:root {
    --color-primary: #10a7a1;
    --color-primary-dark: #087f7a;
    --color-primary-light: #e7f8f7;
    --color-accent: #ffb84d;
    --color-navy: #183153;
    --color-text: #38475a;
    --color-muted: #6f7e8f;
    --color-bg: #f7fbfc;
    --color-white: #ffffff;
    --color-border: #dce9eb;
    --shadow-soft: 0 18px 50px rgba(24, 49, 83, 0.10);
    --shadow-card: 0 12px 35px rgba(24, 49, 83, 0.08);
    --radius-large: 32px;
    --radius-medium: 20px;
    --container: 1180px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--color-text);
    background: var(--color-white);
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN",
        "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

body.menu-open {
    overflow: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
textarea,
select {
    font: inherit;
}

.container {
    width: min(calc(100% - 40px), var(--container));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    top: -80px;
    left: 16px;
    z-index: 9999;
    padding: 10px 16px;
    background: var(--color-navy);
    color: #fff;
    border-radius: 8px;
}

.skip-link:focus {
    top: 16px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(220, 233, 235, 0.8);
    backdrop-filter: blur(14px);
}

.site-header__inner {
    min-height: 82px;
    display: flex;
    align-items: center;
    gap: 34px;
}

.site-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.site-logo__mark {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    border-radius: 16px 16px 16px 5px;
    background: var(--color-primary);
    color: #fff;
    font-size: 21px;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.site-logo__text {
    display: grid;
    line-height: 1.2;
}

.site-logo__text strong {
    color: var(--color-navy);
    font-size: 17px;
    letter-spacing: 0.02em;
}

.site-logo__text small {
    color: var(--color-primary-dark);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.global-nav {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 28px;
}

.global-nav a {
    position: relative;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-navy);
}

.global-nav a:not(.global-nav__business)::after {
    position: absolute;
    right: 0;
    bottom: -8px;
    left: 0;
    height: 2px;
    content: "";
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.global-nav a:hover::after,
.global-nav a:focus-visible::after {
    transform: scaleX(1);
}

.global-nav__business {
    padding-left: 26px;
    border-left: 1px solid var(--color-border);
    color: var(--color-muted) !important;
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.button {
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 12px 26px;
    border: 2px solid transparent;
    border-radius: 999px;
    font-weight: 800;
    line-height: 1.35;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-2px);
}

.button--primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 10px 24px rgba(16, 167, 161, 0.24);
}

.button--primary:hover,
.button--primary:focus-visible {
    background: var(--color-primary-dark);
}

.button--secondary {
    background: #fff;
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.button--white {
    min-width: 260px;
    background: #fff;
    color: var(--color-primary-dark);
    box-shadow: var(--shadow-card);
}

.button--large {
    min-height: 62px;
    padding-inline: 34px;
}

.button--header {
    min-height: 46px;
    padding: 9px 22px;
    font-size: 14px;
}

.menu-button {
    width: 48px;
    height: 48px;
    display: none;
    place-items: center;
    padding: 11px;
    border: 0;
    border-radius: 50%;
    background: var(--color-primary-light);
    cursor: pointer;
}

.menu-button span {
    width: 22px;
    height: 2px;
    display: block;
    margin: 4px auto;
    background: var(--color-primary-dark);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero {
    position: relative;
    min-height: 690px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background:
        radial-gradient(circle at 80% 18%, rgba(255, 184, 77, 0.24), transparent 24%),
        linear-gradient(135deg, #f4fcfb 0%, #ffffff 48%, #eff9ff 100%);
}

.hero__inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(420px, 0.92fr);
    align-items: center;
    gap: 80px;
    padding-block: 84px;
}

.hero__eyebrow,
.section-heading__en,
.trial__en {
    margin: 0 0 18px;
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.16em;
}

.hero__title {
    margin: 0;
    color: var(--color-navy);
    font-size: clamp(42px, 5vw, 68px);
    line-height: 1.3;
    letter-spacing: -0.04em;
}

.hero__title span {
    color: var(--color-primary-dark);
}

.hero__lead {
    margin: 28px 0 0;
    font-size: 17px;
    font-weight: 500;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 36px;
}

