/* truth.css */

/* --- Layout --- */
#app-wrapper {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
    background-color: var(--bg-main);
}

/* --- Sidebar (Menu) --- */
#sidebar {
    width: 260px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.level-btn {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-main);
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.level-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-hover);
    transform: translateY(-2px);
}

.level-btn.active {
    border-color: var(--accent-primary);
    background: rgba(0, 198, 251, 0.1);
    /* Low opacity accent */
    box-shadow: 0 0 0 1px var(--accent-primary);
}

.lvl-title {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-main);
    display: block;
}

.lvl-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
    display: block;
}

#new-q-btn {
    margin-top: auto;
    padding: 15px;
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#new-q-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

/* --- Main Content --- */
#workspace {
    flex-grow: 1;
    overflow-y: auto;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Logic Expression Display */
#expression-box {
    background: var(--bg-panel);
    padding: 30px 50px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    margin-bottom: 40px;
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    overflow: hidden;
}

#expression-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.expr-label {
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.expr-text {
    font-family: 'Fira Code', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    text-shadow: 0 0 10px rgba(0, 198, 251, 0.2);
}

/* The Table */
table {
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-panel);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    min-width: 400px;
}

th {
    background: var(--bg-card);
    color: var(--text-main);
    font-weight: 700;
    padding: 18px 30px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    border-bottom: 2px solid var(--border-color);
}

td {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 20px;
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-family: 'Fira Code', monospace;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background-color: var(--bg-hover);
}

/* Inputs */
.t-input {
    width: 60px;
    padding: 10px;
    font-family: 'Fira Code', monospace;
    font-size: 1.2rem;
    text-align: center;
    background: var(--bg-main);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    outline: none;
    transition: all 0.2s;
    font-weight: bold;
}

.t-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 198, 251, 0.2);
}

/* Validation Styles */
.t-input.correct {
    background-color: rgba(22, 163, 74, 0.2);
    border-color: #16a34a;
    color: #4ade80;
}

.t-input.wrong {
    background-color: rgba(220, 38, 38, 0.2);
    border-color: #dc2626;
    color: #f87171;
}

/* Action Area */
.action-area {
    margin-top: 40px;
    display: flex;
    gap: 15px;
}

.check-btn {
    padding: 14px 40px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 800;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 198, 251, 0.4);
    transition: transform 0.1s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.check-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.check-btn:active {
    transform: translateY(0);
}

/* Feedback Banner */
#feedback-banner {
    position: fixed;
    top: 90px;
    /* Adjust based on header height */
    left: 50%;
    transform: translateX(-50%) translateY(-150%);
    min-width: 300px;
    padding: 15px 30px;
    text-align: center;
    font-weight: bold;
    font-size: 1rem;
    transition: transform 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    z-index: 100;
    border-radius: 50px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    color: var(--text-main);
}

#feedback-banner.show {
    transform: translateX(-50%) translateY(0);
}

#feedback-banner.success {
    border-color: #16a34a;
    color: #4ade80;
    background: rgba(22, 163, 74, 0.1);
}

#feedback-banner.fail {
    border-color: #dc2626;
    color: #f87171;
    background: rgba(220, 38, 38, 0.1);
}