/* ========================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ======================================== */

/* ========================================
   TABLET (768px and up)
   ======================================== */

@media (min-width: 768px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    padding: var(--spacing-2xl) var(--spacing-2xl);
    min-height: auto;
    gap: var(--spacing-2xl);
  }

  .hero__content {
    text-align: left;
    margin: 0;
  }

  .hero__logo {
    margin-bottom: var(--spacing-2xl);
  }

  .hero__title {
    font-size: 3rem;
  }

  .hero__cta {
    justify-content: flex-start;
  }

  .hero__image-wrapper {
    height: 500px;
  }

  /* Book Details */
  .book-details__container {
    grid-template-columns: 1fr 1fr;
  }

  .specs-grid {
    grid-template-columns: 1fr;
  }

  .highlights {
    grid-template-columns: 1fr;
  }

  /* Timeline */
  .timeline__content {
    grid-template-columns: repeat(3, 1fr);
  }

  .timeline-item {
    padding: var(--spacing-lg);
  }
}

/* ========================================
   SMALL LAPTOP (1024px and up)
   ======================================== */

@media (min-width: 1024px) {
  body {
    font-size: 1.0625rem;
  }

  h1 {
    font-size: 3.5rem;
  }

  h2 {
    font-size: 2.75rem;
  }

  .hero {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-3xl);
    align-items: center;
    min-height: 90vh;
  }

  .hero__title {
    font-size: 3.5rem;
  }

  .hero__image-wrapper {
    height: 600px;
  }

  /* Book Details */
  .book-details {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }

  .book-details__container {
    gap: var(--spacing-3xl);
  }

  .specs-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }

  .highlights {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  /* Timeline */
  .timeline {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }

  .timeline__content {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
  }
}

/* ========================================
   DESKTOP (1280px and up)
   ======================================== */

@media (min-width: 1280px) {
  .hero {
    gap: var(--spacing-lg);
    padding: var(--spacing-3xl) var(--spacing-3xl);
  }

  .hero__image-wrapper {
    height: 700px;
  }

  .book-details__container {
    max-width: 1400px;
    gap: var(--spacing-3xl);
  }

  .specs-grid {
    grid-template-columns: 1fr 1fr;
  }

  /* Button Hover Effects */
  .button {
    position: relative;
    overflow: hidden;
  }

  .button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
  }

  .button:hover::before {
    width: 300px;
    height: 300px;
  }
}

/* ========================================
   LARGE DESKTOP (1920px and up)
   ======================================== */

@media (min-width: 1920px) {
  .hero {
    padding: var(--spacing-3xl) 10%;
  }

  .book-details {
    padding: var(--spacing-3xl) 10%;
  }

  .book-details__container {
    max-width: 1600px;
  }

  .timeline {
    padding: var(--spacing-3xl) 10%;
  }

  .footer {
    padding: var(--spacing-2xl) 10%;
  }
}

/* ========================================
   SMALL SCREENS (Below 768px)
   ======================================== */

@media (max-width: 767px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: var(--font-size-lg);
  }

  .hero {
    grid-template-columns: 1fr;
    padding: var(--spacing-2xl) var(--spacing-md);
    gap: var(--spacing-2xl);
    min-height: 100vh;
  }

  .hero__content {
    text-align: center;
    order: 1;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .hero__cta {
    justify-content: center;
    gap: var(--spacing-sm);
  }

  .button {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }

  .button--large {
    width: 100%;
  }

  .hero__image-wrapper {
    order: 2;
    height: 300px;
  }

  /* Book Details */
  .book-details {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .book-details__container {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .book-details__specs {
    order: 1;
  }

  .book-details__description {
    order: 2;
  }

  .specs-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .spec-card {
    aspect-ratio: 1 / 1;
  }

  .highlights {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .highlight-item {
    padding-left: var(--spacing-md);
  }

  .book-details__text {
    font-size: var(--font-size-base);
  }

  /* Timeline */
  .timeline {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .timeline__content {
    grid-template-columns: 1fr;
    gap: 6rem;
  }

  .timeline-item {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .timeline-item:first-child::after,
  .timeline-item--active::after {
    top: auto;
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item:first-child::after{
    bottom: -73px;
  }

  .timeline-item--active::after {
    bottom: -99px;
  }

  /* Footer */
  .footer {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .footer__text {
    font-size: var(--font-size-sm);
  }
}

/* ========================================
   PORTRAIT ORIENTATION (Tablets)
   ======================================== */

@media (max-width: 900px) and (orientation: portrait) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero__image-wrapper {
    height: 350px;
  }
}

/* ========================================
   LANDSCAPE ORIENTATION (Small screens)
   ======================================== */

@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: var(--spacing-lg);
  }

  .hero__image-wrapper {
    height: 250px;
  }
}

/* ========================================
   HIGH DPI / RETINA SCREENS
   ======================================== */

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  /* Potentially sharper fonts and images */
  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  .hero__cta,
  .footer {
    display: none;
  }

  .page {
    background: white;
  }

  body {
    color: black;
  }
}

/* ========================================
   REDUCED MOTION
   ======================================== */

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

/* ========================================
   DARK MODE (if supported)
   ======================================== */

@media (prefers-color-scheme: dark) {
  :root {
    --color-light: #2a2a2a;
    --color-white: #1a1a1a;
    --color-text: #e0e0e0;
    --color-text-light: #aaaaaa;
    --color-border: #404040;
  }

  body {
    background-color: var(--color-white);
    color: var(--color-text);
  }
}