/* ====== Base ====== */
:root{
  --ui-yellow: #ffd84d;
  --ui-orange: #ff9a2a;
  --ui-red: #ff3b00;
}

html, body {
  margin: 0;
  height: 100%;
  background: #000;
  overflow: hidden;
  font-family: sans-serif;
  color: #fff;
}

/* ใส่ wrapper เพื่อเขย่าจอได้เนียนกว่า */
#shake {
  position: relative;
  width: 100%;
  height: 100%;
  transform: translate3d(0,0,0);
  will-change: transform;
  transition: transform 0.06s ease;
}

/* ====== Start Screen ====== */
#start-screen {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 2000;
  background: radial-gradient(1200px 800px at 50% 50%, rgba(255,255,255,0.04), transparent 60%);
  padding: 24px;
}
.start-inner{ text-align:center; max-width: 780px; }

#start-title {
  font-size: 64px;
  font-weight: 800;
  animation: rainbowBlink 0.2s infinite alternate;
  margin-bottom: 22px;
  text-shadow: 0 0 20px #fff, 0 0 30px cyan;
}
@keyframes rainbowBlink {
  0%   { color: red;     text-shadow: 0 0 10px red;     opacity: 1; }
  20%  { color: orange;  text-shadow: 0 0 10px orange;  opacity: 0.8; }
  40%  { color: yellow;  text-shadow: 0 0 10px yellow;  opacity: 0.6; }
  60%  { color: lime;    text-shadow: 0 0 10px lime;    opacity: 0.8; }
  80%  { color: cyan;    text-shadow: 0 0 10px cyan;    opacity: 1; }
  100% { color: magenta; text-shadow: 0 0 10px magenta; opacity: 0.6; }
}

/* ===== วิธีเล่น + ลิงก์ GitHub ===== */
.howto {
  text-align: left;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 0 auto 18px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
}
.howto h3{
  margin: 0 0 10px 0;
  font-size: 20px;
  letter-spacing: .2px;
  color: var(--ui-yellow);
  text-shadow: 0 0 8px rgba(255,216,77,.35);
}
.howto ul{
  margin: 0 0 6px 18px;
  padding: 0;
  line-height: 1.6;
  font-size: 15px;
}
.howto .tip{
  font-size: 13px;
  opacity: .85;
  margin-top: 8px;
}
.gh-link{
  display: inline-block;
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background: linear-gradient(180deg, #1f1f1f, #121212);
  border: 1px solid rgba(255,255,255,0.12);
  text-decoration: none;
  color: #fff;
  font-weight: 700;
}
.gh-link:hover{ filter: brightness(1.1); }

#start-btn {
  padding: 18px 36px;
  background: linear-gradient(180deg, #ffe66d, #ffcf2d);
  color: #000;
  font-size: 22px;
  font-weight: 800;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(255, 208, 0, 0.35);
}
#start-btn:active { transform: translateY(1px); }

/* ====== HUD ====== */
#score {
  position: fixed;
  top: 10px;
  left: 10px;
  font-size: 20px;
  z-index: 1000;
  display: none;
  background: rgba(0,0,0,0.4);
  padding: 6px 10px;
  border-radius: 8px;
  backdrop-filter: blur(2px);
}

/* ====== Target ====== */
.img-wrapper {
  position: absolute;
  padding: 5px;
  animation: flashyBorder 0.2s infinite alternate;
  border: 3px dashed var(--ui-yellow);
  border-radius: 8px;
  user-select: none;
}
.img {
  width: 120px;
  height: auto;
  display: block;
  cursor: crosshair;
  filter: drop-shadow(0 6px 18px rgba(255, 255, 255, 0.06));
}
@keyframes flashyBorder {
  0% { border-color: var(--ui-yellow); box-shadow: 0 0 10px red, 0 0 20px orange; }
  100%{ border-color: red;             box-shadow: 0 0 10px lime, 0 0 20px yellow; }
}

/* ====== Muzzle Flash (สมจริงขึ้น) ====== */
.muzzle {
  position: absolute;
  pointer-events: none;
  width: 160px;
  height: 160px;
  transform: translate(-50%, -50%);
  z-index: 1200;
  will-change: transform, opacity, filter;
  animation: muzzlePop 0.16s ease-out forwards;
  filter: blur(0.4px) contrast(1.2);
}
.m-core {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%,
      rgba(255,255,220,0.95) 0%,
      rgba(255,200,80,0.85) 40%,
      rgba(255,120,10,0.65) 70%,
      rgba(255,60,0,0.0) 100%);
  box-shadow:
    0 0 28px 14px rgba(255,210,120,0.95),
    0 0 64px 28px rgba(255,120,0,0.55);
}
.m-cone {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 220px;
  height: 80px;
  transform: translate(0,-50%) rotate(8deg);
  transform-origin: left center;
  background:
    radial-gradient(70% 50% at 0% 50%,
      rgba(255,245,200,0.9) 0%,
      rgba(255,180,60,0.7) 60%,
      rgba(255,90,20,0.0) 100%);
  filter: blur(1px);
  border-top-right-radius: 100px 40px;
  border-bottom-right-radius: 100px 40px;
  clip-path: polygon(0% 0%, 100% 35%, 100% 65%, 0% 100%);
}
@keyframes muzzlePop {
  0%   { transform: translate(-50%,-50%) scale(0.8) rotate(0deg);   opacity: 1; }
  50%  { transform: translate(-50%,-50%) scale(1.5) rotate(12deg);  opacity: 0.9; }
  100% { transform: translate(-50%,-50%) scale(2.2) rotate(-8deg);  opacity: 0; }
}

/* ====== Sparks ====== */
.spark {
  position: absolute;
  width: 4px;
  height: 4px;
  background: radial-gradient(circle, #ffd37a, #ff8b2a 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1100;
  will-change: transform, opacity;
  box-shadow: 0 0 8px 2px rgba(255,180,80,0.8);
}

/* ====== Screen Glow (แฟลชทั้งจอ) ====== */
.screen-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1005;
  background: radial-gradient(circle at var(--gx,50%) var(--gy,50%),
    rgba(255,210,160,0.35), rgba(255,120,0,0.0) 60%);
  animation: boomFlash 0.18s ease-out forwards;
}
@keyframes boomFlash {
  0%   { opacity: 1; }
  100% { opacity: 0; }
}

audio { display: none; }

/* เลย์เอาต์บนจอเล็ก */
@media (max-width: 520px){
  #start-title{ font-size: 44px; }
  .howto{ font-size: 14px; }
}