/* GlamCalc pink calculator design */
body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 0;
  background: #fecde4; /* pastel pink */
  font-family: 'Arial', sans-serif;
}

.calculator {
  background: #ff5fa2; /* main pink body */
  border-radius: 35px;
  padding: 20px;
  width: 320px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
  position: relative;
  transition: width 0.5s ease;
  display: flex;
  flex-direction: column;
}

/* Advanced Mode: Extend the calculator layout */
.calculator.advanced-mode {
  width: 520px;
}

/* Container for keypad and advanced functions side-by-side */
.keypad-container {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

/* Advanced Functions Column (hidden in simple mode) */
.advanced-column {
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-rows: 65px;
  gap: 12px;
  opacity: 0;
  max-width: 0;
  transition: opacity 0.3s ease, max-width 0.3s ease;
  overflow: hidden;
}

/* Show advanced column in advanced mode */
.calculator.advanced-mode .advanced-column {
  opacity: 1;
  max-width: 70px;
}

/* Optional: a gentle glitter around the calculator's border all the time */
.calculator::before {
  content: '';
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border-radius: 48px; /* a bit larger than 40px for a halo */
  background: radial-gradient(circle, rgba(255,255,255,0.2), rgba(255,255,255,0) 70%);
  pointer-events: none;
  animation: sparkle-pulse 3s infinite alternate;
}

/* Slow pulse for overall glitter */
@keyframes sparkle-pulse {
  0%   { opacity: 0.1; }
  50%  { opacity: 0.25; }
  100% { opacity: 0.1; }
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 12px;
}

/* "Glam" - Fancy, curvy, luxe style */
.logo-glam {
  font-family: 'Georgia', 'Garamond', serif;
  font-size: 22px;
  font-weight: 900;
  font-style: italic;
  background: linear-gradient(135deg, #ff5fa2 0%, #ffb3d9 50%, #d4949c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px rgba(255, 95, 162, 0.4);
  filter: drop-shadow(0 0 8px rgba(255, 95, 162, 0.3));
  letter-spacing: -0.5px;
}

/* Sparkle separator */
.logo-sparkle {
  font-size: 16px;
  margin: 0 3px;
  animation: sparkle-twinkle 1.5s ease-in-out infinite;
}

@keyframes sparkle-twinkle {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* "Calc" - Modern, geometric, crisp tech style */
.logo-calc {
  font-family: 'Arial', 'Helvetica', sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: #fff;
  text-transform: uppercase;
}

.display {
  padding: 15px 10px;
  color: #fff;
  height: 60px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.display .expression { font-size: 24px; }
.display .result     { font-size: 36px; font-weight: bold; }

.keypad {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 65px;
  gap: 12px;
}

/* Scientific Toolbar */
.scientific-toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
  justify-content: center;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.4s ease, max-height 0.4s ease, margin-bottom 0.4s ease;
}

.calculator.advanced-mode .scientific-toolbar {
  opacity: 1;
  max-height: 150px;
  margin-bottom: 12px;
}

.sci-btn {
  width: 55px !important;
  height: 55px !important;
  border-radius: 50% !important;
  padding: 0 !important;
  font-size: 11px !important;
  font-weight: 600;
  text-align: center;
  display: flex !important;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

/* Memory buttons in advanced column */
.memory-btn {
  width: 65px !important;
  height: 65px !important;
  font-size: 13px !important;
  font-weight: 700;
}

.btn {
  border: none;
  border-radius: 50%; /* Circular lollipop shape */
  font-size: 24px;
  color: #fff;
  background: linear-gradient(135deg, #ffb3d9 0%, #ff8cc6 50%, #ff6fb5 100%); /* Glossy candy gradient */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  /* Lollipop stick shadow effect */
  box-shadow:
    0 6px 0 #d4508c,  /* stick shadow */
    0 8px 15px rgba(0, 0, 0, 0.2),  /* depth */
    inset 0 -3px 8px rgba(0, 0, 0, 0.2),  /* inner shadow */
    inset 0 3px 12px rgba(255, 255, 255, 0.4);  /* glossy highlight */
  transition: filter 0.2s, box-shadow 0.3s, transform 0.1s;

  position: relative;   /* NEW: so ::after positions relative to the button */
  overflow: visible;    /* NEW: let the halo extend outside the button */
  width: 65px;
  height: 65px;
}

