/* Seriné Studio v4 — éditorial calme : papier, encre, un point rouge. */
:root{
  --paper:#F4F1EC;
  --white:#FFFFFF;
  --ink:#141414;
  --mute:#6B6760;
  --rule:#DCD6CC;
  --red:#C8102E;
  --serif:"Instrument Serif",Georgia,serif;
  --sans:"Inter",system-ui,sans-serif;
  --pad:clamp(20px,5vw,80px);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--sans);overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(50px,7vw,108px);line-height:.96}
h1 em{font-style:italic;color:var(--red)}
h2{font-size:clamp(40px,5.6vw,84px);line-height:.96}
h3{font-size:clamp(26px,2.4vw,34px);line-height:1.1}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--mute);margin-bottom:22px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal,.fx{opacity:1!important;transform:none!important;animation:none;transition:none}.strip-track{animation:none!important}.loader{display:none}}

/* ---------- header ---------- */
.bar{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:16px var(--pad);background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .4s}
.bar.scrolled{border-bottom-color:var(--rule)}
.brand{display:flex;align-items:baseline;gap:9px;text-decoration:none}
.brand .wm{font-family:var(--serif);font-style:italic;font-size:30px;line-height:1;letter-spacing:-.02em}
.dot{color:var(--red);font-style:italic}
.brand .st,.sig .st{font-family:var(--sans);font-style:normal;font-weight:600;font-size:10px;letter-spacing:.42em}
.nav{display:flex;align-items:center;gap:30px;font-size:15px;font-weight:500}
.nav a:not(.btn){text-decoration:none;position:relative;padding:4px 0}
.nav a:not(.btn)::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--ink);transform:scaleX(0);transform-origin:right;transition:transform .5s var(--ease)}
.nav a:not(.btn):hover::after{transform:scaleX(1);transform-origin:left}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:15px 26px;border-radius:999px;font:500 15px/1 var(--sans);text-decoration:none;border:0;cursor:pointer;transition:transform .5s var(--ease),background .3s,box-shadow .5s var(--ease)}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(20,20,20,.45)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:#B00E28}
.link{display:inline-flex;align-items:center;gap:8px;font-weight:500;text-decoration:none;border-bottom:1px solid var(--ink);padding-bottom:2px}
.link svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.6;transition:transform .5s var(--ease)}
.link:hover svg{transform:translateX(4px)}

/* ---------- hero ---------- */
.hero{min-height:calc(100svh - 72px);display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(30px,5vw,80px);align-items:center;padding:clamp(40px,6vh,80px) var(--pad) clamp(50px,8vh,100px)}
.lead{font-size:clamp(18px,1.5vw,22px);line-height:1.5;max-width:30em;margin:32px 0 36px;color:#2A2926}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:26px}
.fine{margin-top:34px;font-size:14px;color:var(--mute)}
.hero-phone{justify-self:center;text-align:center}
.phone{width:min(320px,100%);aspect-ratio:9/19;background:#111;border-radius:48px;padding:14px;box-shadow:0 50px 90px -40px rgba(20,20,20,.55),0 0 0 1px rgba(0,0,0,.15),inset 0 0 0 2px #2a2a2a;margin:0 auto;position:relative}
.phone::before{content:"";position:absolute;top:26px;left:50%;transform:translateX(-50%);width:92px;height:26px;background:#111;border-radius:999px;z-index:2}
.phone-screen{width:100%;height:100%;border-radius:36px;overflow:hidden;background:#fff}
.phone-cap{margin-top:22px;font-size:13px;color:var(--mute);max-width:34em;margin-left:auto;margin-right:auto}
.phone-sm{width:min(230px,38%);border-radius:38px;padding:10px}
.phone-sm::before{display:none}
.phone-sm .phone-screen{border-radius:30px}

