/* =================================================================
   SENTENCE BUILDER V2 MODULE STYLES
   Version 2.0 - January 2026
   Video-prompted sentence construction exercise
   ================================================================= */

.sb2-module {
    animation: fadeIn 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 200px);
    gap: 16px;
}

/* =================================================================
   HEADER
   ================================================================= */

.sb2-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.sb2-header h1 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    font-size: clamp(1.2rem, 3vw, 1.5rem);
}

.sb2-header h1 i {
    color: var(--primary);
}

.sb2-header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sb2-mode-toggle {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 4px;
}

.sb2-mode-btn {
    padding: 8px 12px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 6px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.sb2-mode-btn:hover {
    color: var(--text-primary);
}

.sb2-mode-btn.active {
    background: var(--primary);
    color: white;
}

.sb2-difficulty-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}

.sb2-settings-btn {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.sb2-settings-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* =================================================================
   MAIN CONTENT
   ================================================================= */

.sb2-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* =================================================================
   VIDEO SECTION
   ================================================================= */

.sb2-video-section {
    display: flex;
    justify-content: center;
}

.sb2-video-wrapper {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 16 / 9;
    background: var(--bg-tertiary);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.sb2-video-player {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sb2-video-fallback {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-secondary);
}

.sb2-video-fallback i {
    font-size: 48px;
}

/* =================================================================
   ANSWER SECTION
   ================================================================= */

.sb2-answer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.sb2-answer-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    min-height: 80px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 600px;
}

.sb2-answer-slot {
    min-width: 80px;
    min-height: 60px;
    padding: 8px 12px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.2s ease;
}

.sb2-answer-slot--empty {
    background: var(--bg-tertiary);
}

.sb2-answer-slot--filled {
    background: var(--bg-primary);
    border-style: solid;
    border-color: var(--primary);
    cursor: pointer;
}

.sb2-answer-slot--filled:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sb2-answer-slot--correct {
    border-color: var(--success) !important;
    background: rgba(76, 175, 80, 0.1) !important;
}

.sb2-answer-slot--incorrect {
    border-color: var(--danger) !important;
    background: rgba(244, 67, 54, 0.1) !important;
    animation: shake 0.3s ease;
}

.sb2-slot-number {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

.sb2-slot-remove {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--danger);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.sb2-answer-slot--filled:hover .sb2-slot-remove {
    opacity: 1;
}

.sb2-answer-controls {
    display: flex;
    gap: 12px;
}

.sb2-play-btn,
.sb2-check-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.sb2-play-btn {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.sb2-play-btn:hover {
    background: var(--bg-secondary);
}

.sb2-check-btn {
    background: var(--primary);
    color: white;
}

.sb2-check-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* =================================================================
   FEEDBACK & HINTS
   ================================================================= */

.sb2-feedback {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    border-radius: 8px;
    width: 100%;
    max-width: 600px;
    animation: slideIn 0.3s ease;
}

.sb2-feedback--correct {
    background: rgba(76, 175, 80, 0.15);
    border: 1px solid var(--success);
}

.sb2-feedback--correct .sb2-feedback-icon {
    color: var(--success);
}

.sb2-feedback--incorrect {
    background: rgba(244, 67, 54, 0.15);
    border: 1px solid var(--danger);
}

.sb2-feedback--incorrect .sb2-feedback-icon {
    color: var(--danger);
}

.sb2-feedback--info {
    background: rgba(33, 150, 243, 0.15);
    border: 1px solid var(--info);
}

.sb2-feedback--info .sb2-feedback-icon {
    color: var(--info);
}

.sb2-feedback-icon {
    font-size: 24px;
}

.sb2-feedback-message {
    font-weight: 600;
    flex: 1;
}

.sb2-feedback-translation {
    font-style: italic;
    color: var(--text-secondary);
}

.sb2-hint {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: rgba(255, 193, 7, 0.15);
    border: 1px solid var(--warning);
    border-radius: 8px;
    width: 100%;
    max-width: 600px;
    animation: slideIn 0.3s ease;
}

