/* Landing layout: sidebar + grid */
.landing-layout {
  display: flex;
  padding: 0 32px 32px;
  gap: 32px;
  min-height: calc(100vh - 180px);
}

/* Sidebar */
.sidebar {
  flex-shrink: 0;
  width: var(--width-sidebar);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 0 2px;
  border-radius: 16px;
  position: sticky;
  top: var(--sticky-top-sidebar);
  align-self: flex-start;
}


.filters {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 32px 0;
}

.filter-clear {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  color: var(--color-gray-5);
  transition: color 0.2s;
}

.filter-clear:hover {
  color: var(--color-lavender);
}

.filter-clear.active {
  color: var(--color-lavender);
  font-weight: 700;
}

.filter-name {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 16px;
  color: var(--color-gray-5);
  transition: color 0.2s;
}

.filter-name:hover {
  color: var(--color-lavender);
}

.filter-name.expanded .filter-arrow {
  transform: rotate(90deg);
}

.filter-name.has-selection {
  color: var(--color-lavender);
  font-weight: 700;
}

.filter-arrow {
  width: 7px;
  height: 12px;
  transition: transform 0.2s;
  flex-shrink: 0;
}

.filter-options {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0 0 8px 8px;
  max-height: var(--filter-list-max-height, calc(100vh - 380px));
  overflow-y: auto;
}

.filter-options.open {
  display: flex;
}

.filter-option {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-gray-4);
  text-align: left;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}

.filter-option:hover {
  background: var(--color-light-2);
  color: var(--color-gray-5);
}

.filter-option.active {
  background: var(--color-lavender-bright);
  color: var(--color-lavender-dark);
}

/* Send postcard button — fixed, centered over left panel */
.send-postcard-btn {
  position: fixed;
  bottom: 32px;
  left: calc(32px + var(--width-sidebar) / 2);
  transform: translateX(-50%);
  width: var(--width-sidebar);
  z-index: var(--z-send-btn);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 14px 32px 12px;
  border-radius: 20px;
  transition: box-shadow 0.3s ease;
}

.send-postcard-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 20px;
  padding: 2px;
  background: conic-gradient(
    from var(--rainbow-angle, 0deg),
    var(--color-pink),
    var(--color-orange),
    var(--color-yellow),
    var(--color-green),
    var(--color-blue),
    var(--color-purple),
    var(--color-pink)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.send-postcard-btn::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 26px;
  background: conic-gradient(
    from var(--rainbow-angle, 0deg),
    var(--color-pink),
    var(--color-orange),
    var(--color-yellow),
    var(--color-green),
    var(--color-blue),
    var(--color-purple),
    var(--color-pink)
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  padding: 3px;
  opacity: 0;
  animation: rainbow-nudge-opacity 120s ease 3s infinite;
}

@keyframes rainbow-nudge-opacity {
  0%     { opacity: 0;   --rainbow-angle: 0deg; }
  0.5%   { opacity: 0.5; --rainbow-angle: 60deg; }
  1.5%   { opacity: 0.5; --rainbow-angle: 240deg; }
  2.5%   { opacity: 0;   --rainbow-angle: 360deg; }
  100%   { opacity: 0;   --rainbow-angle: 360deg; }
}

.send-postcard-btn:hover::after {
  animation: none;
  opacity: 0;
}

.send-postcard-btn:hover::before {
  opacity: 1;
  animation: rainbow-spin 3s linear infinite;
}

.send-postcard-btn:hover {
  background:
    linear-gradient(
      135deg,
      rgba(255, 153, 174, 0.15),
      rgba(253, 172, 136, 0.15),
      rgba(253, 224, 118, 0.15),
      rgba(155, 208, 176, 0.15),
      rgba(142, 217, 223, 0.15),
      rgba(217, 170, 225, 0.15)
    ),
    var(--color-white);
  background-size: 300% 300%, auto;
  animation: rainbow-glow 3s linear infinite, rainbow-bg 4s ease infinite;
  box-shadow:
    0 0 12px rgba(255, 153, 174, 0.4),
    0 0 24px rgba(253, 224, 118, 0.3),
    0 0 36px rgba(142, 217, 223, 0.3);
}

