/* ==========================================================================
   Quiz Widget — interactive quiz rendered inside chat messages
   All selectors are scoped to .quiz-widget to prevent conflicts.

   Theme approach: CSS variables defined in :root (light) and overridden in
   body.dark-theme — selectors only use var() references, no duplication.
   ========================================================================== */

/* ---------------------------------------------------------------------------
   Design tokens — light theme
   ------------------------------------------------------------------------- */
:root {
    --quiz-bg:                    #fafaf8;
    --quiz-surface:               #f2f0eb;
    --quiz-border:                #d6d2cb;
    --quiz-shadow:                rgba(0, 0, 0, 0.1);

    --quiz-text-primary:          #2d2d2d;
    --quiz-text-secondary:        #6b6870;
    --quiz-text-hint:             #9e9b97;

    --quiz-option-bg:             #ffffff;
    --quiz-option-border:         #d6d2cb;
    --quiz-option-hover-bg:       rgba(64, 80, 98, 0.05);
    --quiz-option-hover-border:   #a0a8b0;
    --quiz-option-selected-bg:    rgba(64, 80, 98, 0.07);
    --quiz-option-selected-border:#405062;
    --quiz-input-accent:          #405062;

    --quiz-accent:                #405062;
    --quiz-accent-hover:          #334050;
    --quiz-accent-text:           #ffffff;

    --quiz-nav-btn-bg:            transparent;
    --quiz-nav-btn-border:        #d6d2cb;
    --quiz-nav-btn-color:         #405062;
    --quiz-nav-btn-hover-bg:      rgba(64, 80, 98, 0.06);
    --quiz-nav-btn-hover-border:  #405062;

    --quiz-progress-track:        #d6d2cb;

    --quiz-correct-bg:            rgba(47, 133, 90, 0.07);
    --quiz-correct-border:        #38a169;
    --quiz-correct-text:          #276749;
    --quiz-correct-badge-bg:      rgba(47, 133, 90, 0.12);

    --quiz-wrong-bg:              rgba(197, 48, 48, 0.06);
    --quiz-wrong-border:          #c53030;
    --quiz-wrong-text:            #9b2c2c;
    --quiz-wrong-badge-bg:        rgba(197, 48, 48, 0.10);

    --quiz-missed-bg:             rgba(47, 133, 90, 0.04);

    --quiz-error-color:           #c53030;
    --quiz-error-bg:              rgba(197, 48, 48, 0.06);
    --quiz-error-border:          rgba(197, 48, 48, 0.18);
}

/* ---------------------------------------------------------------------------
   Design tokens — dark theme overrides
   ------------------------------------------------------------------------- */
body.dark-theme {
    --quiz-bg:                    #252528;
    --quiz-surface:               #2a2a2a;
    --quiz-border:                #3a3a3a;
    --quiz-shadow:                rgba(0, 0, 0, 0.28);

    --quiz-text-primary:          #f0f0f0;
    --quiz-text-secondary:        #a0a0a0;
    --quiz-text-hint:             #686868;

    --quiz-option-bg:             transparent;
    --quiz-option-border:         #444444;
    --quiz-option-hover-bg:       rgba(113, 164, 223, 0.10);
    --quiz-option-hover-border:   rgba(113, 164, 223, 0.50);
    --quiz-option-selected-bg:    rgba(113, 164, 223, 0.13);
    --quiz-option-selected-border:#71a4df;
    --quiz-input-accent:          #71a4df;

    --quiz-accent:                #4a7fb5;
    --quiz-accent-hover:          #5a8fc5;
    --quiz-accent-text:           #ffffff;

    --quiz-nav-btn-bg:            transparent;
    --quiz-nav-btn-border:        #444444;
    --quiz-nav-btn-color:         #d0d0d0;
    --quiz-nav-btn-hover-bg:      rgba(113, 164, 223, 0.10);
    --quiz-nav-btn-hover-border:  #71a4df;

    --quiz-progress-track:        #3a3a3a;

