:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1a1a2e;
    --dark-light: #16213e;
    --gray: #6b7280;
    --gray-light: #e5e7eb;
    --white: #ffffff;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Particles Background */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Auth Page Styles */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 480px;
    animation: fadeInUp 0.6s ease-out;
}

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

.auth-card {
    background: var(--white);
    border-radius: 24px;
    padding: 48px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.logo-section {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    display: inline-block;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

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

.app-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.app-subtitle {
    color: var(--gray);
    font-size: 15px;
}

.tab-container {
    margin-bottom: 32px;
}

.tabs {
    display: flex;
    gap: 8px;
    background: var(--gray-light);
    padding: 4px;
    border-radius: var(--radius);
    margin-bottom: 32px;
}

.tab {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: var(--gray);
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.tab.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.auth-form {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.auth-form.active {
    display: block;
}

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

.form-group {
    margin-bottom: 24px;
}

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

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox span {
    font-size: 14px;
    color: var(--gray);
}

.link {
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.link:hover {
    color: var(--primary-dark);
}

.btn-primary {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

.divider {
    text-align: center;
    margin: 32px 0;
    position: relative;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-light);
}

.divider span {
    position: relative;
    background: var(--white);
    padding: 0 16px;
    color: var(--gray);
    font-size: 14px;
}

.social-auth {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-social {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--gray-light);
    background: var(--white);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.btn-social:hover {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

/* App Page Styles */
.app-page {
    background: #f8f9fa;
}

.navbar {
    background: var(--white);
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-small {
    width: 32px;
    height: 32px;
}

.brand-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.credits-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
}

.user-menu {
    position: relative;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.user-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 280px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

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

.dropdown-header {
    padding: 16px;
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.user-info strong {
    color: var(--dark);
    font-size: 15px;
}

.user-info span {
    color: var(--gray);
    font-size: 13px;
}

.dropdown-divider {
    height: 1px;
    background: var(--gray-light);
    margin: 8px 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: rgba(102, 126, 234, 0.05);
    color: var(--primary);
}

.app-container {
    display: flex;
    height: calc(100vh - 72px);
}

.sidebar {
    width: 280px;
    background: var(--white);
    padding: 24px 16px;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--gray);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.sidebar-btn:hover {
    background: rgba(102, 126, 234, 0.05);
    color: var(--primary);
}

.sidebar-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
}

.sidebar-btn .badge {
    margin-left: auto;
    padding: 2px 8px;
    background: var(--danger);
    color: var(--white);
    border-radius: 10px;
    font-size: 12px;
}

.sidebar-divider {
    height: 1px;
    background: var(--gray-light);
    margin: 16px 0;
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.view-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark);
}

.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 600px;
}

.upload-area {
    width: 100%;
    max-width: 600px;
    padding: 80px 40px;
    background: var(--white);
    border: 3px dashed var(--gray-light);
    border-radius: var(--radius);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

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

.upload-area svg {
    color: var(--primary);
    margin-bottom: 24px;
}

.upload-area h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.upload-area p {
    color: var(--gray);
    font-size: 16px;
    margin-bottom: 16px;
}

.upload-formats {
    color: var(--gray);
    font-size: 14px;
}

.editor-section {
    max-width: 1400px;
    margin: 0 auto;
}

.editor-toolbar {
    background: var(--white);
    padding: 20px 24px;
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-icon {
    width: 40px;
    height: 40px;
    background: transparent;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-sm);
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

.toolbar-divider {
    width: 1px;
    height: 32px;
    background: var(--gray-light);
}

.btn-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-sm);
    color: var(--gray);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-toggle.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: transparent;
    color: var(--white);
}

.btn-secondary {
    padding: 10px 20px;
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-sm);
    color: var(--gray);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.canvas-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 24px;
}

.canvas-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.canvas-wrapper canvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.canvas-label {
    margin-top: 16px;
    font-weight: 600;
    color: var(--gray);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.canvas-divider {
    width: 1px;
    background: var(--gray-light);
}

.processing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 60px;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.processing-overlay.active {
    opacity: 1;
    visibility: visible;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--gray-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

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

.processing-overlay p {
    color: var(--gray);
    font-weight: 600;
    margin-bottom: 16px;
}

.progress-bar {
    width: 200px;
    height: 4px;
    background: var(--gray-light);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    width: 0%;
    transition: width 0.3s ease;
}

.editor-controls {
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.control-group {
    margin-bottom: 24px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-group label {
    display: block;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
    font-size: 14px;
}

.background-options {
    display: flex;
    gap: 12px;
}

.bg-option {
    flex: 1;
    padding: 16px;
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.bg-option:hover {
    border-color: var(--primary);
}

.bg-option.active {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

.bg-preview {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--gray-light);
}

.bg-preview.transparent {
    background:
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

.bg-preview.white {
    background: var(--white);
}

.bg-option span {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray);
}

.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-light);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.history-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    cursor: pointer;
}

.history-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.history-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.history-card-info {
    padding: 16px;
}

.history-card-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 4px;
}

.history-card-info p {
    font-size: 13px;
    color: var(--gray);
}

.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.template-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    cursor: pointer;
}

.template-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.template-preview {
    width: 120px;
    height: 120px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.template-icon {
    font-size: 48px;
}

.template-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.template-card p {
    color: var(--gray);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 1024px) {
    .canvas-container {
        grid-template-columns: 1fr;
    }

    .canvas-divider {
        display: none;
    }

    .sidebar {
        width: 80px;
    }

    .sidebar-btn span {
        display: none;
    }
}

@media (max-width: 768px) {
    .auth-card {
        padding: 32px 24px;
    }

    .navbar {
        padding: 12px 16px;
    }

    .main-content {
        padding: 16px;
    }

    .sidebar {
        display: none;
    }
}