.concept-flashcard-modal {
    --cfm-safe-top: max(0.75rem, env(safe-area-inset-top));
    --cfm-safe-bottom: max(0.75rem, env(safe-area-inset-bottom));
}

.concept-flashcard-launch-row {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.concept-flashcard-launch-label {
    color: #212529;
    font-weight: 700;
}

.concept-flashcard-launch-button {
    align-items: center;
    background: #fff1f6;
    border: 1px solid #f3bdd2;
    border-radius: 999px;
    color: #8a3156;
    display: inline-flex;
    font-weight: 700;
    gap: 0.45rem;
    line-height: 1.2;
    min-height: 34px;
    padding: 0.38rem 0.78rem;
    text-decoration: none;
    transition: background-color 150ms ease, border-color 150ms ease, box-shadow 150ms ease, color 150ms ease;
}

.concept-flashcard-launch-button:hover,
.concept-flashcard-launch-button:focus {
    background: #ffe5ef;
    border-color: #e78fb2;
    box-shadow: 0 0 0 0.18rem rgba(138, 49, 86, 0.14);
    color: #742649;
}

.concept-flashcard-launch-button:disabled {
    background: #f1f3f4;
    border-color: #d7dde1;
    box-shadow: none;
    color: #8a969e;
    opacity: 0.75;
}

.concept-flashcard-launch-icon {
    flex: 0 0 auto;
}

.concept-flashcard-launch-count {
    background: rgba(138, 49, 86, 0.12);
    border-radius: 999px;
    color: #8a3156;
    font-size: 0.82em;
    font-weight: 700;
    line-height: 1;
    padding: 0.2rem 0.42rem;
}

.concept-flashcard-launch-button:disabled .concept-flashcard-launch-count {
    background: rgba(108, 117, 125, 0.12);
    color: #8a969e;
}

.concept-flashcard-modal .modal-dialog {
    margin-bottom: var(--cfm-safe-bottom);
    margin-top: var(--cfm-safe-top);
    max-width: min(960px, calc(100vw - 24px));
}

.concept-flashcard-modal .modal-dialog-centered {
    min-height: calc(100vh - var(--cfm-safe-top) - var(--cfm-safe-bottom));
}

.concept-flashcard-modal .modal-content {
    border: 0;
    border-radius: 12px;
    max-height: calc(100vh - var(--cfm-safe-top) - var(--cfm-safe-bottom));
    min-height: min(720px, calc(100vh - 40px));
    overflow: hidden;
}

.concept-flashcard-modal .modal-body {
    min-height: 0;
    overflow-y: auto;
}

.concept-flashcard-shell {
    display: flex;
    flex-direction: column;
    min-height: min(560px, calc(100vh - 180px));
}

.concept-flashcard-status {
    color: #6c757d;
    font-size: 0.95rem;
    min-height: 1.5rem;
}

.concept-flashcard-card {
    background: linear-gradient(180deg, #ffffff 0%, #fbfcfb 100%);
    border: 1px solid rgba(33, 37, 41, 0.1);
    border-radius: 12px;
    box-shadow: 0 18px 42px rgba(33, 37, 41, 0.1), 0 2px 8px rgba(33, 37, 41, 0.06);
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    justify-content: center;
    margin: 1rem 0;
    min-height: 320px;
    padding: clamp(1rem, 3vw, 2rem);
}

.concept-flashcard-card-enter {
    animation: concept-flashcard-card-enter 180ms ease-out both;
}

.concept-flashcard-side-label {
    color: #6c757d;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.concept-flashcard-front,
.concept-flashcard-back {
    font-size: clamp(1.15rem, 2vw, 1.55rem);
    line-height: 1.45;
    overflow-wrap: anywhere;
}

.concept-flashcard-back {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    margin-top: 1.5rem;
    padding-top: 1.5rem;
}

.concept-flashcard-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: center;
    width: 100%;
}

.concept-flashcard-footer {
    align-items: center;
    flex-direction: column;
    gap: 0.75rem;
    justify-content: center;
}

.concept-flashcard-reveal-actions .btn {
    min-width: 112px;
}

.concept-flashcard-primary-action,
.concept-flashcard-primary-action:hover,
.concept-flashcard-primary-action:focus {
    background: #2f5f73;
    border-color: #2f5f73;
    color: #fff;
}

.concept-flashcard-secondary-action {
    background: #eef1f3;
    border-color: #d7dde1;
    color: #3e4b55;
}

.concept-flashcard-secondary-action:hover,
.concept-flashcard-secondary-action:focus {
    background: #e1e7eb;
    border-color: #c8d1d7;
    color: #26323a;
}

.concept-flashcard-rating-actions {
    align-items: center;
    display: grid;
    gap: 0.65rem;
    grid-template-columns: repeat(4, minmax(88px, 112px));
    justify-content: center;
}

