.grammar-mastery {
    margin: 1.5rem auto;
    padding: 1.5rem;
    border: 1px solid #dce7f7;
    border-radius: 24px;
    background: linear-gradient(145deg, #f8fbff 0%, #ffffff 55%, #f2fbff 100%);
    box-shadow: 0 16px 44px rgba(15, 65, 125, 0.08);
}

.grammar-mastery__heading,
.grammar-mastery__levels-head,
.grammar-mastery__card-head,
.grammar-mastery__comparison,
.grammar-mastery__actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.grammar-mastery__heading > div > span,
.grammar-mastery__levels-head > div > span {
    display: block;
    margin-bottom: 0.25rem;
    color: #1673d2;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.grammar-mastery__heading h2,
.grammar-mastery__levels-head h3,
.grammar-mastery__card h3 {
    margin: 0;
    color: #14335c;
}

.grammar-mastery__heading > a {
    color: #0d65c2;
    font-weight: 700;
    text-decoration: none;
}

.grammar-mastery__overview {
    display: grid;
    grid-template-columns: 1.35fr 0.8fr 1fr;
    gap: 1rem;
    margin-top: 1.25rem;
}

.grammar-mastery__card {
    min-width: 0;
    padding: 1.25rem;
    border: 1px solid #dfeaf7;
    border-radius: 20px;
    background: #ffffff;
}

.grammar-mastery__card--estimate {
    border-top: 4px solid #1769d2;
}

.grammar-mastery__card--trend {
    border-top: 4px solid #0b9d8a;
}

.grammar-mastery__card--next {
    border-top: 4px solid #e58a16;
}

.grammar-mastery__card-head > span {
    color: #47627e;
    font-size: 0.86rem;
    font-weight: 800;
}

.grammar-mastery__card-head i {
    margin-right: 0.35rem;
}

.grammar-mastery__confidence,
.grammar-mastery__trend {
    padding: 0.32rem 0.55rem;
    border-radius: 999px;
    background: #eef5fb;
    color: #44617c;
    font-size: 0.72rem;
    font-weight: 800;
    white-space: nowrap;
}

.grammar-mastery__confidence.is-high,
.grammar-mastery__trend.is-improving {
    background: #e5f8f1;
    color: #087a60;
}

.grammar-mastery__confidence.is-medium,
.grammar-mastery__trend.is-stable {
    background: #eaf4ff;
    color: #1769b9;
}

.grammar-mastery__confidence.is-low,
.grammar-mastery__trend.is-building {
    background: #fff3dd;
    color: #9b5b07;
}

.grammar-mastery__confidence.is-insufficient,
.grammar-mastery__trend.is-declining {
    background: #fff0ed;
    color: #b3422f;
}

.grammar-mastery__estimate-value {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.1rem 0;
}

.grammar-mastery__estimate-value > strong {
    display: grid;
    width: 76px;
    height: 76px;
    place-items: center;
    flex: 0 0 76px;
    border-radius: 20px;
    background: #1268ca;
    color: #ffffff;
    font-size: 1.8rem;
    line-height: 1;
}

.grammar-mastery__estimate-value div {
    display: grid;
    gap: 0.3rem;
}

.grammar-mastery__estimate-value b {
    color: #18395f;
    font-size: 1rem;
}

.grammar-mastery__estimate-value span,
.grammar-mastery__card p,
.grammar-mastery__disclaimer,
.grammar-mastery__signin span {
    color: #60778f;
    line-height: 1.55;
}

.grammar-mastery__evidence {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
}

.grammar-mastery__evidence span {
    padding: 0.7rem;
    border-radius: 12px;
    background: #f3f8fd;
    color: #62788e;
    font-size: 0.75rem;
}

.grammar-mastery__evidence b {
    display: block;
    margin-bottom: 0.12rem;
    color: #173f69;
    font-size: 1rem;
}

.grammar-mastery__disclaimer {
    margin: 0.9rem 0 0;
    font-size: 0.72rem;
}

.grammar-mastery__trend-score {
    display: flex;
    align-items: baseline;
    gap: 0.65rem;
    margin: 1.3rem 0 0.4rem;
}

.grammar-mastery__trend-score strong {
    color: #0d7f70;
    font-size: 2.35rem;
    line-height: 1;
}

.grammar-mastery__trend-score span {
    color: #52708a;
    font-size: 0.82rem;
    font-weight: 800;
}

.grammar-mastery__comparison {
    align-items: stretch;
    margin-top: 1rem;
}

.grammar-mastery__comparison span {
    flex: 1;
    padding: 0.65rem;
    border-radius: 12px;
    background: #f3faf8;
    color: #637b8c;
    font-size: 0.72rem;
}

.grammar-mastery__comparison b {
    display: block;
    margin-top: 0.15rem;
    color: #176b60;
    font-size: 0.95rem;
}

.grammar-mastery__card--next h3 {
    margin-top: 1.25rem;
    font-size: 1.15rem;
}

.grammar-mastery__actions {
    justify-content: flex-start;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.grammar-mastery__actions a,
.grammar-mastery__signin a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0.6rem 0.9rem;
    border-radius: 12px;
    font-size: 0.82rem;
    font-weight: 800;
    text-decoration: none;
}

.grammar-mastery__primary {
    background: #e17f0c;
    color: #ffffff;
}

.grammar-mastery__secondary {
    border: 1px solid #d4e2f0;
    background: #ffffff;
    color: #315878;
}

.grammar-mastery__levels {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #e3edf7;
}

