:root {
  --night-0: #020a09;
  --night-1: #05221e;
  --night-2: #0a322c;
  --emerald: #4ade80;
  --emerald-deep: #0d9488;
  --cream: #e8fbf5;
  --cream-soft: #b8d4ce;
  --gold: #e8dc7a;
  --ink-soft: rgba(232, 251, 245, 0.78);
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Literata", Georgia, serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--cream);
  background: var(--night-0);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* —— Ciel animé —— */
.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(45, 158, 140, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 40% at 85% 20%, rgba(13, 148, 136, 0.12), transparent 50%),
    linear-gradient(180deg, var(--night-0) 0%, var(--night-1) 45%, var(--night-2) 100%);
}

#stars {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sky-glow {
  position: absolute;
  inset: auto 0 0;
  height: 35%;
  background: linear-gradient(180deg, transparent, rgba(6, 31, 28, 0.9));
}

/* —— Topbar —— */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  backdrop-filter: blur(14px);
  background: rgba(2, 10, 9, 0.55);
  border-bottom: 1px solid rgba(184, 212, 206, 0.08);
}

.brand-mark,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand-logo {
  display: block;
  height: clamp(4.25rem, 9vw, 5.75rem);
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 14px rgba(74, 222, 128, 0.4));
}

.footer .brand-logo {
  height: clamp(5rem, 12vw, 7rem);
}

.topbar-end {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  font-size: 0.92rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.2rem;
  border: 1px solid rgba(184, 212, 206, 0.22);
  border-radius: 999px;
  background: rgba(2, 18, 16, 0.45);
}

.lang-btn {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.lang-btn:hover {
  color: var(--cream);
}

.lang-btn.is-active {
  background: rgba(110, 231, 183, 0.18);
  color: var(--cream);
}

html[data-lang="zh"] body,
html[data-lang="zh"] .btn,
html[data-lang="zh"] .field input,
html[data-lang="zh"] .lang-btn {
  font-family: "Noto Serif SC", "Literata", Georgia, serif;
}

html[data-lang="zh"] .brand-hero,
html[data-lang="zh"] h1,
html[data-lang="zh"] h2,
html[data-lang="zh"] h3,
html[data-lang="zh"] .constellation-label {
  font-family: "Noto Serif SC", "Fraunces", Georgia, serif;
}

.nav a {
  color: var(--ink-soft);
  transition: color 0.25s var(--ease);
}

.nav a:hover {
  color: var(--cream);
}

.nav-cta {
  padding: 0.45rem 0.95rem;
  border: 1px solid rgba(74, 222, 128, 0.35);
  border-radius: 999px;
  color: var(--emerald) !important;
}

@media (max-width: 720px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .topbar {
    flex-wrap: wrap;
  }

  .lang-btn {
    padding: 0.3rem 0.45rem;
    font-size: 0.72rem;
  }
}

/* —— Hero —— */
.hero {
  min-height: min(100vh, 920px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(2.5rem, 8vh, 5rem) clamp(1.25rem, 4vw, 3rem) 4rem;
}

.brand-hero {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 9vw, 6.5rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--cream);
  text-shadow: 0 0 40px rgba(74, 222, 128, 0.25);
  animation: rise 1.1s var(--ease) both;
}

.hero h1 {
  margin: 0 0 1rem;
  max-width: 14ch;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.15rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--cream-soft);
  animation: rise 1.1s var(--ease) 0.12s both;
}

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34ch;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--ink-soft);
  animation: rise 1.1s var(--ease) 0.22s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  animation: rise 1.1s var(--ease) 0.32s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.45rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 500;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, #6ee7b7, #0d9488);
  color: #04201c;
}

.btn-ghost {
  border: 1px solid rgba(184, 212, 206, 0.35);
  color: var(--cream);
}

.btn-wide {
  width: min(100%, 320px);
}

.hero-visual {
  display: flex;
  justify-content: center;
  animation: float-in 1.4s var(--ease) 0.2s both;
}

.constellation {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 320 / 220;
}

.constellation .lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.constellation .lines path {
  fill: none;
  stroke: rgba(143, 252, 232, 0.55);
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-dasharray: 420;
  stroke-dashoffset: 420;
  animation: draw-line 2.4s var(--ease) 0.5s forwards;
  filter: drop-shadow(0 0 6px rgba(94, 234, 212, 0.5));
}

.star {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #f5fffc;
  box-shadow: 0 0 16px 4px rgba(94, 234, 212, 0.65);
  animation: pulse-star 3.2s ease-in-out infinite;
}

