/* sendai — dark, quiet, disciplined. One accent. Hairlines only. No shadows.
   SENDAI_SPEC §3.4. */

:root {
  --bg:        #101312;   /* warm near-black */
  --bg-raised: #161a19;
  --bg-hover:  #1c2120;
  --line:      #262c2a;   /* hairline */
  --line-soft: #1e2322;
  --ink:       #d7dcda;   /* body text */
  --ink-dim:   #8b938f;   /* meta */
  --ink-mute:  #5f6764;   /* scores, faint */
  --accent:    #4ec9b0;   /* desaturated cyan — interactive only */
  --accent-dim:#2f6b5f;
  --up:        #4ec9b0;
  --down:      #c9695e;
  --danger:    #c9695e;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- Topbar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 760px; margin: 0 auto; padding: 14px 18px;
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line-soft);
}
.wordmark {
  font-family: var(--mono); font-size: 15px; letter-spacing: 0.02em;
  color: var(--ink); text-decoration: none; font-weight: 500;
}
.wordmark::before { content: "▓ "; color: var(--accent); }
.wordmark.big { font-size: 32px; }

.icon-btn {
  background: none; border: 1px solid transparent; color: var(--ink-dim);
  font-size: 18px; line-height: 1; cursor: pointer; padding: 6px 8px; border-radius: 6px;
}
.icon-btn:hover { color: var(--accent); border-color: var(--line); background: var(--bg-hover); }

/* ---- Feed ---- */
.feed { max-width: 760px; margin: 0 auto; padding: 8px 18px 96px; }

.empty-state { color: var(--ink-dim); padding: 22vh 0; text-align: center; }
.linklike {
  background: none; border: none; color: var(--accent); cursor: pointer;
  font: inherit; padding: 0; text-decoration: underline;
}

/* ---- Card ---- */
.card {
  padding: 14px 0 14px 12px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  margin-left: -12px;
  transition: border-color .15s ease, background .15s ease;
}
.card.is-up   { border-left-color: var(--up); background: color-mix(in srgb, var(--up) 5%, transparent); }
.card.is-down { border-left-color: var(--down); background: color-mix(in srgb, var(--down) 5%, transparent); opacity: .78; }

.card-title { margin: 0 0 4px; font-size: 16px; font-weight: 550; line-height: 1.32; }
.card-link { color: var(--ink); text-decoration: none; }
.card-link:hover { color: var(--accent); }
.card-link:visited { color: var(--ink-dim); }

.card-meta { font-size: 12px; color: var(--ink-dim); margin-bottom: 4px; }
.card-meta .mono { font-family: var(--mono); }
.card-meta .source { color: var(--ink-dim); }
.card-meta .score { color: var(--ink-mute); }
.card-meta .dot { color: var(--line); margin: 0 5px; }

.card-dek { margin: 4px 0 8px; font-size: 13.5px; color: var(--ink-dim); line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.card-actions { display: flex; gap: 6px; align-items: center; }
.act {
  background: none; border: 1px solid var(--line); color: var(--ink-dim);
  font-size: 13px; cursor: pointer; padding: 3px 9px; border-radius: 6px; line-height: 1.4;
  transition: border-color .12s ease, color .12s ease, background .12s ease;
}
.act:hover { border-color: var(--accent-dim); color: var(--ink); background: var(--bg-hover); }
.act.up.active   { border-color: var(--up);   color: var(--up); }
.act.down.active { border-color: var(--down); color: var(--down); }
.act.dive { margin-left: auto; }

/* ---- Toast ---- */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--bg-raised); border: 1px solid var(--line); color: var(--ink);
  padding: 9px 15px; border-radius: 8px; font-size: 13px; opacity: 0; pointer-events: none;
  transition: opacity .2s ease, transform .2s ease; z-index: 30; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Modal / Settings ---- */
.modal { position: fixed; inset: 0; z-index: 20; display: flex; align-items: flex-start; justify-content: center; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.55); }
.modal-panel {
  position: relative; margin-top: 6vh; width: min(680px, 92vw); max-height: 86vh; overflow: auto;
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: 12px; padding: 0;
}
.modal-head { display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg-raised); }
.tabs { display: flex; gap: 4px; }
.tab { background: none; border: 1px solid transparent; color: var(--ink-dim); font: inherit;
  padding: 6px 12px; border-radius: 7px; cursor: pointer; font-size: 13px; }
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); border-color: var(--line); background: var(--bg); }

