:root {
  --bg-deep: #152633;
  --bg-mid: #2f4f66;
  --panel: rgba(244, 248, 252, 0.96);
  --ink: #172633;
  --muted: #61717c;
  --shadow: 0 22px 48px rgba(3, 11, 24, 0.28);
  --cell-size: clamp(26px, 4vw, 40px);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 10%, rgba(195, 215, 232, 0.18), transparent 22%),
    radial-gradient(circle at 84% 12%, rgba(116, 145, 173, 0.18), transparent 22%),
    linear-gradient(155deg, var(--bg-deep), var(--bg-mid));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(255,255,255,0.03), transparent 28%),
    linear-gradient(rgba(255,255,255,0.02) 0, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 72px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 0, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 72px);
  opacity: .3;
  pointer-events: none;
}

.mine-app { width: min(1180px, calc(100% - 28px)); margin: 0 auto; padding: 24px 0 40px; }
.mine-topbar,
.mine-controls-panel,
.mine-board-panel,
.rules-card,
.result-overlay-card { border: 1px solid rgba(255,255,255,.12); background: var(--panel); box-shadow: var(--shadow); backdrop-filter: blur(14px); }
.mine-topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 18px; border-radius: 24px; }
.mine-topbar-actions { display: flex; align-items: center; gap: 12px; }
.mine-brand { display: inline-flex; align-items: center; gap: 14px; color: var(--ink); text-decoration: none; }
.mine-brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; background: linear-gradient(135deg, #f1f6fb, #7aa0c0); color: #172633; font-weight: 900; }
.mine-brand-copy { display: grid; gap: 2px; }
.mine-brand-copy strong { font-size: 1.04rem; }
.mine-brand-copy span { color: var(--muted); font-size: .92rem; }
.mine-return,.mine-support,.action-button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 0 18px; border-radius: 999px; border: 1px solid rgba(21,34,55,.12); background: linear-gradient(145deg,#f8fbff,#e2ebf3); color: var(--ink); font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; transition: transform .14s ease, opacity .14s ease; }
.mine-support { background: linear-gradient(145deg,#ffdc42,#f0b90a); color: #24150f; }
.action-button.primary { background: linear-gradient(145deg,#e0edf7,#7aa0c0); color: #162633; }
.mine-return:hover,.mine-support:hover,.action-button:hover,.mine-return:focus-visible,.mine-support:focus-visible,.action-button:focus-visible { transform: translateY(-1px); }
.action-button:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.mine-hero { display: grid; grid-template-columns: minmax(0,.9fr) minmax(360px,1.1fr); gap: 20px; align-items: start; padding: 28px 0 18px; }
.eyebrow { margin: 0 0 12px; color: rgba(255,255,255,.76); font-size: .76rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: #496173; }
.mine-copy h1,.status-copy h2,.rules-card h2,.result-overlay-card h2 { font-family: "Iowan Old Style","Palatino Linotype","Book Antiqua",serif; }
.mine-copy h1 { margin: 0 0 14px; max-width: 10ch; color: #fff8ec; font-size: clamp(2.4rem,5vw,4.5rem); line-height: .96; }
.mine-copy p:last-child { margin: 0; max-width: 60ch; color: rgba(239,245,255,.86); line-height: 1.65; }
.mine-controls-panel { border-radius: 30px; padding: 22px; }
.status-copy h2 { margin: 0; font-size: clamp(1.24rem,2.4vw,1.78rem); line-height: 1.12; }
.notice-text { margin: 10px 0 0; color: var(--muted); line-height: 1.55; }
.setup-panel { margin-top: 18px; }
.setup-label { margin: 0; color: #425069; font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.select-field { display: grid; gap: 10px; }
.select-input { display: inline-flex; align-items: center; min-height: 48px; padding: 0 16px; border: 1px solid rgba(21,34,55,.12); border-radius: 18px; background: linear-gradient(145deg,#f9fbff,#e8eff7); color: var(--ink); font: inherit; font-weight: 700; appearance: none; }
.metric-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-top: 18px; }
.metric-card { display: grid; gap: 4px; padding: 15px 16px; border-radius: 22px; background: linear-gradient(145deg,#eef5fc,#e1eaf4); }
.metric-card span { color: var(--muted); font-size: .82rem; font-weight: 700; }
.metric-card strong { font-size: clamp(1.2rem,2.6vw,1.7rem); }
.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }

.mine-board-panel { border-radius: 30px; padding: 18px; }
.mine-board {
  --rows: 9;
  --columns: 9;
  display: grid;
  grid-template-columns: repeat(var(--columns), var(--cell-size));
  justify-content: center;
  gap: 4px;
}

.mine-cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 0;
  border-radius: 10px;
  background: linear-gradient(145deg, #d6dde4, #b9c7d3);
  color: #1a2832;
  font-weight: 900;
  cursor: pointer;
}

.mine-cell.is-revealed { background: linear-gradient(145deg,#f8f8f4,#e8ecef); }
.mine-cell.is-flagged { color: #b04a34; }
.mine-cell.is-mine { background: linear-gradient(145deg,#efb9b0,#d36a58); color: #4a160d; }
.mine-cell[data-adjacent="1"] { color: #2962b5; }
.mine-cell[data-adjacent="2"] { color: #2b8c4a; }
.mine-cell[data-adjacent="3"] { color: #b7442e; }
.mine-cell[data-adjacent="4"] { color: #5841a8; }
.mine-cell[data-adjacent="5"] { color: #8c4b1d; }
.mine-cell[data-adjacent="6"] { color: #21839a; }
.mine-cell[data-adjacent="7"] { color: #26313a; }
.mine-cell[data-adjacent="8"] { color: #6d7378; }

.result-overlay { position: fixed; inset: 0; display: grid; place-items: center; padding: 20px; background: rgba(6,16,27,.62); z-index: 60; }
.result-overlay[hidden] { display: none !important; }
.result-overlay-card { width: min(460px,100%); border-radius: 28px; padding: 24px; text-align: center; }
.overlay-kicker { margin: 0 0 12px; color: #567089; font-size: .78rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.result-overlay-card h2 { margin: 0 0 12px; font-size: clamp(1.8rem,4vw,2.4rem); }
.overlay-message,.overlay-details { margin: 0 0 14px; color: var(--muted); line-height: 1.6; }

.minenraeumer-seo { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; margin-top: 24px; }
.rules-card { border-radius: 26px; padding: 18px 20px; }
.rules-card h2 { margin: 0 0 14px; font-size: 1.24rem; }
.rules-card p,.rules-card li,.faq-list dd { color: var(--muted); line-height: 1.65; }
.rules-card ol,.rules-card ul { margin: 0; padding-left: 20px; }
.faq-list { margin: 0; display: grid; gap: 10px; }
.faq-list dt { font-weight: 800; }
.faq-list dd { margin: 0; }

@media (max-width: 1080px) {
  .mine-hero,
  .minenraeumer-seo { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .mine-app { width: min(100% - 18px,100%); padding-top: 14px; }
  .mine-topbar { flex-direction: column; align-items: stretch; }
  .mine-topbar-actions,.action-row { flex-direction: column; width: 100%; }
  .metric-grid { grid-template-columns: 1fr; }
}