/* ==========================================================================
   Design tokens and local fonts
   ========================================================================== */

@font-face {
  font-family: "Amsterdam Four";
  src: url("assets/fonts/amsterdam-four.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  --green: #003d20;
  --green-dark: #00190d;
  --terracotta: #9f5434;
  --terracotta-dark: #894027;
  --blush: #f1d5c5;
  --ivory: #fffdf8;
  --ink: #18362c;
  --gold: #c09a58;
  --envelope-paper: #ece6db;
  --envelope-texture: url("assets/natural-paper.png");
  --serif: "Cormorant Garamond", Georgia, serif;
  --script: "Allura", "Segoe Script", cursive;
  --opening-time: 1.4s;
}

/* ==========================================================================
   Document foundation
   ========================================================================== */

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  overflow-x: hidden;
  background:
    radial-gradient(
      circle at 18% 16%,
      rgba(169, 84, 52, 0.08),
      transparent 24rem
    ),
    radial-gradient(
      circle at 84% 78%,
      rgba(0, 72, 47, 0.08),
      transparent 30rem
    ),
    #f6f2ea;
  color: var(--ink);
  font-family: var(--serif);
}

button,
article {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

/* Ambient page texture and accessibility helpers */

.paper-grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.36;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.07'/%3E%3C/svg%3E");
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Invalid or missing invitation link */

.access-error {
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.access-error__card {
  width: min(32rem, 100%);
  padding: clamp(2.5rem, 8vw, 5rem) clamp(1.5rem, 6vw, 4rem);
  color: var(--green-dark);
  background: var(--envelope-texture), var(--envelope-paper);
  border: 1px solid rgba(69, 60, 43, 0.16);
  box-shadow: 0 1.8rem 3rem rgba(43, 34, 27, 0.16);
  text-align: center;
}

.access-error__monogram {
  width: min(15rem, 72%);
  height: auto;
  display: block;
  margin: 0 auto 1.5rem;
  object-fit: contain;
}

.access-error h1 {
  margin: 0;
  color: var(--green);
  font-size: clamp(1.7rem, 5vw, 2.7rem);
  font-weight: 500;
}

.access-error__card > p:last-child {
  margin: 1rem 0 0;
  font-size: 1.05rem;
}

/* Page chrome around the invitation */

.experience {
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  place-items: center;
  padding: 1.2rem clamp(1rem, 3vw, 3rem) 1rem;
}

.topline {
  width: min(36rem, 80vw);
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--terracotta-dark);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.topline span {
  height: 1px;
  flex: 1;
  background: currentColor;
  opacity: 0.45;
}

.topline p {
  margin: 0;
  font-size: clamp(0.67rem, 1vw, 0.78rem);
  white-space: nowrap;
}

/* ==========================================================================
   Book and cover
   ========================================================================== */

.invitation-stage {
  width: 100%;
  min-height: min(84svh, 52rem);
  display: grid;
  place-items: center;
  perspective: 2200px;
}

.book {
  position: relative;
  width: min(90vw, calc(78svh * 1.48), 58rem);
  aspect-ratio: 0.9;
  transform-style: preserve-3d;
  filter: drop-shadow(0 1.8rem 1.6rem rgba(43, 34, 27, 0.18));
  transition: transform var(--opening-time) cubic-bezier(0.22, 0.86, 0.29, 1);
}

.book.is-closed {
  transform: translateX(-25%) scale(0.92);
}

.book.is-open {
  transform: translateX(0) scale(1);
}

.stationary-page {
  position: absolute;
  inset: 0 0 0 50%;
  overflow: hidden;
  opacity: 1;
  background:
    linear-gradient(90deg, rgba(62, 46, 29, 0.14), transparent 9%),
    var(--envelope-texture), var(--envelope-paper);
  background-repeat: no-repeat, repeat;
  background-position:
    center,
    top left;
  border: 1px solid rgba(69, 60, 43, 0.15);
  box-shadow: inset 1.2rem 0 2rem rgba(37, 25, 14, 0.04);
}

