/* ==========================================================================
   AIRA EXERCISE & PRACTICE COMPONENT SYSTEM
   ========================================================================== */

/* Main Practice/Exercise Layout */
.exercise-container {
    max-width: 80vw;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.exercise-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-2xl);
    padding: clamp(var(--spacing-lg), var(--spacing-xl) + 1vh, var(--spacing-2xl));
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* MCQ Options Grid */
.mcq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

@media (min-width: 600px) {
    .mcq-grid.two-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* MCQ Option Element */
.mcq-option {
    border: 1px solid var(--border);
    background: var(--surface-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    transition: transform var(--duration-fast) var(--ease-out),
                border-color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
    position: relative;
    outline: none;
}

@media (hover: hover) and (pointer: fine) {
    .mcq-option:hover {
        border-color: var(--primary);
        background: var(--surface-hover);
        transform: translateY(-1px);
    }
}

.mcq-option:active {
    transform: scale(0.98);
}

.mcq-option.selected {
    border-color: var(--primary);
    background-color: var(--surface-hover);
    box-shadow: 0 0 0 2px var(--border-focus);
}

.mcq-option.correct {
    border-color: var(--success);
    background-color: rgba(61, 107, 80, 0.08);
}

.mcq-option.incorrect {
    border-color: var(--error);
    background-color: rgba(192, 57, 43, 0.08);
}

/* Fill-in-the-blank text inputs */
.blank-input {
    border: none;
    border-bottom: 2px solid var(--border);
    background: transparent;
    padding: 0.125rem 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    color: var(--primary);
    outline: none;
    transition: border-color var(--duration-fast) var(--ease-out);
}

.blank-input:focus {
    border-bottom-color: var(--border-focus);
}

/* Feedback panels */
.feedback-panel {
    border-radius: var(--radius-xl);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: opacity var(--duration-medium) var(--ease-out), transform var(--duration-medium) var(--ease-out);
}

.feedback-panel.success {
    background-color: rgba(61, 107, 80, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.feedback-panel.error {
    background-color: rgba(192, 57, 43, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

/* Small web approximation of Liquid Glass for the practice speedrunner switch. */
.speedrunner-setting {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    width: 100%;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
    text-align: left;
}

.speedrunner-copy { display: grid; gap: var(--spacing-xs); min-width: 0; }
.speedrunner-title { color: var(--text-primary); font-size: 0.9rem; font-weight: 700; }
.speedrunner-description { color: var(--text-secondary); font-size: 0.8rem; line-height: 1.4; }
.speedrunner-control { position: relative; display: inline-flex; flex: 0 0 44px; width: 44px; height: 26px; cursor: pointer; }
.speedrunner-input { position: absolute; z-index: 1; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }

.speedrunner-track {
    position: relative;
    display: block;
    width: 44px;
    height: 26px;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0.12)), var(--surface-light);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.82), inset 0 -1px 0 rgba(62, 50, 40, 0.06), var(--shadow-sm);
    backdrop-filter: blur(14px) saturate(165%) contrast(1.04);
    -webkit-backdrop-filter: blur(14px) saturate(165%) contrast(1.04);
    transition: background-color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.speedrunner-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    z-index: 1;
    width: 18px;
    height: 18px;
    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-pill);
    background: #fff;
    box-shadow: 0 1px 4px rgba(25, 20, 16, 0.24), inset 0 1px 0 rgba(255, 255, 255, 0.9);
    transition: transform var(--duration-fast) var(--ease-out);
}

.speedrunner-input:checked + .speedrunner-track {
    border-color: var(--primary-light);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.32), rgba(62, 50, 40, 0.08)), var(--primary-glow);
}

.speedrunner-input:checked + .speedrunner-track .speedrunner-thumb { transform: translateX(18px); }
.speedrunner-input:focus-visible + .speedrunner-track { outline: 2px solid var(--border-focus); outline-offset: 3px; }
.speedrunner-control:active .speedrunner-track { transform: scale(0.97); }

@supports not (backdrop-filter: blur(1px)) {
    .speedrunner-track { background: var(--surface); }
}

@media (prefers-reduced-transparency: reduce), (prefers-contrast: more) {
    .speedrunner-track { background: var(--surface); backdrop-filter: none; -webkit-backdrop-filter: none; }
}

@media (prefers-contrast: more) {
    .speedrunner-track { border: 2px solid var(--text-primary); }
}

@media (prefers-reduced-motion: reduce) {
    .speedrunner-track { transition: background-color 120ms ease-out, border-color 120ms ease-out; }
    .speedrunner-thumb { transition: none; }
    .speedrunner-control:active .speedrunner-track { transform: none; }
}

/* Duels lobby & gaming elements */
.duel-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 1024px) {
    .duel-wrapper {
        grid-template-columns: 2fr 1fr;
    }
}