/* ==========================================================================
   Nikki Apps — Apple-inspired Design System
   Reference: Apple SF Pro / section-level theming / pill CTAs
   ========================================================================== */

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

:root {
  /* Base colors */
  --color-black: #000000;
  --color-near-black: #1d1d1f;
  --color-light-gray: #f5f5f7;
  --color-white: #ffffff;

  /* Interactive */
  --color-apple-blue: #0071e3;
  --color-link-blue: #0066cc;
  --color-bright-blue: #2997ff;

  /* Text shades */
  --color-text-soft: rgba(0, 0, 0, 0.8);
  --color-text-muted: rgba(0, 0, 0, 0.56);
  --color-text-tertiary: rgba(0, 0, 0, 0.48);

  /* Shadows */
  --shadow-card: rgba(0, 0, 0, 0.22) 3px 5px 30px 0px;

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-soft: cubic-bezier(0.25, 0.1, 0.25, 1);

  /* Layout */
  --container-width: 980px;
  --container-narrow: 692px;
  --nav-height: 48px;
}

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

body {
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont,
               "Helvetica Neue", "Hiragino Sans", "Yu Gothic", Arial, sans-serif;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.022em;
  color: var(--color-near-black);
  background: var(--color-white);
  font-feature-settings: "kern" 1, "liga" 1;
}

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

a {
  color: var(--color-link-blue);
  text-decoration: none;
  transition: color 0.2s var(--ease-out-soft);
}

a:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Section Theming — Apple's signature alternating black / light-gray rhythm
   -------------------------------------------------------------------------- */

.section {
  padding: 96px 0;
  position: relative;
}

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

.section--light {
  background: var(--color-light-gray);
  color: var(--color-near-black);
}

.section--white {
  background: var(--color-white);
  color: var(--color-near-black);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark p {
  color: var(--color-white);
}

.section--dark a {
  color: var(--color-bright-blue);
}

@media (max-width: 734px) {
  .section {
    padding: 64px 0;
  }
}

/* --------------------------------------------------------------------------
   Container
   -------------------------------------------------------------------------- */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 22px;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 22px;
}

/* --------------------------------------------------------------------------
   Navigation — translucent dark glass, always
   -------------------------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.nav-inner {
  max-width: 1024px;
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: -0.022em;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--color-white);
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 12px;
  font-weight: 400;
  color: var(--color-white);
  opacity: 0.88;
  letter-spacing: -0.01em;
  transition: opacity 0.2s var(--ease-out-soft);
}

.nav-links a:hover {
  opacity: 1;
  text-decoration: none;
}

@media (max-width: 640px) {
  .nav-links {
    gap: 18px;
  }
  .nav-links a {
    font-size: 11px;
  }
}

/* --------------------------------------------------------------------------
   Typography — based on Apple spec
   -------------------------------------------------------------------------- */

.display-hero {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.5px;
}

.display-section {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  letter-spacing: -0.3px;
}

.display-tile {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 28px;
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: 0.196px;
}

.subheading {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 21px;
  font-weight: 400;
  line-height: 1.19;
  letter-spacing: 0.231px;
}

.body-text {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
}

.body-emphasis {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.374px;
}

.caption {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--color-text-soft);
}

.section--dark .caption {
  color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 734px) {
  .display-hero {
    font-size: 40px;
    letter-spacing: -0.3px;
  }
  .display-section {
    font-size: 32px;
  }
  .display-tile {
    font-size: 24px;
  }
  .subheading {
    font-size: 19px;
  }
}

/* --------------------------------------------------------------------------
   Hero Module
   -------------------------------------------------------------------------- */

.hero {
  padding: 112px 0 88px;
  text-align: center;
}

.hero .eyebrow {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.43;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-bright-blue);
  margin-bottom: 14px;
}

.section--light .hero .eyebrow,
.section--white .hero .eyebrow {
  color: var(--color-link-blue);
}

.hero h1 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.hero .tagline {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 21px;
  font-weight: 400;
  line-height: 1.19;
  letter-spacing: 0.231px;
  max-width: 620px;
  margin: 0 auto 28px;
}

.section--dark .hero .tagline {
  color: rgba(255, 255, 255, 0.88);
}

.section--light .hero .tagline,
.section--white .hero .tagline {
  color: var(--color-text-soft);
}

.hero-cta {
  display: inline-flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  margin-top: 14px;
}

@media (max-width: 734px) {
  .hero {
    padding: 80px 0 64px;
  }
  .hero h1 {
    font-size: 40px;
    letter-spacing: -0.3px;
  }
  .hero .tagline {
    font-size: 19px;
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.022em;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: all 0.2s var(--ease-out-soft);
}

.btn:hover {
  text-decoration: none;
}

/* Primary solid — the "Buy" button */
.btn-primary {
  background: var(--color-apple-blue);
  color: var(--color-white);
  padding: 12px 22px;
  border-radius: 980px;
  min-height: 44px;
}

.btn-primary:hover {
  background: #0077ed;
  color: var(--color-white);
}

/* Pill link — the "Learn more" capsule */
.btn-pill {
  background: transparent;
  padding: 12px 22px;
  border-radius: 980px;
  min-height: 44px;
}

.section--dark .btn-pill {
  color: var(--color-bright-blue);
  border-color: var(--color-bright-blue);
}

.section--light .btn-pill,
.section--white .btn-pill {
  color: var(--color-link-blue);
  border-color: var(--color-link-blue);
}

.section--dark .btn-pill:hover {
  background: var(--color-bright-blue);
  color: var(--color-black);
}

