:root {
  --navy: #1a3a5c;
  --steel: #2b5d8a;
  --steel-deep: #1e588f;
  --sky: #bcd4ea;
  --mist: #eaf2fb;
  --ink: #22323f;
  --muted: #44586a;
  --brick: #b5432c;
  --paper: #ffffff;
  --line: #9fc3e6;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 1.06rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

img { max-width: 100%; height: auto; }

a { color: var(--steel-deep); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--brick);
  outline-offset: 2px;
}

.header {
  background: url("header-capa.jpg") center / cover no-repeat, linear-gradient(120deg, #3f74a6, #2b5d8a);
  color: #fff;
  padding: 1.4rem clamp(1rem, 5vw, 4rem) 1.6rem;
  min-height: clamp(170px, 17vw, 290px);
  display: flex;
  align-items: center;
}
.header-inner { max-width: 1060px; margin: 0 auto; width: 100%; text-align: center; }
.header .surtitle {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 600;
  letter-spacing: .28em;
  text-transform: uppercase;
  font-size: .72rem;
  margin: 0 0 .35rem;
  text-shadow: 0 1px 6px rgba(20, 45, 70, .55);
}
.header h1 {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  margin: 0;
  text-shadow: 0 1px 8px rgba(20, 45, 70, .55);
}
.header .venue {
  margin: .4rem 0 0;
  font-size: clamp(.95rem, 2vw, 1.1rem);
  text-shadow: 0 1px 6px rgba(20, 45, 70, .55);
}
.header .venue strong { font-weight: 700; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--navy);
  display: flex;
  flex-wrap: wrap;
  gap: 0 .25rem;
  justify-content: center;
  padding: 0 .5rem;
}
.nav a {
  color: #fff;
  text-decoration: none;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 600;
  font-size: .85rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: .8rem .9rem;
}
.nav a:hover { background: var(--steel); }
.nav a.nav-cta { background: var(--brick); }
.nav a.nav-cta:hover { background: #9a3522; }

.title-band {
  text-align: center;
  padding: clamp(2rem, 6vw, 3.5rem) 1rem clamp(1.6rem, 4vw, 2.6rem);
}
.title-band h2 {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 900;
  color: var(--navy);
  font-size: clamp(1.7rem, 5.5vw, 3.1rem);
  letter-spacing: .015em;
  margin: 0;
  text-wrap: balance;
}
.title-band .dates {
  color: var(--steel-deep);
  font-family: Archivo, Arial, sans-serif;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: .95rem;
  margin-top: .7rem;
}
.title-band .hybrid {
  display: inline-block;
  margin-top: 1rem;
  background: var(--brick);
  color: #fff;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-size: .8rem;
  padding: .45rem 1.1rem;
}

.section { max-width: 1060px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem) clamp(2.5rem, 6vw, 4rem); }

.horizon {
  position: relative;
  text-align: center;
  margin: clamp(2.2rem, 6vw, 3.6rem) 0 clamp(1.4rem, 4vw, 2.2rem);
}
.horizon::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  border-top: 1px solid var(--line);
}
.horizon span {
  position: relative;
  background: var(--paper);
  padding: 0 1.2rem;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--navy);
  font-size: clamp(1.05rem, 3vw, 1.35rem);
}

.argument { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(1.5rem, 4vw, 3rem); align-items: start; }
.argument .texte {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 1.04rem;
  line-height: 1.72;
  color: var(--ink);
}
.argument .texte p { margin: 0 0 1.1em; }
.argument .texte p:first-of-type::first-letter {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  font-size: 3.1em;
  float: left;
  line-height: .85;
  padding: .07em .12em 0 0;
  color: var(--steel-deep);
}
.argument figure { margin: 0; position: sticky; top: 4.5rem; }
.argument figcaption { font-size: .82rem; color: var(--muted); margin-top: .5rem; }

