/* style.css — Southeastern Clinical Consulting (SECC) */

:root,
[data-theme='light'] {
  /* Surfaces — warm parchment */
  --color-bg: #faf7f0;
  --color-surface: #ffffff;
  --color-surface-2: #fdfcf9;
  --color-surface-offset: #f1ece1;
  --color-surface-offset-2: #e9e2d3;
  --color-divider: #e2dccc;
  --color-border: #d6ceb8;

  /* Text — deep charcoal-teal */
  --color-text: #1e2624;
  --color-text-muted: #5c6864;
  --color-text-faint: #646967;
  --color-text-inverse: #faf7f0;

  /* Primary accent — brand navy */
  --color-primary: #0b3d63;
  --color-primary-hover: #082c48;
  --color-primary-active: #051d30;
  --color-primary-highlight: #dde7f0;

  /* Functional roles */
  --color-warning: #a15a2e;
  --color-warning-highlight: #ecdccb;
  --color-success: #3f7a4d;
  --color-success-highlight: #d8e6d4;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px oklch(0.25 0.02 175 / 0.08);
  --shadow-md: 0 6px 20px oklch(0.25 0.02 175 / 0.10);
  --shadow-lg: 0 16px 40px oklch(0.25 0.02 175 / 0.14);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  --font-display: 'Cabinet Grotesk', 'General Sans', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', 'Helvetica Neue', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #121613;
  --color-surface: #171b18;
  --color-surface-2: #1a1f1c;
  --color-surface-offset: #1d221f;
  --color-surface-offset-2: #232a25;
  --color-divider: #262b27;
  --color-border: #343a35;

  --color-text: #dbe0dc;
  --color-text-muted: #93a19b;
  --color-text-faint: #8a978e;
  --color-text-inverse: #0d100e;

  --color-primary: #5daee0;
  --color-primary-hover: #7cc0ea;
  --color-primary-active: #4a93c2;
  --color-primary-highlight: #1c3040;

  --color-warning: #d19366;
  --color-warning-highlight: #3a3128;
  --color-success: #7fbb8b;
  --color-success-highlight: #24322a;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 20px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.45);
}

/* Type scale */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 4.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
}

/* ---------- Layout primitives ---------- */
.wrap {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-12));
}
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.section--tight {
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
}

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition:
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.header--hidden {
  transform: translateY(-100%);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  letter-spacing: 0.01em;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
.brand-mark img {
  display: block;
  height: 48px;
  width: auto;
}
@media (max-width: 560px) {
  .brand-mark img { height: 38px; }
}
.brand-sub {
  display: block;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-links {
  display: flex;
  gap: var(--space-6);
}
.nav-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current='page'] {
  color: var(--color-text);
  border-color: var(--color-primary);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.theme-toggle {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}
.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    inset: 64px var(--space-4) auto var(--space-4);
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-divider);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    gap: var(--space-1);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform 220ms cubic-bezier(0.16,1,0.3,1), opacity 220ms;
  }
  .nav-links.is-open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    padding: var(--space-3) var(--space-2);
    border-bottom: none;
    border-radius: var(--radius-sm);
  }
  .nav-links a:hover { background: var(--color-surface-offset); }
  .nav-toggle { display: inline-flex; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}
.btn--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------- Hero ---------- */
.hero {
  display: grid;
  gap: clamp(var(--space-8), 6vw, var(--space-16));
  align-items: center;
  padding-block: clamp(var(--space-12), 9vw, var(--space-24));
}
.hero--split {
  grid-template-columns: 1.05fr 0.95fr;
}
@media (max-width: 900px) {
  .hero--split { grid-template-columns: 1fr; }
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  letter-spacing: -0.005em;
}
h3, h4 {
  font-weight: 500;
}
h1.display, .display-1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  color: var(--color-text);
}
h2.display, .display-2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-block: var(--space-5) var(--space-8);
  max-width: 56ch;
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.hero-figure {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-divider);
  box-shadow: var(--shadow-lg);
}
.hero-figure img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- Section header ---------- */
.section-head {
  max-width: 60ch;
  margin-bottom: clamp(var(--space-8), 5vw, var(--space-12));
}
.section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-top: var(--space-3);
}
.section-head.center {
  margin-inline: auto;
  text-align: center;
}

/* ---------- Cards / grid ---------- */
.grid {
  display: grid;
  gap: var(--space-6);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  min-width: 0;
}
.card-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.card-icon--emoji {
  font-size: 22px;
  line-height: 1;
  position: relative;
  overflow: visible;
}
.card-icon--emoji .icon-badge {
  position: absolute;
  bottom: -6px;
  right: -6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-surface);
  box-shadow: var(--shadow-sm);
  display: grid;
  place-items: center;
  font-size: 11px;
}
.card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}
.card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ---------- Tag / badge ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.tag--accent {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-color: transparent;
}
.tag--pending {
  background: var(--color-warning-highlight);
  color: var(--color-warning);
  border-color: transparent;
}
.tag--featured {
  font-size: var(--text-base);
  padding: var(--space-2) var(--space-5);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.card-icon--featured {
  width: 76px;
  height: 76px;
  margin-bottom: var(--space-6);
}
.card-icon--featured svg:first-child {
  width: 40px;
  height: 40px;
}
.card-icon--featured .icon-badge {
  width: 34px;
  height: 34px;
  bottom: -10px;
  right: -10px;
  border-width: 3px;
}
.card-icon--featured .icon-badge svg {
  width: 20px;
  height: 20px;
}
.card--featured {
  padding: clamp(var(--space-8), 5vw, var(--space-16));
  overflow: visible;
}
.card--featured h2 {
  font-size: var(--text-2xl) !important;
  line-height: 1.12;
  overflow-wrap: break-word;
}

