/* =========================================================
   Two's Complement Laboratory
   Secondary Computer Science 1.3.3
   ========================================================= */

.twos-complement-binary-line,
.twos-complement-calculation {
    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;
}

.twos-complement-addition-block {
    width: fit-content;
    max-width: 100%;
    margin: 1rem auto;
    padding: 1rem 1.25rem;
    border: 1px solid #334155;
    border-radius: 18px;
    background: #0f172a;
    color: #f8fafc;
    overflow-x: auto;
}

.twos-complement-addition-block code {
    font-family: "Courier New", monospace;
    font-size: 1.15rem;
    line-height: 1.45;
}

.twos-complement-range-display {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin: 1.5rem 0;
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    background: #f8fafc;
    overflow-x: auto;
}

.twos-complement-range-line {
    min-width: 38px;
    height: 4px;
    flex: 1;
    border-radius: 999px;
    background: #cbd5e1;
}

.twos-complement-range-point {
    min-width: 96px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    padding: 0.7rem;
    border: 1px solid #cbd5e1;
    border-radius: 15px;
    background: white;
}

.twos-complement-range-point strong {
    font-family: "Courier New", monospace;
    font-size: 0.88rem;
}

.twos-complement-range-point span {
    font-weight: 900;
}

.twos-complement-range-point.negative-end {
    border-color: #fca5a5;
    background: #fef2f2;
    color: #991b1b;
}

.twos-complement-range-point.positive-end {
    border-color: #86efac;
    background: #f0fdf4;
    color: #166534;
}

.twos-complement-range-point.zero-point {
    border-color: #a5b4fc;
    background: #eef2ff;
    color: #3730a3;
}

.twos-complement-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;
}

.twos-complement-process-step {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    padding: 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
    color: #334155;
}

.twos-complement-process-step p {
    margin: 0;
    font-size: 0.9rem;
}

.twos-complement-process-number {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: #5b5fa8;
    color: white;
    font-weight: 900;
}

.twos-complement-process-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #5b5fa8;
    font-size: 1.4rem;
    font-weight: 900;
}

/* Main widget */

.twos-complement-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);
}

.twos-complement-widget-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.twos-complement-widget-header h3 {
    margin: 0.2rem 0 0;
}

.twos-complement-widget-eyebrow {
    margin: 0;
    color: #5b5fa8;
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.twos-complement-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;
}

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

.twos-complement-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;
}

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

.twos-complement-widget-summary-card.negative-value {
    border-color: #fed7aa;
    background: #fff7ed;
}

.twos-complement-widget-summary-card.negative-value strong,
.twos-complement-widget-summary-card.negative-value small {
    color: #9a3412;
}

/* Modes and inputs */

.twos-complement-widget-fieldset {
    margin: 0 0 1rem;
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.82);
}

.twos-complement-widget-fieldset legend {
    padding: 0 0.4rem;
    color: #334155;
    font-weight: 900;
}

.twos-complement-widget-mode-options,
.twos-complement-widget-actions,
.twos-complement-widget-challenge-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.twos-complement-mode-option {
    padding: 0.6rem 0.95rem;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    background: white;
    color: #334155;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s ease;
}

.twos-complement-mode-option:hover {
    border-color: #5b5fa8;
    color: #34387f;
    transform: translateY(-1px);
}

.twos-complement-mode-option.active {
    border-color: #5b5fa8;
    background: #5b5fa8;
    color: white;
    box-shadow: 0 8px 18px rgba(91, 95, 168, 0.22);
}

.twos-complement-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;
}

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

.twos-complement-widget-input-card input,
.twos-complement-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: 0.07em;
    outline: none;
}

.twos-complement-widget-input-card input:focus,
.twos-complement-widget-answer-area input:focus {
    border-color: #5b5fa8;
    box-shadow: 0 0 0 4px rgba(91, 95, 168, 0.12);
}

.twos-complement-widget-input-card small {
    color: #475569;
    font-weight: 700;
}

.twos-complement-widget-actions {
    margin: 1rem 0;
}

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

/* Feedback */

.twos-complement-widget-feedback {
    margin: 1rem 0;
    padding: 0.8rem 1rem;
    border: 1px solid #bfdbfe;
    border-radius: 16px;
    background: #eff6ff;
    color: #1e3a8a;
    font-weight: 800;
}

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

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

/* Conversion stages */

.twos-complement-widget-process {
    display: grid;
    grid-template-columns:
        minmax(145px, 1fr) auto
        minmax(145px, 1fr) auto
        minmax(145px, 1fr) auto
        minmax(145px, 1fr);
    align-items: stretch;
    gap: 0.55rem;
    margin: 1rem 0;
}

