:root{
  --purple:#4b22a8;
  --blue:#2f82db;
  --cyan:#2fd3ef;
  --ink:#172033;
  --muted:#65728a;
  --line:#e8edf7;
  --bg:#f7fbff;
  --white:#fff;
  --shadow:0 24px 70px rgba(43,88,180,.16);
  --radius:28px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",Meiryo,sans-serif;color:var(--ink);background:#fff;line-height:1.75}
a{text-decoration:none;color:inherit}
.container{width:min(1120px,calc(100% - 40px));margin:0 auto}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(232,237,247,.7)}.header-inner{height:76px;display:flex;align-items:center;justify-content:space-between}.brand img{width:150px;display:block}.nav{display:flex;gap:28px;align-items:center;font-weight:700;font-size:14px}.nav a{color:#33405a}.nav-cta{padding:10px 18px;border-radius:999px;background:linear-gradient(90deg,var(--purple),var(--blue),var(--cyan));color:#fff!important}.hero{position:relative;overflow:hidden;padding:90px 0 80px;background:radial-gradient(circle at 15% 10%,rgba(47,211,239,.24),transparent 34%),radial-gradient(circle at 84% 16%,rgba(75,34,168,.18),transparent 36%),linear-gradient(180deg,#fff 0%,#f6fbff 100%)}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center}.eyebrow{margin:0 0 14px;color:var(--blue);font-weight:900;letter-spacing:.12em;font-size:13px}.hero h1{font-size:clamp(42px,5vw,68px);line-height:1.08;margin:0 0 24px;letter-spacing:-.04em}.hero h1 span{background:linear-gradient(90deg,var(--purple),var(--blue),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}.lead{font-size:18px;color:#46536b;margin:0 0 30px}.button{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:14px 24px;font-weight:900;box-shadow:0 12px 30px rgba(47,130,219,.16)}.primary{background:linear-gradient(90deg,var(--purple),var(--blue),var(--cyan));color:white}.secondary{background:#fff;color:var(--blue);border:1px solid var(--line)}.large{padding:17px 34px;font-size:17px}.hero-actions{display:flex;gap:14px;flex-wrap:wrap}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:34px}.hero-stats div{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:0 10px 30px rgba(32,83,161,.08)}.hero-stats strong{display:block;font-size:30px;line-height:1;color:var(--purple)}.hero-stats span{display:block;font-size:12px;color:var(--muted);margin-top:8px;font-weight:700}.hero-visual{position:relative;min-height:560px}.phone{position:absolute;left:50%;top:36px;transform:translateX(-50%);width:286px;height:530px;border:12px solid #141b2d;border-radius:42px;background:linear-gradient(180deg,#fff,#eef9ff);box-shadow:var(--shadow);padding:28px 18px}.phone-top{width:86px;height:7px;background:#151b29;border-radius:999px;margin:0 auto 22px}.phone-logo{width:178px;display:block;margin:0 auto 24px}.app-card{background:#fff;border:1px solid var(--line);border-radius:20px;margin:14px 0;padding:18px 16px;font-weight:900;box-shadow:0 10px 26px rgba(43,88,180,.08)}.app-card span{display:block;font-size:12px;color:var(--muted);font-weight:700}.app-card.active{background:linear-gradient(135deg,rgba(75,34,168,.95),rgba(47,130,219,.95));color:#fff}.app-card.active span{color:#dff6ff}.teacher-card,.student-card{position:absolute;width:190px;border-radius:24px;background:#fff;border:1px solid var(--line);padding:22px;box-shadow:var(--shadow);font-weight:900}.teacher-card{right:0;top:96px}.student-card{left:0;bottom:72px}.teacher-card span,.student-card span{display:block;color:var(--muted);font-size:13px;font-weight:700}.network{position:absolute;border-radius:50%;filter:blur(.2px);background:radial-gradient(circle,rgba(47,211,239,.35),transparent 60%)}.network-a{width:420px;height:420px;right:-70px;bottom:20px}.section{padding:90px 0}.section-heading{max-width:760px;margin:0 auto 42px;text-align:center}.section-heading h2,.split h2,.cta h2{font-size:clamp(30px,3.4vw,46px);line-height:1.25;margin:0 0 18px;letter-spacing:-.03em}.section-heading p,.split p,.cta p{color:var(--muted);margin:0}.problem{background:#fff}.problem-grid,.feature-grid,.benefit-grid{display:grid;gap:18px}.problem-grid{grid-template-columns:repeat(4,1fr)}article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 12px 34px rgba(43,88,180,.07)}article span{display:inline-flex;width:42px;height:42px;border-radius:14px;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(75,34,168,.12),rgba(47,211,239,.18));color:var(--purple);font-weight:900}article h3{margin:18px 0 8px;font-size:20px}article p{margin:0;color:var(--muted);font-size:15px}.solution{background:linear-gradient(180deg,#f7fbff,#fff)}.split{display:grid;grid-template-columns:.9fr 1.1fr;gap:50px;align-items:center}.role-box{display:grid;grid-template-columns:1fr auto 1fr;gap:18px;align-items:center}.role-box>div:not(.cross){background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}.role-box h3{font-size:26px;margin:0 0 10px;color:var(--purple)}.cross{font-size:34px;font-weight:900;color:var(--blue)}.features{background:#fff}.feature-grid{grid-template-columns:repeat(3,1fr)}.cycle{background:linear-gradient(135deg,rgba(75,34,168,.92),rgba(47,130,219,.92),rgba(47,211,239,.86));color:#fff}.cycle .eyebrow,.cycle .section-heading p{color:#e7fbff}.cycle-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.cycle-grid div{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);padding:30px;backdrop-filter:blur(8px)}.cycle-grid strong{font-size:28px}.cycle-grid p{margin:12px 0 0;color:#eefcff}.benefits{background:#f7fbff}.benefit-grid{grid-template-columns:repeat(3,1fr)}.cta{padding:90px 0;background:radial-gradient(circle at 30% 0,rgba(47,211,239,.22),transparent 36%),#fff;text-align:center}.cta-inner{max-width:790px}.note{font-size:13px;margin-top:16px!important}.footer{padding:34px 0;border-top:1px solid var(--line)}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--muted);font-size:13px}.footer img{width:120px}
@media (max-width:900px){.nav a:not(.nav-cta){display:none}.hero{padding-top:62px}.hero-grid,.split{grid-template-columns:1fr}.hero-visual{min-height:520px}.problem-grid,.feature-grid,.benefit-grid,.cycle-grid{grid-template-columns:1fr 1fr}.role-box{grid-template-columns:1fr}.cross{text-align:center}.teacher-card{right:10px}.student-card{left:10px}.hero-stats{grid-template-columns:1fr}}
@media (max-width:620px){.container{width:min(100% - 28px,1120px)}.header-inner{height:66px}.brand img{width:126px}.hero h1{font-size:40px}.lead{font-size:16px}.button{width:100%}.hero-visual{min-height:520px;transform:scale(.86);transform-origin:top center;margin-bottom:-72px}.phone{width:270px}.teacher-card,.student-card{width:160px;padding:18px}.problem-grid,.feature-grid,.benefit-grid,.cycle-grid{grid-template-columns:1fr}.section{padding:68px 0}.footer-inner{flex-direction:column}}