/* =========================================================
   Logical Shifts and Bit Loss
   Secondary Computer Science 1.3.2
   ========================================================= */

.logical-shift-calculation,
.logical-shift-binary-line {
    width: fit-content;
    max-width: 100%;

    margin: 1rem auto;
    padding: 0.85rem 1.25rem;

    border: 1px solid #cbd5e1;
    border-radius: 18px;

    background: #f8fafc;
    color: #0f172a;

    font-family: "Courier New", monospace;
    font-size: 1.18rem;
    font-weight: 900;
    text-align: center;

    overflow-wrap: anywhere;
}

.logical-shift-process-flow {
    display: grid;
    grid-template-columns:
        minmax(150px, 1fr) auto
        minmax(150px, 1fr) auto
        minmax(150px, 1fr) auto
        minmax(150px, 1fr);

    align-items: stretch;
    gap: 0.65rem;

    margin: 1.5rem 0;
}

.logical-shift-process-step {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;

    padding: 1rem;

    border: 1px solid #cbd5e1;
    border-radius: 18px;

    background: #f8fafc;
    color: #334155;
}

.logical-shift-process-step strong {
    color: #0f172a;
}

.logical-shift-process-step p {
    margin: 0;

    font-size: 0.9rem;
    line-height: 1.5;
}

.logical-shift-process-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 30px;
    height: 30px;

    border-radius: 999px;

    background: #5b5fa8;
    color: white;

    font-weight: 900;
}

.logical-shift-process-arrow {
    display: flex;
    align-items: center;
    justify-content: center;

    color: #5b5fa8;
    font-size: 1.45rem;
    font-weight: 900;
}

/* =========================================================
   Static worked diagrams
   ========================================================= */

.logical-shift-static-example {
    max-width: 720px;

    margin: 1.5rem auto;
    padding: 1rem;

    border: 1px solid #cbd5e1;
    border-radius: 20px;

    background: #f8fafc;
}

.logical-shift-static-row {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    align-items: center;
    gap: 0.8rem;
}

.logical-shift-static-label {
    color: #64748b;
    font-size: 0.8rem;
    font-weight: 900;
    text-transform: uppercase;
}

.logical-shift-static-bits {
    padding: 0.75rem;

    border: 1px solid #cbd5e1;
    border-radius: 14px;

    background: white;
    color: #0f172a;

    font-family: "Courier New", monospace;
    font-size: 1.25rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-align: center;
}

.logical-shift-static-arrow {
    margin: 0.65rem 0;
    color: #5b5fa8;
    font-weight: 900;
    text-align: center;
}

/* =========================================================
   Main widget shell
   ========================================================= */

.logical-shift-widget {
    margin: 1.5rem 0;
    padding: 1.35rem;

    border: 1px solid #dbe3ef;
    border-radius: 24px;

    background:
        radial-gradient(
            circle at top right,
            rgba(91, 95, 168, 0.13),
            transparent 30%
        ),
        radial-gradient(
            circle at bottom left,
            rgba(230, 0, 79, 0.05),
            transparent 28%
        ),
        white;

    color: #0f172a;

    box-shadow: 0 16px 42px rgba(15, 23, 42, 0.08);
}

.logical-shift-widget-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;

    margin-bottom: 1.25rem;
}

.logical-shift-widget-header h3 {
    margin: 0.2rem 0 0;
}

.logical-shift-widget-eyebrow {
    margin: 0;

    color: #5b5fa8;
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.logical-shift-widget-summary-card {
    min-width: 225px;

    display: flex;
    flex-direction: column;
    align-items: center;

    padding: 0.85rem 1rem;

    border: 1px solid #cbd5e1;
    border-radius: 18px;

    background: #f8fafc;
}

.logical-shift-widget-summary-card span {
    color: #64748b;
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
}

.logical-shift-widget-summary-card strong {
    margin: 0.18rem 0;

    color: #5b5fa8;

    font-family: "Courier New", monospace;
    font-size: 1.55rem;
    font-weight: 900;
    letter-spacing: 0.06em;
}

.logical-shift-widget-summary-card small {
    color: #334155;
    font-weight: 800;
    text-align: center;
}

.logical-shift-widget-summary-card.loss-warning {
    border-color: #fed7aa;
    background: #fff7ed;
}

.logical-shift-widget-summary-card.loss-warning strong,
.logical-shift-widget-summary-card.loss-warning small {
    color: #9a3412;
}

/* =========================================================
   Input and controls
   ========================================================= */

.logical-shift-widget-input-card {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;

    margin-bottom: 1rem;
    padding: 1rem;

    border: 1px solid #e2e8f0;
    border-radius: 20px;

    background: #f8fafc;
}

.logical-shift-widget-input-card label,
.logical-shift-widget-answer-area label {
    color: #475569;
    font-size: 0.86rem;
    font-weight: 800;
}

