/* Socle commun des invitations : mise en page et mécanique.
   L'apparence (polices, textures, décor) est fournie par themes/<thème>/style.css. */
:root{
  --display: Georgia, serif;
  --serif:   Georgia, serif;
  --script:  "Snell Roundhand", cursive;
  --texture: none;
  --aging:   none;
  --hint-color: rgba(255,255,255,.8);
  --hint-glow:  transparent;
  --on-accent:  #fff;
  --paper-shadow: rgba(0,0,0,.25);
  --fold: rgba(0,0,0,.14);
  --drop: rgba(0,0,0,.85);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  font-family:var(--serif);color:var(--ink);
  background:
    radial-gradient(ellipse 65% 55% at 50% 46%, color-mix(in srgb,var(--accent) 20%,var(--bg)) 0%, var(--bg) 72%),
    var(--bg);
  display:grid;place-items:center;overflow:hidden;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.decor{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.stage{position:relative;z-index:1;width:100%;min-height:100vh;min-height:100dvh;padding:16px 0;display:grid;place-items:center}
.stage > *{grid-area:1/1;place-self:center}
body.scroll{overflow-y:auto;overflow-x:hidden}

/* ============ Bandeau d'aperçu ============ */
.preview-ribbon{
  position:fixed;top:0;left:50%;transform:translateX(-50%);z-index:200;
  padding:.45em 1.1em;border-radius:0 0 8px 8px;
  font:600 .78rem/1.3 system-ui,sans-serif;letter-spacing:.02em;
  background:rgba(20,20,20,.82);color:#fff;
}

/* ============ Introduction ============ */
.intro{
  position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:24px;cursor:pointer;
  transition:opacity .9s ease;
}
.intro p{
  max-width:26ch;margin:0;text-align:center;
  font-family:var(--serif);font-size:clamp(1.3rem,5vw,2rem);line-height:1.45;color:var(--hint-color);
  animation:intro-text 4.2s ease both;
}
@keyframes intro-text{0%{opacity:0}18%,78%{opacity:1}100%{opacity:0}}
.intro.done{opacity:0;pointer-events:none}
body.has-intro:not(.intro-done) .envelope-wrap{animation:none;opacity:0;pointer-events:none}

/* ============ Enveloppe ============ */
.envelope-wrap{
  --w:min(84vw,440px);
  position:relative;width:var(--w);aspect-ratio:3/2;
  border:0;background:none;padding:0;cursor:pointer;color:inherit;font:inherit;
  -webkit-tap-highlight-color:transparent;
  animation:arrive 1.4s cubic-bezier(.2,.7,.2,1) both;
  transition:transform .9s cubic-bezier(.6,0,.2,1), opacity .7s ease;
}
@keyframes arrive{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
.envelope-wrap:focus-visible{outline:1px solid var(--gold);outline-offset:14px}