/* Soft sparkle/halo around each button */
.btn::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: inherit;
  background: radial-gradient(circle, rgba(255,255,255,0.6), rgba(255,255,255,0) 70%);
  opacity: 0;
  pointer-events: none; /* so the halo doesn't block clicks */
  transition: opacity 0.4s ease-in-out;
}

/* Show a soft halo when the user hovers over a button */
.btn:hover::after {
  opacity: 0.4;
}

/* Animate the halo quickly when the button is clicked */
.btn.clicked::after {
  animation: sparkle-fade 0.6s forwards;
}

/* Keyframes for fading the halo out after click */
@keyframes sparkle-fade {
  from { opacity: 0.6; }
  to   { opacity: 0; }
}

/* new rule: simulate pressing the button by moving it down and reducing the shadow */
.btn:active {
  transform: translateY(6px);
  box-shadow:
    0 2px 0 #d4508c,  /* shorter stick when pressed */
    0 3px 8px rgba(0, 0, 0, 0.2),
    inset 0 -2px 6px rgba(0, 0, 0, 0.3),
    inset 0 2px 8px rgba(255, 255, 255, 0.3);
}

.btn:hover     { filter: brightness(1.1); }
.btn.function,
.btn.operator,
.btn.equal      {
  background: linear-gradient(135deg, #ff9fcf 0%, #ff6fb5 50%, #ff4d9f 100%); /* Darker candy gradient */
}
.btn.zero       {
  grid-column: span 2;
  border-radius: 40px; /* Oval shape for double-wide lollipop */
  width: auto;
}
.btn.clicked    {
  box-shadow:
    0 8px 0 #d4508c,
    0 0 20px 8px rgba(255,255,255,0.9),
    inset 0 -3px 8px rgba(0, 0, 0, 0.2),
    inset 0 3px 12px rgba(255, 255, 255, 0.4);
}

/* Glitter animation (already used in script) */
.calculator.sparkle { animation: glitter 1s ease-in-out; }
@keyframes glitter {
  0%   { box-shadow: 0 0 0 0 rgba(255,255,255,0); }
  50%  { box-shadow: 0 0 20px 6px rgba(255,255,255,0.8); }
  100% { box-shadow: 0 0 0 0 rgba(255,255,255,0); }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .calculator         { width: 90%; }
  .keypad             { grid-auto-rows: 60px; gap: 12px; }
  .btn                {
    font-size: 24px;
    width: 60px;
    height: 60px;
  }
  .btn.zero           { border-radius: 30px; } /* Keep oval for smaller screens */
  .logo               { font-size: 36px; }
  .display .expression{ font-size: 24px; }
  .display .result    { font-size: 36px; }
}

/* Controls container for day/night and sound toggles */
.controls {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-bottom: 10px;
}
.control-btn {
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 24px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(5px);
  transition: filter 0.2s;
}
.control-btn:hover {
  filter: brightness(1.2);
}
/* Day and night theme styles */
.calculator.day {
  background: #ff5fa2;
}
body.day {
  background: #fecde4;
}
/* Midnight Glam dark mode theme */
body.night {
  background: linear-gradient(to bottom, #4b004d, #0a0010);
}

