/* =========================
   COIN FLIP + SIDEBAR CSS
   (moved from inline <style> in HTML)
   ========================= */

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

html, body {
  height: 100%;
  font-family: 'Poppins', sans-serif;
  color: #f7f7f7;
  overflow-x: hidden;
  line-height: 1.4;

  /* Black water motion background (same as before) */
  background: linear-gradient(270deg, #1c1c1c, #2a2a2a, #1c1c1c);
  background-size: 600% 600%;
  animation: waterflow 20s ease infinite;
  -webkit-animation: waterflow 20s ease infinite;
  background-attachment: fixed;

  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes waterflow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@media (max-width: 768px) {
  body { background-attachment: scroll; }
}

/* -------------------------
   Sidebar (the "good" sidebar code)
   ------------------------- */
.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  top: 0; left: 0;
  background: rgba(17, 17, 17, 0.4); /* blurred dark */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow-x: hidden;
  transition: 0.3s;
  padding-top: 60px;
  z-index: 1000;
}

.sidebar a {
  padding: 12px 25px;
  text-decoration: none;
  font-size: 18px;
  color: #ccc;
  display: block;
  transition: 0.3s;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.sidebar a:hover {
  color: white;
  background: rgba(255, 255, 255, 0.05);
}

.sidebar.open {
  width: 250px;
}

/* Hamburger (three lines) */
.hamburger {
  position: fixed;
  top: 20px;
  left: 20px;
  cursor: pointer;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 30px;
  height: 3px;
  margin: 6px;
  background: white;
  transition: 0.3s;
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* -------------------------
   Coin flip UI (moved from inline)
   ------------------------- */
.container {
  width: 100%;
  max-width: 480px;
  padding: 30px;
  border-radius: 25px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(12px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.container h1 {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
}

/* Coin */
.coin-wrap {
  perspective: 1200px;
  width: 160px;
  height: 160px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.coin {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  position: relative;
  transform-style: preserve-3d;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 1.2s cubic-bezier(.2,.9,.3,1);
  box-shadow: 0 12px 30px rgba(0,0,0,0.55), inset 0 -8px 18px rgba(0,0,0,0.12);
  background: radial-gradient(circle at 30% 30%, #ffd86b, #e6b73f 60%, #a67b22 120%);
}

.coin::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(255,255,255,0.15) 0%, rgba(0,0,0,0.25) 80%);
  box-shadow: inset 0 4px 12px rgba(0,0,0,0.3);
  z-index: 5;
}

.face {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  font-size: 3rem;
  font-weight: 700;
  backface-visibility: hidden;
  z-index: 10;
  transform-style: preserve-3d;
}

.face.front { transform: translateZ(6px); }
.face.back { transform: rotateX(180deg) translateZ(6px); }

/* Controls */
.controls {
  display: flex;
  gap: 12px;
}

button {
  padding: 12px 20px;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  color: #052228;
  cursor: pointer;
  background: linear-gradient(135deg, #5bd1ff, #6ee7b7);
  box-shadow: 0 6px 20px rgba(25,133,178,0.2);
  transition: transform 0.2s, box-shadow 0.2s;
}
button:active { transform: translateY(2px); }
button.secondary {
  background: transparent;
  color: #ccc;
  border: 1px solid rgba(255,255,255,0.1);
}

/* Result + confetti + footer */
.result {
  min-height: 28px;
  font-weight: 600;
  font-size: 1.1rem;
  color: #ccc;
}

.confetti {
  position: fixed;
  z-index: 5;
  pointer-events: none;
  width: 10px;
  height: 16px;
  border-radius: 50%;
  opacity: 0.9;
  transform-origin: center;
}

.footer {
  margin-top: 15px;
  text-align: center;
  font-size: 0.85rem;
  color: #ccc;
}

/* Responsive */
@media (max-width: 480px) {
  .coin-wrap { width: 120px; height: 120px; }
  .coin { width: 110px; height: 110px; }
  .face { font-size: 2.4rem; }
  .container h1 { font-size: 1.8rem; }
  button { padding: 10px 16px; font-size: 0.95rem; }
}