:root {
  --sea-deep: #0a2a3a; --sea-mid: #135a72; --foam: #b8e4f0;
  --accent: #ff6b35; --accent-hot: #ff9f1c; --danger: #e63946; --ok: #2ec4b6;
  --ink: #06202c; --panel: rgba(6, 32, 44, 0.78);
  --font-display: "Bebas Neue", Impact, sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--sea-deep); color: #e8f4f8; font-family: var(--font-body); }
#app { position: relative; width: 100%; height: 100%; }
#game { display: block; width: 100%; height: 100%; cursor: crosshair; background: var(--sea-deep); }
.screen { position: absolute; inset: 0; display: grid; place-items: center; z-index: 2; transition: opacity .35s ease, visibility .35s ease; overflow: auto; }
.screen.hidden, .hud.hidden, .hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.screen.active { opacity: 1; visibility: visible; }
.menu-atmosphere {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 90% 70% at 50% 110%, rgba(31,138,173,.55), transparent 55%),
    radial-gradient(ellipse 60% 40% at 70% 20%, rgba(255,159,28,.12), transparent 50%),
    linear-gradient(180deg, #061820 0%, var(--sea-deep) 40%, var(--sea-mid) 100%);
  animation: tide 12s ease-in-out infinite alternate;
}
.menu-atmosphere::after {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 28px, rgba(184,228,240,.03) 28px, rgba(184,228,240,.03) 30px);
  animation: drift 18s linear infinite;
}
@keyframes tide { from { transform: scale(1); } to { transform: scale(1.04); } }
@keyframes drift { from { transform: translateY(0); } to { transform: translateY(-30px); } }
.menu-content { position: relative; text-align: center; padding: 2rem 1.25rem; max-width: 42rem; }
.brand {
  margin: 0; font-family: var(--font-display); font-size: clamp(4.5rem, 16vw, 8.5rem);
  letter-spacing: .04em; line-height: .9; color: var(--foam);
  text-shadow: 0 0 40px rgba(31,138,173,.6), 0 8px 0 rgba(6,32,44,.45);
  animation: brand-bob 4s ease-in-out infinite;
}
@keyframes brand-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
.tagline { margin: 1.1rem 0 .75rem; font-size: clamp(1rem, 2.4vw, 1.25rem); color: rgba(232,244,248,.85); }
.coin-line, .equip-line { margin: .25rem 0; color: rgba(184,228,240,.8); font-size: .95rem; }
.controls-hint { margin: 1.25rem 0 0; font-size: .85rem; letter-spacing: .03em; color: rgba(184,228,240,.65); }
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; margin-top: 1rem; }
.btn { appearance: none; border: none; font-family: var(--font-body); font-weight: 700; font-size: 1.05rem; letter-spacing: .03em; padding: .85rem 1.6rem; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.btn:hover:not(:disabled) { transform: translateY(-2px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: linear-gradient(180deg, var(--accent-hot), var(--accent)); color: var(--ink); box-shadow: 0 6px 0 #a33c14; }
.btn.ghost { background: transparent; color: var(--foam); border: 2px solid rgba(184,228,240,.45); }

.mode-picker {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: .5rem; margin: 1rem 0 .25rem; text-align: left;
}
.mode-btn {
  appearance: none; border: 1px solid rgba(184,228,240,.2); background: rgba(6,32,44,.55);
  color: var(--foam); padding: .65rem .75rem; cursor: pointer; text-align: left;
  transition: border-color .15s ease, background .15s ease;
}
.mode-btn strong { display: block; font-size: .95rem; margin-bottom: .15rem; }
.mode-btn span { display: block; font-size: .75rem; color: rgba(184,228,240,.65); }
.mode-btn.active, .mode-btn:hover {
  border-color: var(--accent-hot); background: rgba(255,107,53,.12);
}

.hud { position: absolute; top: 0; left: 0; right: 0; z-index: 3; display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; padding: .85rem 1.1rem; pointer-events: none; }
.hud-left, .hud-right, .hud-center { background: var(--panel); backdrop-filter: blur(6px); padding: .55rem .85rem; border: 1px solid rgba(184,228,240,.12); }
.hud-left { min-width: 12rem; flex: 0 1 16rem; }
.hud-right { display: flex; gap: 1rem; flex-wrap: wrap; }
.hud-label { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: rgba(184,228,240,.7); margin-bottom: .2rem; }
.hud-stat .hud-label { display: inline; margin-right: .35rem; }
.hud-weapon { display: block; margin-top: .4rem; font-size: .85rem; color: rgba(232,244,248,.9); }
.hp-bar { height: 10px; background: rgba(6,32,44,.8); border: 1px solid rgba(184,228,240,.2); overflow: hidden; }
.hp-fill { height: 100%; width: 100%; background: linear-gradient(90deg, var(--ok), #7ddea8); transition: width .12s ease; }
.hp-fill.low { background: linear-gradient(90deg, var(--danger), #ff8a5b); }
.timer { font-family: var(--font-display); font-size: 1.75rem; letter-spacing: .06em; color: var(--foam); }
.weapon-slots { display: flex; gap: .35rem; margin-top: .45rem; flex-wrap: wrap; }
.slot-chip {
  min-width: 1.5rem; height: 1.5rem; padding: 0 .35rem;
  border: 2px solid rgba(184,228,240,.35); display: inline-grid; place-items: center;
  font-size: .75rem; font-weight: 700; color: var(--foam); opacity: .65;
}
.slot-chip.active { opacity: 1; background: rgba(255,159,28,.2); }

