0.08);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--gray-900);
  transition: opacity 0.2s;
}

.nav__logo:hover {
  opacity: 0.7;
}

.nav__links {
  display: flex;
  gap: 32px;
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: color 0.2s;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--gray-900);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s var(--ease);
}

.nav__link:hover {
  color: var(--gray-900);
}

.nav__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Burger */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav__burger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--gray-900);
  border-radius: 1px;
  transition: all 0.3s var(--ease);
}

.nav__burger.active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.nav__burger.active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

/* Subtle grid bg */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero__inner {
  position: relative;
  max-width: 680px;
}

.hero__label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 16px;
  animation: fadeUp 0.8s var(--ease-out) both;
}

.hero__title {
  font-size: clamp(3.5rem, 10vw, 6.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--gray-900);
  margin-bottom: 24px;
  animation: fadeUp 0.8s var(--ease-out) 0.1s both;
}

.hero__subtitle {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--gray-600);
  max-width: 500px;
  margin: 0 auto 40px;
  font-weight: 400;
  animation: fadeUp 0.8s var(--ease-out) 0.2s both;
}

.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  animation: fadeUp 0.8s var(--ease-out) 0.3s both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 980px;
  border: none;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  text-align: center;
}

.btn--primary {
  background: var(--gray-900);
  color: var(--white);
}

.btn--primary:hover {
  background: var(--black);
  transform: scale(1.03);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn--primary:active {
  transform: scale(0.98);
}

.btn--ghost {
  background: transparent;
  color: var(--gray-900);
  border: 1.5px solid var(--gray-300);
}

.btn--ghost:hover {
  border-color: var(--gray-900);
  transform: scale(1.03);
}

.btn--outline {
  background: transparent;
  color: var(--gray-900);
  border: 1.5px solid var(--gray-300);
}

.btn--outline:hover {
  border-color: var(--gray-900);
  background: var(--gray-900);
  color: var(--white);
}

.btn--full {
  width: 100%;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: 100px 0;
}

.section--alt {
  background: var(--gray-50);
}

.section__label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
  text-align: center;
  margin-bottom: 12px;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  text-align: center;
  color: var(--gray-900);
  margin-bottom: 56px;
  line-height: 1.2;
}

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

.about__card {
  padding: 36px 28px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all 0.4s var(--ease);
  opacity: 0;
  transform: translateY(24px);
}

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

.about__card:hover {
  border-color: var(--gray-300);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.about__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  color: var(--gray-900);
}

.about__card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.about__card-text {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ============================================================
   CLASSES
   ============================================================ */
.classes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.class-card {
  padding: 32px 28px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all 0.4s var(--ease);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(24px);
}

.class-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.class-card:hover {
  border-color: var(--gray-900);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.class-card__number {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-400);
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.class-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.class-card__text {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.6;
  flex: 1;
}

.class-card__tag {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 6px 12px;
  border-radius: 980px;
  align-self: flex-start;
}

/* ============================================================
   PRICING
   ============================================================ */
.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.price-card {
  padding: 36px 28px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all 0.4s var(--ease);
  position: relative;
  opacity: 0;
  transform: translateY(24px);
}

.price-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.price-card:hover {
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.price-card--featured {
  border-color: var(--gray-900);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.price-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gray-900);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 16px;
  border-radius: 980px;
}

.price-card__header {
  margin-bottom: 24px;
}

.price-card__name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.price-card__desc {
  font-size: 0.85rem;
  color: var(--gray-500);
}

.price-card__price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}

.price-card__amount {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}

.price-card__currency {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-500);
}

.price-card__features {
  margin-bottom: 28px;
}

.price-card__features li {
  padding: 8px 0;
  font-size: 0.875rem;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-card__features li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--gray-900);
  border-radius: 50%;
  flex-shrink: 0;
}

.price-card__features li:last-child {
  border-bottom: none;
}

.pricing__note {
  text-align: center;
  margin-top: 40px;
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* ============================================================
   SCHEDULE
   ============================================================ */
.schedule__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
}

.schedule__table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.schedule__table th,
.schedule__table td {
  padding: 14px 18px;
  text-align: left;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--gray-100);
}

.schedule__table th {
  font-weight: 600;
  color: var(--gray-500);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--gray-50);
}

.schedule__table th:first-child {
  border-top-left-radius: var(--radius-lg);
}

.schedule__table th:last-child {
  border-top-right-radius: var(--radius-lg);
}

.schedule__table tbody tr:last-child td {
  border-bottom: none;
}

.schedule__table tbody tr:hover {
  background: var(--gray-50);
}

.schedule__time {
  font-weight: 600;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
}

.schedule__table td {
  color: var(--gray-700);
}

.schedule__note {
  text-align: center;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--gray-500);
}

/* ============================================================
   CONTACTS
   ============================================================ */
.contacts__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 700px;
  margin: 0 auto;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: all 0.3s var(--ease);
  opacity: 0;
  transform: translateY(16px);
}

.contact-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.contact-item:hover {
  border-color: var(--gray-300);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.contact-item__icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  color: var(--gray-900);
}

.contact-item__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.contact-item__value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-900);
  transition: color 0.2s;
}

a.contact-item__value:hover {
  color: var(--gray-600);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 48px 0 32px;
  background: var(--gray-900);
  color: var(--white);
}

.footer__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.footer__logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--white);
}

.footer__tagline {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 4px;
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--gray-400);
  transition: color 0.2s;
}

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

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

.footer__social {
  display: flex;
  gap: 12px;
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--gray-400);
  transition: all 0.25s var(--ease);
}

.footer__social-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--white);
  transform: translateY(-2px);
}

.footer__divider {
  height: 1px;
  background: var(--gray-800);
  margin: 32px 0;
}

.footer__bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.footer__legal p {
  font-size: 0.8rem;
  color: var(--gray-500);
  line-height: 1.7;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--gray-600);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .about__grid,
  .classes__grid,
  .pricing__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease);
  }

  .nav__links.open {
    opacity: 1;
    visibility: visible;
  }

  .nav__links .nav__link {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
  }

  .nav__burger {
    display: flex;
    z-index: 101;
  }

  .hero {
    padding: 100px 24px 60px;
    min-height: auto;
  }

  .hero__title {
    font-size: clamp(2.5rem, 12vw, 4rem);
  }

  .section {
    padding: 72px 0;
  }

  .about__grid,
  .classes__grid,
  .pricing__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .contacts__grid {
    grid-template-columns: 1fr;
  }

  .footer__top {
    flex-direction: column;
    gap: 24px;
  }

  .footer__links {
    flex-direction: column;
    gap: 12px;
  }

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

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    gap: 10px;
  }

  .btn {
    padding: 14px 24px;
  }
}

/* ============================================================
   LEGAL PAGE STYLES (offer.html, privacy.html)
   ============================================================ */
.legal {
  max-width: 740px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.legal__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-500);
  margin-bottom: 40px;
  transition: color 0.2s;
}

.legal__back:hover {
  color: var(--gray-900);
}

.legal h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.legal__date {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-bottom: 48px;
}

.legal h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.legal h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 12px;
}

.legal p {
  font-size: 0.9375rem;
  color: var(--gray-700);
  line-height: 1.75;
  margin-bottom: 16px;
}

.legal ul,
.legal ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.legal li {
  font-size: 0.9375rem;
  color: var(--gray-700);
  line-height: 1.75;
  margin-bottom: 6px;
  list-style: disc;
}

.legal ol li {
  list-style: decimal;
}