/* ============================================================
   overview.css — UNIT INDEX / OVERVIEW FAMILY
   ------------------------------------------------------------
   Owns ONLY overview-page components: hero, essential question,
   lesson index, signature. All colors and type come from
   tokens.css — link tokens.css FIRST, then this file.
   This sheet declares no tokens of its own.
   ============================================================ */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--paper); color: var(--ink); }
body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.6;
  padding: 2.5rem 1.5rem 3rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.container { max-width: 880px; margin: 0 auto; }

/* EYEBROW */
.eyebrow {
  font-family: var(--font-body); font-size: 0.78rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--muted); text-align: center; margin-bottom: 1.25rem;
}
.eyebrow .sep { display: inline-block; margin: 0 0.6em; color: var(--accent-soft); }

/* HERO — portrait + framing */
.hero {
  display: grid; grid-template-columns: 240px 1fr; gap: 2.5rem;
  align-items: start; padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule); margin-bottom: 2.75rem;
}
.portrait-wrap { position: relative; }
.portrait {
  width: 100%; display: block; border: 1px solid var(--rule);
  box-shadow:
    0 1px 0 var(--paper),
    0 6px 22px color-mix(in srgb, var(--ink) 18%, transparent),
    0 18px 48px color-mix(in srgb, var(--ink) 10%, transparent);
  filter: saturate(0.92) contrast(1.02);
}
.portrait-caption {
  margin-top: 0.75rem; font-size: 0.78rem; line-height: 1.45;
  color: var(--muted); font-style: italic; text-align: center;
}
.portrait-caption strong { font-style: normal; font-weight: 500; color: var(--ink-soft); }

.hero-text { padding-top: 0.25rem; }
.unit-marker {
  font-family: var(--font-display); font-size: 0.95rem; font-weight: 600;
  letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.4rem;
}
.unit-marker::after {
  content: ""; display: block; width: 38px; height: 1px;
  background: var(--accent); margin-top: 0.6rem; opacity: 0.7;
}
.unit-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.6rem, 5.2vw, 3.6rem); line-height: 1.04;
  letter-spacing: -0.012em; margin: 0.6rem 0 0.4rem; color: var(--ink);
}
.unit-subtitle {
  font-family: var(--font-display); font-style: italic; font-weight: 400;
  font-size: 1.3rem; color: var(--accent); line-height: 1.3; margin: 0 0 1.2rem;
}
.unit-lede {
  font-family: var(--font-body); font-size: 1.05rem; line-height: 1.6;
  color: var(--ink-soft); margin: 0;
}
.unit-lede em { color: var(--accent); font-style: italic; }

/* ESSENTIAL QUESTION */
.essential-question {
  background: var(--paper-deep); border-left: 3px solid var(--accent);
  padding: 1.25rem 1.5rem; margin: 0 0 2.75rem; border-radius: 0 4px 4px 0;
}
.essential-question .label {
  font-family: var(--font-body); font-size: 0.72rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.5rem; font-weight: 600;
}
.essential-question .q {
  font-family: var(--font-display); font-style: italic; font-weight: 400;
  font-size: 1.2rem; line-height: 1.45; color: var(--ink); margin: 0;
}

/* SECTION HEADING (overview variant — flex with count + trailing rule) */
.section-heading {
  display: flex; align-items: baseline; gap: 1rem; margin-bottom: 1.5rem;
}
.section-heading h2 {
  font-family: var(--font-display); font-size: 1.55rem; font-weight: 600;
  letter-spacing: -0.01em; color: var(--ink); margin: 0;
}
.section-heading .count {
  font-family: var(--font-body); font-style: italic;
  font-size: 0.95rem; color: var(--muted);
}
.section-heading .rule { flex: 1; height: 1px; background: var(--rule); align-self: center; }

