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

:root {
    --primary-color: #780524;
    --primary-dark: #edc484;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 8px;
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--background-color) 0%, #e0f2fe 100%);
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 100;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hamburger {
    display: block;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.nav-group .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    padding: 0.5rem;
    border-radius: 8px;
    min-width: 150px;
    z-index: 10;
    box-shadow: var(--shadow);
}

.nav-links a {
    display: block;
    padding: 0.5rem;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.2s;
}

.nav-links a:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-group.open .nav-links {
    display: block;
}

.dropdown-toggle {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    padding: 0;
    font-size: 0.75rem;
    position: relative;
}

.dropdown-toggle::after {
    content: '▼';
    margin-left: 0.5rem;
    transition: transform 0.3s ease;
}

.nav-group.open .dropdown-toggle::after {
    transform: rotate(180deg);
}

/* Grouped Navigation Styles */
nav, #nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem;
    border-radius: 8px;
}

.nav-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    position: relative;
}

.nav-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.nav-group a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    position: relative;
}

.nav-group a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.nav-group a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
    transform: translateX(-50%);
}

.nav-group a:hover::after {
    width: 80%;
}

/* Responsive navigation */
@media (max-width: 1024px) {
    nav, #nav {
        gap: 1rem;
    }
    
    .nav-group a {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    #nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--primary-color);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow);
        z-index: 99;
    }
    
    #nav.nav--open {
        display: flex;
    }
    
    .nav-group {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding: 0.5rem 0;
        margin-bottom: 0;
    }
    
    .nav-group:last-child {
        border-bottom: none;
    }
    
    .nav-label {
        margin-bottom: 0.5rem;
        margin-right: 0;
    }
    
    .nav-group a {
        width: 100%;
        text-align: left;
        padding: 0.5rem 0;
    }
    
    .nav-group .nav-links {
        position: static;
        background: none;
        padding: 0;
        min-width: auto;
    }
}

@media (min-width: 769px) {
    #nav.nav--open {
        display: none;
    }
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-container {
    max-width: 400px;
    margin: 5rem auto;
    padding: 2.5rem;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-container h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-weight: 600;
}

.login-container .logo {
    display: block;
    margin: 0 auto 1rem;
    max-width: 150px;
    height: auto;
}

input, button, select, textarea {
    font-family: inherit;
    font-size: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    transition: var(--transition);
    background: var(--surface-color);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

button:active {
    transform: translateY(0);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.875rem;
}

tbody tr:hover {
    background-color: rgba(37, 99, 235, 0.02);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

select, input[type="text"], input[type="number"], input[type="date"], input[type="email"], textarea {
    width: 100%;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    nav {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .nav-group {
        flex-direction: row;
        justify-content: center;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding-bottom: 0.5rem;
        margin-bottom: 0.5rem;
    }

    .nav-group:last-child {
        border-bottom: none;
        margin-bottom: 0;
    }

    .nav-label {
        margin-right: 0.5rem;
        margin-bottom: 0;
        min-width: 60px;
    }

    .nav-group a {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }

    main {
        padding: 1rem;
    }

    .login-container {
        margin: 2rem auto;
        padding: 2rem;
    }

    table {
        font-size: 0.875rem;
    }

    th, td {
        padding: 0.75rem 0.5rem;
    }
}

@media (max-width: 480px) {
    nav {
        flex-direction: column;
        align-items: center;
    }

    nav a {
        width: 100%;
        text-align: center;
        margin: 0.25rem 0;
    }

    .login-container {
        margin: 1rem;
        padding: 1.5rem;
    }
}

/* Utility Classes */
.btn-secondary {
    background: var(--secondary-color);
}

.btn-secondary:hover {
    background: #475569;
}

.card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.guest-item, .room-item {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--surface-color);
}

.guest-item:hover, .room-item:hover {
    background-color: rgba(37, 99, 235, 0.05);
    border-color: var(--primary-color);
}

.selected {
    background-color: rgba(37, 99, 235, 0.1);
    border-color: var(--primary-color);
}

.table-responsive,
.table-container {
    width: 100%;
    overflow-x: auto;
}

table {
    min-width: 680px;
}

.action-buttons,
.form-row {
    display: grid;
    gap: 1rem;
}

.action-btn,
.btn {
    width: auto;
}

@media (max-width: 1024px) {
    .form-row {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }
}

@media (max-width: 768px) {
    .action-buttons {
        grid-template-columns: 1fr;
    }

    .action-btn,
    .btn {
        width: 100%;
    }

    table,
    .table-responsive,
    .table-container {
        min-width: 0;
    }
}