.sb2-hint i {
    color: var(--warning);
    font-size: 20px;
}

.sb2-hint-text {
    color: var(--text-primary);
}

/* =================================================================
   WORD POOL SECTION
   ================================================================= */

.sb2-pool-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sb2-word-pool {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    min-height: 100px;
}

/* Text Mode Word Cards */
.sb2-word-card--text {
    padding: 12px 20px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.sb2-word-card--text:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sb2-word-card--text .sb2-word-text {
    font-size: 16px;
}

/* Picture Mode Word Cards */
.sb2-word-card--picture {
    width: 100px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sb2-word-card--picture:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sb2-card-image {
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.sb2-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.sb2-no-image {
    color: var(--text-muted);
    font-size: 24px;
}

.sb2-card-footer {
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
    background: var(--bg-secondary);
}

.sb2-card-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sb2-audio-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.sb2-audio-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.sb2-audio-btn.sb2-audio-playing {
    animation: pulse 0.5s ease;
}

/* Used Word Cards */
.sb2-word-card--used {
    opacity: 0.4;
    pointer-events: none;
    transform: scale(0.95);
}

/* =================================================================
   AFFIX SECTION
   ================================================================= */

.sb2-affix-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.sb2-affix-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 14px;
}

.sb2-affix-pool {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.sb2-affix-bubble {
    padding: 10px 16px;
    background: linear-gradient(135deg, var(--success), var(--success-dark, #388E3C));
    color: white;
    border-radius: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.sb2-affix-bubble:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.sb2-affix-bubble .sb2-audio-btn {
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.3);
    font-size: 10px;
}

.sb2-affix-bubble .sb2-audio-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

/* =================================================================
   FOOTER
   ================================================================= */

.sb2-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.sb2-progress {
    display: flex;
    gap: 8px;
}

.sb2-progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    transition: all 0.2s ease;
}

.sb2-progress-dot--complete {
    background: var(--success);
    border-color: var(--success);
}

.sb2-progress-dot--current {
    background: var(--primary);
    border-color: var(--primary);
    transform: scale(1.2);
}

.sb2-footer-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.sb2-score {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 18px;
}

.sb2-skip-btn {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.sb2-skip-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* =================================================================
   COMPLETION SCREEN
   ================================================================= */

.sb2-completion {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.sb2-completion-icon {
    font-size: 64px;
    color: var(--warning);
    margin-bottom: 24px;
    animation: bounce 1s ease;
}

.sb2-completion h2 {
    font-size: 32px;
    margin-bottom: 32px;
}

.sb2-completion-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
}

.sb2-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    min-width: 100px;
}

.sb2-stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

.sb2-stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.sb2-restart-btn {
    padding: 16px 32px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.sb2-restart-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* =================================================================
   EMPTY STATE
   ================================================================= */

.sb2-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    text-align: center;
    color: var(--text-secondary);
}

.sb2-empty-state i {
    font-size: 64px;
    color: var(--warning);
    margin-bottom: 24px;
}

.sb2-empty-state h2 {
    color: var(--text-primary);
    margin-bottom: 12px;
}

/* =================================================================
   ANIMATIONS
   ================================================================= */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-20px); }
    60% { transform: translateY(-10px); }
}

/* =================================================================
   RESPONSIVE DESIGN
   ================================================================= */

@media (max-width: 768px) {
    .sb2-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .sb2-video-wrapper {
        max-width: 100%;
    }

    .sb2-answer-bar {
        padding: 12px;
    }

    .sb2-answer-slot {
        min-width: 60px;
        min-height: 50px;
        padding: 6px 10px;
    }

    .sb2-word-card--text {
        padding: 10px 16px;
    }

    .sb2-word-card--picture {
        width: 80px;
    }

    .sb2-completion-stats {
        flex-direction: column;
        gap: 16px;
    }

    .sb2-footer {
        flex-direction: column;
        gap: 16px;
    }

    .sb2-progress {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .sb2-header-controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .sb2-word-card--picture {
        width: 70px;
    }

    .sb2-answer-controls {
        flex-direction: column;
        width: 100%;
    }

    .sb2-play-btn,
    .sb2-check-btn {
        width: 100%;
        justify-content: center;
    }
}