.grammar-mastery__levels-head small {
    max-width: 360px;
    color: #70849a;
    text-align: right;
}

.grammar-mastery__level-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: 1rem;
}

.grammar-mastery__level {
    display: grid;
    gap: 0.55rem;
    padding: 0.9rem;
    border: 1px solid #e2eaf3;
    border-radius: 16px;
    background: #ffffff;
}

.grammar-mastery__level > div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
}

.grammar-mastery__level strong {
    color: #153f70;
    font-size: 1.05rem;
}

.grammar-mastery__level span {
    color: #76899c;
    font-size: 0.66rem;
    text-align: right;
}

.grammar-mastery__level > b {
    color: #183d65;
    font-size: 1.25rem;
}

.grammar-mastery__level > small {
    color: #7b8e9f;
}

.grammar-mastery__level.is-mastered {
    border-color: #b9e7d8;
    background: #f1fbf7;
}

.grammar-mastery__level.is-strong {
    border-color: #bcdcf8;
    background: #f1f8ff;
}

.grammar-mastery__level.is-developing,
.grammar-mastery__level.is-insufficient {
    border-color: #f0d9ac;
    background: #fffaf0;
}

.grammar-mastery__level.is-review {
    border-color: #efc2b8;
    background: #fff6f3;
}

.grammar-mastery__signin {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-top: 1rem;
    padding: 1rem;
    border: 1px dashed #bcd3eb;
    border-radius: 16px;
    background: #f5faff;
}

.grammar-mastery__signin > i {
    color: #1769c4;
    font-size: 1.5rem;
}

.grammar-mastery__signin > div {
    display: grid;
    gap: 0.2rem;
    flex: 1;
}

.grammar-mastery__signin strong {
    color: #173e66;
}

.grammar-mastery__signin a {
    background: #1268ca;
    color: #ffffff;
}

.grammar-mastery__weak-item {
    gap: 1rem;
}

.grammar-mastery__weak-item > div:first-child small,
.grammar-mastery__attempt-item small {
    display: block;
    margin-top: 0.2rem;
    color: #8192a3;
}

.grammar-mastery__weak-score {
    display: grid;
    justify-items: end;
}

.grammar-mastery__weak-score a {
    margin-top: 0.35rem;
    color: #1268ca;
    font-size: 0.75rem;
    font-weight: 800;
    text-decoration: none;
}

@media (max-width: 1100px) {
    .grammar-mastery__overview {
        grid-template-columns: 1fr 1fr;
    }

    .grammar-mastery__card--estimate {
        grid-column: 1 / -1;
    }

    .grammar-mastery__level-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .grammar-mastery {
        padding: 1rem;
        border-radius: 18px;
    }

    .grammar-mastery__heading,
    .grammar-mastery__levels-head,
    .grammar-mastery__card-head,
    .grammar-mastery__signin {
        align-items: flex-start;
        flex-direction: column;
    }

    .grammar-mastery__overview {
        grid-template-columns: 1fr;
    }

    .grammar-mastery__card--estimate {
        grid-column: auto;
    }

    .grammar-mastery__evidence,
    .grammar-mastery__level-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grammar-mastery__levels-head small {
        max-width: none;
        text-align: left;
    }

    .grammar-mastery__signin a {
        width: 100%;
    }
}

@media (max-width: 460px) {
    .grammar-mastery__estimate-value {
        align-items: flex-start;
        flex-direction: column;
    }

    .grammar-mastery__evidence,
    .grammar-mastery__level-grid {
        grid-template-columns: 1fr;
    }

    .grammar-mastery__comparison {
        flex-direction: column;
    }

    .grammar-mastery__actions a {
        width: 100%;
    }
}

/* Grammar Professional V8 — Active Mastery Loop */
.grammar-mastery__loop {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
    gap: 1rem;
    margin: 1rem 0 1.2rem;
    padding: 1rem;
    border: 1px solid #d9e6f3;
    border-radius: 18px;
    background: linear-gradient(145deg, #f8fbff 0%, #ffffff 100%);
}

.grammar-mastery__loop-copy > span {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: #1268ca;
    font-size: 0.72rem;
    font-weight: 850;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.grammar-mastery__loop-copy h3 {
    margin: 0.35rem 0;
    color: #183b5b;
    font-size: 1.08rem;
}

.grammar-mastery__loop-copy p {
    margin: 0;
    color: #61768a;
    font-size: 0.84rem;
    line-height: 1.55;
}

.grammar-mastery__loop-copy a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.7rem;
    color: #1268ca;
    font-size: 0.78rem;
    font-weight: 800;
    text-decoration: none;
}

.grammar-mastery__loop-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
}

.grammar-mastery__loop-stats div {
    padding: 0.7rem;
    border: 1px solid #e2eaf2;
    border-radius: 13px;
    background: #fff;
}

.grammar-mastery__loop-stats span,
.grammar-mastery__loop-stats strong {
    display: block;
}

.grammar-mastery__loop-stats span {
    color: #72869a;
    font-size: 0.66rem;
    font-weight: 700;
}

.grammar-mastery__loop-stats strong {
    margin-top: 0.2rem;
    color: #183b5b;
    font-size: 1.12rem;
}

.grammar-mastery__loop-stats .is-delta strong {
    color: #1d7b4c;
}

@media (max-width: 850px) {
    .grammar-mastery__loop {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 460px) {
    .grammar-mastery__loop-stats {
        grid-template-columns: 1fr;
    }
}