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

:root {
    --primary-gradient: linear-gradient(135deg, #000000 0%, #333333 50%, #666666 100%);
    --secondary-gradient: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #e9ecef 100%);
    --success-color: #28a745;
    --error-color: #dc3545;
    --text-primary: #000000;
    --text-secondary: #333333;
    --text-tertiary: #666666;
    --bg-card: rgba(255, 255, 255, 0.95);
    --border-card: rgba(0, 0, 0, 0.1);
    --border-card-hover: rgba(0, 0, 0, 0.2);
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(0, 0, 0, 0.15);
    --input-border-focus: rgba(0, 0, 0, 0.3);
    --shadow-sm: 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-glow: 0 0 15px rgba(0, 0, 0, 0.3);
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    --primary-gradient: linear-gradient(135deg, #1a237e 0%, #283593 50%, #3f51b5 100%);
    --secondary-gradient: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #21262d 100%);
    --text-primary: #ffffff;
    --text-secondary: #e6edf3;
    --text-tertiary: #7d8590;
    --bg-card: rgba(33, 38, 45, 0.95);
    --border-card: rgba(255, 255, 255, 0.1);
    --border-card-hover: rgba(255, 255, 255, 0.2);
    --input-bg: rgba(33, 38, 45, 0.9);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-border-focus: rgba(255, 255, 255, 0.3);
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 15px rgba(63, 81, 181, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--secondary-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.6;
    padding-top: 80px;
    transition: all var(--transition-normal);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-gradient);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(180deg);
    box-shadow: var(--shadow-glow);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Navbar Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-card);
    z-index: 1000;
    padding: 15px 0;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .navbar {
    background: rgba(33, 38, 45, 0.95);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    font-family: 'Poppins', sans-serif;
}

.navbar-brand i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.welcome-message {
    opacity: 0;
    transform: translateX(20px);
    transition: all var(--transition-normal);
    font-weight: 600;
    color: var(--text-secondary);
}

.welcome-message.visible {
    opacity: 1;
    transform: translateX(0);
}

.auth-buttons {
    display: flex;
    gap: 10px;
}

.auth-btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.auth-btn.primary {
    background: var(--primary-gradient);
    color: white;
}

.auth-btn.secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-card);
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.profile-container {
    display: none;
    position: relative;
}

.profile-button {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.profile-button:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.profile-button img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.profile-dropdown {
    position: absolute;
    top: 55px;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 250px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 1001;
}

.profile-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.profile-dropdown-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-card);
    display: flex;
    align-items: center;
    gap: 15px;
}

.profile-dropdown-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    overflow: hidden;
}

.profile-dropdown-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.profile-dropdown-info h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.profile-dropdown-info p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.profile-dropdown-menu {
    padding: 10px 0;
}

.profile-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-size: 0.95rem;
}

.profile-dropdown-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .profile-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.profile-dropdown-item.danger {
    color: var(--error-color);
}

.profile-dropdown-item.danger:hover {
    background: rgba(220, 53, 69, 0.1);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 450px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: all var(--transition-normal);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 25px 30px 20px;
    border-bottom: 1px solid var(--border-card);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 30px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.auth-form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.auth-form-input {
    padding: 15px;
    border: 2px solid var(--input-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: var(--input-bg);
    color: var(--text-primary);
}

.auth-form-input:focus {
    outline: none;
    border-color: var(--input-border-focus);
    background: var(--bg-card);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.auth-form-input.error {
    border-color: var(--error-color);
    background: rgba(220, 53, 69, 0.05);
}

.auth-form-error {
    color: var(--error-color);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 5px;
    opacity: 0;
    transform: translateY(-5px);
    transition: all var(--transition-fast);
}

.auth-form-error.show {
    opacity: 1;
    transform: translateY(0);
}

.auth-form-submit {
    padding: 15px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: 10px;
}

.auth-form-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.auth-form-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.auth-form-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-card);
}