.inside-mark {
  position: absolute;
  top: 13%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: baseline;
  gap: 0.18em;
  color: var(--green);
  font-family: var(--script);
  font-size: clamp(2rem, 5vw, 4.7rem);
  opacity: 0.11;
}

.inside-mark i {
  color: var(--terracotta);
  font-size: 0.6em;
  font-style: normal;
}

.cover {
  position: absolute;
  z-index: 10;
  inset: 0 0 0 50%;
  width: 50%;
  padding: 0;
  appearance: none;
  transform-origin: left center;
  transform-style: preserve-3d;
  background: none;
  border: 0;
  cursor: pointer;
  transition: transform var(--opening-time) cubic-bezier(0.22, 0.86, 0.29, 1);
}

.book.is-open .cover {
  transform: rotateY(-180deg);
}

.cover:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 5px;
}

.cover-face {
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid rgba(69, 60, 43, 0.16);
}

.cover-front {
  background: var(--envelope-texture), var(--envelope-paper);
  box-shadow:
    inset 1rem 0 1.8rem rgba(63, 45, 28, 0.06),
    0 1rem 2.5rem rgba(37, 29, 22, 0.19);
}

.cover-monogram {
  position: absolute;
  top: 10%;
  left: 14%;
  width: 72%;
  height: 52%;
  object-fit: contain;
  opacity: 90%;
}

.cover-copy {
  position: absolute;
  inset: auto 10% 13%;
  display: grid;
  gap: 0.8rem;
  color: var(--green);
  text-align: center;
  text-transform: uppercase;
}

.cover-copy strong {
  font-size: clamp(1rem, 2.3vw, 1.65rem);
  font-weight: 500;
  letter-spacing: 0.2em;
}

.cover-copy small {
  color: var(--terracotta-dark);
  font-size: clamp(0.9rem, 1.3vw, 1.2rem);
  letter-spacing: 0.2em;
}

.cover-back {
  transform: rotateY(180deg);
  background: var(--envelope-texture), var(--envelope-paper);
  color: var(--ivory);
  box-shadow: inset -1rem 0 1.8rem rgba(35, 15, 5, 0.16);
}

/* ==========================================================================
   Interior and card stack
   ========================================================================== */

.interior {
  position: absolute;
  z-index: 8;
  inset: 0;
  opacity: 1;
  pointer-events: none;
}

.book.is-open .interior {
  pointer-events: auto;
}

.spine {
  position: absolute;
  z-index: 0;
  top: 2%;
  bottom: 2%;
  left: 50%;
  width: 1px;
  background: linear-gradient(
    transparent,
    rgba(39, 27, 17, 0.22) 8%,
    rgba(39, 27, 17, 0.22) 92%,
    transparent
  );
  box-shadow: 0 0 1rem rgba(39, 27, 17, 0.18);
}

.insert-stack {
  position: absolute;
  top: 1.5%;
  right: 1%;
  bottom: 4%;
  left: 51%;
}

/* Card geometry is type-based, so removing a card never changes the others. */

.insert-card {
  --card-width: 92%;
  --card-height: 96%;
  --card-layer: 1;

  -webkit-user-select: none;
  user-select: none;
  container-type: size;
  position: absolute;
  z-index: var(--card-layer);
  bottom: 0;
  left: 50%;
  width: var(--card-width);
  height: var(--card-height);
  margin: 0;
  overflow: hidden;
  border: 0;
  border-radius: 1.8rem;
  box-shadow:
    0 1px 2px rgba(23, 24, 17, 0.14),
    0 3px 6px rgba(23, 24, 17, 0.07);
  cursor: pointer;
  transform: translateX(-50%);
  transform-origin: bottom center;
  transition:
    transform 0.55s cubic-bezier(0.2, 0.85, 0.25, 1),
    width 0.55s cubic-bezier(0.2, 0.85, 0.25, 1),
    height 0.55s cubic-bezier(0.2, 0.85, 0.25, 1),
    box-shadow 0.4s ease,
    filter 0.3s ease;
}

