/* ===== CSS Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #00f2fe;
    --warning-color: #fee140;
    --error-color: #f5576c;
    
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #6b6b8c;
    
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

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

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.app-container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* ===== Header ===== */
.app-header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--glass-shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    stroke: url(#gradient);
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-stats {
    display: flex;
    gap: 2rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Upload Section ===== */
.upload-section {
    margin-bottom: 2rem;
}

.upload-zone {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: var(--transition);
}

.upload-zone:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
}

.upload-zone:hover::before {
    opacity: 0.05;
}

.upload-zone.drag-over {
    border-color: var(--success-color);
    background: rgba(0, 242, 254, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    position: relative;
    z-index: 1;
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--primary-color);
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.5));
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-zone h2 {
    position: relative;
    z-index: 1;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-zone p {
    position: relative;
    z-index: 1;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ===== Buttons ===== */
.btn-browse,
.btn-primary,
.btn-secondary {
    position: relative;
    z-index: 1;
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    overflow: hidden;
}

.btn-browse,
.btn-primary {
    background: var(--primary-gradient);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-browse:hover,
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.6);
}

.btn-browse:active,
.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

.btn-primary svg,
.btn-secondary svg {
    width: 18px;
    height: 18px;
}

/* ===== Files Section ===== */
.files-section {
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.batch-controls {
    display: flex;
    gap: 1rem;
}

.files-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.file-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.file-card:hover {
    transform: translateX(4px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.2);
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.file-info {
    flex: 1;
}

.file-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.file-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: var(--border-radius-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-secondary);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

.btn-icon:hover svg {
    stroke: var(--primary-color);
}

.btn-icon.delete:hover {
    border-color: var(--error-color);
}

.btn-icon.delete:hover svg {
    stroke: var(--error-color);
}

.page-selector {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}

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

.page-input {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

.page-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.page-input::placeholder {
    color: var(--text-muted);
}

/* ===== Status Section ===== */
.status-section {
    margin-bottom: 2rem;
}

.status-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2rem;
}

.status-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.status-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.status-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.idle {
    background: rgba(107, 107, 140, 0.2);
    color: var(--text-muted);
}

.status-badge.processing {
    background: var(--primary-gradient);
    color: var(--text-primary);
    animation: pulse 2s ease-in-out infinite;
}

.status-badge.completed {
    background: var(--success-gradient);
    color: var(--text-primary);
}

.status-badge.error {
    background: var(--secondary-gradient);
    color: var(--text-primary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 4px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.progress-text {
    font-size: 1rem;
    font-weight: 600;
    min-width: 50px;
    text-align: right;
}

.status-details {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    min-width: 300px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast-icon {
    width: 20px;
    height: 20px;
}

.toast-message {
    flex: 1;
    font-size: 0.875rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-stats {
        width: 100%;
        justify-content: space-around;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .batch-controls {
        width: 100%;
    }
    
    .batch-controls button {
        flex: 1;
    }
    
    .file-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
    }
    
    .toast {
        min-width: auto;
    }
}