/* =====================================================
   ระบบลงทะเบียนเรียนซ้ำภาคฤดูร้อน
   โรงเรียนแก่นนครวิทยาลัย
   ===================================================== */

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

:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --primary-dark: #0e3651;
    --accent: #e74c3c;
    --accent-light: #ff6b6b;
    --success: #27ae60;
    --success-light: #2ecc71;
    --warning: #f39c12;
    --warning-light: #f1c40f;
    --info: #3498db;
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --border: #dfe6e9;
    --shadow: 0 2px 15px rgba(0,0,0,0.08);
    --shadow-hover: 0 5px 25px rgba(0,0,0,0.15);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Sarabun', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Login Page ===== */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-wrapper::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
    top: -200px;
    right: -200px;
}

.login-wrapper::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.02);
    border-radius: 50%;
    bottom: -100px;
    left: -100px;
}

.login-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
}

.login-card .school-logo {
    text-align: center;
    margin-bottom: 24px;
}

.login-card .school-logo img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 3px solid var(--primary);
}

.login-card .school-logo .icon-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 36px;
    color: #fff;
}

.login-card h2 {
    font-family: 'Prompt', sans-serif;
    text-align: center;
    color: var(--primary);
    font-size: 1.4rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #fafbfc;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-light);
    outline: none;
    box-shadow: 0 0 0 3px rgba(41,128,185,0.15);
    background: #fff;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(26,82,118,0.3);
}

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: var(--success-light); transform: translateY(-1px); }

.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: var(--warning-light); transform: translateY(-1px); }

.btn-danger { background: var(--accent); color: #fff; }
.btn-danger:hover { background: var(--accent-light); transform: translateY(-1px); }

.btn-info { background: var(--info); color: #fff; }
.btn-info:hover { opacity: 0.9; transform: translateY(-1px); }

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-sm { padding: 8px 16px; font-size: 0.9rem; }
.btn-lg { padding: 14px 32px; font-size: 1.1rem; }

/* ===== Layout ===== */
.navbar {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .brand {
    font-family: 'Prompt', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar .brand .icon {
    font-size: 1.4rem;
}

.navbar .user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.95rem;
}

.navbar .user-info .user-name {
    opacity: 0.9;
}

.navbar .btn-logout {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.3);
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'Sarabun', sans-serif;
    text-decoration: none;
}

.navbar .btn-logout:hover {
    background: rgba(255,255,255,0.25);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* ===== Cards ===== */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 24px;
    transition: box-shadow 0.3s;
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.card-header {
    font-family: 'Prompt', sans-serif;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary);
    padding-bottom: 16px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--bg);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== Registration Form Table ===== */
.reg-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.reg-table th {
    background: var(--primary);
    color: #fff;
    padding: 12px 10px;
    font-weight: 500;
    text-align: center;
    font-size: 0.85rem;
}

.reg-table th:first-child { border-radius: 8px 0 0 0; }
.reg-table th:last-child { border-radius: 0 8px 0 0; }

.reg-table td {
    padding: 8px 6px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.reg-table tr:hover td {
    background: #f8fafc;
}

.reg-table select,
.reg-table input {
    width: 100%;
    padding: 8px 10px;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    font-family: 'Sarabun', sans-serif;
    font-size: 0.85rem;
    transition: border-color 0.3s;
}

.reg-table select:focus,
.reg-table input:focus {
    border-color: var(--primary-light);
    outline: none;
}

.subject-display {
    padding: 8px 10px;
    background: #eaf2f8;
    border-radius: 6px;
    font-size: 0.85rem;
    min-height: 36px;
    display: flex;
    align-items: center;
    color: var(--primary-dark);
    font-weight: 500;
}

/* ===== Credit Counter ===== */
.credit-counter {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #eaf2f8, #d4e6f1);
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    margin-top: 16px;
}

.credit-counter .label {
    font-weight: 600;
    color: var(--primary);
}

.credit-counter .value {
    font-family: 'Prompt', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
}

.credit-counter .value.ok { color: var(--success); }
.credit-counter .value.over { color: var(--accent); }

.credit-counter .max {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== Alerts ===== */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-danger { background: #fdecea; color: #c0392b; border-left: 4px solid #e74c3c; }
.alert-success { background: #eafaf1; color: #1e8449; border-left: 4px solid #27ae60; }
.alert-warning { background: #fef9e7; color: #9a7d0a; border-left: 4px solid #f39c12; }
.alert-info { background: #ebf5fb; color: #1a5276; border-left: 4px solid #3498db; }

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

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary);
}

.stat-card.success { border-top-color: var(--success); }
.stat-card.warning { border-top-color: var(--warning); }
.stat-card.danger { border-top-color: var(--accent); }
.stat-card.info { border-top-color: var(--info); }

.stat-card .stat-number {
    font-family: 'Prompt', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-card.success .stat-number { color: var(--success); }
.stat-card.warning .stat-number { color: var(--warning); }
.stat-card.danger .stat-number { color: var(--accent); }

.stat-card .stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== Timeline ===== */
.timeline {
    display: flex;
    align-items: center;
    gap: 0;
    font-size: 0.8rem;
}

.timeline-step {
    display: flex;
    align-items: center;
    gap: 6px;
}

.timeline-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #fff;
    flex-shrink: 0;
}

.timeline-dot.active { background: var(--success); }
.timeline-dot.pending { background: var(--border); }

.timeline-line {
    width: 30px;
    height: 2px;
    background: var(--border);
    margin: 0 4px;
}

.timeline-line.active { background: var(--success); }

.timeline-text {
    font-size: 0.75rem;
    color: var(--text-light);
    white-space: nowrap;
}

.timeline-text.active {
    color: var(--success);
    font-weight: 600;
}

/* ===== Table ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th {
    background: var(--primary);
    color: #fff;
    padding: 12px 16px;
    font-weight: 500;
    text-align: left;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.data-table tr:hover td {
    background: #f8fafc;
}

/* ===== Badge ===== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-registered { background: #ebf5fb; color: var(--info); }
.badge-received { background: #fef9e7; color: var(--warning); }
.badge-completed { background: #eafaf1; color: var(--success); }

/* ===== Actions ===== */
.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

/* ===== Tab Navigation ===== */
.tab-nav {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--border);
    margin-bottom: 24px;
}

.tab-nav a {
    padding: 10px 20px;
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all 0.3s;
}

.tab-nav a:hover { color: var(--primary); }
.tab-nav a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

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

.search-box input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
}

.search-box input:focus {
    border-color: var(--primary-light);
    outline: none;
}

/* ===== Print Styles ===== */
@media print {
    .navbar, .btn, .action-buttons, .no-print { display: none !important; }
    body { background: #fff; }
    .container { padding: 0; max-width: 100%; }
    .card { box-shadow: none; border: 1px solid #ccc; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar { padding: 0 15px; }
    .container { padding: 15px 10px; }
    .reg-table { font-size: 0.8rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .login-card { padding: 30px 20px; }
}

/* ===== File Upload ===== */
.file-upload {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

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

.file-upload input[type="file"] {
    display: none;
}

/* ===== Misc ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-10 { gap: 10px; }