:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --input-bg: #334155;
    --border-color: #475569;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Row One: Header */
.row-one header {
    text-align: center;
    margin-bottom: 2rem;
}

.row-one h1 {
    font-size: 1.8rem;
    margin: 0 0 0.5rem 0;
    font-weight: 700;
}

.row-one p {
    color: var(--text-secondary);
    margin: 0;
}

/* Row Two: Main Content */
.row-two {
    display: grid;
    grid-template-columns: 1fr 1fr 2fr;
    gap: 1rem;
    margin-bottom: 2rem;
    align-items: start;
}

.parameters-col, .lessons-col, .logs-col {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 12px;
}

.lessons-col, .logs-col {
    display: flex;
    flex-direction: column;
    height: 775px;
}

h2 {
    font-size: 1.25rem;
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.input-group {
    margin-bottom: 1rem;
    height: 85%;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

textarea, input {
    width: 100%;
    height: 100%;
    padding: 0.5rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

textarea {
    font-size: 0.9rem;
}

textarea:focus, input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.lessons-col textarea {
    flex-grow: 1;
    resize: none;
}


/* Row Three: Actions */
.row-three .actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

button, .secondary-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 200px;
    padding: 0.75rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
}

.primary-btn:hover {
    background-color: var(--accent-hover);
}

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.secondary-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.hidden {
    display: none;
}

/* Logs & Status */
.logs-col .log-area {
    background-color: #000;
    border-radius: 8px;
    padding: 1rem;
    flex-grow: 1;
    overflow-y: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.8rem;
    color: #e2e8f0;
    border: 1px solid var(--border-color);
}

.status-area {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    min-height: 1.5rem;
}

.log-entry {
    padding-bottom: 0.25rem;
    white-space: pre-wrap;
    min-height: 1rem;
}

.log-entry:last-child {
    border-bottom: none;
}

.log-placeholder {
    color: #475569;
    font-style: italic;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.log-timestamp {
    color: #64748b;
    margin-right: 0.5rem;
    font-weight: bold;
}

/* Spinner */
.spinner {
    display: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading .spinner {
    display: block;
}

/* Responsive */
@media (max-width: 992px) {
    .row-two {
        grid-template-columns: 1fr 1fr;
    }
    .logs-col {
        grid-column: 1 / 3;
    }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    .row-two {
        grid-template-columns: 1fr;
    }
    .logs-col {
        grid-column: auto;
    }
}


.log-entry.log-lesson-header {
    color: greenyellow;
}
.log-entry.log-lesson-title {
    color: lightsalmon;
}
.log-entry.log-total-time {
    color: hotpink;
}
.log-entry.log-lesson-time {
    color: grey;
}