:root {
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 72px;
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-display: "Outfit", var(--font-sans);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #09090b;
  --bg-elevated: #13131a;
  --bg-card: #1a1a24;
  --accent: #64a19d;
  --accent-hover: #7ab8b4;
  --accent-muted: rgba(100, 161, 157, 0.15);
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --nav-scrolled-bg: rgba(9, 9, 11, 0.85);
  --nav-menu-bg: rgba(9, 9, 11, 0.95);
  --hero-overlay: linear-gradient(180deg, rgba(9, 9, 11, 0.4) 0%, rgba(9, 9, 11, 0.85) 60%, var(--bg) 100%);
  --cta-overlay: linear-gradient(180deg, rgba(9, 9, 11, 0.7) 0%, rgba(9, 9, 11, 0.9) 100%);
  --visual-shadow: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.5));
  --card-hover-border: rgba(100, 161, 157, 0.3);
  --btn-shadow: 0 4px 16px rgba(100, 161, 157, 0.35);
  --btn-shadow-hover: 0 6px 24px rgba(100, 161, 157, 0.45);
  --input-bg: rgba(255, 255, 255, 0.06);
  --input-shadow: none;
  --input-focus-shadow: none;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f8fafb;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --accent: #4f8f8b;
  --accent-hover: #3d7571;
  --accent-muted: rgba(79, 143, 139, 0.1);
  --text: #1a1f2e;
  --text-muted: #5c6678;
  --border: rgba(26, 31, 46, 0.08);
  --shadow: 0 4px 24px rgba(26, 31, 46, 0.08);
  --shadow-lg: 0 12px 40px rgba(26, 31, 46, 0.12);
  --nav-scrolled-bg: rgba(255, 255, 255, 0.9);
  --nav-menu-bg: rgba(255, 255, 255, 0.98);
  --hero-overlay: linear-gradient(180deg, rgba(248, 250, 251, 0.75) 0%, rgba(248, 250, 251, 0.92) 55%, var(--bg) 100%);
  --cta-overlay: linear-gradient(180deg, rgba(248, 250, 251, 0.88) 0%, rgba(248, 250, 251, 0.95) 100%);
  --visual-shadow: drop-shadow(0 20px 40px rgba(26, 31, 46, 0.12));
  --card-hover-border: rgba(79, 143, 139, 0.25);
  --btn-shadow: 0 4px 16px rgba(79, 143, 139, 0.3);
  --btn-shadow-hover: 0 6px 24px rgba(79, 143, 139, 0.35);
  --input-bg: var(--bg-elevated);
  --input-shadow: var(--shadow);
  --input-focus-shadow: 0 0 0 3px var(--accent-muted);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--accent-hover);
}

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: var(--nav-scrolled-bg);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav__toggle {
  display: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.875rem;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  display: block;
  padding: 0.5rem 0.875rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav__link:hover {
  color: var(--accent);
  background: var(--accent-muted);
}

.nav__flags {
  display: flex;
  gap: 0.25rem;
  margin-left: 0.5rem;
}

.nav__flag {
  display: flex;
  align-items: center;
  padding: 0.375rem;
  border-radius: 6px;
  opacity: 0.7;
  transition: opacity var(--transition), background var(--transition);
}

.nav__flag:hover,
.nav__flag.active {
  opacity: 1;
  background: var(--accent-muted);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.375rem;
  flex-shrink: 0;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1;
  opacity: 0.7;
  cursor: pointer;
  transition: opacity var(--transition), background var(--transition), color var(--transition);
}

.theme-toggle:hover {
  opacity: 1;
  color: var(--accent);
  background: var(--accent-muted);
}

.theme-toggle__icon--light {
  display: none;
}

[data-theme="dark"] .theme-toggle__icon--light {
  display: block;
}

[data-theme="dark"] .theme-toggle__icon--dark {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--dark {
  display: block;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 3rem) 1rem 4rem;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--hero-overlay), url("../img/bg-masthead.jpg") center / cover no-repeat;
  z-index: -1;
}

.hero__content {
  max-width: 720px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 1.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  margin: 0 0 2.5rem;
  line-height: 1.7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--btn-shadow);
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--btn-shadow-hover);
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section__header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section__label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.section__desc {
  color: var(--text-muted);
  margin: 0;
  font-size: 1.05rem;
}

/* Services */
.services {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 100%);
}

.services__visual {
  margin-top: 3rem;
  display: flex;
  justify-content: center;
}

.services__visual img {
  max-width: min(560px, 90%);
  filter: var(--visual-shadow);
  border-radius: var(--radius-lg);
}

/* Partners */
.partners {
  background: var(--bg-elevated);
}

.partners__intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 4rem;
}

.partners__intro-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.partners__grid {
  display: grid;
  gap: 2rem;
}

.partner-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.partner-card:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.partner-card--reverse .partner-card__image {
  order: 2;
}

.partner-card__image {
  background: var(--bg);
}

.partner-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 280px;
}

.partner-card__body {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.partner-card__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
}

.partner-card__name a {
  color: var(--text);
}

.partner-card__name a:hover {
  color: var(--accent);
}

.partner-card__desc {
  color: var(--text-muted);
  margin: 0 0 1.25rem;
  line-height: 1.7;
}

.partner-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

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

/* Contact CTA */
.contact-cta {
  position: relative;
  padding: 6rem 0;
  text-align: center;
}

.contact-cta__bg {
  position: absolute;
  inset: 0;
  background: var(--cta-overlay), url("../img/bg-signup.jpg") center / cover no-repeat;
  z-index: -1;
}

.contact-cta__icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.contact-cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 2rem;
}

.contact-cta__form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto;
  justify-content: center;
}

.contact-cta__input {
  flex: 1 1 240px;
  padding: 0.875rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  box-shadow: var(--input-shadow);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact-cta__input::placeholder {
  color: var(--text-muted);
}

.contact-cta__input:focus {
  border-color: var(--accent);
  box-shadow: var(--input-focus-shadow);
}

/* Contact cards */
.contact {
  padding: 5rem 0;
  background: var(--bg);
}

.contact__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.contact-card:hover {
  border-color: var(--card-hover-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: inherit;
}

.contact-card__icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.contact-card__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.75rem;
}

.contact-card__text {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

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

.social {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 1.125rem;
  box-shadow: var(--shadow);
  transition: color var(--transition), background var(--transition), border-color var(--transition), transform var(--transition);
}

.social__link:hover {
  color: var(--accent);
  border-color: var(--card-hover-border);
  background: var(--accent-muted);
  transform: translateY(-2px);
}

/* Footer */
.footer {
  padding: 2rem 0;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Responsive */
@media (max-width: 900px) {
  .partners__intro {
    grid-template-columns: 1fr;
  }

  .partner-card,
  .partner-card--reverse {
    grid-template-columns: 1fr;
  }

  .partner-card--reverse .partner-card__image {
    order: 0;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto 3rem;
  }
}

@media (min-width: 769px) {
  .nav__actions {
    order: 3;
  }

  .nav__menu {
    order: 2;
    margin-left: auto;
  }
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    background: var(--nav-menu-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

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

  .nav__link {
    padding: 0.75rem 1rem;
  }

  .nav__flags {
    margin-left: 0;
    justify-content: center;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
  }

  .section {
    padding: 4rem 0;
  }
}