/* Global variables - Modern White & Minimal */
:root {
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-blue: #3b82f6;
    --accent-light: #eff6ff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    background-color: var(--bg-light);
    color: var(--text-primary);
    font-family: 'Inter', 'Pretendard', sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    /* Changed to Top-Bottom layout */
    min-height: 100vh;
}

/* Top Navbar (Replaced Sidebar) */
.top-navbar {
    height: 72px;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-blue);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-right: 40px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-item {
    padding: 10px 18px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.95rem;
}

.nav-item:hover {
    background-color: var(--bg-light);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: var(--accent-light);
    color: var(--accent-blue);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 40px 80px;
    /* Wider padding for horizontal layout */
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

/* Cards */
.card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 14px 16px;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--bg-light);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 18px 16px;
    border-bottom: 1px solid var(--bg-light);
    background-color: transparent;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background-color: #fafbfc;
}

/* Badges & Buttons */
.status-badge {
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
}

.btn {
    background-color: var(--accent-blue);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.2);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 8px -1px rgba(59, 130, 246, 0.3);
}

/* Forms */
.form-input {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}