/* chat mock */
.chat{display:flex;flex-direction:column;height:100%;background:var(--paper);text-align:left}
.chat-head{padding:50px 16px 12px;background:#fff;border-bottom:1px solid #ECE8E1;display:flex;align-items:center;gap:10px}
.chat-av{flex:none;width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--paper);font-family:var(--serif);font-style:italic;font-size:22px;display:flex;align-items:center;justify-content:center;padding-bottom:3px}
.chat-av i{color:var(--red);font-style:italic}
.chat-head b{display:block;font-size:14px;font-weight:600;line-height:1.2}
.chat-head small{display:flex;align-items:center;gap:5px;font-size:10.5px;color:var(--mute);margin-top:2px}
.chat-head .on{width:7px;height:7px;border-radius:50%;background:#2DB55D;flex:none}
.chat-body{flex:1;padding:14px 12px 12px;display:flex;flex-direction:column;gap:8px;overflow:hidden}
.msg{max-width:84%;padding:9px 12px;border-radius:16px;font-size:12.5px;line-height:1.35;opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.msg.in{opacity:1;transform:none}
.msg.c{align-self:flex-start;background:#fff;border-bottom-left-radius:4px;box-shadow:0 1px 2px rgba(0,0,0,.05)}
.msg.a{align-self:flex-end;background:var(--ink);color:#fff;border-bottom-right-radius:4px}
.notif{margin-top:auto;background:#fff;border:1px solid var(--rule);border-radius:14px;padding:10px 12px;font-size:12px;line-height:1.35;box-shadow:0 14px 30px -14px rgba(0,0,0,.35);opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.notif.in{opacity:1;transform:none}
.notif b{display:block;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);margin-bottom:4px}
.notif .acts{display:flex;gap:6px;margin-top:8px}
.notif .acts span{padding:6px 11px;border-radius:999px;font-size:11px;font-weight:600;background:var(--ink);color:#fff}
.notif .acts span+span{background:transparent;color:var(--ink);border:1px solid var(--rule)}

/* ---------- strip ---------- */
.strip{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);overflow:hidden;padding:18px 0;background:var(--white)}
.strip-track{display:flex;align-items:center;gap:34px;width:max-content;font-size:14px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--mute);animation:strip 60s linear infinite}
.strip-track i{width:4px;height:4px;border-radius:50%;background:var(--red);flex:none}
@keyframes strip{to{transform:translateX(-50%)}}

/* ---------- sections ---------- */
section{padding:clamp(90px,12vw,180px) var(--pad)}

.why{background:#111;color:var(--paper)}
.why .eyebrow{color:#9B9790}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(28px,4vw,60px);margin-top:clamp(40px,5vw,70px)}
.why h3{margin-bottom:12px}
.why p{color:#C9C5BE;max-width:34ch}
.why .close{margin-top:clamp(50px,7vw,90px);font-family:var(--serif);font-size:clamp(28px,3.2vw,46px);line-height:1.15;max-width:22em;color:var(--paper)}
.why .close em{color:var(--red);font-style:italic}

.services-head{max-width:800px}
.svc{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:clamp(40px,5vw,60px)}
.svc article{background:var(--white);border:1px solid var(--rule);border-radius:22px;padding:30px 28px 32px;transition:transform .6s var(--ease),box-shadow .6s var(--ease)}
.svc article:hover{transform:translateY(-4px);box-shadow:0 30px 60px -40px rgba(20,20,20,.4)}
.svc .ic{width:42px;height:42px;border-radius:12px;background:var(--paper);display:flex;align-items:center;justify-content:center;margin-bottom:22px}
.svc .ic svg{width:20px;height:20px;fill:none;stroke:var(--ink);stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.svc h3{font-size:25px;margin-bottom:10px}
.svc .opt{font-family:var(--sans);font-size:10px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--red);vertical-align:middle;margin-left:6px}
.svc p{font-size:15px;color:#2A2926}
.keep{margin-top:18px;background:var(--ink);color:var(--paper);border-radius:22px;padding:clamp(30px,4vw,48px);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(20px,4vw,50px);align-items:center}
.keep h3{font-size:clamp(28px,3vw,40px)}
.keep p{color:#C9C5BE}

.method{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(40px,6vw,110px);align-items:start}
.method-head{position:sticky;top:110px}
.steps{list-style:none;padding:0;display:flex;flex-direction:column}
.step{display:grid;grid-template-columns:90px 1fr;gap:20px;padding:40px 0;border-top:1px solid var(--rule)}
.step:last-child{border-bottom:1px solid var(--rule)}
.step .num{font-family:var(--serif);font-size:clamp(40px,4vw,60px);line-height:1;color:var(--red);font-style:italic}
.step h3{margin-bottom:12px}
.step p{color:#2A2926;max-width:44ch}

.work{background:var(--white);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:clamp(40px,6vw,100px);align-items:center}
.work-head p:not(.eyebrow){margin:26px 0 30px;color:#2A2926;max-width:40ch}
.work-proof{position:relative;padding-right:14%;padding-bottom:40px}
.browser{border-radius:14px;overflow:hidden;box-shadow:0 40px 80px -40px rgba(20,20,20,.45),0 0 0 1px rgba(0,0,0,.08);background:#fff}
.browser-bar{display:flex;align-items:center;gap:7px;padding:11px 14px;border-bottom:1px solid #eee;background:#FAFAFA}
.browser-bar i{width:9px;height:9px;border-radius:50%;background:#E3DED6}
.browser-bar span{margin-left:auto;margin-right:auto;font-size:12px;color:var(--mute);background:#F1EFEA;padding:4px 14px;border-radius:999px}
.work-proof .phone-sm{position:absolute;right:0;bottom:0;box-shadow:0 40px 70px -30px rgba(0,0,0,.55),0 0 0 1px rgba(0,0,0,.15)}