.auth-form-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.auth-form-link:hover {
    color: var(--text-secondary);
}

.form-error-message {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.3);
    color: var(--error-color);
    padding: 12px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
}

.form-error-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* Avatar Upload Styles */
.avatar-upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.avatar-preview {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.8rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    overflow: hidden;
    border: 3px solid var(--border-card);
}

.avatar-preview:hover {
    transform: scale(1.05);
    border-color: var(--border-card-hover);
}

.avatar-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.avatar-upload-text {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    text-align: center;
}

.avatar-input {
    display: none;
}

/* Login Required Overlay */
.login-required-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-card);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: var(--radius-lg);
    text-align: center;
    padding: 40px 20px;
}

.login-required-icon {
    font-size: 4rem;
    color: var(--text-tertiary);
    margin-bottom: 20px;
    opacity: 0.5;
}

.login-required-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-family: 'Poppins', sans-serif;
}

.login-required-text {
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.login-required-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.login-required-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
}

.login-required-btn.primary {
    background: var(--primary-gradient);
    color: white;
}

.login-required-btn.secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-card);
}

.login-required-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* File Upload Styles */
.file-upload-container {
    margin-bottom: 20px;
    position: relative;
}

.file-upload-area {
    border: 2px dashed var(--input-border);
    border-radius: var(--radius-md);
    padding: 30px 20px;
    text-align: center;
    transition: all var(--transition-normal);
    background: var(--input-bg);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.file-upload-area:hover {
    border-color: var(--input-border-focus);
    background: var(--bg-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.file-upload-area.drag-over {
    border-color: var(--success-color);
    background: rgba(40, 167, 69, 0.05);
}

.file-upload-area.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .file-upload-area.disabled {
    background: rgba(255, 255, 255, 0.05);
}

.file-upload-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--text-tertiary);
}

.file-upload-text {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.file-upload-hint {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.file-upload-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-upload-input:disabled {
    cursor: not-allowed;
}

.file-preview {
    display: none;
    margin-top: 15px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    animation: fadeIn 0.3s ease-out;
}

[data-theme="dark"] .file-preview {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.file-preview.show {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.file-preview-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-preview-icon {
    font-size: 1.5rem;
    color: var(--text-tertiary);
}

.file-preview-details {
    display: flex;
    flex-direction: column;
}

.file-preview-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
    word-break: break-all;
}

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

.file-preview-remove {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color var(--transition-fast);
}

.file-preview-remove:hover {
    color: var(--error-color);
}

.file-upload-progress {
    display: none;
    margin-top: 15px;
}

.file-upload-progress.show {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.file-upload-progress-text {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.file-upload-progress-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

[data-theme="dark"] .file-upload-progress-bar-container {
    background: rgba(255, 255, 255, 0.1);
}

.file-upload-progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.or-divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.or-divider::before,
.or-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-card);
    margin: 0 10px;
}

/* Particle System */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    pointer-events: none;
    animation: float 6s infinite ease-in-out;
}

[data-theme="dark"] .particle {
    background: rgba(255, 255, 255, 0.1);
}

.particle:nth-child(odd) {
    background: rgba(0, 0, 0, 0.05);
    animation-delay: -2s;
}

[data-theme="dark"] .particle:nth-child(odd) {
    background: rgba(255, 255, 255, 0.05);
}

.particle:nth-child(3n) {
    background: rgba(0, 0, 0, 0.08);
    animation-delay: -4s;
}

[data-theme="dark"] .particle:nth-child(3n) {
    background: rgba(255, 255, 255, 0.08);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) translateX(0px) rotate(0deg);
        opacity: 0.1;
    }
    25% {
        transform: translateY(-20px) translateX(10px) rotate(90deg);
        opacity: 0.3;
    }
    50% {
        transform: translateY(-40px) translateX(-10px) rotate(180deg);
        opacity: 0.1;
    }
    75% {
        transform: translateY(-20px) translateX(15px) rotate(270deg);
        opacity: 0.2;
    }
}

