/* 학습 페이지 레이아웃 */
.learn-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    min-height: 100dvh;
    min-width: 0;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 상단 바 */
.learn-top-bar {
    margin-bottom: 20px;
}

.learn-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 10px 15px;
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.learn-home-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* 학습자료 헤더 */
.learn-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.learn-set-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.3);
    border: 1px solid rgba(99, 102, 241, 0.5);
    border-radius: 20px;
    padding: 5px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #a5b4fc;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.learn-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 8px;
    line-height: 1.3;
}

.learn-description {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

/* 학습 콘텐츠 영역 */
.learn-content {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 40px 30px;
    margin-bottom: 30px;
    flex: 1;
    line-height: 1.8;
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.9);
}

.learn-content .markdown-h1 {
    font-size: 1.6rem;
    margin: 30px 0 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.learn-content .markdown-h2 {
    font-size: 1.35rem;
    margin: 25px 0 12px;
    color: #a5b4fc;
}

.learn-content .markdown-h3 {
    font-size: 1.15rem;
    margin: 20px 0 10px;
    color: #c4b5fd;
}

.learn-content .markdown-paragraph {
    margin-bottom: 16px;
}

.learn-content .markdown-divider {
    border: none;
    height: 1px;
    background: rgba(255, 255, 255, 0.15);
    margin: 25px 0;
}

/* 로딩 */
.learn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 40px;
    color: rgba(255, 255, 255, 0.6);
}

.learn-spinner {
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #6366f1;
    border-radius: 50%;
    animation: learn-spin 0.8s linear infinite;
}

@keyframes learn-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 에러 */
.learn-error {
    text-align: center;
    padding: 40px;
}

.learn-error p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 20px;
}

.learn-error-btn {
    display: inline-block;
    background: rgba(99, 102, 241, 0.3);
    border: 1px solid rgba(99, 102, 241, 0.5);
    border-radius: 12px;
    padding: 12px 24px;
    color: #a5b4fc;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.learn-error-btn:hover {
    background: rgba(99, 102, 241, 0.5);
}

/* 하단 네비게이션 */
.learn-nav {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 12px;
    margin-bottom: 40px;
}

.learn-nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 14px;
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.learn-nav-btn:hover:not(.disabled) {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.learn-nav-btn.disabled {
    opacity: 0.3;
    cursor: default;
    pointer-events: none;
}

.learn-nav-prev {
    flex: 1;
    justify-content: flex-start;
}

.learn-nav-list {
    flex: 0 0 auto;
    justify-content: center;
}

.learn-nav-next {
    flex: 1;
    justify-content: flex-end;
}

.nav-arrow {
    font-size: 1.2rem;
    font-weight: 700;
}

.nav-icon {
    font-size: 1.1rem;
}

.nav-label {
    font-size: 0.9rem;
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .learn-container {
        padding: 15px;
    }

    .learn-header {
        padding: 20px 15px;
    }

    .learn-title {
        font-size: 1.4rem;
    }

    .learn-content {
        padding: 25px 18px;
        font-size: 0.95rem;
    }

    .learn-nav {
        flex-wrap: wrap;
    }

    .learn-nav-prev,
    .learn-nav-next {
        flex: 1 1 40%;
    }

    .learn-nav-list {
        flex: 1 1 100%;
        order: -1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .learn-title {
        font-size: 1.2rem;
    }

    .learn-description {
        font-size: 0.9rem;
    }

    .learn-content {
        padding: 20px 15px;
        border-radius: 15px;
    }

    .learn-nav-btn {
        padding: 12px 14px;
        font-size: 0.85rem;
    }
}

/* ========== 퀴즈 바로가기 플로팅 버튼 ========== */
.quiz-floating-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4ade80, #22c55e);
    color: #020259;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(74, 222, 128, 0.4);
    cursor: pointer;
    text-decoration: none;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.quiz-floating-btn:hover {
    width: 140px;
    border-radius: 28px;
    box-shadow: 0 8px 30px rgba(74, 222, 128, 0.6);
    transform: translateY(-2px);
}

.quiz-floating-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    transition: margin 0.3s ease;
}

.quiz-floating-btn:hover .quiz-floating-icon {
    margin-right: 6px;
}

.quiz-floating-label {
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    max-width: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-width 0.3s ease, opacity 0.3s ease;
}

.quiz-floating-btn:hover .quiz-floating-label {
    max-width: 80px;
    opacity: 1;
}

@keyframes quiz-btn-pulse {
    0% { box-shadow: 0 4px 20px rgba(74, 222, 128, 0.4), 0 0 0 0 rgba(74, 222, 128, 0.5); }
    70% { box-shadow: 0 4px 20px rgba(74, 222, 128, 0.4), 0 0 0 14px rgba(74, 222, 128, 0); }
    100% { box-shadow: 0 4px 20px rgba(74, 222, 128, 0.4), 0 0 0 0 rgba(74, 222, 128, 0); }
}

.quiz-floating-btn.quiz-floating-attention {
    animation: quiz-btn-pulse 1.8s ease-out infinite;
}

.quiz-floating-btn.quiz-floating-attention:hover {
    animation: none;
}

@media (max-width: 480px) {
    .quiz-floating-btn {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
    }

    .quiz-floating-btn:hover {
        width: 130px;
    }

    .quiz-floating-icon {
        font-size: 1.2rem;
    }
}