.logical-shift-widget-input-card input,
.logical-shift-widget-answer-area input {
    width: 100%;
    box-sizing: border-box;

    padding: 0.8rem 0.9rem;

    border: 1px solid #cbd5e1;
    border-radius: 14px;

    background: white;
    color: #0f172a;

    font-family: "Courier New", monospace;
    font-size: 1.12rem;
    font-weight: 900;
    letter-spacing: 0.09em;

    outline: none;
}

.logical-shift-widget-input-card input:focus,
.logical-shift-widget-answer-area input:focus {
    border-color: #5b5fa8;

    box-shadow: 0 0 0 4px rgba(91, 95, 168, 0.12);
}

.logical-shift-widget-input-card small {
    color: #475569;
    font-weight: 800;
}

.logical-shift-widget-fieldset {
    margin: 0 0 1rem;
    padding: 1rem;

    border: 1px solid #e2e8f0;
    border-radius: 18px;

    background: rgba(248, 250, 252, 0.82);
}

.logical-shift-widget-fieldset legend {
    padding: 0 0.4rem;

    color: #334155;
    font-weight: 900;
}

.logical-shift-widget-control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.logical-shift-widget-control-grid h4 {
    margin: 0 0 0.5rem;
}

.logical-shift-widget-option-row,
.logical-shift-widget-actions,
.logical-shift-widget-challenge-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.logical-shift-direction-option,
.logical-shift-count-option {
    padding: 0.55rem 0.9rem;

    border: 1px solid #cbd5e1;
    border-radius: 999px;

    background: white;
    color: #334155;

    font-weight: 800;
    cursor: pointer;

    transition: all 0.2s ease;
}

.logical-shift-direction-option:hover,
.logical-shift-count-option:hover {
    border-color: #5b5fa8;
    color: #34387f;

    transform: translateY(-1px);
}

.logical-shift-direction-option.active,
.logical-shift-count-option.active {
    border-color: #5b5fa8;

    background: #5b5fa8;
    color: white;

    box-shadow: 0 8px 18px rgba(91, 95, 168, 0.22);
}

.logical-shift-widget-settings-message {
    margin: 0.8rem 0 0;

    color: #475569;
    font-size: 0.9rem;
    font-weight: 700;
}

.logical-shift-widget-actions {
    margin: 1rem 0;
}

.logical-shift-widget-actions button:disabled {
    opacity: 0.45;
    cursor: default;
    transform: none;
}

/* =========================================================
   Feedback
   ========================================================= */

.logical-shift-widget-feedback {
    margin: 1rem 0;
    padding: 0.8rem 1rem;

    border: 1px solid #bfdbfe;
    border-radius: 16px;

    background: #eff6ff;
    color: #1e3a8a;

    font-weight: 800;
}

.logical-shift-widget-feedback.success {
    border-color: #bbf7d0;
    background: #f0fdf4;
    color: #166534;
}

.logical-shift-widget-feedback.error {
    border-color: #fed7aa;
    background: #fff7ed;
    color: #9a3412;
}

/* =========================================================
   Register visualisation
   ========================================================= */

.logical-shift-widget-register-card {
    padding: 1rem;

    border: 1px solid #e2e8f0;
    border-radius: 20px;

    background: #f8fafc;
}

.logical-shift-widget-register-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;

    margin-bottom: 0.8rem;
}

.logical-shift-widget-register-heading h4 {
    margin: 0;
}

.logical-shift-widget-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;

    color: #475569;
    font-size: 0.76rem;
    font-weight: 800;
}

.logical-shift-widget-legend span {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.logical-shift-widget-legend i {
    display: inline-block;

    width: 15px;
    height: 15px;

    border-radius: 5px;
}

.logical-shift-legend-bit {
    border: 1px solid #cbd5e1;
    background: white;
}

.logical-shift-legend-lost {
    border: 1px solid #fb923c;
    background: #fff7ed;
}

.logical-shift-legend-zero {
    border: 1px solid #a5b4fc;
    background: #eef2ff;
}

.logical-shift-widget-boundary {
    display: grid;
    grid-template-columns: minmax(100px, 0.25fr) minmax(0, 1fr) minmax(100px, 0.25fr);
    align-items: center;
    gap: 0.8rem;
}

.logical-shift-widget-lost-zone,
.logical-shift-widget-zero-zone {
    min-height: 108px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;

    padding: 0.75rem;

    border-radius: 16px;

    text-align: center;
}

.logical-shift-widget-lost-zone {
    border: 1px dashed #fb923c;
    background: #fff7ed;
    color: #9a3412;
}

.logical-shift-widget-zero-zone {
    border: 1px dashed #a5b4fc;
    background: #eef2ff;
    color: #3730a3;
}

.logical-shift-widget-lost-zone span,
.logical-shift-widget-zero-zone span {
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
}

.logical-shift-widget-lost-zone strong,
.logical-shift-widget-zero-zone strong {
    font-family: "Courier New", monospace;
    font-size: 1.2rem;
    overflow-wrap: anywhere;
}

