/* ========================================================================
   chapter.css — shared layout for all chapter pages
   Extends styles.css; include after it on each chapter page.
   ======================================================================== */

/* ---- Page entry animation ---- */

@keyframes ch-fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.ch-main {
  animation: ch-fade-up 0.4s cubic-bezier(.2, .6, .2, 1) both;
  animation-delay: 0.05s;
}

@media (prefers-reduced-motion: reduce) {
  .ch-main { animation: none; }
}

/* ---- Sticky header ---- */

.ch-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(9, 9, 11, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.ch-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.ch-back {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 160ms ease;
}

.ch-back:hover { color: var(--accent); }

.ch-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.ch-label .br { color: var(--muted-2); }

/* ---- Main content area ---- */

.ch-main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(48px, 7vw, 80px) var(--gutter);
}

/* ---- Page title ---- */

.ch-title {
  font-family: var(--font-sans);
  font-size: clamp(52px, 9vw, 100px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 0.9;
  color: var(--fg);
  margin-bottom: clamp(40px, 5vw, 64px);
}

/* ---- Section pattern ---- */

.ch-section {
  padding: clamp(40px, 5vw, 60px) 0;
  border-top: 1px solid var(--border);
}

.ch-section:first-of-type { border-top: none; padding-top: 0; }

.ch-section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 28px;
}

.ch-section-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  flex-shrink: 0;
}
.ch-section-num .br { color: var(--muted); }

.ch-section-title {
  font-family: var(--font-sans);
  font-size: clamp(12px, 1vw, 14px);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---- Footer ---- */

.ch-footer {
  border-top: 1px solid var(--border);
}

.ch-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--gutter) 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.ch-footer-inner b { color: var(--fg-dim); font-weight: 500; }
.ch-footer-inner a { color: var(--muted); transition: color 160ms ease; }
.ch-footer-inner a:hover { color: var(--accent); }

/* ========================================================================
   About
   ======================================================================== */

.about-lead {
  font-size: clamp(17px, 1.5vw, 21px);
  color: var(--fg-dim);
  max-width: 54ch;
  line-height: 1.65;
}

.about-lead em {
  color: var(--accent);
  font-style: normal;
}

.about-lead p + p { margin-top: 1.4em; }

/* ========================================================================
   Photography — grid + lightbox
   ======================================================================== */

.photo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.photo-grid-item {
  display: block;
  aspect-ratio: 3 / 2;
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: zoom-in;
}

.photo-grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 500ms cubic-bezier(.2, .6, .2, 1);
}

.photo-grid-item:hover img { transform: scale(1.04); }

/* Lightbox — z-index 200 so it sits above the panel overlay */

.photo-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.photo-lightbox:target { display: flex; }

.photo-lightbox-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.94);
  cursor: zoom-out;
  display: block;
}

.photo-lightbox img {
  position: relative;
  z-index: 1;
  max-width: 90vw;
  max-height: 88vh;
  object-fit: contain;
  display: block;
}

.photo-lightbox-close {
  position: fixed;
  top: 20px;
  right: 24px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 160ms ease;
}

.photo-lightbox-close:hover { color: var(--accent); }

/* ========================================================================
   Professional — resume
   ======================================================================== */

.resume-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 11px 20px;
  margin-bottom: 52px;
  transition: background 160ms ease, color 160ms ease;
}

.resume-cta:hover {
  background: var(--accent);
  color: var(--fg);
}

.work-entries { display: flex; flex-direction: column; }

.work-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.work-entry:first-child { border-top: 1px solid var(--border); }

.work-period {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  line-height: 1.5;
  padding-top: 2px;
}

.work-role {
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.2vw, 17px);
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 3px;
  line-height: 1.2;
}

.work-company {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  color: var(--accent);
  margin-bottom: 10px;
}

.work-desc {
  font-size: 14px;
  color: var(--fg-dim);
  line-height: 1.65;
}

@media (max-width: 560px) {
  .work-entry { grid-template-columns: 1fr; gap: 6px; }
}

/* ========================================================================
   Side Projects
   ======================================================================== */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--bg);
  border: 1px solid var(--border);
}

.project-card {
  background: var(--bg);
  padding: clamp(22px, 3vw, 32px);
  transition: background 200ms ease;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  display: block;
  color: inherit;
}

.project-card:hover { background: var(--surface); }

.project-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 320ms cubic-bezier(.2, .6, .2, 1);
}

.project-card:hover::before { transform: scaleX(1); }

.project-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 14px;
}

.project-name {
  font-family: var(--font-sans);
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 10px;
  line-height: 1.2;
}

.project-desc {
  font-size: 14px;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* ========================================================================
   Overlay panels — triggered by hash, closed by href="#" or backdrop click
   ======================================================================== */

.ch-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
}

.ch-overlay:target {
  display: flex;
  align-items: center;
  justify-content: center;
}

.ch-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(5, 5, 7, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: default;
  display: block;
}

.ch-overlay:target .ch-backdrop {
  animation: ch-backdrop-in 0.28s ease both;
}

.ch-panel {
  position: relative;
  width: min(900px, calc(100% - 2 * var(--gutter)));
  height: 88vh;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 1;
}

.ch-overlay:target .ch-panel {
  animation: ch-panel-in 0.32s cubic-bezier(.16, 1, .3, 1) both;
}

@keyframes ch-backdrop-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes ch-panel-in {
  from { opacity: 0; transform: translateY(16px) scale(0.99); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .ch-overlay:target .ch-backdrop,
  .ch-overlay:target .ch-panel { animation: none; }
}

.ch-panel-header {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 32px;
  border-bottom: 1px solid var(--border);
}

.ch-panel-close {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 160ms ease;
}

.ch-panel-close:hover { color: var(--accent); }

.ch-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: clamp(32px, 5vw, 48px) 32px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.ch-panel-body .ch-title {
  font-size: clamp(36px, 6vw, 64px);
}