.prices-head{max-width:720px;margin-bottom:clamp(40px,5vw,70px)}
.prices-head p:not(.eyebrow){margin-top:24px;color:#2A2926;max-width:44ch}
.offer{background:var(--ink);color:var(--paper);border-radius:28px;padding:clamp(34px,4.5vw,64px);display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,4vw,60px)}
.offer h3{font-family:var(--sans);font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:#9B9790;margin-bottom:18px}
.offer .big{font-family:var(--serif);font-size:clamp(52px,6vw,96px);line-height:.95;letter-spacing:-.03em;margin-bottom:26px}
.offer .big small{display:block;font-size:clamp(15px,1.2vw,18px);letter-spacing:0;color:#C9C5BE;font-family:var(--sans);margin-top:12px}
.offer ul{list-style:none;padding:0;display:flex;flex-direction:column;gap:11px}
.offer li{padding-left:22px;position:relative;color:#E8E4DD;font-size:16px}
.offer li::before{content:"";position:absolute;left:0;top:.62em;width:8px;height:8px;border-radius:50%;background:var(--red)}
.offer .col+.col{border-left:1px solid #2C2C2C;padding-left:clamp(30px,4vw,60px)}
.offer-note{grid-column:1/-1;border-top:1px solid #2C2C2C;padding-top:22px;color:#9B9790;font-size:14px;line-height:1.6;max-width:72ch}
.offer-note b{color:var(--paper);font-weight:600}

.faq{max-width:900px}
.faq h2{margin-bottom:34px}
details{border-top:1px solid var(--rule)}
details:last-child{border-bottom:1px solid var(--rule)}
summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 0;font-family:var(--serif);font-size:clamp(22px,2vw,28px);line-height:1.2}
summary::-webkit-details-marker{display:none}
summary i{flex:none;width:22px;height:22px;position:relative}
summary i::before,summary i::after{content:"";position:absolute;left:50%;top:50%;width:16px;height:1.5px;background:var(--ink);transform:translate(-50%,-50%);transition:transform .4s var(--ease)}
summary i::after{transform:translate(-50%,-50%) rotate(90deg)}
details[open] summary i::after{transform:translate(-50%,-50%) rotate(0)}
details p{padding:0 0 24px;color:#2A2926;max-width:60ch}

.contact{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(40px,6vw,110px);align-items:start;background:var(--white);border-top:1px solid var(--rule)}
.contact-copy p:not(.eyebrow){margin-top:24px;color:#2A2926;max-width:40ch}
.form{display:flex;flex-direction:column;gap:8px;max-width:520px}
.form label{font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--mute);margin-top:14px}
.form input{font:400 17px/1.3 var(--sans);padding:16px 18px;border:1px solid var(--rule);border-radius:12px;background:var(--paper);color:var(--ink);outline:0;transition:border-color .3s,box-shadow .3s}
.form input:focus{border-color:var(--ink);box-shadow:0 0 0 3px rgba(20,20,20,.08)}
.form input[aria-invalid="true"]{border-color:var(--red)}
.form .hp{position:absolute;left:-9999px}
.form .btn{margin-top:24px;align-self:flex-start}
.form-msg{font-size:14px;color:var(--mute);min-height:1.4em;margin-top:8px}

/* ---------- footer ---------- */
.foot{background:#111;color:var(--paper);padding:clamp(70px,9vw,120px) var(--pad) 30px;overflow:hidden}
.sig{display:flex;flex-wrap:wrap;align-items:baseline;font:italic 400 clamp(84px,17vw,300px)/.9 var(--serif);letter-spacing:-.03em;margin-bottom:40px}
.sig .st{font-size:clamp(12px,1.4vw,20px);letter-spacing:.5em;margin-left:clamp(14px,2vw,30px);color:#9B9790}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 32px;font-size:14px;color:#9B9790;border-top:1px solid #2C2C2C;padding-top:22px}
.foot-row a{color:inherit}

