/* =========================================================
   AiTeacher.css
   東和AI先生：AI先生とは 页面
   B2B向け / 教育機関向け
   ========================================================= */

.ai-teacher-page {
    overflow: hidden;
    background: #ffffff;
    color: #0f172a;
}

.ai-teacher-hero,
.ai-teacher-soft-section {
    position: relative;
    background:
        radial-gradient(circle at 8% 12%, rgba(37, 99, 235, .10), transparent 34%),
        radial-gradient(circle at 88% 6%, rgba(14, 165, 233, .12), transparent 32%),
        linear-gradient(135deg, #f8fbff 0%, #eef6ff 54%, #ffffff 100%);
}

.ai-teacher-white-section {
    position: relative;
    background: #ffffff;
}

.ai-teacher-kicker,
.ai-teacher-section-kicker {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    color: #2563eb;
    font-weight: 900;
    letter-spacing: .08em;
    font-size: .85rem;
}

.ai-teacher-kicker {
    border: 1px solid rgba(37, 99, 235, .14);
    background: rgba(37, 99, 235, .08);
    border-radius: 999px;
    padding: .55rem 1rem;
    box-shadow: 0 12px 30px rgba(37, 99, 235, .08);
}

.ai-teacher-hero-title {
    font-size: clamp(2.2rem, 4.8vw, 4.8rem);
    letter-spacing: -.055em;
    line-height: 1.08;
}

.ai-teacher-hero-lead {
    max-width: 840px;
    font-size: 1.06rem;
    line-height: 2.05;
    color: #5b6472;
}

.ai-teacher-section-title {
    font-size: clamp(1.85rem, 3vw, 3rem);
    letter-spacing: -.04em;
    line-height: 1.28;
}

.ai-teacher-tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: .65rem;
}

.ai-teacher-tag-list span,
.ai-teacher-mini-tag {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(37, 99, 235, .13);
    background: rgba(255, 255, 255, .78);
    color: #334155;
    border-radius: 999px;
    padding: .45rem .82rem;
    font-size: .84rem;
    font-weight: 800;
    box-shadow: 0 8px 20px rgba(15, 23, 42, .04);
}

.ai-teacher-demo-card,
.ai-teacher-feature-card,
.ai-teacher-flow-card,
.ai-teacher-mini-card,
.ai-teacher-message-card {
    border: 1px solid rgba(15, 23, 42, .08);
    background: rgba(255, 255, 255, .92);
    box-shadow: 0 18px 45px rgba(15, 23, 42, .08);
}

.ai-teacher-demo-card {
    position: relative;
    overflow: hidden;
    border-radius: 2rem;
    padding: 1.4rem;
}

.ai-teacher-demo-card::before {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    right: -90px;
    top: -90px;
    border-radius: 999px;
    background: rgba(37, 99, 235, .16);
}


.ai-teacher-portrait-panel {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 112px 1fr;
    gap: 1rem;
    align-items: center;
    padding: 1rem;
    border-radius: 1.6rem;
    background: rgba(255, 255, 255, .86);
    border: 1px solid rgba(37, 99, 235, .12);
    box-shadow: 0 18px 40px rgba(15, 23, 42, .08);
}

.ai-teacher-portrait-img {
    width: 112px;
    height: 112px;
    display: block;
    object-fit: cover;
    object-position: center;
    border-radius: 28px;
    border: 4px solid #ffffff;
    box-shadow: 0 18px 34px rgba(37, 99, 235, .18);
    background: #ffffff;
}

.ai-teacher-portrait-copy {
    min-width: 0;
}

.ai-teacher-avatar-image {
    overflow: hidden;
    padding: 0;
    background: #ffffff;
    border: 3px solid #ffffff;
}

.ai-teacher-avatar-image img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
}

.ai-teacher-demo-header,
.ai-teacher-chat,
.ai-teacher-powered {
    position: relative;
    z-index: 1;
}

.ai-teacher-demo-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.3rem;
}

.ai-teacher-avatar {
    width: 58px;
    height: 58px;
    border-radius: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.5rem;
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    box-shadow: 0 16px 34px rgba(37, 99, 235, .26);
    flex: 0 0 auto;
}

