/* ============================================================
   WORLDLINE · Sistema visual
   Minimalista · oscuro por defecto · Apple-like · mobile-first
   ============================================================ */

:root {
  --bg: #0a0a0f;
  --bg2: #101018;
  --card: rgba(255,255,255,.045);
  --card-border: rgba(255,255,255,.08);
  --text: #eceaf4;
  --muted: #8b8a99;
  --line: rgba(255,255,255,.10);
  --accent: #6c63ff;        /* violeta worldline */
  --accent-soft: rgba(108,99,255,.16);
  --worldA: #6c63ff;
  --worldB: #e0526f;
  --worldC: #e8a33d;
  --cont:   #2fa98c;        /* Continuidad */
  --danger: #e0526f;
  --ok: #2fa98c;
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}

[data-theme="light"] {
  --bg: #f4f4f8;
  --bg2: #ffffff;
  --card: rgba(0,0,0,.035);
  --card-border: rgba(0,0,0,.08);
  --text: #17151f;
  --muted: #6b6a78;
  --line: rgba(0,0,0,.10);
  --accent-soft: rgba(108,99,255,.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: calc(74px + env(safe-area-inset-bottom));
  -webkit-font-smoothing: antialiased;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top);
}
.topbar-inner {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px;
}
.brand { display: flex; align-items: center; gap: 9px; cursor: pointer; }
.brand-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  animation: pulse 3s ease-in-out infinite;
}
@keyframes pulse { 50% { box-shadow: 0 0 3px var(--accent); opacity:.7 } }
.brand-name { font-weight: 800; letter-spacing: .22em; font-size: .82rem; }
.topbar-actions { display: flex; gap: 8px; }
.icon-btn {
  background: var(--card); border: 1px solid var(--card-border); color: var(--text);
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: .95rem;
}
.icon-btn:active { transform: scale(.93); }

/* ---------- layout ---------- */
main { max-width: 860px; margin: 0 auto; padding: 18px; }
.view { animation: fadeUp .28s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px);} }
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: .9rem; line-height: 1.45; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.view-head {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px; margin-bottom: 16px;
}
h1 { font-size: 1.5rem; font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: 1.05rem; font-weight: 700; }
h3 { font-size: .95rem; font-weight: 700; }

/* ---------- cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.card.click { cursor: pointer; transition: transform .15s ease, border-color .15s; }
.card.click:active { transform: scale(.985); }
.card.click:hover { border-color: var(--accent); }
.card-label {
  font-size: .68rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 8px;
}
.card-big { font-size: 1.6rem; font-weight: 800; letter-spacing: -.02em; }

/* ---------- nexus ---------- */
.nexus-hero { position: relative; margin: -6px -6px 14px; }
#nexusCanvas { width: 100%; display: block; border-radius: var(--radius); }
.nexus-hero-text { position: absolute; left: 18px; bottom: 14px; }
.nexus-hero-text h1 { font-size: 1.7rem; }
.nexus-cta { display: flex; gap: 10px; margin-bottom: 18px; }
.nexus-cta .btn { flex: 1; }
.nexus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.nexus-grid .span2 { grid-column: span 2; }
@media (min-width: 700px) { .nexus-grid { grid-template-columns: repeat(3, 1fr);} .nexus-grid .span2 { grid-column: span 2;} }

/* ---------- buttons ---------- */
.btn {
  border: 1px solid var(--card-border); border-radius: 14px;
  padding: 13px 18px; font-size: .95rem; font-weight: 650;
  cursor: pointer; font-family: var(--font);
  background: var(--card); color: var(--text);
  transition: transform .12s, filter .15s;
}
.btn:active { transform: scale(.96); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }
.btn.small { padding: 8px 14px; font-size: .82rem; border-radius: 11px; }
.btn.tiny { padding: 5px 10px; font-size: .74rem; border-radius: 9px; }
.btn:disabled { opacity: .4; pointer-events: none; }

/* ---------- segmented ---------- */
.seg { display: flex; background: var(--card); border: 1px solid var(--card-border); border-radius: 12px; padding: 3px; }
.seg button {
  border: 0; background: transparent; color: var(--muted);
  padding: 7px 13px; border-radius: 9px; font-size: .8rem; font-weight: 650; cursor: pointer; font-family: var(--font);
}
.seg button.on { background: var(--accent); color: #fff; }

