/* ======================================= */
/* REKENTOOL - MODERN UNIFIED              */
/* ======================================= */

/* ===== COLOR DEFINITIONS ===== */
/* Dark mode is default, light mode overrides via :root.light-mode */

.calculator-card {
  /* Dark mode colors */
  --calc-card-bg-card: var(--secondary-bg);
  --calc-card-bg-input: var(--primary-bg);
  --calc-card-bg-form: var(--secondary-bg);
  --calc-card-border: var(--border-color);
  --calc-card-text: var(--text-primary);
  --calc-card-text-secondary: var(--text-secondary);
  --calc-card-button-bg: var(--link-color);
  --calc-card-button-text: var(--text-primary);
  --calc-card-button-border: var(--border-color);
  --calc-card-button-hover-border: var(--link-color);
  --calc-card-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --calc-card-accent-blue: #3b82f6;
  --calc-card-overlay-dark: rgba(255, 255, 255, 0.05);
  --calc-card-overlay-medium: rgba(255, 255, 255, 0.08);
  --calc-card-overlay-light: rgba(255, 255, 255, 0.03);
  --calc-card-border-dark: rgba(45, 55, 72, 0.5);
  --calc-card-focus-border: var(--link-color);
  --calc-card-focus-shadow: rgba(88, 166, 255, 0.1);
}

/* Light mode color overrides */
:root.light-mode .calculator-card {
  --calc-card-bg-card: #ffffff;
  --calc-card-bg-input: #ffffff;
  --calc-card-bg-form: #f9fafb;
  --calc-card-border: #d0d7de;
  --calc-card-text: #24292f;
  --calc-card-text-secondary: #57606a;
  --calc-card-button-bg: #ffffff;
  --calc-card-button-text: #24292f;
  --calc-card-button-border: #d0d7de;
  --calc-card-button-hover-border: #0969da;
  --calc-card-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --calc-card-accent-blue: #3b82f6;
  --calc-card-overlay-dark: #f9fafb;
  --calc-card-overlay-medium: #f3f4f6;
  --calc-card-overlay-light: #ffffff;
  --calc-card-border-dark: #d0d7de;
  --calc-card-focus-border: #0969da;
  --calc-card-focus-shadow: rgba(9, 105, 218, 0.1);
}

/* ===== MAIN CARD ===== */
.calculator-card {
  max-width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--calc-card-bg-card);
  border: 1px solid var(--calc-card-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--calc-card-text);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

/* Gradient top border */
.calculator-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--calc-card-accent-blue), #2563eb, var(--calc-card-accent-blue));
  background-size: 200% 100%;
  animation: calcGradientShift 3s ease infinite;
}

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

/* ===== HEADER ===== */
.calculator-card h1 {
  color: var(--calc-card-text);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.calculator-card .intro {
  text-align: center;
  color: var(--calc-card-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  font-weight: 400;
}

/* ===== LAYOUT ===== */
.calculator-card .calculator-layout {
  display: grid;
  grid-template-columns: 500px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.calculator-card .calculator-main {
  display: flex;
  flex-direction: column;
}

/* ===== DISPLAY ===== */
.calculator-card .calc-display {
  margin-bottom: 1.25rem;
}

.calculator-card .calc-display input {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--calc-card-bg-input);
  color: var(--calc-card-text);
  border: 2px solid var(--calc-card-border);
  border-radius: 8px;
  font-family: 'Courier New', monospace;
  font-size: 1.3rem;
  text-align: right;
  transition: all 0.2s ease;
  box-sizing: border-box;
  font-weight: 600;
  letter-spacing: 1px;
}

.calculator-card .calc-display input::placeholder {
  color: var(--calc-card-text-secondary);
  opacity: 0.5;
  font-weight: 400;
}

.calculator-card .calc-display input:focus {
  outline: none;
  border-color: var(--calc-card-focus-border);
  box-shadow: 0 0 0 3px var(--calc-card-focus-shadow);
}

.calculator-card .calc-display input:hover {
  border-color: var(--calc-card-button-hover-border);
}