.insert-card--party {
  --card-height: 97%;
  --card-layer: 1;
}

.insert-card--ceremony {
  --card-height: 76%;
  --card-layer: 2;
}

.insert-card--message {
  --card-height: 55%;
  --card-layer: 3;
}

.insert-card.is-active {
  z-index: 20;
  outline: none;
  transform: translateX(-50%) translateY(-2%) rotate(0);
  box-shadow:
    0 2px 4px rgba(23, 24, 17, 0.15),
    0 7px 14px rgba(23, 24, 17, 0.11);
}

.insert-stack:has(.insert-card.is-active) .insert-card:not(.is-active) {
  filter: brightness(0.84) saturate(0.85);
}

.insert-card:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 4px;
}

/* Card content and typography */

.insert-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 clamp(0.75rem, 4cqw, 1.5rem) clamp(0.9rem, 4cqw, 1.5rem);
  text-align: center;
}

.insert-card--party {
  background: var(--terracotta);
  color: var(--ivory);
}

.insert-card--ceremony {
  background: var(--green);
  color: var(--ivory);
}

.event-frame-layer {
  position: absolute;
  z-index: 1;
  top: 0.8em;
  left: 12%;
  width: 76%;
  transform: scaleX(1.2);
  display: block;
  object-fit: contain;
  pointer-events: none;
}

.insert-card--ceremony .event-frame-layer {
  filter: brightness(0) invert(1);
}

.insert-card--message {
  background: var(--blush);
  color: var(--green-dark);
}

.insert-card--party .insert-kicker,
.insert-card--ceremony .insert-kicker {
  position: absolute;
  z-index: 2;
  top: -0.6em;
  left: 0%;
  width: 100%;
  min-height: 0;
  aspect-ratio: 1206 / 917;
  padding: 0;
  place-items: center;
  font-family: "Amsterdam Four", var(--script);
  font-size: 12cqw;
  line-height: 0.9;
  pointer-events: none;
  letter-spacing: 0.22em;
}

.insert-card--party .insert-inner::before,
.insert-card--ceremony .insert-inner::before {
  content: "";
  flex: 0 0 clamp(10rem, 55cqw, 15rem);
  width: 100%;
}

.insert-card--party .insert-kicker {
  color: var(--ivory);
}

.insert-card--ceremony .insert-kicker {
  color: var(--terracotta);
}

.insert-card--party .insert-content,
.insert-card--ceremony .insert-content {
  position: relative;
  z-index: 2;
}

.insert-kicker {
  position: relative;
  z-index: 1;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  margin: 0;
  padding-top: 0.3rem;
  font-family: var(--script);
  font-size: clamp(2rem, 11cqw, 3.35rem);
  font-weight: 400;
  line-height: 1;
  text-transform: none;
}

.insert-content {
  --content-gap: clamp(0.65rem, 3cqw, 1.2rem);

  width: 100%;
  display: grid;
  flex: 1;
  align-content: start;
  gap: var(--content-gap);
  font-size: clamp(0.75rem, 4.25cqw, 1.15rem);
  line-height: 1.26;
  letter-spacing: 0.045em;
  opacity: 1;
  transform: none;
  text-transform: uppercase;
}

.insert-content p {
  margin: 0;
}

.insert-content strong {
  font-weight: 600;
}

.insert-content .address {
  font-style: normal;
}

.location-link {
  display: inline-block;
  padding-block: 0.08em;
  color: inherit;
  text-decoration-color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  cursor: pointer;
}

.location-link:hover {
  text-decoration-thickness: 2px;
}

.location-link__line {
  display: block;
}

.location-link:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 0.2em;
  border-radius: 0.15em;
}

.insert-card--party .insert-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  gap: calc(var(--content-gap) + var(--content-gap));
  font-size: clamp(0.9rem, 5.25cqw, 1.65rem);
  line-height: 1.35;
}