/* ---------- chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips.scroll-x { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 6px; margin-bottom: 10px; scrollbar-width: none; }
.chips.scroll-x::-webkit-scrollbar { display: none; }
.chip {
  border: 1px solid var(--card-border); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 7px 14px; font-size: .8rem; cursor: pointer;
  white-space: nowrap; font-family: var(--font); font-weight: 550;
}
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- forms ---------- */
label.f { display: block; font-size: .78rem; font-weight: 700; color: var(--muted); margin: 14px 0 6px; letter-spacing: .04em; }
input[type=text], input[type=number], input[type=date], textarea, select {
  width: 100%; background: var(--card); border: 1px solid var(--card-border);
  color: var(--text); border-radius: 12px; padding: 12px 14px; font-size: .95rem;
  font-family: var(--font); outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { resize: vertical; min-height: 74px; }
input[type=range] { width: 100%; accent-color: var(--accent); }
.frow { display: flex; gap: 10px; }
.frow > * { flex: 1; }

/* ---------- wizard ---------- */
.steps { display: flex; gap: 6px; }
.steps span { width: 22px; height: 4px; border-radius: 4px; background: var(--card-border); transition: background .2s; }
.steps span.on { background: var(--accent); }
.wizard-nav { display: flex; justify-content: space-between; gap: 10px; margin-top: 20px; }
.wizard-nav .btn { flex: 1; }
.wstep h2 { margin-bottom: 4px; }
.wstep .sub { color: var(--muted); font-size: .85rem; margin-bottom: 12px; font-style: italic; }

/* ---------- world cards ---------- */
.world-card { border-left: 3px solid var(--worldA); position: relative; }
.world-card .wc-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.world-tag {
  font-size: .66rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent);
}
.wc-del { background: none; border: 0; color: var(--muted); font-size: 1rem; cursor: pointer; }

/* ---------- variables ---------- */
.var-card { padding: 14px; }
.var-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.var-attrs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; margin-top: 10px; }
.attr { font-size: .78rem; }
.attr b { display: block; color: var(--muted); font-weight: 650; font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 3px; }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .72rem; font-weight: 700; }
.pill.hi { background: rgba(224,82,111,.16); color: var(--worldB); }
.pill.md { background: rgba(232,163,61,.16); color: var(--worldC); }
.pill.lo { background: rgba(47,169,140,.16); color: var(--cont); }

/* ---------- relations ---------- */
.rel-row {
  display: flex; align-items: center; gap: 8px; font-size: .84rem;
  background: var(--card); border: 1px solid var(--card-border); border-radius: 12px; padding: 10px 12px;
}
.rel-arrow { font-weight: 800; }
.rel-arrow.pos { color: var(--cont); }
.rel-arrow.neg { color: var(--worldB); }

/* ---------- branch compare ---------- */
.bc-worlds { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 14px 0; }
@media (max-width: 520px) { .bc-worlds { grid-template-columns: 1fr; } }
.bc-world { border-top: 3px solid var(--worldA); }
.bc-stat { display: flex; justify-content: space-between; font-size: .84rem; padding: 5px 0; border-bottom: 1px dashed var(--line); }
.bc-stat:last-child { border-bottom: 0; }
.bc-stat b { font-variant-numeric: tabular-nums; }
.divergence-wrap { margin: 16px 0; }
#divCanvas, .div-canvas { width: 100%; border-radius: var(--radius); display: block; background: var(--bg2); border: 1px solid var(--card-border); }
.horizon-legend { display: flex; justify-content: space-between; font-size: .68rem; color: var(--muted); padding: 6px 4px 0; text-transform: uppercase; letter-spacing: .06em; }

/* ---------- butterfly ---------- */
.butterfly-card {
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  background: linear-gradient(135deg, var(--accent-soft), transparent 60%);
}
.butterfly-card .bf-ico { font-size: 1.5rem; }
.reading {
  border-left: 3px solid var(--accent); padding: 12px 14px; margin: 12px 0;
  background: var(--accent-soft); border-radius: 0 12px 12px 0;
  font-style: italic; font-size: .92rem; line-height: 1.5;
}