.calculator.night {
  background: #d4006a;
}

.calculator.night .btn {
  background: linear-gradient(135deg, #d4006a 0%, #b00050 50%, #8b003e 100%);
  color: #ffffff;
  box-shadow:
    0 8px 0 #7d0036,
    0 10px 20px rgba(0, 0, 0, 0.5),
    inset 0 -3px 8px rgba(0, 0, 0, 0.3),
    inset 0 3px 12px rgba(255, 255, 255, 0.2);
}

.calculator.night .btn:active {
  transform: translateY(6px);
  box-shadow:
    0 2px 0 #7d0036,
    0 3px 8px rgba(0, 0, 0, 0.5),
    inset 0 -2px 6px rgba(0, 0, 0, 0.4),
    inset 0 2px 8px rgba(255, 255, 255, 0.2);
}

.calculator.night .btn.operator,
.calculator.night .btn.function,
.calculator.night .btn.equal {
  background: linear-gradient(135deg, #e6007a 0%, #c70063 50%, #a0004d 100%);
}

/* Midnight Glam dark mode override */
body.night {
  background: linear-gradient(to bottom, #4b004d, #0a0010);
}
.calculator.night {
  background: #d4006a;
}
.calculator.night .btn {
  background: linear-gradient(135deg, #d4006a 0%, #b00050 50%, #8b003e 100%);
  color: #ffffff;
  box-shadow:
    0 8px 0 #7d0036,
    0 10px 20px rgba(0, 0, 0, 0.5),
    inset 0 -3px 8px rgba(0, 0, 0, 0.3),
    inset 0 3px 12px rgba(255, 255, 255, 0.2);
}
.calculator.night .btn:active {
  transform: translateY(6px);
  box-shadow:
    0 2px 0 #7d0036,
    0 3px 8px rgba(0, 0, 0, 0.5),
    inset 0 -2px 6px rgba(0, 0, 0, 0.4),
    inset 0 2px 8px rgba(255, 255, 255, 0.2);
}
.calculator.night .btn.operator,
.calculator.night .btn.function,
.calculator.night .btn.equal {
  background: linear-gradient(135deg, #e6007a 0%, #c70063 50%, #a0004d 100%);
}

/* ===== MOOD-BASED THEMES ===== */

/* Theme 1: Barbie Office Day (Default) */
body.theme-barbie-day {
  background: #fecde4;
}
.calculator.theme-barbie-day {
  background: #ff5fa2;
}
.calculator.theme-barbie-day .btn {
  background: linear-gradient(135deg, #ffb3d9 0%, #ff8cc6 50%, #ff6fb5 100%);
  box-shadow:
    0 8px 0 #d4508c,
    0 10px 20px rgba(0, 0, 0, 0.2),
    inset 0 -3px 8px rgba(0, 0, 0, 0.2),
    inset 0 3px 12px rgba(255, 255, 255, 0.4);
}
.calculator.theme-barbie-day .btn:active {
  box-shadow:
    0 2px 0 #d4508c,
    0 3px 8px rgba(0, 0, 0, 0.2),
    inset 0 -2px 6px rgba(0, 0, 0, 0.3),
    inset 0 2px 8px rgba(255, 255, 255, 0.3);
}
.calculator.theme-barbie-day .btn.operator,
.calculator.theme-barbie-day .btn.function,
.calculator.theme-barbie-day .btn.equal {
  background: linear-gradient(135deg, #ff9fcf 0%, #ff6fb5 50%, #ff4d9f 100%);
}

/* Logo styling for barbie-day theme */
.calculator.theme-barbie-day .logo-glam {
  background: linear-gradient(135deg, #ff5fa2 0%, #ffb3d9 50%, #d4949c 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(255, 95, 162, 0.4));
}

