:root {
    /* Modern purple theme with enhanced gradients */
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-hover: #5a67d8;
    --primary-light: rgba(102, 126, 234, 0.1);
    
    --success-color: #10b981;
    --success-gradient: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    
    --warning-color: #f59e0b;
    --warning-gradient: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-glass: rgba(255, 255, 255, 0.8);
    --border-color: #e5e7eb;
    
    /* Enhanced shadows for depth */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-hover: 0 12px 24px -4px rgba(102, 126, 234, 0.3);
    
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background: var(--primary-gradient);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
    line-height: 1.6;
    font-size: 14px;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@media (max-width: 640px) {
    body {
        padding: 20px 16px;
        align-items: flex-start;
    }
}

.container {
    max-width: 800px;
    width: 100%;
    background: var(--bg-white);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin: 0 auto;
    position: relative;
    backdrop-filter: blur(20px);
    animation: containerFadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes containerFadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* 移动端优化：减少 padding */
@media (max-width: 640px) {
    body {
        padding: 15px;
        align-items: flex-start;
    }
}

.container {
    max-width: 760px;
    width: 100%;
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    margin: 0 auto;
    position: relative;
}

.header {
    background: var(--primary-gradient);
    color: white;
    padding: 36px 32px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.header h1 {
    font-size: 24px;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 8px rgba(0,0,0,0.15);
    position: relative;
    z-index: 1;
}

.header p {
    font-size: 15px;
    opacity: 0.92;
    font-weight: 400;
    letter-spacing: 0.01em;
    position: relative;
    z-index: 1;
}

.header-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.header-btn {
    background: rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: white;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    border: 1.5px solid rgba(255, 255, 255, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    cursor: pointer;
    min-width: fit-content;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.header-btn:active {
    transform: translateY(-1px);
}

.content {
    padding: 30px;
}

@media (max-width: 640px) {
    .content {
        padding: 20px;
    }
}

/* Upload Area */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 48px 24px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    background: linear-gradient(to bottom, var(--bg-light), var(--bg-white));
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(102, 126, 234, 0.05), transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.upload-area:hover:not(.has-file)::before {
    opacity: 1;
}

.upload-area:hover:not(.has-file) {
    border-color: var(--primary-color);
    background: linear-gradient(to bottom, rgba(102, 126, 234, 0.08), rgba(102, 126, 234, 0.03));
    transform: translateY(-3px) scale(1.01);
    box-shadow: var(--shadow-md);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    border-style: solid;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
    transform: scale(1.02);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.upload-area.has-file {
    border-color: var(--success-color);
    border-style: solid;
    background: linear-gradient(to bottom, rgba(16, 185, 129, 0.08), rgba(16, 185, 129, 0.03));
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
}

.upload-icon {
    font-size: 56px;
    color: #cbd5e0;
    margin-bottom: 16px;
    transition: var(--transition);
    display: inline-block;
}

.upload-area:hover .upload-icon {
    transform: scale(1.1);
    color: var(--primary-color);
}

.upload-area.has-file .upload-icon {
    color: var(--success-color);
    transform: scale(1);
}

.upload-text {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.upload-hint {
    font-size: 13px;
    color: var(--text-muted);
}

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

/* Input with action button */
.input-with-action {
    display: flex;
    gap: 10px;
}

.input-with-action input {
    flex: 1;
}

.action-btn {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0 16px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    color: var(--text-secondary);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Advanced Settings & Toggles */
.advanced-settings {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    margin-bottom: 24px;
    overflow: hidden;
    transition: var(--transition);
}

.advanced-settings[open] {
    background: var(--bg-white);
    border-color: rgba(102, 126, 234, 0.4);
    box-shadow: var(--shadow-md);
}

.advanced-settings summary {
    padding: 16px 20px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    user-select: none;
    transition: var(--transition);
}

.advanced-settings summary::-webkit-details-marker {
    display: none;
}

.advanced-settings summary::after {
    content: '▼';
    margin-left: auto;
    transition: transform 0.3s ease;
    font-size: 12px;
    color: var(--text-secondary);
}

