/* ── Assessment hero card ─────────────────────────────────── */

.exam-card-link,
.exam-card-link:hover,
.exam-card-link:focus,
.exam-card-link:active {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.exam-start-button {
    --card-accent:       #10b981;
    --card-accent-soft:  rgba(16, 185, 129, 0.10);
    --card-accent-muted: rgba(16, 185, 129, 0.50);

    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    min-height: 220px;
    padding: 48px 40px;
    background: transparent;
    border: 2px solid var(--card-accent);
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-align: center;
    box-shadow: 0 6px 24px rgba(16, 185, 129, 0.15);
    transition: box-shadow 0.2s, transform 0.15s;
    font-family: Roboto, Arial, sans-serif;
}
.exam-start-button:hover {
    box-shadow: 0 10px 32px rgba(16, 185, 129, 0.30);
    transform: translateY(-2px);
}
.exam-start-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

@keyframes float-bob {
    0%   { transform: translateY(0px)  rotate(0deg); }
    100% { transform: translateY(-8px) rotate(3deg); }
}

/* floating math decoration */
.exam-math-deco {
    position: absolute;
    color: var(--card-accent-soft);
    font-weight: 700;
    pointer-events: none;
    user-select: none;
    line-height: 1;
    font-family: 'Georgia', serif;
    animation: float-bob 3s ease-in-out infinite alternate;
}

.exam-math-deco:nth-child(1) { animation-delay:  0s;    animation-duration: 3.2s; }
.exam-math-deco:nth-child(2) { animation-delay: -1.1s;  animation-duration: 2.8s; }
.exam-math-deco:nth-child(3) { animation-delay: -2.0s;  animation-duration: 3.5s; }
.exam-math-deco:nth-child(4) { animation-delay: -0.6s;  animation-duration: 2.6s; }
.exam-math-deco:nth-child(5) { animation-delay: -1.7s;  animation-duration: 3.0s; }
.exam-math-deco:nth-child(6) { animation-delay: -0.3s;  animation-duration: 3.8s; }
.exam-math-deco:nth-child(7) { animation-delay: -2.4s;  animation-duration: 2.9s; }
.exam-math-deco:nth-child(8) { animation-delay: -1.5s;  animation-duration: 3.3s; }

/* centered inner content */
.exam-button-inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: opacity 0.22s;
}
.exam-start-button:hover .exam-button-inner {
    opacity: 0;
    pointer-events: none;
}

.exam-button-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    background: var(--card-accent-soft);
    border: 1px solid var(--card-accent-muted);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--card-accent);
}

.exam-button-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--card-accent);
    margin: 0;
    line-height: 1.2;
}

.exam-button-text {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
    max-width: 280px;
    min-height: 4.5rem;
}

@keyframes shimmer-sweep {
    0%   { transform: translateX(-150%) skewX(-20deg); }
    20%  { transform: translateX(350%)  skewX(-20deg); }
    100% { transform: translateX(350%)  skewX(-20deg); }
}

.exam-button-cta {
    margin-top: 8px;
    display: inline-block;
    padding: 10px 28px;
    border-radius: var(--radius-full);
    background: transparent;
    border: 1.5px solid var(--card-accent);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--card-accent);
    letter-spacing: 0.02em;
    transition: background 0.15s;
    position: relative;
    overflow: hidden;
}

.exam-button-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    width: 40%;
    background: linear-gradient(to right, transparent 0%, rgba(255,255,255,0.45) 50%, transparent 100%);
    transform: translateX(-150%) skewX(-20deg);
    animation: shimmer-sweep 4s ease-in-out infinite;
}
.exam-start-button:hover .exam-button-cta {
    background: var(--card-accent-soft);
}

/* ── Fast test variant (blue) ─────────────────────────────── */
.exam-start-button--fast {
    --card-accent:       #3b82f6;
    --card-accent-soft:  rgba(59, 130, 246, 0.10);
    --card-accent-muted: rgba(59, 130, 246, 0.50);
    box-shadow: 0 6px 24px rgba(59, 130, 246, 0.15);
}
.exam-start-button--fast:hover {
    box-shadow: 0 10px 32px rgba(59, 130, 246, 0.30);
}
.exam-start-button--fast:active {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}
[data-theme="dark"] .exam-start-button--fast {
    --card-accent:       #a78bfa;
    --card-accent-soft:  rgba(167, 139, 250, 0.10);
    --card-accent-muted: rgba(167, 139, 250, 0.50);
    box-shadow: 0 6px 24px rgba(167, 139, 250, 0.15);
}
[data-theme="dark"] .exam-start-button--fast:hover  { box-shadow: 0 10px 32px rgba(167, 139, 250, 0.30); }
[data-theme="dark"] .exam-start-button--fast:active { box-shadow: 0 4px 12px rgba(167, 139, 250, 0.15); }

/* ── Hover question preview (full card replacement) ───────── */
.exam-preview-question {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 28px;
    gap: 10px;
    background: var(--color-surface);
    border-radius: calc(var(--radius-lg) - 2px);
    opacity: 0;
    transition: opacity 0.22s;
}
.exam-start-button:hover .exam-preview-question {
    opacity: 1;
}

.exam-preview-difficulty {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--card-accent);
    margin: 0;
}

.exam-preview-expr {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--color-text-dark);
    margin: 0;
    text-align: center;
    line-height: 1.3;
}

.exam-preview-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
    width: 100%;
    margin-top: 4px;
}

.exam-preview-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-background);
}

.exam-preview-option-letter {
    width: 22px;
    height: 22px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.7rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.exam-preview-option-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.exam-preview-input-mock {
    width: 100%;
    padding: 11px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-background);
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: 4px;
}