:root {
  --cyan: #22e6ff; --magenta: #ff2bd6; --orange: #ff8a1f; --lime: #9dff3a; --red: #ff3355; --ink: #e8f4ff; --dim: #7d8fb0;
  --panel: rgba(8, 10, 22, 0.86); --line: rgba(34, 230, 255, 0.35); --wc: #22e6ff;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "Cascadia Mono", "Consolas", "SFMono-Regular", ui-monospace, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #03040a; color: var(--ink); font-family: var(--font); user-select: none; }
canvas#game { position: fixed; inset: 0; width: 100vw; height: 100vh; display: block; outline: none; }
body[data-state="play"] canvas#game { cursor: none; }

/* ---------------------------------------------------------------- HUD */
#hud { position: fixed; inset: 0; pointer-events: none; font-family: var(--mono); letter-spacing: 0.04em; }
#hud.hidden { display: none; }
#echo-tint { position: absolute; inset: 0; opacity: 0; background: radial-gradient(ellipse at center, rgba(34, 230, 255, 0) 45%, rgba(34, 230, 255, 0.35) 100%); mix-blend-mode: screen; }
#vignette { position: absolute; inset: 0; opacity: 0; background: radial-gradient(ellipse at center, rgba(255, 0, 40, 0) 50%, rgba(255, 0, 40, 0.55) 100%); }
#crosshair { position: absolute; left: 50%; top: 50%; --gap: 8px; width: 0; height: 0; transition: opacity 0.1s; }
#crosshair i { position: absolute; background: var(--wc); box-shadow: 0 0 4px var(--wc), 0 0 1px #000; }
#crosshair .t, #crosshair .b { width: 2px; height: 9px; left: -1px; }
#crosshair .l, #crosshair .r { height: 2px; width: 9px; top: -1px; }
#crosshair .t { top: calc(-1 * var(--gap) - 9px); } #crosshair .b { top: var(--gap); }
#crosshair .l { left: calc(-1 * var(--gap) - 9px); } #crosshair .r { left: var(--gap); }
#crosshair .dot { width: 3px; height: 3px; left: -1.5px; top: -1.5px; border-radius: 50%; }
#crosshair[data-weapon="scatter"] i:not(.dot) { width: 2px; height: 2px; }
#crosshair[data-weapon="scatter"] .t, #crosshair[data-weapon="scatter"] .b { height: 6px; }
#crosshair[data-weapon="scatter"] .l, #crosshair[data-weapon="scatter"] .r { width: 6px; }
#crosshair.ads i:not(.dot) { opacity: 0.25; }
#hitmarker { position: absolute; left: 50%; top: 50%; opacity: 0; }
#hitmarker i { position: absolute; width: 12px; height: 2px; background: #fff; box-shadow: 0 0 3px #000; }
#hitmarker i:nth-child(1) { transform: translate(6px, 6px) rotate(45deg); } #hitmarker i:nth-child(2) { transform: translate(-18px, 6px) rotate(-45deg); }
#hitmarker i:nth-child(3) { transform: translate(6px, -8px) rotate(-45deg); } #hitmarker i:nth-child(4) { transform: translate(-18px, -8px) rotate(45deg); }
#hitmarker.weak i { background: #fff27a; } #hitmarker.kill i { background: var(--red); width: 16px; } #hitmarker.blocked i { background: #8899aa; }
#reload-ring { position: absolute; left: 50%; top: 50%; width: 46px; height: 46px; transform: translate(-50%, -50%) rotate(-90deg); opacity: 0; transition: opacity 0.1s; }
#reload-ring.show { opacity: 1; }
#reload-ring circle { fill: none; stroke-width: 2.5; }
#reload-ring .bg { stroke: rgba(255, 255, 255, 0.12); }
#reload-fill { stroke: var(--wc); stroke-dasharray: 113; stroke-dashoffset: 0; filter: drop-shadow(0 0 3px var(--wc)); }
