@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Color Palette */
    --primary-color: #4f46e5;
    /* Indigo 600 */
    --primary-hover: #4338ca;
    /* Indigo 700 */
    --secondary-color: #64748b;
    /* Slate 500 */
    --background-color: #f8fafc;
    /* Slate 50 */
    --surface-color: #ffffff;
    --text-main: #0f172a;
    /* Slate 900 */
    --text-muted: #64748b;
    /* Slate 500 */
    --border-color: #e2e8f0;
    /* Slate 200 */
    --error-color: #ef4444;
    /* Red 500 */
    --success-color: #22c55e;
    /* Green 500 */

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    /* Shadows */
    --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);
}
@font-face {
 font-family: 'NanumBarunGothic';
 font-style: normal;
 font-weight: 300;
 src: url('//cdn.jsdelivr.net/font-nanumlight/1.0/NanumBarunGothicWebLight.eot');
 src: url('//cdn.jsdelivr.net/font-nanumlight/1.0/NanumBarunGothicWebLight.eot?#iefix') format('embedded-opentype'), 
 url('//cdn.jsdelivr.net/font-nanumlight/1.0/NanumBarunGothicWebLight.woff') format('woff'), 
 url('//cdn.jsdelivr.net/font-nanumlight/1.0/NanumBarunGothicWebLight.ttf') format('truetype');
}
/* Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'NanumBarunGothic', sans-serif;
    background-color: var(--background-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    font-size: 16px;
    /* Increased base font size for mobile */
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-hover);
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

.text-center {
    text-align: center;
}

.text-sm {
    font-size: 0.875rem;
}

.text-lg {
    font-size: 1.125rem;
}

.font-bold {
    font-weight: 700;
}

.text-muted {
    color: var(--text-muted);
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    /* Larger touch target */
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
    /* Larger font for buttons */
}

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

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

.btn-secondary {
    background-color: white;
    border-color: var(--border-color);
    color: var(--text-main);
}

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

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

.btn-danger:hover {
    opacity: 0.9;
}

.card {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    /* Slightly reduced padding for mobile */
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: 1rem;
    /* Larger label */
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    /* Larger padding for inputs */
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    /* Larger font for inputs */
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Login Page Specifics */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: var(--spacing-md);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Navbar / Header */
.navbar {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 2.0rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-main);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    background-color: var(--background-color);
    color: var(--primary-color);
}

/* Mobile Menu Overlay (Modernized) */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 85%;
    /* Wider menu on mobile */
    max-width: 320px;
    height: 100%;
    background-color: var(--surface-color);
    padding: var(--spacing-lg);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

.mobile-menu-overlay.active .mobile-menu-content {
    transform: translateX(0);
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    overflow-y: auto;
}

.menu-item-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-weight: 600;
    height: 100px;
    transition: all 0.2s;
    font-size: 1rem;
}

.menu-item-btn:hover {
    background-color: #e0e7ff;
    /* Light Indigo */
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Media Queries for Mobile */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .card {
        padding: var(--spacing-md);
    }

    .flex {
        flex-wrap: wrap;
    }

    .flex.justify-between {
        gap: var(--spacing-md);
    }

    /* FullCalendar Mobile Overrides */
    .fc-toolbar {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .fc-toolbar-title {
        font-size: 1.25rem !important;
    }

    .fc .fc-button {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
}