/* ===== K-PROBOT changelog — editorial / Material You（脱・AIっぽさ） ===== */

:root {
  --primary: #38608f;
  --on-primary: #ffffff;
  --primary-container: #d3e4ff;
  --on-primary-container: #16324f;
  --surface: #fbfcff;
  --surface-container-low: #f3f4fa;
  --surface-container: #edeef4;
  --surface-container-high: #e7e8ef;
  --on-surface: #1a1c20;
  --on-surface-variant: #444750;
  --outline: #74777f;
  --outline-variant: #d7d9e2;
  --error: #ba1a1a;

  --mono: "SFMono-Regular", "Cascadia Code", "JetBrains Mono", ui-monospace, Consolas, monospace;
  --sans: "Inter", "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", sans-serif;

  --radius-sm: 10px;
  --radius-md: 14px;
  --wrap: 720px;
  color-scheme: light dark;
}

:root[data-theme="dark"] {
  --primary: #a8c8ff;
  --on-primary: #003060;
  --primary-container: #234876;
  --on-primary-container: #d6e3ff;
  --surface: #101216;
  --surface-container-low: #171a1f;
  --surface-container: #1b1e23;
  --surface-container-high: #24272d;
  --on-surface: #e3e2e6;
  --on-surface-variant: #c4c6cf;
  --outline: #8e9099;
  --outline-variant: #2c2f36;
  --error: #ffb4ab;
}
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    --primary: #a8c8ff; --on-primary: #003060;
    --primary-container: #234876; --on-primary-container: #d6e3ff;
    --surface: #101216; --surface-container-low: #171a1f;
    --surface-container: #1b1e23; --surface-container-high: #24272d;
    --on-surface: #e3e2e6; --on-surface-variant: #c4c6cf;
    --outline: #8e9099; --outline-variant: #2c2f36; --error: #ffb4ab;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--surface); color: var(--on-surface);
  font-family: var(--sans); line-height: 1.65; -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv05", "ss01";
}
a { color: inherit; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding-inline: 1.5rem; }

/* ---- マストヘッド（左寄せ・絵文字なし） ---- */
.masthead {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.3) blur(10px);
  border-bottom: 1px solid var(--outline-variant);
}
.masthead__inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: inline-flex; align-items: baseline; gap: .5rem; text-decoration: none; color: var(--on-surface); }
.brand__name { font-weight: 800; letter-spacing: -.02em; font-size: 1.02rem; }
.brand__slash { color: var(--outline); font-weight: 400; }
.brand__label { font-family: var(--mono); font-size: .82rem; color: var(--on-surface-variant); letter-spacing: -.01em; }
.masthead__nav { display: flex; align-items: center; gap: .35rem; }

.main { padding-top: 3.5rem; padding-bottom: 5rem; min-height: 60vh; }

/* ---- 導入（左寄せ・控えめ） ---- */
.intro { margin-bottom: 3rem; }
.intro__title { font-size: clamp(1.8rem, 3.5vw, 2.3rem); font-weight: 800; letter-spacing: -.03em; margin: 0; }
.intro__sub { color: var(--on-surface-variant); margin: .6rem 0 0; font-size: 1rem; }

/* ---- チェンジログ（タイムライン） ---- */
.changelog { display: flex; flex-direction: column; }
.entry { display: grid; grid-template-columns: 16px 1fr; column-gap: 1.5rem; }
.entry__rail { position: relative; }
.entry__rail::before {
  content: ""; position: absolute; left: 7px; top: 4px; bottom: -.5rem;
  width: 2px; background: var(--outline-variant);
}
.entry:last-child .entry__rail::before { display: none; }
.entry__node {
  position: absolute; left: 0; top: 6px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--primary); box-shadow: 0 0 0 4px var(--surface);
}
.entry__body { padding-bottom: 3rem; min-width: 0; }
.entry__meta { display: flex; align-items: center; gap: .75rem; margin-bottom: .35rem; }
.entry__ver { font-family: var(--mono); font-size: 1.1rem; font-weight: 700; letter-spacing: -.02em; }
.entry__ver::before { content: "v"; color: var(--on-surface-variant); font-weight: 500; }
.entry__date { font-family: var(--mono); font-size: .8rem; color: var(--on-surface-variant); margin-left: auto; font-variant-numeric: tabular-nums; }
.entry__title { font-size: 1.28rem; font-weight: 700; letter-spacing: -.015em; margin: 0 0 .75rem; }

