/* =========================================================
   See It Differently — shared stylesheet
   Brand tokens
   ========================================================= */

:root {
  --navy: #010e21;
  --sky: #7fc3de;
  --white: #ffffff;
  --bg-page: #fafbfc;
  --pale: #f4f7f9;
  --slate: #4a5568;
  --link: #185fa5;
  --on-sky: #042c53;

  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Source Serif 4', Georgia, serif;

  --max-width: 1140px;
  --radius: 6px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-display);
  color: var(--navy);
  background: var(--bg-page);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* =========================================================
   Header / Nav
   ========================================================= */

.site-header {
  border-bottom: 1px solid #e3e9ee;
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--navy);
}
.wordmark:hover { text-decoration: none; opacity: 0.85; }
.wordmark span { color: var(--link); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.main-nav ul {
  display: flex;
  gap: var(--space-4);
  list-style: none;
}

.main-nav a {
  color: var(--navy);
  font-weight: 500;
  font-size: 0.95rem;
}
.main-nav a:hover { color: var(--link); text-decoration: none; }
.main-nav a.active { color: var(--link); }

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid #e3e9ee;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .main-nav.open { max-height: 320px; }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) var(--space-3) var(--space-3);
  }
  .main-nav li { border-bottom: 1px solid #eef2f5; }
  .main-nav a { display: block; padding: var(--space-2) 0; }
}

/* =========================================================
   Buttons
   ========================================================= */

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--sky);
  color: var(--on-sky);
}
.btn-primary:hover {
  box-shadow: 0 6px 18px rgba(127,195,222,0.45);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--navy);
}
.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
}

.btn-ghost {
  color: var(--link);
  padding: 0.75rem 0;
  font-weight: 600;
}

/* =========================================================
   Hero + diplopia signature effect
   ========================================================= */

.hero {
  padding: var(--space-6) 0 var(--space-5);
}

.hero .eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--link);
  margin-bottom: var(--space-2);
}

.diplopia {
  position: relative;
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.diplopia::before {
  content: attr(data-text);
  position: absolute;
  left: 6px;
  top: 5px;
  color: var(--sky);
  opacity: 0.75;
  z-index: -1;
  transition: left 0.6s cubic-bezier(0.16, 1, 0.3, 1), top 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.6s ease;
}

.diplopia.converged::before {
  left: 0;
  top: 0;
  opacity: 0;
}

.hero-sub {
  max-width: 620px;
  margin-top: var(--space-3);
  font-size: 1.1rem;
  color: var(--slate);
}

.hero-cta {
  margin-top: var(--space-4);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* =========================================================
   Sections
   ========================================================= */

section { padding: var(--space-5) 0; }
.section-pale { background: var(--pale); }

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-4);
}

.section-head .eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--link);
  margin-bottom: var(--space-1);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  letter-spacing: -0.01em;
}

.section-head p {
  margin-top: var(--space-1);
  color: var(--slate);
}

/* =========================================================
   Card grids
   ========================================================= */

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid { grid-template-columns: 1fr; } }

.card {
  background: var(--white);
  border: 1px solid #e3e9ee;
  border-radius: var(--radius);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover {
  box-shadow: 0 10px 28px rgba(1,14,33,0.08);
  transform: translateY(-2px);
}

.card .tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--link);
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.3;
}

.card h3 a { color: var(--navy); }
.card h3 a:hover { color: var(--link); text-decoration: none; }

.card p { color: var(--slate); font-size: 0.92rem; }

.card .meta {
  font-size: 0.8rem;
  color: #8898a8;
  margin-top: auto;
  padding-top: var(--space-1);
}

.card.coming-soon {
  border-style: dashed;
  opacity: 0.85;
}
.card.coming-soon .tag { color: #8898a8; }

/* =========================================================
   Article body (Source Serif 4)
   ========================================================= */

.article-header {
  max-width: 720px;
  margin: 0 auto;
  padding-top: var(--space-5);
}

.article-header .tag {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--link);
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.01em;
  margin-top: var(--space-1);
}

.article-header .byline {
  margin-top: var(--space-2);
  color: var(--slate);
  font-size: 0.92rem;
}

.article-body {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-4) 0 var(--space-6);
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.75;
  color: #1c2733;
}

.article-body p { margin-bottom: var(--space-3); }

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: var(--space-4) 0 var(--space-2);
  color: var(--navy);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
  font-family: var(--font-display);
  font-size: 0.95rem;
}
.article-body th, .article-body td {
  border: 1px solid #e3e9ee;
  padding: 0.6rem 0.8rem;
  text-align: left;
}
.article-body th { background: var(--pale); font-weight: 600; }

.article-body blockquote {
  border-left: 3px solid var(--sky);
  padding-left: var(--space-3);
  color: var(--slate);
  font-style: italic;
  margin: var(--space-3) 0;
}

.faq {
  max-width: 720px;
  margin: var(--space-4) auto 0;
  font-family: var(--font-display);
}
.faq details {
  border-bottom: 1px solid #e3e9ee;
  padding: var(--space-2) 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; float: right; color: var(--link); }
.faq details[open] summary::after { content: '\2212'; }
.faq p { margin-top: var(--space-1); color: var(--slate); font-family: var(--font-body); }

/* =========================================================
   Placeholder notice (dev-only helper)
   ========================================================= */

.placeholder-flag {
  max-width: 720px;
  margin: var(--space-3) auto 0;
  padding: var(--space-2) var(--space-3);
  background: #fff8e6;
  border: 1px solid #f0dca0;
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: #6b5410;
}

/* =========================================================
   Contact layout
   ========================================================= */

.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 760px) {
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-4); }
}

.about-grid {
  grid-template-columns: 1fr 1.4fr !important;
}
@media (max-width: 760px) {
  .about-grid { grid-template-columns: 1fr !important; gap: var(--space-3) !important; }
}

/* =========================================================
   Forms
   ========================================================= */

form { max-width: 560px; }

.field { margin-bottom: var(--space-3); }

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.field input, .field select, .field textarea {
  width: 100%;
  font-family: var(--font-display);
  font-size: 1rem;
  padding: 0.65rem 0.75rem;
  border: 1.5px solid #d5dde3;
  border-radius: var(--radius);
  background: var(--white);
  color: var(--navy);
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--link);
  outline: none;
}

.field textarea { resize: vertical; min-height: 120px; }

.form-note { margin-top: var(--space-2); font-size: 0.85rem; color: var(--slate); }

/* =========================================================
   Footer
   ========================================================= */

.site-footer {
  border-top: 1px solid #e3e9ee;
  background: var(--navy);
  color: #b9c6d4;
  padding: var(--space-5) 0 var(--space-4);
  margin-top: var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-4);
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-3); }
}

.site-footer h4 {
  color: var(--white);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.site-footer a { color: #b9c6d4; }
.site-footer a:hover { color: var(--sky); }

.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 0.5rem; }

.footer-bottom {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid #17273c;
  font-size: 0.82rem;
  color: #7b8ba0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-1);
}

/* =========================================================
   Utility
   ========================================================= */

.center { text-align: center; }
.mt-0 { margin-top: 0; }