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

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7fb;
  --color-surface: #ffffff;
  --color-text: #14151a;
  --color-text-muted: #5b5f6d;
  --color-border: #e6e7ef;
  --color-primary: #e11d2e;
  --color-primary-dark: #b3121f;
  --color-primary-light: #fde7e7;
  --color-accent: #ff5a5f;
  --shadow-sm: 0 2px 8px rgba(20, 21, 26, 0.06);
  --shadow-md: 0 12px 32px rgba(20, 21, 26, 0.08);
  --shadow-lg: 0 24px 64px rgba(20, 21, 26, 0.12);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --color-bg: #0f1015;
  --color-bg-alt: #16171f;
  --color-surface: #1a1b24;
  --color-text: #f3f4f8;
  --color-text-muted: #a2a5b5;
  --color-border: #2a2c38;
  --color-primary: #ff5d5f;
  --color-primary-dark: #e8383c;
  --color-primary-light: #3a1a1c;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.45);
}

html { scroll-behavior: smooth; }

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

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

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

ul { list-style: none; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 { line-height: 1.2; font-weight: 800; letter-spacing: -0.02em; }

section { position: relative; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn--sm { padding: 8px 18px; font-size: 0.9rem; }
.btn--lg { padding: 14px 30px; font-size: 1rem; }

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.header.scrolled { border-bottom-color: var(--color-border); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.25rem;
}
.logo__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-size: 1.2rem;
}

.nav {
  display: flex;
  gap: 32px;
  flex: 1;
  justify-content: center;
}
.nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav a:hover { color: var(--color-text); }
.nav a:hover::after { width: 100%; }

.header__actions { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  transition: transform var(--transition), background var(--transition);
}
.theme-toggle:hover { transform: rotate(20deg); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  padding: 160px 0 100px;
  background: radial-gradient(circle at 80% 10%, var(--color-primary-light), transparent 60%);
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.hero h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); margin-bottom: 20px; }
.highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__text {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 32px;
}

.hero__cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }

.hero__stats { display: flex; gap: 40px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat__number { font-size: 1.8rem; font-weight: 800; color: var(--color-primary); }
.stat__label { font-size: 0.85rem; color: var(--color-text-muted); }

.hero__visual {
  position: relative;
  height: 420px;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(4px);
  opacity: 0.85;
}
.orb--1 {
  width: 280px; height: 280px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  top: 20px; right: 20px;
  animation: float 6s ease-in-out infinite;
}
.orb--2 {
  width: 160px; height: 160px;
  background: var(--color-primary-light);
  bottom: 20px; left: 10px;
  animation: float 7s ease-in-out infinite reverse;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.card-float {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  animation: floatCard 5s ease-in-out infinite;
}
.card-float span { font-size: 1.5rem; }
.card-float strong { display: block; font-size: 0.9rem; }
.card-float small { color: var(--color-text-muted); font-size: 0.78rem; }
.card-float--1 { top: 40px; left: 0; }
.card-float--2 { bottom: 40px; right: 0; animation-delay: 1.5s; }
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ---------- Logos ---------- */
.logos { padding: 48px 0; border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.logos__label { text-align: center; color: var(--color-text-muted); font-size: 0.85rem; margin-bottom: 20px; }
.logos__row {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  opacity: 0.6;
}

/* ---------- Section head ---------- */
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-head h2 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom: 12px; }
.section-head__text { color: var(--color-text-muted); }

/* ---------- Features ---------- */
.features { padding: 120px 0; background: var(--color-bg-alt); }
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.feature-card__icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.feature-card p { color: var(--color-text-muted); font-size: 0.95rem; }

/* ---------- How it works ---------- */
.how { padding: 120px 0; }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.step {
  padding: 32px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  position: relative;
}
.step__number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-primary-light);
  -webkit-text-stroke: 1.5px var(--color-primary);
  margin-bottom: 16px;
}
.step h3 { margin-bottom: 10px; font-size: 1.1rem; }
.step p { color: var(--color-text-muted); font-size: 0.95rem; }

/* ---------- Testimonials ---------- */
.testimonials { padding: 120px 0; background: var(--color-bg-alt); }
.testimonials__track {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  min-height: 200px;
}
.testimonial {
  position: absolute;
  inset: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  opacity: 0;
  transform: translateX(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
}
.testimonial.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  position: relative;
}
.testimonial p { font-size: 1.1rem; margin-bottom: 20px; font-style: italic; }
.testimonial footer strong { display: block; }
.testimonial footer span { color: var(--color-text-muted); font-size: 0.85rem; }

.testimonials__dots { display: flex; justify-content: center; gap: 10px; margin-top: 28px; }
.dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.dot.active { background: var(--color-primary); transform: scale(1.3); }

/* ---------- CTA ---------- */
.cta {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  text-align: center;
}
.cta__inner h2 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom: 12px; }
.cta__inner p { opacity: 0.9; margin-bottom: 28px; }
.cta .btn--primary { background: #fff; color: var(--color-primary-dark); }
.cta .btn--primary:hover { box-shadow: 0 12px 32px rgba(0,0,0,0.25); }

/* ---------- Contact ---------- */
.contact { padding: 120px 0; }
.contact__inner { max-width: 720px; margin: 0 auto; }
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.9rem; font-weight: 600; }
.form-group input, .form-group textarea {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}
.form-group input.invalid, .form-group textarea.invalid { border-color: #e5484d; }
.error-msg { color: #e5484d; font-size: 0.8rem; min-height: 1em; }
.contact-form .btn { align-self: flex-start; }
.form-success {
  display: none;
  color: #1a9c5c;
  font-weight: 600;
  font-size: 0.9rem;
}
.form-success.show { display: block; }

/* ---------- Footer ---------- */
.footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); padding: 64px 0 24px; }
.footer__inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  padding-bottom: 40px;
}
.footer__brand p { color: var(--color-text-muted); margin-top: 12px; font-size: 0.9rem; max-width: 260px; }
.footer__links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer__col h4 { font-size: 0.9rem; margin-bottom: 16px; }
.footer__col a { display: block; color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 10px; transition: color var(--transition); }
.footer__col a:hover { color: var(--color-primary); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}
.footer__social { display: flex; gap: 16px; }
.footer__social a { font-size: 1.1rem; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 999;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__visual { height: 280px; order: -1; }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__links { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 720px) {
  .nav { display: none; }
  .hamburger { display: flex; }
  .header__actions .btn--sm { display: none; }

  .nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 24px;
    gap: 18px;
  }

  .features__grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer__links { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 12px; text-align: center; }
  .hero { padding: 130px 0 70px; }
  .logos__row { gap: 24px; }
}