.advanced-settings[open] summary::after {
    transform: rotate(-180deg);
}

.advanced-settings-content {
    padding: 0 20px 20px;
    animation: slideDown 0.3s ease-out;
}

/* Settings Row for side-by-side toggles */
.settings-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

@media (max-width: 640px) {
    .settings-row {
        flex-direction: column;
        gap: 16px;
    }
}

/* Toggle Switches */
.toggle-group {
    flex: 1;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 12px 16px;
    transition: var(--transition);
}

.toggle-group.full-width {
    margin-bottom: 0;
}

.toggle-group:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.02);
}

.toggle-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    width: 100%;
}

.toggle-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.toggle-text small {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #cbd5e0;
    transition: .4s;
    border-radius: 24px;
}

.toggle-switch .slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.toggle-switch input:checked + .slider {
    background: var(--primary-gradient);
}

.toggle-switch input:focus + .slider {
    box-shadow: 0 0 1px var(--primary-color);
}

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

/* File Info */
.file-info {
    display: none;
    margin-bottom: 24px;
    padding: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.file-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
}

.file-info.show {
    display: block;
    animation: slideInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.file-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 14px;
}

.file-info-row:last-child {
    margin-bottom: 0;
}

.file-info-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.file-info-value {
    color: var(--text-primary);
    word-break: break-all;
    font-weight: 500;
}

/* Inputs */
.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.input-group input:not([type="checkbox"]):not([type="radio"]) {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: var(--transition);
    background: var(--bg-white);
    color: var(--text-primary);
    font-family: inherit;
}

.input-group input:not([type="checkbox"]):not([type="radio"]):focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.input-group small {
    display: block;
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 12px;
    line-height: 1.4;
}

/* Buttons */
.btn-group {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn {
    flex: 1;
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

svg.icon, .icon {
    width: 20px;
    height: 20px;
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.35);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
    opacity: 0;
    transition: var(--transition);
}

.btn-primary:hover:not(:disabled)::before {
    opacity: 1;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.5);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(-1px);
}

.btn-primary:disabled {
    background: linear-gradient(135deg, #e5e7eb, #d1d5db);
    color: #9ca3af;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-light);
    border-color: #d1d5db;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Progress Bar */
.progress-container {
    margin-bottom: 28px;
    display: none;
    background: linear-gradient(to bottom, var(--bg-light), var(--bg-white));
    padding: 24px;
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.progress-container.show {
    display: block;
    animation: slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
    from { 
        opacity: 0; 
        transform: translateY(-15px); 
        max-height: 0;
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
        max-height: 500px;
    }
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
}

.progress-bar-bg {
    height: 12px;
    background: #e5e7eb;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    margin-bottom: 20px;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    position: relative;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
    background-size: 30px 30px;
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.2) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0.2) 75%,
        transparent 75%,
        transparent
    );
    animation: progress-stripe 1.5s linear infinite;
}

@keyframes progress-stripe {
    from { background-position: 30px 0; }
    to { background-position: 0 0; }
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    position: relative;
}

.progress-step {
    flex: 1;
    text-align: center;
    color: var(--text-muted);
    position: relative;
    padding-top: 24px;
    z-index: 1;
}

/* 连接线 */
.progress-step::after {
    content: '';
    position: absolute;
    top: 8px;
    left: -50%;
    width: 100%;
    height: 2px;
    background: #e0e0e0;
    z-index: -1;
}

.progress-step:first-child::after {
    display: none;
}

/* 圆点 */
.progress-step::before {
    content: '';
    display: block;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #e0e0e0;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    transition: var(--transition);
    border: 3px solid white;
    box-shadow: 0 0 0 1px #e0e0e0;
}

.progress-step.active {
    color: var(--primary-color);
    font-weight: 600;
}

.progress-step.active::before {
    background: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    transform: translateX(-50%) scale(1.1);
}

.progress-step.completed {
    color: var(--success-color);
}

.progress-step.completed::before {
    background: var(--success-color);
    box-shadow: none;
}

