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

:root {
    --green-900: #0b3b2e;
    --green-700: #0f766e;
    --blue-900: #0b4f3f;
    --blue-700: #10b981;
    --blue-100: #ecfdf5;
    --cyan-400: #34d399;
    --yellow-700: #34d399;
    --pink-400: #10b981;
    --slate-900: #1f2937;
    --slate-700: #374151;
    --slate-500: #6b7280;
    --surface: #ffffff;
    --surface-soft: #f7f9fb;
    --border: #d8dee6;
    --shadow: rgba(5, 150, 105, 0.18);
}

body {
    font-family: 'Kanit', sans-serif;
    background: linear-gradient(135deg, #ecfdf5 0%, #e6fffa 50%, #f0fdf4 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--slate-900);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: 20px;
    box-shadow: 0 24px 60px var(--shadow);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 55%, var(--blue-700) 100%);
    color: white;
    padding: 30px 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2em;
    margin-bottom: 5px;
    opacity: 0.95;
}

.description {
    font-size: 1em;
    opacity: 0.85;
    margin-bottom: 20px;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

.panel {
    background: var(--surface-soft);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.08);
    border: 1px solid #eef1f5;
}

.panel h2 {
    color: var(--green-900);
    margin-bottom: 20px;
    font-size: 1.5em;
    border-bottom: 3px solid var(--cyan-400);
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--slate-700);
    font-size: 1em;
}

.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1em;
    background: white;
    color: var(--slate-900);
    transition: all 0.3s ease;
    cursor: pointer;
}

.form-group select:hover {
    border-color: var(--green-700);
}

.form-group select:focus {
    outline: none;
    border-color: var(--green-700);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
}

.form-group input[type="text"],
.form-input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1em;
    background: white;
    color: var(--slate-900);
    transition: all 0.3s ease;
    font-family: 'Kanit', sans-serif;
}

.form-group input[type="text"]:hover,
.form-input:hover {
    border-color: var(--green-700);
}

.form-group input[type="text"]:focus,
.form-input:focus {
    outline: none;
    border-color: var(--green-700);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
}

.example-text {
    display: block;
    margin-top: 6px;
    font-size: 0.85em;
    color: var(--slate-500);
    font-style: italic;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
}

#educationLevelGroup {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.checkbox-item:hover {
    border-color: var(--green-700);
    background: var(--blue-100);
}

.checkbox-item input[type="checkbox"],
.checkbox-item input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    cursor: pointer;
    accent-color: var(--green-700);
}

.checkbox-item label {
    margin: 0;
    cursor: pointer;
    flex: 1;
    font-weight: normal;
    color: var(--slate-700);
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--green-700) 0%, var(--blue-700) 55%, var(--cyan-400) 100%);
    color: white;
    flex: 1;
    justify-content: center;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 22px rgba(5, 150, 105, 0.25);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #546e7a;
    color: white;
    padding: 14px 28px;
}

.btn-secondary:hover {
    background: #455a64;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(55, 65, 81, 0.25);
}

.btn-success {
    background: var(--green-700);
    color: white;
    padding: 10px 20px;
    font-size: 0.9em;
}

.btn-success:hover:not(:disabled) {
    background: var(--green-900);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(27, 94, 32, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.icon {
    font-size: 1.2em;
}

.right-panel {
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.panel-header h2 {
    margin: 0;
    border: none;
    padding: 0;
}

.prompt-output {
    flex: 1;
    display: flex;
    flex-direction: column;
}

#generatedPrompt {
    width: 100%;
    flex: 1;
    min-height: 500px;
    padding: 20px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1em;
    font-family: 'Kanit', sans-serif;
    line-height: 1.6;
    resize: vertical;
    background: white;
    color: var(--slate-900);
}

#generatedPrompt:focus {
    outline: none;
    border-color: var(--green-700);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
}

.ai-links {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid var(--border);
}

.ai-links h3 {
    font-size: 1em;
    color: var(--slate-700);
    margin-bottom: 15px;
    font-weight: 600;
}

.ai-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
}

.ai-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 15px;
    background: #f8fafc;
    border: 2px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--slate-900);
    font-weight: 500;
    font-size: 0.9em;
    transition: all 0.3s ease;
    cursor: pointer;
    pointer-events: auto;
}

.ai-btn:hover:not(.disabled) {
    background: var(--green-700);
    border-color: var(--green-700);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(5, 150, 105, 0.25);
}

.ai-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
    background: #e9eef3 !important;
    border-color: #dfe5ec !important;
    color: var(--slate-500) !important;
}

.ai-icon {
    font-size: 1.2em;
}

.footer {
    padding: 18px 30px 22px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 6px;
    font-size: 0.95em;
    color: var(--slate-700);
    background: linear-gradient(135deg, #ecfdf5 0%, #e6fffa 50%, #f0fdf4 100%);
    border-top: 1px solid #e4efe9;
}

.footer-counter {
    color: #000000;
    font-size: 0.95em;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    #educationLevelGroup {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 1em;
    }

    .main-content {
        padding: 20px;
    }

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

    .btn {
        width: 100%;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .panel-header .btn-success {
        width: 100%;
    }
}

/* Animation for prompt generation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.prompt-output textarea {
    animation: fadeIn 0.5s ease;
}