:root {
  --main: #4a90e2;
  --accent: #50e3c2;
  --bg: #f0f2f5;
  --card: #ffffff;
  --text: #333333;
  --sub: #666666;
  --border: #e0e0e0;
  --highlight: #fff3b0;
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --error-color: #e74c3c;
}

[data-theme="dark"] {
  --main: #7aa8e2;
  --accent: #50e3c2;
  --bg: #282c34;
  --card: #3a404a;
  --text: #e0e0e0;
  --sub: #a0a0a0;
  --border: #4a505a;
  --highlight: #a0a000;
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  --error-color: #e74c3c;
}

html,
body {
  background: var(--bg);
  color: var(--text);
  margin: 0;
  line-height: 1.6;
}

body {
  font-family: "Pretendard", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 720px;
  margin: 40px auto;
  padding: 0 20px;
}

.theme-toggle {
  float: right;
  margin-top: 10px;
  cursor: pointer;
  color: var(--main);
  background: none;
  border: none;
  font-size: 1.5em;
  transition: color 0.3s ease;
  outline: none;
}

.theme-toggle:hover {
  color: var(--accent);
  transform: scale(1.1);
}

h2 {
  text-align: center;
  color: var(--main);
  margin-bottom: 30px;
  font-size: 2.2em;
  font-weight: 700;
}

.card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 35px;
  margin-bottom: 30px;
  border: 1px solid var(--border);
  transition: background 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

.tab-bar {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 30px;
  background: var(--bg);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  overflow: hidden;
}

.tab-btn {
  flex: 1;
  padding: 16px 0;
  background: var(--bg);
  border: none;
  border-bottom: 3px solid transparent;
  font-size: 1.1em;
  color: var(--sub);
  font-weight: 600;
  cursor: pointer;
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
  outline: none;
}

.tab-btn:hover:not(.active) {
  background: var(--border);
  color: var(--main);
}

.tab-btn.active {
  color: var(--main);
  border-bottom: 3px solid var(--main);
  background: var(--card);
}

.tab-content {
  display: none;
  animation: fadeIn 0.6s ease-out;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.input-group {
  display: flex;
  flex-wrap: wrap;
  gap: 25px;
  margin-bottom: 20px;
}

.input-field {
  display: flex;
  flex-direction: column;
  min-width: 150px;
  flex: 1 1 150px;
}

label {
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--sub);
  font-size: 1em;
}

input[type="number"],
input[type="text"],
select {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.05em;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

input:focus,
select:focus {
  border-color: var(--main);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
  outline: none;
  background: var(--card);
}

select {
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 18px;
  padding-right: 30px;
}

.preset-btns {
  margin: 15px 0 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.preset-btns span {
  font-weight: 500;
  color: var(--sub);
  margin-right: 5px;
  font-size: 1em;
}

.preset-btns button {
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--main);
  cursor: pointer;
  font-size: 1em;
  font-weight: 500;
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease,
    transform 0.2s ease;
  outline: none;
}

.preset-btns button:hover {
  background: var(--main);
  color: #fff;
  border-color: var(--main);
  transform: translateY(-2px);
}

.error {
  color: var(--error-color);
  margin-top: 12px;
  font-size: 0.95em;
}

.result-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: 30px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.result-table thead {
  background: var(--main);
  color: #ffffff;
}

.result-table th,
.result-table td {
  border: none;
  padding: 14px 18px;
  text-align: right;
}

.result-table th:first-child {
  text-align: left;
}

.result-table tbody tr:nth-child(even) {
  background: var(--bg);
}

.result-table tbody tr:hover {
  background: var(--border);
}

.highlight {
  color: var(--accent);
  font-weight: bold;
  font-size: 1.2em;
}

.highlight.negative {
  color: var(--error-color);
}

.result {
  margin-top: 25px;
  font-weight: bold;
  font-size: 1.15em;
  color: var(--main);
}