.logical-shift-widget-register-area {
    min-width: 0;
}

.logical-shift-widget-position-labels {
    display: grid;
    grid-template-columns: repeat(8, minmax(34px, 1fr));
    gap: 0.35rem;

    margin-bottom: 0.35rem;
}

.logical-shift-widget-position-labels span {
    color: #64748b;
    font-size: 0.68rem;
    font-weight: 900;
    text-align: center;
}

.logical-shift-widget-register {
    display: grid;
    grid-template-columns: repeat(8, minmax(34px, 1fr));
    gap: 0.35rem;
}

.logical-shift-widget-bit {
    min-height: 50px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    border: 2px solid #cbd5e1;
    border-radius: 13px;

    background: white;
    color: #0f172a;

    font-family: "Courier New", monospace;
    font-size: 1.25rem;
    font-weight: 900;

    transition:
        transform 0.25s ease,
        border-color 0.25s ease,
        background 0.25s ease,
        box-shadow 0.25s ease;
}

.logical-shift-widget-bit.inserted-zero {
    border-color: #818cf8;
    background: #eef2ff;
    color: #3730a3;
}

.logical-shift-widget-bit.bit-focus {
    border-color: #e6004f;

    transform: translateY(-5px) scale(1.05);

    box-shadow:
        0 12px 24px rgba(230, 0, 79, 0.15),
        0 0 0 4px rgba(230, 0, 79, 0.08);
}

.logical-shift-widget-direction-arrow {
    margin: 0.6rem 0;

    color: #5b5fa8;
    font-size: 0.88rem;
    font-weight: 900;
    text-align: center;
}

/* =========================================================
   Data cards
   ========================================================= */

.logical-shift-widget-data-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;

    margin: 1rem 0;
}

.logical-shift-widget-data-card,
.logical-shift-widget-explanation-card {
    padding: 0.9rem;

    border: 1px solid #cbd5e1;
    border-radius: 18px;

    background: #f8fafc;
}

.logical-shift-widget-data-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.logical-shift-widget-data-card span,
.logical-shift-widget-explanation-card span {
    color: #64748b;
    font-size: 0.72rem;
    font-weight: 900;
    text-transform: uppercase;
}

.logical-shift-widget-data-card strong,
.logical-shift-widget-explanation-card strong {
    color: #0f172a;

    font-family: "Courier New", monospace;
    text-align: center;

    overflow-wrap: anywhere;
}

.logical-shift-widget-explanation-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;

    margin-bottom: 1rem;
}

.logical-shift-widget-explanation-card.loss-warning {
    border-color: #fed7aa;
    background: #fff7ed;
}

.logical-shift-widget-explanation-card.loss-warning strong {
    color: #9a3412;
}

/* =========================================================
   Challenge
   ========================================================= */

.logical-shift-widget-challenge {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(250px, 0.8fr);
    gap: 1rem;

    padding: 1rem;

    border: 1px solid #e9d5ff;
    border-radius: 20px;

    background: #faf5ff;
    color: #581c87;
}

.logical-shift-widget-challenge h4 {
    margin: 0.15rem 0 0.45rem;
}

.logical-shift-widget-answer-area {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.logical-shift-widget-challenge-message {
    margin: 0;

    font-size: 0.9rem;
    font-weight: 800;
}

.logical-shift-widget-challenge-message.success {
    color: #166534;
}

.logical-shift-widget-challenge-message.error {
    color: #9a3412;
}

/* =========================================================
   Responsive layout
   ========================================================= */

@media (max-width: 1050px) {
    .logical-shift-process-flow {
        grid-template-columns: 1fr;
    }

    .logical-shift-process-arrow {
        min-height: 24px;
        transform: rotate(90deg);
    }
}

@media (max-width: 900px) {
    .logical-shift-widget-control-grid,
    .logical-shift-widget-challenge {
        grid-template-columns: 1fr;
    }

    .logical-shift-widget-data-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .logical-shift-widget-boundary {
        grid-template-columns: 1fr;
    }

    .logical-shift-widget-lost-zone,
    .logical-shift-widget-zero-zone {
        min-height: auto;
    }
}

@media (max-width: 760px) {
    .logical-shift-widget-header,
    .logical-shift-widget-register-heading {
        flex-direction: column;
    }

    .logical-shift-widget-summary-card {
        width: 100%;
        box-sizing: border-box;
    }

    .logical-shift-static-row {
        grid-template-columns: 1fr;
    }

    .logical-shift-static-label {
        text-align: center;
    }
}

@media (max-width: 520px) {
    .logical-shift-widget-position-labels,
    .logical-shift-widget-register {
        gap: 0.2rem;
        grid-template-columns: repeat(8, minmax(27px, 1fr));
    }

    .logical-shift-widget-bit {
        min-height: 42px;
        border-radius: 9px;
        font-size: 1rem;
    }

    .logical-shift-widget-position-labels span {
        font-size: 0.58rem;
    }
}

@media (max-width: 430px) {
    .logical-shift-widget-data-grid {
        grid-template-columns: 1fr;
    }
}