@keyframes rainbow-bg {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes rainbow-spin {
  to { --rainbow-angle: 360deg; }
}

@keyframes rainbow-glow {
  0%   { box-shadow: 0 0 14px rgba(255, 153, 174, 0.5), 0 0 28px rgba(255, 153, 174, 0.2); }
  17%  { box-shadow: 0 0 14px rgba(253, 172, 136, 0.5), 0 0 28px rgba(253, 172, 136, 0.2); }
  33%  { box-shadow: 0 0 14px rgba(253, 224, 118, 0.5), 0 0 28px rgba(253, 224, 118, 0.2); }
  50%  { box-shadow: 0 0 14px rgba(155, 208, 176, 0.5), 0 0 28px rgba(155, 208, 176, 0.2); }
  67%  { box-shadow: 0 0 14px rgba(142, 217, 223, 0.5), 0 0 28px rgba(142, 217, 223, 0.2); }
  83%  { box-shadow: 0 0 14px rgba(217, 170, 225, 0.5), 0 0 28px rgba(217, 170, 225, 0.2); }
  100% { box-shadow: 0 0 14px rgba(255, 153, 174, 0.5), 0 0 28px rgba(255, 153, 174, 0.2); }
}

@property --rainbow-angle {
  syntax: '<angle>';
  initial-value: 0deg;
  inherits: false;
}

.send-icon {
  width: var(--size-icon-send-w);
  height: var(--size-icon-send-h);
  transition: transform 0.3s ease;
}

.send-postcard-btn:hover .send-icon {
  transform: rotate(-6deg) translateY(-2px);
}

.send-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--font-size-send-label);
  color: var(--color-gray-4);
}

/* Masonry postcard grid */
.postcard-grid {
  flex: 1;
  columns: 3;
  column-gap: 16px;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.15), 0 4px 4px rgba(84, 65, 171, 0.2);
  border-radius: 4px;
  padding: 16px;
  isolation: isolate; /* prevent postcard will-change layers from escaping above the sticky header */
}

.postcard-item {
  break-inside: avoid;
  margin-bottom: 16px;
  position: relative;
  cursor: pointer;
  border-radius: 4px;
  overflow: hidden;
  transition: scale 0.15s ease-out, box-shadow 0.15s ease-out, translate 0.2s ease-out;
  transform-origin: center;
  will-change: transform, scale;
  translate: 0 0;
  scale: 1;
}

.postcard-item:hover {
  scale: 1.04;
  box-shadow: 0 6px 16px rgba(84, 65, 171, 0.35);
  z-index: var(--z-postcard-hover);
}

.postcard-link {
  display: block;
  width: 100%;
}

.postcard-image {
  width: 100%;
  height: auto;
  display: block;
}

.postcard-placeholder {
  background: var(--color-light-2);
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-3);
  font-family: var(--font-display);
}

/* "New!" badge */
.new-badge {
  position: absolute;
  top: 0;
  left: 0;
  width: 81px;
  height: 81px;
  overflow: hidden;
  z-index: var(--z-postcard-hover);
  pointer-events: none;
}

.new-badge span {
  display: block;
  position: absolute;
  top: 18px;
  left: -12px;
  width: 100px;
  text-align: center;
  transform: rotate(-45deg);
  background: var(--color-lavender-dark);
  color: var(--color-white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  padding: 4px 0;
}

/* Hidden items for filtering */
.postcard-item.filtered-out {
  display: none;
}

/* ==================== */
/* Modal Overlay         */
/* ==================== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-overlay);
}

.modal-overlay.active {
  display: block;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: transparent;
  backdrop-filter: blur(0);
  -webkit-backdrop-filter: blur(0);
}

.modal-postcard-details {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 800px;
  width: 85vw;
  max-height: 90vh;
}

/* Modal UI fade-in after fly animation */
.modal-postcard-details .modal-top-row,
.modal-postcard-details .modal-bottom-section,
.modal-postcard-details .modal-arrow-down {
  transition: opacity 0.2s ease;
}