.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.05;
}

.bg-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent 30%, rgba(0,0,0,0.02) 50%, transparent 70%);
    animation: sweep 8s infinite;
}

[data-theme="dark"] .bg-animation::before {
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.02) 50%, transparent 70%);
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: -1;
}

[data-theme="dark"] .bg-grid {
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
}

@keyframes sweep {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100vw) translateY(100vh) rotate(45deg); }
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--secondary-gradient);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    padding: 20px;
    min-height: 100vh;
    min-height: 100dvh;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 500px;
    width: 100%;
    margin: auto;
    padding: 40px 20px;
}

.loading-logo {
    font-size: clamp(2.5rem, 8vw, 4rem);
    margin-bottom: 1.5rem;
    animation: pulse 2s infinite;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    font-family: 'Poppins', sans-serif;
}

.loading-text {
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 600;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #000000 0%, #666666 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Poppins', sans-serif;
    line-height: 1.4;
}

[data-theme="dark"] .loading-text {
    background: linear-gradient(135deg, #ffffff 0%, #e6edf3 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-spinner {
    width: clamp(40px, 10vw, 60px);
    height: clamp(40px, 10vw, 60px);
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top: 4px solid #000000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

[data-theme="dark"] .loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top: 4px solid #ffffff;
}

.loading-progress {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 1rem;
}

[data-theme="dark"] .loading-progress {
    background: rgba(255, 255, 255, 0.1);
}

.loading-progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 2px;
    animation: loadingProgress 2s ease-in-out infinite;
}

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

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

@keyframes loadingProgress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.header {
    text-align: center;
    padding: 60px 20px 40px;
    position: relative;
}

.header h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 15px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
    font-family: 'Poppins', sans-serif;
    letter-spacing: -0.02em;
}

.header p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    animation: fadeInUp 1s ease-out 0.2s both;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

.instructions {
    background: var(--bg-card);
    border: 2px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin: 40px auto;
    max-width: 800px;
    box-shadow: var(--shadow-md);
    animation: fadeInUp 1s ease-out 0.4s both;
}

.instructions h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Poppins', sans-serif;
}

.instructions h3 i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.instruction-steps {
    list-style: none;
    counter-reset: step-counter;
}

.instruction-steps li {
    counter-increment: step-counter;
    margin-bottom: 15px;
    padding-left: 40px;
    position: relative;
    line-height: 1.6;
}

.instruction-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary-gradient);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
}

.instruction-highlight {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
    color: var(--text-primary);
}

[data-theme="dark"] .instruction-highlight {
    background: rgba(255, 255, 255, 0.05);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.input-section {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    backdrop-filter: blur(10px);
    animation: slideInLeft 0.8s ease-out;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    position: relative;
}

.input-section:hover {
    border-color: var(--border-card-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.section-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 25px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Poppins', sans-serif;
}

.section-title i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.form-group {
    margin-bottom: 25px;
}

.form-group.hidden {
    display: none;
}

.form-group.slide-down {
    animation: slideDown 0.3s ease-out;
}

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

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-normal);
    font-family: 'Inter', sans-serif;
}

.form-input:focus {
    outline: none;
    border-color: var(--input-border-focus);
    background: var(--bg-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

.form-input.error {
    border-color: var(--error-color);
    background: rgba(220, 53, 69, 0.1);
}

.form-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .form-input:disabled {
    background: rgba(255, 255, 255, 0.05);
}

.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
}

.category-option {
    position: relative;
}

.category-radio {
    display: none;
}

.category-label {
    display: block;
    padding: 20px 15px;
    background: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 600;
    font-size: 0.85rem;
    position: relative;
    overflow: hidden;
}

.category-label.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .category-label.disabled {
    background: rgba(255, 255, 255, 0.05);
}