.twos-complement-widget-process-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    padding: 0.9rem;
    border: 1px solid #cbd5e1;
    border-radius: 17px;
    background: #f8fafc;
    text-align: center;
    transition:
        transform 0.22s ease,
        border-color 0.22s ease,
        box-shadow 0.22s ease,
        background 0.22s ease;
}

.twos-complement-widget-process-card span {
    color: #64748b;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
}

.twos-complement-widget-process-card strong {
    color: #334155;
    font-size: 0.86rem;
}

.twos-complement-widget-process-card code {
    color: #0f172a;
    font-family: "Courier New", monospace;
    font-size: 1rem;
    font-weight: 900;
    overflow-wrap: anywhere;
}

.twos-complement-widget-process-card.final-card {
    border-color: #a5b4fc;
    background: #eef2ff;
}

.twos-complement-widget-process-card.active {
    border-color: #e6004f;
    background: #fff1f5;
    transform: translateY(-5px);
    box-shadow:
        0 12px 24px rgba(230, 0, 79, 0.15),
        0 0 0 4px rgba(230, 0, 79, 0.08);
}

.twos-complement-widget-process-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #5b5fa8;
    font-weight: 900;
}

/* Registers */

.twos-complement-widget-register-card {
    margin: 1rem 0;
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    background: #f8fafc;
}

.twos-complement-widget-register-card h4 {
    margin-top: 0;
}

.twos-complement-widget-register-row {
    display: grid;
    grid-template-columns: 95px minmax(0, 1fr);
    align-items: center;
    gap: 0.75rem;
    margin: 0.65rem 0;
}

.twos-complement-widget-register-row > span {
    color: #475569;
    font-size: 0.78rem;
    font-weight: 900;
    text-align: right;
    text-transform: uppercase;
}

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

.twos-complement-widget-bit {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #cbd5e1;
    border-radius: 12px;
    background: white;
    color: #0f172a;
    font-family: "Courier New", monospace;
    font-size: 1.2rem;
    font-weight: 900;
    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        background 0.2s ease;
}

.inverted-register .twos-complement-widget-bit {
    border-color: #fdba74;
    background: #fff7ed;
    color: #9a3412;
}

.final-register .twos-complement-widget-bit {
    border-color: #a5b4fc;
    background: #eef2ff;
    color: #3730a3;
}

.twos-complement-widget-bit.sign-bit {
    border-color: #e6004f;
    box-shadow: 0 0 0 3px rgba(230, 0, 79, 0.08);
}

/* Readouts */

.twos-complement-widget-data-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 1rem 0;
}

.twos-complement-widget-data-card,
.twos-complement-widget-explanation-card {
    padding: 0.9rem;
    border: 1px solid #cbd5e1;
    border-radius: 18px;
    background: #f8fafc;
}

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

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

.twos-complement-widget-data-card strong,
.twos-complement-widget-explanation-card strong {
    color: #0f172a;
    font-family: "Courier New", monospace;
    text-align: center;
    overflow-wrap: anywhere;
}

.twos-complement-widget-explanation-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1rem;
}

.twos-complement-widget-explanation-card.negative-value {
    border-color: #fed7aa;
    background: #fff7ed;
}

.twos-complement-widget-explanation-card.negative-value strong {
    color: #9a3412;
}

/* Challenge */

.twos-complement-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;
}

.twos-complement-widget-challenge h4 {
    margin: 0.15rem 0 0.45rem;
}

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

.twos-complement-widget-challenge-message {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 800;
}

.twos-complement-widget-challenge-message.success {
    color: #166534;
}

.twos-complement-widget-challenge-message.error {
    color: #9a3412;
}

/* Responsive */

@media (max-width: 1050px) {
    .twos-complement-process-flow,
    .twos-complement-widget-process {
        grid-template-columns: 1fr;
    }

    .twos-complement-process-arrow,
    .twos-complement-widget-process-arrow {
        min-height: 22px;
        transform: rotate(90deg);
    }
}

@media (max-width: 900px) {
    .twos-complement-widget-data-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .twos-complement-widget-challenge {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .twos-complement-widget-header {
        flex-direction: column;
    }

    .twos-complement-widget-summary-card {
        width: 100%;
        box-sizing: border-box;
    }

    .twos-complement-range-display {
        align-items: stretch;
    }

    .twos-complement-widget-register-row {
        grid-template-columns: 1fr;
    }

    .twos-complement-widget-register-row > span {
        text-align: left;
    }
}

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

    .twos-complement-widget-bit {
        min-height: 40px;
        border-radius: 8px;
        font-size: 1rem;
    }
}

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