/* ==========================================================================
   pHinder - Marketing Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   Variables
   -------------------------------------------------------------------------- */
:root {
  --color-black: #0a0a0a;
  --color-white: #ffffff;
  --color-gray-light: #f5f5f7;
  --color-gray-mid: #86868b;
  --color-gray-dark: #1d1d1f;
  --color-accent: #007AFF;
  --color-accent-dark: #0056B3;
  
  --font-family-base: -apple-system, "SF Pro Display", "SF Pro Text", "Inter", "Helvetica Neue", Arial, sans-serif;
  
  --spacing-section-desktop: 8rem;
  --spacing-section-mobile: 4rem;
  
  --border-radius-sm: 12px;
  --border-radius-md: 18px;
  --border-radius-lg: 32px;
  
  --shadow-subtle: 0 20px 60px rgba(0, 0, 0, 0.08);
  
  --transition-fast: 200ms ease;
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

button {
  border: none;
  background: none;
  font-family: inherit;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 6rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

p {
  font-size: 1.125rem;
  color: var(--color-gray-mid);
}

/* --------------------------------------------------------------------------
   Layout & Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: var(--spacing-section-desktop) 0;
}

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

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

.section--dark p {
  color: var(--color-gray-mid);
}

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

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px) scale(0.98);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.05rem;
  transition: all var(--transition-fast);
}

.btn:hover {
  transform: scale(1.03);
}

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

.btn--primary:hover {
  background-color: var(--color-accent-dark);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn--secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: background var(--transition-fast);
}

.navbar--dark {
  background: rgba(10, 10, 10, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-white);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.navbar__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.navbar__logo span {
  color: var(--color-accent);
}

.navbar__links {
  display: flex;
  gap: 2rem;
}

.navbar__link {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.navbar__link:hover {
  opacity: 1;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 24px;
  height: 24px;
  justify-content: center;
}

.navbar__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transition: all var(--transition-fast);
}

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 4rem;
  left: 0;
  width: 100%;
  height: calc(100vh - 4rem);
  background: var(--color-white);
  padding: 2rem;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-smooth);
  z-index: 999;
}

.mobile-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav__links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.navbar--dark .mobile-nav {
  background: var(--color-black);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 6rem;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto 4rem auto;
}

.hero__subtitle {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: var(--color-gray-mid);
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__bg-glow {
  position: absolute;
  top: 60%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80vw;
  height: 80vw;
  max-width: 800px;
  max-height: 800px;
  background: radial-gradient(circle, rgba(198, 255, 30, 0.15) 0%, rgba(10, 10, 10, 0) 70%);
  z-index: 0;
}

/* --------------------------------------------------------------------------
   Overview Section
   -------------------------------------------------------------------------- */
.overview__stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 4rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  max-width: 200px;
}

.stat-item svg {
  width: 48px;
  height: 48px;
  color: var(--color-accent-dark);
  margin-bottom: 1rem;
}

.stat-item h4 {
  margin-bottom: 0.5rem;
}

.stat-item p {
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  margin-top: 4rem;
}

.feature-card {
  background: var(--color-white);
  padding: 2.5rem;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-card svg {
  width: 32px;
  height: 32px;
  color: var(--color-accent-dark);
  margin-bottom: 1.5rem;
}

.feature-spotlight {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  margin-top: 6rem;
  background: var(--color-black);
  color: var(--color-white);
  padding: 4rem;
  border-radius: var(--border-radius-lg);
}

.feature-spotlight p {
  color: var(--color-gray-mid);
  margin-bottom: 2rem;
}

/* --------------------------------------------------------------------------
   Gallery Section (Carousel)
   -------------------------------------------------------------------------- */
.gallery {
  position: relative;
  padding-bottom: 2rem;
}

.carousel {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
  gap: 3rem;
  padding: 2rem 50vw; /* Center items hack */
}

.carousel::-webkit-scrollbar {
  display: none; /* Safari/Chrome */
}

.carousel__item {
  scroll-snap-align: center;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.carousel__item .iphone-mockup {
  width: 240px;
}

.carousel__caption {
  margin-top: 1.5rem;
  font-weight: 500;
  color: var(--color-gray-mid);
}