.calculator.theme-barbie-day .logo-sparkle {
  color: #ff5fa2;
}

.calculator.theme-barbie-day .logo-calc {
  color: #fff;
}

/* Theme 2: Midnight Glam (Dark Blue) */
body.theme-midnight {
  background: linear-gradient(135deg, #1a3a6c 0%, #0d1f3d 100%);
}
.calculator.theme-midnight {
  background: #2d5a8c;
}
.calculator.theme-midnight .btn {
  background: linear-gradient(135deg, #4a7ba7 0%, #2d5a8c 50%, #1a3a5c 100%);
  color: #ffffff;
  box-shadow:
    0 8px 0 #0f2e4d,
    0 10px 20px rgba(0, 0, 0, 0.8),
    inset 0 -3px 8px rgba(0, 0, 0, 0.5),
    inset 0 3px 12px rgba(135, 200, 255, 0.3);
}
.calculator.theme-midnight .btn:active {
  box-shadow:
    0 2px 0 #0f2e4d,
    0 3px 8px rgba(0, 0, 0, 0.8),
    inset 0 -2px 6px rgba(0, 0, 0, 0.6),
    inset 0 2px 8px rgba(135, 200, 255, 0.2);
}
.calculator.theme-midnight .btn.operator,
.calculator.theme-midnight .btn.function,
.calculator.theme-midnight .btn.equal {
  background: linear-gradient(135deg, #5a8fc7 0%, #4a7ba7 50%, #2d5a8c 100%);
}

/* Logo styling for midnight theme */
.calculator.theme-midnight .logo-glam {
  background: linear-gradient(135deg, #87ceeb 0%, #4a9eff 50%, #2d8cc4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(74, 123, 167, 0.5));
}

.calculator.theme-midnight .logo-sparkle {
  color: #87ceeb;
}

.calculator.theme-midnight .logo-calc {
  color: #fff;
}

/* Theme 3: Rose Gold Champagne */
body.theme-rose-gold {
  background: linear-gradient(135deg, #fff5e6 0%, #ffe8d6 100%);
}
.calculator.theme-rose-gold {
  background: linear-gradient(135deg, #e8b4b8 0%, #d4949c 100%);
}
.calculator.theme-rose-gold .btn {
  background: linear-gradient(135deg, #f4c2c2 0%, #e8a8a8 50%, #d47a7a 100%);
  color: #5c3d3d;
  box-shadow:
    0 8px 0 #b8696e,
    0 10px 20px rgba(0, 0, 0, 0.15),
    inset 0 -3px 8px rgba(0, 0, 0, 0.1),
    inset 0 3px 12px rgba(255, 255, 255, 0.5);
}
.calculator.theme-rose-gold .btn:active {
  box-shadow:
    0 2px 0 #b8696e,
    0 3px 8px rgba(0, 0, 0, 0.15),
    inset 0 -2px 6px rgba(0, 0, 0, 0.2),
    inset 0 2px 8px rgba(255, 255, 255, 0.4);
}
.calculator.theme-rose-gold .btn.operator,
.calculator.theme-rose-gold .btn.function,
.calculator.theme-rose-gold .btn.equal {
  background: linear-gradient(135deg, #e8a8a8 0%, #d47a7a 50%, #c04d4d 100%);
}
.calculator.theme-rose-gold .display {
  color: #5c3d3d;
}

/* Logo styling for rose-gold theme */
.calculator.theme-rose-gold .logo-glam {
  background: linear-gradient(135deg, #d4949c 0%, #e8b4b8 50%, #f0c4c8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(212, 149, 156, 0.4));
}