/* LESSON INDEX ROWS */
.lessons { display: flex; flex-direction: column; gap: 0; }
.lesson {
  display: grid; grid-template-columns: 88px 1fr 28px;
  align-items: center; gap: 1.5rem;
  padding: 1.35rem 0.5rem 1.35rem 0;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none; color: inherit; position: relative;
  transition: background 0.18s ease, padding 0.18s ease;
}
.lesson:hover, .lesson:focus-visible {
  background: linear-gradient(90deg, var(--paper-deep) 0%, transparent 88%);
  padding-left: 0.75rem; outline: none;
}
.lesson:hover .lesson-arrow, .lesson:focus-visible .lesson-arrow {
  color: var(--accent); transform: translateX(4px);
}
.lesson:hover .lesson-title, .lesson:focus-visible .lesson-title { color: var(--accent); }

.lesson-num {
  font-family: var(--font-display); font-weight: 600; font-size: 1.85rem;
  line-height: 1; color: var(--accent); letter-spacing: -0.02em;
  text-align: right; font-feature-settings: "lnum";
}
.lesson-body { min-width: 0; }
.lesson-title {
  font-family: var(--font-display); font-weight: 600; font-size: 1.18rem;
  line-height: 1.32; color: var(--ink); letter-spacing: -0.005em;
  transition: color 0.18s ease;
}
.lesson-title em { font-style: italic; font-weight: 400; }
.lesson-arrow {
  font-family: var(--font-body); font-size: 1.6rem; color: var(--muted);
  text-align: right; line-height: 1;
  transition: color 0.18s ease, transform 0.18s ease;
}

/* Sub-lesson — indented under its parent */
.lesson.sub {
  padding: 0.85rem 0.5rem 0.85rem 1.5rem;
  background: linear-gradient(90deg, color-mix(in srgb, var(--paper-deep) 55%, transparent) 0%, transparent 70%);
  border-bottom-style: dashed; border-bottom-color: var(--rule-soft);
}
.lesson.sub:hover { padding-left: 1.75rem; }
.lesson.sub .lesson-num { font-size: 1.25rem; color: var(--accent-soft); font-style: italic; }
.lesson.sub .lesson-title { font-size: 1.02rem; color: var(--ink-soft); font-style: italic; }
.lesson.sub .lesson-num::before {
  content: "\21B3 "; color: var(--rule); font-style: normal; margin-right: 0.15em;
}

/* Capstone (essay) */
.lesson.capstone {
  margin-top: 0.5rem;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 4%, transparent) 0%, transparent 80%);
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.lesson.capstone .lesson-num { position: relative; }
.lesson.capstone .lesson-num::after {
  content: attr(data-tag); position: absolute; top: -0.85rem; right: 0;
  font-family: var(--font-body); font-size: 0.62rem; letter-spacing: 0.18em;
  font-weight: 600; color: var(--accent); background: var(--paper); padding: 0 0.4em;
}

/* FOOTER ORNAMENT + SIGNATURE */
.ornament {
  text-align: center; margin: 3rem 0 1.5rem;
  font-family: var(--font-display); color: var(--accent-soft);
  font-size: 1rem; letter-spacing: 0.5em; opacity: 0.6;
}
.signature {
  text-align: center; font-family: var(--font-body);
  font-size: 0.85rem; line-height: 1.55; color: var(--muted);
}
.signature .name {
  font-family: var(--font-display); font-weight: 500; font-style: italic;
  font-size: 0.95rem; color: var(--ink-soft); margin: 0 0 0.15rem;
}
.signature p { margin: 0; }

/* RESPONSIVE */
@media (max-width: 640px) {
  body { padding: 1.75rem 1rem 2rem; font-size: 17px; }
  .hero {
    grid-template-columns: 1fr; gap: 1.5rem;
    padding-bottom: 2rem; margin-bottom: 2rem;
  }
  .portrait-wrap { max-width: 240px; margin: 0 auto; }
  .portrait-caption { text-align: center; }
  .unit-title { font-size: 2.5rem; }
  .lesson { grid-template-columns: 68px 1fr 22px; gap: 1rem; padding: 1.1rem 0.25rem; }
  .lesson-num { font-size: 1.5rem; }
  .lesson-title { font-size: 1.05rem; }
  .lesson.sub { padding-left: 1rem; }
  .lesson.sub:hover { padding-left: 1.25rem; }
}

/* PRINT */
@media print {
  body { background: white; padding: 0.5in; }
  .lesson { break-inside: avoid; }
  .lesson:hover { background: none; padding-left: 0; }
}