/* ============================================
   TOKENS
   ============================================ */
:root {
  --bg: #15120e;
  --bg-deep: #0f0d0a;
  --paper: #f4ecdd;
  --paper-shadow: #ddccac;
  --paper-dark: #c9b78e;
  --flap-tone: #d3c298;
  --ink: #322722;
  --ink-soft: #6b5c4f;
  --wine: #7a2e2e;
  --wine-light: #9c4646;
  --gold: #a8842f;
  --gold-light: #c9a54f;
  --gold-rgb: 168, 132, 47;
  --gold-light-rgb: 201, 165, 79;
  --hairline: rgba(var(--gold-rgb), 0.4);
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Jost", -apple-system, BlinkMacSystemFont, sans-serif;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.75rem;
  --space-4: 3rem;
  --space-5: 5rem;
  --space-6: 7rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--paper);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}

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

:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 4px; border-radius: 2px; }
a { color: inherit; }

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============================================
   HERO / ENVELOPE
   ============================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4) var(--space-2);
  overflow: hidden;
}

#particlesCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.envelope-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  z-index: 1;
}

.envelope {
  position: relative;
  width: min(84vw, 340px);
  aspect-ratio: 1.6 / 1;
  perspective: 900px;
}

.envelope::after {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: -1.4rem;
  height: 1.8rem;
  background: radial-gradient(ellipse 60% 100% at 50% 50%, rgba(0, 0, 0, 0.6), transparent 75%);
  z-index: 0;
  pointer-events: none;
  transition: opacity 0.6s var(--ease);
}
.envelope.is-open::after { opacity: 0.35; }

.env-shape {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  filter: drop-shadow(0 24px 40px rgba(0, 0, 0, 0.5));
  transition: opacity 0.7s var(--ease), filter 0.7s var(--ease);
}
.es-back { fill: var(--paper-dark); transition: fill 0.7s var(--ease); }
.es-pocket { fill: var(--paper-shadow); transition: fill 0.7s var(--ease), opacity 0.7s var(--ease); }

.envelope.is-open .env-shape {
  opacity: 0.45;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.45));
}
.envelope.is-open .es-back { fill: #b8a072; }
.envelope.is-open .es-pocket { fill: #c4ae7e; opacity: 0.7; }

.env-letter {
  position: absolute;
  left: 6%;
  right: 6%;
  top: 8%;
  width: 88%;
  background: var(--paper);
  color: var(--ink);
  padding: 2.25rem 1.25rem 1.75rem;
  text-align: center;
  z-index: 2;
  opacity: 0;
  box-shadow: 0 22px 44px -14px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(var(--gold-rgb), 0.25);
  transform: translateY(6%) scale(0.96);
  transition:
    opacity 0.75s 0.2s var(--ease),
    transform 0.75s 0.2s var(--ease),
    box-shadow 0.75s 0.2s var(--ease);
  pointer-events: none;
  border-radius: 1px;
}

.envelope.is-open .env-letter {
  opacity: 1;
  transform: translateY(-10%) scale(1);
  z-index: 5;
  pointer-events: auto;
  box-shadow: 0 28px 50px -12px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(var(--gold-rgb), 0.35), 0 0 60px -10px rgba(var(--gold-light-rgb), 0.2);
}

.env-flap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  width: 100%;
  height: 60%;
  z-index: 3;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  transform-origin: top center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s var(--ease);
}
.env-flap:hover .env-flap-shape polygon { fill: #ddd0a8; filter: brightness(1.08); }
.env-flap:active .env-flap-shape polygon { fill: #c9b878; transition: fill 0.1s; }

.env-flap-shape {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  filter: drop-shadow(0 -2px 6px rgba(0, 0, 0, 0.25));
}
.env-flap-shape polygon { fill: var(--flap-tone); transition: fill 0.3s; }

.envelope.is-open .env-flap {
  transform: rotateX(-175deg);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.9s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s 0.35s var(--ease);
}

.seal {
  --seal-pos: translate(-50%, 42%) rotate(-4deg);
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: var(--seal-pos);
  width: 4.6rem;
  height: 4.6rem;
  z-index: 4;
  cursor: pointer;
  transition: transform 0.3s var(--ease);
}
.envelope:not(.is-open) .seal { animation: sealPulse 2.6s ease-in-out infinite; }
.envelope:not(.is-open) .seal:hover { transform: var(--seal-pos) scale(1.1); }
.envelope:not(.is-open) .seal:active {
  transform: var(--seal-pos) scale(0.95);
  transition: transform 0.1s;
}
.seal-blob { width: 100%; height: 100%; filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.5)); }
.seal-blob path { fill: var(--wine); transition: fill 0.3s; }
.seal:hover .seal-blob path { fill: var(--wine-light); }
.seal-mono {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--paper);
  transform: rotate(-4deg);
  pointer-events: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