#scope { position: absolute; inset: 0; opacity: 0; transition: opacity 0.08s; background: radial-gradient(circle at center, transparent 0 34vh, rgba(0, 0, 0, 0.92) 34.3vh); }
#scope.show { opacity: 1; }
#scope .lens { position: absolute; left: 50%; top: 50%; width: 68vh; height: 68vh; transform: translate(-50%, -50%); border-radius: 50%; border: 2px solid rgba(255, 43, 214, 0.6); box-shadow: inset 0 0 60px rgba(255, 43, 214, 0.25);
  background: linear-gradient(transparent calc(50% - 0.5px), rgba(255, 43, 214, 0.7) calc(50% - 0.5px), rgba(255, 43, 214, 0.7) calc(50% + 0.5px), transparent calc(50% + 0.5px)), linear-gradient(90deg, transparent calc(50% - 0.5px), rgba(255, 43, 214, 0.7) calc(50% - 0.5px), rgba(255, 43, 214, 0.7) calc(50% + 0.5px), transparent calc(50% + 0.5px)); }
#indicators { position: absolute; left: 50%; top: 50%; }
#indicators .ind { position: absolute; left: -60px; top: -170px; width: 120px; height: 34px; transform-origin: 60px 170px; }
#indicators .ind::before { content: ""; position: absolute; inset: 0; border-top: 5px solid rgba(255, 40, 70, 0.95); border-radius: 50% 50% 0 0 / 100% 100% 0 0; transform: scale(var(--s)); filter: drop-shadow(0 0 6px rgba(255, 0, 40, 0.9)); }
#damage-layer .dmg { position: absolute; left: 0; top: 0; font: 700 15px var(--mono); color: #fff; text-shadow: 0 0 4px #000, 0 0 2px #000; white-space: nowrap; }
#damage-layer .dmg.weak { color: #fff27a; font-size: 19px; }
#damage-layer .dmg.echo { color: #8ff4ff; font-size: 13px; }
#top-left { position: absolute; left: 28px; top: 22px; }
#wave-label { font-size: 22px; font-weight: 800; color: var(--cyan); text-shadow: 0 0 10px rgba(34, 230, 255, 0.7); }
#enemy-count { margin-top: 2px; color: var(--dim); font-size: 14px; }
#intermission { margin-top: 6px; font-size: 15px; color: var(--orange); opacity: 0; }
#intermission.show { opacity: 1; }
#top-right { position: absolute; right: 28px; top: 20px; text-align: right; }
#score { font-size: 30px; font-weight: 800; text-shadow: 0 0 12px rgba(255, 255, 255, 0.35); }
#combo { color: var(--magenta); font-size: 15px; opacity: 0; transition: opacity 0.15s; position: relative; padding-bottom: 4px; }
#combo.show { opacity: 1; }
#combo::after { content: ""; position: absolute; right: 0; bottom: 0; height: 2px; width: calc(var(--t) * 100%); background: var(--magenta); box-shadow: 0 0 6px var(--magenta); }
#killfeed { margin-top: 10px; display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.kf { background: rgba(5, 8, 18, 0.65); border-right: 3px solid var(--orange); padding: 3px 10px; font-size: 13px; display: flex; gap: 10px; transition: opacity 0.4s, transform 0.4s; animation: kfIn 0.18s ease-out; }
.kf.weak { border-color: #fff27a; } .kf.echo { border-color: var(--cyan); color: #aef6ff; }
.kf b { color: #fff; } .kf i { color: #fff27a; font-style: normal; }
.kf.out { opacity: 0; transform: translateX(20px); }
@keyframes kfIn { from { opacity: 0; transform: translateX(30px); } }
#boss-bar { position: absolute; left: 50%; top: 22px; width: min(640px, 60vw); transform: translateX(-50%); opacity: 0; transition: opacity 0.4s; }
#boss-bar.show { opacity: 1; }
#boss-bar .name { text-align: center; font-weight: 800; letter-spacing: 0.3em; color: #ff8cf0; text-shadow: 0 0 10px var(--magenta); margin-bottom: 6px; font-size: 14px; }
