/* PDF Security Tool - Cloudflare Pages Optimized */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-red: #f85149;
    --accent-green: #3fb950;
    --accent-blue: #58a6ff;
    --accent-yellow: #d29922;
    --accent-purple: #a371f7;
    --danger: #da3633;
    --success: #238636;
    --warning: #9e8a00;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Sections */
section {
    margin-bottom: 1.5rem;
}

section h2, section h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

section h4 {
    font-size: 1rem;
    color: var(--text-primary);
}

.hint {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.75rem;
}

/* Mode Selection */
.mode-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.mode-btn:hover {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.mode-btn.active {
    border-color: var(--accent-blue);
    background: rgba(88, 166, 255, 0.1);
    color: var(--text-primary);
}

.mode-btn .icon {
    font-size: 1.5rem;
}

.mode-btn .label {
    font-size: 0.9rem;
    font-weight: 600;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
    background: var(--bg-secondary);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--accent-blue);
    background: rgba(88, 166, 255, 0.05);
}

.drop-zone.dragover {
    border-style: solid;
    transform: scale(1.01);
}

.drop-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.75rem;
}

.drop-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.drop-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* File List */
.file-list {
    margin-top: 1rem;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.file-item:hover {
    border-color: var(--accent-blue);
}

.file-item .file-icon {
    font-size: 1.25rem;
}

.file-item .file-info {
    flex: 1;
    min-width: 0;
}

.file-item .file-name {
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-item .file-size {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.file-item .file-remove {
    background: none;
    border: none;
    color: var(--accent-red);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0.25rem;
    border-radius: 4px;
    transition: background 0.2s;
}

.file-item .file-remove:hover {
    background: rgba(248, 81, 73, 0.1);
}

/* Merge List */
.merge-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.merge-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s;
}

.merge-item:hover {
    border-color: var(--accent-blue);
}

.merge-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.merge-item .drag-handle {
    color: var(--text-secondary);
    cursor: grab;
    font-size: 1.1rem;
}

.merge-item .merge-index {
    background: var(--accent-blue);
    color: var(--bg-primary);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Form Groups */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
}

.password-input {
    display: flex;
    gap: 0.5rem;
}

.password-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.password-input input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.password-input input::placeholder {
    color: var(--text-secondary);
}

.toggle-pwd {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.toggle-pwd:hover {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

/* Strength Meter */
.strength-meter {
    height: 4px;
    margin-top: 0.5rem;
    border-radius: 2px;
    background: var(--bg-tertiary);
    overflow: hidden;
    transition: all 0.3s;
}

.strength-meter::after {
    content: '';
    display: block;
    height: 100%;
    border-radius: 2px;
    transition: all 0.3s;
    width: 0%;
}

.strength-meter.weak::after {
    width: 33%;
    background: var(--accent-red);
}

.strength-meter.fair::after {
    width: 66%;
    background: var(--accent-yellow);
}

.strength-meter.strong::after {
    width: 100%;
    background: var(--accent-green);
}

/* Radio Group */
.radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.radio-label:hover {
    border-color: var(--accent-blue);
}

.radio-label input[type="radio"] {
    accent-color: var(--accent-blue);
}

.radio-label:has(input:checked) {
    border-color: var(--accent-blue);
    background: rgba(88, 166, 255, 0.1);
}

/* Permissions Section */
.permissions-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    margin-top: 1rem;
}

.permissions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.lockdown-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.lockdown-btn:hover {
    background: #b62324;
    transform: translateY(-1px);
}

.permissions-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

@media (min-width: 600px) {
    .permissions-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Permission Toggle */
.perm-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.perm-toggle:hover {
    border-color: var(--border-color);
}

.perm-toggle input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--danger);
    border-radius: 12px;
    transition: background 0.3s;
    flex-shrink: 0;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.perm-toggle input:checked + .toggle-slider {
    background: var(--success);
}

.perm-toggle input:checked + .toggle-slider::after {
    transform: translateX(20px);
}

.perm-label {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.perm-name {
    font-size: 0.9rem;
    font-weight: 500;
}

.perm-status {
    font-size: 0.8rem;
    color: var(--accent-red);
    transition: color 0.3s;
}

.perm-toggle input:checked ~ .perm-label .perm-status {
    color: var(--accent-green);
}

/* Action Button */
.action-section {
    text-align: center;
    margin-top: 2rem;
}

.process-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.4);
}

.process-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
}

.btn-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.status-text {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-height: 1.5rem;
}

.status-text.error {
    color: var(--accent-red);
}

.status-text.success {
    color: var(--accent-green);
}

/* Output Section */
.output-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.output-info {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    background: var(--success);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.2s;
}

.download-btn:hover {
    background: #2ea043;
    transform: translateY(-1px);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer p {
    margin-bottom: 0.25rem;
}

/* Utilities */
.hidden {
    display: none !important;
}

.options-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection */
::selection {
    background: rgba(88, 166, 255, 0.3);
    color: var(--text-primary);
}

/* Pyodide-specific styles */
.pyodide-status {
    text-align: center;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--accent-yellow);
    margin-top: 0.75rem;
    transition: all 0.3s;
}

.pyodide-status.ready {
    color: var(--accent-green);
    border-color: var(--accent-green);
}

.pyodide-status.error {
    color: var(--accent-red);
    border-color: var(--accent-red);
}