.progress-step.completed::after {
    background: var(--success-color);
}

/* Status Messages */
.status {
    margin-bottom: 28px;
    padding: 18px 20px;
    border-radius: var(--border-radius-xl);
    font-size: 14px;
    display: none;
    font-weight: 500;
    line-height: 1.6;
    box-shadow: var(--shadow-sm);
    border-left: 5px solid;
}

.status.show {
    display: block;
    animation: fadeIn 0.3s, slideDown 0.3s;
}

.status.info {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    color: #1e40af;
    border-color: #3b82f6;
}

.status.success {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    color: #15803d;
    border-color: #22c55e;
}

.status.error {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    color: #b91c1c;
    border-color: #ef4444;
}

.status.warning {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    color: #b45309;
    border-color: #f59e0b;
}

/* Info Box */
.info-box {
    padding: 28px;
    background: linear-gradient(135deg, #fafbfc 0%, #f9fafb 100%);
    border-radius: var(--border-radius-xl);
    font-size: 14px;
    color: var(--text-secondary);
    border: 2px solid #e5e7eb;
    box-shadow: var(--shadow-md);
}

.info-box h3 {
    margin-bottom: 18px;
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 700;
    padding-bottom: 12px;
    border-bottom: 2px solid #e5e7eb;
}

.info-box ul {
    margin-left: 24px;
}

.info-box li {
    margin: 10px 0;
    line-height: 1.6;
}

/* Share Container */
.share-container {
    margin-bottom: 24px;
    padding: 32px;
    /* 增强的渐变背景，添加微妙的光晕 */
    background: linear-gradient(135deg, #f0f9ff 0%, #e6fffa 50%, #f0fdf4 100%);
    border-radius: var(--border-radius-xl);
    border: 2px solid #86efac;
    display: none;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.share-container::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(34, 197, 94, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.share-container.show {
    display: block;
    animation: slideDown 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.share-container h3 {
    color: #047857;
    margin-bottom: 24px;
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(4, 120, 87, 0.1);
}

.share-link-box {
    display: flex;
    gap: 14px;
    margin-bottom: 28px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.share-link-input {
    flex: 1;
    min-width: 200px;
    padding: 14px 18px;
    border: 2px solid #86efac;
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    background: white;
    color: var(--text-primary);
    height: 52px;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.08);
}

.share-link-input:focus {
    outline: none;
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15), 0 4px 8px rgba(34, 197, 94, 0.12);
    transform: translateY(-1px);
}

.copy-btn {
    padding: 14px 28px;
    background: var(--success-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    height: 52px;
    position: relative;
    overflow: hidden;
}

.copy-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.copy-btn:hover::before {
    left: 100%;
}

.copy-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    filter: brightness(1.08);
}

.copy-btn:active {
    transform: translateY(-1px);
}

.share-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.share-btn {
    flex: 1;
    min-width: 140px;
    padding: 14px 24px;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 50px;
}

.open-btn {
    background: linear-gradient(135deg, #42a5f5 0%, #1e88e5 50%, #1976d2 100%);
    color: white;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.open-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.open-btn:hover::before {
    width: 300px;
    height: 300px;
}

.open-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.reset-btn {
    background: white;
    color: var(--text-secondary);
    border: 2px solid #e5e7eb;
    box-shadow: var(--shadow-sm);
}

.reset-btn:hover {
    background: #f9fafb;
    color: var(--text-primary);
    border-color: #d1d5db;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Video Player Styles */
.video-info {
    background: linear-gradient(135deg, #fafbfc 0%, #f3f4f6 100%);
    padding: 28px;
    border-radius: var(--border-radius-xl);
    margin-bottom: 28px;
    border: 1px solid #e5e7eb;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.video-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.video-info h2 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 16px;
    border-bottom: 2px solid #e5e7eb;
}

.info-item {
    display: flex;
    margin-bottom: 14px;
    font-size: 14px;
    padding: 12px 0;
    border-bottom: 1px solid #f3f4f6;
    transition: var(--transition);
}

.info-item:hover {
    background: rgba(102, 126, 234, 0.03);
    padding-left: 8px;
    margin-left: -8px;
    border-radius: var(--border-radius);
}

.info-item:last-child {
    margin-bottom: 0;
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: var(--text-secondary);
    width: 90px;
    flex-shrink: 0;
}

