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

:root {
  --bg:      #0a0d14;
  --ink:     #f4f3ee;
  --mid:     #7880a0;
  --soft:    #3a3f52;
  --border:  #1a1f2e;
  --accent:  #c8bfa8;
  --font-display: "Inter Tight", "Inter", sans-serif;
  --font-body:    "Inter", sans-serif;
  --font-mono:    "JetBrains Mono", monospace;
  --ease-out:     cubic-bezier(.22, 1, .36, 1);
  --ease-io:      cubic-bezier(.65, 0, .35, 1);
  --topbar-h:     60px;
  --bottom-h:     120px;
  --tab-w:        82px;
  --tab-hover-w:  130px;
  --dur:          650ms;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

/* subtle grid bg */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: .45;
  pointer-events: none;
  z-index: 0;
}

/* ── Topbar ──────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
  border-bottom: 1px solid var(--border);
  background: rgba(10,13,20,.9);
  backdrop-filter: blur(16px);
  z-index: 200;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  transition: opacity 200ms;
}
.brand:hover { opacity: .75; }
.brand-mark {
  flex-shrink: 0;
  width: 26px; height: 26px;
  background: url('./assets/mark.png') no-repeat center / contain;
}
.brand small {
  font-weight: 300;
  font-size: 10px;
  letter-spacing: .4em;
  opacity: .7;
}

.topbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.project-eyebrow {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--accent);
}
.project-name {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.topbar-year {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--soft);
  letter-spacing: .1em;
}

/* ── Accordion wrap ──────────────────────────── */
.accordion-wrap {
  position: fixed;
  top: var(--topbar-h);
  left: 0; right: 0;
  height: calc(100vh - var(--topbar-h) - var(--bottom-h));
  z-index: 1;
}

.accordion {
  display: flex;
  height: 100%;
  width: 100%;
}

/* ── Panel ───────────────────────────────────── */
.panel {
  flex: 0 0 var(--tab-w);
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--border);
  transition:
    flex var(--dur) var(--ease-out),
    border-color 300ms;
  cursor: pointer;
  background-color: var(--bg);
  background-size: cover;
  background-position: center;
}
.panel:last-child { border-right: none; }
.panel:not(.active):hover {
  flex: 0 0 var(--tab-hover-w);
}
.panel.active {
  flex: 1;
  cursor: default;
}

/* dark overlay for cover images */
.panel-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg);
  opacity: .55;
  transition: opacity var(--dur) var(--ease-out);
  pointer-events: none;
  z-index: 0;
}
.panel.active .panel-overlay { opacity: 1; }
.panel:not(.has-cover) .panel-overlay { opacity: 0; }

/* accent gradient line at top */
.panel::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease-out);
  z-index: 10;
}
.panel.active::after {
  transform: scaleX(1);
  transition-delay: 120ms;
}

/* ── Panel tab (collapsed label) ─────────────── */
.panel-tab {
  position: absolute;
  top: 0; left: 0;
  width: var(--tab-w);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  background: none;
  border: none;
  color: var(--mid);
  cursor: pointer;
  z-index: 2;
  padding: 32px 0;
  transition: color 250ms, opacity 300ms;
  overflow: hidden;
}
.panel.active .panel-tab {
  opacity: 0;
  pointer-events: none;
}
.panel:not(.active):hover .panel-tab { color: var(--ink); }

/* large watermark number */
.tab-watermark {
  position: absolute;
  bottom: -16px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 130px;
  font-weight: 800;
  letter-spacing: -0.06em;
  color: var(--ink);
  opacity: .13;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  transition: opacity 350ms var(--ease-out), transform 350ms var(--ease-out);
  white-space: nowrap;
}
.panel:not(.active):hover .tab-watermark {
  opacity: .28;
  transform: translateX(-50%) scale(1.06);
}

.tab-num {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .22em;
  color: var(--accent);
  opacity: .8;
  position: relative;
  z-index: 1;
}
.tab-label {
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  white-space: nowrap;
  position: relative;
  z-index: 1;
  transition: font-size 350ms var(--ease-out), letter-spacing 350ms var(--ease-out), font-weight 350ms var(--ease-out);
}
.panel:not(.active):hover .tab-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
}
.tab-arrow {
  font-size: 11px;
  transition: transform 280ms var(--ease-out), opacity 280ms;
  position: relative;
  z-index: 1;
}
.panel:not(.active):hover .tab-arrow {
  transform: translateX(4px);
  opacity: 1;
}

/* ── Panel content ───────────────────────────── */
.panel-content {
  position: absolute;
  top: 0;
  left: var(--tab-w);
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  padding: 30px 36px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 320ms var(--ease-out);
  overflow: hidden;
  z-index: 2;
}
.panel.active .panel-content {
  opacity: 1;
  pointer-events: auto;
  transition-delay: 200ms;
}

.panel-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 20px;
  position: relative;
  flex-shrink: 0;
}
/* gradient separator instead of plain border */
.panel-head::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    var(--accent) 0%,
    var(--border) 40%,
    transparent 100%
  );
}
.head-num {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .22em;
  color: var(--accent);
}
.head-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* ── Viewer toolbar ──────────────────────────── */
.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-shrink: 0;
}
.zoom-btn {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  color: var(--mid);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 200ms, color 200ms;
}
.zoom-btn:hover { border-color: var(--accent); color: var(--ink); }
.zoom-btn:disabled { opacity: .25; pointer-events: none; }
.zoom-level {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .18em;
  color: var(--soft);
  min-width: 36px;
  text-align: center;
}