/* ---------- sensitivity bars ---------- */
.sens-row { display: flex; align-items: center; gap: 10px; font-size: .82rem; padding: 6px 0; }
.sens-name { width: 38%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sens-track { flex: 1; height: 8px; background: var(--card-border); border-radius: 6px; overflow: hidden; }
.sens-fill { height: 100%; border-radius: 6px; background: var(--accent); transition: width .5s ease; }
.sens-val { width: 44px; text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); font-size: .74rem; }

/* ---------- causal field ---------- */
#causalSvg { width: 100%; border-radius: var(--radius); background: var(--bg2); border: 1px solid var(--card-border); touch-action: none; }
.causal-controls { margin-top: 12px; }

/* ---------- observatory ---------- */
.note-card .note-cat { font-size: .66rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.note-card h3 { margin: 5px 0; }
.book-badge { font-size: .72rem; background: var(--accent-soft); color: var(--accent); padding: 2px 9px; border-radius: 999px; font-weight: 700; }

/* ---------- fork list rows ---------- */
.fork-row { display: flex; align-items: center; gap: 12px; }
.fork-glyph {
  width: 42px; height: 42px; flex: none; border-radius: 13px;
  display: flex; align-items: center; justify-content: center; font-size: 1.15rem;
  background: var(--accent-soft);
}
.fork-meta { flex: 1; min-width: 0; }
.fork-meta h3 { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.status-dot.open { background: var(--worldC); box-shadow: 0 0 8px var(--worldC); }
.status-dot.resolved { background: var(--cont); }
.status-dot.due { background: var(--worldB); box-shadow: 0 0 8px var(--worldB); animation: pulse 1.6s infinite; }

/* ---------- modal ---------- */
.modal {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(0,0,0,.55); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  display: flex; align-items: flex-end; justify-content: center;
}
@media (min-width: 600px) { .modal { align-items: center; } }
.modal-card {
  background: var(--bg2); border: 1px solid var(--card-border);
  border-radius: 22px 22px 0 0; width: 100%; max-width: 600px;
  max-height: 88vh; overflow-y: auto; padding: 22px 20px calc(22px + env(safe-area-inset-bottom));
  animation: slideUp .25s ease;
}
@media (min-width: 600px) { .modal-card { border-radius: 22px; } }
@keyframes slideUp { from { transform: translateY(40px); opacity: 0; } }
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }

/* ---------- tab bar ---------- */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-around; align-items: center;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-top: 1px solid var(--line);
  padding: 8px 6px calc(8px + env(safe-area-inset-bottom));
}
.tab {
  background: none; border: 0; color: var(--muted); font-family: var(--font);
  font-size: .62rem; font-weight: 650; letter-spacing: .02em;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  cursor: pointer; padding: 4px 10px; border-radius: 12px; min-width: 58px;
}
.tab-ico { font-size: 1.15rem; line-height: 1; }
.tab.on { color: var(--accent); }
.tab-new .tab-ico.big {
  width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 1.6rem;
  box-shadow: 0 4px 18px color-mix(in srgb, var(--accent) 55%, transparent);
  margin-bottom: -2px;
}

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: calc(90px + env(safe-area-inset-bottom)); left: 50%;
  transform: translateX(-50%); z-index: 99;
  background: var(--accent); color: #fff; padding: 11px 20px; border-radius: 999px;
  font-size: .85rem; font-weight: 650; box-shadow: 0 6px 24px rgba(0,0,0,.35);
  animation: slideUp .25s ease;
}

/* ---------- misc ---------- */
.divider { height: 1px; background: var(--line); margin: 16px 0; }
.tag-line { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.empty {
  text-align: center; color: var(--muted); padding: 40px 20px; font-size: .9rem;
  border: 1px dashed var(--card-border); border-radius: var(--radius);
}
.section-title { font-size: .7rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin: 22px 0 10px; }
details.adv { margin-top: 10px; }
details.adv summary { cursor: pointer; color: var(--accent); font-size: .84rem; font-weight: 650; }
.mono { font-variant-numeric: tabular-nums; }