/* ==========================================================================
   K-POP Timeline - Responsive Styles
   ========================================================================== */

/* ===== Tablet (768px - 1024px) ===== */
@media (max-width: 1024px) {
  :root {
    --artwork-size: 160px;
    --grid-gap: 1rem;
  }

  /* Adjust grid for tablet */
  .timeline__year {
    grid-template-columns: repeat(12, 1fr);
  }

  .timeline__year-marker {
    grid-column: 1 / 4;
  }

  .timeline__tracks {
    grid-column: 4 / 12;
  }

  .timeline__year-text {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }
}

/* ===== Mobile (max-width: 768px) ===== */
@media (max-width: 768px) {
  :root {
    --artwork-size: var(--artwork-size-mobile);
    --grid-padding: 1.5rem;
    --spacing-section: 3rem;
  }

  /* Hero adjustments */
  .hero__title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero__description {
    font-size: 1.125rem;
  }

  /* Stack layout on mobile */
  .timeline__year {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .timeline__year-marker {
    position: sticky;
    top: calc(44px + 1rem); /* バナー高さ + 余白 */
    padding-left: 0;
    margin-top: -2em;
    margin-bottom: 1.5em;
    z-index: var(--z-year-marker);
  }

  .timeline__year-text {
    font-size: 1.75rem;
  }

  /* Full-width divider line */
  .timeline__year::before {
    left: 0;
    right: 0;
  }

  .timeline__tracks {
    gap: var(--spacing-2xl);
  }

  /* PREFACE section mobile layout */
  .timeline__preface {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .preface__marker {
    position: relative;
    top: 0;
    padding-left: 0;
  }

  .preface__marker-text {
    font-size: 1.75rem;
  }

  .preface__title {
    font-size: 1.5rem;
  }

  .preface__body {
    font-size: 1.0625rem;
    line-height: 1.9;
  }

  /* Card adjustments */
  .track-card {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  /* Center artwork and make it larger */
  .track-card__artwork-container {
    max-width: 280px;
    width: 100%;
    margin: 0 auto;
  }

  .track-card__title-ja {
    font-size: 1.375rem;
  }

  .track-card__title-ko {
    font-size: 1.125rem;
  }

  .track-card__artist-ja {
    font-size: 1.125rem;
  }

  .track-card__artist-ko {
    font-size: 1rem;
  }

  /* Center text and links on mobile */
  .track-card__info {
    text-align: center;
  }

  .track-card__links {
    justify-content: center;
  }

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

  /* Mobile hint banner - enable on mobile */
  .mobile-hint-banner {
    display: flex;
  }

  /* Event banner responsive */
  .event-banner__label {
    left: var(--spacing-sm);
  }

  .event-banner__content {
    padding: var(--spacing-md);
    padding-top: calc(var(--spacing-md) + 0.5rem);
  }

  /* Stack date and title on mobile */
  .event-banner__headline {
    display: flex;
    flex-direction: column;
  }

  .event-banner__date {
    font-size: 1rem;
    margin-right: 0;
    margin-bottom: 2px;
  }

  .event-banner__title {
    font-size: 1rem;
  }

  .event-banner__venue {
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
  }

  .event-banner__cta {
    font-size: 0.6875rem;
  }
}

/* ===== Small Mobile (max-width: 480px) ===== */
@media (max-width: 480px) {
  :root {
    --grid-padding: 1.25rem;
    --spacing-lg: 1rem;
  }

  .hero__content {
    padding: var(--spacing-md);
  }

  .hero__description {
    font-size: 1.0625rem;
  }

  .hero__years {
    letter-spacing: 0.15em;
  }

  .timeline__year-text {
    font-size: 1.5rem;
  }

  /* PREFACE section small mobile */
  .preface__marker-text {
    font-size: 1.5rem;
  }

  .preface__title {
    font-size: 1.375rem;
  }

  .preface__body {
    font-size: 1rem;
    line-height: 1.85;
  }

  .track-card__title-ja {
    font-size: 1.25rem;
  }

  .track-card__title-ko {
    font-size: 1rem;
  }

  .track-card__artist-ja {
    font-size: 1.0625rem;
  }

  .track-card__artist-ko {
    font-size: 0.9375rem;
  }

  /* Event banner small mobile */
  .event-banner__content {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-top: calc(var(--spacing-sm) + 0.5rem);
  }

  .event-banner__label {
    top: var(--spacing-xs);
  }

  .event-banner__date {
    font-size: 0.9375rem;
  }

  .event-banner__title {
    font-size: 0.9375rem;
  }

  .event-banner__venue {
    font-size: 0.9375rem;
  }
}

/* ===== Large Desktop (min-width: 1400px) ===== */
@media (min-width: 1400px) {
  :root {
    --max-width-content: 1400px;
    --artwork-size: 240px;
    --max-width-card: 800px;
  }

  .timeline__year-text {
    font-size: 3rem;
  }
}

/* ===== Print Styles ===== */
@media print {
  .hero__scroll-hint,
  .track-card__play-overlay,
  .loading {
    display: none !important;
  }

  .track-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* ===== High Contrast Mode ===== */
@media (prefers-contrast: high) {
  :root {
    --color-accent-primary: #CC0000;
    --color-text-secondary: #333333;
    --shadow-card: 0 0 0 2px var(--color-text-primary);
  }

  .track-card:focus-visible {
    outline: 3px solid var(--color-accent-primary);
  }
}

/* ===== Touch Device Optimizations ===== */
@media (hover: none) and (pointer: coarse) {
  .track-card:hover {
    transform: none;
  }

  /* Spotify/YouTube icons - larger tap target */
  .track-card__link:not(.track-card__link--apple-badge) {
    width: 44px;
    height: 44px;
  }

  .track-card__link svg {
    width: 20px;
    height: 20px;
  }

  /* Apple Music badge - keep original proportions */
  .track-card__link--apple-badge {
    width: auto;
    height: 40px;
    padding: 0 12px;
  }

  /* Back to top button - match YouTube button size */
  .back-to-top {
    width: 44px;
    height: 44px;
    right: 16px;
    bottom: 16px;
  }
}