/* PetNudge Website - Premium Apple-like Design */
/* Mobile-first, accessible, performant */

/* ==========================================
   CSS Custom Properties (Design Tokens)
   ========================================== */
:root {
  /* Colors */
  --color-primary: #FF6B35;
  --color-primary-dark: #E55A2B;
  --color-primary-light: #FF8A5C;
  --color-secondary: #4ECDC4;
  --color-secondary-dark: #3DB9B1;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F7;
  --color-gray-200: #E8E8ED;
  --color-gray-300: #D2D2D7;
  --color-gray-400: #86868B;
  --color-gray-500: #6E6E73;
  --color-gray-600: #424245;
  --color-gray-700: #2D2D30;
  --color-gray-800: #1D1D1F;
  --color-gray-900: #0A0A0A;

  /* Semantic */
  --color-success: #34C759;
  --color-warning: #FF9500;
  --color-error: #FF3B30;
  --color-lost: #FF3B30;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-header: 100;
  --z-sticky: 90;
  --z-modal: 200;

  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, select, textarea {
  font: inherit;
}

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

ul, ol {
  list-style: none;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* ==========================================
   Utility Classes
   ========================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container--narrow {
  max-width: var(--container-narrow);
}

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

/* ==========================================
   Header & Navigation
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-gray-200);
  transition: background var(--transition-normal);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-800);
}

.header__logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-lg);
}

.header__nav {
  display: none;
}

.header__nav-list {
  display: flex;
  gap: var(--space-8);
}

.header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

.header__nav-link:hover {
  color: var(--color-gray-800);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--color-gray-100);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  transition: background var(--transition-fast);
}

.lang-toggle:hover {
  background: var(--color-gray-200);
}

.lang-toggle__icon {
  width: 16px;
  height: 16px;
}

/* Mobile Menu Button */
.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-gray-600);
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-align: center;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-gray-900);
  color: var(--color-white);
}

.btn--primary:hover {
  background: var(--color-gray-700);
  transform: translateY(-1px);
}

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

.btn--secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn--ghost {
  background: transparent;
  color: var(--color-gray-600);
}

.btn--ghost:hover {
  color: var(--color-gray-800);
  background: var(--color-gray-100);
}

.btn--large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-2xl);
}

.btn__icon {
  width: 20px;
  height: 20px;
}

/* App Store Button */
.btn--appstore {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--space-3) var(--space-5);
  gap: var(--space-3);
}

.btn--appstore:hover {
  background: var(--color-gray-800);
}

.btn--appstore svg {
  width: 24px;
  height: 24px;
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  padding: calc(64px + var(--space-16)) 0 var(--space-20);
  background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-gray-900);
  margin-bottom: var(--space-5);
  letter-spacing: -0.02em;
}

.hero__title-highlight {
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  max-width: 540px;
  margin: 0 auto var(--space-8);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

/* ==========================================
   Section Base Styles
   ========================================== */
.section {
  padding: var(--space-20) 0;
}

.section--gray {
  background: var(--color-gray-50);
}

.section--dark {
  background: var(--color-gray-900);
  color: var(--color-white);
}

.section--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
}

.section--secondary {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
  color: var(--color-white);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section--dark .section__label,
.section--primary .section__label {
  color: rgba(255, 255, 255, 0.7);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.section--dark .section__title,
.section--primary .section__title,
.section--secondary .section__title {
  color: var(--color-white);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  max-width: 600px;
  margin: 0 auto;
}

.section--dark .section__subtitle,
.section--primary .section__subtitle,
.section--secondary .section__subtitle {
  color: rgba(255, 255, 255, 0.8);
}

/* ==========================================
   Problem Section
   ========================================== */
.problem__grid {
  display: grid;
  gap: var(--space-6);
}

.problem__card {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md);
}

.problem__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-error);
  color: var(--color-white);
  border-radius: var(--radius-xl);
  font-size: 24px;
}

.problem__content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-gray-800);
}

.problem__content p {
  color: var(--color-gray-500);
}

/* ==========================================
   Solution Section
   ========================================== */
.solution__grid {
  display: grid;
  gap: var(--space-6);
}

.solution__card {
  padding: var(--space-8);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-2xl);
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.solution__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  font-size: 32px;
}

.solution__card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.solution__card p {
  color: rgba(255, 255, 255, 0.8);
}

/* ==========================================
   How It Works Section
   ========================================== */
.steps {
  display: grid;
  gap: var(--space-8);
  counter-reset: step;
}

.step {
  display: flex;
  gap: var(--space-6);
  align-items: flex-start;
}

.step__number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-xl);
  font-weight: 700;
  border-radius: var(--radius-full);
}

.step__content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-gray-800);
}

.step__content p {
  color: var(--color-gray-500);
}

/* ==========================================
   Lost Mode Section (Differentiator)
   ========================================== */
.lost-mode {
  text-align: center;
}

.lost-mode__demo {
  max-width: 400px;
  margin: 0 auto var(--space-10);
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-2xl);
}

.lost-mode__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-lost);
  border-radius: var(--radius-xl);
  color: var(--color-white);
  margin-bottom: var(--space-6);
}

.lost-mode__header-icon {
  font-size: 24px;
}

.lost-mode__header-text {
  text-align: left;
}

.lost-mode__header-text strong {
  display: block;
  font-size: var(--font-size-lg);
}

.lost-mode__header-text span {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

.lost-mode__info {
  text-align: left;
}

.lost-mode__pet-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.lost-mode__contact {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-gray-100);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
}

.lost-mode__contact-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-success);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 24px;
}

.lost-mode__contact-text strong {
  display: block;
  color: var(--color-gray-800);
}

.lost-mode__contact-text span {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

