.classroom-hero { background: #d8f6ef url('/hero.png') center 43%/cover no-repeat; position: relative; }
.classroom-hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(247,252,247,.96), rgba(247,252,247,.78) 55%, rgba(247,252,247,.28)); }
.classroom-hero-inner { position: relative; max-width: 1280px; margin: auto; padding: 84px 32px 94px; }
.classroom-hero h1 { font-size: clamp(46px, 5vw, 72px); line-height: 1.2; letter-spacing: -.05em; margin: 0 0 19px; }
.classroom-hero h1 span { color: var(--sea); }
.classroom-hero-inner > p:last-of-type { max-width: 680px; margin: 0; font-size: 18px; font-weight: 650; line-height: 1.8; }
.classroom-hero-meta { display: inline-flex; align-items: center; gap: 10px; margin-top: 28px; padding: 12px 18px; border-radius: 14px; background: white; box-shadow: 0 8px 24px rgba(4,70,82,.09); }
.classroom-hero-meta strong { font-size: 28px; line-height: 1; }
.classroom-hero-meta span { font-weight: 800; color: var(--ink-soft); }
.classroom-layout { max-width: 1280px; display: grid; grid-template-columns: minmax(320px, .86fr) minmax(0, 1.14fr); gap: 30px; margin: auto; padding: 74px 32px 100px; align-items: start; }
.classroom-section-head .section-kicker { margin-bottom: 8px; }
.classroom-section-head h2 { font-size: clamp(29px, 3vw, 42px); margin: 0 0 25px; letter-spacing: -.04em; }
.classroom-filters { display: grid; grid-template-columns: 1.4fr 1fr; gap: 12px; margin-bottom: 14px; }
.classroom-filters label { display: flex; flex-direction: column; gap: 7px; font-size: 13px; font-weight: 800; }
.classroom-filters input, .classroom-filters select { width: 100%; min-width: 0; min-height: 46px; padding: 9px 12px; border: 1px solid #a4c3c3; border-radius: 11px; background: white; color: var(--ink); font: inherit; }
.classroom-status { margin: 0 0 15px; min-height: 20px; color: var(--ink-soft); font-size: 13px; }
.classroom-list { display: grid; gap: 8px; max-height: 660px; overflow: auto; padding: 2px 8px 4px 2px; }
.classroom-choice { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 17px; border: 1px solid #d6e7e2; border-radius: 14px; background: white; color: var(--ink); text-align: left; cursor: pointer; transition: border-color .2s, background .2s, transform .2s; }
.classroom-choice:hover, .classroom-choice:focus-visible { border-color: var(--sea); transform: translateX(2px); }
.classroom-choice.is-selected { background: #e8f5ed; border-color: var(--sea); }
.classroom-choice strong { font-size: 16px; }
.classroom-choice span { white-space: nowrap; font-size: 13px; font-weight: 800; color: var(--sea); }
.classroom-detail { min-height: 380px; padding: clamp(24px, 3vw, 40px); border: 1px solid #d6e7e2; border-radius: 24px; background: #fffdfa; box-shadow: 0 16px 35px rgba(6,65,75,.1); }
.classroom-empty { display: grid; place-content: center; text-align: center; min-height: 300px; }
.classroom-empty > span { font-size: 44px; color: var(--sea); }
.classroom-empty h2 { margin: 14px 0 7px; font-size: 27px; }
.classroom-empty p { margin: 0; color: var(--ink-soft); }
.classroom-detail-head .section-kicker { margin-bottom: 8px; }
.classroom-detail-head h2 { margin: 0 0 8px; font-size: clamp(29px, 3vw, 42px); letter-spacing: -.04em; }
.classroom-detail-head p:last-child { margin: 0 0 24px; color: var(--ink-soft); }
.classroom-schedule { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 28px; }
.classroom-schedule > div { min-width: 0; padding: 19px; border-radius: 15px; background: #eaf5f1; }
.classroom-schedule span { display: block; margin-bottom: 10px; color: var(--sea); font-size: 13px; font-weight: 900; }
