/* === ABAKUS UI a SOROBAN ENGINE === */

.abakus-page {
    background-color: var(--bg);
}

.abakus-app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 10px 60px;
}

.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

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

/* Dashboard */
.abakus-header-hero {
    text-align: center;
    margin-bottom: 40px;
    background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.4));
    padding: 40px 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(49, 72, 50, 0.05);
}

.abakus-header-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.abakus-header-hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 25px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.progress-panel {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.progress-info h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0;
}

.progress-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary);
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: var(--bg2);
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: 10px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Lekce */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.lesson-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.lesson-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.lesson-card.locked {
    opacity: 0.6;
    cursor: not-allowed;
    filter: grayscale(100%);
}
.lesson-card.locked:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
    border-color: var(--border);
}

.lesson-num {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--primary);
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.lesson-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.lesson-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
    flex-grow: 1;
}

.lesson-status {
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.lesson-status.completed {
    color: var(--primary);
}
.lesson-status.locked {
    color: var(--text2);
}

/* View: Lesson */
.lesson-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

.lesson-header h2 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin: 0;
    flex-grow: 1;
}

.lesson-steps-dots {
    display: flex;
    gap: 8px;
}

.step-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bg2);
    transition: background-color 0.3s;
}

.step-dot.active {
    background-color: var(--primary);
}
.step-dot.completed {
    background-color: var(--primary-light);
}

.lesson-instruction-box {
    background: var(--surface);
    padding: 25px;
    border-radius: var(--radius-md);
    border-left: 5px solid var(--primary);
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.lesson-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
}

.feedback-msg {
    text-align: center;
    margin-top: 20px;
    font-weight: 700;
    font-size: 1.2rem;
    padding: 15px;
    border-radius: var(--radius-sm);
    display: none;
}

.feedback-msg.success {
    background-color: var(--primary-light);
    color: var(--primary);
    display: block;
    animation: fadeIn 0.3s;
}

.feedback-msg.error {
    background-color: var(--red-light);
    color: var(--red);
    display: block;
    animation: fadeIn 0.3s;
}


/* ===========================
   SOROBAN (ABAKUS) COMPONENT
   =========================== */

.abacus-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
    margin: 40px 0;
    overflow-x: auto;
    padding: 20px 10px;
}

.soroban {
    background-color: #d1bfae; /* dřevěný světlý rám */
    border: 8px solid #8b5a2b; /* tmavé dřevo */
    border-radius: 8px;
    padding: 10px 20px;
    display: inline-flex;
    gap: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2), inset 0 0 10px rgba(0,0,0,0.1);
    position: relative;
    user-select: none;
    touch-action: none;
}

/* Středová dělicí příčka */
.soroban::before {
    content: '';
    position: absolute;
    top: 35%; /* Dělení: 1 korálek nahoře, 4 dole */
    left: 0;
    right: 0;
    height: 8px;
    background-color: #8b5a2b;
    z-index: 5;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.rod-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    height: 320px; /* Celková výška prutu */
    width: 44px;
}

/* Samotná tyč (prut) */
.rod-container::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    background-color: #a0a0a0; /* kovový drát */
    z-index: 1;
    box-shadow: inset 1px 0 2px rgba(0,0,0,0.5);
}

/* Značka pro jednotky (tečka na středové příčce) */
.rod-container.unit-mark::after {
    content: '';
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: #f7c400; /* zlatá tečka */
    z-index: 6;
}

/* Oblast nad příčkou (nebesa) */
.upper-deck {
    height: 35%;
    width: 100%;
    position: relative;
    z-index: 2;
}

/* Oblast pod příčkou (země) */
.lower-deck {
    height: 65%;
    width: 100%;
    position: relative;
    z-index: 2;
}

/* Korálky (Beads) */
.bead {
    width: 44px;
    height: 24px;
    background: radial-gradient(ellipse at top, #e67e22 20%, #d35400 80%);
    border-radius: 20px;
    position: absolute;
    left: 0;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3), inset 0 -3px 5px rgba(0,0,0,0.2), inset 0 2px 3px rgba(255,255,255,0.4);
    transition: top 0.15s cubic-bezier(0.2, 0.8, 0.2, 1);
    /* Barevné rozlišení sloupců (Place Values) - nastavováno přes JS */
}

.bead:active {
    filter: brightness(1.2);
}

/* Horní korálek: defaultní pozice (nahoře = 0) a aktivní pozice (dole u příčky = 5) */
.bead.upper {
    top: 5px; 
}
.bead.upper.active {
    top: calc(100% - 24px - 5px); /* Přisunutý k příčce */
}

/* Spodní korálky: defaultní pozice (dole = 0) a aktivní pozice (nahoře u příčky) */
.bead.lower {
    /* Pozice jsou kalkulovány v JS podle indexu 0-3 */
}


/* Režim procvičování nastavení */
.practice-setup {
    max-width: 800px;
    margin: 0 auto;
}

.setup-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 768px) {
    .setup-grid {
        grid-template-columns: 1fr;
    }
}

.setup-card {
    background: var(--surface);
    padding: 25px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.setup-card h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 1.05rem;
    padding: 10px 15px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--tr);
}

.radio-label:hover {
    background-color: var(--bg2);
}

.radio-label input[type="radio"] {
    accent-color: var(--primary);
    width: 18px;
    height: 18px;
}

.radio-label input[type="radio"]:checked + span {
    font-weight: 700;
    color: var(--primary);
}

/* UI pro samotné procvičování */
.practice-hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.score-badge {
    background: var(--surface);
    padding: 8px 16px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

/* ===========================
   INTERAKTIVNÍ TABULE REŽIM
   =========================== */
body.board-mode .abakus-page {
    /* Skrýt zbytečnosti */
}

body.board-mode .abakus-app-container {
    max-width: 100%;
    padding: 20px 40px;
}

body.board-mode .abacus-wrapper {
    transform: scale(1.4);
    transform-origin: top center;
    margin-bottom: 150px; /* Kompenzace scale */
}

body.board-mode .lesson-instruction-box {
    font-size: 3rem;
    text-align: center;
    padding: 40px;
}

body.board-mode .btn {
    font-size: 1.5rem;
    padding: 20px 40px;
}