:root {
  --bg-page: #ffffff;
  --bg-surface: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --brand-red: #d30501;
  --brand-red-hover: #b00401;
  --brand-red-soft: rgba(211, 5, 1, 0.08);
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* =========================================
   1. ANIMASI LOADING MODERN ROTTHERDAMS
   ========================================= */
#loader-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  background: var(--bg-page);
  transition: opacity 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              visibility 0.45s ease;
}

#loader-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-brand {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pulse-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--brand-red);
  animation: pulseRing 1.6s cubic-bezier(0.22, 1, 0.36, 1) infinite;
}

.loader-icon {
  width: 34px;
  height: 34px;
  object-fit: contain;
  animation: iconBreath 1.6s ease-in-out infinite;
}

.loader-bar-track {
  width: 160px;
  height: 3px;
  background: #f1f5f9;
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.loader-bar-fill {
  position: absolute;
  top: 0;
  left: -45%;
  width: 45%;
  height: 100%;
  background: var(--brand-red);
  border-radius: 999px;
  animation: barSlide 1.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

#loader-text {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

@keyframes pulseRing {
  0% {
    transform: scale(0.75);
    opacity: 0.75;
  }
  100% {
    transform: scale(1.45);
    opacity: 0;
  }
}

@keyframes iconBreath {
  0%, 100% { transform: scale(0.95); }
  50% { transform: scale(1.05); }
}

@keyframes barSlide {
  0% { left: -45%; }
  100% { left: 100%; }
}

.df-loading {
  background: rgba(255, 255, 255, 0.92) !important;
  backdrop-filter: blur(8px);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color) !important;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08) !important;
  border-radius: 999px !important;
  padding: 8px 18px !important;
  font-family: 'Plus Jakarta Sans', sans-serif !important;
  font-size: 12.5px !important;
  font-weight: 600 !important;
}

/* =========================================
   2. FLIPBOOK VIEWPORT (ULTRA-SMOOTH TRANSITION)
   ========================================= */
#flipbook-viewport {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  background: #f4f5f7;
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translate3d(0, 14px, 0) scale(0.99);
  will-change: opacity, transform;
  transition: opacity 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              visibility 0.45s ease;
}

#flipbook-viewport.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate3d(0, 0, 0) scale(1);
}

#flipbook-container {
  width: 100%;
  height: 100%;
  touch-action: none;
}

/* Mode Fullscreen Bersih Khusus Link yang Dibagikan (?doc=ID): Sembunyikan bilah tombol bawah */
#flipbook-viewport.is-clean-fullscreen .df-ui-controls {
  display: none !important;
}

/* Tombol Kembali */
#btn-back {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 9999;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.08);
  padding: 9px 16px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1),
              border-color 0.2s ease,
              color 0.2s ease,
              box-shadow 0.2s ease;
}

#btn-back:hover {
  border-color: var(--brand-red);
  color: var(--brand-red);
  transform: translateX(-3px);
  box-shadow: 0 4px 14px rgba(211, 5, 1, 0.12);
}

#btn-back:active {
  transform: translateX(-1px) scale(0.98);
}

/* =========================================
   3. MODE DAFTAR PILIHAN (DIRECTORY)
   ========================================= */
#directory-view {
  display: none;
  min-height: 100vh;
  background: var(--bg-surface);
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  will-change: opacity, transform;
  transition: opacity 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

#directory-view.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.topbar {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  border-top: 4px solid var(--brand-red);
  padding: 16px 24px;
}

.topbar-inner {
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand-logo img {
  height: 32px;
  width: auto;
  display: block;
}

.doc-badge {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--brand-red);
  background: var(--brand-red-soft);
  padding: 6px 12px;
  border-radius: 999px;
}

.main-container {
  max-width: 1060px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.section-heading {
  margin-bottom: 28px;
}

.section-heading h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.section-heading p {
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-secondary);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 22px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1),
              border-color 0.2s ease,
              box-shadow 0.25s ease;
}

.card:hover {
  border-color: var(--brand-red);
  box-shadow: 0 10px 24px rgba(211, 5, 1, 0.08);
  transform: translateY(-2px);
}

.card-meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-primary);
}

/* Grup Tombol Aksi pada Kartu (Buka + Share Link) */
.card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-open {
  flex: 1;
  padding: 11px 16px;
  background: var(--brand-red);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
  text-align: center;
}

.btn-open:hover {
  background: var(--brand-red-hover);
}

.btn-share {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-share:hover {
  border-color: var(--brand-red);
  color: var(--brand-red);
  background: var(--brand-red-soft);
}

.btn-share.is-copied {
  border-color: #16a34a;
  color: #16a34a;
  background: rgba(22, 163, 74, 0.08);
}

/* Toast Notifikasi Salin Link */
#toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translate(-50%, 20px);
  z-index: 10000;
  background: #0f172a;
  color: #ffffff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.25s ease;
}

#toast-notification.is-shown {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* =========================================
   4. RESPONSIVE MOBILE VIEW (<= 768px)
   ========================================= */
@media (max-width: 768px) {
  #btn-back {
    top: 12px;
    left: 12px;
    padding: 7px 13px;
    font-size: 12.5px;
  }

  .df-ui-controls {
    height: 44px !important;
    padding: 0 6px !important;
  }

  .df-ui-btn {
    width: 34px !important;
    height: 34px !important;
    font-size: 14px !important;
  }

  .df-ui-next,
  .df-ui-prev {
    width: 32px !important;
    height: 44px !important;
    font-size: 18px !important;
  }
}