/* ===========================
   Vistenne Landing Page
   Monochromatic Brand Identity
   =========================== */

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

:root {
  --white: #ffffff;
  --off-white: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  --black: #0a0a0a;
  --dark-bg: #1a1a2e;

  --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container: 1120px;
  --gutter: 24px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  font-size: 16px;
}

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

/* ===========================
   Navigation
   =========================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--gray-900);
  text-decoration: none;
}

.nav-cta {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--gray-900);
  text-decoration: none;
  padding: 8px 20px;
  border: 1px solid var(--gray-900);
  border-radius: 6px;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  background: var(--gray-900);
  color: var(--white);
}

/* ===========================
   Buttons
   =========================== */

.btn-primary {
  display: inline-block;
  background: var(--gray-900);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 14px 32px;
  border: 1px solid var(--gray-900);
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--black);
}

/* ===========================
   Hero
   =========================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 80px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 120px var(--gutter) 80px;
}

.hero-content {
  flex: 1;
  max-width: 560px;
}

.hero-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  letter-spacing: 8px;
  text-transform: lowercase;
  color: var(--gray-400);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--gray-600);
  margin-bottom: 40px;
  max-width: 460px;
}

.hero-visual {
  flex: 0 0 auto;
}

.phone-mockup {
  width: 280px;
  height: 560px;
  background: var(--gray-900);
  border-radius: 44px;
  padding: 6px;
  box-shadow: 0 32px 64px rgba(0, 0, 0, 0.10), 0 8px 24px rgba(0, 0, 0, 0.06);
  position: relative;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--gray-100);
  border-radius: 40px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Dynamic Island */
.phone-screen::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 24px;
  background: var(--gray-900);
  border-radius: 20px;
  z-index: 2;
}

.phone-placeholder {
  text-align: center;
}

.phone-placeholder-text {
  font-size: 12px;
  color: var(--gray-300);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 300;
}

/* ===========================
   Philosophy
   =========================== */

.philosophy {
  padding: 80px 0;
  background: var(--off-white);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}

.philosophy-text {
  font-family: var(--font-serif);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 400;
  line-height: 1.6;
  text-align: center;
  color: var(--gray-700);
  max-width: 640px;
  margin: 0 auto;
}

.philosophy-text em {
  font-style: italic;
  color: var(--gray-900);
}

/* ===========================
   How it works
   =========================== */

.how-it-works {
  padding: 120px 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 500;
  text-align: center;
  letter-spacing: -0.01em;
  margin-bottom: 64px;
  color: var(--gray-900);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.step {
  text-align: center;
  padding: 0 16px;
}

.step-number {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 400;
  color: var(--gray-300);
  margin-bottom: 20px;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--gray-900);
}

.step-desc {
  font-size: 15px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--gray-600);
}

/* ===========================
   Features
   =========================== */

.features {
  padding: 120px 0;
  background: var(--gray-900);
  color: var(--white);
}

.features .section-title {
  color: var(--white);
}

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

.feature-card {
  padding: 40px 32px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
}

.feature-icon {
  color: var(--gray-400);
  margin-bottom: 20px;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--white);
}

.feature-desc {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--gray-400);
}

/* ===========================
   Waitlist
   =========================== */

.waitlist {
  padding: 120px 0;
}

.waitlist-inner {
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.waitlist-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 500;
  margin-bottom: 16px;
  color: var(--gray-900);
}

.waitlist-sub {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--gray-600);
  margin-bottom: 40px;
}

.waitlist-form {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.waitlist-input {
  flex: 1;
  padding: 14px 20px;
  font-family: var(--font-sans);
  font-size: 15px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s ease;
  color: var(--gray-900);
  background: var(--white);
}

.waitlist-input::placeholder {
  color: var(--gray-400);
}

.waitlist-input:focus {
  border-color: var(--gray-900);
}

.waitlist-note {
  font-size: 13px;
  color: var(--gray-400);
}

.waitlist-success {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--gray-900);
  font-style: italic;
}

/* ===========================
   Footer
   =========================== */

.footer {
  padding: 48px 0;
  border-top: 1px solid var(--gray-200);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--gray-900);
}

.footer-copy {
  font-size: 13px;
  color: var(--gray-400);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--gray-600);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--gray-900);
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
    gap: 32px;
    padding-top: 100px;
    padding-bottom: 60px;
    min-height: auto;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    order: 1;
  }

  .hero-logo {
    font-size: 16px;
    letter-spacing: 6px;
    margin-bottom: 16px;
  }

  .phone-mockup {
    width: 180px;
    height: 360px;
    border-radius: 32px;
    padding: 4px;
  }

  .phone-screen {
    border-radius: 29px;
  }

  .phone-screen::before {
    width: 56px;
    height: 18px;
    top: 8px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 400px;
    margin: 0 auto;
  }

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

  .feature-card {
    padding: 28px 24px;
  }

  .waitlist-form {
    flex-direction: column;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 1024px) and (min-width: 769px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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