:root {
    --online-primary: #3d348b;
    --online-purple: #46426b;
    --online-light-purple: #7678ed;
    --online-orange: #f18702;
    --online-gray: #6c6a80;
}

html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: #142b50;
    font-family: "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", Meiryo, sans-serif;
    font-size: 17px;
    line-height: 1.8;
}
a { color: var(--online-primary); }
img { max-width: 100%; }
h1, h2, h3, h4 { color: var(--online-purple); line-height: 1.45; }
.container { max-width: 1070px; }
.section { padding: 72px 20px; }
.section-title { margin-bottom: 48px; text-align: center; font-weight: 700; }
.light-text { color: var(--online-gray); }
.orange-text { color: var(--online-orange); }
.button {
    display: inline-block;
    padding: 15px 26px;
    border: 0;
    border-radius: 5px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}
.button-orange { background: var(--online-orange); color: #fff; }
.button-primary { background: var(--online-primary); color: #fff; }
.button-secondary { background: #aaa; color: #fff; }
.button-small { padding: 8px 17px; }
.button-block { width: 100%; text-align: center; }
.button:disabled { background: rgba(0,0,0,.12); color: rgba(0,0,0,.26); opacity: 1; cursor: default; }
.reservation-submit, .processing-submit { min-width: 86px; transition: transform .12s ease, filter .12s ease, opacity .12s ease; }
.reservation-submit:not(:disabled):active, .processing-submit:not(:disabled):active { transform: translateY(1px) scale(.96); filter: brightness(.9); }
.reservation-submit.is-submitting, .processing-submit.is-submitting { cursor: wait; opacity: .75; }
.reservation-waiting, .submit-waiting { display: inline-flex; align-items: center; gap: 8px; }
.reservation-waiting[hidden], .submit-waiting[hidden] { display: none; }
.waiting-circle { width: 18px; height: 18px; border: 2px solid rgba(255,255,255,.45); border-top-color: #fff; border-radius: 50%; animation: waiting-circle-spin .7s linear infinite; }
@keyframes waiting-circle-spin { to { transform: rotate(360deg); } }

.site-header { position: sticky; top: 0; z-index: 10; background: #fff; box-shadow: 0 1px 8px rgba(0,0,0,.05); }
.site-header.logo-only { position: static; box-shadow: none; }
.header-inner { max-width: 1240px; min-height: 72px; margin: auto; padding: 8px 24px; display: flex; align-items: center; gap: 24px; }
.brand img { display: block; width: 150px; }
.desktop-nav { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.desktop-nav > a:not(.button) { padding: 9px 12px; color: var(--online-gray); font-weight: 700; text-decoration: none; }
.desktop-nav > a.active { color: var(--online-primary); }
.mobile-menu { display: none; }

.site-footer { padding: 50px 20px 24px; background: linear-gradient(180deg, rgba(148,149,207,.18), rgba(118,120,237,0)); }
.site-footer hr { border-color: var(--online-purple); opacity: .25; }
.footer-trial, .cta { min-height: 250px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.footer-trial h2, .cta h2 { max-width: 520px; font-weight: 700; }
.footer-bottom { padding-top: 30px; display: flex; justify-content: space-between; gap: 30px; }
.footer-bottom p { font-size: 13px; }
.footer-links { display: flex; align-items: center; gap: 18px; }
.footer-links a { color: var(--online-gray); text-decoration: none; }
.footer-links i { font-size: 23px; }
.minimal-main { padding-top: 30px; padding-bottom: 80px; }

.hero { position: relative; overflow: hidden; padding: 55px 0 30px; background: linear-gradient(135deg, rgba(61,52,139,.08), transparent 60%); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 45px; }
.hero-copy h1 { font-size: clamp(28px, 4vw, 48px); font-weight: 700; }
.hero-copy .lead { margin: 28px 0; }
.hero-image { width: 100%; border-radius: 0 0 80px 0; }
.intro { max-width: 880px; margin: auto; }
.promise-grid, .voice-grid, .teacher-grid, .class-grid, .feature-grid { display: grid; gap: 28px; }
.promise-grid { grid-template-columns: repeat(3, 1fr); }
.promise-card { text-align: center; }
.promise-card h3 { font-size: 19px; }
.voice-grid { grid-template-columns: repeat(3, 1fr); }
.voice-card { padding: 24px; background: #f7f8fe; border-radius: 8px; }
.stars { color: #ffc107; }
.teacher-grid { grid-template-columns: repeat(3, 1fr); }
.teacher-card img.teacher-photo { width: 100%; border-radius: 15px; }
.teacher-name { display: flex; align-items: center; justify-content: space-between; }
.teacher-name img { width: 32px; }
.story { max-width: 720px; margin: auto; color: var(--online-gray); }
.story p { margin-bottom: 24px; }