.ai-teacher-status {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #047857;
    background: rgba(209, 250, 229, .86);
    border: 1px solid rgba(16, 185, 129, .24);
    border-radius: 999px;
    padding: .45rem .7rem;
    font-size: .76rem;
    font-weight: 900;
    white-space: nowrap;
}

.ai-teacher-chat {
    display: grid;
    gap: .85rem;
}

.ai-teacher-bubble {
    border-radius: 1.35rem;
    padding: 1rem 1.1rem;
    font-weight: 700;
    line-height: 1.75;
}

.ai-teacher-bubble-school {
    margin-left: auto;
    max-width: 88%;
    color: #ffffff;
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    border-radius: 1.35rem 1.35rem .45rem 1.35rem;
}

.ai-teacher-bubble-ai {
    max-width: 92%;
    color: #475569;
    background: #ffffff;
    border: 1px solid rgba(226, 232, 240, .9);
    border-radius: 1.35rem 1.35rem 1.35rem .45rem;
}

.ai-teacher-bubble-ai.light {
    background: #f8fafc;
}

.ai-teacher-powered {
    margin-top: 1rem;
    padding: .85rem 1rem;
    border-radius: 1rem;
    color: #64748b;
    background: rgba(248, 250, 252, .82);
    border: 1px solid rgba(226, 232, 240, .86);
    font-size: .84rem;
    font-weight: 800;
    text-align: center;
}

.ai-teacher-feature-card,
.ai-teacher-mini-card {
    border-radius: 1.5rem;
    padding: 1.5rem;
    transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}

.ai-teacher-feature-icon,
.ai-teacher-mini-card i {
    width: 58px;
    height: 58px;
    border-radius: 1.15rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #2563eb;
    background: rgba(37, 99, 235, .08);
    font-size: 1.6rem;
    margin-bottom: 1rem;
}

.ai-teacher-mini-card i {
    font-size: 1.45rem;
}

.ai-teacher-flow-card {
    border-radius: 2rem;
    padding: 1.25rem;
}

.ai-teacher-flow-item {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 1rem;
    padding: 1.2rem;
    border-radius: 1.3rem;
    background: #ffffff;
    border: 1px solid rgba(226, 232, 240, .82);
}

.ai-teacher-flow-item + .ai-teacher-flow-item {
    margin-top: .9rem;
}

.ai-teacher-flow-item span {
    width: 44px;
    height: 44px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    background: #2563eb;
    font-weight: 900;
    box-shadow: 0 12px 24px rgba(37, 99, 235, .20);
}

.ai-teacher-message-card {
    border-radius: 2rem;
    padding: 2rem;
    overflow: hidden;
    background:
        radial-gradient(circle at 10% 20%, rgba(37, 99, 235, .10), transparent 34%),
        linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
}

@media (hover: hover) and (pointer: fine) {
    .ai-teacher-feature-card:hover,
    .ai-teacher-mini-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 24px 56px rgba(15, 23, 42, .12);
        border-color: rgba(37, 99, 235, .18);
    }
}

@media (max-width: 991.98px) {
    .ai-teacher-hero-title {
        font-size: clamp(2.1rem, 8vw, 3.3rem);
    }

    .ai-teacher-demo-card {
        border-radius: 1.6rem;
    }

    .ai-teacher-message-card {
        padding: 1.5rem;
        border-radius: 1.6rem;
    }
}

@media (max-width: 575.98px) {
    .ai-teacher-portrait-panel {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .ai-teacher-portrait-img {
        margin: 0 auto;
    }

    .ai-teacher-hero-lead {
        font-size: 1rem;
        line-height: 1.9;
    }

    .ai-teacher-demo-header {
        align-items: flex-start;
    }

    .ai-teacher-status {
        display: none;
    }

    .ai-teacher-bubble,
    .ai-teacher-bubble-school,
    .ai-teacher-bubble-ai {
        max-width: 100%;
    }

    .ai-teacher-flow-item {
        grid-template-columns: 1fr;
    }
}