.insert-card--ceremony .insert-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  gap: calc(var(--content-gap) + var(--content-gap) + var(--content-gap));
  font-size: clamp(1.1rem, 5.6cqw, 1.75rem);
  line-height: 1.35;
}

.insert-card--message .insert-inner {
  justify-content: flex-start;
  padding-inline: clamp(0.8rem, 4.5cqw, 1.7rem);
}

.insert-card--message .insert-kicker {
  margin: 0;
  font-size: clamp(2rem, 10cqw, 3.2rem);
}

.insert-card--message .insert-content {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: clamp(4.5rem, 22cqh, 7rem);
  font-size: clamp(0.85rem, 4.5cqw, 1.45rem);
  line-height: 1.35;
}

.message-salutation {
  position: absolute;
  z-index: 3;
  top: clamp(1.75rem, 7cqh, 2.5rem);
  right: clamp(0.8rem, 4.5cqw, 1.7rem);
  left: clamp(0.8rem, 4.5cqw, 1.7rem);
  margin: 0;
  font-family: "Amsterdam Four", var(--script);
  font-size: clamp(1.35rem, 7.8cqw, 2.1rem);
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1;
  text-align: center;
  text-transform: none;
}

/* ==========================================================================
   Envelope pocket
   ========================================================================== */

.pocket-shadow,
.pocket {
  position: absolute;
  right: 0%;
  bottom: 0%;
  left: 50%;
  height: 48%;
}

.book.has-two-cards .insert-card--message {
  --card-height: 67%;
}

.book.has-two-cards .insert-card--message .insert-content {
  justify-content: center;
  gap: clamp(0.4rem, 1.3cqh, 0.7rem);
  line-height: 1.6;
}

.book.has-two-cards .insert-card--message .insert-content p + p {
  margin-top: 0;
}

.book.has-two-cards .insert-card--message .message-salutation {
  top: clamp(2.4rem, 9cqh, 4.2rem);
}

.pocket-shadow {
  z-index: 7;
  filter: drop-shadow(0 -1px 4px rgba(46, 34, 21, 0.12));
  pointer-events: none;
}

.pocket-shadow::before {
  content: "";
  position: absolute;
  inset: 0;
  clip-path: polygon(0 0, 50% 15%, 100% 0, 100% 100%, 0 100%);
  background: #000;
}

.pocket {
  z-index: 8;
  overflow: hidden;
  clip-path: polygon(0 0, 50% 15%, 100% 0, 100% 100%, 0 100%);
  border: 1px solid rgba(66, 52, 37, 0.12);
  background: var(--envelope-texture), var(--envelope-paper);
  box-shadow:
    inset 0 1px rgba(255, 255, 255, 0.95),
    inset 0 -0.75rem 1.3rem rgba(74, 56, 35, 0.045);
  cursor: default;
  pointer-events: auto;
}

.pocket::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
        18deg,
        transparent 49.65%,
        rgba(67, 51, 34, 0.16) 49.9%,
        rgba(255, 255, 255, 0.75) 50.15%,
        transparent 50.4%
      )
      left / 50% 100% no-repeat,
    linear-gradient(
        -18deg,
        transparent 49.65%,
        rgba(67, 51, 34, 0.16) 49.9%,
        rgba(255, 255, 255, 0.75) 50.15%,
        transparent 50.4%
      )
      right / 50% 100% no-repeat;
}

.pocket-monogram {
  position: absolute;
  z-index: 1;
  top: 59%;
  left: 47%;
  width: 40%;
  object-fit: contain;
  opacity: 0.58;
  transform: translate(-50%, -50%);
}

/* ==========================================================================
   Controls and fallback messaging
   ========================================================================== */

.interaction-bar {
  min-height: 2.4rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--green-dark);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

.interaction-bar p {
  margin: 0;
}

.replay-button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.8rem;
  color: var(--green);
  background: rgba(255, 253, 248, 0.65);
  border: 1px solid rgba(0, 72, 47, 0.28);
  border-radius: 999px;
  cursor: pointer;
}