.subtext {
  color: var(--sub);
  font-size: 0.95em;
  margin-top: 12px;
  line-height: 1.5;
}

.icon-tip {
  color: var(--sub);
  margin-left: 5px;
  cursor: help;
  transition: color 0.3s ease;
}

.icon-tip:hover {
  color: var(--main);
}

.chart-card {
  margin-top: 30px;
  background: var(--card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: 25px;
  border: 1px solid var(--border);
}

@media (max-width: 768px) {
  .container {
    margin: 30px auto;
    padding: 0 18px;
  }
  h2 {
    font-size: 2em;
    margin-bottom: 25px;
  }
  .card {
    padding: 30px 25px;
  }
  .tab-btn {
    font-size: 1.05em;
    padding: 14px 0;
  }
  .input-group {
    gap: 20px;
  }
  label {
    font-size: 0.95em;
  }
  input[type="number"],
  input[type="text"],
  select {
    font-size: 1em;
    padding: 11px 13px;
  }
  .preset-btns {
    gap: 10px;
  }
  .preset-btns button {
    padding: 8px 18px;
    font-size: 0.95em;
  }
  .result-table th,
  .result-table td {
    font-size: 0.9em;
    padding: 12px 15px;
  }
  .highlight {
    font-size: 1.15em;
  }
  .result {
    font-size: 1.1em;
  }
  .subtext {
    font-size: 0.9em;
  }
  .chart-card {
    padding: 22px;
  }
}

@media (max-width: 600px) {
  .container {
    margin: 20px auto;
    padding: 0 15px;
  }
  h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
  }
  .card {
    padding: 25px 20px;
  }
  .tab-btn {
    font-size: 0.95em;
    padding: 12px 0;
  }
  .input-group {
    flex-direction: column;
    gap: 12px;
  }
  label {
    font-size: 0.85em;
  }
  input[type="number"],
  input[type="text"],
  select {
    font-size: 0.9em;
    padding: 9px 10px;
  }
  .preset-btns {
    gap: 8px;
  }
  .preset-btns button {
    padding: 7px 15px;
    font-size: 0.9em;
  }
  .result-table th,
  .result-table td {
    font-size: 0.8em;
    padding: 10px 8px;
  }
  .highlight {
    font-size: 1.05em;
  }
  .result {
    margin-top: 18px;
    font-size: 1em;
  }
  .subtext {
    font-size: 0.8em;
  }
  .chart-card {
    padding: 18px;
  }
}

.app-footer {
  text-align: center;
  margin-top: 50px;
  padding: 25px 20px;
  font-size: 0.85em;
  color: var(--sub);
  background: var(--card);
  border-top: 1px solid var(--border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.05);
}

.app-footer .creator-info a {
  color: var(--main);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.app-footer .creator-info a:hover {
  text-decoration: underline;
  color: var(--accent);
}

.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--main);
  color: white;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
  outline: none;
  gap: 8px;
}

.primary-btn:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#profitRateInputsContainer {
  margin-bottom: 20px;
}

.profit-rate-input-row {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
  align-items: flex-end;
}

.profit-rate-input-row .input-field {
  flex: 1;
  min-width: unset;
}

.remove-btn {
  background: none;
  color: var(--error-color);
  border: 1px solid var(--error-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 1em;
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.remove-btn:hover {
  background: var(--error-color);
  color: white;
}

#individualResultsList {
  list-style: none;
  padding: 0;
  margin-top: 10px;
}

#individualResultsList li {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 15px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95em;
}

#individualResultsList li span:first-child {
  font-weight: 500;
  color: var(--main);
}

#individualResultsList li span:last-child {
  font-weight: bold;
  color: var(--text);
}

#overallProfitRateResult {
  margin-top: 25px;
  padding: 15px;
  background: var(--main);
  color: white;
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 1.2em;
  font-weight: 700;
  box-shadow: var(--shadow);
}

#overallProfitRateResult h3 {
  color: white;
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.1em;
}

#overallResultText {
  margin: 0;
}