/* ===== variables ===== */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-success: #10b981;
  --color-text: #1f2937;
  --color-text-light: #4b5563;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --radius: 0.5rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

/* ===== reset & base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  font-size: 16px;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ===== accessibility ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== header & burger ===== */
.header {
  background-color: var(--color-bg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.burger-toggle {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.burger-icon {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  z-index: 110;
}

.burger-icon span {
  display: block;
  height: 3px;
  background: var(--color-text);
  border-radius: 3px;
  transition: all 0.2s;
}

.nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background: var(--color-bg);
  box-shadow: -2px 0 10px rgba(0,0,0,0.1);
  transition: right 0.3s ease;
  padding: var(--spacing-xl) var(--spacing-md);
  z-index: 200;
}

.burger-toggle:checked ~ .nav {
  right: 0;
}

.burger-toggle:checked ~ .burger-icon span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.burger-toggle:checked ~ .burger-icon span:nth-child(2) {
  opacity: 0;
}
.burger-toggle:checked ~ .burger-icon span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  z-index: 150;
  display: none;
}

.burger-toggle:checked ~ .overlay {
  display: block;
}

.nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.nav__link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.1rem;
  padding: 0.5rem 0;
  display: block;
  border-bottom: 1px solid var(--color-border);
}

.nav__link:hover,
.nav__link:focus {
  color: var(--color-primary);
}

/* desktop menu */
@media (min-width: 768px) {
  .burger-icon,
  .overlay {
    display: none !important;
  }

  .nav {
    position: static;
    width: auto;
    height: auto;
    box-shadow: none;
    padding: 0;
    background: transparent;
  }

  .nav__list {
    flex-direction: row;
    gap: var(--spacing-md);
  }

  .nav__link {
    border-bottom: none;
    padding: 0;
    font-size: 1rem;
  }
}

/* ===== hero ===== */
.hero {
  background: linear-gradient(145deg, var(--color-bg-alt) 0%, #ffffff 100%);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero__title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0 auto var(--spacing-lg);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s, transform 0.1s;
  font-size: 1rem;
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: scale(1.02);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: white;
}

/* ===== features ===== */
.features {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-alt);
}

.features__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  list-style: none;
}

.features__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: white;
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-weight: 500;
}

.icon {
  flex-shrink: 0;
  color: var(--color-primary);
}

@media (min-width: 640px) {
  .features__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features__list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== steps ===== */
.steps {
  padding: var(--spacing-xl) 0;
}

.steps h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.steps__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.step-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  position: relative;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.step-card__number {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: white;
  font-weight: 700;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin-bottom: var(--spacing-sm);
}

.step-card h3 {
  margin-bottom: var(--spacing-xs);
}

@media (min-width: 640px) {
  .steps__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .steps__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== strategies ===== */
.strategies {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-alt);
}

.strategies h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.strategies__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.strategy-card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.strategy-card h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary-dark);
}

.strategies__note {
  text-align: center;
  color: var(--color-text-light);
  font-style: italic;
}

@media (min-width: 640px) {
  .strategies__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .strategies__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== withdrawal ===== */
.withdrawal {
  padding: var(--spacing-xl) 0;
}

.withdrawal h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.withdrawal__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

.withdrawal__info h3 {
  color: var(--color-primary);
  margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.withdrawal__steps ul {
  list-style: none;
  background: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
}

.withdrawal__steps li {
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .withdrawal__content {
    grid-template-columns: 2fr 1fr;
  }
}

/* ===== bets ===== */
.bets {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-alt);
}

.bets h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.bets__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.bets__item {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.bets__label {
  display: block;
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.bets__value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .bets__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== reviews ===== */
.reviews {
  padding: var(--spacing-xl) 0;
}

.reviews h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.reviews__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.review-card {
  background: var(--color-bg-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.review-card__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.review-card__date {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.review-card__rating {
  color: #f59e0b;
  font-size: 1.2rem;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-xs);
}

.reviews__aggregate {
  text-align: center;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: var(--spacing-md);
}

@media (min-width: 640px) {
  .reviews__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .reviews__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== faq ===== */
.faq {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-alt);
}

.faq h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
  border: 1px solid var(--color-border);
}

.faq-item__question {
  padding: var(--spacing-md);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2rem;
}

.faq-item__question::-webkit-details-marker {
  display: none;
}

.faq-item__question::after {
  content: '+';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--color-primary);
}

details[open] .faq-item__question::after {
  content: '−';
}

.faq-item__answer {
  padding: 0 var(--spacing-md) var(--spacing-md);
  color: var(--color-text-light);
}

/* ===== contacts ===== */
.contacts {
  padding: var(--spacing-xl) 0;
}

.contacts h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-xl);
}

.contacts__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.contacts__list {
  list-style: none;
  margin-top: var(--spacing-sm);
}

.contacts__list li {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.contacts__list a {
  color: var(--color-primary);
  text-decoration: none;
}

.contacts__list a:hover {
  text-decoration: underline;
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

@media (min-width: 768px) {
  .contacts__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== footer ===== */
.footer {
  background-color: var(--color-text);
  color: #d1d5db;
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.footer__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__legal {
  font-size: 0.875rem;
  max-width: 800px;
  margin: 0 auto;
}

.footer__links a {
  color: #9ca3af;
  text-decoration: none;
  margin: 0 0.25rem;
}

.footer__links a:hover {
  color: white;
}