.hero__features {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    margin: 30px 0 0;
    padding: 0;
    list-style: none;
}

.hero__features li {
    position: relative;
    padding-left: 23px;
    color: var(--color-navy);
    font-size: 14px;
    font-weight: 800;
}

.hero__features li::before {
    position: absolute;
    top: 0.55em;
    left: 0;
    width: 14px;
    height: 14px;
    content: "✓";
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 9px;
    line-height: 1;
}

.hero__visual {
    position: relative;
    min-height: 490px;
    display: grid;
    place-items: center;
}

.lesson-card {
    width: min(100%, 480px);
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.84);
    box-shadow: var(--shadow-soft);
    transform: rotate(1.5deg);
}

.lesson-card__screen {
    position: relative;
    min-height: 350px;
    overflow: hidden;
    border-radius: 24px;
    background: linear-gradient(135deg, #d6f4f0 0%, #c9eaf8 100%);
}

.lesson-card__teacher {
    position: absolute;
    inset: 38px 34px auto;
    min-height: 145px;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 24px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.90);
}

.lesson-card__teacher strong {
    display: block;
    color: var(--color-navy);
    font-size: 26px;
}

.lesson-card__teacher small {
    color: var(--color-muted);
    font-size: 14px;
}

.lesson-card__student {
    position: absolute;
    right: 24px;
    bottom: 24px;
    width: 128px;
    height: 98px;
    display: grid;
    place-items: center;
    border: 5px solid #fff;
    border-radius: 18px;
    background: #ffddab;
    box-shadow: var(--shadow-card);
}

.avatar {
    display: grid;
    place-items: center;
    border-radius: 50%;
    font-weight: 900;
}

.avatar--teacher {
    width: 80px;
    height: 80px;
    background: var(--color-primary);
    color: #fff;
    font-size: 30px;
}

.avatar--student {
    width: 60px;
    height: 60px;
    background: var(--color-accent);
    color: var(--color-navy);
    font-size: 24px;
}

.lesson-card__footer {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 10px 2px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 700;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #39c273;
    box-shadow: 0 0 0 5px rgba(57, 194, 115, 0.15);
}

.floating-card {
    position: absolute;
    z-index: 3;
    min-width: 190px;
    padding: 16px 20px;
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow-card);
}

.floating-card strong,
.floating-card span {
    display: block;
}

.floating-card strong {
    color: var(--color-navy);
    font-size: 15px;
}

.floating-card span {
    color: var(--color-muted);
    font-size: 12px;
}

.floating-card--top {
    top: 28px;
    right: -26px;
}

.floating-card--bottom {
    bottom: 24px;
    left: -22px;
}

.hero__decoration {
    position: absolute;
    border-radius: 50%;
    filter: blur(1px);
}

.hero__decoration--one {
    top: 110px;
    left: -120px;
    width: 300px;
    height: 300px;
    background: rgba(16, 167, 161, 0.10);
}

.hero__decoration--two {
    right: -100px;
    bottom: -120px;
    width: 360px;
    height: 360px;
    background: rgba(255, 184, 77, 0.15);
}

.news-strip {
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background: #fff;
}

.news-strip__inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 14px;
}

.news-strip__label {
    margin: 0;
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.16em;
}

.news-strip time {
    color: var(--color-muted);
}

.news-strip a {
    font-weight: 700;
}

.section {
    padding-block: 112px;
}

.section--intro {
    background: #fff;
}

.section--courses {
    background: var(--color-bg);
}

.section--reasons {
    background: #fff;
}

.section--steps {
    background: #f4fbfb;
}

.section-heading {
    max-width: 720px;
    margin-bottom: 52px;
}

.section-heading--center {
    margin-inline: auto;
    text-align: center;
}

.section-heading h2 {
    margin: 0;
    color: var(--color-navy);
    font-size: clamp(30px, 4vw, 46px);
    line-height: 1.45;
    letter-spacing: -0.035em;
}

.section-heading > p:last-child {
    margin: 22px 0 0;
    color: var(--color-muted);
}