@keyframes sealPulse {
  0%, 100% { transform: var(--seal-pos) scale(1); }
  50% { transform: var(--seal-pos) scale(1.09); }
}

.seal-ripple {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(201, 165, 79, 0.5);
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: rippleOut 0.7s var(--ease) forwards;
}
@keyframes rippleOut {
  0% { width: 0; height: 0; opacity: 1; }
  100% { width: 12rem; height: 12rem; opacity: 0; }
}

.eyebrow {
  font-size: 0.62rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--wine);
  margin-bottom: 0.15rem;
}
.names {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 500;
  font-size: clamp(1.8rem, 8vw, 2.4rem);
  line-height: 1.08;
  margin-top: 0.5rem;
}
.names .name { display: block; }
.names .amp {
  display: block;
  font-style: italic;
  font-weight: 400;
  font-size: 0.5em;
  color: var(--wine);
  margin: 0.1em 0;
}
.rule {
  width: 3rem;
  height: 1px;
  margin: 1rem auto;
  background: var(--hairline);
  position: relative;
}
.rule::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 5px;
  height: 5px;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--gold);
}
.tagline {
  font-size: 0.8rem;
  color: var(--ink-soft);
  max-width: 17rem;
  margin: 0 auto;
  line-height: 1.55;
}

.tap-hint {
  margin-top: 2.75rem;
  font-size: 0.64rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-soft);
  transition: opacity 0.5s var(--ease);
  z-index: 1;
  position: relative;
}

/* ============================================
   SCROLL CUE
   ============================================ */
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: var(--space-3);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 2;
}
.scroll-cue-text {
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.scroll-cue-line {
  width: 1px;
  height: 2.2rem;
  background: linear-gradient(to bottom, var(--gold-light), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-cue-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--gold));
  animation: scrollCueDrop 1.8s ease-in-out infinite;
}
@keyframes scrollCueDrop {
  0% { top: -100%; }
  100% { top: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-cue-line::after { animation: none; display: none; }
}

/* ============================================
   WHEN / WHERE — symmetric, overflow-safe
   ============================================ */
.details {
  background: var(--bg-deep);
  padding: var(--space-6) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.details-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: clamp(1rem, 5vw, 3.5rem);
  align-items: center;
  max-width: 800px;
  width: 100%;
}
.detail-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-3) 0;
  min-width: 0; /* prevents nowrap text from forcing grid-column overflow */
}
.detail-label {
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: var(--space-2);
}
.detail-main {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.15rem, 5vw, 2.2rem);
  color: var(--paper);
  line-height: 1.2;
  max-width: 100%;
}
.detail-sub {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.35rem;
}
.detail-btn {
  margin-top: var(--space-3);
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-light);
  background: transparent;
  border: 1px solid var(--hairline);
  padding: 0.8em 1.4em;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease), color 0.35s var(--ease);
}
.detail-btn:hover {
  border-color: var(--gold);
  background: rgba(var(--gold-rgb), 0.1);
  color: var(--gold-light);
}
.detail-divider {
  width: 1px;
  height: clamp(70px, 20vw, 140px);
  background: linear-gradient(to bottom, transparent, var(--hairline) 15%, var(--hairline) 85%, transparent);
  align-self: center;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .details-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .detail-divider {
    width: 100px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--hairline) 15%, var(--hairline) 85%, transparent);
    justify-self: center;
  }
}

/* ============================================
   COUNTDOWN
   ============================================ */
.countdown {
  background: var(--bg);
  padding: var(--space-6) var(--space-2);
  text-align: center;
}
.countdown-label {
  font-size: 0.64rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: var(--space-4);
}
.countdown-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.25rem 1rem;
  max-width: 26rem;
  margin: 0 auto;
}
.cd-unit { display: flex; flex-direction: column; align-items: center; }
.cd-num {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.5rem, 11vw, 3.4rem);
  color: var(--paper);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.cd-word {
  margin-top: 0.5rem;
  font-size: 0.6rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ============================================
   NOTE / FOOTER
   ============================================ */
.note {
  background: var(--bg-deep);
  padding: var(--space-6) var(--space-3);
  text-align: center;
}
.note-text {
  max-width: 26rem;
  margin: 0 auto;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.1rem, 4.5vw, 1.4rem);
  line-height: 1.55;
  color: var(--paper);
}
.note-sign {
  margin-top: var(--space-3);
  font-size: 0.64rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold-light);
}

.footer {
  background: var(--bg);
  border-top: 1px solid rgba(var(--gold-rgb), 0.15);
  padding: var(--space-4) var(--space-3);
  text-align: center;
}
.dedication {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--gold-light);
}

/* ============================================
   RESPONSIVE — larger screens
   ============================================ */
@media (min-width: 640px) {
  .envelope { width: min(70vw, 380px); }
  .countdown-grid { grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
}

@media (min-width: 1024px) {
  .details-grid { max-width: 900px; }
}