:root {
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Outfit', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, #1e293b 0%, #0f172a 100%);
}

.background-animation::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url('https://www.transparenttextures.com/patterns/carbon-fibre.png');
    opacity: 0.1;
    animation: rotate 60s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.back-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    margin-bottom: 20px;
    font-size: 0.9rem;
    transition: transform 0.3s;
}

.back-link:hover {
    transform: translateX(-5px);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: #94a3b8;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.input-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #cbd5e1;
}

textarea,
input[type="text"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 15px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

textarea {
    height: 120px;
    resize: none;
}

textarea:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 210, 255, 0.1);
}

.options-group {
    margin-bottom: 30px;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group input {
    display: none;
}

.radio-group label {
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 0;
}

.radio-group input:checked+label {
    background: var(--primary-color);
    color: var(--bg-dark);
    font-weight: bold;
    border-color: var(--primary-color);
}

.primary-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 210, 255, 0.3);
}

.hidden {
    display: none;
}

.results-area {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--glass-border);
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.solution-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    animation: slideUp 0.5s ease-out forwards;
    opacity: 0;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.solution-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.solution-card p {
    color: #94a3b8;
    font-size: 0.95rem;
}

.solution-card .detail-text {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    color: #cbd5e1;
    font-size: 0.9rem;
}