.intro-cards,
.course-grid,
.step-grid {
    display: grid;
    gap: 24px;
}

.intro-cards {
    grid-template-columns: repeat(3, 1fr);
}

.intro-card {
    position: relative;
    padding: 34px 30px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: #fff;
    box-shadow: var(--shadow-card);
}

.intro-card__number {
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0.1em;
}

.intro-card h3,
.course-card h3,
.step-card h3 {
    margin: 14px 0 12px;
    color: var(--color-navy);
    line-height: 1.45;
}

.intro-card h3 {
    font-size: 21px;
}

.intro-card p,
.course-card p,
.step-card p {
    margin-bottom: 0;
    color: var(--color-muted);
    font-size: 14px;
}

.course-grid {
    grid-template-columns: repeat(4, 1fr);
}

.course-card {
    min-height: 420px;
    display: flex;
    flex-direction: column;
    padding: 30px 26px;
    border: 1px solid rgba(220, 233, 235, 0.8);
    border-radius: var(--radius-large);
    background: #fff;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.course-card:hover {
    transform: translateY(-7px);
    box-shadow: var(--shadow-soft);
}

.course-card__icon {
    width: 96px;
    height: 96px;
    display: grid;
    place-items: center;
    margin-bottom: 26px;
    border-radius: 30px 30px 30px 10px;
    color: var(--color-navy);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0.05em;
}

.course-card--yellow .course-card__icon { background: #fff0c9; }
.course-card--blue .course-card__icon { background: #d9f0ff; }
.course-card--green .course-card__icon { background: #dff6e8; }
.course-card--pink .course-card__icon { background: #ffe3e9; }

.course-card__age {
    margin: 0 !important;
    color: var(--color-primary-dark) !important;
    font-size: 12px !important;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.course-card h3 {
    font-size: 23px;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: auto;
    padding-top: 24px;
    color: var(--color-primary-dark);
    font-size: 14px;
    font-weight: 900;
}

.reason-list {
    display: grid;
    gap: 80px;
}

.reason {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 70px;
}

.reason--reverse .reason__visual {
    order: 2;
}

.reason__visual {
    min-height: 360px;
    display: grid;
    place-items: center;
    border-radius: 44px 44px 44px 12px;
    box-shadow: var(--shadow-soft);
}

.reason__visual span {
    width: 170px;
    height: 170px;
    display: grid;
    place-items: center;
    border: 12px solid rgba(255, 255, 255, 0.65);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.45);
    color: var(--color-navy);
    font-size: 21px;
    font-weight: 900;
    letter-spacing: 0.08em;
}

.reason__visual--talk { background: linear-gradient(135deg, #c9f0eb, #d8f5ff); }
.reason__visual--support { background: linear-gradient(135deg, #ffe8bd, #fff3dd); }
.reason__visual--growth { background: linear-gradient(135deg, #d9e9ff, #e8e3ff); }

.reason__number {
    margin: 0 0 14px;
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.14em;
}

.reason__content h3 {
    margin: 0;
    color: var(--color-navy);
    font-size: clamp(27px, 3vw, 38px);
    line-height: 1.5;
}

.reason__content > p:last-child {
    margin: 22px 0 0;
    color: var(--color-muted);
}

.step-grid {
    grid-template-columns: repeat(3, 1fr);
}

.step-card {
    position: relative;
    padding: 36px 30px;
    border-radius: var(--radius-medium);
    background: #fff;
    box-shadow: var(--shadow-card);
}

.step-card__number {
    color: var(--color-primary);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.12em;
}

.step-card h3 {
    font-size: 23px;
}

.trial {
    padding-block: 86px;
    background:
        radial-gradient(circle at 90% 0%, rgba(255, 255, 255, 0.18), transparent 25%),
        linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: #fff;
}

.trial__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.trial__en {
    color: rgba(255, 255, 255, 0.82);
}

.trial h2 {
    margin: 0;
    font-size: clamp(30px, 4vw, 46px);
    line-height: 1.45;
}

.trial p:last-child {
    margin: 18px 0 0;
    color: rgba(255, 255, 255, 0.86);
}

