/* ============================================================
   photosynthese.css — Chlorophylle & Lumière
   Palette : #071a07 forêt | #b5e853 chlorophylle | #ffe033 solaire | #ff8c00 orange lumière
   Polices  : Fraunces (display) + Lora (corps) + Fira Mono
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,700;0,9..144,900;1,9..144,400;1,9..144,700&family=Lora:ital,wght@0,400;0,600;1,400&family=Fira+Mono:wght@400;500&display=swap');

:root {
  --deep:    #071a07;
  --forest:  #0d2b0d;
  --forest2: #163d16;
  --forest3: #1f5221;
  --card:    #0e2410;
  --border:  #1a3d1a;
  --border2: #245824;
  --chloro:  #b5e853;
  --chloro2: #8bc34a;
  --solar:   #ffe033;
  --solar2:  #f5c400;
  --orange:  #ff9800;
  --amber:   #ffb74d;
  --red:     #ef5350;
  --blue:    #64b5f6;
  --text:    #9dc98a;
  --text-hi: #e8f5e0;
  --muted:   #4a7a42;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Lora', Georgia, serif;
  background: var(--deep);
  color: var(--text);
  line-height: 1.8;
  font-size: 1.03rem;
  overflow-x: hidden;
}

/* ── DAPPLED LIGHT OVERLAY ────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 70% 10%, rgba(255,224,51,.08) 0%, transparent 50%),
    radial-gradient(ellipse 40% 50% at 20% 60%, rgba(181,232,83,.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 30% at 90% 80%, rgba(255,152,0,.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  animation: light-shift 12s ease-in-out infinite alternate;
}
@keyframes light-shift {
  0%  { opacity: 1; }
  100%{ opacity: .7; }
}

/* ── PROGRESS BAR ─────────────────────────────── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--forest3), var(--chloro), var(--solar));
  z-index: 1000;
  box-shadow: 0 0 12px var(--chloro);
  transition: width .1s linear;
}

/* ── NAV ──────────────────────────────────────── */
nav {
  position: fixed;
  top: 3px; left: 0; right: 0;
  z-index: 900;
  background: rgba(7,26,7,.95);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border2);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 32px;
  height: 54px;
  overflow-x: auto;
}
.nav-brand {
  font-family: 'Fraunces', serif;
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--chloro);
  text-decoration: none;
  letter-spacing: .01em;
  margin-right: 22px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-brand::before {
  content: '☀';
  font-size: 1rem;
  color: var(--solar);
  animation: spin-sun 8s linear infinite;
  display: inline-block;
}
@keyframes spin-sun { to { transform: rotate(360deg); } }

nav a:not(.nav-brand) {
  font-family: 'Fira Mono', monospace;
  font-size: .67rem;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 11px;
  border-radius: 4px;
  white-space: nowrap;
  transition: color .2s, background .2s;
  letter-spacing: .04em;
  text-transform: uppercase;
}
nav a:not(.nav-brand):hover,
nav a.active {
  color: var(--chloro);
  background: rgba(181,232,83,.08);
}

/* ── HERO ─────────────────────────────────────── */
.hero {
  position: relative;
  padding: 115px 56px 80px;
  overflow: hidden;
  z-index: 1;
  border-bottom: 1px solid var(--border);
}
.hero::after {
  content: '';
  position: absolute;
  top: -120px; right: -180px;
  width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(255,224,51,.14) 0%, rgba(181,232,83,.06) 40%, transparent 70%);
  border-radius: 50%;
  animation: solar-pulse 6s ease-in-out infinite;
  pointer-events: none;
}
@keyframes solar-pulse {
  0%,100%{ transform: scale(1);   opacity:1;  }
  50%    { transform: scale(1.1); opacity:.7; }
}

.hero-inner { max-width: 820px; position: relative; z-index: 2; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'Fira Mono', monospace;
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--solar);
  border: 1px solid rgba(255,224,51,.3);
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
  background: rgba(255,224,51,.04);
}
.hero h1 {
  font-family: 'Fraunces', serif;
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 900;
  line-height: .92;
  color: var(--text-hi);
  margin-bottom: 22px;
  letter-spacing: -.02em;
}
.hero h1 .accent { color: var(--chloro); }
.hero h1 .light-word { color: var(--solar); }
.hero p.lead {
  font-size: 1.08rem;
  color: var(--text);
  max-width: 640px;
  line-height: 1.8;
  font-style: italic;
}

