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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #0ea5e9;
    --dark: #1e293b;
    --light: #f1f5f9;
    --white: #ffffff;
    --font-main: 'Sarabun', 'TH Sarabun New', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background: #f8fafc;
    color: #334155;
    line-height: 1.6;
}

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

/* Header */
.main-header {
    background: linear-gradient(135deg, var(--dark) 0%, #0f172a 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 700;
}

.logo i {
    font-size: 28px;
    color: var(--primary);
}

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

.main-nav a {
    color: #94a3b8;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav a:hover,
.main-nav a.active {
    color: white;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.hero h1 {
    font-size: 36px;
    margin-bottom: 15px;
    font-weight: 700;
}

.hero p {
    font-size: 18px;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    padding: 40px 0;
}

.grid-2 {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

/* Cards */
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 25px;
}

.card-header {
    padding: 25px;
    border-bottom: 1px solid #e2e8f0;
}

.card-header h2,
.card-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #1e293b;
}

.card-body {
    padding: 25px;
}

/* Form Styles */
.form-section {
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 1px solid #e2e8f0;
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #475569;
}

.required {
    color: var(--danger);
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 16px;
    font-family: var(--font-main);
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 45px;
}

/* File Upload */
.file-input {
    display: none;
}

.file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 40px;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.file-label:hover {
    border-color: var(--primary);
    background: #f8fafc;
}

.file-label i {
    font-size: 48px;
    color: var(--primary);
}

.file-label span {
    font-size: 16px;
    color: #475569;
}

.file-label small {
    color: #94a3b8;
}

.file-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

/* Buttons */
.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    padding-top: 20px;
    border-top: 2px solid #e2e8f0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 25px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.mt-3 {
    margin-top: 15px;
}

/* Alerts */
.alert {
    padding: 18px 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning);
}

/* Sidebar */
.sidebar .card {
    margin-bottom: 20px;
}

.sidebar .card-header {
    padding: 20px;
    background: #f8fafc;
}

.sidebar .card-header h3 {
    font-size: 16px;
}

.sidebar .card-body {
    padding: 20px;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: #f8fafc;
    border-radius: 10px;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: #1e293b;
}

.stat-number.text-warning { color: var(--warning); }
.stat-number.text-info { color: var(--info); }
.stat-number.text-success { color: var(--success); }

.stat-label {
    font-size: 14px;
    color: #64748b;
}

/* Recent List */
.recent-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.recent-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
    background: #f8fafc;
    border-radius: 10px;
}

.recent-code {
    font-family: monospace;
    font-weight: 600;
    color: var(--primary);
    font-size: 13px;
}

.recent-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.recent-name {
    font-weight: 500;
    color: #1e293b;
}

.recent-equipment {
    font-size: 13px;
    color: #64748b;
}

/* Footer */
.main-footer {
    background: var(--dark);
    color: #94a3b8;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}

/* Responsive */
@media (max-width: 1024px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .main-nav {
        gap: 20px;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Badges */
.badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: white;
}

/* Tables */
.data-table {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

th {
    background: #f8fafc;
    font-weight: 600;
    color: #475569;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tr:hover {
    background: #f8fafc;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }

.hidden { display: none; }
.visible { display: block; }

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f4f6;
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}