/* ====================================================================
   ai-chess MENU — fight-club / tournament bulletin aesthetic
   palette
     ink              #0a0a0c     (background bottom)
     paper            #15151a     (panels)
     bone             #e7e4d8     (primary text)
     ash              #6a6a72     (muted text)
     gold             #c0a060     (rule / decisions / accept)
     crimson          #c04040     (fight / abort)
     gold-dim         #6b5a35
     crimson-dim      #6b2222
   ==================================================================== */

:root {
  --ink:        #0a0a0c;
  --paper:      #15151a;
  --paper-2:    #1d1d23;
  --bone:       #e7e4d8;
  --bone-dim:   #b8b4a3;
  --ash:        #6a6a72;
  --rule:       #2a2a30;
  --gold:       #c0a060;
  --gold-dim:   #6b5a35;
  --crimson:    #c04040;
  --crimson-dim:#6b2222;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: radial-gradient(ellipse at 50% -10%, #1e1e24 0%, var(--ink) 60%) fixed;
  color: var(--bone);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 400;
  line-height: 1.4;
  min-height: 100vh;
}

/* fine grain / film texture */
.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 100;
  opacity: 0.06;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 2px, rgba(255,255,255,0.05) 2px 3px),
    repeating-linear-gradient(90deg, transparent 0 2px, rgba(255,255,255,0.04) 2px 3px);
  mix-blend-mode: overlay;
}

/* ---------- TOPBAR ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 22px 36px;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ash);
  border-bottom: 1px solid var(--rule);
}
.brand {
  color: var(--gold);
  font-weight: 800;
  letter-spacing: 0.22em;
  font-size: 12px;
}
.topbar-meta { display: flex; gap: 10px; align-items: baseline; }
.topbar-meta .sep { opacity: 0.4; }
.topbar-meta .ver { color: var(--gold); }

/* ---------- HERO ---------- */
.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 36px 36px 80px;
}

.badge-row {
  display: flex; align-items: center; gap: 14px;
  font-size: 10px; letter-spacing: 0.32em; color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.badge-line { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--gold-dim), transparent); }
.badge { white-space: nowrap; }

.title {
  font-family: "Major Mono Display", "JetBrains Mono", monospace;
  font-size: clamp(56px, 9vw, 132px);
  line-height: 0.9;
  letter-spacing: 0.04em;
  margin: 0 0 18px;
  text-align: center;
  color: var(--bone);
  text-shadow: 0 0 60px rgba(192,160,96,0.18);
  font-weight: 400;
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 0.18em;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.title .t1, .title .t2 { color: var(--bone); white-space: nowrap; }
.title .t-dot {
  color: var(--crimson);
  display: inline-block;
  transform: translateY(-0.08em);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 0.7; text-shadow: 0 0 18px var(--crimson-dim); }
  50%     { opacity: 1;   text-shadow: 0 0 36px var(--crimson); }
}

.tagline {
  text-align: center;
  color: var(--bone-dim);
  font-size: 14px;
  letter-spacing: 0.02em;
  margin: 0 auto 56px;
  max-width: 620px;
  font-style: italic;
}

/* ---------- MODE CARDS ---------- */
.modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}
.mode {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 26px 22px 22px;
  cursor: pointer;
  text-align: left;
  color: var(--bone);
  font-family: inherit;
  font-size: 13px;
  display: flex; flex-direction: column; gap: 8px;
  min-height: 168px;
  transition: transform 0.18s ease, border-color 0.18s, background 0.18s, box-shadow 0.18s;
  text-decoration: none;
  overflow: hidden;
}
.mode::before {
  content: "";
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(45deg, transparent 0 6px, rgba(255,255,255,0.012) 6px 12px);
  pointer-events: none;
}
.mode:hover {
  transform: translateY(-2px);
  border-color: var(--bone-dim);
  background: var(--paper-2);
}
.mode-num {
  font-size: 10px;
  color: var(--ash);
  letter-spacing: 0.3em;
}
.mode-name {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-top: 2px;
}
.mode-name .x { color: var(--crimson); margin: 0 4px; font-weight: 400; }
.mode-desc {
  color: var(--bone-dim);
  font-size: 12px;
  line-height: 1.5;
  flex: 1;
}
.mode-tag {
  align-self: flex-start;
  padding: 2px 8px;
  font-size: 9px;
  letter-spacing: 0.25em;
  border: 1px solid currentColor;
  border-radius: 2px;
  text-transform: uppercase;
}
.tag-gold    { color: var(--gold); }
.tag-crimson { color: var(--crimson); }
.tag-neutral { color: var(--ash); }

/* Selected card */
.mode[aria-pressed="true"] {
  border-color: var(--gold);
  box-shadow: 0 0 0 1px var(--gold), 0 20px 60px -30px rgba(192,160,96,0.4);
  background: var(--paper-2);
}
.mode[aria-pressed="true"][data-mode="human_vs_ai"] {
  border-color: var(--crimson);
  box-shadow: 0 0 0 1px var(--crimson), 0 20px 60px -30px rgba(192,64,64,0.4);
}