/* ── EQUATION BANNER ──────────────────────────── */
.eq-banner {
  margin-top: 32px;
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.eq-label {
  font-family: 'Fira Mono', monospace;
  font-size: .65rem;
  color: var(--muted);
  letter-spacing: .1em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.eq-formula {
  font-family: 'Lora', serif;
  font-size: 1.05rem;
  color: var(--text-hi);
  flex: 1;
  line-height: 1.6;
}
.eq-formula .reactant { color: var(--blue);   }
.eq-formula .product  { color: var(--chloro); }
.eq-formula .energy   { color: var(--solar);  }
.eq-formula .arrow    { color: var(--muted); margin: 0 8px; }

/* ── STATS ────────────────────────────────────── */
.kpi-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}
.kpi {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 10px;
  padding: 14px 20px;
  flex: 1;
  min-width: 130px;
  position: relative;
  overflow: hidden;
}
.kpi::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--chloro), var(--solar));
}
.kpi .kv {
  font-family: 'Fraunces', serif;
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--solar);
  line-height: 1;
  display: block;
}
.kpi .kl {
  font-family: 'Fira Mono', monospace;
  font-size: .62rem;
  color: var(--muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ── LAYOUT ───────────────────────────────────── */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 64px 40px;
  position: relative;
  z-index: 1;
}
.two-col {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 36px;
}
@media (max-width: 940px) { .two-col { grid-template-columns: 1fr; } }

/* ── SECTIONS ─────────────────────────────────── */
.section {
  margin-bottom: 70px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}
.section.visible { opacity: 1; transform: none; }

.sec-label {
  font-family: 'Fira Mono', monospace;
  font-size: .65rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--solar2);
  margin-bottom: 8px;
}
.section h2 {
  font-family: 'Fraunces', serif;
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-hi);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border2);
  margin-bottom: 24px;
  position: relative;
}
.section h2::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0;
  height: 2px; width: 56px;
  background: var(--chloro);
}
.section h3 {
  font-family: 'Fraunces', serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--chloro);
  margin: 26px 0 10px;
}

/* ── CARDS ────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: rgba(181,232,83,.35); transform: translateY(-2px); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin: 18px 0;
}

/* ── REACT/PRODUIT TAGS ───────────────────────── */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 3px;
  font-family: 'Fira Mono', monospace;
  font-size: .64rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.tag-chloro { background: rgba(181,232,83,.1); color: var(--chloro); border: 1px solid rgba(181,232,83,.25); }
.tag-solar  { background: rgba(255,224,51,.1);  color: var(--solar);  border: 1px solid rgba(255,224,51,.25); }
.tag-blue   { background: rgba(100,181,246,.1); color: var(--blue);   border: 1px solid rgba(100,181,246,.25);}
.tag-orange { background: rgba(255,152,0,.1);   color: var(--orange); border: 1px solid rgba(255,152,0,.25); }
.tag-red    { background: rgba(239,83,80,.1);   color: var(--red);    border: 1px solid rgba(239,83,80,.25); }

/* ── BOX ──────────────────────────────────────── */
.box {
  border-radius: 10px;
  padding: 14px 18px;
  margin: 16px 0;
  border-left: 4px solid;
  font-size: .96rem;
}
.box-chloro { background: rgba(181,232,83,.05); border-color: var(--chloro); }
.box-solar  { background: rgba(255,224,51,.05); border-color: var(--solar);  }
.box-blue   { background: rgba(100,181,246,.05);border-color: var(--blue);   }
.box-warn   { background: rgba(239,83,80,.05);  border-color: var(--red);    }

/* ── TABLE ────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: .92rem;
}
th {
  background: var(--forest2);
  color: var(--chloro);
  font-family: 'Fira Mono', monospace;
  font-size: .67rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border2);
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}
tr:nth-child(even) td { background: rgba(14,36,16,.5); }
tr:hover td { background: rgba(181,232,83,.03); }

/* ── PHASE STEPS ──────────────────────────────── */
.phase-box {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 14px;
  padding: 22px;
  margin: 16px 0;
  position: relative;
  overflow: hidden;
}
.phase-box.light-phase {
  border-color: rgba(255,224,51,.4);
  background: rgba(255,224,51,.03);
}
.phase-box.dark-phase {
  border-color: rgba(181,232,83,.4);
  background: rgba(181,232,83,.03);
}
.phase-box::before {
  content: attr(data-phase);
  position: absolute;
  top: 12px; right: 16px;
  font-family: 'Fira Mono', monospace;
  font-size: .62rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  opacity: .4;
  color: var(--text-hi);
}
.phase-title {
  font-family: 'Fraunces', serif;
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 10px;
}
.light-phase .phase-title { color: var(--solar); }
.dark-phase  .phase-title { color: var(--chloro); }