.calculator.theme-rose-gold .logo-sparkle {
  color: #d4949c;
}

.calculator.theme-rose-gold .logo-calc {
  color: #5c3d3d;
}

/* Theme 4: Galaxy Glitter */
body.theme-galaxy {
  background: linear-gradient(135deg, #0a0e27 0%, #16213e 50%, #1a0033 100%);
}
.calculator.theme-galaxy {
  background: linear-gradient(135deg, #1a0e3f 0%, #2d0852 50%, #1f1045 100%);
}
.calculator.theme-galaxy .btn {
  background: linear-gradient(135deg, #6a5acd 0%, #9932cc 50%, #ba55d3 100%);
  color: #ffffff;
  box-shadow:
    0 8px 0 #4b0082,
    0 10px 20px rgba(138, 43, 226, 0.4),
    inset 0 -3px 8px rgba(0, 0, 0, 0.4),
    inset 0 3px 12px rgba(255, 215, 0, 0.2);
}
.calculator.theme-galaxy .btn:active {
  box-shadow:
    0 2px 0 #4b0082,
    0 3px 8px rgba(138, 43, 226, 0.4),
    inset 0 -2px 6px rgba(0, 0, 0, 0.5),
    inset 0 2px 8px rgba(255, 215, 0, 0.15);
}
.calculator.theme-galaxy .btn.operator,
.calculator.theme-galaxy .btn.function,
.calculator.theme-galaxy .btn.equal {
  background: linear-gradient(135deg, #9932cc 0%, #ba55d3 50%, #da70d6 100%);
}

/* Logo styling for galaxy theme */
.calculator.theme-galaxy .logo-glam {
  background: linear-gradient(135deg, #9d4edd 0%, #c77dff 50%, #e0aaff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(157, 78, 221, 0.5));
}

.calculator.theme-galaxy .logo-sparkle {
  color: #c77dff;
}

.calculator.theme-galaxy .logo-calc {
  color: #fff;
}

/* Theme selector styling with circular buttons */
.theme-selector {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 10px;
}

.theme-btn {
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 24px;
  width: 45px;
  height: 45px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  padding: 0;
}

.theme-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: scale(1.1);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.theme-btn.active {
  background: rgba(255, 255, 255, 0.35);
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.4);
  transform: scale(1.15);
}

.theme-btn:active {
  transform: scale(0.95);
}

/* Custom velvet heart SVG styling */
.theme-heart {
  width: 28px;
  height: 28px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* ===== HISTORY BUTTON IN KEYPAD ===== */

.history-btn {
  grid-column: 1 / -1;  /* Span all columns */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.35), rgba(212, 149, 156, 0.35)) !important;
  border: 1.5px solid rgba(255, 95, 162, 0.6) !important;
  border-radius: 15px !important;
  color: #ff5fa2;
  padding: 0 14px !important;
  font-weight: 600;
  font-size: 12px;
  box-shadow: 0 3px 12px rgba(255, 95, 162, 0.15) !important;
  backdrop-filter: blur(10px);
  white-space: nowrap;
  height: 36px !important;
  width: fit-content !important;
  margin: 0 auto;
  transition: all 0.3s ease;
}

.history-btn:hover {
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.45), rgba(212, 149, 156, 0.45)) !important;
  border-color: rgba(255, 95, 162, 0.8) !important;
  box-shadow: 0 4px 16px rgba(255, 95, 162, 0.3), 0 0 12px rgba(255, 95, 162, 0.25) !important;
  transform: translateY(-1px);
}

.history-btn:active {
  transform: translateY(0);
  animation: sparkle-fade 0.6s;
}

.history-tab-icon {
  font-size: 14px;
  animation: glow-pulse 2s infinite;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.7; text-shadow: 0 0 0 rgba(255, 95, 162, 0); }
  50% { opacity: 1; text-shadow: 0 0 12px rgba(255, 95, 162, 0.5); }
}

.history-tab-text {
  font-size: 10px;
  letter-spacing: 0.2px;
}

/* Theme-specific history button colors */
.calculator.theme-barbie-day .history-btn {
  border-color: rgba(255, 95, 162, 0.8) !important;
  color: #fff;
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.55), rgba(255, 111, 181, 0.5)) !important;
}

.calculator.theme-barbie-day .history-btn:hover {
  box-shadow: 0 4px 16px rgba(255, 95, 162, 0.4), 0 0 12px rgba(255, 95, 162, 0.3) !important;
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.65), rgba(255, 111, 181, 0.6)) !important;
}

