/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

:root {
    --bg-color: #060813;
    --card-bg: rgba(13, 17, 35, 0.75);
    --card-border: rgba(255, 255, 255, 0.07);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --color-indigo: #8b5cf6;
    --color-cyan: #06b6d4;
    --color-magenta: #ec4899;
    --color-emerald: #10b981;
    --color-amber: #f59e0b;
    
    --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #ec4899 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    --gradient-glow: 0 8px 32px 0 rgba(139, 92, 246, 0.25);
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Cosmic Nebula Background Blobs */
body::before, body::after {
    content: '';
    position: fixed;
    width: 40vw;
    height: 40vw;
    border-radius: 50%;
    z-index: -1;
    filter: blur(120px);
    opacity: 0.25;
    pointer-events: none;
    animation: float-nebula 20s infinite alternate ease-in-out;
}

body::before {
    background: radial-gradient(circle, var(--color-indigo) 0%, transparent 70%);
    top: -10%;
    left: -10%;
}

body::after {
    background: radial-gradient(circle, var(--color-magenta) 0%, transparent 70%);
    bottom: -10%;
    right: -10%;
    animation-delay: -10s;
}

@keyframes float-nebula {
    0% {
        transform: translate(0, 0) scale(1);
    }
    100% {
        transform: translate(10%, 10%) scale(1.2);
    }
}

/* Typography Extensions */
h1, h2, h3, h4, h5 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Header styling */
header {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 1.5rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.brand-icon {
    font-size: 2.25rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 12px rgba(6, 182, 212, 0.4));
}

.brand-text {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    font-size: 0.75rem;
    color: var(--color-cyan);
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-top: -0.25rem;
}

.server-badge {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--color-emerald);
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.server-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-emerald);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-emerald);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.6; }
}

/* Main Layout */
main {
    flex: 1;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem 3rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Glassmorphism Container */
.glass-panel {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    transition: var(--transition-smooth);
}

.intro-section {
    text-align: center;
    margin-bottom: 0.5rem;
}

.intro-section h2 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #ffffff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.intro-section p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Smart Dropzone Styling */
.dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    background: rgba(255, 255, 255, 0.01);
    position: relative;
    overflow: hidden;
}

.dropzone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(139, 92, 246, 0.08) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition-smooth);
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--color-indigo);
    background: rgba(139, 92, 246, 0.03);
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.15);
}

.dropzone:hover::before, .dropzone.dragover::before {
    opacity: 1;
}

.dropzone-icon {
    font-size: 3.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 8px rgba(6, 182, 212, 0.2));
    transition: var(--transition-smooth);
}

.dropzone:hover .dropzone-icon, .dropzone.dragover .dropzone-icon {
    transform: translateY(-5px) scale(1.05);
    filter: drop-shadow(0 0 15px rgba(139, 92, 246, 0.5));
}

.dropzone-text h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.dropzone-text p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Form inputs & buttons hidden */
.file-input {
    display: none;
}

/* File Selected / Options Styling */
.options-section {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    animation: fadeIn 0.4s ease-out;
}

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

.file-info-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.file-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    overflow: hidden;
}

.file-type-icon {
    font-size: 2rem;
    color: var(--color-indigo);
    width: 48px;
    height: 48px;
    background: rgba(139, 92, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-details {
    overflow: hidden;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

.btn-remove {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition-smooth);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove:hover {
    color: var(--color-magenta);
    background: rgba(236, 72, 153, 0.1);
}

/* Config Grid */
.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.config-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Modern Select / Input controls */
select, input[type="text"], input[type="number"] {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    outline: none;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    width: 100%;
}

select:focus, input[type="text"]:focus, input[type="number"]:focus {
    border-color: var(--color-indigo);
    background: rgba(139, 92, 246, 0.03);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.2);
}

select option {
    background: var(--bg-color);
    color: var(--text-primary);
}

/* Action button styling */
.action-container {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.btn-gradient {
    background: var(--gradient-primary);
    color: #ffffff;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 0.9rem 2.5rem;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    box-shadow: var(--gradient-glow);
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
}

.btn-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.25), transparent);
    transform: translateX(-100%);
    transition: 0.6s;
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(6, 182, 212, 0.4);
    background: var(--gradient-secondary);
}

.btn-gradient:hover::before {
    transform: translateX(100%);
}

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

/* Progress Overlay */
.progress-container {
    text-align: center;
    padding: 2.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    animation: fadeIn 0.3s ease-out;
}

.progress-ring-container {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring-circle {
    transition: stroke-dashoffset 0.35s;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    stroke: var(--color-indigo);
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
}

.progress-status {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* Result panel styling */
.result-section {
    text-align: center;
    padding: 2rem 1rem;
    animation: fadeIn 0.4s ease-out;
}

.success-icon {
    font-size: 4rem;
    background: var(--gradient-success);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 15px rgba(16, 185, 129, 0.3));
    animation: scaleUp 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes scaleUp {
    from { transform: scale(0.5); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.result-section h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.result-section p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    padding: 0.9rem 2rem;
    border-radius: 14px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-outline:hover {
    border-color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* PDF Merger section */
.merger-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1.5rem;
    animation: fadeIn 0.3s ease-out;
}

.merger-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.merger-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.merger-item-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    overflow: hidden;
}

.merger-item-icon {
    color: var(--color-indigo);
    font-size: 1.25rem;
}

.merger-item-name {
    font-size: 0.95rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.merger-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-arrow {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: var(--transition-smooth);
}

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

.btn-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.merger-item .btn-remove {
    width: 28px;
    height: 28px;
    font-size: 0.95rem;
}

.add-more-btn {
    border: 1px dashed rgba(255, 255, 255, 0.15);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 12px;
    padding: 0.85rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
}

.add-more-btn:hover {
    border-color: var(--color-indigo);
    color: var(--text-primary);
    background: rgba(139, 92, 246, 0.02);
}

/* Feature grid for landing screen */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 2rem;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(6, 182, 212, 0.25);
    background: rgba(6, 182, 212, 0.02);
    box-shadow: 0 10px 25px -10px rgba(6, 182, 212, 0.15);
}

.feature-icon-wrapper {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid rgba(139, 92, 246, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-cyan);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Canvas confetti container */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 100;
}

/* Footer Section */
footer {
    width: 100%;
    max-width: 1200px;
    margin: auto auto 0 auto;
    padding: 2rem 1.5rem;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Extra premium utilities */
.glow-text {
    text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

.badge-format {
    background: rgba(236, 72, 153, 0.1);
    border: 1px solid rgba(236, 72, 153, 0.2);
    color: var(--color-magenta);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

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

/* Responsive adjustments */
@media (max-width: 640px) {
    header {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
        padding-top: 1.5rem;
    }
    
    .glass-panel {
        padding: 1.5rem;
    }
    
    .intro-section h2 {
        font-size: 1.75rem;
    }
    
    .dropzone {
        padding: 2.5rem 1rem;
    }
    
    .btn-gradient, .btn-outline {
        width: 100%;
        justify-content: center;
    }
}