.category-label::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,0,0,0.1), transparent);
    transition: left 0.5s;
}

[data-theme="dark"] .category-label::before {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}

.category-label:not(.disabled):hover {
    border-color: var(--border-card-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.category-label:not(.disabled):hover::before {
    left: 100%;
}

.category-radio:checked + .category-label:not(.disabled) {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

[data-theme="dark"] .category-radio:checked + .category-label:not(.disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.category-icon {
    font-size: 1.3rem;
    margin-bottom: 8px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-description {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    margin-top: 5px;
    line-height: 1.3;
}

.process-btn {
    width: 100%;
    padding: 18px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: var(--shadow-md);
    font-family: 'Inter', sans-serif;
}

.process-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

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

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

.process-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.process-btn:disabled:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

.result-section {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    backdrop-filter: blur(10px);
    animation: slideInRight 0.8s ease-out;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.result-section:hover {
    border-color: var(--border-card-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.result-placeholder {
    text-align: center;
    color: var(--text-tertiary);
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.result-placeholder .icon {
    font-size: 3rem;
    opacity: 0.3;
    animation: float 3s ease-in-out infinite;
}

.result-content {
    display: none;
}

.result-content.show {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

.result-item {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 15px;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .result-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.result-item:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

[data-theme="dark"] .result-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.result-label i {
    color: var(--text-secondary);
}

.result-value {
    color: var(--text-primary);
    font-weight: 600;
    word-break: break-all;
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.result-link {
    display: inline-flex;
    align-items: center;
    color: white;
    text-decoration: none;
    font-weight: 600;
    padding: 12px 18px;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    gap: 8px;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
    flex: 1;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.result-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.result-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.result-link:hover::before {
    left: 100%;
}

.copy-btn {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
    padding: 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    min-width: 120px;
}

[data-theme="dark"] .copy-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.copy-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .copy-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.copy-btn.copied {
    background: rgba(40, 167, 69, 0.2);
    border-color: rgba(40, 167, 69, 0.5);
    color: var(--success-color);
}

.hidden-input {
    position: absolute;
    left: -9999px;
    opacity: 0;
}

.loading {
    display: none;
    align-items: center;
    justify-content: center;
    padding: 40px;
    flex-direction: column;
    gap: 15px;
}

.loading.show {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top: 3px solid #000000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

[data-theme="dark"] .spinner {
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #ffffff;
}

.loading-text {
    color: var(--text-secondary);
    font-size: 1rem;
    text-align: center;
}

.progress-container {
    width: 100%;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 15px;
}

[data-theme="dark"] .progress-container {
    background: rgba(255, 255, 255, 0.1);
}

.progress-bar {
    height: 6px;
    background: var(--primary-gradient);
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

.success-state {
    background: rgba(40, 167, 69, 0.1);
    border-color: rgba(40, 167, 69, 0.3);
}

.success-state .result-label i {
    color: var(--success-color);
}

.error-state {
    background: rgba(220, 53, 69, 0.1);
    border-color: rgba(220, 53, 69, 0.3);
}

.error-state .result-label i {
    color: var(--error-color);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: rgba(0, 0, 0, 0.9);
    color: white;
    text-align: center;
    border-radius: var(--radius-sm);
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.8rem;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .tooltip .tooltiptext {
    background-color: rgba(255, 255, 255, 0.9);
    color: black;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: 15px 20px;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    z-index: 10000;
    animation: slideInRight 0.3s ease-out;
    max-width: 300px;
    word-wrap: break-word;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
}

.notification.success {
    background: linear-gradient(135deg, #28a745, #20c997);
}

.notification.error {
    background: linear-gradient(135deg, #dc3545, #e74c3c);
}

.notification-icon {
    font-size: 1.2rem;
}

.notification-message {
    flex: 1;
}

.notification-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.notification-close:hover {
    opacity: 1;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 70px;
    }

