/* Riemannova hypotéza — ioas.pro/riemann */

:root {
  color-scheme: dark;
  --bg: #121211;
  --surface: #16161a;
  --panel: #1a1a19;
  --line: rgba(255, 255, 255, 0.09);
  --text: #ffffff;
  --sec: #c3c2b7;
  --muted: #8b8a81;
  --s1: #3987e5;
  --s2: #d95926;
  --s3: #199e70;
  --s4: #c98500;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

/* ── hlavička ─────────────────────────────────────────────── */

.top {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px max(20px, calc(50vw - 560px));
  background: rgba(18, 18, 17, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--text);
  text-decoration: none;
}
.top nav { display: flex; gap: 18px; flex-wrap: wrap; }
.top nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13.5px;
}
.top nav a:hover { color: var(--text); }

/* ── sekcie ───────────────────────────────────────────────── */

section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px max(20px, 5vw);
}
section.text, .phead { max-width: 78ch; }
.hero { padding-top: 72px; padding-bottom: 24px; }

.eyebrow {
  margin: 0 0 12px;
  font: 500 12.5px/1 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
h1 {
  margin: 0 0 20px;
  font: 600 clamp(38px, 7vw, 68px)/1.04 var(--serif);
  letter-spacing: -0.02em;
}
h2 {
  margin: 0 0 14px;
  font: 600 clamp(21px, 3vw, 27px)/1.25 var(--serif);
  letter-spacing: -0.01em;
}
p { margin: 0 0 16px; color: var(--sec); }
.lead { font-size: 18.5px; max-width: 68ch; color: #dedcd2; }
.note { font-size: 14px; color: var(--muted); max-width: 66ch; }
em { color: var(--text); font-style: italic; }
strong { color: var(--text); font-weight: 600; }

.claim {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--s1);
  background: linear-gradient(90deg, rgba(57, 135, 229, 0.10), transparent 70%);
  font: 400 clamp(18px, 2.6vw, 23px)/1.5 var(--serif);
  color: var(--text);
}

.m { font-family: var(--serif); font-style: italic; color: var(--text); white-space: nowrap; }
.formula {
  margin: 22px 0;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  font: 400 clamp(15px, 2.2vw, 19px)/1.9 var(--serif);
  color: var(--text);
  text-align: center;
  overflow-x: auto;
}
.formula sub.pp { font-size: 0.62em; font-style: normal; color: var(--muted); }

/* ── štatistiky ───────────────────────────────────────────── */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px;
  margin: 34px 0 22px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.stat { padding: 18px 20px; background: var(--panel); }
.stat .v {
  display: block;
  font: 600 clamp(24px, 3.4vw, 32px)/1.15 var(--serif);
  letter-spacing: -0.01em;
}
.stat .k { display: block; margin-top: 6px; font-size: 13px; color: var(--muted); line-height: 1.45; }

/* ── panely ───────────────────────────────────────────────── */

.panel { border-top: 1px solid var(--line); }
.phead { margin-bottom: 22px; }
.phead p { font-size: 15.5px; }

.segmented {
  display: inline-flex;
  padding: 3px;
  margin-bottom: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 9px;
}
.segmented button {
  padding: 7px 15px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font: 500 13.5px var(--sans);
  cursor: pointer;
}
.segmented button[aria-pressed="true"] { background: rgba(255, 255, 255, 0.09); color: var(--text); }

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 26px;
  margin-bottom: 14px;
  padding: 13px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.controls label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}
.controls output { min-width: 3ch; font: 13px var(--mono); color: var(--text); }
input[type="range"] {
  width: clamp(140px, 26vw, 260px);
  accent-color: var(--s1);
  cursor: pointer;
}
select, .btn {
  padding: 6px 12px;
  background: #24241f;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  font: 13px var(--sans);
  cursor: pointer;
}
.pill {
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 12.5px;
  color: var(--sec);
}
.pill b { color: var(--text); }

/* ── plátna ───────────────────────────────────────────────── */

.canvas-wrap {
  position: relative;
  height: 340px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.canvas-wrap.tall { height: min(78vh, 680px); }
.canvas-wrap.short { height: 260px; }
.canvas-wrap.square { height: min(70vw, 520px); max-width: 560px; margin-inline: auto; }
.canvas-wrap canvas { display: block; width: 100%; height: 100%; }
.canvas-wrap canvas.overlay { position: absolute; inset: 0; cursor: crosshair; }

.status {
  margin: 8px 0 14px;
  font: 12px var(--mono);
  color: var(--muted);
}
.caption { font-size: 14px; color: var(--muted); max-width: 76ch; }

.tip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 11px;
  background: rgba(10, 10, 9, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  font: 12.5px/1.45 var(--mono);
  color: var(--sec);
  white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.tip b { color: var(--text); font-weight: 600; }
.tip .tip-hi { color: var(--s2); }
.tip .muted { color: var(--muted); }

.readout {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 12px;
  font: 13px var(--mono);
  color: var(--sec);
}
.readout b { color: var(--text); }
.readout b.hit { color: var(--s2); }
.readout .muted { color: var(--muted); }

/* ── legendy ──────────────────────────────────────────────── */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--sec);
}
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.sw {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  flex: none;
}
.sw.dashed { background: repeating-linear-gradient(90deg, #fff 0 4px, transparent 4px 7px); border: 0; height: 3px; width: 18px; }
.sw.dashed.muted-sw { background: repeating-linear-gradient(90deg, #8b8a81 0 4px, transparent 4px 7px); }
.sw.wheel {
  width: 14px; height: 14px; border-radius: 50%;
  background: conic-gradient(#ff4d4d, #ffe14d, #4dff85, #4de1ff, #4d6bff, #e14dff, #ff4d4d);
}

/* ── zoznam núl ───────────────────────────────────────────── */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.chips li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 12.5px var(--mono);
  color: var(--sec);
}
.chips li.muted { color: var(--muted); font-family: var(--sans); }
.chip-n { color: var(--s2); font-weight: 600; }

/* ── tabuľka ──────────────────────────────────────────────── */

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
thead th {
  position: sticky;
  top: 0;
  padding: 11px 14px;
  background: var(--panel);
  text-align: left;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
tbody td { padding: 9px 14px; border-bottom: 1px solid rgba(255, 255, 255, 0.05); color: var(--sec); }
tbody tr:last-child td { border-bottom: 0; }
tbody td:first-child { color: var(--text); font-family: var(--mono); }
td.num { font-family: var(--mono); }

/* ── odkazy, päta ─────────────────────────────────────────── */

a { color: var(--s1); }
a:hover { color: #7fb2f0; }
.sources { font-size: 14px; color: var(--muted); }

footer {
  padding: 30px max(20px, 5vw) 56px;
  max-width: 1120px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 640px) {
  section { padding: 40px 18px; }
  .canvas-wrap { height: 300px; }
  .canvas-wrap.tall { height: 66vh; }
  .top nav { gap: 12px; }
  .top nav a { font-size: 12.5px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}