/* ============================================================
   SUNBII WORLD — HUD cho thế giới physics chơi được
   Nền cát sáng #E8DEC8 → HUD dùng dark-glass #263238/85 để nổi.
   Không cuộn trang: body fixed 100vw×100vh (luật 1 của skill).
   ============================================================ */

:root {
  --sand: #e8dec8;
  --ink: #263238;
  --ink-soft: #546e7a;
  --paper: #fffdf8;
  --red: #ff471a;
  --gold: #fbc02d;
  --glass: rgba(38, 50, 56, 0.88);
  --glass-line: rgba(255, 253, 248, 0.16);
  --font: "Be Vietnam Pro", sans-serif;
  --mono: "Space Grotesk", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100vw; height: 100vh;
  overflow: hidden;               /* Luật 1: KHÓA THANH CUỘN */
  font-family: var(--font);
  background: var(--sand);
  color: var(--ink);
  overscroll-behavior: none;
  touch-action: none;
}

#world, #world canvas {
  position: fixed; inset: 0;
  width: 100vw; height: 100vh;
  display: block;
  cursor: grab;               /* kéo để xoay camera quanh xe */
}
#world canvas:active { cursor: grabbing; }

button { font-family: inherit; cursor: pointer; }
a { color: inherit; }

/* ---------- Loading ---------- */
.loader {
  position: fixed; inset: 0; z-index: 120;
  background: var(--sand);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.9rem;
  transition: opacity 0.6s ease, visibility 0.6s;
}
.loader.is-done { opacity: 0; visibility: hidden; }
.loader-brand { font-size: clamp(2rem, 6vw, 3.4rem); font-weight: 900; letter-spacing: -0.02em; color: var(--ink); }
.loader-brand span { color: var(--red); }
.loader-sub { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.4em; color: var(--ink-soft); }
.loader-bar { width: min(300px, 70vw); height: 3px; background: rgba(38, 50, 56, 0.15); overflow: hidden; border-radius: 3px; }
.loader-bar span {
  display: block; height: 100%; width: 40%;
  background: linear-gradient(90deg, transparent, var(--red), var(--gold), transparent);
  animation: shimmer 1.1s linear infinite;
}
@keyframes shimmer { from { transform: translateX(-100%); } to { transform: translateX(320%); } }
.loader-tip { font-size: 0.8rem; color: var(--ink-soft); }
.loader-tip b { color: var(--red); }

/* ---------- Top HUD ---------- */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  display: flex; align-items: flex-start; justify-content: space-between;
  padding: 1rem clamp(0.9rem, 2.5vw, 1.8rem);
  pointer-events: none;
  gap: 1rem;
}
.topbar > * { pointer-events: auto; }

.brand {
  font-weight: 900; font-size: 1.25rem; letter-spacing: -0.01em;
  color: var(--ink); background: var(--glass); color: var(--paper);
  padding: 0.55rem 1.1rem; border-radius: 12px;
  text-decoration: none; backdrop-filter: blur(8px);
  border: 1px solid var(--glass-line);
  white-space: nowrap;
}
.brand i { color: var(--gold); font-style: normal; padding-inline: 0.15em; }

.teleport { display: flex; gap: 0.45rem; flex-wrap: wrap; justify-content: flex-end; max-width: 58vw; }
.topbar-right { display: flex; align-items: center; gap: 0.45rem; pointer-events: auto; }
.audio-btn {
  width: 42px; height: 42px; border-radius: 12px;
  background: var(--glass); color: var(--paper);
  border: 1px solid var(--glass-line);
  backdrop-filter: blur(8px);
  font-size: 1rem;
  transition: background 0.25s, transform 0.25s var(--ease-out, cubic-bezier(.22,1,.36,1));
}
.audio-btn:hover { background: var(--gold); color: var(--ink); transform: translateY(-2px); }
.audio-btn.is-muted { opacity: 0.55; }
.tp-btn {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em;
  background: var(--glass); color: var(--paper);
  border: 1px solid var(--glass-line); border-radius: 999px;
  padding: 0.55rem 1rem; backdrop-filter: blur(8px);
  transition: background 0.25s, border-color 0.25s, transform 0.25s var(--ease-out, cubic-bezier(.22,1,.36,1));
  white-space: nowrap;
}
.tp-btn b { color: var(--gold); margin-right: 0.35em; }
.tp-btn:hover { background: var(--red); border-color: var(--red); transform: translateY(-2px); color: #fff; }
.tp-btn:hover b { color: #fff; }

/* ---------- Keycap guide ---------- */
.keycaps {
  position: fixed; left: 1.2rem; bottom: 1.2rem; z-index: 55;
  display: flex; flex-direction: column; gap: 0.35rem;
  pointer-events: none; user-select: none;
}
.kc-row { display: flex; gap: 0.35rem; justify-content: center; }
.kc {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; height: 42px; padding: 0 0.7rem;
  background: var(--glass); color: var(--paper);
  border: 1px solid var(--glass-line); border-radius: 9px;
  font-family: var(--mono); font-size: 0.85rem; font-weight: 700;
  backdrop-filter: blur(6px);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.35);
  transition: background 0.12s, box-shadow 0.12s, transform 0.12s;
}
.kc-wide { font-size: 0.62rem; letter-spacing: 0.14em; min-width: 130px; }
.kc.is-down {
  background: var(--gold); color: var(--ink);
  transform: translateY(3px);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0.3);
}
@media (max-width: 900px) { .keycaps { display: none; } }

