:root {
  --color-bg: #f4f9f8;
  --color-blue: #2b6cb0;
  --color-blue-dark: #1f5490;
  --color-green: #38a169;
  --color-orange: #f0954b;
  --color-text: #22303a;
  --color-text-light: #6b7c85;
  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-soft: 0 10px 28px rgba(43, 108, 176, .1);
  --font-base: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-base); color: var(--color-text); background: var(--color-bg); line-height: 1.8; -webkit-font-smoothing: antialiased; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }
img { max-width: 100%; display: block; }

.portfolio-badge { background: var(--color-blue-dark); color: #fff; text-align: center; font-size: 12px; padding: 6px 12px; letter-spacing: .05em; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(244, 249, 248, .94); backdrop-filter: blur(6px); border-bottom: 1px solid rgba(0, 0, 0, .05); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.logo { font-size: 20px; font-weight: 800; letter-spacing: .04em; color: var(--color-blue-dark); }
.logo span { color: var(--color-green); }
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav ul { display: flex; gap: 22px; font-size: 14px; }
.site-nav a:hover { color: var(--color-blue); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-text); display: block; }

/* Buttons */
.btn { display: inline-block; padding: 14px 28px; border-radius: 10px; font-size: 14px; font-weight: 700; transition: transform .2s ease, box-shadow .2s ease; }
.btn-lg { padding: 16px 32px; font-size: 15px; }
.btn-primary { background: var(--color-orange); color: #1a2b3c; box-shadow: var(--shadow-soft); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-outline { border: 2px solid var(--color-blue); color: var(--color-blue-dark); }
.btn-outline-light { border: 2px solid #fff; color: #fff; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 96px 0 70px; text-align: center; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(circle at 15% 20%, rgba(43, 108, 176, .12) 0%, transparent 55%), radial-gradient(circle at 85% 15%, rgba(56, 161, 105, .14) 0%, transparent 50%), linear-gradient(180deg, #f4f9f8 0%, #eef7f4 100%); z-index: -1; }
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero-eyebrow { color: var(--color-blue-dark); font-weight: 700; letter-spacing: .12em; font-size: 13px; margin-bottom: 12px; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.5; font-weight: 800; margin-bottom: 20px; }
.hero-lead { color: var(--color-text-light); font-size: 15px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 36px; }
.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat-num { font-size: 30px; font-weight: 800; color: var(--color-blue-dark); }
.stat-label { font-size: 12px; color: var(--color-text-light); }

/* Sections */
section { padding: 80px 0; }
.section-title { text-align: center; font-size: clamp(22px, 3.4vw, 30px); font-weight: 800; margin-bottom: 12px; color: var(--color-blue-dark); }
.section-lead { text-align: center; color: var(--color-text-light); margin-bottom: 44px; }

/* Worries */
.worries { background: #fff; }
.worry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.worry-card { background: var(--color-bg); border-radius: var(--radius-md); padding: 26px 22px; box-shadow: var(--shadow-soft); border-top: 4px solid var(--color-green); }
.worry-card h3 { font-size: 15px; margin-bottom: 8px; }
.worry-card p { font-size: 13px; color: var(--color-text-light); }

/* Course */
.course-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.course-card { background: #fff; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-soft); }
.course-thumb { height: 100px; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 14px; }
.thumb-1 { background: linear-gradient(135deg, var(--color-blue), var(--color-blue-dark)); }
.thumb-2 { background: linear-gradient(135deg, var(--color-green), #276749); }
.thumb-3 { background: linear-gradient(135deg, #4299e1, var(--color-green)); }
.thumb-4 { background: linear-gradient(135deg, var(--color-orange), #dd6b20); }
.course-card h3 { padding: 18px 18px 8px; font-size: 15px; }
.course-card p { padding: 0 18px 20px; font-size: 13px; color: var(--color-text-light); }

/* Price table */
.price { background: var(--color-bg); }
.price-table-wrap { overflow-x: auto; }
.price-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-soft); }
.price-table th, .price-table td { padding: 16px; text-align: center; font-size: 13px; border-bottom: 1px solid #e2e8f0; }
.price-table th { background: var(--color-blue-dark); color: #fff; font-weight: 700; }
.price-table th.highlight { background: var(--color-orange); color: #1a2b3c; }
.price-table td.highlight { background: #fff6ec; font-weight: 700; }
.price-table td:first-child, .price-table th:first-child { text-align: left; font-weight: 700; }