.concept-flashcard-rating {
    align-items: center;
    border: 1px solid transparent;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(33, 37, 41, 0.08);
    color: #23313a;
    display: inline-flex;
    flex-direction: column;
    font: inherit;
    font-weight: 700;
    gap: 0.16rem;
    justify-content: center;
    line-height: 1.1;
    min-height: 56px;
    padding: 0.45rem 0.6rem;
    transition: transform 120ms ease, box-shadow 120ms ease, filter 120ms ease;
}

.concept-flashcard-rating:hover,
.concept-flashcard-rating:focus {
    box-shadow: 0 6px 14px rgba(33, 37, 41, 0.12);
    filter: saturate(1.04);
    transform: translateY(-1px);
}

.concept-flashcard-rating:focus {
    outline: 3px solid rgba(47, 95, 115, 0.22);
    outline-offset: 2px;
}

.concept-flashcard-rating:disabled {
    cursor: wait;
    filter: grayscale(0.2);
    opacity: 0.72;
    transform: none;
}

.concept-flashcard-rating-time {
    color: rgba(35, 49, 58, 0.78);
    font-size: 0.78rem;
    font-weight: 800;
    min-height: 0.86rem;
}

.concept-flashcard-rating-label {
    font-size: 0.94rem;
}

.concept-flashcard-rating-again {
    background: #e9827e;
    border-color: #d87370;
}

.concept-flashcard-rating-hard {
    background: #e7b76f;
    border-color: #d6a55f;
}

.concept-flashcard-rating-good {
    background: #79d5ac;
    border-color: #64bf98;
}

.concept-flashcard-rating-easy {
    background: #82b9eb;
    border-color: #6fa6d9;
}

.concept-flashcard-error {
    color: #842029;
}

.dark-theme .concept-flashcard-card {
    background: linear-gradient(180deg, #202429 0%, #1a1f24 100%);
    border-color: rgba(255, 255, 255, 0.18);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.24), 0 2px 8px rgba(0, 0, 0, 0.2);
}

.dark-theme .concept-flashcard-back {
    border-top-color: rgba(255, 255, 255, 0.16);
}

.dark-theme .concept-flashcard-rating {
    color: #172027;
}

@keyframes concept-flashcard-card-enter {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 667px) {
    .concept-flashcard-modal {
        --cfm-safe-top: max(0.5rem, env(safe-area-inset-top));
        --cfm-safe-bottom: max(0.5rem, env(safe-area-inset-bottom));
    }

    .concept-flashcard-modal .modal-dialog {
        max-width: calc(100vw - 16px);
    }

    .concept-flashcard-modal .modal-content {
        min-height: auto;
    }

    .concept-flashcard-shell {
        min-height: min(430px, calc(100vh - 205px));
    }

    .concept-flashcard-status {
        font-size: 0.9rem;
    }

    .concept-flashcard-card {
        margin: 0.7rem 0;
        min-height: 280px;
        padding: 1.05rem;
    }

    .concept-flashcard-front,
    .concept-flashcard-back {
        font-size: 1.1rem;
    }

    .concept-flashcard-footer {
        padding-left: 0.6rem;
        padding-right: 0.6rem;
    }

    .concept-flashcard-rating-actions {
        gap: 0.35rem;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        width: 100%;
    }

    .concept-flashcard-rating {
        border-radius: 7px;
        min-height: 48px;
        min-width: 0;
        padding: 0.34rem 0.22rem;
    }

    .concept-flashcard-rating-time {
        font-size: 0.72rem;
    }

    .concept-flashcard-rating-label {
        font-size: 0.78rem;
    }

    .concept-flashcard-reveal-actions .btn {
        flex: 1 1 calc(50% - 0.5rem);
    }
}

@supports (height: 100dvh) {
    .concept-flashcard-modal .modal-dialog-centered {
        min-height: calc(100dvh - var(--cfm-safe-top) - var(--cfm-safe-bottom));
    }

    .concept-flashcard-modal .modal-content {
        max-height: calc(100dvh - var(--cfm-safe-top) - var(--cfm-safe-bottom));
        min-height: min(720px, calc(100dvh - var(--cfm-safe-top) - var(--cfm-safe-bottom)));
    }

    .concept-flashcard-shell {
        min-height: min(560px, calc(100dvh - 180px));
    }

    @media (max-width: 667px) {
        .concept-flashcard-modal .modal-content {
            min-height: auto;
        }

        .concept-flashcard-shell {
            min-height: min(430px, calc(100dvh - 205px));
        }
    }
}

@media (prefers-reduced-motion: reduce) {
    .concept-flashcard-card-enter {
        animation: none;
    }

    .concept-flashcard-rating {
        transition: none;
    }
}