:root {
    --bg-dark: #0d0d12;
    --box-bg: #1a1a24;
    --text-light: #e0e0e0;
    --neon-purple: #b829ff;
    --neon-blue: #00e5ff;
}

body {
    font-family: 'Sarabun', 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    margin: 0;
    padding: 0;
}

/* Animation ไฟวิ่งสลับสีสไตล์ Cyberpunk */
@keyframes neon-border-run {
    0% { border-color: var(--neon-purple); box-shadow: 0 0 5px var(--neon-purple); }
    50% { border-color: var(--neon-blue); box-shadow: 0 0 15px var(--neon-blue); }
    100% { border-color: var(--neon-purple); box-shadow: 0 0 5px var(--neon-purple); }
}

.main-header {
    background-color: var(--box-bg);
    height: 80px;
    display: flex;
    align-items: center;
    padding: 0 30px;
    border-bottom: 3px solid var(--neon-purple);
    animation: neon-border-run 4s linear infinite;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.btn-back-home {
    background-color: var(--box-bg);
    color: #fff;
    border: 1px solid var(--neon-purple);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: 0.3s;
}

.btn-back-home:hover {
    background-color: var(--neon-purple);
    box-shadow: 0 0 15px var(--neon-purple);
}

.header-title {
    flex-grow: 1;
    text-align: center;
    color: white;
    text-shadow: 0 0 10px var(--neon-purple), 0 0 20px var(--neon-purple);
    margin-right: 80px;
}

.container {
    max-width: 1100px;
    margin: 40px auto;
    padding: 20px;
}

.instruction {
    text-align: center;
    color: var(--neon-purple);
    font-weight: bold;
    margin-bottom: 25px;
}

.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

.subject-item {
    background: var(--box-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #333;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: 0.3s;
}

.subject-item:hover {
    border-color: var(--neon-purple);
    transform: translateY(-3px);
    box-shadow: 0 0 10px rgba(184, 41, 255, 0.4);
}

.subject-item input[type="checkbox"] {
    accent-color: var(--neon-purple);
    margin-right: 15px;
    width: 20px;
    height: 20px;
}

.analyze-btn {
    display: block;
    width: 100%;
    max-width: 320px;
    margin: 50px auto;
    padding: 15px;
    background: transparent;
    color: white;
    border: 2px solid var(--neon-purple);
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    animation: neon-border-run 2s linear infinite;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.analyze-btn:hover {
    background: var(--neon-purple);
    color: black;
    box-shadow: 0 0 40px var(--neon-purple);
}

.career-card {
    background: var(--box-bg);
    padding: 25px;
    border-radius: 12px;
    border-left: 6px solid var(--neon-purple);
    margin-bottom: 25px;
    border-top: 1px solid #333;
    border-right: 1px solid #333;
    border-bottom: 1px solid #333;
    animation: fadeIn 0.6s ease;
}

.career-name {
    color: white;
    font-size: 1.6rem;
    font-weight: bold;
    text-shadow: 0 0 8px var(--neon-purple);
}

.career-desc {
    background: #222230;
    padding: 15px;
    border-radius: 8px;
    margin-top: 12px;
    color: #ccc;
    font-size: 1rem;
    line-height: 1.6;
}

.match-score {
    margin-top: 15px;
    color: var(--neon-purple);
    font-weight: bold;
    font-size: 1.1rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}