/* =========================================================
   Compression Choice and RLE Laboratory
   Secondary Computer Science 1.4.3
   ========================================================= */

/* ---------------------------------------------------------
   Static lesson elements
   --------------------------------------------------------- */

.compression-rle-formula,
.compression-sequence-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: 1.15rem;
    font-weight: 900;
    text-align: center;

    overflow-wrap: anywhere;
}

.compression-rle-formula {
    border-color: #c7d2fe;
    background: #eef2ff;
    color: #3730a3;
}

.compression-purpose-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;
}

.compression-purpose-flow-step {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;

    padding: 1rem;

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

    background: #f8fafc;
    color: #334155;
}

.compression-purpose-flow-step p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
}

.compression-purpose-flow-number {
    width: 30px;
    height: 30px;

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

    border-radius: 999px;

    background: #5b5fa8;
    color: white;

    font-weight: 900;
}

.compression-purpose-flow-arrow,
.compression-decision-arrow {
    display: flex;
    align-items: center;
    justify-content: center;

    color: #5b5fa8;
    font-size: 1.4rem;
    font-weight: 900;
}

.compression-decision-flow {
    display: grid;
    grid-template-columns:
        minmax(190px, 1fr)
        auto
        minmax(190px, 1fr)
        auto
        minmax(190px, 1fr);

    align-items: stretch;
    gap: 0.75rem;

    margin: 1.5rem 0;
}

.compression-decision-card {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;

    padding: 1rem;

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

    background: #f8fafc;
}

.compression-decision-card span {
    color: #5b5fa8;
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.compression-decision-card p {
    margin: 0;
    color: #475569;
}

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

.compression-purpose-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);
}

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

    margin-bottom: 1.25rem;
}

.compression-purpose-widget-header h3 {
    margin: 0.2rem 0 0;
}

.compression-purpose-widget-eyebrow {
    margin: 0;

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

.compression-purpose-widget-summary-card {
    min-width: 245px;

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

    padding: 0.85rem 1rem;

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

    background: #f8fafc;
}

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

.compression-purpose-widget-summary-card strong {
    margin: 0.18rem 0;

    color: #5b5fa8;

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

    overflow-wrap: anywhere;
}

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

.compression-purpose-widget-summary-card.is-beneficial {
    border-color: #86efac;
    background: #f0fdf4;
}

.compression-purpose-widget-summary-card.is-beneficial strong,
.compression-purpose-widget-summary-card.is-beneficial small {
    color: #166534;
}

.compression-purpose-widget-summary-card.is-expansion {
    border-color: #fdba74;
    background: #fff7ed;
}

.compression-purpose-widget-summary-card.is-expansion strong,
.compression-purpose-widget-summary-card.is-expansion small {
    color: #9a3412;
}

/* ---------------------------------------------------------
   Input and actions
   --------------------------------------------------------- */

.compression-purpose-widget-input-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;

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

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

    background: #f8fafc;
}

.compression-purpose-widget-input-card label {
    color: #475569;
    font-size: 0.84rem;
    font-weight: 800;
}

.compression-purpose-widget-input-card input {
    width: 100%;
    box-sizing: border-box;

    padding: 0.76rem 0.85rem;

    border: 1px solid #cbd5e1;
    border-radius: 13px;

    background: white;
    color: #0f172a;

    font-family: "Courier New", monospace;
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: 0.04em;

    outline: none;
}

.compression-purpose-widget-input-card input:focus {
    border-color: #5b5fa8;

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

.compression-purpose-widget-input-card small {
    color: #64748b;
    font-size: 0.78rem;
    font-weight: 700;
}

.compression-purpose-widget-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;

    margin: 1rem 0;
}

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

/* ---------------------------------------------------------
   Feedback
   --------------------------------------------------------- */

.compression-purpose-widget-feedback {
    margin: 1rem 0;
    padding: 0.8rem 1rem;

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

    background: #eff6ff;
    color: #1e3a8a;

    font-weight: 800;
}

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

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

/* ---------------------------------------------------------
   Sequence strips
   --------------------------------------------------------- */

.compression-purpose-widget-strip-card {
    padding: 1rem;

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

    background: #f8fafc;
}

.compression-purpose-widget-strip-heading {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;

    margin-bottom: 1rem;
}

.compression-purpose-widget-strip-heading > div {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;

    padding: 0.75rem;

    border: 1px solid #cbd5e1;
    border-radius: 15px;

    background: white;
}

.compression-purpose-widget-strip-heading span {
    color: #64748b;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
}

.compression-purpose-widget-strip-heading strong {
    color: #0f172a;
    font-family: "Courier New", monospace;
}

