/* ============================================================
   portfolio-ink.css — "Ink on rice paper" aesthetic for Sharpen.
   Cream rice-paper background, deep ink black + Chinese seal red.
   ============================================================ */

.page-ink {
  --paper: #efe6d2;
  --paper-2: #e6dcc4;
  --ink: #14110b;
  --ink-2: #4a4030;
  --ink-3: #7a6c50;
  --rule: #c8bca0;
  --seal: #a8231a;
  --seal-soft: rgba(168, 35, 26, 0.08);

  --serif: "New York", "Source Serif 4", Georgia, "Times New Roman", ui-serif, serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --hand: "New York", Georgia, serif;

  min-height: 100vh;
  background: var(--paper);
  /* Rice-paper grain */
  background-image:
    radial-gradient(rgba(120, 100, 60, 0.05) 1px, transparent 1.5px),
    radial-gradient(rgba(120, 100, 60, 0.04) 1px, transparent 1.5px);
  background-size: 22px 22px, 7px 7px;
  background-position: 0 0, 3px 3px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page-ink, .page-ink * { box-sizing: border-box; }
.page-ink a { color: inherit; text-decoration: none; }

/* ---------- Top bar ---------- */
.ink-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(20px, 5vw, 56px);
  background: rgba(239, 230, 210, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.ink-topbar-home { color: var(--ink); font-weight: 500; }
.ink-topbar-home:hover { color: var(--seal); }
.ink-topbar-meta { justify-self: center; color: var(--ink-3); }
.ink-topbar-back:hover { color: var(--seal); }

/* ---------- Cover ---------- */
.ink-cover {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(64px, 12vw, 144px) clamp(24px, 6vw, 80px) clamp(48px, 6vw, 80px);
  position: relative;
}

.ink-seal {
  position: absolute;
  top: clamp(48px, 10vw, 96px);
  right: clamp(24px, 6vw, 80px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transform: rotate(-3deg);
}

.ink-seal > span:first-child {
  font-family: var(--serif);
  font-size: 88px;
  line-height: 1;
  color: var(--paper);
  background: var(--seal);
  padding: 14px 18px;
  border-radius: 8px;
  font-weight: 500;
  letter-spacing: 0;
  box-shadow: 0 4px 12px rgba(168, 35, 26, 0.25);
}

.ink-seal-romaji {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--seal);
}

.ink-cover-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--seal);
  margin: 0 0 32px;
}

.ink-cover-title {
  font-family: var(--serif);
  font-size: clamp(2.75rem, 8vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin: 0 0 40px;
  font-weight: 500;
  max-width: 16ch;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ink-cover-tail {
  font-style: italic;
  font-size: 0.45em;
  color: var(--ink-2);
  line-height: 1.4;
  letter-spacing: -0.015em;
  max-width: 30ch;
}

.ink-cover-rule {
  height: 2px;
  width: 80px;
  background: var(--seal);
  margin-bottom: 24px;
}

.ink-cover-meta {
  display: flex;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- Strokes (metrics) ---------- */
.ink-strokes {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px clamp(24px, 6vw, 80px) 64px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.ink-stroke {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 24px;
}

.ink-stroke-num {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-3);
}

.ink-stroke-value {
  font-family: var(--serif);
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: -0.015em;
  color: var(--seal);
  font-weight: 500;
}

.ink-stroke-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 4px;
}

/* ---------- Scroll (story) ---------- */
.ink-scroll {
  max-width: 880px;
  margin: 0 auto;
  padding: clamp(48px, 8vw, 96px) clamp(24px, 6vw, 80px);
}

.ink-leaf {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: clamp(20px, 4vw, 56px);
  padding: 48px 0;
  border-bottom: 1px dashed var(--rule);
}

.ink-leaf:last-child { border-bottom: none; }

.ink-leaf-mark {
  font-family: var(--serif);
  font-size: 56px;
  line-height: 1;
  color: var(--seal);
  font-weight: 500;
  opacity: 0.45;
  align-self: start;
  padding-top: 6px;
}