    --quiz-correct-bg:            rgba(56, 161, 105, 0.14);
    --quiz-correct-border:        #38a169;
    --quiz-correct-text:          #68d391;
    --quiz-correct-badge-bg:      rgba(56, 161, 105, 0.22);

    --quiz-wrong-bg:              rgba(229, 62, 62, 0.12);
    --quiz-wrong-border:          #e53e3e;
    --quiz-wrong-text:            #fc8181;
    --quiz-wrong-badge-bg:        rgba(229, 62, 62, 0.22);

    --quiz-missed-bg:             rgba(56, 161, 105, 0.06);

    --quiz-error-color:           #fc8181;
    --quiz-error-bg:              rgba(229, 62, 62, 0.12);
    --quiz-error-border:          rgba(229, 62, 62, 0.28);
}

/* ---------------------------------------------------------------------------
   Container
   ------------------------------------------------------------------------- */
.quiz-widget {
    background: var(--quiz-bg);
    border: 1px solid var(--quiz-border);
    border-radius: 12px;
    overflow: hidden;
    margin-top: 10px;
    max-width: 48rem;
    margin-left: 36px;
    width: 89%;
    box-shadow: 0 2px 4px var(--quiz-shadow);
    font-family: inherit;
}

/* ---------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-header {
    padding: 13px 18px 11px;
    border-bottom: 1px solid var(--quiz-border);
    background: var(--quiz-surface);
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.quiz-widget .quiz-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--quiz-text-primary);
    margin: 0;
    line-height: 1.35;
    flex: 1;
    min-width: 0;
}

.quiz-widget .quiz-meta {
    font-size: 11.5px;
    color: var(--quiz-text-secondary);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ---------------------------------------------------------------------------
   Questions (single-question navigation mode)
   .quiz-widget--nav hides all but the active question.
   Nav class is removed after submit so all questions expand for review.
   ------------------------------------------------------------------------- */
.quiz-widget.quiz-widget--nav .quiz-question {
    display: none;
}

.quiz-widget.quiz-widget--nav .quiz-question.quiz-question--active {
    display: block;
}

.quiz-widget .quiz-questions {
    padding: 4px 0;
}

.quiz-widget .quiz-question {
    padding: 14px 18px;
    border-bottom: 1px solid var(--quiz-border);
    transition: background 0.15s ease;
}

.quiz-widget .quiz-question:last-child {
    border-bottom: none;
}

.quiz-widget .quiz-question-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--quiz-text-primary);
    margin: 0 0 11px;
    line-height: 1.5;
}

.quiz-widget .quiz-question-hint {
    font-size: 11px;
    color: var(--quiz-text-hint);
    margin-bottom: 9px;
    font-style: italic;
}

/* ---------------------------------------------------------------------------
   Options (radio + checkbox)
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-options {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.quiz-widget .quiz-option {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 12px;
    background: var(--quiz-option-bg);
    border: 1.5px solid var(--quiz-option-border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
    user-select: none;
}

.quiz-widget .quiz-option:hover:not(.quiz-option--disabled) {
    background: var(--quiz-option-hover-bg);
    border-color: var(--quiz-option-hover-border);
}

.quiz-widget .quiz-option input[type="radio"],
.quiz-widget .quiz-option input[type="checkbox"] {
    margin-top: 2px;
    flex-shrink: 0;
    accent-color: var(--quiz-input-accent);
    cursor: pointer;
    width: 15px;
    height: 15px;
}

.quiz-widget .quiz-option--selected {
    border-color: var(--quiz-option-selected-border);
    background: var(--quiz-option-selected-bg);
}

.quiz-widget .quiz-option--disabled {
    cursor: default;
    opacity: 0.85;
}

.quiz-widget .quiz-option--disabled input {
    cursor: default;
}

.quiz-widget .quiz-option-label {
    font-size: 13.5px;
    color: var(--quiz-text-primary);
    line-height: 1.45;
    flex: 1;
}

/* Result state decorators */
.quiz-widget .quiz-option--correct {
    border-color: var(--quiz-correct-border) !important;
    background: var(--quiz-correct-bg) !important;
}