.section--light .btn-pill:hover,
.section--white .btn-pill:hover {
  background: var(--color-link-blue);
  color: var(--color-white);
}

/* Inline learn-more link — the chevron pattern */
.learn-more {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.022em;
  color: var(--color-link-blue);
  transition: gap 0.3s var(--ease-out-expo);
}

.section--dark .learn-more {
  color: var(--color-bright-blue);
}

.learn-more::after {
  content: "\203A";
  font-size: 1.1em;
  line-height: 1;
  display: inline-block;
  transform: translateY(-1px);
  transition: transform 0.3s var(--ease-out-expo);
}

.learn-more:hover {
  text-decoration: none;
  gap: 6px;
}

.learn-more:hover::after {
  transform: translate(2px, -1px);
}

/* --------------------------------------------------------------------------
   App Grid (on index)
   -------------------------------------------------------------------------- */

.section-heading {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  letter-spacing: -0.3px;
  text-align: center;
  margin-bottom: 14px;
}

.section-lede {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 21px;
  font-weight: 400;
  line-height: 1.19;
  letter-spacing: 0.231px;
  text-align: center;
  margin-bottom: 56px;
  color: var(--color-text-soft);
}

.section--dark .section-heading,
.section--dark .section-lede {
  color: var(--color-white);
}

.section--dark .section-lede {
  color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 734px) {
  .section-heading {
    font-size: 32px;
  }
  .section-lede {
    font-size: 19px;
    margin-bottom: 40px;
  }
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (max-width: 734px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
}

.app-tile {
  display: flex;
  flex-direction: column;
  padding: 52px 40px;
  border-radius: 18px;
  background: var(--color-white);
  color: var(--color-near-black);
  text-decoration: none;
  min-height: 420px;
  position: relative;
  overflow: hidden;
  transition: transform 0.5s var(--ease-out-expo);
}

.app-tile:hover {
  text-decoration: none;
  transform: translateY(-2px);
  color: var(--color-near-black);
}

.section--dark .app-tile {
  background: #161617;
  color: var(--color-white);
}

.section--dark .app-tile:hover {
  color: var(--color-white);
}

.app-tile-eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
  color: var(--color-link-blue);
}

.section--dark .app-tile-eyebrow {
  color: var(--color-bright-blue);
}

.app-tile-title {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 32px;
  font-weight: 600;
  line-height: 1.10;
  letter-spacing: -0.2px;
  margin-bottom: 8px;
}

.app-tile-tagline {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 19px;
  font-weight: 400;
  line-height: 1.21;
  letter-spacing: 0.012em;
  color: var(--color-text-soft);
  margin-bottom: 32px;
  max-width: 28ch;
}

.section--dark .app-tile-tagline {
  color: rgba(255, 255, 255, 0.72);
}

.app-tile-cta {
  margin-top: auto;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 734px) {
  .app-tile {
    padding: 40px 28px;
    min-height: 340px;
  }
  .app-tile-title {
    font-size: 28px;
  }
  .app-tile-tagline {
    font-size: 17px;
  }
}

/* --------------------------------------------------------------------------
   Feature Grid (product pages)
   -------------------------------------------------------------------------- */

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 0;
}

@media (max-width: 734px) {
  .features {
    grid-template-columns: 1fr;
  }
}

.feature {
  padding: 40px 32px;
  border-radius: 18px;
  background: var(--color-white);
  min-height: 240px;
  display: flex;
  flex-direction: column;
}

.section--dark .feature {
  background: #161617;
}

.feature-eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-link-blue);
  margin-bottom: 8px;
}

.section--dark .feature-eyebrow {
  color: var(--color-bright-blue);
}

.feature h3 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.17;
  letter-spacing: -0.15px;
  margin-bottom: 8px;
}

.feature p {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.24px;
  color: var(--color-text-soft);
}

.section--dark .feature h3 {
  color: var(--color-white);
}

.section--dark .feature p {
  color: rgba(255, 255, 255, 0.72);
}

/* --------------------------------------------------------------------------
   Privacy Page
   -------------------------------------------------------------------------- */

.privacy {
  padding: 88px 0 120px;
  background: var(--color-light-gray);
}

.privacy-header {
  margin-bottom: 44px;
}

.privacy-eyebrow {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-link-blue);
  margin-bottom: 10px;
}

.privacy h1 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  letter-spacing: -0.3px;
  color: var(--color-near-black);
  margin-bottom: 8px;
}

.privacy .updated {
  font-size: 14px;
  color: var(--color-text-tertiary);
  letter-spacing: -0.224px;
}

.privacy h2 {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.15px;
  margin-top: 40px;
  margin-bottom: 12px;
  color: var(--color-near-black);
}

.privacy p,
.privacy li {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.58;
  letter-spacing: -0.374px;
  color: var(--color-text-soft);
  margin-bottom: 12px;
}

.privacy ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

.privacy li {
  margin-bottom: 6px;
}

.privacy strong {
  color: var(--color-near-black);
  font-weight: 600;
}

@media (max-width: 734px) {
  .privacy {
    padding: 64px 0 88px;
  }
  .privacy h1 {
    font-size: 32px;
  }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  padding: 32px 0;
  background: var(--color-light-gray);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer p,
.footer a {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--color-text-muted);
}

.footer a:hover {
  color: var(--color-near-black);
  text-decoration: none;
}

.footer-links {
  display: flex;
  gap: 22px;
  list-style: none;
}

/* --------------------------------------------------------------------------
   Reveal-on-scroll
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease-out-expo),
              transform 0.7s var(--ease-out-expo);
}

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

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