/* ===== BUTTONS GRID ===== */
.calculator-card .calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.calculator-card .calc-btn {
  padding: 1.25rem 0;
  border: 2px solid var(--calc-card-border);
  border-radius: 8px;
  background: var(--calc-card-button-bg);
  color: var(--calc-card-button-text);
  font-size: 1.15rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.calculator-card .calc-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
  pointer-events: none;
}

.calculator-card .calc-btn:hover::before {
  width: 300px;
  height: 300px;
}

.calculator-card .calc-btn:hover {
  background: var(--calc-card-bg-card);
  border-color: var(--calc-card-button-hover-border);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--calc-card-button-hover-shadow);
}

.calculator-card .calc-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Operator buttons - Blue */
.calculator-card .calc-btn.op {
  background: linear-gradient(135deg, var(--calc-card-accent-blue) 0%, #2563eb 100%);
  border-color: var(--calc-card-accent-blue);
  color: white;
  font-weight: 600;
}

.calculator-card .calc-btn.op:hover {
  background: linear-gradient(135deg, #3b82f6 0%, var(--calc-card-accent-blue) 100%);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* Clear button - Orange */
.calculator-card .calc-btn.clear {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  border-color: #f59e0b;
  color: white;
  font-weight: 600;
}

.calculator-card .calc-btn.clear:hover {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* Equals button - Green */
.calculator-card .calc-btn.equals {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  border-color: #10b981;
  color: white;
  font-size: 1.4rem;
  font-weight: 600;
}

.calculator-card .calc-btn.equals:hover {
  background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

/* ===== OUTPUT BOX ===== */
.calculator-card .output-box {
  background: var(--calc-card-bg-form);
  border: 2px solid var(--calc-card-border);
  border-radius: 8px;
  text-align: right;
  padding: 1rem 1.25rem;
  font-family: 'Courier New', monospace;
  font-size: 1.4rem;
  color: var(--calc-card-text);
  margin-bottom: 1.25rem;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 700;
  letter-spacing: 1px;
}

.calculator-card .output-box:hover {
  border-color: var(--calc-card-button-hover-border);
  box-shadow: 0 4px 12px var(--calc-card-button-hover-shadow);
  transform: translateY(-2px);
}

.calculator-card .output-box.has-result {
  border-color: #10b981;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.calculator-card .output-box.has-result span {
  color: #10b981;
  font-weight: 700;
}

.calculator-card .output-box.has-error {
  border-color: #ef4444;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
}

.calculator-card .output-box.has-error span {
  color: #ef4444;
  font-weight: 700;
}

/* ===== LOG SECTION ===== */
.calculator-card .calc-log {
  background: var(--calc-card-bg-form);
  border: 1px solid var(--calc-card-border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  width: 100%;
  box-sizing: border-box;
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.calculator-card .calc-log:hover {
  border-color: var(--calc-card-button-hover-border);
}

.calculator-card .log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.875rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--calc-card-border);
}

.calculator-card .calc-log h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--calc-card-accent-blue);
  margin: 0;
}

.calculator-card .clear-log-btn {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: white;
  border: 2px solid #ef4444;
  padding: 0.5rem 0.875rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
  position: relative;
  overflow: hidden;
}

.calculator-card .clear-log-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
  pointer-events: none;
}

.calculator-card .clear-log-btn:hover::before {
  width: 300px;
  height: 300px;
}

.calculator-card .clear-log-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.calculator-card .clear-log-btn:active {
  transform: translateY(0);
}

.calculator-card .log-list {
  width: 100%;
  box-sizing: border-box;
  max-height: 100%;
  flex: 1;
  overflow-y: auto;
  font-family: 'Courier New', monospace;
  background: var(--calc-card-bg-input);
  border: 2px solid var(--calc-card-border);
  border-radius: 8px;
  padding: 0.625rem;
}

.calculator-card .log-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0.875rem;
  border-bottom: 1px solid var(--calc-card-border);
  transition: all 0.2s ease;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 0.375rem;
}