.lost-mode__reward {
  padding: var(--space-4);
  background: var(--color-warning);
  color: var(--color-white);
  border-radius: var(--radius-xl);
  font-weight: 500;
}

.lost-mode__features {
  display: grid;
  gap: var(--space-6);
  text-align: left;
}

.lost-mode__feature {
  display: flex;
  gap: var(--space-4);
}

.lost-mode__feature-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-gray-100);
  border-radius: var(--radius-lg);
  font-size: 20px;
}

.lost-mode__feature h4 {
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--color-gray-800);
}

.lost-mode__feature p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Privacy Section
   ========================================== */
.privacy__grid {
  display: grid;
  gap: var(--space-6);
}

.privacy__card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
}

.privacy__icon {
  flex-shrink: 0;
  font-size: 24px;
}

.privacy__card h4 {
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.privacy__card p {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* ==========================================
   Features Overview (Secondary)
   ========================================== */
.features__grid {
  display: grid;
  gap: var(--space-6);
}

.feature-card {
  padding: var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-gray-100);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  font-size: 24px;
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-gray-800);
}

.feature-card p {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Pricing Section
   ========================================== */
.pricing__card {
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-10);
  background: var(--color-white);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-xl);
  text-align: center;
}

.pricing__badge {
  display: inline-flex;
  padding: var(--space-2) var(--space-4);
  background: var(--color-success);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.pricing__title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-gray-900);
}

.pricing__subtitle {
  color: var(--color-gray-500);
  margin-bottom: var(--space-8);
}

.pricing__features {
  text-align: left;
  margin-bottom: var(--space-8);
}

.pricing__feature {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.pricing__feature:last-child {
  border-bottom: none;
}

.pricing__feature-icon {
  color: var(--color-success);
}

.pricing__feature span {
  color: var(--color-gray-600);
}

.pricing__plans {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.pricing__plan {
  padding: var(--space-4);
  background: var(--color-gray-50);
  border-radius: var(--radius-xl);
  text-align: left;
}

.pricing__plan strong {
  display: block;
  color: var(--color-gray-800);
}

.pricing__plan span {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ==========================================
   FAQ Section
   ========================================== */
.faq__list {
  max-width: 700px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-gray-200);
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-5) 0;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-gray-800);
}

.faq__question:hover {
  color: var(--color-primary);
}

.faq__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-gray-400);
  transition: transform var(--transition-fast);
}

.faq__item.is-open .faq__icon {
  transform: rotate(45deg);
}

.faq__answer {
  display: none;
  padding-bottom: var(--space-5);
  color: var(--color-gray-500);
  line-height: 1.7;
}

.faq__item.is-open .faq__answer {
  display: block;
}

/* ==========================================
   Waitlist Section
   ========================================== */
.waitlist__content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.waitlist__icon {
  font-size: 48px;
  margin-bottom: var(--space-4);
}

.waitlist__form {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.waitlist__input {
  flex: 1;
  padding: var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  font-size: var(--font-size-base);
}

.waitlist__input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.waitlist__input:focus {
  outline: none;
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
}

.waitlist__btn {
  background: var(--color-white);
  color: var(--color-secondary-dark);
  border: none;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-xl);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.waitlist__btn:hover {
  transform: scale(1.02);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer__brand p {
  color: var(--color-gray-400);
  margin-top: var(--space-3);
  max-width: 280px;
}

.footer__section h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-400);
  margin-bottom: var(--space-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  color: var(--color-gray-300);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-gray-800);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
}

.footer__copyright {
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Sticky CTA
   ========================================== */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) var(--space-5);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-gray-200);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.sticky-cta.is-visible {
  transform: translateY(0);
}

.sticky-cta__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
}

.sticky-cta__text {
  display: none;
}

.sticky-cta__text strong {
  display: block;
  color: var(--color-gray-800);
}

.sticky-cta__text span {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.sticky-cta .btn {
  width: 100%;
}

/* ==========================================
   Mobile Menu Overlay
   ========================================== */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: calc(var(--z-header) + 1);
  background: var(--color-white);
  padding: var(--space-20) var(--space-5);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-menu.is-open {
  transform: translateX(0);
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-gray-600);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-4);
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--color-gray-800);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
}

.mobile-menu__link:hover {
  background: var(--color-gray-100);
}

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

/* Tablet (768px and up) */
@media (min-width: 768px) {
  :root {
    --font-size-4xl: 2.75rem;
    --font-size-5xl: 3.5rem;
  }

  .container {
    padding: 0 var(--space-8);
  }

  .header__nav {
    display: block;
  }

  .header__menu-btn {
    display: none;
  }

  .hero {
    padding: calc(64px + var(--space-24)) 0 var(--space-24);
  }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

  .hero__actions {
    flex-direction: row;
    justify-content: center;
  }

  .section {
    padding: var(--space-24) 0;
  }

  .section__title {
    font-size: var(--font-size-4xl);
  }

  .problem__grid,
  .solution__grid,
  .privacy__grid,
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    gap: var(--space-12);
  }

  .lost-mode__features {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }

  .sticky-cta__inner {
    gap: var(--space-6);
  }

  .sticky-cta__text {
    display: block;
  }

  .sticky-cta .btn {
    width: auto;
  }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
  :root {
    --font-size-5xl: 4rem;
  }

  .hero__title {
    font-size: var(--font-size-6xl);
  }

  .solution__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .privacy__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .waitlist__form {
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* Large Desktop (1280px and up) */
@media (min-width: 1280px) {
  .steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
  }

  .step {
    flex-direction: column;
    text-align: center;
  }

  .step__number {
    margin: 0 auto var(--space-4);
  }
}

/* Print styles */
@media print {
  .header,
  .sticky-cta,
  .mobile-menu {
    display: none !important;
  }

  .section {
    padding: var(--space-8) 0;
  }
}