/* ========================================
   Impulse Landing Page — CSS
   ======================================== */

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

:root {
  --bg: #0A0F0D;
  --bg-subtle: #080C0A;
  --bg-card: rgba(255, 255, 255, 0.024);
  --border-card: rgba(255, 255, 255, 0.05);
  --accent: #00C286;
  --accent-bg: rgba(0, 194, 134, 0.08);
  --text-primary: #FFFFFF;
  --text-secondary: #C8D5CF;
  --text-tertiary: #8A9B94;
  --text-muted: #6B7B74;
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', system-ui, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

/* --- Container --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  border-radius: 12px;
  transition: opacity 0.2s, transform 0.2s;
  cursor: pointer;
  border: none;
  font-family: var(--font);
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 17px;
}

.btn-sm {
  padding: 10px 24px;
  font-size: 15px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
}

/* --- Section Tags --- */
.section-tag {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.09);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 15, 13, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 32px;
  height: auto;
  color: var(--accent);
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav a:not(.btn) {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.lang-switcher a {
  color: var(--text-muted);
  transition: color 0.2s;
}

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

.lang-active {
  color: var(--accent);
}

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

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding: 160px 0 80px;
  background: radial-gradient(ellipse 60% 60% at 50% 40%, #1A3D2E 0%, var(--bg) 100%);
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.hero h1 {
  font-size: 72px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2px;
  max-width: 900px;
}

.hero-sub {
  font-size: 20px;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 700px;
}

.hero-mockup {
  margin-top: 16px;
  width: 100%;
  max-width: 800px;
  aspect-ratio: 16 / 10;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-mockup span {
  font-size: 16px;
  color: var(--text-muted);
}

/* ========================================
   Problem
   ======================================== */
.problem {
  padding: 100px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.problem-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
}

.problem h2,
.features h2,
.cta h2 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
}

.section-desc {
  font-size: 18px;
  color: var(--text-tertiary);
  line-height: 1.6;
  max-width: 680px;
}

.pain-cards {
  display: flex;
  gap: 24px;
}

.pain-card {
  flex: 1;
  max-width: 240px;
  padding: 28px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pain-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ========================================
   Features
   ======================================== */
.features {
  padding: 100px 0;
  background: var(--bg-subtle);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.features-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 64px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  width: 100%;
}

/* Last card spans full width when 5 items in 2-col grid */
.features-grid .feature-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: 50%;
  justify-self: center;
}

.feature-card {
  padding: 40px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--accent-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card h3 {
  font-size: 22px;
  font-weight: 700;
}

.feature-card p {
  font-size: 15px;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* ========================================
   Privacy
   ======================================== */
.privacy {
  padding: 100px 0;
  background: linear-gradient(180deg, #0D1A14 0%, var(--bg) 100%);
}

.privacy-inner {
  display: flex;
  gap: 80px;
  align-items: center;
}

.privacy-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.privacy h2 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
}

.privacy-text p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.trust-cards {
  width: 440px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.trust-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
}

.trust-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.trust-card svg {
  flex-shrink: 0;
}

/* ========================================
   Final CTA
   ======================================== */
.cta {
  padding: 120px 0;
  background: radial-gradient(ellipse 50% 70% at 50% 50%, #1A3D2E 0%, var(--bg) 100%);
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}

.cta h2 {
  font-size: 52px;
  letter-spacing: -1.5px;
}

.cta-sub {
  font-size: 18px;
  color: var(--text-secondary);
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 48px 0;
  background: #060906;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-links {
  display: flex;
  gap: 48px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-tertiary);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.footer-col a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--text-secondary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 24px;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ========================================
   Responsive — Tablet (<=1024px)
   ======================================== */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 56px;
  }

  .problem h2,
  .features h2,
  .cta h2 {
    font-size: 40px;
  }

  .privacy h2 {
    font-size: 36px;
  }

  .privacy-inner {
    flex-direction: column;
    gap: 48px;
  }

  .trust-cards {
    width: 100%;
  }

  .features-grid .feature-card:last-child:nth-child(odd) {
    max-width: 100%;
  }
}

/* ========================================
   Responsive — Mobile (<=768px)
   ======================================== */
@media (max-width: 768px) {
  /* Header */
  .nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 15, 13, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 24px;
    gap: 24px;
  }

  .nav.nav-open {
    display: flex;
  }

  .nav a:not(.btn) {
    font-size: 20px;
  }

  .nav .btn {
    width: 100%;
    justify-content: center;
    padding: 16px;
    font-size: 17px;
    border-radius: 12px;
  }

  .menu-toggle {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: 120px 0 60px;
  }

  .hero h1 {
    font-size: 40px;
    letter-spacing: -1px;
  }

  .hero-sub {
    font-size: 17px;
  }

  .hide-mobile {
    display: none;
  }

  .btn-lg {
    padding: 14px 28px;
    font-size: 16px;
  }

  /* Problem */
  .problem {
    padding: 72px 0;
  }

  .problem-inner {
    gap: 36px;
  }

  .pain-cards {
    flex-direction: column;
    width: 100%;
  }

  .pain-card {
    max-width: 100%;
  }

  /* Features */
  .features {
    padding: 72px 0;
  }

  .features-inner {
    gap: 48px;
  }

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

  .features-grid .feature-card:last-child:nth-child(odd) {
    max-width: 100%;
  }

  .feature-card {
    padding: 28px;
  }

  /* Privacy */
  .privacy {
    padding: 72px 0;
  }

  .privacy-text {
    gap: 20px;
  }

  /* CTA */
  .cta {
    padding: 80px 0;
  }

  .cta h2 {
    font-size: 36px;
    letter-spacing: -1px;
  }

  /* Footer */
  .footer-top {
    flex-direction: column;
    gap: 36px;
  }
}

/* ========================================
   Responsive — Small Mobile (<=480px)
   ======================================== */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 32px;
  }

  .problem h2,
  .features h2,
  .cta h2 {
    font-size: 32px;
  }

  .privacy h2 {
    font-size: 30px;
  }

  .hero-sub,
  .section-desc {
    font-size: 16px;
  }
}