.site-footer {
    background: #132b49;
    color: rgba(255, 255, 255, 0.78);
}

.site-footer__top {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 80px;
    padding-block: 76px;
}

.site-logo--footer .site-logo__text strong,
.site-logo--footer .site-logo__text small {
    color: #fff;
}

.site-footer__brand p {
    margin-top: 24px;
}

.site-footer__links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 34px;
}

.site-footer__links div {
    display: grid;
    align-content: start;
    gap: 10px;
}

.site-footer__links h2 {
    margin: 0 0 8px;
    color: #fff;
    font-size: 14px;
}

.site-footer__links a {
    font-size: 13px;
}

.site-footer__links a:hover,
.site-footer__links a:focus-visible {
    color: #fff;
}

.site-footer__bottom {
    padding-block: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.site-footer__bottom small {
    font-size: 11px;
}

@media (max-width: 1050px) {
    .global-nav {
        position: fixed;
        top: 72px;
        right: 0;
        left: 0;
        z-index: 999;
        max-height: 0;
        display: grid;
        gap: 0;
        overflow: hidden;
        margin: 0;
        padding: 0 20px;
        background: #fff;
        box-shadow: 0 20px 30px rgba(24, 49, 83, 0.12);
        transition: max-height 0.25s ease, padding 0.25s ease;
    }

    .global-nav.is-open {
        max-height: 420px;
        padding-block: 18px 26px;
    }

    .global-nav a {
        padding: 14px 6px;
        border-bottom: 1px solid var(--color-border);
    }

    .global-nav__business {
        padding-left: 6px;
        border-left: 0;
    }

    .menu-button {
        display: block;
    }

    .menu-button.is-open span:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }

    .menu-button.is-open span:nth-child(2) {
        opacity: 0;
    }

    .menu-button.is-open span:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }

    .hero__inner {
        grid-template-columns: 1fr 0.85fr;
        gap: 35px;
    }

    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 780px) {
    .container {
        width: min(calc(100% - 30px), var(--container));
    }

    .site-header__inner {
        min-height: 72px;
    }

    .site-logo__mark {
        width: 42px;
        height: 42px;
        font-size: 18px;
    }

    .site-logo__text strong {
        font-size: 14px;
    }

    .site-logo__text small {
        font-size: 9px;
    }

    .button--header {
        display: none;
    }

    .hero {
        min-height: auto;
    }

    .hero__inner {
        grid-template-columns: 1fr;
        gap: 35px;
        padding-block: 56px 64px;
    }

    .hero__title {
        font-size: clamp(37px, 11vw, 52px);
    }

    .hero__lead {
        font-size: 15px;
    }

    .hero__actions {
        display: grid;
    }

    .button--large {
        width: 100%;
    }

    .hero__visual {
        min-height: 385px;
    }

    .lesson-card {
        max-width: 430px;
    }

    .lesson-card__screen {
        min-height: 290px;
    }

    .floating-card--top {
        top: 5px;
        right: -4px;
    }

    .floating-card--bottom {
        bottom: 0;
        left: -4px;
    }

    .news-strip__inner {
        align-items: flex-start;
        flex-wrap: wrap;
        gap: 4px 14px;
        padding-block: 17px;
    }

    .news-strip a {
        width: 100%;
    }

    .section {
        padding-block: 78px;
    }

    .section-heading {
        margin-bottom: 38px;
    }

    .section-heading h2 {
        font-size: 31px;
    }

    .intro-cards,
    .course-grid,
    .step-grid {
        grid-template-columns: 1fr;
    }

    .course-card {
        min-height: auto;
    }

    .reason-list {
        gap: 62px;
    }

    .reason,
    .reason--reverse {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .reason--reverse .reason__visual {
        order: 0;
    }

    .reason__visual {
        min-height: 280px;
    }

    .trial__inner {
        display: grid;
    }

    .trial h2 {
        font-size: 31px;
    }

    .site-footer__top,
    .site-footer__links {
        grid-template-columns: 1fr;
    }

    .site-footer__top {
        gap: 45px;
    }

    .site-footer__links {
        gap: 28px;
    }

    .pc-only {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}