/* ===== CSS Variables ===== */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #7c3aed;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Sarabun', 'Prompt', 'Segoe UI', sans-serif;
    background: #f8fafc;
    color: #1e293b;
    line-height: 1.6;
}

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

/* ===== Header & Navigation ===== */
header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: #eef2ff;
}

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

.btn-admin:hover {
    background: var(--primary-dark) !important;
    color: var(--white) !important;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
    border-radius: 0 0 40px 40px;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
}

.hero h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 20px;
    opacity: 0.9;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255,255,255,0.3);
}

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: var(--white);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success);
    color: var(--white);
}
.btn-success:hover { background: #059669; }

.btn-danger {
    background: var(--danger);
    color: var(--white);
}
.btn-danger:hover { background: #dc2626; }

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== Features ===== */
.features {
    padding: 60px 0;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: #1e293b;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--gray);
}

/* ===== Cards & Forms ===== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.card h2 {
    margin-bottom: 20px;
    color: #1e293b;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    padding: 10px 14px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

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

.form-group .full-width {
    grid-column: 1 / -1;
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    background: var(--light-gray);
    color: var(--gray);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.tab-btn:hover {
    background: #e2e8f0;
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ===== Search Box ===== */
.search-box {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.search-box input,
.search-box select {
    flex: 1;
    min-width: 150px;
    padding: 10px 14px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius);
    font-size: 1rem;
}

/* ===== Table ===== */
.table-container {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-top: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

thead {
    background: #f1f5f9;
}

th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    color: #475569;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid #e2e8f0;
}

tr:hover {
    background: #f8fafc;
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.status-waiting { background: #fef3c7; color: #d97706; }
.status-ready { background: #dbeafe; color: #2563eb; }
.status-success { background: #d1fae5; color: #059669; }

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

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

.stat-card i {
    font-size: 2.5rem;
    opacity: 0.9;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Upload Section ===== */
.upload-section {
    margin-top: 30px;
    padding: 25px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 15px;
}

.upload-box {
    padding: 20px;
    border: 2px dashed #e2e8f0;
    border-radius: var(--radius);
    text-align: center;
}

.upload-box input[type="text"] {
    width: 100%;
    padding: 8px 12px;
    margin: 8px 0;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
}

.upload-box input[type="file"] {
    margin: 10px 0;
}

/* ===== Result Box ===== */
.result-box {
    margin-top: 20px;
    padding: 16px 20px;
    border-radius: var(--radius);
}

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

.result-box.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

/* ===== Progress Bar ===== */
.progress-container {
    margin: 15px 0;
    background: #e2e8f0;
    border-radius: 20px;
    overflow: hidden;
    height: 10px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #4f46e5, #7c3aed);
    border-radius: 20px;
    transition: width 0.5s ease;
}

/* ===== Popup ===== */
.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.popup.show {
    display: flex;
}

.popup-content {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    max-width: 500px;
    width: 90%;
    position: relative;
    animation: slideDown 0.3s ease;
}

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

.popup-content .close {
    position: absolute;
    top: 12px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
}

/* ===== Footer ===== */
footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 20px 0;
    text-align: center;
    margin-top: 40px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero h2 { font-size: 1.3rem; }
    .nav-links { gap: 10px; }
    .nav-links a { padding: 6px 12px; font-size: 0.9rem; }
    .form-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .upload-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; align-items: center; }
}