/* ── PIGMENT SPECTRUM ─────────────────────────── */
.spectrum-bar {
  height: 24px;
  border-radius: 6px;
  background: linear-gradient(90deg,
    #7B00D4 0%,
    #4400FF 8%,
    #0055FF 18%,
    #00AAFF 30%,
    #00FFAA 44%,
    #00FF00 52%,
    #AAFF00 60%,
    #FFFF00 68%,
    #FFAA00 78%,
    #FF4400 88%,
    #AA0000 100%
  );
  margin: 10px 0 6px;
  position: relative;
}
.spectrum-labels {
  display: flex;
  justify-content: space-between;
  font-family: 'Fira Mono', monospace;
  font-size: .62rem;
  color: var(--muted);
  letter-spacing: .04em;
}
.chloro-absorb {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.abs-band {
  padding: 4px 12px;
  border-radius: 4px;
  font-family: 'Fira Mono', monospace;
  font-size: .7rem;
  font-weight: 500;
}
.abs-blue   { background: rgba(68,0,255,.3);  color: #99aaff; border: 1px solid rgba(68,0,255,.4);  }
.abs-red    { background: rgba(255,68,0,.3);   color: #ffaaaa; border: 1px solid rgba(255,68,0,.4);   }
.abs-orange { background: rgba(255,150,0,.3);  color: #ffcc88; border: 1px solid rgba(255,150,0,.4);  }

/* ── C3/C4/CAM TABLE ──────────────────────────── */
.pathway-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.pw-card {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 18px;
  transition: transform .2s;
  cursor: default;
}
.pw-card:hover { transform: translateY(-3px); border-color: var(--chloro); }
.pw-card.c3  { border-top: 3px solid var(--chloro); }
.pw-card.c4  { border-top: 3px solid var(--solar);  }
.pw-card.cam { border-top: 3px solid var(--orange);  }
.pw-name {
  font-family: 'Fraunces', serif;
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 6px;
}
.pw-card.c3  .pw-name { color: var(--chloro); }
.pw-card.c4  .pw-name { color: var(--solar);  }
.pw-card.cam .pw-name { color: var(--orange);  }
.pw-sub { font-size: .8rem; color: var(--muted); margin-bottom: 10px; }
.pw-desc { font-size: .87rem; color: var(--text); line-height: 1.6; }

/* ── SIDEBAR ──────────────────────────────────── */
.sidebar { position: sticky; top: 68px; }
.sb-card {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 16px;
}
.sb-card h3 {
  font-family: 'Fraunces', serif;
  font-size: .95rem;
  font-weight: 700;
  color: var(--chloro);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.sb-toc a {
  display: block;
  padding: 5px 8px;
  font-family: 'Fira Mono', monospace;
  font-size: .67rem;
  color: var(--muted);
  text-decoration: none;
  border-radius: 4px;
  transition: color .2s, background .2s;
  letter-spacing: .04em;
}
.sb-toc a:hover, .sb-toc a.active {
  color: var(--chloro);
  background: rgba(181,232,83,.07);
}

ul { padding-left: 22px; }
li { margin: 5px 0; }
ul li::marker { color: var(--chloro2); }
strong { color: var(--text-hi); font-weight: 600; }
code {
  font-family: 'Fira Mono', monospace;
  background: var(--forest2);
  color: var(--solar);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: .87em;
}
sub, sup { font-size: .75em; }

#back-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 44px; height: 44px;
  background: var(--forest3);
  color: var(--solar);
  border: 1px solid var(--solar2);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity .3s, transform .3s;
  z-index: 800;
}
#back-top.visible { opacity: 1; pointer-events: auto; }
#back-top:hover { transform: translateY(-4px); }

footer {
  border-top: 1px solid var(--border);
  padding: 28px 40px;
  text-align: center;
  color: var(--muted);
  font-family: 'Fira Mono', monospace;
  font-size: .7rem;
  letter-spacing: .06em;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .hero { padding: 88px 22px 50px; }
  .container { padding: 36px 18px; }
  nav { padding: 0 14px; }
}