:root {
    --primary-color: #00a8ff;
    --secondary-color: #00c6ff;
    --dark-bg: #121212;
    --light-bg: #1e1e1e;
    --text-color: #ffffff;
    --text-muted-color: #a0a0a0;
    --card-bg: #2a2a2a;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-color);
}

/* Navigation Bar */
.navbar {
    transition: background-color 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(18, 18, 18, 0.85);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 400;
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color) !important;
}

.navbar .btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 50px;
    padding: 8px 25px;
    transition: all 0.3s;
}

.navbar .btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}


/* Hero Section */
.hero-section {
    padding: 180px 0 100px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}

.hero-section .display-3 {
    font-weight: 700;
    text-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.hero-section .lead {
    max-width: 600px;
    margin: 0 auto;
    font-weight: 300;
}




.hero-section .btn-light {
    background-color: rgba(255,255,255,0.9);
    color: var(--primary-color);
    border: none;
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s;
}

.hero-section .btn-light:hover {
    background-color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

/* General Section Styling */
section {
    overflow: hidden;
}

section h2 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.bg-light {
    background-color: var(--light-bg) !important;
}

.text-muted {
    color: var(--text-muted-color) !important;
}

/* Image Placeholder */
.image-placeholder {
    height: 300px;
    width: 100%;
    background-color: #333;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    border: 2px dashed #444;
    transition: all 0.3s;
}

.image-placeholder:hover {
    border-color: var(--primary-color);
    color: #888;
}

.placeholder-content {
    text-align: center;
}

.card .image-placeholder {
    height: 200px;
    border-radius: 10px 10px 0 0;
    border: none;
}

/* Feature Card */
.feature-card {
    background-color: var(--card-bg);
    border: 1px solid #333;
    border-radius: 15px;
    transition: all 0.3s ease-in-out;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    border-color: var(--primary-color);
}

.feature-card .card-title {
    color: var(--primary-color);
    font-weight: 600;
}

.feature-card .card-text {
    color: #c5c5c5; /* 説明文のテキスト色を明るく設定 */
}


/* How to Use Section */
#how-to-use .step-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: inline-block;
    background: rgba(0, 168, 255, 0.1);
    width: 100px;
    height: 100px;
    border-radius: 50%;
    line-height: 100px;
    transition: all 0.3s;
}

#how-to-use .row > div:hover .step-icon {
    transform: scale(1.1) rotate(10deg);
}

#how-to-use h4 {
    font-weight: 600;
    margin-top: 10px;
    color: var(--text-color);
}

/* FAQ Section */
.accordion-item {
    background-color: var(--card-bg);
    border: 1px solid #333;
    color: var(--text-color);
}

.accordion-button {
    background-color: var(--card-bg);
    color: var(--text-color);
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    color: var(--primary-color);
    background-color: #333;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--primary-color);
}

.accordion-body {
    color: var(--text-muted-color);
}

.accordion-button::after {
    filter: invert(1) grayscale(100);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

.cta-section .btn-light {
     background-color: rgba(255,255,255,0.9);
    color: var(--primary-color);
    border: none;
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s;
}

.cta-section .btn-light:hover {
    background-color: #fff;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

/* Pricing Section */
#pricing {
    background-color: var(--dark-bg);
}

.pricing-table {
    background-color: var(--card-bg);
    border-color: var(--light-bg);
    color: var(--text-color);
    border-radius: 15px;
    overflow: hidden;
}

.pricing-table thead {
    background: linear-gradient(135deg, var(--light-bg), var(--card-bg));
}

.pricing-table th {
    border-color: var(--light-bg);
    padding: 1.5rem 1rem;
    vertical-align: middle;
}

.pricing-table th.feature-col {
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
}

.pricing-table td {
    border-color: var(--light-bg);
    padding: 1rem;
    vertical-align: middle;
}

.pricing-table .feature-col {
    background-color: var(--light-bg);
    font-weight: 500;
    width: 40%;
}

.pricing-table .plan-col {
    width: 30%;
    text-align: center;
}

.pricing-table .premium-plan {
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.2), rgba(0, 198, 255, 0.1));
    border: 2px solid var(--primary-color);
    position: relative;
}

.pricing-table thead .premium-plan {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.pricing-table thead .premium-plan h4,
.pricing-table thead .premium-plan .price,
.pricing-table thead .premium-plan .period {
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.pricing-table .premium-plan .badge {
    font-size: 0.75rem;
    padding: 0.35rem 0.8rem;
    border-radius: 20px;
    background-color: rgba(255, 255, 255, 0.95) !important;
    color: var(--primary-color) !important;
    font-weight: 600;
}

.pricing-table .plan-header {
    padding: 0.5rem 0;
}

.pricing-table .plan-header h4 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.pricing-table .plan-price {
    margin-top: 0.5rem;
}

.pricing-table .plan-price .price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.pricing-table .plan-price .period {
    font-size: 0.9rem;
    color: var(--text-muted-color);
}

.pricing-table .feature-name {
    font-weight: 500;
}

.pricing-table .highlight-row {
    background-color: rgba(0, 168, 255, 0.05);
}

.pricing-table .highlight-row td {
    font-weight: 600;
}

.pricing-table i.fa-check {
    font-size: 1.2rem;
}

.pricing-table i.fa-times {
    font-size: 1.2rem;
}

.pricing-table i.fa-minus {
    font-size: 1.2rem;
}