/* ---------- Research topic blocks ---------- */
.topic {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
  border-top: 1px solid var(--color-divider);
}
.topic:first-of-type { border-top: none; }
.topic-num {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-weight: 700;
}
.topic h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-block: var(--space-2) var(--space-3);
}
.topic p {
  color: var(--color-text-muted);
}
.topic .cite {
  display: block;
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.topic .cite a { color: var(--color-text-muted); }

/* ---------- Timeline / process ---------- */
.process {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-5);
}
.process--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) { .process { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .process { grid-template-columns: 1fr; } }
.process-step {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-divider);
}
.process-step .n {
  font-family: var(--font-display);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  display: block;
}
.process-step h4 { font-size: var(--text-sm); margin-bottom: var(--space-1); }
.process-step p { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 6vw, var(--space-16));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.cta-band h2 { font-family: var(--font-display); font-size: var(--text-xl); max-width: 40ch; }
.cta-band p { color: color-mix(in oklab, var(--color-text-inverse) 80%, transparent); margin-top: var(--space-2); }
.cta-band .btn--primary {
  background: var(--color-text-inverse);
  color: var(--color-primary);
}
.cta-band .btn--primary:hover {
  background: color-mix(in oklab, var(--color-text-inverse) 88%, var(--color-primary));
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
@media (max-width: 800px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }
.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  min-width: 0;
}
.contact-card .card-icon { margin-inline: auto; }
.contact-card a { color: var(--color-primary); text-decoration: none; font-weight: 600; overflow-wrap: break-word; word-break: normal; font-size: var(--text-sm); }
.contact-card a:hover { text-decoration: underline; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12);
  background: var(--color-surface-offset);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-display); font-weight: 700; }
.footer-brand .brand-mark img { height: 40px; }
.footer-links { display: flex; gap: var(--space-8); flex-wrap: wrap; }
.footer-col h5 { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-faint); margin-bottom: var(--space-3); }
.footer-col a { display: block; font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none; margin-bottom: var(--space-2); }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-newsletter {
  margin-top: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-6);
}
.footer-newsletter h5 { font-family: var(--font-display); font-size: var(--text-base); color: var(--color-text); margin-bottom: var(--space-1); }
.footer-newsletter p { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 34ch; margin: 0; }
.newsletter-form {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.newsletter-form input[type='email'] {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-sm);
  min-width: 220px;
}
.newsletter-form input[type='email']:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.btn--sm { padding: var(--space-2) var(--space-5); font-size: var(--text-xs); }
.newsletter-status { display: block; font-size: var(--text-xs); margin-top: var(--space-2); }
.newsletter-status--error { color: var(--color-error); }
.newsletter-status--success { color: var(--color-success); }
@media (max-width: 640px) {
  .footer-newsletter { flex-direction: column; }
  .newsletter-form { width: 100%; }
  .newsletter-form input[type='email'] { flex: 1; min-width: 0; }
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 700ms cubic-bezier(0.16,1,0.3,1), transform 700ms cubic-bezier(0.16,1,0.3,1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- Page hero (interior pages) ---------- */
.page-hero {
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
  border-bottom: 1px solid var(--color-divider);
}
.page-hero .display-1 { font-size: var(--text-xl); }
.breadcrumb {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.breadcrumb a { color: var(--color-text-faint); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-primary); }

/* ---------- Sign-up form (Participate page) ---------- */
.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 5vw, var(--space-12));
  box-shadow: var(--shadow-md);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
.form-grid .form-field--full { grid-column: 1 / -1; }
.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-field label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.form-field .form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 400;
}
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-base);
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
}
.form-field textarea { resize: vertical; min-height: 96px; }
.form-consent {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.form-consent input[type='checkbox'] {
  width: 18px;
  height: 18px;
  flex: none;
  margin-top: 2px;
  accent-color: var(--color-primary);
}
.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.form-status {
  font-size: var(--text-sm);
  font-weight: 600;
}
.form-status--error { color: var(--color-warning); }
.form-status--success { color: var(--color-success); }
.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 62ch;
}
.form-success-panel {
  text-align: center;
  padding: clamp(var(--space-8), 5vw, var(--space-12)) var(--space-4);
}
.form-success-panel .card-icon {
  margin-inline: auto;
  width: 56px;
  height: 56px;
}
@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
}