.tab-panel { display: none; padding: 16px; }
.tab-panel.active { display: block; }

.sources-toolbar { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.sources-list { display: flex; flex-direction: column; gap: 0; }
.source-row { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--line-soft); }
.source-row .sr-name { font-weight: 550; }
.source-row .sr-meta { font-family: var(--mono); font-size: 11.5px; color: var(--ink-dim); }
.source-row .sr-spacer { flex: 1; }
.source-row.disabled { opacity: .55; }
.source-row .sr-err { color: var(--down); font-size: 11.5px; font-family: var(--mono); }
.badge { font-family: var(--mono); font-size: 10.5px; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--line); color: var(--ink-dim); }
.badge.rss { color: var(--accent); border-color: var(--accent-dim); }
.badge.off { color: var(--down); border-color: color-mix(in srgb, var(--down) 40%, var(--line)); }

/* ---- Forms ---- */
.field { margin-bottom: 12px; }
.field-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end; }
.field label { display: block; font-size: 12px; color: var(--ink-dim); margin-bottom: 5px; }
.field.checkbox label { display: flex; align-items: center; gap: 7px; color: var(--ink); }
input[type=text], input[type=url], input[type=password], select {
  width: 100%; background: var(--bg); border: 1px solid var(--line); color: var(--ink);
  padding: 8px 10px; border-radius: 7px; font: inherit; font-size: 14px;
}
input[type=url]:focus, input[type=text]:focus, input[type=password]:focus, select:focus {
  outline: none; border-color: var(--accent-dim); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 18%, transparent);
}
input[type=range] { width: 100%; accent-color: var(--accent); }
input[type=checkbox] { accent-color: var(--accent); width: 15px; height: 15px; }

.form-actions { display: flex; align-items: center; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.source-form { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }

.btn {
  background: var(--bg); border: 1px solid var(--line); color: var(--ink); font: inherit;
  padding: 7px 14px; border-radius: 7px; cursor: pointer; font-size: 13.5px;
  transition: border-color .12s ease, background .12s ease, color .12s ease;
}
.btn:hover { border-color: var(--accent-dim); background: var(--bg-hover); }
.btn.primary { border-color: var(--accent-dim); color: var(--accent); }
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 12%, var(--bg)); }
.btn.ghost { border-color: transparent; color: var(--ink-dim); }
.btn.danger { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); color: var(--danger); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.hint { color: var(--ink-mute); font-size: 12px; }
.hint.mono { font-family: var(--mono); }
code { font-family: var(--mono); font-size: 12px; color: var(--accent); }
hr { border: none; border-top: 1px solid var(--line); margin: 16px 0; }

/* ---- Login ---- */
.login-body { display: flex; min-height: 100vh; align-items: center; justify-content: center; }
.login { width: min(320px, 88vw); text-align: center; }
.login-sub { color: var(--ink-dim); margin: 4px 0 22px; letter-spacing: .1em; font-size: 12px; }
.login-form { display: flex; flex-direction: column; gap: 12px; }
.login-form .remember { display: flex; align-items: center; gap: 8px; justify-content: center; color: var(--ink-dim); font-size: 12.5px; }
.login-error { color: var(--down); font-size: 13px; margin-bottom: 8px; }

/* ---- /algo debug page ---- */
.algo-tag { font-family: var(--mono); color: var(--accent); font-size: 13px; }
.algo { max-width: 860px; margin: 0 auto; padding: 12px 18px 80px; }
.algo-block { margin: 8px 0 26px; }
.algo-block h2 { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-dim); border-bottom: 1px solid var(--line); padding-bottom: 6px; margin: 0 0 12px; }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; font-size: 13.5px; }
.kv span { color: var(--ink-dim); }
.kv b { text-align: right; font-weight: 500; }
.mono.good, .good { color: var(--accent); }
.mono.warn, .warn { color: var(--down); }
.algo-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.algo-table.small { font-size: 12px; }
.algo-table th { text-align: right; color: var(--ink-mute); font-weight: 500; font-family: var(--mono);
  font-size: 11px; text-transform: uppercase; letter-spacing: .04em; padding: 4px 8px; border-bottom: 1px solid var(--line); }
.algo-table th:first-child, .algo-table td:first-child { text-align: left; }
.algo-table th:nth-child(2), .algo-table td.algo-title, .algo-table td:nth-child(2) { text-align: left; }
.algo-table td { padding: 5px 8px; border-bottom: 1px solid var(--line-soft); text-align: right; white-space: nowrap; }
.algo-table td.algo-title { white-space: normal; color: var(--ink); max-width: 340px; }
.algo-table .mono { font-family: var(--mono); }
@media (max-width: 600px) { .algo-table.small { font-size: 11px; } .algo-table td, .algo-table th { padding: 4px 5px; } }

