:root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --btn-kofi: #ff5e5b;
    --btn-kofi-hover: #ef4444;
    --success: #10b981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
    box-sizing: border-box;
}

.container {
    background-color: var(--card);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
    max-width: 550px;
    width: 100%;
    text-align: center;
    transition: all 0.3s ease;
}

h1 { font-size: 1.6rem; color: var(--accent); margin-top: 0; margin-bottom: 0.5rem; }
.subtitle { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 2rem; line-height: 1.4; }

/* File Upload Zone */
.file-zone {
    display: block;
    border: 2px dashed #475569;
    border-radius: 12px;
    padding: 3rem 2rem;
    cursor: pointer;
    background-color: #111827;
    transition: all 0.2s ease;
}

.file-zone.dragover {
    border-color: var(--accent);
    background-color: #1e293b;
    transform: scale(1.02);
}

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

.status { margin-top: 1.5rem; font-size: 0.95rem; color: var(--text-muted); font-weight: 500; }

/* Linear Progress Bar */
.progress-bar-container {
    width: 100%;
    background-color: #111827;
    border-radius: 100px;
    margin-top: 1rem;
    display: none;
    overflow: hidden;
}

.progress-bar {
    height: 6px;
    width: 0%;
    background-color: var(--accent);
    transition: width 0.1s linear;
}

/* Post-Processing Actions Section */
.donation-box {
    display: none;
    background: #111827;
    border: 1px solid #334155;
    padding: 2rem;
    border-radius: 12px;
    margin-top: 1.5rem;
    animation: fadeIn 0.4s ease forwards;
}

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

.donation-box h3 { margin-top: 0; color: var(--success); font-size: 1.3rem; }
.donation-box p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.5rem; }

.flex-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn {
    background-color: var(--accent);
    color: #0f172a;
    border: none;
    padding: 0.85rem 1.5rem;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
    width: 100%;
    box-sizing: border-box;
}

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

.btn-kofi {
    display: block;
    padding: 0.85rem 1.5rem;
    background-color: var(--btn-kofi);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1rem;
    transition: background 0.2s;
    box-sizing: border-box;
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-decoration: underline;
    border: none;
    cursor: pointer;
    margin-top: 0.5rem;
}

.btn-secondary:hover { color: var(--text); }

.privacy-note {
    font-size: 0.8rem;
    color: #64748b;
    margin-top: 2rem;
}

/* Config Controls Component */
.config-panel {
    background-color: #111827;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    text-align: left;
}

.config-panel h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1rem;
    color: var(--text);
    font-weight: 600;
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 1rem;
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    transition: opacity 0.2s ease;
}

.config-group label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.config-group select {
    background-color: var(--card);
    color: var(--text);
    border: 1px solid #475569;
    border-radius: 6px;
    padding: 0.5rem;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.config-group select:focus {
    border-color: var(--accent);
}

.config-group select:disabled {
    cursor: not-allowed;
    background-color: #1e293b;
}

/* SEO Technical Content Layout */
.seo-divider {
    border: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
    margin: 40px 0;
}

.seo-content {
    text-align: left;
    max-width: 800px;
    margin: 0 auto;
    color: #a0aec0;
    font-size: 0.95rem;
    line-height: 1.6;
}

.seo-content h2 {
    color: #fff;
    font-size: 1.4rem;
    margin-top: 30px;
    margin-bottom: 15px;
}

.faq-grid {
    margin-top: 20px;
}

.faq-item {
    margin-bottom: 25px;
}

.faq-item h3 {
    color: var(--accent, #6366f1);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.seo-content strong {
    color: #fff;
}

/* Global Navigation Header */
.main-header {
    width: 100%;
    padding: 15px 0;
    display: flex;
    justify-content: center;
    box-sizing: border-box;
}

.header-container {
    width: 100%;
    max-width: 1000px;
    display: flex;
    justify-content: flex-end;
    padding: 0 20px;
    box-sizing: border-box;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #a0aec0;
    text-decoration: none;
    font-family: sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease, transform 0.2s ease;
    padding: 6px 12px;
    border-radius: 6px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.github-link:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Responsive Navigation Adjustments */
@media (max-width: 600px) {
    .header-container {
        justify-content: center;
    }
}