.env-back,.env-pocket,.letter{position:absolute}
.env-back{
  inset:0;border-radius:3px;
  background:var(--texture), color-mix(in srgb,var(--liner) 100%,#000);
  box-shadow:0 40px 70px -25px var(--drop), 0 6px 14px rgba(0,0,0,.3);
}
.letter{
  left:6%;right:6%;top:9%;bottom:5%;z-index:2;
  background:var(--texture), var(--aging), var(--paper);border-radius:2px;
  box-shadow:inset 0 0 22px var(--paper-shadow);
  transition:transform 1s cubic-bezier(.3,1,.4,1);
}
.letter::after{content:"";position:absolute;inset:8px;border:1px solid color-mix(in srgb,var(--gold) 55%,transparent)}
.env-pocket{
  inset:0;z-index:3;border-radius:3px;
  clip-path:polygon(0 0,50% 56%,100% 0,100% 100%,0 100%);
  background:var(--texture), var(--aging), linear-gradient(180deg, color-mix(in srgb,var(--envelope) 92%,#fff), var(--envelope));
}
.env-pocket::before,.env-pocket::after{content:"";position:absolute;inset:0}
.env-pocket::before{
  background:
    linear-gradient(to top right, var(--fold) 49.7%, transparent 50.3%) left/50% 100% no-repeat,
    linear-gradient(to top left,  color-mix(in srgb,var(--fold) 65%,transparent) 49.7%, transparent 50.3%) right/50% 100% no-repeat;
}
.env-pocket::after{
  background:
    linear-gradient(to bottom right, transparent 49.7%, var(--fold) 50%, transparent 50.6%) bottom left/50% 44% no-repeat,
    linear-gradient(to bottom left,  transparent 49.7%, var(--fold) 50%, transparent 50.6%) bottom right/50% 44% no-repeat;
  box-shadow:inset 0 0 28px var(--paper-shadow);
}
.addr{
  position:absolute;left:8%;right:8%;top:71%;z-index:3;text-align:center;pointer-events:none;
  font-family:var(--script);font-size:clamp(1.35rem,5.6vw,1.9rem);line-height:1.1;color:var(--ink);
  transition:opacity .3s ease;
}
/* Rabat : retournement simulé en 2D (scaleY), identique sur tous les navigateurs. */
.flap{
  position:absolute;left:0;top:0;width:100%;height:56%;z-index:4;
  transform-origin:50% 0;
  transition:transform .95s cubic-bezier(.45,0,.55,1), z-index 0s .475s;
}
.flap i{position:absolute;inset:0;clip-path:polygon(0 0,100% 0,50% 100%)}
.flap .out{background:var(--texture), var(--aging), linear-gradient(170deg, color-mix(in srgb,var(--envelope) 82%,#fff), var(--envelope))}
.flap .in{
  opacity:0;
  background:var(--texture), linear-gradient(0deg, color-mix(in srgb,var(--liner) 80%,#000), color-mix(in srgb,var(--liner) 100%,#000));
}
.seal{
  position:absolute;left:50%;top:56%;z-index:5;
  width:clamp(54px,16%,72px);aspect-ratio:1;transform:translate(-50%,-50%);
  border-radius:52% 48% 54% 46% / 47% 53% 47% 53%;
  background:radial-gradient(circle at 34% 28%, color-mix(in srgb,var(--accent) 62%,#fff) 0%, var(--accent) 46%, color-mix(in srgb,var(--accent) 62%,#000) 100%);
  box-shadow:0 5px 10px rgba(0,0,0,.45), inset 0 -3px 6px rgba(0,0,0,.4), inset 0 2px 3px rgba(255,255,255,.18);
  display:grid;place-items:center;
  transition:opacity .3s ease, transform .4s ease;
}
.seal::before{content:"";position:absolute;inset:14%;border-radius:50%;
  border:1.5px solid rgba(255,255,255,.2);box-shadow:inset 0 1px 3px rgba(0,0,0,.4), 0 1px 0 rgba(255,255,255,.1)}
.seal span{
  font-family:var(--display);font-weight:600;font-size:clamp(1.15rem,4.8vw,1.65rem);line-height:1;
  color:color-mix(in srgb,var(--accent) 50%,#000);
  text-shadow:0 1px 0 rgba(255,255,255,.3), 0 -1px 0 rgba(0,0,0,.25);
}
.hint{
  position:absolute;left:0;right:0;top:calc(100% + 34px);text-align:center;
  font-family:var(--serif);font-style:italic;font-size:1.2rem;color:var(--hint-color);
  text-shadow:0 0 14px var(--hint-glow);
  animation:fadein 1.6s 1.2s ease both;transition:opacity .3s ease;
}
@keyframes fadein{from{opacity:0}to{opacity:1}}

.envelope-wrap.open .flap{transform:scaleY(-1);z-index:1}
.envelope-wrap.open .flap .out{opacity:0;transition:opacity 0s .475s}
.envelope-wrap.open .flap .in{opacity:1;transition:opacity 0s .475s}
.envelope-wrap.open .seal{opacity:0;transform:translate(-50%,-50%) scale(.7)}
.envelope-wrap.open .hint{opacity:0;animation:none}
.envelope-wrap.rise .letter{transform:translateY(-60%)}
.envelope-wrap.gone{transform:translateY(34vh) scale(.94);opacity:0;pointer-events:none}

/* ============ Lettre d'invitation ============ */
.card{
  position:relative;width:min(90vw,450px);
  padding:clamp(38px,8vw,56px) clamp(26px,8vw,48px) clamp(30px,6vw,40px);
  text-align:center;background:var(--texture), var(--aging), var(--paper);border-radius:2px;
  box-shadow:0 50px 90px -30px var(--drop), 0 8px 20px rgba(0,0,0,.3), inset 0 0 46px var(--paper-shadow);
  opacity:0;visibility:hidden;transform:translateY(70px) scale(.62);
  transition:transform 1.1s cubic-bezier(.2,.9,.25,1), opacity .6s ease, visibility 0s 1.1s;
}
.card::before{content:"";position:absolute;inset:12px;border:1px solid color-mix(in srgb,var(--gold) 75%,transparent);pointer-events:none}
.card.show{opacity:1;visibility:visible;transform:none;transition-delay:0s}

