/* GIAO DIỆN SOFT BRUTALISM & NAMESPACED - FRACTION CALCULATOR */
.fraccalc-container {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    max-width: 900px; margin: 20px auto;
    border: 3px solid #111111; border-radius: 12px;
    box-shadow: 6px 6px 0px #111111; padding: 30px;
    background: #ffffff; color: #111111; box-sizing: border-box;
}

.fraccalc-container * { box-sizing: border-box; }

.fraccalc-title {
    font-family: 'Montserrat', sans-serif; font-size: 2rem; text-align: center;
    text-transform: uppercase; margin-top: 0; margin-bottom: 10px; font-weight: 900;
}

.fraccalc-desc { text-align: center; color: #444; font-weight: 600; margin-bottom: 30px; line-height: 1.5; }

.fraccalc-grid { display: flex; flex-direction: column; gap: 30px; }

/* Thẻ Card */
.fraccalc-card {
    border: 3px solid #111111; border-radius: 10px; padding: 25px;
    box-shadow: 4px 4px 0px #111111;
}
.bg-yellow { background-color: #fdfd96; }
.bg-green { background-color: #e2f0cb; }

.fraccalc-card-header {
    font-family: 'Montserrat', sans-serif; font-size: 1.2rem; font-weight: 900;
    margin: 0 0 20px 0; border-bottom: 3px dashed #111; padding-bottom: 10px; text-transform: uppercase;
}

/* Khu vực không gian làm việc */
.fraccalc-workspace {
    display: flex; align-items: center; justify-content: center; gap: 20px; flex-wrap: wrap;
}

/* Khối nhập phân số */
.fraccalc-input-block {
    display: flex; flex-direction: column; width: 100px;
}
.fraccalc-input {
    width: 100%; padding: 12px 10px; font-size: 1.2rem; font-weight: 800; text-align: center;
    font-family: 'Courier New', Courier, monospace; border: 3px solid #111111;
    border-radius: 6px; outline: none; background-color: #fff; box-shadow: inset 2px 2px 0px rgba(0,0,0,0.05);
}
.fraccalc-input:focus { border-color: #2d7bb5; background-color: #e6f7ff; }

.fraccalc-divider {
    border: none; border-top: 3px solid #111; margin: 5px 0; width: 100%;
}

/* Dropdown Phép tính */
.fraccalc-operator-block { display: flex; align-items: center; justify-content: center; }
.fraccalc-select {
    padding: 10px; font-size: 1.5rem; font-weight: 900; border: 3px solid #111;
    border-radius: 6px; background-color: #fff; cursor: pointer; outline: none; box-shadow: 3px 3px 0px #111;
}

/* Nút Hành động */
.fraccalc-btn-action {
    background-color: #111; color: #fff; font-family: 'Montserrat', sans-serif;
    font-weight: 900; font-size: 1.1rem; padding: 15px 20px; border: 3px solid #111; border-radius: 8px;
    cursor: pointer; box-shadow: 3px 3px 0px #666; transition: transform 0.1s;
}
.fraccalc-btn-action:active { transform: translate(3px, 3px); box-shadow: 0px 0px 0px #666; }

/* Khối Kết quả */
.fraccalc-result-block {
    min-width: 120px; background-color: #fff; border: 3px dashed #111; border-radius: 8px;
    padding: 15px; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100px;
}

.fraccalc-empty { font-size: 2rem; font-weight: 900; color: #ccc; }

.fraccalc-fraction-display {
    display: flex; flex-direction: column; align-items: center; font-family: 'Montserrat', monospace;
    font-size: 1.8rem; font-weight: 900; color: #e05a47;
}

.fraccalc-res-num, .fraccalc-res-den { padding: 5px; }
.fraccalc-res-divider { border: none; border-top: 3px solid #e05a47; margin: 0; width: 100%; }

.fraccalc-error {
    margin-top: 15px; color: #e05a47; font-weight: 800; font-size: 0.95rem; text-align: center; display: none;
    background-color: #ffe6e6; border: 2px dashed #e05a47; padding: 10px; border-radius: 6px;
}

@media (max-width: 650px) {
    .fraccalc-workspace { flex-direction: column; gap: 15px; }
    .fraccalc-operator-block, .fraccalc-btn-action { transform: rotate(90deg); margin: 10px 0; }
    .calc-mode { flex-direction: row; flex-wrap: wrap; }
    .calc-mode .fraccalc-btn-action { transform: none; width: 100%; margin-top: 10px; }
}