/* Phasera Cases — editorial style, tone-matched to the phasera.jp LP
   (cool navy/blue palette + Manrope / Inter Tight / Instrument Serif). */
:root {
  --bg:        #F2F5FA;
  --bg-2:      #E7EDF6;
  --ink:       #0B1E3F;
  --ink-2:     #1E3358;
  --ink-soft:  #4D6488;
  --line:      rgba(11, 30, 63, 0.12);
  --line-soft: rgba(11, 30, 63, 0.06);
  --paper:     #ffffff;
  --blue:      oklch(0.62 0.18 250);
  --blue-2:    oklch(0.72 0.14 235);
  --blue-soft: oklch(0.92 0.05 240);
  --tint:      oklch(0.62 0.18 250 / 0.08);
  --tint-2:    oklch(0.62 0.18 250 / 0.05);
  --grad:      linear-gradient(180deg, #F2F5FA 0%, #E9EFF8 50%, #F2F5FA 100%);
  --code-bg:   #0B1E3F;
  --code-fg:   #d6e7f7;
  --display: "Manrope", "Inter Tight", "Noto Sans JP", system-ui, sans-serif;
  --body:    "Inter Tight", "Noto Sans JP", system-ui, sans-serif;
  --jp:      "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --serif:   "Instrument Serif", "EB Garamond", "Noto Serif JP", Georgia, serif;
  --mono:    "JetBrains Mono", ui-monospace, Menlo, monospace;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background:
    radial-gradient(60% 50% at 12% 0%, oklch(0.62 0.18 250 / 0.06), transparent 60%),
    radial-gradient(55% 45% at 92% 100%, oklch(0.72 0.14 235 / 0.05), transparent 60%),
    var(--grad);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--body);
  font-feature-settings: "palt" 1;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============== Nav ============== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: linear-gradient(180deg, rgba(242, 245, 250, 0.82), rgba(242, 245, 250, 0.55));
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav .inner {
  max-width: 920px; margin: 0 auto;
  padding: 16px 28px;
  display: flex; align-items: center; gap: 16px;
}
.brand {
  font-family: var(--display);
  font-weight: 800; font-size: 18px; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; gap: 9px;
}
.brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue) 0%, var(--ink) 100%);
}
.brand-sub {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em;
  font-weight: 500; text-transform: uppercase; color: var(--blue);
  margin-left: 4px;
}
.crumbs {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em;
  color: var(--ink-soft); text-transform: uppercase;
  display: inline-flex; gap: 8px; align-items: center;
}
.crumbs a { color: inherit; text-decoration: none; }
.crumbs a:hover { color: var(--blue); }
.crumbs .sep { opacity: 0.5; }
.spacer { flex: 1; }
.home {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em;
  color: var(--blue); text-decoration: none; text-transform: uppercase;
  border: 1px solid var(--line); padding: 8px 14px; border-radius: 999px;
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}
.home:hover { background: var(--tint-2); border-color: var(--blue); }

/* ============== Article ============== */
.article {
  max-width: 740px;
  margin: 56px auto 96px;
  padding: 0 28px;
}
.article-head {
  margin-bottom: 56px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.22em;
  color: var(--blue); text-transform: uppercase;
  margin-bottom: 18px;
}
.article-head h1 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(28px, 4vw, 40px); letter-spacing: -0.025em;
  line-height: 1.25; margin: 0 0 18px;
  color: var(--ink);
}
.article-head h1 em {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  color: var(--blue); letter-spacing: -0.01em;
}
.article-head .meta {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em;
  color: var(--ink-soft); text-transform: uppercase;
}
.article-head .meta .sep { opacity: 0.4; padding: 0 8px; }
.article-head .meta .status {
  color: var(--blue); border: 1px solid var(--line);
  padding: 2px 8px; border-radius: 4px;
}

/* Article body */
.article-body { font-size: 15px; color: var(--ink-2); }
.article-body h2 {
  font-family: var(--display); font-weight: 700;
  font-size: 22px; letter-spacing: -0.015em;
  margin: 56px 0 18px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
  color: var(--ink);
}
.article-body h2:first-child { padding-top: 0; border-top: 0; margin-top: 0; }
.article-body h3 {
  font-family: var(--display); font-weight: 600;
  font-size: 17px; letter-spacing: -0.01em;
  margin: 36px 0 12px; color: var(--ink);
}
.article-body p { margin: 0 0 22px; color: var(--ink-2); }
.article-body em {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  color: var(--blue);
}
.article-body strong { font-weight: 700; color: var(--ink); }
.article-body ul, .article-body ol { padding-left: 1.5em; margin: 0 0 22px; color: var(--ink-2); }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  margin: 24px 0;
  padding: 14px 18px;
  background: var(--tint-2);
  border-left: 3px solid var(--blue);
  color: var(--ink-2);
  font-size: 14px;
}
.article-body a {
  color: var(--blue); text-decoration: underline; text-underline-offset: 3px;
  text-decoration-color: oklch(0.62 0.18 250 / 0.4);
}
.article-body a:hover { text-decoration-color: var(--blue); }
.article-body hr { border: 0; border-top: 1px dashed var(--line); margin: 32px 0; }

