/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --border-color: #e2e8f0;
    --text-color: #334155;
    --text-light: #64748b;
    --white: #ffffff;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: var(--white);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    color: var(--dark-color);
    font-size: 24px;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-light);
    font-size: 14px;
}

.login-form {
    margin-top: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

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

.login-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 12px;
    color: var(--text-light);
}

/* Header */
.main-header {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    max-width: 200px;
    object-fit: contain;
}

.logo h1 {
    font-size: 20px;
    color: var(--dark-color);
    margin: 0;
}

.main-nav {
    display: flex;
    gap: 30px;
    margin-left: 50px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-left: auto;
}

.user-menu span {
    color: var(--text-color);
    font-weight: 500;
}

/* Hamburger Menu */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 101;
}

.hamburger-menu span {
    width: 100%;
    height: 3px;
    background-color: var(--text-color);
    border-radius: 3px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px 20px;
}

.page-header {
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 32px;
    color: var(--dark-color);
    margin-bottom: 8px;
}

.page-header p {
    color: var(--text-light);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    text-align: center;
}

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

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
}

.stat-icon {
    font-size: 48px;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 12px;
}

.stat-content h3 {
    font-size: 32px;
    color: var(--dark-color);
    margin-bottom: 4px;
}

.stat-content p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 8px;
}

.stat-details {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--text-light);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 20px;
}

.dashboard-card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 18px;
    color: var(--dark-color);
}

.card-body {
    padding: 20px;
}

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

.data-table thead {
    background-color: var(--light-color);
}

.data-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
}

.data-table tbody tr:hover {
    background-color: var(--light-color);
}

.data-table a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.data-table a:hover {
    text-decoration: underline;
    color: var(--primary-dark);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-draft {
    background-color: #e0e7ff;
    color: #3730a3;
}

.badge-sent {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-accepted,
.badge-paid {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-rejected,
.badge-overdue {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-pending {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-in_progress {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-completed {
    background-color: #d1fae5;
    color: #065f46;
}

/* Forms */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

/* Items Table */
.items-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.items-table th,
.items-table td {
    padding: 10px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.items-table th {
    background-color: var(--light-color);
    font-weight: 600;
}

.items-table input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.btn-remove {
    background-color: var(--danger-color);
    color: var(--white);
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* Footer */
.main-footer {
    background: var(--white);
    border-top: 1px solid var(--border-color);
    padding: 20px;
    margin-top: 50px;
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

.footer-content p {
    margin: 5px 0;
}

/* Print Styles */
@media print {
    .main-header,
    .main-footer,
    .form-actions,
    .btn {
        display: none;
    }
    
    body {
        background: white;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
}

/* Responsive */
@media (max-width: 1279px) {
    .hamburger-menu {
        display: flex;
        order: 3;
    }
    
    .header-content {
        position: relative;
    }
    
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: 0;
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        z-index: 100;
    }
    
    .main-nav.active {
        display: flex;
        max-height: 500px;
        padding: 10px 0;
    }
    
    .main-nav a {
        display: block;
        padding: 12px 20px;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        text-align: left;
    }
    
    .main-nav a:last-child {
        border-bottom: none;
    }
    
    .user-menu {
        order: 2;
        margin-left: auto;
        margin-right: 15px;
    }
    
    .hamburger-menu {
        margin-left: 10px;
    }
}

@media (max-width: 768px) {
    .header-content {
        height: 70px;
        padding: 0 15px;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}