.carousel-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  margin-top: 2rem;
}

.carousel-nav__btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.carousel-nav__btn:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.carousel-nav__dots {
  display: flex;
  gap: 0.5rem;
}

.carousel-nav__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: background var(--transition-fast);
}

.carousel-nav__dot.is-active {
  background: var(--color-accent);
  transform: scale(1.2);
}

/* --------------------------------------------------------------------------
   How It Works Section
   -------------------------------------------------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 4rem;
}

.step {
  text-align: left;
}

.step__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

/* --------------------------------------------------------------------------
   Why pHinder Section
   -------------------------------------------------------------------------- */
.why-section {
  text-align: center;
}

.why-section h2 {
  max-width: 800px;
  margin: 0 auto 4rem auto;
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.3;
}

.why-stats {
  display: flex;
  justify-content: center;
  gap: 4rem;
  flex-wrap: wrap;
}

.why-stat {
  display: flex;
  flex-direction: column;
}

.why-stat__number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.why-stat__label {
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Download CTA
   -------------------------------------------------------------------------- */
.cta-section {
  background: linear-gradient(180deg, var(--color-black) 0%, var(--color-gray-dark) 100%);
  text-align: center;
}

.qr-placeholder {
  width: 150px;
  height: 150px;
  border: 2px dashed rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  margin: 2rem auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-mid);
}

/* --------------------------------------------------------------------------
   FAQ Section
   -------------------------------------------------------------------------- */
.faq {
  max-width: 800px;
  margin: 4rem auto 0;
}

.faq details {
  background: var(--color-white);
  border-radius: var(--border-radius-md);
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}

.faq summary {
  padding: 1.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  color: var(--color-gray-dark);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--color-accent-dark);
  transition: transform var(--transition-fast);
}

.faq details[open] summary::after {
  content: '−';
}

.faq__content {
  padding: 0 1.5rem 1.5rem 1.5rem;
  color: var(--color-gray-mid);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--color-black);
  color: var(--color-gray-mid);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 4rem;
}

.footer__brand .navbar__logo {
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer h4 {
  color: var(--color-white);
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: 0.75rem;
}

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

.footer__socials {
  display: flex;
  gap: 1rem;
}

.footer__socials svg {
  width: 24px;
  height: 24px;
}

.footer__bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   iPhone Mockup Component (Pure CSS)
   -------------------------------------------------------------------------- */
.iphone-mockup {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 19.5;
  background: var(--color-black);
  border-radius: 48px;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.15), 0 30px 60px rgba(0,0,0,0.3);
  padding: 12px;
  z-index: 10;
}

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

.hero .iphone-mockup {
  width: clamp(220px, 28vw, 340px);
  animation: float 4s ease-in-out infinite;
  margin: 0 auto;
}

.iphone-mockup__notch {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 30%;
  height: 25px;
  background: var(--color-black);
  border-radius: 20px;
  z-index: 20;
}

.iphone-mockup__screen {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 36px;
  overflow: hidden;
  background: var(--color-gray-light);
}

.iphone-mockup__screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 2;
}

.iphone-mockup__placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-light);
  color: var(--color-gray-mid);
  text-align: center;
  padding: 1rem;
  z-index: 1;
}

.iphone-mockup__placeholder svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-spotlight {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 3rem 2rem;
  }
  
  .feature-spotlight .iphone-mockup {
    margin: 0 auto;
    width: 280px;
  }
  
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: var(--spacing-section-mobile) 0;
  }
  
  .navbar__links, .navbar__actions .btn {
    display: none;
  }
  
  .navbar__toggle {
    display: flex;
  }
  
  .steps {
    grid-template-columns: 1fr;
  }
  
  .why-stats {
    flex-direction: column;
    gap: 2rem;
  }
  
  .footer__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer__socials {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero {
    padding-top: 8rem;
  }
  
  .iphone-mockup {
    border-radius: 40px;
    padding: 10px;
  }
  
  .iphone-mockup__screen {
    border-radius: 30px;
  }
  
  .hero .iphone-mockup {
    width: 220px;
  }
}