/* Code */
.article-body code {
  font-family: var(--mono); font-size: 12.5px;
  background: var(--tint);
  color: var(--ink);
  padding: 2px 6px; border-radius: 4px;
}
.article-body pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 18px 22px;
  border-radius: 10px;
  overflow-x: auto;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.7;
  letter-spacing: 0.01em;
  margin: 24px 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 50px -20px rgba(11, 30, 63, 0.35);
}
.article-body pre code {
  background: transparent; color: inherit; padding: 0; border-radius: 0;
  font-size: inherit;
}

/* Table */
.article-body table {
  border-collapse: collapse;
  width: 100%; margin: 24px 0;
  font-size: 13.5px;
}
.article-body th, .article-body td {
  border: 1px solid var(--line);
  padding: 10px 14px;
  text-align: left;
}
.article-body th {
  background: var(--tint);
  font-weight: 600; color: var(--ink);
}

/* Article footer */
.article-foot {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-soft);
}
.article-foot p { margin: 0 0 12px; }
.article-foot a { color: var(--blue); }
.article-foot .cta a { font-weight: 600; }

/* ============== Landing (hub) ============== */
.landing {
  max-width: 820px; margin: 56px auto 96px;
  padding: 0 28px;
}
.landing-head {
  margin-bottom: 56px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.landing-head h1 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(32px, 5vw, 48px); letter-spacing: -0.025em;
  line-height: 1.2; margin: 14px 0 18px;
  color: var(--ink);
}
.landing-head h1 em {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  color: var(--blue); letter-spacing: -0.01em;
}
.landing-head p {
  font-size: 15px; line-height: 1.85; color: var(--ink-2);
  max-width: 640px; margin: 0;
}

.entries { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.entry a {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 22px 24px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-decoration: none; color: var(--ink);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease),
              background 200ms var(--ease), box-shadow 200ms var(--ease);
}
.entry a:hover {
  transform: translateY(-2px);
  background: var(--paper);
  border-color: var(--blue);
  box-shadow: 0 24px 50px -28px rgba(11, 30, 63, 0.28);
}
.entry-main { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.entry .t {
  font-family: var(--display); font-weight: 600;
  font-size: 17px; letter-spacing: -0.01em;
}
.entry .desc {
  font-family: var(--jp); font-weight: 400;
  font-size: 13px; line-height: 1.7; letter-spacing: 0;
  color: var(--ink-2); text-transform: none;
}
.entry .meta {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em;
  color: var(--ink-soft); text-transform: uppercase;
  white-space: nowrap; flex-shrink: 0;
}

.cta-block {
  margin-top: 64px; padding: 32px;
  border-radius: 18px;
  background: var(--tint-2);
  border: 1px solid var(--line);
}
.cta-block h2 {
  margin: 0 0 10px;
  font-family: var(--display); font-size: 19px; font-weight: 700;
  color: var(--ink); letter-spacing: -0.01em;
}
.cta-block p { margin: 0; font-size: 14px; color: var(--ink-2); }
.cta-block a { color: var(--blue); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

/* ============== Site footer ============== */
.site-foot {
  text-align: center;
  padding: 32px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.18em;
  color: var(--ink-soft); text-transform: uppercase;
  border-top: 1px solid var(--line);
}
.site-foot a { color: var(--blue); text-decoration: none; }
.site-foot .sep { opacity: 0.4; padding: 0 10px; }

/* Mobile */
@media (max-width: 640px) {
  .nav .inner { padding: 12px 20px; }
  .crumbs { display: none; }
  .article, .landing { padding: 0 20px; margin: 40px auto 64px; }
  .article-head h1 { font-size: 26px; }
  .article-body pre { font-size: 11.5px; padding: 14px 16px; }
  .article-body table { font-size: 12px; }
  .article-body th, .article-body td { padding: 8px 10px; }
  .entry a { flex-direction: column; align-items: stretch; gap: 10px; }
  .entry .meta { white-space: normal; }
}