/* ── PDF viewer ──────────────────────────────── */
.pdf-viewer {
  flex: 1;
  overflow: auto;
  min-height: 0;
  padding-right: 6px;
}
.pdf-viewer::-webkit-scrollbar { width: 2px; }
.pdf-viewer::-webkit-scrollbar-track { background: transparent; }
.pdf-viewer::-webkit-scrollbar-thumb { background: var(--soft); border-radius: 2px; }

/* loading state */
.pdf-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 60px 0;
  color: var(--mid);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
}
.pdf-state.hidden { display: none; }

.pdf-spinner {
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 750ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* pages */
.pdf-pages { display: none; margin: 0 auto; }
.pdf-pages canvas {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 10px;
  border: 1px solid var(--border);
}

/* empty state — just text, animated */
.pdf-empty {
  display: none;
  padding: 48px 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--soft);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Preview image ───────────────────────────── */
.preview-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  margin: 0 auto;
}

/* ── Site fullscreen ─────────────────────────── */
.site-overlay {
  position: fixed;
  inset: 0;
  z-index: 600;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  animation: fadeUp 300ms var(--ease-out) both;
}
.site-overlay-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 44px;
  padding: 0 20px;
  background: rgba(10,13,20,.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 601;
}
.site-overlay-back {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: 1px solid var(--border);
  color: var(--mid);
  cursor: pointer;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .18em;
  text-transform: uppercase;
  transition: border-color 200ms, color 200ms;
}
.site-overlay-back:hover { border-color: var(--accent); color: var(--ink); }
.site-overlay-url {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--soft);
  letter-spacing: .08em;
  pointer-events: none;
}
.site-overlay-disclaimer {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 3px 10px;
  opacity: .7;
  white-space: nowrap;
}
.site-overlay-hint {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--soft);
  letter-spacing: .14em;
  border: 1px solid var(--border);
  padding: 3px 8px;
  opacity: .5;
}
.site-overlay-iframe {
  flex: 1;
  width: 100%;
  border: none;
  display: block;
  min-height: 0;
}

/* ── Fullscreen overlay ──────────────────────── */
.fs-btn { margin-left: auto; }

.viewer-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(10,13,20,.97);
  backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  padding: 28px 36px;
  gap: 14px;
  animation: fadeUp 250ms var(--ease-out) both;
}
.overlay-header {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.overlay-header .viewer-toolbar { flex: 1; margin-bottom: 0; }
.overlay-close {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  color: var(--mid);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 200ms, color 200ms;
}
.overlay-close:hover { border-color: var(--accent); color: var(--ink); }
.viewer-overlay .pdf-viewer {
  flex: 1;
  min-height: 0;
  padding-right: 6px;
}

/* ── Site panel ──────────────────────────────── */
.site-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 32px;
  max-width: 500px;
}

.site-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mid);
}

.site-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.site-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .18em;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1px solid var(--border);
  color: var(--soft);
}

.site-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  padding: 14px 30px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  text-decoration: none;
  transition: opacity 200ms, gap 250ms var(--ease-out);
}
.site-cta:hover { opacity: .82; gap: 14px; }
.site-cta.soon { opacity: .3; pointer-events: none; }

/* ── Bottom bar ──────────────────────────────── */
.bottombar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--bottom-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
  border-top: 1px solid var(--border);
  background: rgba(10,13,20,.92);
  backdrop-filter: blur(16px);
  z-index: 200;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mid);
  text-decoration: none;
  transition: color 200ms, gap 250ms var(--ease-out);
}
.back-btn:hover { color: var(--ink); gap: 16px; }

.bottom-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--soft);
  display: flex;
  gap: 10px;
  align-items: center;
}
.bottom-sep { opacity: .35; }

/* ── Page load animations ────────────────────── */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.topbar       { animation: slideDown 500ms var(--ease-out) both; }
.accordion-wrap { animation: fadeUp 550ms 60ms var(--ease-out) both; }
.bottombar    { animation: slideUp 500ms 100ms var(--ease-out) both; }

/* ── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --tab-w:    44px;
    --bottom-h: 80px;
  }
  .topbar-center { display: none; }
  .accordion { flex-direction: column; }
  .panel {
    flex: 0 0 var(--tab-w);
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .panel.active { flex: 1; }
  .panel::after {
    top: auto; bottom: 0;
    height: auto; width: 2px;
    right: auto;
    background: linear-gradient(0deg, var(--accent), transparent);
    transform: scaleY(0);
    transform-origin: bottom;
  }
  .panel.active::after { transform: scaleY(1); }
  .panel-tab {
    width: 100%;
    height: var(--tab-w);
    flex-direction: row;
    justify-content: flex-start;
    padding: 0 18px;
    gap: 14px;
  }
  .tab-label {
    writing-mode: horizontal-tb;
    transform: none;
  }
  .tab-watermark {
    font-size: 80px;
    bottom: -8px;
    left: auto;
    right: -8px;
    transform: none;
  }
  .tab-arrow { margin-left: auto; }
  .panel-content { top: var(--tab-w); left: 0; padding: 20px 18px; }
}