/* ============================================
   Snuffy Rhino — Apple-inspired design system
   ============================================ */

:root {
  --color-bg: #FBFBFD;
  --color-bg-alt: #F5F5F7;
  --color-text: #1D1D1F;
  --color-text-secondary: #86868B;
  --color-accent: #0066CC;
  --color-accent-hover: #0051A3;
  --color-divider: #D2D2D7;
  --color-dark-bg: #000000;
  --color-dark-bg-alt: #161617;
  --color-dark-text: #F5F5F7;
  --color-dark-secondary: #A1A1A6;

  --font-display: -apple-system, "SF Pro Display", "Inter", "Segoe UI", system-ui, sans-serif;
  --font-body: -apple-system, "SF Pro Text", "Inter", "Segoe UI", system-ui, sans-serif;

  --nav-height: 52px;
  --section-pad-y: 140px;
  --section-pad-y-mobile: 72px;

  --ease-apple: cubic-bezier(0.42, 0, 0.58, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.01em;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s var(--ease-apple);
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 0;
}

.eyebrow {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  display: block;
}

.display-headline {
  font-size: clamp(40px, 6vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.section-headline {
  font-size: clamp(32px, 4.5vw, 56px);
  font-weight: 700;
  line-height: 1.07;
}

.body-large {
  font-size: clamp(19px, 2vw, 28px);
  font-weight: 400;
  line-height: 1.25;
  color: var(--color-text-secondary);
}

.text-secondary {
  color: var(--color-text-secondary);
}

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

.navbar-apple {
  height: var(--nav-height);
  background-color: rgba(251, 251, 253, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color 0.3s var(--ease-apple);
}

.navbar-apple .navbar-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--color-text);
  text-transform: uppercase;
}

.navbar-apple .nav-link {
  font-size: 12px;
  color: var(--color-text);
  font-weight: 400;
  padding: 0 16px !important;
  opacity: 0.85;
}

.navbar-apple .nav-link:hover,
.navbar-apple .nav-link.active {
  opacity: 1;
}

.navbar-apple .navbar-toggler {
  border: none;
  padding: 0;
}

.navbar-apple .navbar-toggler:focus {
  box-shadow: none;
}

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

.btn-apple {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 17px;
  color: var(--color-accent);
  font-weight: 400;
  padding: 0;
  border: none;
  background: none;
}

.btn-apple::after {
  content: '›';
  font-weight: 400;
  transition: transform 0.2s var(--ease-apple);
}

.btn-apple:hover::after {
  transform: translateX(2px);
}

.btn-pill {
  display: inline-block;
  background-color: var(--color-accent);
  color: #fff;
  border-radius: 980px;
  padding: 12px 24px;
  font-size: 17px;
  font-weight: 400;
  transition: background-color 0.2s var(--ease-apple);
  border: none;
}

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

.btn-pill-outline {
  display: inline-block;
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-divider);
  border-radius: 980px;
  padding: 12px 24px;
  font-size: 17px;
  font-weight: 400;
  transition: all 0.2s var(--ease-apple);
}

.btn-pill-outline:hover {
  background-color: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

/* ============================================
   Sections
   ============================================ */

.section {
  padding: var(--section-pad-y) 0;
}

@media (max-width: 767px) {
  .section {
    padding: var(--section-pad-y-mobile) 0;
  }
}

.section-dark {
  background-color: var(--color-dark-bg);
  color: var(--color-dark-text);
}

.section-dark .text-secondary,
.section-dark .body-large {
  color: var(--color-dark-secondary);
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.hero {
  padding: 180px 0 100px;
  text-align: center;
}

@media (max-width: 767px) {
  .hero {
    padding: 120px 0 60px;
  }
}

.hero-tagline {
  max-width: 640px;
  margin: 20px auto 32px;
}

/* ============================================
   Product / Card Grid (signature element)
   ============================================ */

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (max-width: 767px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

.product-card {
  background-color: var(--color-bg-alt);
  border-radius: 18px;
  padding: 48px 40px;
  text-align: center;
  transition: transform 0.35s var(--ease-apple), box-shadow 0.35s var(--ease-apple);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--color-text);
  height: 100%;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
  color: var(--color-text);
}

.product-card .icon-wrap {
  width: 96px;
  height: 96px;
  margin-bottom: 24px;
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.product-card .icon-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.product-card h3 {
  font-size: 26px;
  margin-bottom: 6px;
}

.product-card p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

/* ============================================
   App / Book detail cards
   ============================================ */

.app-feature {
  padding: 100px 0;
  border-bottom: 1px solid var(--color-divider);
}

.app-feature:last-child {
  border-bottom: none;
}

.app-icon-large {
  width: 140px;
  height: 140px;
  border-radius: 30px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15);
  margin-bottom: 32px;
}

.feature-pill-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.feature-pill-list li {
  background-color: var(--color-bg-alt);
  border-radius: 980px;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--color-text);
}

.app-store-badge {
  height: 48px;
  display: inline-block;
}

/* ============================================
   Book cards
   ============================================ */

.book-card {
  background-color: var(--color-bg-alt);
  border-radius: 18px;
  overflow: hidden;
  transition: transform 0.35s var(--ease-apple), box-shadow 0.35s var(--ease-apple);
  height: 100%;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.1);
}

.book-cover-wrap {
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background-color: #e8e8ed;
}

.book-cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-card-body {
  padding: 24px 24px 28px;
}

.book-card-body h3 {
  font-size: 21px;
  margin-bottom: 4px;
}

.book-card-body .book-author {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.book-card-body p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 18px;
}

.amazon-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-accent);
}

/* ============================================
   Scroll reveal
   ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-apple), transform 0.7s var(--ease-apple);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

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

.footer-apple {
  background-color: var(--color-bg-alt);
  padding: 56px 0 32px;
  font-size: 12px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-divider);
}

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

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

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-heading {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 14px;
}

.footer-divider {
  border-color: var(--color-divider);
  margin: 24px 0 16px;
}

.social-icons a {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: rgba(0,0,0,0.06);
  margin-right: 8px;
  color: var(--color-text);
}

.social-icons a:hover {
  background-color: var(--color-text);
  color: #fff;
}

/* ============================================
   About page
   ============================================ */

.portrait-frame {
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0,0,0,0.12);
}

/* ============================================
   Contact form
   ============================================ */

.form-control-apple {
  border: 1px solid var(--color-divider);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 16px;
  background-color: #fff;
  transition: border-color 0.2s var(--ease-apple), box-shadow 0.2s var(--ease-apple);
}

.form-control-apple:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
  outline: none;
}

label.form-label-apple {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
}