:root {
  --bg-color: #f5f5f5;
  --card-bg: #ffffff;
  --text-color: #333333;
  --secondary-text: #888888;
  --accent-color: #F5A623;
  --accent-hover: #E0961F;
  --border-color: #e0e0e0;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --radius: 12px;
  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
}

/* Telegram Theme Integration */
body.light {
  --bg-color: #f5f5f5;
  --card-bg: #ffffff;
  --text-color: #000000;
}

body.dark {
  --bg-color: #1c1c1e;
  --card-bg: #2c2c2e;
  --text-color: #ffffff;
  --secondary-text: #8e8e93;
  --border-color: #3a3a3c;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
}

h1, h2, h3 {
  margin: 0 0 16px 0;
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  color: inherit;
}

.card:active {
  transform: scale(0.98);
}

.card-icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
}

.calculator-page {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 16px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--secondary-text);
  font-weight: 500;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

input[type="number"], select {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-sizing: border-box;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: border-color 0.2s;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
}

.input-suffix {
  position: absolute;
  right: 12px;
  color: var(--secondary-text);
  font-size: 14px;
  pointer-events: none;
}

input[type="number"] {
    -moz-appearance: textfield;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}


.btn-calculate {
  width: 100%;
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 14px;
  font-size: 16px;
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 8px;
  transition: background-color 0.2s;
}

.btn-calculate:active {
  background-color: var(--accent-hover);
  transform: translateY(1px);
}

.result-section {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.result-item {
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.result-label {
  font-size: 14px;
  color: var(--secondary-text);
}

.result-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-color);
}

.result-value.large {
  font-size: 28px;
  display: block;
  margin-top: 4px;
}

.note {
  font-size: 12px;
  color: var(--secondary-text);
  margin-top: 8px;
  font-style: italic;
}