.days { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.2rem, 3vw, 2.2rem); }
.day-banner {
  background: var(--steel);
  color: #fff;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  font-size: 1.15rem;
  text-align: center;
  padding: .55rem 1rem;
  margin-bottom: 1rem;
}
.slot { display: grid; grid-template-columns: 4.2rem 1fr; gap: .8rem; padding: .45rem 0; }
.slot .h {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 700;
  color: var(--steel-deep);
  font-size: .95rem;
  white-space: nowrap;
}
.slot .talk-title { font-style: italic; color: var(--muted); }
.slot .disc { font-size: .92rem; color: var(--muted); }
.slot.moderator { grid-template-columns: 1fr; text-align: center; color: var(--steel-deep); font-weight: 600; }
.slot.pause {
  grid-template-columns: 4.2rem 1fr;
  color: var(--steel-deep);
  font-weight: 600;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: .35rem 0;
}
.ateliers-title {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: .1em;
  border-bottom: 2px solid var(--navy);
  padding-bottom: .2rem;
  margin: .8rem 0 .6rem;
}
.atelier { padding: .4rem 0; font-size: .95rem; }
.atelier .qui { font-weight: 600; }

.infos { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.2rem; }
.info-card { background: var(--mist); padding: 1.2rem 1.4rem; }
.info-card h4 {
  margin: 0 0 .5rem;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: .1em;
  font-size: .85rem;
}
.info-card p { margin: 0; font-size: .98rem; }

.tarifs { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.4rem; align-items: stretch; }
.tarif {
  border: 1px solid var(--line);
  padding: 1.5rem 1.5rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  background: var(--paper);
}
.tarif.fp { background: var(--mist); border-color: var(--steel); }
.tarif h4 {
  margin: 0;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: .1em;
  font-size: .9rem;
}
.tarif .prix {
  font-family: Archivo, Arial, sans-serif;
  font-weight: 800;
  font-size: 2.1rem;
  color: var(--steel-deep);
}
.tarif p { margin: 0; font-size: .95rem; color: var(--muted); flex: 1; }
.btn {
  display: inline-block;
  text-align: center;
  text-decoration: none;
  font-family: Archivo, Arial, sans-serif;
  font-weight: 700;
  letter-spacing: .06em;
  padding: .7rem 1.3rem;
  border: none;
  cursor: pointer;
  font-size: .95rem;
}
.btn-primary { background: var(--brick); color: #fff; }
.btn-primary:hover { background: #9a3522; }
.btn-secondary { background: var(--steel-deep); color: #fff; }
.btn-secondary:hover { background: var(--navy); }
.btn-ghost { background: none; border: 1px solid var(--steel-deep); color: var(--steel-deep); }
.btn-ghost:hover { background: var(--mist); }

.footer {
  background: var(--navy);
  color: var(--sky);
  padding: 2rem clamp(1rem, 4vw, 2rem);
  text-align: center;
  font-size: .92rem;
}
.footer a { color: #fff; }
.footer .legal { font-size: .8rem; color: #7fa3c6; margin-top: .8rem; }
.footer img { height: 44px; width: auto; margin-top: 1rem; filter: brightness(0) invert(1); opacity: .85; }

.form-wrap { max-width: 760px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem) 4rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem 1.2rem; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: .25rem; color: var(--navy); }
.field .hint { font-weight: 400; color: var(--muted); font-size: .82rem; }
.field input[type=text], .field input[type=email], .field input[type=tel], .field select, .field textarea {
  width: 100%;
  padding: .55rem .7rem;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
  color: var(--ink);
}
.field textarea { min-height: 5.5rem; resize: vertical; }
.choices { display: flex; gap: 1.4rem; flex-wrap: wrap; padding: .3rem 0; }
.choices label { font-weight: 400; display: flex; align-items: center; gap: .4rem; }
.notice {
  background: var(--mist);
  border-left: 4px solid var(--steel);
  padding: .9rem 1.1rem;
  font-size: .95rem;
  margin: 1.2rem 0;
}
.alert-ok {
  background: #e7f3e7;
  border-left: 4px solid #3d7a3d;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
}
.alert-err {
  background: #f9e9e5;
  border-left: 4px solid var(--brick);
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
}

@media (max-width: 820px) {
  .argument { grid-template-columns: 1fr; }
  .argument figure { position: static; max-width: 480px; }
  .days { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}