.quiz-widget .quiz-option--wrong {
    border-color: var(--quiz-wrong-border) !important;
    background: var(--quiz-wrong-bg) !important;
}

.quiz-widget .quiz-option--missed {
    border-color: var(--quiz-correct-border) !important;
    background: var(--quiz-missed-bg) !important;
    opacity: 0.75;
}

.quiz-widget .quiz-option-indicator {
    margin-left: auto;
    flex-shrink: 0;
    font-size: 14px;
    display: none;
}

.quiz-widget .quiz-option--correct  .quiz-option-indicator,
.quiz-widget .quiz-option--wrong    .quiz-option-indicator,
.quiz-widget .quiz-option--missed   .quiz-option-indicator {
    display: inline;
}

/* ---------------------------------------------------------------------------
   Per-question result badge
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-question-result {
    display: none;
    margin-top: 9px;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    width: fit-content;
}

.quiz-widget .quiz-question-result--correct {
    display: inline-block;
    color: var(--quiz-correct-text);
    background: var(--quiz-correct-badge-bg);
}

.quiz-widget .quiz-question-result--wrong {
    display: inline-block;
    color: var(--quiz-wrong-text);
    background: var(--quiz-wrong-badge-bg);
}

/* Shake animation for wrong answers */
@keyframes quiz-shake {
    0%, 100% { transform: translateX(0); }
    20%       { transform: translateX(-5px); }
    40%       { transform: translateX(5px); }
    60%       { transform: translateX(-4px); }
    80%       { transform: translateX(4px); }
}

.quiz-widget .quiz-question--shake {
    animation: quiz-shake 0.4s ease;
}

/* ---------------------------------------------------------------------------
   Footer — Prev / step indicator / Next or Submit
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-footer {
    padding: 10px 18px 11px;
    border-top: 1px solid var(--quiz-border);
    background: var(--quiz-surface);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Navigation buttons (Prev / Next) */
.quiz-widget .quiz-nav-btn {
    padding: 6px 14px;
    background: var(--quiz-nav-btn-bg);
    color: var(--quiz-nav-btn-color);
    border: 1.5px solid var(--quiz-nav-btn-border);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease, opacity 0.15s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.quiz-widget .quiz-nav-btn:hover:not(:disabled) {
    background: var(--quiz-nav-btn-hover-bg);
    border-color: var(--quiz-nav-btn-hover-border);
}

.quiz-widget .quiz-nav-btn:disabled {
    opacity: 0.30;
    cursor: not-allowed;
}

/* Step label centred between the two navigation buttons */
.quiz-widget .quiz-step-indicator {
    flex: 1;
    text-align: center;
    font-size: 12px;
    color: var(--quiz-text-secondary);
    white-space: nowrap;
}

/* Submit button */
.quiz-widget .quiz-submit-btn {
    padding: 6px 18px;
    background: var(--quiz-accent);
    color: var(--quiz-accent-text);
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease, opacity 0.15s ease, transform 0.1s ease;
    letter-spacing: 0.01em;
    flex-shrink: 0;
}

.quiz-widget .quiz-submit-btn:hover:not(:disabled) {
    background: var(--quiz-accent-hover);
    transform: translateY(-1px);
}

.quiz-widget .quiz-submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.quiz-widget .quiz-submit-btn:disabled {
    opacity: 0.40;
    cursor: not-allowed;
    transform: none;
}

/* ---------------------------------------------------------------------------
   Summary — stat cards + expandable detail panel (shown after submission)
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-summary {
    padding: 14px 18px 16px;
    border-top: 1px solid var(--quiz-border);
    background: var(--quiz-surface);
    display: none;
}

.quiz-widget .quiz-summary--visible {
    display: block;
}

/* 4-column grid for the stat cards */
.quiz-widget .quiz-summary-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 9px;
}

/* Individual stat card */
.quiz-widget .quiz-stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 20px 10px 18px;
    background: var(--quiz-option-bg);
    border: 1.5px solid var(--quiz-option-border);
    border-radius: 10px;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
    font-family: inherit;
}