#boss-bar .name span { color: #fff; letter-spacing: 0.1em; margin-left: 10px; }
#boss-bar .track { position: relative; height: 12px; background: rgba(40, 0, 40, 0.7); border: 1px solid rgba(255, 43, 214, 0.6); }
#boss-fill, #boss-ghost { position: absolute; left: 0; top: 0; bottom: 0; }
#boss-ghost { background: #fff; opacity: 0.5; }
#boss-fill { background: linear-gradient(90deg, #ff2bd6, #ff7cf0); box-shadow: 0 0 12px var(--magenta); }
#boss-bar.shield .track { border-color: var(--cyan); box-shadow: 0 0 14px rgba(34, 230, 255, 0.6); }
#boss-bar .track::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 33.1%, rgba(0, 0, 0, 0.8) 33.3%, transparent 33.6%, transparent 66.4%, rgba(0, 0, 0, 0.8) 66.6%, transparent 66.9%); }
#echo-timeline { position: absolute; left: 50%; bottom: 150px; width: 320px; transform: translateX(-50%); opacity: 0; transition: opacity 0.2s; text-align: center; color: var(--cyan); font-size: 12px; letter-spacing: 0.3em; }
#echo-timeline.show { opacity: 1; }
#echo-timeline .track { margin-top: 5px; height: 4px; background: rgba(34, 230, 255, 0.15); }
#echo-timeline-fill { height: 100%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
#bottom-left { position: absolute; left: 28px; bottom: 26px; width: 330px; display: flex; flex-direction: column; gap: 9px; }
.bar-row { display: flex; align-items: center; gap: 10px; }
.bar-row label { width: 44px; font-size: 12px; color: var(--dim); letter-spacing: 0.15em; }
.bar-row span { width: 110px; font-size: 14px; font-weight: 700; }
.bar { position: relative; flex: 1; height: 12px; background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.15); transform: skewX(-18deg); overflow: hidden; }
.bar > div { position: absolute; left: 0; top: 0; bottom: 0; }
#hp-ghost { background: rgba(255, 255, 255, 0.55); }
#hp-fill { background: linear-gradient(90deg, #3dff8a, #b8ffcf); box-shadow: 0 0 10px rgba(61, 255, 138, 0.8); }
#hp-fill.low { background: linear-gradient(90deg, #ff3355, #ff8a9a); box-shadow: 0 0 12px rgba(255, 51, 85, 0.9); }
#echo-fill { background: linear-gradient(90deg, #1289a8, var(--cyan)); box-shadow: 0 0 10px rgba(34, 230, 255, 0.8); }
#echo-box.ready .bar { border-color: var(--cyan); box-shadow: 0 0 12px rgba(34, 230, 255, 0.8); }
#echo-box.ready span { color: var(--cyan); animation: blink 0.9s infinite; }
#echo-box.pulse .bar { animation: pulse 0.6s ease-out; }
@keyframes blink { 50% { opacity: 0.4; } }
@keyframes pulse { 0% { transform: skewX(-18deg) scale(1.15); } 100% { transform: skewX(-18deg) scale(1); } }
#dash-pips { display: flex; gap: 8px; }
#dash-pips i { width: 38px; height: 8px; transform: skewX(-18deg); background: linear-gradient(90deg, #fff calc(var(--f) * 100%), rgba(255, 255, 255, 0.1) calc(var(--f) * 100%)); opacity: 0.8; }
#dash-pips i.full { box-shadow: 0 0 8px rgba(255, 255, 255, 0.8); opacity: 1; }
#dash-pips.pulse { animation: dashp 0.3s; }
@keyframes dashp { 0% { transform: translateX(8px); } }
#bottom-right { position: absolute; right: 28px; bottom: 24px; text-align: right; }
#weapon-name { font-size: 13px; color: var(--wc); letter-spacing: 0.2em; text-shadow: 0 0 8px var(--wc); }
#ammo { font-weight: 800; line-height: 1; margin: 4px 0 10px; }