.to{font-family:var(--script);font-size:1.9rem;line-height:1.1;margin:0 0 .5em;color:var(--ink)}
h1{
  font-family:var(--display);font-weight:500;font-size:clamp(1.5rem,6.6vw,2.15rem);
  line-height:1.22;letter-spacing:.015em;margin:0;text-wrap:balance;
}
.rule{width:56px;height:1px;background:var(--gold);margin:1.7em auto;position:relative}
.rule::after{content:"";position:absolute;left:50%;top:50%;width:7px;height:7px;background:var(--paper);
  border:1px solid var(--gold);transform:translate(-50%,-50%) rotate(45deg)}
.msg{margin:0 auto 1.6em;font-size:1.18rem;line-height:1.65;max-width:30ch;color:color-mix(in srgb,var(--ink) 88%,transparent)}
.note{
  display:block;width:100%;margin:0 0 1.5em;padding:.75em .9em;text-align:left;
  font-family:var(--serif);font-style:italic;font-size:1.08rem;line-height:1.5;color:var(--ink);
  background:rgba(255,255,255,.2);border:1px solid color-mix(in srgb,var(--ink) 32%,transparent);border-radius:2px;
  box-shadow:inset 0 2px 8px var(--paper-shadow);resize:none;
}
.note::placeholder{color:color-mix(in srgb,var(--ink) 55%,transparent)}
.note:focus{outline:2px solid var(--gold);outline-offset:2px}
.actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;align-items:center;min-height:50px}
.btn{
  font-family:var(--display);font-weight:500;font-size:.88rem;letter-spacing:.04em;
  border-radius:2px;padding:1em 1.7em;cursor:pointer;border:1px solid transparent;
  transition:transform .25s ease, background .25s ease, box-shadow .25s ease;
}
.btn:disabled{opacity:.7;cursor:progress}
.btn-yes{
  background:var(--accent);color:var(--on-accent);border-color:color-mix(in srgb,var(--gold) 80%,transparent);
  box-shadow:inset 0 0 0 2px color-mix(in srgb,var(--accent) 100%,#000), inset 0 0 0 3px color-mix(in srgb,var(--gold) 45%,transparent);
}
.btn-yes:hover{background:color-mix(in srgb,var(--accent) 85%,#fff);box-shadow:0 10px 24px -10px var(--accent), inset 0 0 0 3px color-mix(in srgb,var(--gold) 55%,transparent)}
.btn-no{background:transparent;color:var(--ink);border-color:color-mix(in srgb,var(--ink) 35%,transparent)}
.btn:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.btn-no.free{
  position:fixed;z-index:50;margin:0;background:var(--paper);
  box-shadow:0 10px 24px -8px rgba(0,0,0,.55);
  transition:left .32s cubic-bezier(.25,1.3,.5,1), top .32s cubic-bezier(.25,1.3,.5,1);
}
.spacer{display:inline-block}
.dodge-msg{min-height:1.5em;margin:1.4em 0 0;font-family:var(--serif);font-style:italic;font-size:1.08rem;color:var(--accent)}
.from{margin:.9em 0 0;font-family:var(--script);font-size:2rem;line-height:1.1;color:var(--ink)}

.success{display:none}
.card.done .invite{display:none}
.card.done .success{display:block;animation:settle .9s cubic-bezier(.2,.8,.3,1)}
.mark{color:var(--gold);font-size:1.6rem;margin-bottom:.8em;text-shadow:0 0 12px color-mix(in srgb,var(--gold) 60%,transparent)}
.success .msg{margin-bottom:0}
@keyframes settle{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

#confetti{position:fixed;inset:0;pointer-events:none;z-index:100}

/* Miniature de thème (étape 1) : lettre ouverte, sans interaction */
body.demo{overflow:hidden;pointer-events:none}
body.demo .envelope-wrap,body.demo .note,body.demo .dodge-msg{display:none}
body.demo .card{opacity:1;visibility:visible;transform:none;transition:none}
body.demo .stage{padding:0}

/* Page d'erreur */
.error-box{position:relative;z-index:1;max-width:420px;margin:0 16px;padding:40px 32px;text-align:center;
  background:var(--paper);color:var(--ink);border-radius:4px;box-shadow:0 30px 60px -20px rgba(0,0,0,.6)}
.error-box h1{font-size:1.6rem;margin-bottom:.6em}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.01s!important;transition-delay:0s!important}
}