/* === Fonts === */
@font-face {
  font-family: 'Inter';
  src: url('assets/fonts/inter-regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('assets/fonts/inter-bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* === Variables === */
:root {
  --bg-primary: #1F2937;
  --bg-alt: #111827;
  --text-primary: #E5E7EB;
  --text-muted: #9CA3AF;
  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --border: #374151;
  --radius: 8px;
  --transition: 0.2s ease;
  --header-height: 72px;
}

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

html {
  scroll-padding-top: calc(var(--header-height) + 16px);
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

/* === Focus === */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

/* === Buttons === */
.btn {
  display: inline-block;
  font-family: inherit;
  font-weight: 700;
  font-size: 16px;
  padding: 14px 32px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  text-align: center;
}

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

.btn--hero {
  background: #FFFFFF;
  color: var(--bg-alt);
}

.btn--hero:hover {
  background: #DBEAFE;
}

.btn--primary {
  background: #FFFFFF;
  color: var(--bg-alt);
  font-size: 14px;
  padding: 10px 20px;
}

.btn--primary:hover {
  background: #DBEAFE;
}

.btn--secondary {
  background: var(--accent);
  color: #FFFFFF;
}

.btn--secondary:hover {
  background: var(--accent-hover);
}

.btn--large {
  font-size: 18px;
  padding: 18px 48px;
}

.btn--small {
  font-size: 14px;
  padding: 8px 20px;
  background: var(--accent);
  color: #FFFFFF;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  transition: background var(--transition);
}

.btn--small:hover {
  background: var(--accent-hover);
}

/* === Link === */
.link {
  color: var(--accent);
  transition: color var(--transition);
}

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

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

.header--scrolled {
  background: rgba(17, 24, 39, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.header__logo {
  font-weight: 700;
  font-size: 20px;
  color: #FFFFFF;
  letter-spacing: -0.5px;
}

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

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

.header__link {
  font-size: 14px;
  color: var(--text-muted);
  transition: color var(--transition);
}

.header__link:hover {
  color: #FFFFFF;
}

.header__cta {
  margin-left: 8px;
}

/* === Burger === */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

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

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

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

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

/* === Hero === */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  padding-top: var(--header-height);
}

.hero__inner {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  color: #FFFFFF;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero__subtitle {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero__note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* === Sections === */
.section {
  padding: 96px 0;
  background: var(--bg-primary);
}

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

.section__title {
  font-size: 32px;
  font-weight: 700;
  color: #FFFFFF;
  text-align: center;
  margin-bottom: 56px;
  letter-spacing: -0.5px;
}

/* === Cards (Problems) === */
.cards {
  display: grid;
  gap: 24px;
}

.cards--3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--accent);
}

.card__title {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.card__text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

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

.step {
  padding: 32px;
}

.step__number {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  display: block;
  margin-bottom: 16px;
}

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

.step__meta {
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 16px;
}

.step__text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* === Case Cards === */
.case-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color var(--transition);
}

.case-card:hover {
  border-color: var(--accent);
}

.case-card__title {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 10px;
  border-radius: 4px;
}

.case-card__metric {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.case-card__arrow {
  color: var(--text-muted);
}

.case-card__effect {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.case-card__text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

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

.pricing__card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  position: relative;
}

.pricing__card--featured {
  border-color: var(--accent);
  transform: scale(1.05);
}

.pricing__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
}

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

.pricing__price {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 24px;
}

.pricing__features {
  text-align: left;
  margin-bottom: 32px;
}

.pricing__features li {
  font-size: 14px;
  color: var(--text-muted);
  padding: 8px 0;
  border-bottom: 1px solid rgba(55, 65, 81, 0.5);
}

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

.pricing__note {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 32px;
}

/* === About === */
.about {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  max-width: 800px;
  margin: 0 auto;
}

.about__icon {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  font-weight: 700;
  color: #FFFFFF;
}

.about__content p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about__content p:last-child {
  margin-bottom: 0;
}

.about__channel {
  margin-top: 24px;
}

/* === Accordion (FAQ) === */
.accordion {
  max-width: 720px;
  margin: 0 auto;
}

.accordion__item {
  border-bottom: 1px solid var(--border);
}

.accordion__item:first-child {
  border-top: 1px solid var(--border);
}

.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: color var(--transition);
}

.accordion__trigger:hover {
  color: #FFFFFF;
}

.accordion__trigger:hover .accordion__question {
  color: #FFFFFF;
}

.accordion__question {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  transition: color var(--transition);
}

.accordion__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-left: 16px;
  position: relative;
}

.accordion__icon::before,
.accordion__icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--text-muted);
  border-radius: 1px;
  transition: transform 0.3s ease;
}

.accordion__icon::before {
  width: 14px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.accordion__icon::after {
  width: 2px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.accordion__content {
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  max-height: 0;
  padding-bottom: 0;
}

.accordion__content:not([hidden]) {
  max-height: 300px;
  padding-bottom: 20px;
}

.accordion__content p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* === Final CTA === */
.section--cta {
  text-align: center;
  padding: 120px 0;
}

.cta__text {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.cta__email {
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

/* === Footer === */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
}

.footer__brand {
  font-weight: 700;
  color: var(--text-primary);
}

.footer__sep {
  color: var(--border);
}

/* === Cookie Banner === */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  z-index: 200;
  font-size: 14px;
  color: var(--text-muted);
}

.cookie-banner[hidden] {
  display: none;
}

/* === Fade-in animation === */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .cards--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing__card--featured {
    transform: none;
    grid-column: 1 / -1;
    max-width: 400px;
    justify-self: center;
  }
}

@media (max-width: 768px) {
  .header__nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    height: 100dvh;
    background: var(--bg-alt);
    flex-direction: column;
    align-items: flex-start;
    padding: 96px 32px 32px;
    gap: 8px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 99;
    border-left: 1px solid var(--border);
  }

  .header__nav--open {
    transform: translateX(0);
  }

  .header__menu {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .header__link {
    display: block;
    padding: 12px 0;
    font-size: 16px;
  }

  .header__cta {
    margin-left: 0;
    margin-top: 16px;
    width: 100%;
    text-align: center;
  }

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

  .hero__title {
    font-size: 32px;
  }

  .hero__subtitle {
    font-size: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section__title {
    font-size: 24px;
    margin-bottom: 40px;
  }

  .cards--3 {
    grid-template-columns: 1fr;
  }

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

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

  .pricing__card--featured {
    transform: none;
    max-width: none;
  }

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

  .case-card__metric {
    font-size: 24px;
  }

  .section--cta {
    padding: 80px 0;
  }

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

  .footer__sep {
    display: none;
  }

  .cookie-banner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 28px;
  }

  .container {
    padding: 0 16px;
  }
}