.compression-purpose-widget-strip-section h4 {
    margin: 0.6rem 0;
}

.compression-purpose-widget-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;

    min-height: 58px;

    align-items: center;

    padding: 0.7rem;

    border: 1px solid #cbd5e1;
    border-radius: 16px;

    background: white;
}

.compression-purpose-widget-symbol,
.compression-purpose-widget-token {
    min-width: 39px;
    min-height: 39px;

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

    border: 2px solid #cbd5e1;
    border-radius: 11px;

    background: white;
    color: #0f172a;

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

    transition:
        transform 0.2s ease,
        border-color 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease;
}

.compression-purpose-widget-token {
    min-width: 52px;

    border-color: #c4b5fd;
    background: #f5f3ff;
    color: #5b21b6;
}

.compression-purpose-widget-symbol.is-active,
.compression-purpose-widget-token.is-active {
    border-color: #e6004f;
    background: #fff1f5;
    color: #9f1239;

    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);
}

.compression-purpose-widget-symbol.is-complete,
.compression-purpose-widget-token.is-complete {
    border-color: #86efac;
    background: #f0fdf4;
    color: #166534;
}

.compression-purpose-widget-strip-arrow {
    margin: 0.75rem 0;

    color: #5b5fa8;
    font-size: 0.8rem;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
}

/* ---------------------------------------------------------
   Process list
   --------------------------------------------------------- */

.compression-purpose-widget-process-card {
    margin: 1rem 0;
    padding: 1rem;

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

    background: #f8fafc;
}

.compression-purpose-widget-process-card h4 {
    margin-top: 0;
}

.compression-purpose-widget-process-list {
    margin-bottom: 0;
    padding-left: 1.5rem;
}

.compression-purpose-widget-process-list li {
    margin: 0.45rem 0;
    padding: 0.4rem 0.55rem;

    border-radius: 10px;

    color: #475569;

    transition:
        background 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
}

.compression-purpose-widget-process-list li.active {
    background: #fff1f5;
    color: #9f1239;
    font-weight: 900;

    transform: translateX(5px);
}

.compression-purpose-widget-process-list li.completed {
    background: #f0fdf4;
    color: #166534;
}

/* ---------------------------------------------------------
   Data cards and explanation
   --------------------------------------------------------- */

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

    margin: 1rem 0;
}

.compression-purpose-widget-data-card,
.compression-purpose-widget-explanation-card {
    padding: 0.9rem;

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

    background: #f8fafc;
}

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

.compression-purpose-widget-data-card span,
.compression-purpose-widget-explanation-card span {
    color: #64748b;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
}

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

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

    margin-bottom: 1rem;
}

.compression-purpose-widget-explanation-card.is-beneficial {
    border-color: #86efac;
    background: #f0fdf4;
}

.compression-purpose-widget-explanation-card.is-expansion {
    border-color: #fdba74;
    background: #fff7ed;
}

/* ---------------------------------------------------------
   Decision challenge
   --------------------------------------------------------- */

.compression-purpose-widget-challenge {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
    gap: 1rem;

    padding: 1rem;

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

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

.compression-purpose-widget-challenge h4 {
    margin: 0.15rem 0 0.45rem;
}

.compression-purpose-widget-choice-area {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.compression-method-option {
    padding: 0.65rem 0.9rem;

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

    background: white;
    color: #334155;

    font-weight: 900;
    cursor: pointer;

    transition: all 0.2s ease;
}

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

.compression-method-option.correct-choice {
    border-color: #22c55e;
    background: #f0fdf4;
    color: #166534;
}

.compression-method-option.incorrect-choice {
    border-color: #fb923c;
    background: #fff7ed;
    color: #9a3412;
}

.compression-purpose-widget-challenge-message {
    margin: 0;

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

.compression-purpose-widget-challenge-message.success {
    color: #166534;
}

.compression-purpose-widget-challenge-message.error {
    color: #9a3412;
}

/* ---------------------------------------------------------
   Responsive layout
   --------------------------------------------------------- */

@media (max-width: 1050px) {
    .compression-purpose-flow,
    .compression-decision-flow {
        grid-template-columns: 1fr;
    }

    .compression-purpose-flow-arrow,
    .compression-decision-arrow {
        min-height: 24px;
        transform: rotate(90deg);
    }
}

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

    .compression-purpose-widget-challenge {
        grid-template-columns: 1fr;
    }
}

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

    .compression-purpose-widget-summary-card {
        width: 100%;
        box-sizing: border-box;
    }

    .compression-purpose-widget-strip-heading {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .compression-purpose-widget-data-grid {
        grid-template-columns: 1fr;
    }

    .compression-purpose-widget-symbol {
        min-width: 34px;
        min-height: 34px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .compression-purpose-widget-symbol,
    .compression-purpose-widget-token,
    .compression-method-option,
    .compression-purpose-widget-process-list li {
        transition: none;
    }
}