/* Cảm ứng (máy tính bảng/điện thoại lớn) cũng có d-pad, không phụ thuộc width */
@media (pointer: coarse) {
  .keycaps { display: none; }
  .dpad { display: grid; }
}

/* ---------- Mobile D-pad ---------- */
.dpad {
  position: fixed; right: 1.1rem; bottom: 1.1rem; z-index: 70;
  display: none;
  grid-template-areas: ". up ." "left down right" ". boost .";
  grid-template-columns: repeat(3, 56px);
  grid-auto-rows: 56px;
  gap: 0.4rem;
}
.dp {
  grid-area: auto;
  border: 1px solid var(--glass-line); border-radius: 14px;
  background: var(--glass); color: var(--paper);
  font-size: 1.1rem; font-weight: 700;
  backdrop-filter: blur(6px);
  touch-action: none; user-select: none;
  transition: background 0.12s;
}
.dp.is-down { background: var(--gold); color: var(--ink); }
.dp-boost { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; color: var(--gold); }
.dp-boost.is-down { color: var(--ink); }
@media (max-width: 900px) { .dpad { display: grid; } }

/* ---------- Minimap ---------- */
.minimap {
  position: fixed; right: 1.1rem; bottom: 1.2rem; z-index: 55;
  width: 150px; height: 150px;
  border-radius: 14px;
  border: 1px solid var(--glass-line);
  box-shadow: 0 14px 40px -18px rgba(0, 0, 0, 0.5);
}
@media (max-width: 900px) {
  .minimap { width: 108px; height: 108px; right: auto; left: 1.1rem; top: auto; bottom: 11.5rem; }
}

/* ---------- Station drawer ---------- */
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 80;
  width: min(380px, 92vw);
  background: var(--glass);
  border-left: 1px solid var(--glass-line);
  backdrop-filter: blur(16px);
  color: var(--paper);
  padding: 3.6rem 1.8rem 1.6rem;
  transform: translateX(105%);
  transition: transform 0.45s var(--ease-out, cubic-bezier(.22,1,.36,1));
  overflow-y: auto;
}
.drawer.is-open { transform: translateX(0); }
.drawer-close {
  position: absolute; top: 1.1rem; right: 1.1rem;
  width: 38px; height: 38px; border-radius: 50%;
  background: rgba(255, 253, 248, 0.1); border: 1px solid var(--glass-line);
  color: var(--paper); font-size: 0.9rem;
  transition: background 0.25s, transform 0.25s;
}
.drawer-close:hover { background: var(--red); transform: rotate(90deg); }
.drawer-ch {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.34em;
  color: var(--gold); text-transform: uppercase; margin-bottom: 0.7rem;
}
.drawer-name { font-size: 1.5rem; font-weight: 900; line-height: 1.15; margin-bottom: 0.3rem; }
.drawer-sub { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; color: var(--gold); margin-bottom: 1rem; text-transform: uppercase; }
.drawer-desc { font-size: 0.9rem; line-height: 1.7; color: rgba(255, 253, 248, 0.78); margin-bottom: 1.3rem; }
.drawer-specs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; margin-bottom: 1.4rem; }
.drawer-specs .spec {
  background: rgba(255, 253, 248, 0.07); border: 1px solid var(--glass-line);
  border-radius: 10px; padding: 0.6rem 0.5rem; text-align: center;
}
.drawer-specs .spec b { display: block; font-size: 0.95rem; color: var(--gold); margin-bottom: 0.15rem; }
.drawer-specs .spec span { font-size: 0.62rem; color: rgba(255, 253, 248, 0.6); }
.drawer-cta {
  display: flex; align-items: center; justify-content: center;
  padding: 0.95rem 1.4rem; border-radius: 12px;
  background: linear-gradient(95deg, var(--red), #ff7a4d);
  color: #fff; font-weight: 800; font-size: 0.95rem;
  text-decoration: none; letter-spacing: 0.02em;
  transition: transform 0.3s var(--ease-out, cubic-bezier(.22,1,.36,1)), box-shadow 0.3s;
}
.drawer-cta:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -14px rgba(255, 71, 26, 0.7); }
.drawer-hint { margin-top: 1rem; font-size: 0.68rem; color: rgba(255, 253, 248, 0.45); text-align: center; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 1.3rem; transform: translateX(-50%);
  z-index: 65; max-width: min(640px, 92vw);
  background: var(--glass); color: var(--paper);
  border: 1px solid var(--glass-line); border-radius: 14px;
  padding: 0.8rem 1.3rem; font-size: 0.85rem; text-align: center;
  backdrop-filter: blur(8px);
  transition: opacity 0.6s, transform 0.6s;
}
.toast.is-hidden { opacity: 0; transform: translateX(-50%) translateY(16px); pointer-events: none; }
.toast b { color: var(--gold); }
@media (max-width: 900px) { .toast { bottom: auto; top: 5.2rem; font-size: 0.72rem; } }

/* ---------- Responsive top ---------- */
@media (max-width: 900px) {
  .teleport { max-width: 70vw; }
  .tp-btn { padding: 0.45rem 0.75rem; font-size: 0.62rem; }
  .brand { font-size: 1rem; padding: 0.45rem 0.85rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .loader-bar span { animation: none; width: 100%; }
}