#ammo-mag { font-size: 54px; text-shadow: 0 0 14px rgba(255, 255, 255, 0.35); }
#ammo-mag.low { color: var(--orange); } #ammo-mag.empty { color: var(--red); }
#ammo-mag.flash { animation: afl 0.5s; }
@keyframes afl { 0%, 50% { color: var(--red); transform: scale(1.2); } }
#ammo .sep { font-size: 28px; color: var(--dim); margin: 0 6px; }
#ammo-reserve { font-size: 26px; color: var(--dim); }
#weapon-slots { display: flex; gap: 6px; justify-content: flex-end; }
#weapon-slots .slot { min-width: 92px; padding: 5px 8px; background: rgba(5, 8, 18, 0.6); border: 1px solid rgba(255, 255, 255, 0.12); border-bottom: 2px solid rgba(255, 255, 255, 0.15); text-align: left; font-size: 11px; opacity: 0.6; }
#weapon-slots .slot b { color: var(--c); margin-right: 6px; }
#weapon-slots .slot em { display: block; font-style: normal; color: var(--dim); margin-top: 2px; }
#weapon-slots .slot.active { opacity: 1; border-color: var(--c); border-bottom-color: var(--c); box-shadow: 0 0 10px color-mix(in srgb, var(--c) 50%, transparent); }
#weapon-slots .slot.dry { border-bottom-color: var(--red); }
#banner { position: absolute; left: 0; right: 0; top: 24%; text-align: center; opacity: 0; transform: translateY(-10px); transition: opacity 0.3s, transform 0.3s; }
#banner.show { opacity: 1; transform: none; }
#banner-title { font: 900 56px var(--font); letter-spacing: 0.25em; color: #fff; text-shadow: 0 0 22px var(--cyan), 0 0 4px var(--cyan); }
#banner-sub { margin-top: 8px; font-size: 16px; color: #bfe8ff; letter-spacing: 0.1em; }
#banner.boss #banner-title { text-shadow: 0 0 24px var(--magenta), 0 0 4px var(--magenta); color: #ffd6f8; }
#banner.clear #banner-title { text-shadow: 0 0 22px var(--lime); }
#toast { position: absolute; left: 50%; bottom: 190px; transform: translateX(-50%); padding: 6px 18px; background: rgba(5, 8, 18, 0.75); border: 1px solid rgba(255, 255, 255, 0.2); font-size: 14px; opacity: 0; transition: opacity 0.2s; white-space: nowrap; }
#toast.show { opacity: 1; }
#toast.cyan { border-color: var(--cyan); color: #aef6ff; } #toast.green { border-color: #3dff8a; color: #c2ffd9; }
#toast.orange { border-color: var(--orange); color: #ffd2a8; } #toast.red { border-color: var(--red); color: #ffb3c0; }
#lowhp { position: absolute; left: 50%; top: 62%; transform: translateX(-50%); color: var(--red); font-weight: 800; letter-spacing: 0.4em; opacity: 0; font-size: 13px; }
#lowhp.show { opacity: 1; animation: blink 0.7s infinite; }
#lock-hint { position: absolute; left: 50%; bottom: 8px; transform: translateX(-50%); font-size: 12px; color: #ffd2a8; opacity: 0; transition: opacity 0.3s; background: rgba(5, 8, 18, 0.6); padding: 3px 12px; }
#lock-hint.show { opacity: 0.85; }

/* ---------------------------------------------------------------- screens */
.screen { position: fixed; inset: 0; display: none; align-items: center; justify-content: center; background: radial-gradient(ellipse at center, rgba(4, 6, 16, 0.55), rgba(2, 3, 8, 0.9)); z-index: 5; }
.screen.show { display: flex; }
#screen-menu { background: linear-gradient(90deg, rgba(2, 3, 10, 0.92) 0%, rgba(2, 3, 10, 0.55) 45%, rgba(2, 3, 10, 0.1) 100%); justify-content: flex-start; }