.calculator-card .log-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.calculator-card .log-entry:hover {
  background: var(--calc-card-overlay-medium);
  border-color: var(--calc-card-button-hover-border);
  transform: translateX(6px);
  box-shadow: 0 2px 8px var(--calc-card-button-hover-shadow);
}

.calculator-card .log-entry .expr {
  flex: 1;
  color: var(--calc-card-text-secondary);
  font-size: 0.95rem;
  word-break: break-word;
}

.calculator-card .log-entry .res {
  color: var(--calc-card-accent-blue);
  font-weight: 700;
  font-size: 1rem;
}

.calculator-card .log-empty {
  color: var(--calc-card-text-secondary);
  text-align: center;
  font-size: 0.9rem;
  padding: 1.875rem 0;
  font-style: italic;
  opacity: 0.6;
}

/* ===== SCROLLBAR STYLING ===== */
.calculator-card .log-list::-webkit-scrollbar {
  width: 8px;
}

.calculator-card .log-list::-webkit-scrollbar-track {
  background: var(--calc-card-bg-input);
  border-radius: 4px;
}

.calculator-card .log-list::-webkit-scrollbar-thumb {
  background: var(--calc-card-accent-blue);
  border-radius: 4px;
}

.calculator-card .log-list::-webkit-scrollbar-thumb:hover {
  background: #2563eb;
}

/* ===== ANIMATIONS ===== */
@keyframes calcSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.calculator-card .log-entry {
  animation: calcSlideIn 0.3s ease;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .calculator-card .calculator-layout {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .calculator-card .calc-log {
    height: auto;
  }

  .calculator-card .log-list {
    max-height: 260px;
    flex: none;
  }
}

@media (max-width: 768px) {
  .calculator-card {
    padding: 1rem;
    border-radius: 12px;
  }

  .calculator-card h1 {
    font-size: 1.5rem;
  }

  .calculator-card .intro {
    font-size: 0.88rem;
    margin-bottom: 1.25rem;
  }

  .calculator-card .calc-display input {
    font-size: 1.15rem;
    padding: 0.875rem 1rem;
  }

  .calculator-card .calc-buttons {
    gap: 0.625rem;
  }

  .calculator-card .calc-btn {
    padding: 1rem 0;
    font-size: 1.05rem;
  }

  .calculator-card .calc-btn.equals {
    font-size: 1.25rem;
  }

  .calculator-card .output-box {
    font-size: 1.2rem;
    padding: 0.875rem 1rem;
    min-height: 54px;
  }

  .calculator-card .calc-log {
    padding: 1rem;
  }

  .calculator-card .log-list {
    max-height: 200px;
    padding: 0.5rem;
  }

  .calculator-card .log-entry {
    padding: 0.625rem 0.75rem;
  }

  .calculator-card .log-entry .expr {
    font-size: 0.85rem;
  }

  .calculator-card .log-entry .res {
    font-size: 0.9rem;
  }

  .calculator-card .log-empty {
    padding: 1.5rem 0;
    font-size: 0.85rem;
  }
}

@media (max-width: 576px) {
  .calculator-card {
    padding: 1rem;
  }

  .calculator-card h1 {
    font-size: 1.3rem;
  }

  .calculator-card .intro {
    font-size: 0.85rem;
  }

  .calculator-card .calc-buttons {
    gap: 0.5rem;
  }

  .calculator-card .calc-btn {
    padding: 0.875rem 0;
    font-size: 1rem;
  }

  .calculator-card .calc-btn.equals {
    font-size: 1.15rem;
  }

  .calculator-card .calc-display input {
    font-size: 1.05rem;
    padding: 0.75rem 0.875rem;
  }

  .calculator-card .output-box {
    font-size: 1.1rem;
    padding: 0.75rem 0.875rem;
  }

  .calculator-card .calc-log {
    padding: 0.875rem;
  }

  .calculator-card .log-list {
    max-height: 180px;
  }
}

@media (max-width: 480px) {
  .calculator-card .calc-buttons {
    gap: 0.5rem;
  }

  .calculator-card .calc-btn {
    padding: 0.875rem 0;
    font-size: 0.95rem;
  }
}