.modal-postcard-details.fly-hidden .modal-top-row,
.modal-postcard-details.fly-hidden .modal-bottom-section,
.modal-postcard-details.fly-hidden .modal-arrow-down {
  opacity: 0;
}

/* Hide source postcard during animation */
.postcard-item.fly-source {
  opacity: 0 !important;
}

.modal-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: var(--img-width, 100%);
  margin-bottom: 8px;
}

.modal-postcard-number {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 24px;
  color: var(--color-white);
  padding: 4px 12px;
  background: linear-gradient(
    135deg,
    rgba(144, 126, 223, 0.55),
    rgba(217, 170, 225, 0.55),
    rgba(253, 224, 118, 0.55)
  );
  border-radius: 20px;
}

.modal-close-btn {
  background: rgba(40, 36, 58, 0.5);
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  line-height: 0;
  transition: opacity 0.2s;
}

.modal-close-btn img {
  filter: brightness(0) invert(1);
}

.modal-close-btn:hover {
  opacity: 0.7;
}

/* Card flip container */
.modal-postcard-wrapper {
  width: 100%;
  perspective: 1200px;
}

.modal-card-container {
  position: relative;
  width: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.45, 0, 0.25, 1);
  will-change: transform;
}

.modal-card-front {
  width: 100%;
  backface-visibility: hidden;
}

.modal-card-back {
  width: 100%;
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  transform: rotateY(-180deg);
}

.modal-card-container.flipped {
  transform: rotateY(-180deg);
}

@media (prefers-reduced-motion: reduce) {
  .modal-card-container {
    transition: none;
  }

  .modal-card-front {
    transition: opacity 0.3s ease;
  }

  .modal-card-back {
    transform: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
  }

  .modal-card-container.flipped {
    transform: none;
  }

  .modal-card-container.flipped .modal-card-front {
    opacity: 0;
    pointer-events: none;
  }

  .modal-card-container.flipped .modal-card-back {
    opacity: 1;
    pointer-events: auto;
  }
}

.modal-front-img,
.modal-back-img {
  width: 100%;
  max-height: 65vh;
  object-fit: contain;
  display: block;
  border-radius: 2px;
  filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.35));
}

/* Bottom section: accessibility + flip */
.modal-bottom-section {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  width: var(--img-width, 100%);
  margin-top: 24px;
}

.modal-accessibility-btns {
  display: flex;
  gap: 16px;
}

.modal-right-btns {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.modal-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: transform 0.15s;
}

.modal-action-btn:hover {
  transform: translateY(-2px);
}

.modal-action-icon {
  width: var(--size-icon-action);
  height: auto;
}

/* Listen button playing state */
.modal-listen-btn.playing {
  animation: pulse-glow 1.5s ease-in-out infinite;
}

.modal-listen-btn.playing .modal-action-icon {
  filter: drop-shadow(0 0 6px rgba(195, 177, 225, 0.7));
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* Read transcript overlay */
.modal-read-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--visible-img-width, 100%);
  height: var(--visible-img-height, 100%);
  background: rgba(255, 255, 255, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  border-radius: 2px;
  overflow-y: auto;
}

.modal-read-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-read-text {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-gray-5);
  text-align: center;
  max-width: 480px;
  margin: 0;
}

/* Read button active state */
.modal-read-btn.reading .modal-action-icon {
  filter: drop-shadow(0 0 6px rgba(195, 177, 225, 0.7));
}

/* Down arrow to reply */
.modal-arrow-down {
  background: rgba(40, 36, 58, 0.5);
  border: none;
  cursor: pointer;
  margin-top: 16px;
  padding: 8px 16px;
  border-radius: 20px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ==================== */
/* Reply Info Modal      */
/* ==================== */
.reply-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-fullscreen);
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
}

.reply-overlay.active {
  display: flex;
}

.reply-card {
  background: var(--color-white);
  border-radius: 16px;
  box-shadow: 0 4px 4px rgba(0, 0, 0, 0.25);
  width: 490px;
  max-width: 95vw;
  max-height: 90vh;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.reply-close,
.send-modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  line-height: 0;
}

.reply-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.reply-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 24px;
  color: var(--color-black);
  text-align: center;
}

