/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
  /* Brand Colors */
  --color-bg-dark: #0f2a2c;
  --color-dark-teal: #234e52;
  --color-deep-teal: #285e61;
  --color-primary-teal: #319795;
  --color-teal: #38b2ac;
  --color-bright-teal: #4fd1c5;
  --color-light-teal: #81e6d9;
  --color-pale-teal: #b2f5ea;

  /* Neutral Colors */
  --color-neutral-50: #fafbfb;
  --color-neutral-100: #f5f7f7;
  --color-neutral-200: #718096;
  --color-white: #ffffff;

  /* Typography */
  --font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-heavy: 800;

  /* Font Sizes - Fluid Typography */
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.375rem);
  --font-size-xl: clamp(1.5rem, 1.3rem + 1vw, 2.25rem);
  --font-size-2xl: clamp(2rem, 1.6rem + 2vw, 3.5rem);

  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 2.5rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: var(--space-md);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 42, 44, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 42, 44, 0.1), 0 2px 4px -1px rgba(15, 42, 44, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(15, 42, 44, 0.1), 0 4px 6px -2px rgba(15, 42, 44, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(15, 42, 44, 0.1), 0 10px 10px -5px rgba(15, 42, 44, 0.04);

  /* Transitions */
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--color-dark-teal);
  background-color: var(--color-white);
  padding-top: 76px; /* Reserve space for fixed navbar */
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ===================================
   Navbar / Header
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  min-height: 44px;
}

.navbar__logo {
  text-decoration: none;
  display: block;
  line-height: 1;
}

.logo-combo-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  line-height: 1;
}

.logo-combo-nav__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.logo-combo-nav__mark svg {
  width: 100%;
  height: 100%;
}

.logo-combo-nav__wordmark {
  font-size: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
  font-weight: var(--font-weight-heavy);
  letter-spacing: -0.5px;
  color: var(--color-bg-dark);
  line-height: 1;
}

.navbar__actions {
  display: none;
}

.navbar__actions .btn {
  padding: 0.5rem 1.5rem;
  font-size: 1rem;
  line-height: 1.5;
}

.navbar__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base);
}

.navbar__toggle:hover {
  background-color: var(--color-neutral-100);
}

.navbar__toggle-icon,
.navbar__toggle-icon::before,
.navbar__toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-bg-dark);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.navbar__toggle-icon {
  position: relative;
}

.navbar__toggle-icon::before,
.navbar__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.navbar__toggle-icon::before {
  top: -8px;
}

.navbar__toggle-icon::after {
  top: 8px;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon {
  background-color: transparent;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

.navbar__menu {
  display: none;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-neutral-100);
  margin-top: var(--space-sm);
}

.navbar__menu.is-open {
  display: flex;
}

.navbar__menu-item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-bg-dark);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

.navbar__menu-item:hover {
  background-color: var(--color-neutral-100);
}

.navbar__menu-item--cta {
  background-color: var(--color-bright-teal);
  color: var(--color-bg-dark);
  text-align: center;
}

.navbar__menu-item--cta:hover {
  background-color: var(--color-light-teal);
}

/* ===================================
   Layout Utilities
   =================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-bg-dark);
  text-align: center;
  margin-bottom: var(--space-xl);
  line-height: 1.2;
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-deep-teal) 100%);
  color: var(--color-white);
  padding: var(--space-2xl) 0;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -15%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(79, 209, 197, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(129, 230, 217, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero__text {
  text-align: center;
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__tagline {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.hero__features-tagline {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-light-teal);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.hero__description {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-regular);
  color: var(--color-pale-teal);
  margin-bottom: var(--space-lg);
  line-height: 1.7;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
}

.hero__mockup {
  max-width: 280px;
  width: 100%;
  aspect-ratio: 9 / 19.5;
  filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.3));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* Phone Mockup Styles */
.phone-mockup {
  position: relative;
  max-width: 280px;
  width: 100%;
}

.phone-mockup__frame {
  position: relative;
  background: #1a1a1a;
  border-radius: 40px;
  padding: 12px;
  box-shadow:
    0 0 0 2px #333,
    0 25px 50px rgba(0, 0, 0, 0.4),
    inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.phone-mockup__screen {
  position: relative;
  border-radius: 32px;
  overflow: hidden;
  background: #000;
}

.phone-mockup__screen img {
  width: 100%;
  height: auto;
  display: block;
}


/* Mockup Placeholder Styles (for feature sections) */
.mockup-placeholder {
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%);
  border: 3px dashed rgba(113, 128, 150, 0.3);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #718096;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
}