/* ---- Deep Dive: button, reader, archive ---- */
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.navlink { color: var(--ink-dim); text-decoration: none; font-size: 13px; letter-spacing: .02em; }
.navlink:hover { color: var(--accent); }
.act.dive.done { border-color: var(--accent-dim); color: var(--accent); }

.dive { max-width: 720px; margin: 0 auto; padding: 18px 20px 100px; }
.dive-article { }
.dive-kicker { color: var(--accent); font-size: 11.5px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 12px; }
.dive-hed { font-size: 30px; line-height: 1.15; font-weight: 650; margin: 0 0 10px; letter-spacing: -0.01em; }
.dive-dek { font-size: 17px; color: var(--ink-dim); line-height: 1.4; margin: 0 0 14px; }
.dive-byline { font-size: 12px; color: var(--ink-mute); border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 20px; }
.dive-body { font-size: 16.5px; line-height: 1.7; color: var(--ink); }
.dive-body p { margin: 0 0 18px; }
.dive-body a { color: var(--accent); }
.dive-body h2, .dive-body h3 { font-size: 18px; margin: 26px 0 10px; }
.dive-body blockquote { border-left: 2px solid var(--line); margin: 18px 0; padding-left: 16px; color: var(--ink-dim); }

.dive-reality { margin: 28px 0; padding: 16px 18px; border: 1px solid var(--accent-dim);
  border-radius: 10px; background: color-mix(in srgb, var(--accent) 6%, transparent); }
.dive-reality h2 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .07em; color: var(--accent); }
.dive-reality div { font-size: 14.5px; line-height: 1.6; color: var(--ink); }
.dive-reality p { margin: 0 0 10px; }

.dive-sources { margin: 28px 0 12px; }
.dive-sources h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-dim);
  border-bottom: 1px solid var(--line); padding-bottom: 6px; }
.dive-sources ol { padding-left: 22px; margin: 12px 0; }
.dive-sources li { margin: 8px 0; font-size: 14px; line-height: 1.5; }
.dive-sources a { color: var(--accent); }
.dive-sources .src-meta { display: block; color: var(--ink-mute); font-size: 11.5px; margin-top: 2px; }
.dive-disclaimer { color: var(--ink-mute); font-size: 12px; font-style: italic; margin-top: 24px; border-top: 1px solid var(--line-soft); padding-top: 14px; }

.dive-state { text-align: center; padding: 20vh 0; color: var(--ink-dim); }
.blink { color: var(--accent); font-size: 15px; }
@media (prefers-reduced-motion: no-preference) { .blink { animation: pulse 1.6s ease-in-out infinite; } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .4; } }

.dives { max-width: 760px; margin: 0 auto; padding: 12px 18px 90px; }
.dives-head { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 10px; margin-bottom: 8px; }
.dives-head h1 { font-size: 20px; margin: 0; }
.dive-row { display: block; padding: 14px 0; border-bottom: 1px solid var(--line-soft); text-decoration: none; color: var(--ink); }
.dive-row:hover .dive-row-hed { color: var(--accent); }
.dive-row-hed { font-size: 16px; font-weight: 550; line-height: 1.3; }
.dive-row-dek { font-size: 13.5px; color: var(--ink-dim); margin: 3px 0; }
.dive-row-meta { font-size: 11.5px; color: var(--ink-mute); }

/* ---- Focus & motion ---- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ---- Mobile ---- */
@media (max-width: 520px) {
  body { font-size: 15px; }
  .feed, .topbar { padding-left: 14px; padding-right: 14px; }
  .field-row { gap: 10px; }
  .act.dive { font-size: 12px; padding: 3px 7px; }
}