/* ============================================
   Fuel Station Management System - Stylesheet
   ============================================ */

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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #16a085;
    --light-bg: #ecf0f1;
    --border-color: #bdc3c7;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f6fa;
    color: var(--text-color);
    line-height: 1.6;
}

/* ============================================
   Layout & Container
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 15px;
    margin-bottom: 30px;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
    margin-top: 20px;
}

h4 {
    font-size: 1.2rem;
}

p {
    margin-bottom: 10px;
}

/* ============================================
   Forms
   ============================================ */

.form {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

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

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary-color);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="date"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

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

input[readonly] {
    background-color: #f8f9fa;
    cursor: not-allowed;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

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

.btn-secondary:hover {
    background-color: #6c7a7d;
}

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

.btn-success:hover {
    background-color: #229954;
}

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

.btn-danger:hover {
    background-color: #c0392b;
}

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

.btn-info:hover {
    background-color: #138d75;
}

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

.btn-search:hover {
    background-color: #2980b9;
}

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

.btn-reset:hover {
    background-color: #d68910;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
    margin-bottom: 20px;
}

/* ============================================
   Tables
   ============================================ */

.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

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

.table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--light-bg);
}

.table tbody tr:hover {
    background-color: #f8f9fa;
}

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

.table-edit {
    width: 100%;
    border-collapse: collapse;
    background: white;
    margin-bottom: 15px;
}

.table-edit thead {
    background-color: var(--primary-color);
    color: white;
}

.table-edit th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.table-edit td {
    padding: 10px;
    border-bottom: 1px solid var(--light-bg);
}

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

/* ============================================
   Alerts
   ============================================ */

.alert {
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #27ae60;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #e74c3c;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-color: #f39c12;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #16a085;
}

/* ============================================
   Search Box
   ============================================ */

.search-box {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.search-box form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.search-box input {
    flex: 1;
    min-width: 250px;
}

/* ============================================
   Dashboard
   ============================================ */

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

.dashboard-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
}

.dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.dashboard-card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.dashboard-card .value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 10px 0;
}

.dashboard-card a {
    display: inline-block;
    margin-top: 10px;
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.dashboard-card a:hover {
    text-decoration: underline;
}

/* ============================================
   Invoice Container
   ============================================ */

.invoice-container {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.invoice-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--light-bg);
}

.station-info h2 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.station-info p {
    margin-bottom: 8px;
    color: var(--text-light);
}

.invoice-meta {
    text-align: right;
}

.invoice-meta h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.customer-info {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 4px;
    margin-bottom: 30px;
}

.customer-info h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.customer-info p {
    margin-bottom: 8px;
}

.invoice-items {
    margin-bottom: 30px;
}

.invoice-total {
    text-align: right;
    padding: 20px;
    background-color: var(--light-bg);
    border-radius: 4px;
    margin-bottom: 20px;
}

.invoice-total h4 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.invoice-footer {
    text-align: center;
    padding-top: 20px;
    border-top: 2px solid var(--light-bg);
    color: var(--text-light);
}

/* ============================================
   Report Summary
   ============================================ */

.report-summary {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 4px solid var(--secondary-color);
}

.report-summary h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.report-summary p {
    margin-bottom: 10px;
}

.report-summary hr {
    margin: 15px 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Form Section
   ============================================ */

.form-section {
    margin-bottom: 30px;
}

.form-section h3 {
    margin-top: 0;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* ============================================
   No Data Message
   ============================================ */

.no-data {
    text-align: center;
    padding: 40px 20px;
    background-color: var(--light-bg);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 1.1rem;
}

.no-data a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.no-data a:hover {
    text-decoration: underline;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    .form {
        padding: 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .button-group .btn {
        width: 100%;
    }

    .invoice-header {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .invoice-meta {
        text-align: left;
    }

    .table {
        font-size: 0.9rem;
    }

    .table th,
    .table td {
        padding: 10px;
    }

    .search-box form {
        flex-direction: column;
    }

    .search-box input {
        min-width: 100%;
    }

    .dashboard {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .invoice-container {
        padding: 20px;
    }

    .table {
        font-size: 0.85rem;
    }

    .table th,
    .table td {
        padding: 8px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    body {
        background-color: white;
    }

    .no-print {
        display: none !important;
    }

    .invoice-container,
    .report-summary,
    .table {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .button-group {
        display: none;
    }

    h1 {
        page-break-after: avoid;
    }

    table {
        page-break-inside: avoid;
    }
}