:root {
    --bg-start: #0B1026;
    --bg-end: #4F46E5;
    --accent: #06B6D4;
    --container-bg: #FFFFFF;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
    margin: 0;
    padding: 20px;
    display: block;
    min-height: 100vh;
    transition: background 0.5s;
}

.container h1 { color: var(--accent); }

.container {
    width: 1100px;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    margin: 0 auto;
}

label { font-weight: bold; color: #0072df; margin-bottom: 1px; display: block; font-size: 12px; }

select, input[type="text"], input[type="password"], input[type="number"], textarea {
    width: 100%;
    padding: 6px 8px;
    font-size: 13px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

textarea { font-family: 'Consolas', 'Courier New', monospace; font-size: 12px; resize: vertical; }

button.action-btn {
    background-color: var(--accent);
    color: white;
    padding: 6px 12px;
    font-size: 14px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

button.action-btn:hover { filter: brightness(1.2); }

button.action-btn:disabled {
    background-color: #ccc;
    color: #888;
    cursor: not-allowed;
}

button.action-btn.download-all { font-size: 13px; padding: 8px 14px; }

.api-key-container {
    background: #eef7ff;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid #cce5ff;
}

.api-row { display: flex; gap: 6px; }

.api-row input { flex: 1; }

.api-row button {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
}

.api-row button:hover { filter: brightness(1.2); }

.file-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-input-wrapper input[type="file"] { display: none; }

.custom-file-upload {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    white-space: nowrap;
    transition: background-color 0.2s;
}

.custom-file-upload:hover { filter: brightness(1.2); }

.custom-file-upload.disabled {
    background-color: #ccc;
    color: #888;
    cursor: not-allowed;
    pointer-events: none;
}

#pdf-name {
    font-style: italic;
    color: #666;
    font-size: 0.9em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#pdf-status {
    font-weight: bold;
    margin-top: 4px;
    font-size: 0.85em;
}

#json_output { font-family: 'Consolas', 'Courier New', monospace; }

footer { border-top: 1px solid #e0e0e0; }

#slide-container { position: relative; }
#slide-img { transition: opacity 0.3s; }

input:disabled, textarea:disabled {
    background-color: #e9ecef;
    cursor: not-allowed;
    opacity: 0.7;
}

#topicInput, #descriptionInput {
    transition: opacity 0.3s, background-color 0.3s;
}

.palette-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-left: 6px;
    vertical-align: middle;
    border: 1px solid rgba(255,255,255,0.3);
}