:root {
    /* Pastel Palette */
    --primary-color: #FFB7B2;
    /* Pastel Red/Pink */
    --primary-dark: #FF9E99;
    --secondary-color: #B5EAD7;
    /* Pastel Green */
    --accent-color: #C7CEEA;
    /* Pastel Purple/Blue */
    --warning-color: #FFDAC1;
    /* Pastel Orange */
    --text-color: #555;
    --bg-color: #FDF9F3;
    /* Warm White */
    --card-bg: #FFFFFF;
    --border-radius: 16px;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    --font-heading: 'Gaegu', cursive;
    --font-body: 'Noto Sans KR', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 700;
}

.app-container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 20px;
}

/* ... existing styles ... */

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 10px;
    /* Uniform padding */
    border: 2px solid #eee;
    border-radius: 10px;
}

.main-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

.main-header h1 {
    font-size: 3rem;
    color: var(--primary-dark);
    margin-bottom: 5px;
}

.main-header p {
    color: #888;
}

/* Navigation */
.main-nav {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.nav-btn {
    background: white;
    border: 2px solid transparent;
    border-radius: 50px;
    padding: 12px 24px;
    font-family: var(--font-heading);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    color: var(--text-color);
}

.nav-btn:hover {
    transform: translateY(-2px);
    border-color: var(--secondary-color);
}

.nav-btn.active {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    border: 1px solid #f0f0f0;
}

/* Tabs */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

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

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons */
.btn {
    border: none;
    border-radius: 12px;
    padding: 10px 20px;
    font-family: var(--font-body);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background-color: var(--primary-dark);
}

.btn.secondary {
    background-color: var(--secondary-color);
    color: #444;
}

.btn.secondary:hover {
    background-color: #a3e2cc;
}

.btn.error {
    background-color: #ffb7b2;
    color: crimson;
}

.btn.small {
    padding: 6px 12px;
    font-size: 0.9rem;
}

.full-width {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

/* Upload Area */
.upload-area {
    border: 3px dashed var(--accent-color);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: background 0.3s;
    margin: 20px 0;
    background: #fdfdfd;
}

.upload-area:hover {
    background-color: #f7f9ff;
}

.upload-area i {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 10px;
}

/* Table */
.table-container {
    overflow-x: auto;
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th,
td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #fafafa;
    color: #666;
    font-weight: 600;
    white-space: nowrap;
}

input.table-input {
    width: 100%;
    border: 1px solid #ddd;
    padding: 5px;
}

/* Chart */
.chart-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.chart-wrapper {
    width: 200px;
    height: 200px;
    position: relative;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #ccc;
    cursor: pointer;
}

.icon-btn:hover {
    color: var(--text-color);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
}

@media (max-width: 800px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

.chart-label {
    text-align: center;
    font-weight: bold;
    margin-top: 10px;
}

/* Utilities */
.hidden {
    display: none !important;
}

.items-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.summary-area {
    text-align: right;
    font-size: 1.2rem;
    margin: 20px 0;
    padding: 15px;
    background: #f9f9f9;
    border-radius: 10px;
}

.input-group {
    display: flex;
    gap: 10px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    font-size: 1.5rem;
    color: var(--primary-dark);
}