/* ================================================
   Avante Science — Shared Stylesheet
   Color palette: forest green
================================================ */
:root {
  --green-dark:   #1B4332;
  --green-mid:    #2D6A4F;
  --green-accent: #52B788;
  --green-light:  #95D5B2;
  --green-pale:   #D8F3DC;
  --white:        #ffffff;
  --text-dark:    #1a1a1a;
  --text-mid:     #444;
  --text-light:   #777;
  --radius:       12px;
  --radius-lg:    20px;
  --shadow:       0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.14);
  --transition:   0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.65;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a  { color: inherit; text-decoration: none; }

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 68px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.01em;
}

.nav-logo img { height: 40px; width: 40px; border-radius: 50%; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--green-pale);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.12);
  color: var(--white);
}

/* Language toggle */
#lang-toggle {
  background: var(--green-accent);
  color: var(--green-dark);
  border: none;
  border-radius: 20px;
  padding: 0.35rem 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  letter-spacing: 0.03em;
  margin-left: 0.5rem;
}

#lang-toggle:hover { background: var(--green-light); transform: scale(1.04); }

/* Mobile nav toggle */
.nav-burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-burger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 100%);
  color: var(--white);
  padding: 5rem 2rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(82,183,136,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: var(--green-pale);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero h1 em {
  font-style: normal;
  color: var(--green-light);
}

.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── BUTTONS ── */
.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 2px solid transparent;
}

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

.btn-primary {
  background: var(--green-accent);
  color: var(--green-dark);
}

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.5);
  color: var(--white);
}

.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }

.btn-dark {
  background: var(--green-dark);
  color: var(--white);
}

/* ── SECTIONS ── */
section { padding: 4rem 2rem; }

.section-inner { max-width: 1100px; margin: 0 auto; }

.section-label {
  display: inline-block;
  color: var(--green-mid);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--green-dark);
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-mid);
  max-width: 620px;
  margin-bottom: 2.5rem;
}

.section-alt { background: var(--green-pale); }
.section-dark { background: var(--green-dark); color: var(--white); }
.section-dark .section-title { color: var(--white); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.8); }

/* ── PORTAL CARDS ── */
.portal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.portal-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.portal-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--green-accent);
}

.portal-card .icon {
  background: var(--green-pale);
  width: 64px; height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green-dark);
  flex-shrink: 0;
}

.portal-card .icon iconify-icon { display: block; }

.portal-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green-dark);
}

.portal-card p {
  font-size: 0.9rem;
  color: var(--text-mid);
  line-height: 1.5;
  flex: 1;
}

.portal-card .btn { margin-top: 0.5rem; font-size: 0.88rem; padding: 0.55rem 1.25rem; }

/* ── STATS ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.stat-card {
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.15);
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--green-light);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-label { font-size: 0.9rem; color: rgba(255,255,255,0.8); }

/* ── TWO-COL LAYOUT ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.two-col img {
  border-radius: var(--radius-lg);
  width: 100%;
  height: 340px;
  object-fit: cover;
  box-shadow: var(--shadow);
}

/* ── EXPERIMENT CARDS ── */
.experiment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.experiment-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--green-accent);
  transition: transform var(--transition);
}

.experiment-card:hover { transform: translateY(-3px); }

.experiment-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.experiment-card h3 iconify-icon { color: var(--green-accent); flex-shrink: 0; }

.experiment-links { display: flex; flex-direction: column; gap: 0.5rem; }

.experiment-links a {
  font-size: 0.85rem;
  color: var(--green-mid);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--green-pale);
  transition: color var(--transition);
}

.experiment-links a:last-child { border-bottom: none; }
.experiment-links a:hover { color: var(--green-dark); }
.experiment-links a::before { content: '→'; font-size: 0.9rem; }

/* ── RUBRIC TABLE ── */
.rubric-table { width: 100%; border-collapse: collapse; margin-top: 1.5rem; }