.info-value {
    color: var(--text-primary);
    word-break: break-all;
    flex: 1;
}

.video-player {
    margin-bottom: 28px;
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: linear-gradient(135deg, #1a1a1a 0%, #000000 100%);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 3px solid rgba(102, 126, 234, 0.2);
    transition: var(--transition);
}

.video-wrapper:hover {
    border-color: rgba(102, 126, 234, 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(102, 126, 234, 0.1);
}

video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    outline: none;
}

.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 15px;
    text-align: center;
    font-weight: 500;
    width: 100%;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.15);
    border-top: 4px solid white;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    margin: 0 auto 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Key Input */
.key-input-container {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 50%, #fff8e1 100%);
    border: 2px solid #fbbf24;
    border-radius: var(--border-radius-xl);
    padding: 32px;
    margin-bottom: 28px;
    display: none;
    animation: fadeIn 0.3s;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.key-input-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(251, 191, 36, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

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

.key-input-container.show {
    display: block;
}

.key-input-container h3 {
    color: #b45309;
    margin-bottom: 20px;
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(180, 83, 9, 0.1);
}

.key-input-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.key-input {
    flex: 1;
    min-width: 200px;
    padding: 14px 18px;
    border: 2px solid #fbbf24;
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
    background: white;
    box-shadow: 0 2px 4px rgba(251, 191, 36, 0.1);
}

.key-input:focus {
    border-color: #f59e0b;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2), 0 4px 8px rgba(251, 191, 36, 0.15);
    transform: translateY(-1px);
}

.unlock-btn {
    padding: 14px 28px;
    background: var(--warning-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.unlock-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.unlock-btn:hover:not(:disabled)::before {
    left: 100%;
}

.unlock-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    filter: brightness(1.08);
}

.unlock-btn:active:not(:disabled) {
    transform: translateY(-1px);
}

.key-error {
    color: var(--error-color);
    font-size: 13px;
    margin-top: 10px;
    display: none;
    font-weight: 500;
}

.key-error.show {
    display: block;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer {
    padding: 28px;
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
    border-top: 2px solid var(--border-color);
    background: linear-gradient(135deg, #fafbfc 0%, #f9fafb 100%);
    margin-top: 32px;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer a:hover {
    text-decoration: underline;
    color: #5568d3;
}

/* Share Management */
.card {
    background: white;
    border-radius: var(--border-radius-xl);
    padding: 32px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-lg);
    border: 2px solid #f3f4f6;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-xl);
    border-color: #e5e7eb;
}

.shares-list {
    margin-top: 28px;
}

.share-item {
    background: #fff;
    border: 2px solid #f3f4f6;
    border-radius: var(--border-radius-xl);
    padding: 24px;
    margin-bottom: 18px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.share-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.share-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.share-item:hover::before {
    opacity: 1;
}

.share-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 12px;
}

.share-id {
    font-family: ui-monospace, monospace;
    font-weight: 700;
    color: var(--primary-color);
    background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
    padding: 6px 12px;
    border-radius: var(--border-radius);
    font-size: 14px;
    border: 1px solid #ce93d8;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.1);
}

.delete-button {
    background: white;
    color: var(--error-color);
    border: 2px solid #fecaca;
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.delete-button:hover {
    background: #fef2f2;
    border-color: #fca5a5;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.delete-button:active {
    transform: translateY(0);
}

.share-details {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
}

.share-details div {
    margin-bottom: 4px;
}

.toast {
    position: fixed;
    top: 32px;
    right: 32px;
    background: rgba(17, 24, 39, 0.95);
    color: white;
    padding: 16px 28px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.1);
    z-index: 1000;
    display: none;
    font-size: 15px;
    font-weight: 500;
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.toast.show {
    display: block;
    animation: slideInToast 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes slideInToast {
    from { 
        transform: translateX(calc(100% + 32px)) scale(0.9); 
        opacity: 0;
    }
    to { 
        transform: translateX(0) scale(1); 
        opacity: 1;
    }
}

