@font-face {
    font-family: 'Inter';
    src: url('../../assets/fonts/Inter.ttf') format('truetype');
    font-weight: 100 900;
    font-display: swap;
}

:root {
  --primary-color: #2563eb;
  --secondary-color: #3b82f6;
  --bg-color: #f0f4f8;
  --bg-card: #ffffff;
  --text-color: #1e293b;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  --success-color: #10b981;
  --error-color: #ef4444;
  --accent-color: #f59e0b;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 6px rgba(0,0,0,0.07), 0 10px 15px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
}

.dark-theme {
  --primary-color: #3b82f6;
  --secondary-color: #60a5fa;
  --bg-color: #0f172a;
  --bg-card: #1e293b;
  --text-color: #f1f5f9;
  --text-light: #94a3b8;
  --border-color: #334155;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-lg: 0 4px 6px rgba(0,0,0,0.3), 0 10px 15px rgba(0,0,0,0.4);
}

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

html, body {
  height: 100%;
  overflow-x: hidden;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.app-header {
  background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 50%, #1a365d 100%);
  color: #fff;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-lg);
  flex-shrink: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.header-content h1 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-content h1 i { font-size: 1.2rem; }

.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.theme-switcher i { opacity: 0.7; transition: opacity var(--transition); }
.dark-theme .theme-switcher .fa-sun { opacity: 1; }
.theme-switcher .fa-moon { opacity: 1; }
.dark-theme .theme-switcher .fa-moon { opacity: 0.7; }

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.3);
  transition: var(--transition);
  border-radius: 24px;
}

.slider:before {
  content: "";
  position: absolute;
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background: #fff;
  transition: var(--transition);
  border-radius: 50%;
}

.switch input:checked + .slider { background: rgba(255,255,255,0.5); }
.switch input:checked + .slider:before { transform: translateX(20px); }

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  gap: 1rem;
  overflow-y: auto;
}

@media (min-width: 768px) {
  .app-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
  }
}

#inputs-column, #outputs-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  min-width: 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem;
  transition: background var(--transition), box-shadow var(--transition);
  border-top: 4px solid var(--primary-color);
}

@media (min-width: 768px) {
  .card { padding: 1.5rem; }
}

.card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-group { margin-bottom: 1rem; }

.input-group label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-color);
  margin-bottom: 0.35rem;
}

.input-group input[type="text"],
.input-group input[type="number"],
.input-group select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--bg-color);
  color: var(--text-color);
  transition: border var(--transition), box-shadow var(--transition);
  outline: none;
}

.input-group input:focus, .input-group select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.input-group input::placeholder { color: var(--text-light); opacity: 0.7; }

.input-group input.valid {
  border-color: var(--success-color);
  box-shadow: 0 0 0 2px rgba(16,185,129,0.2);
}

.input-group input.invalid {
  border-color: var(--error-color);
  box-shadow: 0 0 0 2px rgba(239,68,68,0.2);
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.button-group { display: flex; gap: 0.75rem; margin-top: 1.25rem; }

.main-button, .secondary-button {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.main-button {
  background: linear-gradient(145deg, #0f172a 0%, #1e3a5f 50%, #1a365d 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37,99,235,0.3);
}

.main-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.4);
}

.main-button:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

.secondary-button {
  background: var(--border-color);
  color: var(--text-color);
}

.secondary-button:hover {
  background: var(--text-light);
  color: #fff;
}

.icon-button {
  background: none;
  color: var(--text-light);
  border: none;
  padding: 0.5rem;
  font-size: 1.2rem;
  cursor: pointer;
  transition: color var(--transition);
}

.icon-button:hover { color: var(--primary-color); }

#results-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
}

#results-card .card-header h2 { border: none; margin: 0; padding: 0; }

.header-buttons { display: flex; gap: 0.5rem; }

.result-placeholder {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
  font-size: 1.1rem;
}

.result-placeholder i { font-size: 3rem; margin-bottom: 1rem; display: block; opacity: 0.5; }

.result-content { display: flex; flex-direction: column; gap: 1.5rem; }

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.result-item {
  background: var(--bg-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  display: flex;
  flex-direction: column;
}

.result-item .label {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.result-item .value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-color);
}

.recommended-row {
  background: rgba(16,185,129,0.08);
  border-left: 4px solid var(--success-color);
}

.recommended-badge {
  background: var(--success-color);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 10px;
  margin-left: 8px;
  font-weight: 600;
}

.error-state {
  background: rgba(239,68,68,0.08);
  border: 1px solid var(--error-color);
  border-radius: var(--radius-sm);
}

.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  vertical-align: middle;
}

th {
  background: var(--primary-color);
  color: #fff;
  font-weight: 600;
}

tr:nth-child(even) td {
  background: rgba(0,0,0,0.02);
}

.dark-theme tr:nth-child(even) td {
  background: rgba(255,255,255,0.03);
}

tbody tr:last-child td { border-bottom: none; }

@keyframes fadeInCard {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-content { animation: fadeInCard 0.4s ease; }

@media (max-width: 768px) {
  .app-header { padding: 0.6rem 0.75rem; }
  .header-content h1 { font-size: 1rem; }
  .app-main { padding: 0.75rem; }
  .card { padding: 0.75rem; }
  .input-grid { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
}