.menu-wrap { margin-left: 8vw; display: flex; flex-direction: column; gap: 14px; width: min(460px, 86vw); }
.logo { font: 900 76px/0.9 var(--font); letter-spacing: 0.08em; }
.logo .p { color: #fff; text-shadow: 0 0 18px rgba(34, 230, 255, 0.8); display: block; }
.logo .e { color: transparent; -webkit-text-stroke: 2px var(--cyan); text-shadow: 0 0 22px rgba(34, 230, 255, 0.6); display: block; position: relative; }
.logo .e::after { content: "ECHO"; position: absolute; left: 10px; top: 6px; color: rgba(34, 230, 255, 0.18); -webkit-text-stroke: 0; }
.tagline { color: #9fc7e8; letter-spacing: 0.12em; margin-bottom: 14px; }
.diffs { display: flex; gap: 8px; }
.diffs button { flex: 1; }
.diffs button.active { border-color: var(--magenta); color: #fff; box-shadow: 0 0 12px rgba(255, 43, 214, 0.5), inset 0 0 12px rgba(255, 43, 214, 0.25); }
.row { display: flex; gap: 10px; }
.row button { flex: 1; }
#menu-best { color: var(--dim); font-size: 13px; font-family: var(--mono); }
.credits { margin-top: 20px; color: #4d5d7a; font-size: 12px; }
button { font: 600 15px var(--font); letter-spacing: 0.1em; color: #cfe6ff; background: rgba(10, 16, 34, 0.75); border: 1px solid var(--line); padding: 12px 18px; cursor: pointer; transition: all 0.12s; clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%); }
button:hover { background: rgba(34, 230, 255, 0.14); color: #fff; border-color: var(--cyan); }
button.primary { font-size: 19px; padding: 16px; background: linear-gradient(90deg, rgba(34, 230, 255, 0.28), rgba(255, 43, 214, 0.22)); border-color: var(--cyan); color: #fff; text-shadow: 0 0 8px var(--cyan); }
button.primary small { font-size: 11px; opacity: 0.6; margin-left: 10px; }
.panel { background: var(--panel); border: 1px solid var(--line); padding: 28px 34px; min-width: 360px; max-width: 92vw; max-height: 90vh; overflow: auto; display: flex; flex-direction: column; gap: 12px; box-shadow: 0 0 40px rgba(34, 230, 255, 0.12); }
.panel.wide { width: min(1080px, 94vw); }
.panel h2 { margin: 0 0 6px; letter-spacing: 0.2em; color: #fff; text-shadow: 0 0 12px var(--cyan); }
.panel h3 { margin: 14px 0 6px; color: var(--cyan); font-size: 15px; letter-spacing: 0.15em; }
.panel p { color: #b8cbe4; line-height: 1.65; margin: 6px 0; font-size: 14px; }
.hint { color: var(--dim) !important; font-size: 12px !important; text-align: center; }
.howto-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.howto-grid ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: #c8d8ee; }
.howto-grid .weapons li, .howto-grid .enemies li { border-left: 3px solid var(--c); padding-left: 10px; }
.howto-grid li b { color: var(--c, #fff); margin-right: 6px; }
kbd { font: 600 12px var(--mono); background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.25); border-bottom-width: 2px; padding: 1px 6px; border-radius: 3px; color: #fff; }
.set { display: grid; grid-template-columns: 140px 1fr 60px; align-items: center; gap: 12px; font-size: 14px; color: #c8d8ee; }
.set.check { grid-template-columns: 22px 1fr; }
.set output { font-family: var(--mono); color: var(--cyan); text-align: right; }
.set select { grid-column: span 2; background: #0b1224; color: #fff; border: 1px solid var(--line); padding: 6px; font: inherit; }
input[type="range"] { accent-color: var(--cyan); width: 100%; }