.s1 { left: 10%; top: 52%; animation-delay: 0s; }
.s2 { left: 28%; top: 18%; animation-delay: 0.4s; }
.s3 { left: 50%; top: 56%; animation-delay: 0.8s; }
.s4 { left: 72%; top: 14%; animation-delay: 1.1s; }
.s5 { left: 88%; top: 46%; animation-delay: 1.5s; }

.constellation-label {
  position: absolute;
  left: 50%;
  bottom: -0.2rem;
  transform: translateX(-50%);
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--gold);
  opacity: 0.85;
  text-shadow: 0 0 12px rgba(74, 222, 128, 0.55);
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2rem;
  }

  .hero-visual {
    order: -1;
    max-width: 280px;
    margin: 0 auto;
  }

  .brand-hero {
    text-align: center;
  }

  .hero h1,
  .hero-lead {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }
}

/* —— Sections —— */
.section {
  padding: clamp(4rem, 10vh, 7rem) clamp(1.25rem, 4vw, 3rem);
}

.section-inner {
  max-width: 720px;
  margin: 0 auto;
}

.section h2 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.section p {
  margin: 0;
  font-size: 1.12rem;
  color: var(--ink-soft);
}

.essence {
  border-top: 1px solid rgba(184, 212, 206, 0.1);
}

.steps {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.75rem;
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.1rem;
  align-items: start;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(184, 212, 206, 0.12);
}

.step-num {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--emerald);
  letter-spacing: 0.06em;
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
}

.steps p {
  font-size: 1.02rem;
}

.rene-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
  max-width: 960px;
}

.rene-copy .rene-quote {
  margin-top: 1.75rem;
}

.rene-quote {
  margin: 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid rgba(232, 220, 122, 0.25);
}

.rene-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  font-style: italic;
  color: var(--cream);
  line-height: 1.45;
}

.rene-quote cite {
  display: block;
  margin-top: 1rem;
  font-style: normal;
  font-size: 0.9rem;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.rene-portrait-wrap {
  margin: 0;
}

.rene-portrait {
  display: block;
  width: 100%;
  max-height: min(58vh, 420px);
  object-fit: cover;
  object-position: center top;
  filter: drop-shadow(0 0 28px rgba(74, 222, 128, 0.22));
}

.rene-portrait-wrap figcaption {
  margin-top: 0.65rem;
  font-size: 0.9rem;
  color: rgba(184, 212, 206, 0.7);
}

@media (max-width: 760px) {
  .rene-layout {
    grid-template-columns: 1fr;
  }
}

.rejoindre {
  text-align: center;
}

.rejoindre .section-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.rejoindre-lead {
  max-width: 42ch;
  margin-bottom: 1.75rem !important;
}

.signup-form {
  width: min(100%, 26rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
}

.signup-form .hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.field input {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(184, 212, 206, 0.28);
  border-radius: 0.85rem;
  background: rgba(2, 18, 16, 0.55);
  color: var(--cream);
  font: inherit;
  outline: none;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.field input::placeholder {
  color: rgba(184, 212, 206, 0.4);
}

.field input:focus {
  border-color: rgba(110, 231, 183, 0.55);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.22);
}

.choices {
  margin: 0.15rem 0 0.35rem;
  padding: 0;
  border: 0;
}

.choices legend {
  padding: 0;
  margin-bottom: 0.55rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-bottom: 0.55rem;
  font-size: 0.92rem;
  color: var(--cream-soft);
  cursor: pointer;
}

.check input {
  margin-top: 0.2rem;
  accent-color: var(--emerald);
}

.signup-form .btn-wide {
  width: 100%;
  margin-top: 0.35rem;
  border: 0;
  cursor: pointer;
}

.form-success {
  width: min(100%, 26rem);
  padding: 1.25rem 0 0.5rem;
}

.form-success p {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--cream);
}

.form-success-sub {
  margin-top: 0.55rem !important;
  font-family: var(--font-body) !important;
  font-size: 0.98rem !important;
  color: var(--ink-soft) !important;
}

.fine-print {
  margin-top: 1.25rem !important;
  max-width: 46ch;
  font-size: 0.85rem !important;
  color: rgba(184, 212, 206, 0.55) !important;
}

/* —— Footer —— */
.footer {
  padding: 3rem clamp(1.25rem, 4vw, 3rem) 2.5rem;
  border-top: 1px solid rgba(184, 212, 206, 0.1);
  text-align: center;
}

.footer-brand {
  justify-content: center;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.footer p {
  margin: 0.25rem 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.footer-legal {
  margin-top: 1rem !important;
  font-size: 0.8rem !important;
  color: rgba(184, 212, 206, 0.45) !important;
}

/* —— Motion —— */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float-in {
  from {
    opacity: 0;
    transform: scale(0.92) translateY(12px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes draw-line {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes pulse-star {
  0%,
  100% {
    opacity: 0.7;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.25);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}