:root {
  --bg:            oklch(0.974 0.011 95);
  --bg-sunken:     oklch(0.958 0.014 95);
  --surface:       oklch(0.962 0.013 95);
  --surface-hover: oklch(0.945 0.016 92);
  --rule:          oklch(0.910 0.012 90);
  --border:        oklch(0.870 0.014 90);
  --border-strong: oklch(0.770 0.012 90);

  --ink:        oklch(0.176 0.001 95);
  --ink-link:   oklch(0.123 0 0);
  --ink-2:      oklch(0.330 0.004 95);
  --ink-3:      oklch(0.520 0.006 95);
  --ink-faint:  oklch(0.680 0.008 95);

  --brand:      oklch(0.620 0.150 30);
  --cta:        var(--ink);
  --cta-hover:  oklch(0.260 0.005 90);
  --on-cta:     var(--bg);
  --ok:         oklch(0.430 0.090 145);

  --font-serif: "Source Serif 4", "Noto Serif SC", Georgia, "Songti SC", "Times New Roman", serif;
  --font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:  "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; font-style: normal; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1, "tnum" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
}

a { color: var(--ink-link); text-decoration: none; transition: color 120ms ease-out; }
a:hover { color: var(--ink); }

h1, h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--ink-link);
  margin: 0;
  letter-spacing: -0.021em;
  font-optical-sizing: auto;
}
h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.02; }
h2 { font-size: 22px; line-height: 1.2; }

p, li { color: var(--ink-2); }
code, kbd, .mono { font-family: var(--font-mono); font-weight: 500; }

.container { max-width: 720px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .container { padding: 0 18px; } }

/* header */
.masthead { border-bottom: 1px solid var(--rule); background: var(--bg); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(6px); }
.masthead .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); font-size: 19px; font-weight: 500; color: var(--ink-link); letter-spacing: -0.01em; }
.brand .dot { width: 8px; height: 8px; border-radius: 999px; background: var(--ok); box-shadow: 0 0 0 3px oklch(0.430 0.090 145 / 0.14); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 500;
  color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--ink-faint); display: inline-block; }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-2);
  padding: 4px 10px; border: 1px solid var(--rule); border-radius: 999px;
  background: var(--bg); letter-spacing: 0.04em;
}
.pill .dot { width: 6px; height: 6px; border-radius: 999px; background: var(--ok); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* hero */
.hero { padding: 56px 0 30px; }
.hero p.lead { color: var(--ink-3); font-size: 15px; margin: 16px 0 0; max-width: 52ch; }

/* buttons */
.cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--cta); color: var(--on-cta); border: 1px solid var(--cta);
  padding: 11px 18px; border-radius: 6px; font-weight: 500; font-size: 13px;
  font-family: var(--font-sans); cursor: pointer;
  transition: background 120ms ease-out, transform 160ms ease-out;
}
.cta:hover { background: var(--cta-hover); color: var(--on-cta); }
.cta:disabled { opacity: 0.5; cursor: not-allowed; }
.cta-ghost {
  display: inline-flex; align-items: center; gap: 8px; background: transparent;
  color: var(--ink); border: 1px solid var(--border); padding: 9px 15px;
  border-radius: 6px; font-weight: 500; font-size: 13px; font-family: var(--font-sans); cursor: pointer;
  transition: background 120ms ease-out, border-color 120ms ease-out;
}
.cta-ghost:hover { background: var(--surface); border-color: var(--ink-faint); }

/* feed list */
.feed { padding: 8px 0 80px; display: flex; flex-direction: column; gap: 0; }
.post {
  padding: 26px 0; border-top: 1px solid var(--rule); position: relative;
  animation: rise 0.5s cubic-bezier(0.2,0.7,0.2,1) both;
}
.post.flash { background: linear-gradient(90deg, oklch(0.430 0.090 145 / 0.10), transparent); border-radius: 8px; padding-left: 14px; padding-right: 14px; margin: 0 -14px; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } }
.post-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.post-time { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); letter-spacing: 0.02em; }
.post-tag {
  font-family: var(--font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--ink-2); border: 1px solid var(--border); border-radius: 4px; padding: 2px 8px; background: var(--surface);
}
.post h2 { margin: 0 0 6px; }
.post-body { color: var(--ink-2); font-size: 15px; line-height: 1.65; white-space: pre-wrap; word-break: break-word; }
.post-body a { text-decoration: underline; text-underline-offset: 3px; }

.empty { padding: 60px 0; text-align: center; color: var(--ink-faint); font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; }

.new-banner {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 28px; z-index: 40;
  background: var(--ink); color: var(--bg); border-radius: 999px; padding: 9px 18px;
  font-size: 12.5px; font-weight: 500; cursor: pointer; box-shadow: 0 8px 24px oklch(0 0 0 / 0.16);
  display: none; align-items: center; gap: 8px;
}
.new-banner.show { display: inline-flex; animation: rise 0.35s ease-out; }

/* forms (admin) */
.card { border: 1px solid var(--rule); border-radius: 14px; background: var(--bg); padding: 26px; }
label { display: block; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); margin: 0 0 7px; }
input[type=text], input[type=password], textarea {
  width: 100%; font-family: var(--font-sans); font-size: 14px; color: var(--ink);
  background: var(--bg-sunken); border: 1px solid var(--border); border-radius: 8px;
  padding: 11px 13px; outline: none; transition: border-color 120ms ease-out;
}
input:focus, textarea:focus { border-color: var(--border-strong); }
textarea { resize: vertical; min-height: 130px; line-height: 1.6; }
.field { margin-bottom: 18px; }
.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.msg { font-family: var(--font-mono); font-size: 12px; margin-top: 12px; }
.msg.ok { color: var(--ok); }
.msg.err { color: var(--brand); }
.hint { color: var(--ink-faint); font-size: 12px; margin-top: 6px; }
.footer { border-top: 1px solid var(--rule); padding: 22px 0; color: var(--ink-faint); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; }
.admin-post { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 0; border-top: 1px solid var(--rule); }
.admin-post .txt { min-width: 0; }
.admin-post .txt .t { color: var(--ink); font-weight: 500; }
.admin-post .txt .b { color: var(--ink-3); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 46ch; }
.del { color: var(--brand); border: 1px solid var(--border); background: transparent; border-radius: 6px; padding: 6px 11px; font-size: 12px; cursor: pointer; font-family: var(--font-mono); }
.del:hover { border-color: var(--brand); }