/* Font Import (Kanit for Thai) */
@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600&display=swap');

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --success: #22c55e;
    --danger: #ef4444;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #334155;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius: 16px;
}

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

body {
    font-family: 'Kanit', sans-serif;
    background: linear-gradient(135deg, #eef2ff 0%, #fae8ff 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

/* Card Style */
.card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 1.8rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--secondary);
    font-size: 0.95rem;
}

/* Form Groups */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.85rem 1rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
    background: #fff;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.form-text {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Custom File Upload */
.file-upload-wrapper {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.2s;
    background: #fdfdfd;
    cursor: pointer;
}

.file-upload-wrapper:hover {
    border-color: var(--primary);
    background: #eff6ff;
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-preview {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.preview-item {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--border);
}

/* Captcha */
.captcha-box {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1rem;
}

.captcha-img {
    height: 50px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.btn-refresh {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary);
    font-size: 1.2rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 0.85rem 1.5rem;
    border-radius: 12px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    width: 100%;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--text-main);
    border: 2px solid var(--border);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fcd34d;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #34d399;
    text-align: center;
    padding: 2rem;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #60a5fa;
}

/* Responsive */
@media (max-width: 480px) {
    .card {
        padding: 1.5rem;
    }
}