body {
    margin: 0;
    padding: 0;
    font-family: 'Hiragino Sans', 'ヒラギノ角ゴシック', 'Yu Gothic', '游ゴシック', 'Meiryo', 'メイリオ', sans-serif;
    font-weight: 400;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 300;
}

p {
    font-weight: 400;
}

/* header */
header {
    background: #EBFCF9;
    padding: 2rem 1rem;
    gap: 2rem;
}

header .header-left {
    width: 100%;
    gap: 1rem;
    text-align: center;
}

header .header-left .header-left-top {
    width: fit-content;
    border-radius: 1rem;
    background: white;
    padding: 0.2rem 0.4rem;
    font-size: 0.9rem;
}

.header-left-title {
    font-size: 1.8rem;
    line-height: 1.4;
    margin: 0;
}

.header-left-title span {
    color: #65C2C9;
}

.header-left-description {
    color: #576371;
    font-size: 0.95rem;
    line-height: 1.6;
}

.header-left-app-link {
    gap: 0.8rem;
    justify-content: center;
}

.header-left-app-link a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.header-left-app-link a img {
    height: 45px;
    width: auto;
}

.header-left-app-link a:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.header-left-download-count {
    gap: 1.5rem;
}

.header-left-download-count div {
    text-align: center;
}

.header-left-download-count .count-number {
    font-size: 1.5rem;
    font-weight: 600;
    color: #111828;
}

.header-left-download-count .count-label {
    font-size: 0.8rem;
    color: #576371;
}

.header-left-download-count .divider {
    width: 1px;
    background: #576371;
    height: 40px;
    align-self: center;
}

header .header-right {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.header-right img {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 1rem;
}

/* section common */
section {
    padding: 3rem 1rem;
}

/* section1 - feature */
section .feature-title {
    text-align: center;
    margin-bottom: 2rem;
    padding: 0 1rem;
}

section .feature-title h2 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
}

section .feature-title p {
    font-size: 1rem;
    color: #4A5565;
}

section .feature-cards {
    padding: 0 5%;
}

section .feature-card {
    padding: 1.25rem;
    border-radius: 0.7rem;
    gap: 0.5rem;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    background: white;
    height: 100%;
}

section .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.15);
}

section .feature-card .feature-card-icon {
    width: fit-content;
    padding: 10px;
    border-radius: 0.7rem;
}

section .feature-card:nth-child(1) .feature-card-icon {
    background: #5BB5BC;
}

section .feature-card:nth-child(2) .feature-card-icon {
    background: #4E9CA4;
}

section .feature-card:nth-child(3) .feature-card-icon {
    background: #40BED0;
}

section .feature-card:nth-child(4) .feature-card-icon {
    background: #2BBEB5;
}

section .feature-card:nth-child(5) .feature-card-icon {
    background: #2B9592;
}

section .feature-card:nth-child(6) .feature-card-icon {
    background: #00BBD7;
}

section .feature-card h3 {
    color: #111828;
    font-size: 1.1rem;
    margin: 0.5rem 0;
}

section .feature-card p {
    color: #4A5565;
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

/* section2 - starter */
section:nth-child(2) {
    background: #F8F9FB;
}

section .starter-title {
    margin-bottom: 2rem;
}

section .starter-title h2 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
}

section .starter-title p {
    color: #4A5565;
    font-size: 1rem;
}

section .starter-content {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

section .starter-content-discriptions {
    gap: 1.5rem;
}

section .starter-content-discription {
    gap: 1rem;
    align-items: flex-start;
}

section .starter-content-discription-icon {
    border-radius: 0.7rem;
    position: relative;
    flex-shrink: 0;
}

section .starter-content-discription-icon span {
    width: 18px;
    height: 18px;
    font-size: 10px;
    font-weight: 600;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: -5px;
    left: -5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section .starter-content-discription-icon-svg {
    width: fit-content;
    padding: 0.6rem;
    border-radius: 0.7rem;
    background: #65C2C9;
}

section .starter-content-discription-icon svg {
    width: 24px;
    height: 24px;
}

section .starter-content-discription-sentence h3 {
    color: #111828;
    font-size: 1rem;
    font-weight: 500;
    margin: 0 0 0.3rem 0;
}

section .starter-content-discription-sentence p {
    color: #4A5565;
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

section .starter-content-image {
    text-align: center;
}

section .starter-content-image img {
    width: 100%;
    max-width: 350px;
    height: auto;
    object-fit: contain;
}