.tag {
  font-family: var(--mono); font-size: .68rem; font-weight: 600; letter-spacing: .02em;
  padding: .12rem .45rem; border-radius: 5px; text-transform: uppercase;
}
.tag--latest { background: var(--primary-container); color: var(--on-primary-container); }

/* ---- prose（Markdown） ---- */
.prose { color: var(--on-surface); }
.prose > *:first-child { margin-top: 0; } .prose > *:last-child { margin-bottom: 0; }
.prose h1, .prose h2, .prose h3 { font-weight: 700; line-height: 1.35; letter-spacing: -.01em; margin: 1.5rem 0 .5rem; }
.prose h1 { font-size: 1.15rem; } .prose h2 { font-size: 1.05rem; } .prose h3 { font-size: .98rem; }
.prose p { margin: .55rem 0; }
.prose ul, .prose ol { margin: .55rem 0; padding-left: 1.3rem; }
.prose li { margin: .28rem 0; }
.prose li::marker { color: var(--outline); }
.prose a { color: var(--primary); text-underline-offset: 2px; }
.prose code { font-family: var(--mono); font-size: .86em; background: var(--surface-container); padding: .1em .4em; border-radius: 5px; }
.prose pre { background: var(--surface-container); border: 1px solid var(--outline-variant); padding: 1rem; border-radius: var(--radius-sm); overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose blockquote { margin: .7rem 0; padding: .2rem 0 .2rem 1rem; border-left: 2px solid var(--primary); color: var(--on-surface-variant); }
.prose hr { border: none; border-top: 1px solid var(--outline-variant); margin: 1.3rem 0; }

/* ---- エンプティ（ターミナル調・左寄せ） ---- */
.empty { max-width: 520px; }
.term {
  font-family: var(--mono); font-size: .88rem; line-height: 1.7; margin: 0 0 1rem;
  background: var(--surface-container-low); border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md); padding: 1rem 1.25rem; overflow-x: auto; white-space: pre;
}
.term__prompt { color: var(--primary); font-weight: 700; user-select: none; }
.term__out { display: block; margin-top: .35rem; color: var(--on-surface-variant); }
.empty__hint { color: var(--on-surface-variant); font-size: .92rem; }
.empty__hint a, .foot a { color: var(--primary); }

/* ---- ボタン / フォーム（管理・ログイン用） ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .4rem; height: 40px; padding: 0 1.3rem; border: none; border-radius: 8px; font: 600 .92rem var(--sans); cursor: pointer; text-decoration: none; transition: background .15s, box-shadow .15s; white-space: nowrap; }
.btn--filled { background: var(--primary); color: var(--on-primary); }
.btn--filled:hover { box-shadow: 0 2px 10px color-mix(in srgb, var(--primary) 35%, transparent); }
.btn--text { background: transparent; color: var(--primary); padding: 0 .8rem; }
.btn--text:hover { background: color-mix(in srgb, var(--primary) 12%, transparent); }
.btn--sm { height: 32px; font-size: .84rem; padding: 0 .75rem; }
.btn--danger { color: var(--error); }
.btn--danger:hover { background: color-mix(in srgb, var(--error) 12%, transparent); }
.icon-btn { width: 38px; height: 38px; border: none; border-radius: 8px; background: transparent; color: var(--on-surface-variant); cursor: pointer; font-size: 1.1rem; display: grid; place-items: center; transition: background .15s; }
.icon-btn:hover { background: color-mix(in srgb, var(--on-surface) 8%, transparent); }
.inline-form { display: inline; margin: 0; }