.reply-instruction {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 20px;
  letter-spacing: 1.28px;
  color: var(--color-black);
  text-align: center;
  max-width: 400px;
}

/* Example postcard in reply modal */
.reply-postcard-example {
  background: var(--color-white);
  border: 1px solid var(--color-gray-1);
  box-shadow: 0 4px 4px rgba(0, 0, 0, 0.25);
  width: 420px;
  max-width: 100%;
  padding: 20px 24px;
  position: relative;
  border-radius: 2px;
}

.reply-example-number {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 20px;
  color: var(--color-black);
  border: 2px solid var(--color-warning);
  display: inline-block;
  padding: 2px 8px;
  margin-bottom: 8px;
}

.reply-example-body {
  display: flex;
  gap: 0;
  min-height: 200px;
}

.reply-example-left {
  flex: 1;
  padding-right: 12px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.4;
  color: var(--color-black);
}

.reply-example-meta {
  font-style: italic;
  color: var(--color-gray-3);
  margin-bottom: 8px;
  text-align: right;
}

.reply-example-heading {
  font-style: italic;
  margin-bottom: 8px;
  text-decoration: underline;
}

.reply-example-text {
  font-style: italic;
  color: var(--color-gray-3);
  margin-bottom: 12px;
}

.reply-example-sign {
  font-style: italic;
}

.reply-example-divider {
  width: 1px;
  background: var(--color-gray-2);
  flex-shrink: 0;
}

.reply-example-right {
  flex: 1;
  padding-left: 12px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.reply-example-stamp {
  width: 39px;
  height: 46px;
  border: 1px solid var(--color-black);
  margin-bottom: 16px;
}

.reply-example-address {
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  text-align: right;
  color: var(--color-black);
  text-decoration: underline;
}

/* ==================== */
/* Responsive            */
/* ==================== */
@media (max-width: 1024px) {
  .postcard-grid {
    columns: 2;
  }

  .landing-layout {
    padding: 0 24px 24px;
    gap: 24px;
  }

  .send-postcard-btn {
    left: calc(24px + var(--width-sidebar) / 2);
    transform: translateX(-50%);
    width: var(--width-sidebar);
    padding: 12px 24px 10px;
  }
}

@media (max-width: 768px) {
  .landing-layout {
    flex-direction: column;
    padding: 0 16px 96px;
  }

  .sidebar {
    width: 100%;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    position: relative;
    top: auto;
    z-index: var(--z-mobile-sidebar);
  }

  .filters {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px 0;
  }

  .filter-options.open {
    position: absolute;
    background: var(--color-white);
    border: 1px solid var(--color-gray-1);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 8px;
    z-index: var(--z-filter-dropdown);
    max-height: 300px;
    top: 100%;
    left: 0;
  }

  .filter-name {
    position: relative;
  }

  /* Send button floats at bottom-left on mobile */
  .send-postcard-btn {
    bottom: 16px;
    left: 16px;
    transform: none;
    top: auto;
    right: auto;
    width: auto;
    padding: 10px 20px;
    z-index: var(--z-send-btn);
    background: var(--color-white);
    border-radius: 20px;
    border: 2px solid var(--color-lavender);
  }

  .send-label-suffix {
    display: none;
  }

  /* Hide rainbow border on mobile — solid border used instead */
  .send-postcard-btn::before {
    opacity: 0;
    animation: none;
  }

  .site-footer {
    padding-bottom: 100px;
  }

  .reply-card {
    width: 95vw;
    max-height: 85vh;
    padding: 12px;
  }

  .reply-postcard-example {
    width: 100%;
    padding: 14px 16px;
  }

  .postcard-grid {
    columns: 2;
    padding: 12px;
  }

  .modal-postcard-details {
    width: 95vw;
  }
}

@media (max-width: 480px) {
  .postcard-grid {
    columns: 1;
  }
}


@media (prefers-reduced-motion: reduce) {
  .send-postcard-btn::after {
    animation: none;
  }

  .send-postcard-btn:hover::before {
    animation: none;
  }

  .send-postcard-btn:hover {
    animation: none;
  }
}