/* ================================
   Tablet (768px以上)
   ================================ */
@media (min-width: 768px) {
    header {
        padding: 3rem 3rem;
    }

    header .header-left {
        gap: 1.2rem;
    }

    .header-left-title {
        font-size: 2.2rem;
    }

    .header-left-description {
        font-size: 1rem;
    }

    .header-left-app-link a img {
        height: 50px;
    }

    section {
        padding: 4rem 2rem;
    }

    section .feature-title h2 {
        font-size: 2rem;
    }

    section .feature-title p {
        font-size: 1.1rem;
    }

    section .feature-cards {
        padding: 0 8%;
    }

    section .feature-card {
        padding: 1.5rem;
    }

    section .feature-card h3 {
        font-size: 1.2rem;
    }

    section .feature-card p {
        font-size: 0.95rem;
    }

    section .starter-title h2 {
        font-size: 2rem;
    }

    section .starter-content {
        padding: 0 2rem;
    }

    section .starter-content-discription-sentence h3 {
        font-size: 1.1rem;
    }

    section .starter-content-image img {
        max-width: 400px;
    }
}

/* ================================
   Desktop (992px以上)
   ================================ */
@media (min-width: 992px) {
    header {
        padding: 4rem 5rem;
        gap: 3rem;
    }

    header .header-left {
        width: 50%;
        text-align: left;
        gap: 1.5rem;
    }

    .header-left-title {
        font-size: 2.5rem;
    }

    .header-left-description {
        font-size: 1.05rem;
    }

    .header-left-app-link {
        justify-content: flex-start;
        gap: 1rem;
    }

    .header-left-app-link a img {
        height: 55px;
    }

    .header-left-download-count {
        justify-content: flex-start;
    }

    header .header-right {
        width: 50%;
        max-width: none;
    }

    section {
        padding: 5rem 3rem;
    }

    section .feature-title h2 {
        font-size: 2.3rem;
    }

    section .feature-cards {
        padding: 0 10%;
    }

    section .feature-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 0 25px 0 rgba(0, 0, 0, 0.2);
    }

    section .starter-title h2 {
        font-size: 2.3rem;
    }

    section .starter-content {
        padding: 0 3rem;
    }

    section .starter-content-discriptions {
        gap: 2rem;
    }

    section .starter-content-discription-icon-svg {
        padding: 0.8rem;
    }

    section .starter-content-discription-icon svg {
        width: 28px;
        height: 28px;
    }

    section .starter-content-discription-sentence h3 {
        font-size: 1.2rem;
    }

    section .starter-content-discription-sentence p {
        font-size: 1rem;
    }

    section .starter-content-image img {
        max-width: 500px;
    }
}

/* ================================
   Large Desktop (1200px以上)
   ================================ */
@media (min-width: 1200px) {
    header {
        padding: 4rem 8rem;
    }

    .header-left-title {
        font-size: 2.8rem;
    }

    .header-left-description {
        font-size: 1.1rem;
    }

    section .feature-title h2 {
        font-size: 2.5rem;
    }

    section .starter-title h2 {
        font-size: 2.5rem;
    }
}

/* footer */
/* features highlight */
.features-highlight {
    margin-top: 4rem;
    padding: 0 10%;
}

.features-highlight-card {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    align-items: stretch;
    gap: 2rem;
    background: white;
    border-radius: 1.5rem;
    padding: 3rem 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.features-highlight-item {
    flex: 1;
    min-width: 200px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.features-highlight-icon {
    font-size: 2.5rem;
}

