:root {
  --ink: #ece7dc;
  --dim: rgba(236, 231, 220, 0.56);
  --faint: rgba(236, 231, 220, 0.24);
  --amber: #ffb24a;
  --red: #ff5236;
  --font: "DIN Condensed", "Avenir Next Condensed", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --text: "PingFang SC", "Helvetica Neue", "Avenir Next", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: #050505; overflow: hidden; color: var(--ink); font-family: var(--text); -webkit-font-smoothing: antialiased; user-select: none; -webkit-user-select: none; }
#gl { position: fixed; inset: 0; width: 100vw; height: 100vh; display: block; background: #000; }

/* ---------- loading ---------- */
#loading { position: fixed; inset: 0; display: grid; place-items: center; background: #060606; z-index: 30; transition: opacity 0.9s ease 0.1s; }
body.ready #loading { opacity: 0; pointer-events: none; }
.load-box { width: min(420px, 70vw); text-align: center; }
.load-title { font-size: 44px; letter-spacing: 0.5em; text-indent: 0.5em; font-weight: 300; margin-bottom: 28px; }
.load-track { height: 2px; background: rgba(255, 255, 255, 0.12); overflow: hidden; }
#load-bar { height: 100%; width: 0; background: var(--amber); transition: width 0.25s ease; }
#load-msg { margin-top: 14px; font-size: 12px; letter-spacing: 0.14em; color: var(--dim); font-family: var(--mono); }
.notice-t { font: 400 15px/1.9 var(--text); letter-spacing: 0.06em; margin-top: -6px; }
.notice-a { display: inline-block; margin-top: 24px; font: 400 12px var(--text); letter-spacing: 0.2em; color: var(--dim); text-underline-offset: 4px; }

#ui { position: fixed; inset: 0; pointer-events: none; z-index: 10; }

/* ---------- HUD ---------- */
.hud { position: absolute; inset: 0; opacity: 0; transition: opacity 0.4s ease; }
body[data-mode="play"] .hud { opacity: 1; }
.cross { position: absolute; left: 50%; top: 50%; width: 0; height: 0; --gap: 6px; transition: opacity 0.12s; }
.cross i { position: absolute; background: rgba(255, 255, 255, 0.9); box-shadow: 0 0 2px rgba(0, 0, 0, 0.9); }
.cross .t, .cross .b { width: 2px; height: 9px; left: -1px; }
.cross .l, .cross .r { height: 2px; width: 9px; top: -1px; }
.cross .t { bottom: var(--gap); }
.cross .b { top: var(--gap); }
.cross .l { right: var(--gap); }
.cross .r { left: var(--gap); }
.cross .d { width: 2px; height: 2px; left: -1px; top: -1px; opacity: 0.7; }
.hitmark { position: absolute; left: 50%; top: 50%; width: 0; height: 0; opacity: 0; }
.hitmark i { position: absolute; width: 11px; height: 2px; background: #fff; box-shadow: 0 0 3px #000; left: 7px; top: -1px; transform-origin: -7px 1px; }
.hitmark i:nth-child(1) { transform: rotate(45deg); }
.hitmark i:nth-child(2) { transform: rotate(135deg); }
.hitmark i:nth-child(3) { transform: rotate(225deg); }
.hitmark i:nth-child(4) { transform: rotate(315deg); }
.hitmark.on { animation: hit 0.22s ease-out; }
.hitmark.crit i { background: var(--amber); }
.hitmark.kill i { background: var(--red); width: 15px; }
@keyframes hit { 0% { opacity: 1; transform: scale(1.5); } 100% { opacity: 0; transform: scale(1); } }

.dmg { position: absolute; left: 50%; top: 50%; width: 0; height: 0; }
.dmg .arc { position: absolute; left: -130px; top: -130px; width: 260px; height: 260px; border-radius: 50%; animation: arc 0.9s ease-out forwards;
  background: conic-gradient(from -24deg, transparent 0deg, rgba(255, 70, 40, 0.9) 24deg, transparent 48deg, transparent 360deg);
  -webkit-mask: radial-gradient(circle, transparent 58%, #000 60%, #000 67%, transparent 70%); mask: radial-gradient(circle, transparent 58%, #000 60%, #000 67%, transparent 70%); }
@keyframes arc { 0% { opacity: 1; } 100% { opacity: 0; } }

.obj { position: absolute; left: 34px; top: 30px; max-width: 46vw; text-shadow: 0 1px 6px rgba(0, 0, 0, 0.8); }
.obj-k { font: 600 11px var(--text); letter-spacing: 0.3em; color: var(--amber); margin-bottom: 6px; }
.obj-t { font: 500 19px var(--text); letter-spacing: 0.04em; }
.obj-s { font: 400 13px var(--text); color: var(--dim); margin-top: 4px; letter-spacing: 0.06em; }

.ammo { position: absolute; right: 38px; bottom: 30px; text-align: right; font-family: var(--font); text-shadow: 0 1px 8px rgba(0, 0, 0, 0.8); }
.ammo .mag { font-size: 64px; line-height: 0.9; font-weight: 700; letter-spacing: 0.02em; }
.ammo .sep { display: inline-block; width: 1px; height: 26px; background: var(--faint); margin: 0 12px 6px; vertical-align: bottom; }
.ammo .res { font-size: 28px; color: var(--dim); }
.ammo .wname { font: 500 11px var(--text); letter-spacing: 0.28em; color: var(--dim); margin-top: 6px; }
.ammo.low .mag { color: var(--amber); }
.ammo.empty .mag { color: var(--red); }