.classroom-schedule p { margin: 0; font-weight: 750; line-height: 1.65; white-space: pre-line; overflow-wrap: anywhere; }
.classroom-links { display: grid; grid-template-columns: 1fr; gap: 13px; }
.classroom-link-card { min-width: 0; padding: 21px; border: 1px solid #d7e9e3; border-radius: 17px; background: white; }
.classroom-link-card small { display: block; font-size: 12px; font-weight: 900; color: var(--sea); letter-spacing: .08em; }
.classroom-link-card h3 { margin: 7px 0 9px; font-size: 23px; }
.classroom-link-card p { min-height: 44px; margin: 0 0 18px; font-size: 13px; line-height: 1.6; color: var(--ink-soft); }
.classroom-link-card a, .classroom-link-card .unavailable { display: block; padding: 12px 14px; border-radius: 10px; text-align: center; font-size: 14px; font-weight: 900; }
.classroom-link-card a { background: var(--ink); color: white; text-decoration: none; }
.classroom-link-card a:hover { filter: brightness(1.12); }
.classroom-link-card .unavailable { background: #eff3f1; color: var(--ink-soft); }
.classroom-teacher-tools { max-width: 1280px; margin: 0 auto; padding: 0 32px 92px; }
.classroom-teacher-head { max-width: 700px; margin-bottom: 27px; }
.classroom-teacher-head .section-kicker { margin-bottom: 9px; }
.classroom-teacher-head h2 { margin: 0 0 12px; font-size: clamp(29px, 3vw, 42px); letter-spacing: -.04em; }
.classroom-teacher-head > p:last-child { margin: 0; color: var(--ink-soft); line-height: 1.8; }
.classroom-teacher-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 17px; }
.classroom-teacher-cards a { display: flex; flex-direction: column; gap: 10px; min-height: 225px; padding: 26px; border: 1px solid #d6e7e2; border-radius: 19px; background: #fffdfa; color: var(--ink); text-decoration: none; box-shadow: 0 10px 28px rgba(6,65,75,.06); }
.classroom-teacher-cards a:hover, .classroom-teacher-cards a:focus-visible { border-color: var(--sea); transform: translateY(-2px); }
.classroom-teacher-cards span { color: var(--sea); font-size: 12px; font-weight: 900; letter-spacing: .08em; }
.classroom-teacher-cards strong { font-size: 27px; }
.classroom-teacher-cards small { flex: 1; font-size: 14px; line-height: 1.7; color: var(--ink-soft); }
.classroom-teacher-cards b { color: var(--sea); font-size: 14px; }
.classroom-help { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 50px; padding: 64px max(32px, calc((100vw - 1216px)/2)); background: #e2f3ee; }
.classroom-help .section-kicker { margin-bottom: 9px; }
.classroom-help h2 { margin: 0; font-size: clamp(27px, 3vw, 39px); line-height: 1.4; }
.classroom-help > p { margin: 0; line-height: 1.8; color: var(--ink-soft); }
@media (max-width: 850px) { .classroom-layout { grid-template-columns: 1fr; } .classroom-list { max-height: 360px; } }
@media (max-width: 720px) { .classroom-hero::before { background: rgba(247,252,247,.86); } .classroom-hero-inner { padding: 62px 22px 70px; } .classroom-hero h1 { font-size: 43px; } .classroom-hero-inner > p:last-of-type { font-size: 16px; } .classroom-layout { padding: 55px 20px 75px; gap: 25px; } .classroom-schedule, .classroom-links, .classroom-teacher-cards { grid-template-columns: 1fr; } .classroom-teacher-tools { padding: 0 20px 70px; } .classroom-help { grid-template-columns: 1fr; gap: 20px; padding: 60px 22px; } }
@media (max-width: 420px) { .classroom-filters { grid-template-columns: 1fr; } .classroom-choice { align-items: flex-start; flex-direction: column; gap: 3px; } }
@media (prefers-reduced-motion: reduce) { .classroom-choice { transition: none; } }