/* ---------- SETUP ---------- */
.setup {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 24px 24px 18px;
  margin-bottom: 28px;
  animation: setup-in 0.3s ease both;
}
@keyframes setup-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}
.setup-head {
  display: flex; align-items: center; gap: 14px;
  border-bottom: 1px dashed var(--rule);
  padding-bottom: 12px; margin-bottom: 18px;
}
.setup-step {
  font-size: 10px; letter-spacing: 0.3em; color: var(--gold);
  text-transform: uppercase;
}
.setup-title {
  font-size: 12px; letter-spacing: 0.06em; color: var(--bone-dim);
}
.setup-tools { margin-left: auto; display: flex; gap: 6px; }
.tool {
  background: transparent; color: var(--bone-dim); border: 1px solid var(--rule);
  padding: 3px 10px; font-size: 11px; font-family: inherit; cursor: pointer;
  border-radius: 3px; letter-spacing: 0.05em;
}
.tool:hover { border-color: var(--bone-dim); color: var(--bone); }

.sides {
  display: grid;
  grid-template-columns: 1fr 56px 1fr;
  gap: 14px;
  align-items: stretch;
}
.side {
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 18px 16px 16px;
  background: rgba(0,0,0,0.18);
  margin: 0;
  display: flex; flex-direction: column; gap: 12px;
  position: relative;
}
.side legend {
  display: flex; align-items: center; gap: 8px;
  padding: 0 8px;
  font-size: 11px; letter-spacing: 0.3em; font-weight: 800;
}
.legend-pip {
  display: inline-block; width: 8px; height: 8px;
  background: var(--bone); border-radius: 50%;
}
.side-white legend { color: var(--bone); }
.side-white .legend-pip { background: var(--bone); }
.side-black legend { color: var(--bone-dim); }
.side-black .legend-pip { background: #1a1a1a; box-shadow: inset 0 0 0 1px var(--bone-dim); }

.field {
  display: flex; flex-direction: column; gap: 4px;
  font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ash);
}
.field select {
  background: var(--paper-2); color: var(--bone);
  border: 1px solid var(--rule); border-radius: 3px;
  padding: 6px 8px;
  font-family: inherit; font-size: 13px; letter-spacing: 0;
  text-transform: none;
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--bone-dim) 50%),
    linear-gradient(-45deg, transparent 50%, var(--bone-dim) 50%);
  background-position: calc(100% - 12px) 12px, calc(100% - 7px) 12px;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.field select:focus { outline: 1px solid var(--gold); border-color: var(--gold); }

.persona-desc {
  font-size: 11px; line-height: 1.5; color: var(--bone-dim);
  margin: 4px 0 0; min-height: 2.4em; font-style: italic;
}
.human-note {
  font-size: 11px; color: var(--crimson); margin: 0;
  border: 1px dashed var(--crimson-dim); padding: 8px 10px; border-radius: 3px;
}

.vs {
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 800; color: var(--crimson);
  letter-spacing: 0.1em;
  position: relative;
}
.vs::before, .vs::after {
  content: ""; position: absolute; left: 50%; transform: translateX(-50%);
  width: 1px; height: 28%; background: var(--rule);
}
.vs::before { top: 0; }
.vs::after  { bottom: 0; }

/* warning + footer */
#setup-warning {
  margin-top: 16px;
  background: rgba(192,64,64,0.08);
  border: 1px solid var(--crimson-dim);
  color: #e0a0a0;
  padding: 10px 14px;
  font-size: 12px; letter-spacing: 0.04em;
  border-radius: 3px;
}
.link-abort {
  background: transparent; border: none; color: var(--crimson);
  text-decoration: underline; cursor: pointer; font: inherit; padding: 0;
}

.setup-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--rule);
}
.back {
  color: var(--ash); text-decoration: none; font-size: 12px;
}
.back:hover { color: var(--bone); }

.start {
  display: inline-flex; align-items: center; gap: 12px;
  background: var(--gold); color: #1a1410;
  border: none; padding: 10px 26px;
  font-family: inherit; font-size: 14px; font-weight: 800; letter-spacing: 0.16em;
  cursor: pointer;
  border-radius: 3px;
  transition: filter 0.15s, transform 0.1s;
  box-shadow: 0 6px 24px -10px var(--gold);
}
.start:hover:not(:disabled) { filter: brightness(1.08); transform: translateY(-1px); }
.start:active:not(:disabled) { transform: translateY(0); }
.start:disabled { background: var(--rule); color: var(--ash); cursor: not-allowed; box-shadow: none; }
.start .kbd {
  font-size: 11px; opacity: 0.7;
  border: 1px solid rgba(0,0,0,0.3); padding: 1px 6px; border-radius: 2px;
}
.setup[data-mode="human_vs_ai"] .start { background: var(--crimson); color: #fff; box-shadow: 0 6px 24px -10px var(--crimson); }

/* ---------- HUD footer ---------- */
.hud {
  display: flex; gap: 26px; justify-content: center;
  margin-top: 32px;
  font-size: 10px; letter-spacing: 0.2em; color: var(--ash);
  text-transform: uppercase;
  border-top: 1px solid var(--rule); padding-top: 16px;
}
.hud code {
  font-family: inherit; color: var(--gold); letter-spacing: 0.02em; text-transform: none;
}

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .modes { grid-template-columns: 1fr; }
  .sides { grid-template-columns: 1fr; }
  .vs { padding: 8px 0; }
}