/* Result */
.result { background: #fff; }
.result-stats { display: flex; justify-content: center; gap: 50px; flex-wrap: wrap; margin-bottom: 44px; text-align: center; }
.result-stat span { display: block; font-size: 32px; font-weight: 800; color: var(--color-green); }
.voice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.voice-card { background: var(--color-bg); border-radius: var(--radius-md); padding: 26px; box-shadow: var(--shadow-soft); }
.voice-comment { font-size: 14px; margin-bottom: 14px; }
.voice-name { font-size: 12px; color: var(--color-text-light); }
.disclaimer-inline { text-align: center; font-size: 11px; color: var(--color-text-light); margin-top: 24px; }

/* Teacher */
.teacher-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.teacher-card { background: #fff; border-radius: var(--radius-lg); padding: 0 0 20px; text-align: center; box-shadow: var(--shadow-soft); overflow: hidden; }
.teacher-thumb { height: 140px; margin-bottom: 16px; }
.t1 { background: linear-gradient(135deg, var(--color-blue), #63b3ed); }
.t2 { background: linear-gradient(135deg, var(--color-green), #68d391); }
.t3 { background: linear-gradient(135deg, var(--color-orange), #f6c177); }
.teacher-card h3 { font-size: 15px; margin-bottom: 6px; }
.teacher-card p { font-size: 12px; color: var(--color-text-light); padding: 0 16px; }

/* FAQ */
.faq { background: var(--color-bg); }
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: #fff; border-radius: var(--radius-md); box-shadow: var(--shadow-soft); overflow: hidden; }
.faq-question { width: 100%; text-align: left; background: none; border: none; padding: 20px 24px; font-size: 14px; font-weight: 700; cursor: pointer; position: relative; }
.faq-question::after { content: "+"; position: absolute; right: 24px; top: 50%; transform: translateY(-50%); font-size: 20px; color: var(--color-green); }
.faq-item.is-open .faq-question::after { content: "−"; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .3s ease; font-size: 13px; color: var(--color-text-light); }
.faq-answer p { padding: 0 24px 20px; }
.faq-item.is-open .faq-answer { max-height: 200px; }

/* Trial CTA */
.trial-cta { background: linear-gradient(120deg, var(--color-blue), var(--color-green)); color: #fff; text-align: center; }
.trial-inner h2 { font-size: clamp(22px, 3.4vw, 30px); font-weight: 800; margin-bottom: 12px; }
.trial-inner p { margin-bottom: 30px; opacity: .95; }

/* Footer */
.site-footer { background: #1a2b3c; color: #d7e3ea; padding: 56px 0 24px; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 30px; font-size: 13px; }
.footer-logo { font-size: 18px; font-weight: 800; margin-bottom: 10px; color: #fff; }
.footer-logo span { color: var(--color-orange); }
.footer-nav { display: flex; flex-direction: column; gap: 10px; font-size: 13px; }
.footer-disclaimer { max-width: 1080px; margin: 40px auto 0; padding: 0 24px; font-size: 11px; opacity: .7; }

/* Sticky CTA */
.sticky-cta { position: fixed; left: 0; right: 0; bottom: -80px; background: var(--color-orange); color: #1a2b3c; text-align: center; padding: 16px; font-weight: 800; font-size: 14px; box-shadow: 0 -6px 20px rgba(0, 0, 0, .15); transition: bottom .3s ease; z-index: 60; }
.sticky-cta.is-visible { bottom: 0; }

/* Responsive */
@media (max-width: 900px) {
  .worry-grid, .course-grid, .voice-grid, .teacher-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .site-nav { position: fixed; top: 58px; left: 0; right: 0; background: #fff; flex-direction: column; align-items: flex-start; padding: 20px 24px; gap: 16px; transform: translateY(-140%); transition: transform .25s ease; box-shadow: var(--shadow-soft); }
  .site-nav.is-open { transform: translateY(0); }
  .site-nav ul { flex-direction: column; gap: 14px; }
  .nav-toggle { display: flex; }
  .price-table th, .price-table td { font-size: 12px; padding: 10px; }
}
@media (max-width: 560px) {
  .worry-grid, .course-grid, .voice-grid, .teacher-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; }
  .result-stats { gap: 28px; }
}