.ink-leaf-body { max-width: 60ch; }

.ink-leaf-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--seal);
  display: block;
  margin-bottom: 16px;
}

.ink-leaf-heading {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 24px;
  max-width: 24ch;
}

.ink-leaf-para {
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0 0 16px;
}

.ink-leaf-para:last-child { margin-bottom: 0; }

/* ---------- Coda ---------- */
.ink-coda {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(64px, 10vw, 120px) clamp(24px, 6vw, 80px);
  text-align: center;
}

.ink-coda-mark {
  font-family: var(--serif);
  font-size: 64px;
  line-height: 1;
  color: var(--seal);
  margin-bottom: 24px;
  font-weight: 500;
}

.ink-coda-line {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 32px;
}

.ink-back {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 14px 24px;
  border: 1px solid var(--ink);
  transition: background 200ms ease, color 200ms ease;
}

.ink-back:hover { background: var(--seal); color: var(--paper); border-color: var(--seal); }

/* ---------- Footer ---------- */
.ink-footer {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 32px 24px 48px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-top: 1px solid var(--rule);
}

.ink-footer a:hover { color: var(--seal); }

/* ---------- Forgetting curve ---------- */
.ink-curve {
  max-width: 640px;
  margin: 80px auto 24px;
  padding: 0 24px;
  text-align: center;
}
.ink-curve-cap { display: block; margin-bottom: 18px; }
.ink-curve-cap-eye {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--seal);
}
.ink-curve-cap-sub {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-2);
  margin-top: 4px;
}
.ink-curve-svg {
  width: 100%;
  height: auto;
  display: block;
}
.ink-curve-axes line {
  stroke: var(--rule);
  stroke-width: 1;
}
.ink-curve-axis-label {
  fill: var(--ink-3);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
}
.ink-curve-unreviewed {
  fill: none;
  stroke: var(--ink-2);
  stroke-width: 1.4;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: ink-draw 3.6s ease-out forwards;
}
.ink-curve-unreviewed-fill {
  opacity: 0;
  animation: ink-fade-in 2s ease-out 1s forwards;
}
.ink-curve-reviewed {
  fill: none;
  stroke: var(--seal);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-dasharray: 900;
  stroke-dashoffset: 900;
  animation: ink-draw 4.8s ease-out 0.4s forwards;
}
.ink-curve-marks circle {
  fill: var(--seal);
  opacity: 0;
  animation: ink-fade-in 0.3s ease-out forwards;
}
.ink-curve-marks circle:nth-child(1) { animation-delay: 1.6s; }
.ink-curve-marks circle:nth-child(2) { animation-delay: 2.4s; }
.ink-curve-marks circle:nth-child(3) { animation-delay: 3.2s; }
.ink-curve-marks circle:nth-child(4) { animation-delay: 4s; }
.ink-curve-marks circle:nth-child(5) { animation-delay: 4.8s; }
@keyframes ink-draw { to { stroke-dashoffset: 0; } }
@keyframes ink-fade-in { to { opacity: 1; } }
.ink-curve-legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
}
.ink-curve-legend li { display: flex; align-items: center; gap: 8px; }
.ink-curve-swatch {
  display: inline-block;
  width: 18px;
  height: 2px;
  border-radius: 1px;
}
.ink-curve-swatch--u { background: var(--ink-2); }
.ink-curve-swatch--r { background: var(--seal); }

@media (prefers-reduced-motion: reduce) {
  .ink-curve-unreviewed, .ink-curve-reviewed { stroke-dashoffset: 0; animation: none; }
  .ink-curve-unreviewed-fill, .ink-curve-marks circle { opacity: 1; animation: none; }
}

@media (max-width: 720px) {
  .ink-topbar-meta { display: none; }
  .ink-seal { position: static; transform: none; margin-bottom: 32px; align-self: flex-start; align-items: flex-start; }
  .ink-seal > span:first-child { font-size: 60px; }
  .ink-leaf { grid-template-columns: 1fr; gap: 12px; padding: 32px 0; }
  .ink-leaf-mark { font-size: 36px; padding-top: 0; }
  .ink-curve { margin: 56px auto 16px; }
}