.card { background: var(--surface-container-low); border: 1px solid var(--outline-variant); border-radius: var(--radius-md); padding: 1.75rem; }
.form { display: flex; flex-direction: column; gap: 1rem; }
.form__row { display: flex; gap: 1rem; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field--sm { width: 140px; } .field--grow { flex: 1; min-width: 180px; }
.field__label { font-family: var(--mono); font-size: .78rem; color: var(--on-surface-variant); }
.field__input { font: inherit; color: var(--on-surface); background: var(--surface); border: 1px solid var(--outline); border-radius: 8px; padding: .65rem .85rem; outline: none; transition: border-color .15s, box-shadow .15s; }
.field__input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent); }
.field__textarea { resize: vertical; min-height: 200px; font-family: var(--mono); font-size: .88rem; line-height: 1.55; }

.switch { display: inline-flex; align-items: center; gap: .55rem; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; }
.switch__track { width: 42px; height: 24px; border-radius: 999px; background: var(--surface-container-high); border: 2px solid var(--outline); position: relative; transition: .18s; }
.switch__track::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 50%; background: var(--outline); transition: .18s; }
.switch input:checked + .switch__track { background: var(--primary); border-color: var(--primary); }
.switch input:checked + .switch__track::after { transform: translateX(18px); background: var(--on-primary); }
.switch__label { font-size: .9rem; }

/* ---- 管理ダッシュボード ---- */
.admin-grid { display: grid; grid-template-columns: minmax(320px, 1fr) minmax(300px, 400px); gap: 1.5rem; align-items: start; }
.title { font-size: 1.1rem; font-weight: 700; letter-spacing: -.01em; margin: 0 0 1rem; }
.editor__foot { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.editor__buttons { display: flex; align-items: center; gap: .5rem; }
.count { font-family: var(--mono); color: var(--on-surface-variant); font-weight: 500; font-size: .85rem; }
.rel-rows { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .5rem; }
.rel-row { background: var(--surface-container-low); border: 1px solid var(--outline-variant); border-radius: var(--radius-sm); padding: .7rem .95rem; display: flex; align-items: center; justify-content: space-between; gap: .75rem; flex-wrap: wrap; }
.rel-row--draft { opacity: .65; border-style: dashed; }
.rel-row__main { display: flex; align-items: center; gap: .6rem; min-width: 0; }
.rel-row__title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rel-row__meta { display: flex; align-items: center; gap: .2rem; }
.rel-row__meta time { font-family: var(--mono); color: var(--on-surface-variant); font-size: .76rem; margin-right: .3rem; }
.chip { display: inline-flex; align-items: center; height: 24px; padding: 0 .55rem; border-radius: 6px; font: 700 .78rem var(--mono); background: var(--primary-container); color: var(--on-primary-container); }
.chip::before { content: "v"; opacity: .6; font-weight: 500; }
.badge { font: 700 .7rem var(--mono); padding: .08rem .45rem; border-radius: 5px; background: var(--surface-container-high); color: var(--on-surface-variant); }

/* ---- ログイン ---- */
.auth { min-height: 55vh; display: grid; place-items: center; }
.auth__card { width: min(400px, 100%); }
.headline { font-size: 1.3rem; font-weight: 700; margin: 0; }
.auth__lead { color: var(--on-surface-variant); margin: .3rem 0 1.25rem; font-size: .9rem; }
.alert { background: color-mix(in srgb, var(--error) 12%, var(--surface)); color: var(--error); border: 1px solid color-mix(in srgb, var(--error) 35%, transparent); border-radius: 8px; padding: .65rem .9rem; margin-bottom: 1rem; font-size: .88rem; }
.muted { color: var(--on-surface-variant); }

/* ---- フッター ---- */
.foot { border-top: 1px solid var(--outline-variant); margin-top: 2rem; }
.foot__inner { display: flex; flex-direction: column; gap: .3rem; padding: 1.75rem 0; }
.foot__mark { font-weight: 700; letter-spacing: -.01em; font-size: .9rem; }
.foot__note { font-family: var(--mono); font-size: .78rem; color: var(--on-surface-variant); }

@media (max-width: 720px) {
  .admin-grid { grid-template-columns: 1fr; }
  .entry { column-gap: 1rem; }
}