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

:root {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --bg-tertiary: #21262D;
  --border: #30363D;
  --text-primary: #F0F6FC;
  --text-secondary: #8B949E;
  --text-muted: #484F58;
  --accent-cyan: #58A6FF;
  --accent-green: #3FB950;
  --accent-amber: #D29922;
  --accent-purple: #BC8CFF;
  --accent-red: #F85149;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1120px;
  --nav-height: 64px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  overflow-x: hidden;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  overflow: hidden;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== ANIMATIONS ===== */
.animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn--primary {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

.btn--primary:hover {
  box-shadow: 0 4px 20px rgba(88, 166, 255, 0.3);
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn--outline:hover {
  border-color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 14px 28px;
  font-size: 1rem;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0);
  backdrop-filter: blur(0px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
}

.nav.scrolled {
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.125rem;
}

.nav__logo {
  width: 32px;
  height: 32px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__links a:not(.btn) {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav__links a:not(.btn):hover {
  color: var(--text-primary);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}

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

/* ===== HERO ===== */
.hero {
  padding: calc(var(--nav-height) + 64px) 0 80px;
  overflow: clip;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero__title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  overflow-wrap: break-word;
  word-break: break-word;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
}

.hero__ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero__image {
  position: relative;
}

.hero__image-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: radial-gradient(ellipse at center, rgba(88, 166, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero__image {
  overflow: hidden;
}

.hero__image img {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
}

/* ===== STATS BAR ===== */
.stats {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.stats__inner {
  display: flex;
  justify-content: center;
  gap: 64px;
  flex-wrap: wrap;
}

.stats__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stats__number {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.stats__number--cyan { color: var(--accent-cyan); }
.stats__number--green { color: var(--accent-green); }
.stats__number--amber { color: var(--accent-amber); }
.stats__number--purple { color: var(--accent-purple); }

.stats__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== SECTION TITLES ===== */
.section__title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section__subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== FEATURES ===== */
.features {
  padding: 96px 0;
}

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

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

.feature-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card__icon svg {
  width: 22px;
  height: 22px;
}

.feature-card__icon--cyan {
  background: rgba(88, 166, 255, 0.12);
  color: var(--accent-cyan);
}

.feature-card__icon--green {
  background: rgba(63, 185, 80, 0.12);
  color: var(--accent-green);
}

.feature-card__icon--amber {
  background: rgba(210, 153, 34, 0.12);
  color: var(--accent-amber);
}

.feature-card__icon--purple {
  background: rgba(188, 140, 255, 0.12);
  color: var(--accent-purple);
}

.feature-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card__desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== SHOWCASE ===== */
.showcase {
  padding: 96px 0;
  background: var(--bg-secondary);
}

.showcase__tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.showcase__tab {
  padding: 10px 20px;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 500;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.showcase__tab:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.showcase__tab.active {
  background: var(--accent-cyan);
  color: var(--bg-primary);
  border-color: var(--accent-cyan);
}

.showcase__panel {
  display: none;
}

.showcase__panel.active {
  display: block;
}

.showcase__panel img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.3);
  margin: 0 auto;
}

.showcase__caption {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-top: 16px;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
  padding: 96px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: center;
  padding: 32px 24px;
}

.step__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(88, 166, 255, 0.12);
  color: var(--accent-cyan);
  font-size: 1.25rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.step__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step__desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

.faq__list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq__item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq__question {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color 0.15s ease;
}

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

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

details[open] .faq__question::after {
  content: '-';
}

.faq__answer {
  padding: 0 24px 18px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===== CTA BANNER ===== */
.cta-banner {
  padding: 96px 0;
}

.cta-banner__inner {
  text-align: center;
  background: linear-gradient(135deg, rgba(88, 166, 255, 0.08) 0%, rgba(188, 140, 255, 0.08) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 64px 32px;
}

.cta-banner__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer__brand .nav__logo {
  width: 24px;
  height: 24px;
}

.footer__tagline {
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.15s ease;
}

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

.footer__copy {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* ===== RESPONSIVE ===== */

/* Tablet */
@media (max-width: 768px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__title {
    font-size: 2.25rem;
  }

  .hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__ctas {
    justify-content: center;
  }

  .hero__image {
    order: -1;
    max-width: 520px;
    margin: 0 auto;
  }

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

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

  .stats__inner {
    gap: 32px;
  }

  .section__title {
    font-size: 1.625rem;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    flex-direction: column;
    background: var(--bg-primary);
    padding: 32px 24px;
    gap: 24px;
    border-top: 1px solid var(--border);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__hamburger {
    display: flex;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .hero {
    padding: calc(var(--nav-height) + 40px) 0 48px;
  }

  .hero__title {
    font-size: 1.875rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .btn--lg {
    padding: 12px 24px;
    font-size: 0.9375rem;
  }

  .stats__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .features,
  .showcase,
  .how-it-works,
  .faq,
  .cta-banner {
    padding: 64px 0;
  }

  .feature-card {
    padding: 20px;
  }

  .cta-banner__inner {
    padding: 40px 20px;
  }

  .cta-banner__title {
    font-size: 1.375rem;
  }
}