    .theme-toggle {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
        bottom: 15px;
        right: 15px;
    }

    .navbar {
        padding: 10px 0;
    }

    .navbar-container {
        padding: 0 15px;
    }

    .navbar-brand {
        font-size: 1.2rem;
    }

    .welcome-message {
        display: none;
    }

    .auth-buttons {
        gap: 5px;
    }

    .auth-btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .profile-button {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .profile-dropdown {
        right: -10px;
        min-width: 220px;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }

    .modal-header {
        padding: 20px 25px 15px;
    }

    .modal-body {
        padding: 25px;
    }

    .header {
        padding: 40px 15px 30px;
    }
    
    .main-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .input-section,
    .result-section {
        padding: 20px;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-label {
        padding: 15px 10px;
    }
    
    .container {
        padding: 0 15px;
    }

    .result-actions {
        flex-direction: column;
    }

    .instructions {
        margin: 20px;
        padding: 20px;
    }

    .instruction-steps li {
        padding-left: 35px;
    }

    .instruction-steps li::before {
        width: 22px;
        height: 22px;
        font-size: 0.75rem;
    }

    .login-required-buttons {
        flex-direction: column;
        width: 100%;
    }

    .login-required-btn {
        width: 100%;
        justify-content: center;
    }

    .loading-content {
        padding: 20px 15px;
    }

    .notification {
        top: 80px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
}
    /* Add styles for upload notifications */
.upload-success-notification,
.manual-upload-notification {
  background: var(--bg-card);
  border: 2px solid var(--success-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin: 15px 0;
  animation: slideDown 0.3s ease-out;
  position: relative;
}

.manual-upload-notification {
  border-color: #17a2b8;
}

.upload-success-content,
.manual-upload-content {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.upload-success-header,
.manual-upload-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.1rem;
}

.upload-success-url {
  display: flex;
  gap: 10px;
  align-items: center;
}

.catbox-url-display {
  flex: 1;
  padding: 10px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
  color: var(--text-primary);
  font-family: monospace;
  font-size: 0.9rem;
}

.copy-catbox-btn {
  padding: 10px 15px;
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 5px;
}

.copy-catbox-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.upload-success-note {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 10px;
  background: rgba(40, 167, 69, 0.1);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--success-color);
}

.close-success-btn,
.close-manual-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 1.2rem;
  transition: color var(--transition-fast);
}

.close-success-btn:hover,
.close-manual-btn:hover {
  color: var(--text-primary);
}

.manual-upload-instructions {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.manual-upload-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.manual-upload-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 10px 15px;
  background: var(--input-bg);
  border: 2px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-normal);
}

.manual-upload-link:hover {
  border-color: var(--input-border-focus);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

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

/* Mobile responsive for upload notifications */
@media (max-width: 768px) {
  .upload-success-url {
    flex-direction: column;
  }

  .copy-catbox-btn {
    width: 100%;
    justify-content: center;
  }

  .manual-upload-links {
    flex-direction: column;
  }

  .manual-upload-link {
    justify-content: center;
  }
}


@media (max-width: 480px) {
    .navbar-brand {
        font-size: 1rem;
    }

    .auth-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    .profile-button {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }

    .modal-content {
        width: 100%;
        margin: 10px;
        border-radius: var(--radius-md);
    }

    .theme-toggle {
        width: 45px;
        height: 45px;
        font-size: 1rem;
        bottom: 10px;
        right: 10px;
    }

    .loading-content {
        padding: 15px 10px;
    }
}

@media (max-height: 600px) {
    .loading-content {
        padding: 20px 15px;
    }
    
    .loading-logo {
        font-size: clamp(2rem, 6vw, 3rem);
        margin-bottom: 1rem;
    }
    
    .loading-text {
        font-size: clamp(0.9rem, 3vw, 1.2rem);
        margin-bottom: 1.5rem;
    }
}