:root {
  --choco1: #7B3F00;     
  --choco2: #D2691E;      
  --choco3: #fff8f0;      
  --accent: #ffb347;      
  --glass-bg: rgba(255,255,255,0.35);
  --glass-blur: 18px;
  --shadow: 0 8px 32px 0 rgba(123,63,0,0.13);
  --text: #3d2c1e;
  --bg: linear-gradient(135deg, #fff8f0 0%, #d2691e 100%);
  --operator-bg: linear-gradient(90deg, var(--accent), var(--choco2));
  --operator-hover: linear-gradient(90deg, var(--choco2), var(--accent));
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Montserrat', 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.top-header {
  width: 100%;
  padding: 12px 28px 0 18px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  position: fixed; 
  top: 0;
  left: 0;
  background: transparent; 
  z-index: 1000;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 10px;
}

.logo img {
  width: 44px;   
  height: 44px;
  border-radius: 10px;
  box-shadow: 0 0 8px #ffb34777;
  background: #fff8f0;
}

.hidding {
  font-size: 1.25rem;
  color: #D2691E; 
  font-weight: 600;
  letter-spacing: 1px;
  display: inline-block;
}

@media (max-width: 600px) {
  .logo img { width: 34px; height: 34px; }
  .hidding { font-size: 1rem; }
  .top-header { padding: 6px 10px 0 6px; }
}

.glass-calculator {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 32px 28px 22px 28px;
  width: 320px;
  text-align: center;
  margin-top: 60px;
}

.calc-title {
  font-size: 1.9rem;
  margin-bottom: 12px;
  color: var(--choco2);
  text-shadow: 0 0 12px var(--accent);
}
.choco-text {
  color: var(--choco1);
}

.display {
  background: #fff;
  color: var(--choco1);
  font-size: 2.1rem;
  padding: 14px 10px;
  border-radius: 12px;
  text-align: right;
  margin-bottom: 20px;
  min-height: 54px;
  overflow-x: auto;
  box-shadow: 0 2px 4px #eec99114;
  letter-spacing: 1px;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 13px 10px;
}
button {
  padding: 17px 0;
  font-size: 1.18rem;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  background: #fff8f0;
  color: var(--choco1);
  box-shadow: 0 2px 8px #bc855017;
  font-weight: 600;
  transition: background 0.22s, color 0.2s, box-shadow 0.25s;
  outline: none;
}
button.operator {
  background: var(--operator-bg);
  color: #fff;
}
button.operator:hover {
  background: var(--operator-hover);
  color: #fff;
}
button.equals-btn {
  background: var(--accent);
  color: #fff;
  grid-row: span 2;
}
button.zero-btn {
  grid-column: span 2;
}
button:active {
  background: #ffe6c7;
  color: var(--choco2);
}

button.ripple-effect {
  position: relative;
  overflow: hidden;
}
button .ripple-anim {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 179, 71, 0.29);
  animation: ripple 0.8s linear;
  pointer-events: none;
  z-index: 2;
}
@keyframes ripple {
  from {opacity: 0.6; transform: scale(0);}
  to {opacity: 0; transform: scale(4);}
}

.glass-footer {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 18px;
  box-shadow: var(--shadow);
  margin-top: 38px;
  padding: 17px 25px 14px 25px;
  width: 325px;
  display: flex;
  justify-content: center;
  gap: 20px;
}
.social-link {
  color: var(--choco1);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.23s, transform 0.21s;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1rem;
}
.social-link:hover {
  color: var(--accent);
  transform: scale(1.1);
}
@media (max-width: 420px) {
  .glass-calculator, .glass-footer {
    width: 96vw;
    min-width: unset;
    max-width: 99vw;
    padding: 18px 4vw;
  }
  .top-left-logo { width: 44px; }
  .glass-footer { flex-direction: column; gap: 10px;}
}