.features-highlight-item h3 {
    font-size: 1.5rem;
    color: #111828;
    margin: 0;
}

.features-highlight-item p {
    font-size: 1rem;
    color: #6B7280;
    margin: 0;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #5BB5BC 0%, #40BED0 50%, #65C2C9 100%);
    padding: 3rem 1.5rem;
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 0.5rem;
}

.cta-section h2 {
    font-size: 1.4rem;
    color: white;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.cta-app-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.cta-app-link img {
    height: 42px;
    width: auto;
}

@media (min-width: 768px) {
    .cta-section {
        padding: 4rem 2rem;
    }

    .cta-content {
        padding: 0;
    }

    .cta-section h2 {
        font-size: 1.8rem;
        line-height: 1.4;
    }

    .cta-description {
        font-size: 1.05rem;
        margin-bottom: 2rem;
    }

    .cta-buttons {
        flex-direction: row;
        gap: 1rem;
        margin-bottom: 2rem;
    }

    .cta-app-link img {
        height: 48px;
    }
}

@media (min-width: 992px) {
    .cta-section {
        padding: 5rem 2rem;
    }

    .cta-section h2 {
        font-size: 2.2rem;
        margin-bottom: 1.5rem;
    }

    .cta-description {
        font-size: 1.15rem;
        margin-bottom: 2.5rem;
    }

    .cta-app-link img {
        height: 55px;
    }
}

@media (min-width: 1200px) {
    .cta-section h2 {
        font-size: 2.5rem;
    }

    .cta-description {
        font-size: 1.2rem;
    }
}

.cta-app-link:hover {
    transform: scale(1.05);
    opacity: 0.95;
}

.cta-guarantee {
    color: white;
    font-size: 0.85rem;
    margin: 0;
}

/* ================================
   Footer - Mobile First
   ================================ */
footer {
    background: #1a202c;
    color: white;
    padding: 2.5rem 1.5rem 1.5rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-brand {
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.footer-logo-icon {
    font-size: 1.3rem;
}

.footer-logo-text {
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.7;
    margin: 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
}

.footer-links-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: white;
}

.footer-links-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links-column li {
    margin-bottom: 0.5rem;
}

.footer-links-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.footer-links-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    margin: 0;
}

/* ================================
   Footer - Tablet (768px以上)
   ================================ */
@media (min-width: 768px) {
    footer {
        padding: 3rem 5% 2rem;
    }

    .footer-content {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: flex-start;
        gap: 2.5rem;
    }

    .footer-brand {
        text-align: left;
        flex: 1;
        min-width: 250px;
        max-width: 350px;
    }

    .footer-logo {
        justify-content: flex-start;
    }

    .footer-links {
        gap: 3rem;
    }

    .footer-links-column h4 {
        font-size: 0.95rem;
    }

    .footer-links-column a {
        font-size: 0.9rem;
    }

    .footer-bottom p {
        font-size: 0.85rem;
    }

    .cta-guarantee {
        font-size: 0.95rem;
    }
}

/* ================================
   Footer - Desktop (992px以上)
   ================================ */
@media (min-width: 992px) {
    footer {
        padding: 4rem 8% 2rem;
    }

    .footer-content {
        gap: 3rem;
        padding-bottom: 3rem;
    }

    .footer-logo-icon {
        font-size: 1.5rem;
    }

    .footer-logo-text {
        font-size: 1.3rem;
    }

    .footer-description {
        font-size: 0.95rem;
        line-height: 1.8;
    }

    .footer-links {
        gap: 5rem;
    }

    .footer-links-column h4 {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .footer-links-column li {
        margin-bottom: 0.75rem;
    }

    .footer-links-column a {
        font-size: 0.95rem;
    }

    .footer-bottom {
        padding-top: 2rem;
    }

    .footer-bottom p {
        font-size: 0.9rem;
    }

    .cta-guarantee {
        font-size: 1rem;
    }
}