/* Error Message */
.error-message {
    background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
    color: #b91c1c;
    padding: 20px;
    border-radius: var(--border-radius-xl);
    margin-bottom: 28px;
    text-align: center;
    display: none;
    border: 2px solid #fca5a5;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.error-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #dc2626, #ef4444, #dc2626);
}

.error-message.show {
    display: block;
    animation: shake 0.5s, fadeIn 0.3s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-6px); }
    20%, 40%, 60%, 80% { transform: translateX(6px); }
}

.error-message h3 {
    font-size: 17px;
    margin-bottom: 10px;
    font-weight: 700;
}

/* Common UI */
.common-toast { 
    position: fixed; 
    top: 20px; 
    right: 20px; 
    background: #43a047; 
    color: white; 
    padding: 12px 20px; 
    border-radius: 8px; 
    box-shadow: 0 8px 24px rgba(0,0,0,0.15); 
    z-index: 9999; 
    opacity: 0; 
    transition: opacity .3s, transform .3s; 
    transform: translateY(-20px);
}
.common-toast.show { 
    opacity: 1; 
    transform: translateY(0); 
}

/* Filter Section */
.filter-container {
    margin-bottom: 28px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    flex-wrap: wrap;
    background: linear-gradient(135deg, #fafbfc 0%, #f9fafb 100%);
    padding: 20px 24px;
    border-radius: var(--border-radius-xl);
    border: 2px solid #e5e7eb;
    box-shadow: var(--shadow-sm);
}

.filter-row {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 14px;
}

.filter-group-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    padding-right: 8px;
    border-right: 2px solid #e5e7eb;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-label {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
}

.filter-input {
    padding: 10px 14px;
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-white);
    transition: var(--transition);
    outline: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.filter-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15), 0 2px 4px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.filter-btn {
    padding: 10px 24px;
    height: 42px;
    font-size: 14px;
    flex: initial;
    width: auto;
}

/* Responsive Overrides */
@media (max-width: 640px) {
    .btn-group, .actions, .share-actions, .key-input-group {
        flex-direction: column;
        gap: 18px;
    }

    .header-actions {
        flex-wrap: wrap;
        gap: 10px;
    }

    .header-btn {
        padding: 10px 16px;
        font-size: 13px;
        min-height: 42px;
    }

    .btn, .share-btn, .unlock-btn, .key-input, .share-link-input, .copy-btn {
        width: 100%;
        min-height: 56px;
    }

    .share-link-input {
        min-width: 0;
    }

    .input-group input {
        min-height: 56px;
    }

    .progress-steps {
        display: none;
    }

    .header h1 {
        font-size: 22px;
    }

    .header p {
        font-size: 15px;
    }

    .filter-container {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .filter-group {
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
    }

    .filter-item {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .filter-input {
        width: 100%;
    }

    .container {
        padding: 20px;
    }

    .header {
        padding: 28px;
    }

    .share-container,
    .key-input-container {
        padding: 24px;
    }

    .toast {
        left: 16px;
        right: 16px;
        top: 16px;
    }

    .video-wrapper {
        border-radius: var(--border-radius-lg);
    }

    .share-item {
        padding: 20px;
    }

    .share-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .delete-button {
        width: 100%;
        justify-content: center;
        display: flex;
        align-items: center;
    }
}

/* WeChat Overlay Styles */
.wechat-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: none; /* Controlled by JS */
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.wechat-modal {
    background: white;
    width: 85%;
    max-width: 320px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

.wechat-modal-content {
    padding: 30px 24px;
    text-align: center;
}

.wechat-modal h2 {
    color: var(--primary-color);
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 700;
}

.wechat-guide-callout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 18px;
    padding: 12px 14px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.12), rgba(118, 75, 162, 0.08));
    color: var(--primary-color);
}

.wechat-guide-arrow {
    font-size: 28px;
    line-height: 1;
    transform: translate(2px, -2px);
}

.wechat-guide-text {
    max-width: 180px;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.5;
    text-align: left;
}

.wechat-modal p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 24px;
    line-height: 1.6;
}

.wechat-modal-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.wechat-modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
    filter: brightness(1.05);
}

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

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.wechat-pulse .wechat-modal {
    animation: modalPulse 0.4s ease-in-out;
}

@keyframes modalPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}