.hp { position: absolute; left: 38px; bottom: 30px; width: 230px; font-family: var(--font); text-shadow: 0 1px 8px rgba(0, 0, 0, 0.8); }
.hp-n { font-size: 44px; font-weight: 700; line-height: 0.9; }
.hp-bar { height: 4px; background: rgba(255, 255, 255, 0.16); margin-top: 8px; }
.hp-bar i { display: block; height: 100%; width: 100%; background: var(--ink); transition: width 0.25s ease; }
.hp-k { font: 500 11px var(--text); letter-spacing: 0.3em; color: var(--dim); margin-top: 7px; }
.hp.low .hp-n { color: var(--red); }
.hp.low .hp-bar i { background: var(--red); }

.msg { position: absolute; left: 0; right: 0; top: 23%; text-align: center; opacity: 0; transform: translateY(8px); transition: opacity 0.5s ease, transform 0.5s ease; text-shadow: 0 2px 14px rgba(0, 0, 0, 0.85); }
.msg.show { opacity: 1; transform: none; }
.msg-a { font: 300 40px var(--text); letter-spacing: 0.4em; text-indent: 0.4em; }
.msg-b { font: 400 14px var(--text); letter-spacing: 0.22em; color: var(--dim); margin-top: 12px; }

.tip { position: absolute; left: 0; right: 0; bottom: 21%; text-align: center; font: 500 13px var(--text); letter-spacing: 0.2em; color: var(--amber); opacity: 0; transition: opacity 0.2s; text-shadow: 0 1px 6px #000; }
.tip.show { opacity: 1; }
.stat { position: absolute; right: 14px; top: 10px; font: 11px var(--mono); color: rgba(255, 255, 255, 0.55); white-space: pre; text-align: right; }

/* ---------- menu ---------- */
.menu { position: absolute; inset: 0; display: flex; align-items: center; pointer-events: auto; opacity: 0; visibility: hidden; transition: opacity 0.5s ease, visibility 0.5s;
  background: linear-gradient(90deg, rgba(4, 5, 6, 0.86) 0%, rgba(4, 5, 6, 0.6) 34%, rgba(4, 5, 6, 0) 68%); }
body[data-mode="menu"] .menu, body[data-mode="pause"] .menu, body[data-mode="dead"] .menu, body[data-mode="win"] .menu { opacity: 1; visibility: visible; }
body[data-mode="dead"] .menu { background: linear-gradient(90deg, rgba(20, 2, 0, 0.9) 0%, rgba(14, 2, 0, 0.66) 40%, rgba(8, 0, 0, 0.25) 100%); }
.menu-in { margin-left: clamp(28px, 7vw, 120px); width: min(440px, 86vw); }
.brand-zh { font: 200 84px var(--text); letter-spacing: 0.36em; line-height: 1; }
.brand-en { font: 600 13px var(--font); letter-spacing: 0.56em; color: var(--amber); margin-top: 16px; }
.lead { margin-top: 30px; font: 400 15px/1.9 var(--text); color: var(--dim); letter-spacing: 0.05em; min-height: 58px; }
.lead small { display: block; font-size: 13px; color: var(--ink); margin-top: 6px; letter-spacing: 0.08em; }
.btns { margin-top: 26px; display: flex; gap: 12px; }
.btn { font: 500 15px var(--text); letter-spacing: 0.32em; text-indent: 0.32em; color: var(--ink); background: rgba(255, 255, 255, 0.04); border: 1px solid var(--faint); padding: 14px 26px; cursor: pointer; transition: background 0.2s, border-color 0.2s, color 0.2s; }
.btn:hover { background: rgba(255, 255, 255, 0.1); border-color: var(--dim); }
.btn.primary { background: var(--amber); border-color: var(--amber); color: #17110a; }
.btn.primary:hover { background: #ffc673; border-color: #ffc673; }
.opts { margin-top: 32px; display: grid; gap: 12px; }
.opts label { display: grid; grid-template-columns: 78px 1fr 46px; align-items: center; font: 400 13px var(--text); color: var(--dim); letter-spacing: 0.14em; }
.opts select { grid-column: 2 / 4; background: rgba(255, 255, 255, 0.05); color: var(--ink); border: 1px solid var(--faint); padding: 7px 10px; font: 13px var(--text); outline: none; }
.opts input[type="range"] { width: 100%; accent-color: var(--amber); }
.opts b { font: 500 12px var(--mono); color: var(--ink); text-align: right; }
.keys { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px 16px; font: 400 12px var(--text); color: var(--dim); letter-spacing: 0.06em; }
kbd { display: inline-block; font: 11px var(--mono); color: var(--ink); border: 1px solid var(--faint); border-radius: 3px; padding: 2px 5px; margin-right: 3px; background: rgba(255, 255, 255, 0.04); }
.foot { margin-top: 22px; font: 11px var(--mono); color: var(--faint); letter-spacing: 0.06em; min-height: 14px; }
@media (max-height: 640px) { .brand-zh { font-size: 56px; } .keys { display: none; } .opts { margin-top: 18px; } }