.quiz-widget .quiz-stat-card:hover {
    background: var(--quiz-option-hover-bg);
    border-color: var(--quiz-option-hover-border);
    transform: translateY(-1px);
}

.quiz-widget .quiz-stat-card--active {
    border-color: var(--quiz-option-selected-border) !important;
    background: var(--quiz-option-selected-bg) !important;
}

.quiz-widget .quiz-stat-card--correct:hover,
.quiz-widget .quiz-stat-card--correct.quiz-stat-card--active {
    border-color: var(--quiz-correct-border) !important;
    background: var(--quiz-correct-bg) !important;
}

.quiz-widget .quiz-stat-card--wrong:hover,
.quiz-widget .quiz-stat-card--wrong.quiz-stat-card--active {
    border-color: var(--quiz-wrong-border) !important;
    background: var(--quiz-wrong-bg) !important;
}

.quiz-widget .quiz-stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--quiz-text-primary);
    line-height: 1.1;
}

.quiz-widget .quiz-stat-card--correct .quiz-stat-value {
    color: var(--quiz-correct-text);
}

.quiz-widget .quiz-stat-card--wrong .quiz-stat-value {
    color: var(--quiz-wrong-text);
}

.quiz-widget .quiz-stat-card--score-good .quiz-stat-value { color: var(--quiz-correct-text); }
.quiz-widget .quiz-stat-card--score-ok  .quiz-stat-value { color: #b7791f; }
.quiz-widget .quiz-stat-card--score-low .quiz-stat-value { color: var(--quiz-wrong-text); }

body.dark-theme .quiz-widget .quiz-stat-card--score-ok .quiz-stat-value { color: #ecc94b; }

.quiz-widget .quiz-stat-label {
    font-size: 10.5px;
    font-weight: 600;
    color: var(--quiz-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Detail panel */
.quiz-widget .quiz-summary-detail {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--quiz-border);
}

.quiz-widget .quiz-summary-detail[hidden] {
    display: none;
}

.quiz-widget .quiz-summary-detail-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.quiz-widget .quiz-summary-detail-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--quiz-text-primary);
}

.quiz-widget .quiz-summary-detail-close {
    padding: 3px 9px;
    background: transparent;
    border: 1px solid var(--quiz-border);
    border-radius: 6px;
    color: var(--quiz-text-secondary);
    font-size: 11px;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s ease, color 0.15s ease;
}

.quiz-widget .quiz-summary-detail-close:hover {
    background: var(--quiz-option-hover-bg);
    color: var(--quiz-text-primary);
}

.quiz-widget .quiz-summary-detail-questions {
    /* Questions already have their own padding/border styles */
}

.quiz-widget .quiz-detail-empty {
    text-align: center;
    color: var(--quiz-text-secondary);
    font-size: 13px;
    padding: 18px 0 6px;
    font-style: italic;
    margin: 0;
}

/* ---------------------------------------------------------------------------
   Loading / error states
   ------------------------------------------------------------------------- */
.quiz-widget .quiz-loading {
    padding: 20px 18px;
    text-align: center;
    color: var(--quiz-text-secondary);
    font-size: 13px;
}

.quiz-widget .quiz-error {
    padding: 12px 18px;
    color: var(--quiz-error-color);
    font-size: 13px;
    background: var(--quiz-error-bg);
    border-top: 1px solid var(--quiz-error-border);
}

/* ---------------------------------------------------------------------------
   Responsive — narrow widget containers (embeddable widget)
   ------------------------------------------------------------------------- */
@media (max-width: 460px) {
    .quiz-widget {
        border-radius: 8px;
    }

    .quiz-widget .quiz-question,
    .quiz-widget .quiz-footer,
    .quiz-widget .quiz-header,
    .quiz-widget .quiz-summary {
        padding-left: 14px;
        padding-right: 14px;
    }

    .quiz-widget .quiz-summary-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .quiz-widget .quiz-nav-btn {
        padding: 6px 10px;
        font-size: 12px;
    }

    .quiz-widget .quiz-submit-btn {
        padding: 6px 13px;
        font-size: 12.5px;
    }
}