/* ==========================================================================
   Practicum Link — splash page
   Design tokens: warm paper + sage/ink palette pulled from the brand mark,
   Source Serif 4 for display, IBM Plex Sans for body/UI.
   ========================================================================== */

:root {
  --paper: #F6F4ED;
  --paper-dim: #ECE8DB;
  --ink: #201E19;
  --ink-soft: #4B4A41;
  --ink-faint: rgba(32, 30, 25, 0.62);
  --sage: #7E9B78;
  --sage-deep: #445E3E;
  --sage-pale: #DEE6D7;
  --ochre: #B9812F;
  --line: rgba(32, 30, 25, 0.15);
  --paper-rgb: 246, 244, 237;

  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --max: 1140px;
  --radius: 3px;
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
button { font-family: inherit; }
ul { margin: 0; padding: 0; list-style: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

:focus-visible {
  outline: 2px solid var(--sage-deep);
  outline-offset: 3px;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 28px; }

.eyebrow-divider {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: 0;
}

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}
.btn.btn-primary { background: var(--ink); color: var(--paper); }
.btn.btn-primary:hover { background: var(--sage-deep); }
.btn.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* ==========================================================================
   Nav
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(var(--paper-rgb), 0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand img { width: 30px; height: auto; opacity: 0.92; }
.brand span {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.94rem;
}
.nav-links a:hover { color: var(--ink); }
.nav-links .btn { padding: 10px 20px; }
.nav-toggle { display: none; }

@media (max-width: 700px) {
  .nav-links a:not(.btn) { display: none; }
  .nav-links { gap: 14px; }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 96px;
}
.hero .wrap {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 620px) 1fr;
  gap: 40px;
  align-items: start;
}
.hero-mark {
  position: absolute;
  top: 6%;
  right: -8%;
  width: 62%;
  min-width: 460px;
  opacity: 0.9;
  z-index: 1;
  pointer-events: none;
}
.hero-mark img { width: 100%; filter: brightness(0) saturate(100%) invert(9%) sepia(6%) saturate(600%) hue-rotate(50deg); opacity: 0.10; }

.hero h1 {
  font-size: clamp(2.3rem, 4.1vw, 3.55rem);
  line-height: 1.08;
  max-width: 13.5ch;
}
.hero-sub {
  margin-top: 22px;
  max-width: 46ch;
  font-size: 1.1rem;
  color: var(--ink-soft);
}
.hero-actions {
  margin-top: 34px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.founder-note {
  position: relative;
  z-index: 2;
  margin-top: 46px;
  max-width: 420px;
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  transform: rotate(-0.6deg);
}
.founder-note p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink);
}
.founder-note cite {
  display: block;
  margin-top: 12px;
  font-style: normal;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-mark { position: static; width: 78%; min-width: 0; margin: 34px auto 0; opacity: 1; }
  .hero-mark img { opacity: 0.16; }
  .founder-note { margin-top: 30px; max-width: 100%; transform: none; }
}

/* ==========================================================================
   Section shared
   ========================================================================== */
.section { padding: 96px 0; }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head h2 { font-size: clamp(1.7rem, 2.6vw, 2.3rem); line-height: 1.15; }
.section-head p { margin-top: 16px; color: var(--ink-soft); font-size: 1.05rem; }

/* ==========================================================================
   Who we serve
   ========================================================================== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.audience-card {
  background: var(--paper);
  padding: 38px 34px 40px;
}
.audience-card .icon { width: 40px; height: 40px; margin-bottom: 22px; }
.audience-card .icon svg { width: 100%; height: 100%; }
.audience-card h3 { font-size: 1.2rem; margin-bottom: 4px; }
.audience-card .audience-tag {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sage-deep);
  margin-bottom: 10px;
  font-weight: 600;
}
.audience-card ul { margin-top: 18px; display: flex; flex-direction: column; gap: 11px; }
.audience-card li {
  padding-left: 18px;
  position: relative;
  font-size: 0.97rem;
  color: var(--ink-soft);
  line-height: 1.5;
}
.audience-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sage);
}
@media (max-width: 860px) {
  .audience-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Mission band
   ========================================================================== */
.mission {
  background: var(--ink);
  color: var(--paper);
}
.mission .section-head p { color: rgba(246,244,237,0.72); }
.mission .section-head h2 { color: var(--paper); }
.mission-copy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.mission-block h3 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sage);
  margin-bottom: 14px;
  font-family: var(--font-body);
  font-weight: 600;
}
.mission-block p {
  font-family: var(--font-display);
  font-size: 1.28rem;
  line-height: 1.5;
}
.values-row {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  border-top: 1px solid rgba(246,244,237,0.18);
  padding-top: 40px;
}
.values-row h4 { font-size: 1rem; color: var(--paper); margin-bottom: 8px; }
.values-row p { font-size: 0.93rem; color: rgba(246,244,237,0.68); }
@media (max-width: 860px) {
  .mission-copy { grid-template-columns: 1fr; gap: 34px; }
  .values-row { grid-template-columns: 1fr; gap: 26px; }
}

/* ==========================================================================
   Join / signup
   ========================================================================== */
.join .section-head { max-width: 680px; }

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.tab {
  background: none;
  border: none;
  padding: 14px 4px;
  margin-right: 30px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink-faint);
  cursor: pointer;
  position: relative;
  top: 1px;
}
.tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
}
.tab:hover { color: var(--ink); }

.form-panel { display: none; }
.form-panel.is-active { display: block; }

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 26px;
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink);
}
.field .hint { font-size: 0.8rem; color: var(--ink-faint); font-weight: 400; }
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: 0.98rem;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--sage-deep);
}
.field textarea { resize: vertical; min-height: 96px; }

.check-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}
.check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.93rem;
  color: var(--ink-soft);
}
.check-item input { width: 16px; height: 16px; accent-color: var(--sage-deep); }

.form-footer {
  margin-top: 30px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.form-note { font-size: 0.85rem; color: var(--ink-faint); }

.form-status {
  margin-top: 18px;
  font-size: 0.92rem;
  padding: 12px 16px;
  border-radius: var(--radius);
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.success { background: var(--sage-pale); color: var(--sage-deep); }
.form-status.error { background: #F3DCD6; color: #8A3B24; }

.honeypot { position: absolute; left: -9999px; opacity: 0; }

@media (max-width: 700px) {
  .field-grid { grid-template-columns: 1fr; }
  .tab { margin-right: 20px; font-size: 0.9rem; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 46px 0;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.footer-brand img { width: 22px; height: auto; opacity: 0.7; }
.footer-brand span { font-family: var(--font-display); font-size: 1rem; }
.footer-meta { font-size: 0.85rem; color: var(--ink-faint); text-align: right; }
.footer-meta a { color: var(--ink-soft); text-decoration: underline; text-underline-offset: 2px; }

@media (max-width: 600px) {
  .site-footer .wrap { flex-direction: column; align-items: flex-start; text-align: left; }
  .footer-meta { text-align: left; }
}