.reload-wrap { margin-top: 0.35rem; }
.reload-wrap.hidden { display: none; }
.reload-bar {
  width: 140px; height: 6px; margin-top: 0.2rem;
  background: rgba(0,0,0,0.35); overflow: hidden;
}
.reload-fill {
  height: 100%; width: 100%;
  background: #f0c14b;
  transition: width 0.08s linear;
}
.reload-fill.reloading { background: #5ec8ff; }

.shop-panel {
  width: min(920px, 94vw); max-height: min(88vh, 900px);
  background: var(--panel); backdrop-filter: blur(12px);
  border: 1px solid rgba(184,228,240,.18); padding: 1.25rem 1.35rem 1rem;
  display: flex; flex-direction: column; gap: .75rem;
}
.shop-header { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; }
.shop-title { margin: 0; font-family: var(--font-display); font-size: 2.4rem; letter-spacing: .05em; color: var(--foam); }
.shop-sub { margin: .25rem 0 0; color: rgba(184,228,240,.7); font-size: .9rem; }
.shop-coins { font-size: 1rem; color: var(--accent-hot); white-space: nowrap; }
.shop-tabs { display: flex; flex-wrap: wrap; gap: .4rem; }
.shop-tab {
  appearance: none; border: 1px solid rgba(184,228,240,.25); background: transparent;
  color: var(--foam); padding: .45rem .85rem; cursor: pointer; font-weight: 700; font-size: .9rem;
}
.shop-tab.active { background: rgba(255,159,28,.18); border-color: var(--accent-hot); color: #ffe0a8; }
.shop-list { overflow: auto; flex: 1; min-height: 12rem; padding-right: .25rem; }
.shop-toast { min-height: 1.25rem; margin: 0; color: var(--accent-hot); font-size: .9rem; }
.rarity-block { margin-bottom: 1rem; }
.rarity-block h3 { margin: 0 0 .5rem; font-size: 1rem; letter-spacing: .06em; text-transform: uppercase; }
.weapon-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .65rem; }
.weapon-card {
  border: 1px solid rgba(184,228,240,.16); background: rgba(4,22,30,.55);
  padding: .75rem; display: flex; flex-direction: column; gap: .3rem;
}
.weapon-card.owned { border-color: rgba(62,207,142,.35); }
.weapon-card.equipped { border-color: var(--accent-hot); box-shadow: inset 0 0 0 1px rgba(255,159,28,.25); }
.w-rarity { font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; }
.w-name { font-weight: 700; font-size: 1.05rem; }
.w-desc, .w-stats { font-size: .8rem; color: rgba(184,228,240,.72); line-height: 1.35; }
.w-price { font-size: .85rem; color: #f0c14b; margin-top: .15rem; }
.w-actions { display: flex; gap: .4rem; margin-top: .35rem; }
.w-actions .btn { padding: .45rem .8rem; font-size: .85rem; box-shadow: none; }
.ship-swatch { width: 100%; height: 8px; margin: .15rem 0; }

.end-panel { background: var(--panel); backdrop-filter: blur(10px); border: 1px solid rgba(184,228,240,.18); padding: 2.25rem 2.5rem; text-align: center; max-width: 26rem; animation: end-rise .4s ease; }
@keyframes end-rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.end-title { margin: 0; font-family: var(--font-display); font-size: clamp(2.8rem, 8vw, 4rem); letter-spacing: .05em; color: var(--accent-hot); }
.end-title.defeat { color: var(--danger); }
.end-message { margin: .6rem 0 .4rem; color: rgba(232,244,248,.88); }
.end-score { margin: 0 0 .4rem; color: var(--foam); }
.end-score:last-of-type { margin-bottom: 1.5rem; }

@media (max-width: 640px) {
  .hud { flex-wrap: wrap; padding: .55rem; }
  .hud-center { order: -1; width: 100%; text-align: center; }
  .shop-panel { padding: 1rem; }
}