.replay-button[hidden] {
  display: none;
}

.replay-button:hover {
  background: var(--ivory);
}

.replay-button svg {
  width: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.noscript {
  position: fixed;
  inset: auto 1rem 1rem;
  padding: 0.8rem;
  color: white;
  background: #7b2c20;
  text-align: center;
}

/* ==========================================================================
   Responsive layout
   ========================================================================== */

@media (max-width: 760px) {
  .experience {
    padding: 0.85rem 0.65rem 0.7rem;
  }

  .topline {
    width: min(23rem, 92vw);
  }

  .invitation-stage {
    min-height: min(80svh, 45rem);
  }

  .book {
    width: min(85vw, 34rem);
    height: min(83svh, 51rem);
    aspect-ratio: auto;
    max-width: 390px;
  }

  .book.is-closed {
    transform: scale(0.86);
  }

  .stationary-page,
  .cover {
    inset: 0;
    width: 100%;
  }

  .cover-monogram {
    top: 9%;
    left: 10%;
    width: 80%;
    height: 55%;
    opacity: 90%;
  }

  .cover-copy strong {
    font-size: 1.35rem;
  }

  .book.is-open .cover {
    transform: rotateY(-105deg);
    pointer-events: none;
  }

  .inside-mark,
  .spine {
    display: none;
  }

  .event-frame-layer {
    left: 12%;
    width: 76%;
    top: 0.5em;
  }

  .insert-stack {
    inset: 1.5% 2% 5%;
  }

  .insert-card {
    --card-width: 85%;
  }
  .insert-card--party .insert-kicker {
    top: -0.6em;
    font-size: clamp(1.8rem, min(12cqw, 8cqh), 4rem);
  }

  .insert-card--ceremony .insert-kicker {
    top: -0.7em;
    font-size: clamp(1.8rem, min(12cqw, 8cqh), 4rem);
  }

  .insert-card--party {
    --card-height: 97%;
  }

  .insert-card--ceremony {
    --card-height: 77%;
  }

  .insert-card--message {
    --card-height: 57%;
  }

  .insert-card.is-active {
    z-index: 20;
    transform: translateX(-50%) translateY(-2%) rotate(0);
  }

  .insert-card--party .insert-inner::before,
  .insert-card--ceremony .insert-inner::before {
    flex-basis: clamp(7rem, min(55cqw, 37cqh), 15rem);
  }

  .insert-content {
    --content-gap: clamp(0.45rem, min(3cqw, 2.5cqh), 1.2rem);
  }

  .insert-card--party .insert-content {
    font-size: clamp(0.7rem, min(5.25cqw, 2.25cqh), 1.65rem);
    margin-top: 1rem;
  }

  .insert-card--ceremony .insert-content {
    font-size: clamp(0.8rem, min(5.6cqw, 3.5cqh), 1.75rem);
  }

  .insert-card--message .insert-kicker {
    font-size: clamp(1.5rem, min(10cqw, 9cqh), 3.2rem);
  }

  .insert-card--message .insert-content {
    font-size: clamp(0.68rem, min(4.5cqw, 4cqh), 1.45rem);
  }

  .message-salutation {
    font-size: clamp(1.05rem, min(7.8cqw, 6.8cqh), 2.1rem);
  }

  .insert-card--message .insert-content p + p {
    margin: 0;
  }

  .pocket-shadow,
  .pocket {
    right: 0%;
    left: 0%;
    height: 48%;
  }

  .book.has-two-cards .insert-card--message {
    --card-height: 67%;
  }

  .pocket-monogram {
    width: 33%;
  }

  .interaction-bar {
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
    font-size: 0.66rem;
    text-align: center;
  }

  .interaction-bar p {
    flex: 0 0 100%;
  }
}

@media (max-width: 390px), (max-height: 690px) {
  .topline {
    display: none;
  }

  .invitation-stage {
    min-height: 88svh;
  }

  .book {
    height: min(81svh, 50rem);
  }
}

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