/* ---------- mobile ---------- */
@media (max-width:900px){
  .nav a:not(.btn){display:none}
  .brand .st{display:none}
  .brand .wm{font-size:27px}
  .btn{padding:13px 20px;font-size:14px}
  .hero{grid-template-columns:1fr;min-height:0;padding-top:48px;gap:50px}
  h1{font-size:clamp(50px,14vw,86px)}
  .hero-phone{order:2}
  .phone{width:min(280px,84%)}
  .why-grid,.svc,.offer,.keep,.method,.work,.contact{grid-template-columns:1fr}
  .offer .col+.col{border-left:0;border-top:1px solid #2C2C2C;padding-left:0;padding-top:30px}
  .method-head{position:static}
  .step{grid-template-columns:60px 1fr;padding:30px 0}
  .work-proof{padding-right:0;padding-bottom:0}
  .work-proof .phone-sm{position:static;width:46%;margin:-60px 0 0 auto}
  .form .btn{align-self:stretch}
}

/* ================= v6 effets ================= */
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
html.js .fx{opacity:0}
html.js #h1 .line{display:block;overflow:hidden;padding-bottom:.08em;margin-bottom:-.08em}
html.js #h1 .w{display:inline-block;will-change:transform}
html.js .reveal{opacity:0;transform:translateY(26px);transition:none}
html.js .reveal.in{opacity:1;transform:none}

/* loader */
.loader{position:fixed;inset:0;z-index:100;background:#111;color:var(--paper);display:flex;align-items:center;justify-content:center}
.loader .lw{font:italic 400 clamp(64px,10vw,140px)/1 var(--serif);letter-spacing:-.03em;opacity:0;transform:translateY(20px)}
.loader .dot{color:var(--red)}
html.no-anim .loader{display:none}

/* hero */
.hero{position:relative;overflow:hidden}
.hero-phone{position:relative}
.glow{position:absolute;left:50%;top:48%;width:min(620px,120%);aspect-ratio:1;transform:translate(-50%,-50%);border-radius:50%;background:radial-gradient(circle,rgba(200,16,46,.16),rgba(200,16,46,0) 62%);filter:blur(10px);pointer-events:none;animation:breathe 7s ease-in-out infinite}
@keyframes breathe{50%{transform:translate(-50%,-50%) scale(1.12)}}
.tilt{perspective:1400px}
.tilt .phone{transform-style:preserve-3d;transition:transform .9s var(--ease);will-change:transform}
.cue{position:absolute;left:var(--pad);bottom:28px;display:flex;align-items:center;gap:12px;font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute)}
.cue i{width:56px;height:1px;background:var(--ink);transform-origin:left;animation:cue 2.2s var(--ease) infinite}
@keyframes cue{0%{transform:scaleX(0);transform-origin:left}50%{transform:scaleX(1);transform-origin:left}51%{transform-origin:right}100%{transform:scaleX(0);transform-origin:right}}

/* why */
.why{position:relative;overflow:hidden}
.why .ghost{position:absolute;right:-.04em;top:50%;transform:translateY(-50%);font:italic 400 clamp(240px,42vw,720px)/1 var(--serif);color:rgba(244,241,236,.045);letter-spacing:-.05em;pointer-events:none;user-select:none;will-change:transform}
.why > *:not(.ghost){position:relative}

/* services cards: tilt + shine */
.svc .card{position:relative;overflow:hidden;transform-style:preserve-3d;transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.svc .card::after{content:"";position:absolute;inset:0;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(200,16,46,.10),transparent 60%);opacity:0;transition:opacity .5s}
.svc .card:hover::after{opacity:1}
.svc .card:hover{box-shadow:0 36px 70px -40px rgba(20,20,20,.45)}

/* steps progress line */
.steps-wrap{position:relative}
.steps-line{position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--rule)}
.steps-line i{position:absolute;left:0;top:0;width:100%;height:0;background:var(--red)}
.steps{padding-left:36px}
.step{border-top-color:transparent}
.step:last-child{border-bottom-color:transparent}

/* work: browser scrolls */
.browser-view{height:0;padding-bottom:62.5%;position:relative;overflow:hidden;background:#fff}
.browser-view img{position:absolute;left:0;top:0;width:100%;height:auto;will-change:transform}

/* offer */
.offer{position:relative;overflow:hidden}
.offer::before{content:"";position:absolute;inset:-40%;background:conic-gradient(from 180deg at 50% 50%,transparent 0 70%,rgba(200,16,46,.18) 85%,transparent 100%);animation:spin 18s linear infinite;pointer-events:none}
@keyframes spin{to{transform:rotate(1turn)}}
.offer > *{position:relative}

/* magnetic buttons */
.btn{will-change:transform}
.btn span{display:inline-block}

/* footer signature reveal */
.sig .ch{display:inline-block;will-change:transform}