.rubric-table th {
  background: var(--green-dark);
  color: var(--white);
  padding: 0.85rem 1rem;
  text-align: left;
  font-size: 0.9rem;
  font-weight: 600;
}

.rubric-table th:last-child,
.rubric-table td:last-child { text-align: center; }

.rubric-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--green-pale);
  font-size: 0.92rem;
}

.rubric-table tr:last-child td { border-bottom: none; font-weight: 700; background: var(--green-pale); }
.rubric-table tr:nth-child(even) td { background: #f9fffe; }

/* ── PARTNERS ── */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
  margin-top: 2rem;
}

.partner-chip {
  background: var(--white);
  border: 2px solid var(--green-pale);
  border-radius: var(--radius);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  color: var(--green-dark);
  font-size: 0.95rem;
}

/* ── CONTACT FORM ── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 560px;
}

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--green-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.7rem 1rem;
  border: 2px solid #e0e0e0;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--green-accent); }

.form-group textarea { resize: vertical; min-height: 130px; }

/* ── FOOTER ── */
footer {
  background: var(--green-dark);
  color: rgba(255,255,255,0.8);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-inner { max-width: 800px; margin: 0 auto; }

.footer-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 1.25rem 0;
}

.footer-links a {
  color: var(--green-light);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--white); }

.footer-copy { font-size: 0.8rem; color: rgba(255,255,255,0.45); margin-top: 1.5rem; }

/* ── PAGE HERO (inner pages) ── */
.page-hero {
  background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 100%);
  color: var(--white);
  padding: 3.5rem 2rem;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.page-hero p { font-size: 1.05rem; color: rgba(255,255,255,0.85); max-width: 600px; margin: 0 auto; }

/* ── CONTENT BLOCKS (portal pages) ── */
.content-block {
  max-width: 800px;
  margin: 0 auto;
}

.content-block h2 {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--green-dark);
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.content-block p { color: var(--text-mid); margin-bottom: 1rem; font-size: 1rem; }

.content-block ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 1rem 0 1.5rem;
}

.content-block ul li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.97rem;
  color: var(--text-mid);
}

.content-block ul li::before {
  content: '✓';
  color: var(--green-accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.btn-row { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }

.btn-green {
  background: var(--green-dark);
  color: var(--white);
  padding: 0.7rem 1.6rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
  display: inline-block;
}

.btn-green:hover { background: var(--green-mid); transform: translateY(-2px); }

.btn-green-outline {
  background: transparent;
  color: var(--green-dark);
  border: 2px solid var(--green-dark);
  padding: 0.68rem 1.6rem;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  display: inline-block;
}

.btn-green-outline:hover { background: var(--green-dark); color: var(--white); transform: translateY(-2px); }

/* ── EXPERIMENT TABS ── */
.exp-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--green-pale);
  margin-bottom: 2rem;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  padding: 0.75rem 1.5rem;
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--text-mid);
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 8px 8px 0 0;
  font-family: inherit;
}

.tab-btn.active {
  color: var(--green-dark);
  border-bottom-color: var(--green-dark);
  background: transparent;
}

.tab-btn:hover:not(.active) {
  color: var(--green-dark);
  background: var(--green-pale);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Coming-soon placeholder in experiment links */
.link-soon {
  font-size: 0.82rem;
  color: var(--text-light);
  font-style: italic;
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--green-pale);
}

.link-soon:last-child { border-bottom: none; }
.link-soon::before { content: '—'; font-size: 0.8rem; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0;
    background: var(--green-dark); padding: 1rem; gap: 0.25rem; }
  .nav-links.open { display: flex; }
  .nav-burger { display: flex; }
  .two-col { grid-template-columns: 1fr; }
  .two-col img { height: 240px; }
  section { padding: 3rem 1.25rem; }
  nav { padding: 0 1.25rem; position: relative; }
}

@media (max-width: 480px) {
  .portal-grid { grid-template-columns: 1fr; }
  .stats-grid  { grid-template-columns: 1fr 1fr; }
  .experiment-grid { grid-template-columns: 1fr; }
}