.page-header-box {
    background: linear-gradient(135deg, #ADF5F7, #FAE8FD);
    border-radius: 14px;
    padding: 14px 16px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 1px solid #080CC9;
    /* shadow nhẹ */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06), inset 0 1px 4px rgba(255,255,255,0.6);
}

    /* ánh sáng chạy rất nhẹ */
    .page-header-box::before {
        content: "";
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: linear-gradient( 120deg, transparent, rgba(255,255,255,0.2), transparent );
        transform: rotate(25deg);
        animation: shine 6s linear infinite;
    }

@keyframes shine {
    0% {
        transform: translateX(-120%) rotate(25deg);
    }

    100% {
        transform: translateX(120%) rotate(25deg);
    }
}

.page-header-title {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 700;
    font-size: 1.6rem;
    letter-spacing: 0.5px;
    margin: 0;
    /* giữ nguyên gradient màu */
    background: linear-gradient(90deg, #0A0EF5, #050671);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    /* ✨ Text 3D multi-layer shadow */
    text-shadow: 1px 1px 0 rgba(0,0,0,0.15), 2px 2px 0 rgba(0,0,0,0.1), 3px 3px 6px rgba(0,0,0,0.2), 0 0 6px rgba(10,14,245,0.3); /* glow nhẹ từ màu chính */
    /* giữ chiều sâu nhưng vẫn sắc nét */
    position: relative;
    z-index: 2;
}

/* ===== GẠCH CHÂN ===== */
.page-underline {
    width: 160px;
    height: 2px;
    margin: 8px auto 0;
    background: linear-gradient(90deg, #93c5fd, #60a5fa);
    border-radius: 999px;
    box-shadow: 0 0 6px rgba(96, 165, 250, 0.3);
}

/* ===== Tieu đề trang bảng thời khóa biểu ===== */
.tkb-hero {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    border-radius: 18px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #d1fae5, #ecfdf5);
    border: 1px solid #bbf7d0;
}

    .tkb-hero h2 {
        margin: 0;
        font-weight: 700;
        color: #065f46;
    }

    .tkb-hero .sub {
        font-size: 0.85rem;
        color: #047857;
    }

.hero-stats {
    display: flex;
    gap: 16px;
}

.stat {
    text-align: center;
    background: white;
    padding: 8px 14px;
    border-radius: 12px;
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}