.course-hero { display: block; width: 90%; margin: auto; }
.feature-grid { grid-template-columns: 1.25fr 1fr; align-items: center; }
.feature-list details { margin-bottom: 10px; padding: 16px 20px; border-left: 7px solid var(--online-primary); background: #dedefa; }
.feature-list summary { color: var(--online-purple); font-size: 18px; font-weight: 700; cursor: pointer; }
.feature-list details p { margin: 15px 0 0; color: var(--online-gray); }
.course-overview { display: grid; grid-template-columns: 1fr 1.25fr; gap: 45px; align-items: center; }
.check-list { list-style: none; padding: 0; }
.check-list li { margin: 9px 0; padding: 12px 15px; border-left: 7px solid var(--online-primary); }
.class-grid { grid-template-columns: repeat(2, 1fr); }
.class-card { padding: 34px; background: #f6f5ff; border-radius: 8px; }
.class-card > img { display: block; max-width: 220px; height: 135px; margin: 0 auto 20px; }

.form-page { max-width: 900px; margin: auto; padding: 25px 15px 70px; }
.form-page h1 { margin: 20px 0 25px; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.field { margin-bottom: 18px; }
.field label, .field-label { display: block; margin-bottom: 6px; color: var(--online-gray); font-weight: 600; }
.field input, .field select, .field textarea {
    width: 100%; padding: 12px 14px; border: 1px solid #bbb; border-radius: 5px; background: rgba(108,106,128,.07); font: inherit;
}
.field textarea { min-height: 130px; }
.validation-message, .validation-errors, .form-error { color: #b00020; }
.radio-row { display: flex; flex-wrap: wrap; gap: 22px; }
.radio-row label, .checkbox { display: flex; align-items: center; gap: 8px; }
.contract { max-height: 300px; overflow-y: auto; padding: 20px; border: 1px solid #bbb; border-radius: 5px; font-size: 14px; }
.modal-backdrop { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 20px; background: rgba(0,0,0,.55); }
.modal-card { width: min(620px, 100%); max-height: 90vh; overflow: auto; padding: 25px; border-radius: 8px; background: #fff; }
.modal-actions { display: flex; justify-content: space-between; margin-top: 24px; }
.course-selectors { display: grid; grid-template-columns: 1fr auto 1fr; gap: 28px; align-items: end; }
.course-selectors .or { padding-bottom: 24px; color: var(--online-orange); font-size: 24px; font-weight: 700; }
.faq { margin: 28px 0; }
.faq h3 { color: var(--online-orange); font-size: 20px; }
.legal-table { width: 100%; border-collapse: collapse; }
.legal-table th, .legal-table td { padding: 14px; border: 1px solid #ddd; vertical-align: top; }
.legal-table th { width: 28%; background: #f6f5ff; text-align: left; }
.thank-you { max-width: 780px; margin: 50px auto; text-align: center; }

@media (max-width: 767px) {
    body { font-size: 16px; }
    .section { padding: 48px 18px; }
    .desktop-nav > a:not(.button) { display: none; }
    .mobile-menu { display: block; }
    .mobile-menu summary { width: 24px; cursor: pointer; list-style: none; }
    .mobile-menu summary span { display: block; height: 2px; margin: 6px 0; background: var(--online-purple); }
    .mobile-menu nav { position: absolute; left: 0; top: 56px; width: 280px; padding: 20px; display: flex; flex-direction: column; background: var(--online-purple); }
    .mobile-menu nav a { padding: 10px; color: #fff; text-decoration: none; }
    .header-inner { min-height: 56px; padding: 4px 16px; gap: 12px; }
    .brand { min-width: 0; }
    .brand img { width: 150px; }
    .desktop-nav { margin-left: auto; gap: 0; }
    .desktop-nav .button-small { height: 36px; padding: 0 16px; font-size: 12px; line-height: 36px; white-space: nowrap; }
    .hero-grid, .feature-grid, .course-overview { grid-template-columns: 1fr; }
    .hero { padding: 0 0 30px; }
    .hero-grid { display: flex; flex-direction: column; gap: 0; }
    .hero-copy { order: 1; padding: 0 20px; text-align: center; }
    .hero-copy h1 { margin-top: 0; font-size: 24px; }
    .hero-image { order: 2; margin-top: 16px; }
    .page-hero { padding: 0 18px; }
    .page-hero .section-title { margin: 0; }
    .course-hero, .feature-grid > img { display: none; }
    .course-features { padding-top: 0; }
    .promise-grid, .voice-grid, .teacher-grid, .class-grid { grid-template-columns: 1fr; }
    .footer-trial, .cta, .footer-bottom { flex-direction: column; align-items: flex-start; }
    .footer-links { flex-wrap: wrap; }
    .form-grid { grid-template-columns: 1fr; gap: 0; }
    .course-selectors { grid-template-columns: 1fr; gap: 4px; }
    .course-selectors .or { padding: 0; text-align: center; }
    .legal-table th, .legal-table td { display: block; width: 100%; }
}