input[type="checkbox"] { accent-color: var(--cyan); width: 18px; height: 18px; }
.panel.upgrade { width: min(980px, 94vw); align-items: center; }
#upgrade-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; width: 100%; margin-top: 6px; }
.card { clip-path: none; position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 26px 18px 20px; min-height: 250px; text-align: center; background: linear-gradient(180deg, rgba(34, 230, 255, 0.08), rgba(10, 14, 30, 0.9)); border: 1px solid var(--line); animation: cardIn 0.35s backwards; }
.card:nth-child(2) { animation-delay: 0.07s; } .card:nth-child(3) { animation-delay: 0.14s; }
@keyframes cardIn { from { opacity: 0; transform: translateY(20px); } }
.card:hover { transform: translateY(-6px); border-color: var(--magenta); box-shadow: 0 0 24px rgba(255, 43, 214, 0.35); }
.card .icon { font-size: 44px; color: var(--cyan); text-shadow: 0 0 16px var(--cyan); }
.card h3 { margin: 4px 0 0; font-size: 20px; color: #fff; letter-spacing: 0.1em; }
.card h4 { margin: 0; font: 600 11px var(--mono); color: var(--magenta); letter-spacing: 0.25em; }
.card p { margin: 8px 0; color: #b8cbe4; font-size: 14px; line-height: 1.5; letter-spacing: 0; font-weight: 400; }
.card small { color: var(--cyan); letter-spacing: 0.3em; margin-top: auto; }
.card kbd { position: absolute; top: 10px; left: 10px; }
.panel.results { width: min(620px, 94vw); align-items: stretch; }
#results-title { font-size: 40px; text-align: center; }
#results-title.win { text-shadow: 0 0 20px var(--lime); } #results-title.lose { text-shadow: 0 0 20px var(--red); color: #ffd0d8; }
#results-sub { text-align: center; color: #9fc7e8; }
#results-rank { align-self: center; font: 900 84px/1 var(--font); color: #fff; text-shadow: 0 0 24px var(--magenta); margin: 6px 0; }
#results-rank[data-rank="S"] { color: #ffe27a; text-shadow: 0 0 26px #ffc21f; }
#results-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 22px; font-family: var(--mono); font-size: 14px; }
#results-stats div { display: flex; justify-content: space-between; border-bottom: 1px solid rgba(255, 255, 255, 0.07); padding: 4px 0; }
#results-stats span { color: var(--dim); }
#results-upgrades { color: var(--cyan); font-size: 13px; text-align: center; margin: 8px 0; line-height: 1.7; }
#webgl-error { display: none; position: fixed; inset: 0; align-items: center; justify-content: center; padding: 40px; text-align: center; font-size: 18px; background: #05060d; z-index: 20; }
#webgl-error.show { display: flex; }
@media (max-width: 900px) { .logo { font-size: 54px; } #banner-title { font-size: 36px; } }
@media (max-width: 700px) { .howto-grid, #upgrade-cards { grid-template-columns: 1fr; } }
@media (max-height: 620px) {
  .panel { padding: 16px 22px; gap: 8px; }
  .card { min-height: 0; padding: 16px 12px 12px; gap: 3px; }
  .card .icon { font-size: 28px; }
  .card h3 { font-size: 16px; }
  .card p { margin: 4px 0; font-size: 13px; }
  #results-title { font-size: 28px; }
  #results-rank { font-size: 50px; margin: 0; }
  #results-stats { font-size: 13px; gap: 2px 18px; }
  #results-stats div { padding: 2px 0; }
  #banner-title { font-size: 34px; }
  #toast { bottom: 26%; }
  #echo-timeline { bottom: 32%; }
}