.calculator.theme-midnight .history-btn {
  border-color: rgba(74, 123, 167, 0.6) !important;
  color: #4a7ba7;
  background: linear-gradient(135deg, rgba(74, 123, 167, 0.3), rgba(45, 90, 140, 0.3)) !important;
}

.calculator.theme-midnight .history-btn:hover {
  box-shadow: 0 4px 16px rgba(74, 123, 167, 0.3), 0 0 12px rgba(74, 123, 167, 0.2) !important;
}

.calculator.theme-rose-gold .history-btn {
  border-color: rgba(212, 149, 156, 0.85) !important;
  color: #fff;
  background: linear-gradient(135deg, rgba(212, 149, 156, 0.6), rgba(192, 112, 128, 0.55)) !important;
}

.calculator.theme-rose-gold .history-btn:hover {
  box-shadow: 0 4px 16px rgba(212, 149, 156, 0.4), 0 0 12px rgba(212, 149, 156, 0.3) !important;
  background: linear-gradient(135deg, rgba(212, 149, 156, 0.7), rgba(192, 112, 128, 0.65)) !important;
}

.calculator.theme-galaxy .history-btn {
  border-color: rgba(137, 76, 255, 0.6) !important;
  color: #9d4edd;
  background: linear-gradient(135deg, rgba(157, 78, 221, 0.3), rgba(109, 40, 217, 0.3)) !important;
}

.calculator.theme-galaxy .history-btn:hover {
  box-shadow: 0 4px 16px rgba(157, 78, 221, 0.3), 0 0 12px rgba(157, 78, 221, 0.2) !important;
}

/* OLD HISTORY TAB - NO LONGER USED */
.history-tab {
  display: none;
}

/* ===== HISTORY PANEL ===== */

.history-toggle {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  font-size: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.history-toggle:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.history-panel {
  position: fixed;
  right: -400px;
  top: 0;
  width: 380px;
  height: 100vh;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.2);
  transition: right 0.3s ease;
  z-index: 1000;
  display: flex;
  flex-direction: column;
}

.history-panel.open {
  right: 0;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.1), rgba(212, 149, 156, 0.1));
}

.history-header h2 {
  margin: 0;
  color: #333;
  font-size: 1.5em;
}

.history-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #666;
  transition: color 0.2s;
}

.history-close:hover {
  color: #ff5fa2;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 15px;
}

.history-item {
  background: white;
  border: 1px solid rgba(255, 95, 162, 0.2);
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.history-item:hover {
  background: rgba(255, 95, 162, 0.1);
  transform: translateX(-5px);
  box-shadow: 0 4px 12px rgba(255, 95, 162, 0.2);
  border-color: rgba(255, 95, 162, 0.4);
}

.history-item-expression {
  font-size: 0.9em;
  color: #666;
  margin-bottom: 5px;
  font-weight: 500;
}

.history-item-result {
  font-size: 1.3em;
  color: #ff5fa2;
  font-weight: bold;
}

.history-empty {
  text-align: center;
  color: #999;
  padding: 40px 20px;
  font-size: 0.95em;
}

.history-clear {
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.2), rgba(255, 111, 181, 0.2));
  border: 2px solid rgba(255, 95, 162, 0.4);
  color: #ff5fa2;
  padding: 12px 20px;
  margin: 15px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95em;
  font-weight: bold;
  transition: all 0.3s ease;
}

.history-clear:hover {
  background: linear-gradient(135deg, rgba(255, 95, 162, 0.3), rgba(255, 111, 181, 0.3));
  border-color: rgba(255, 95, 162, 0.6);
  box-shadow: 0 4px 12px rgba(255, 95, 162, 0.2);
}

.history-overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0);
  z-index: 999;
  transition: background 0.3s ease;
  pointer-events: none;
}

.history-overlay.open {
  background: rgba(0, 0, 0, 0.3);
  pointer-events: all;
}