:root {
    --primary-color: #0056b3;
    /* Deep Medical Blue */
    --accent-color: #00a8e8;
    /* Lighter Blue */
    --text-color: #333;
    --light-text: #666;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --gradient-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --primary-gradient: linear-gradient(135deg, #0056b3 0%, #00a8e8 100%);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav a {
    margin-left: 20px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-color);
}

.nav a:hover {
    color: var(--primary-color);
}

.nav .btn-primary-nav {
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
}

.nav .btn-primary-nav:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    /* header height */
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-bg);
    z-index: -1;
    opacity: 0.5;
}

/* Abstract Cloud Shapes for Hero Background */
.hero-bg::before,
.hero-bg::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    animation: float 10s infinite ease-in-out alternate;
}

.hero-bg::before {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: var(--accent-color);
}

.hero-bg::after {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: var(--primary-color);
    animation-delay: -5s;
}

@keyframes float {
    from {
        transform: translate(0, 0);
    }

    to {
        transform: translate(30px, 50px);
    }
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero h1 .highlight {
    color: var(--accent-color);
    background: linear-gradient(120deg, transparent 0%, transparent 60%, rgba(0, 168, 232, 0.2) 60%);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--light-text);
    margin-bottom: 3rem;
    font-weight: 300;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 4rem;
}

.hero-powered {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 3rem;
    letter-spacing: 1px;
}

.link-text {
    color: var(--primary-color);
    text-decoration: underline;
    font-weight: 600;
}

.link-text:hover {
    color: var(--accent-color);
}

.btn-primary,
.btn-secondary {
    padding: 15px 35px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid #eef2f5;
}

.btn-primary:hover,
.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.presenter-info {
    font-size: 0.9rem;
    color: #888;
}

/* Sections */
.section {
    padding: 100px 0;
}

.bg-light {
    background-color: #f8faff;
}

.bg-blue {
    background: var(--primary-gradient);
    color: white;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
}

.section-title p {
    font-size: 1.1rem;
    color: inherit;
    opacity: 0.9;
}

/* Grid & Cards */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
    border: 1px solid #eee;
}

.card:hover {
    transform: translateY(-10px);
}

.card .icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.card p {
    color: var(--light-text);
    font-size: 0.95rem;
}

/* Features Rows */
.feature-row {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 80px;
}

.feature-row.reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-img {
    flex: 1;
}

.feature-img img {
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.feature-text p {
    margin-bottom: 1.5rem;
    color: var(--light-text);
    font-size: 1.1rem;
}

.check-list {
    list-style: none;
}

.check-list li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 25px;
    font-weight: 500;
}

.check-list li::before {
    content: '✓';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.caption {
    text-align: center;
    font-size: 0.8rem;
    color: #999;
    margin-top: 10px;
}

/* Feature Boxes (Blue Section) */
.feature-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-box h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.feature-box p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Vision */
.vision-content {
    max-width: 800px;
    margin: 0 auto;
}

.vision-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.vision-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    opacity: 0.3;
    line-height: 1;
}

.vision-detail h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.vision-detail p {
    color: var(--light-text);
}

/* Contact */
.contact-section {
    padding-bottom: 150px;
}

.contact-box {
    background: white;
    padding: 4rem;
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid #eee;
}

.partnership-types {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.tag {
    background: #eef5ff;
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
}

.cta-area {
    margin-top: 3rem;
    border-top: 2px solid #f0f0f0;
    padding-top: 3rem;
}

.cta-message {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.contact-details {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    text-align: left;
    flex-wrap: wrap;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    width: 150px;
    margin-bottom: 10px;
}

.qr-code p {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-color);
}

.author-details .name {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 5px;
}

.author-details .role {
    font-size: 0.9rem;
    color: var(--light-text);
}

/* Footer */
.footer {
    background: #333;
    color: #888;
    padding: 30px 0;
    text-align: center;
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {

    /* Header & Nav */
    .header {
        padding: 10px 0;
    }

    .nav-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 30px;
        height: 21px;
        background: transparent;
        border: none;
        cursor: pointer;
        z-index: 1001;
    }

    .nav-toggle span {
        width: 100%;
        height: 3px;
        background-color: var(--primary-color);
        border-radius: 3px;
        transition: all 0.3s ease;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: var(--white);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }

    .nav.active {
        right: 0;
    }

    .nav a {
        margin: 20px 0;
        font-size: 1.2rem;
    }

    body.no-scroll {
        overflow: hidden;
    }

    /* Hero */
    .hero {
        height: auto;
        padding-top: 120px;
        padding-bottom: 60px;
    }

    .hero h1 {
        font-size: 2.2rem;
        margin-bottom: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }

    .hero-cta {
        flex-direction: column;
        gap: 15px;
        padding: 0 20px;
    }

    /* Sections */
    .section {
        padding: 60px 0;
    }

    .section-title h2 {
        font-size: 1.8rem;
    }

    /* Grid & Cards */
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .card {
        padding: 1.5rem;
    }

    /* Feature Rows */
    .feature-row,
    .feature-row.reverse {
        flex-direction: column;
        gap: 30px;
        margin-bottom: 60px;
    }

    .feature-text h3 {
        font-size: 1.5rem;
    }

    .feature-text p {
        font-size: 1rem;
    }

    /* Vision */
    .vision-item {
        gap: 20px;
    }

    .vision-number {
        font-size: 2.5rem;
    }

    .vision-detail h3 {
        font-size: 1.3rem;
    }

    /* Contact */
    .contact-section {
        padding-bottom: 80px;
    }

    .contact-box {
        padding: 2.5rem 1.5rem;
    }

    .partnership-types {
        gap: 10px;
    }

    .tag {
        font-size: 0.8rem;
        padding: 6px 15px;
    }

    .contact-details {
        flex-direction: column;
        text-align: center;
    }

    .cta-area {
        margin-top: 2rem;
        padding-top: 2rem;
    }
}

/* Extra small devices */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .section-title h2 {
        font-size: 1.5rem;
    }

    .feature-text h3 {
        font-size: 1.35rem;
    }
}