Frontend/styles.css

/* CSS Variables for consistent theming */
:root {
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --blue-50: #eef2ff;
    --green-50: #f0fdf4;
    --green-200: #bbf7d0;
    --green-600: #16a34a;
    --green-700: #15803d;
    --text: #0f172a;
    --muted: #475569;
    --border: #e5e7eb;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-900: #111827;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius: 14px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --max-width: 1100px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', system-ui, sans-serif;
    background-color: var(--white);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    scroll-behavior: smooth;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--white) 0%, var(--blue-50) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, var(--blue-50) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--blue-50) 0%, transparent 50%);
    opacity: 0.5;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 2rem 0;
}

.hero-logo {
    font-size: 4rem;
    font-weight: 800;
    color: var(--blue-600);
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--muted);
    margin-bottom: 2.5rem;
    line-height: 1.5;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    min-height: 44px;
    position: relative;
    overflow: hidden;
}

.btn:focus-visible {
    outline: 2px solid var(--blue-600);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--blue-600);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--blue-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: var(--gray-50);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
    min-height: 52px;
    border-radius: var(--radius);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn.loading {
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    top: 50%;
    left: 50%;
    margin-left: -0.625rem;
    margin-top: -0.625rem;
    border: 2px solid currentColor;
    border-radius: 50%;
    border-right-color: transparent;
    animation: spin 0.8s linear infinite;
    color: var(--white);
}

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

/* Wizard Section */
.wizard-section {
    min-height: 100vh;
    padding: 2rem 0;
    background-color: var(--gray-50);
}

/* Progress Container */
.progress-container {
    background-color: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.progress-container.sticky {
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.progress-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: var(--transition);
}

.progress-step.active,
.progress-step.completed {
    opacity: 1;
}

.step-indicator {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background-color: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--muted);
    transition: var(--transition);
    position: relative;
}

.progress-step.active .step-indicator {
    background-color: var(--blue-600);
    color: var(--white);
}

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

.step-number {
    transition: var(--transition);
}

.step-check {
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    color: var(--white);
}

.step-check.hidden {
    display: none;
}

.progress-step.completed .step-number {
    display: none;
}

.progress-step.completed .step-check {
    display: block;
}

.step-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted);
    text-align: center;
}

.progress-step.active .step-label,
.progress-step.completed .step-label {
    color: var(--text);
}

/* Wizard Steps */
.wizard-step {
    opacity: 0;
    transform: translateY(2rem);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.wizard-step.active {
    opacity: 1;
    transform: translateY(0);
}

.wizard-step.hidden {
    display: none;
}

.step-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    max-width: 800px;
    margin: 0 auto;
}

.step-header {
    text-align: center;
    margin-bottom: 2rem;
}

.step-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.step-description {
    font-size: 1.125rem;
    color: var(--muted);
    line-height: 1.5;
}

.step-content {
    margin-bottom: 2rem;
}

.step-footer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.footer-note {
    font-size: 0.875rem;
    color: var(--muted);
    text-align: center;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-select,
.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    background-color: var(--white);
    transition: var(--transition);
    font-family: inherit;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: var(--blue-600);
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.form-select:disabled,
.form-input:disabled {
    background-color: var(--gray-50);
    color: var(--muted);
    cursor: not-allowed;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
}

.file-input-wrapper {
    display: flex;
    gap: 0.75rem;
    align-items: stretch;
}

.file-input-wrapper .form-input {
    flex: 1;
}

.file-picker-btn {
    white-space: nowrap;
    flex-shrink: 0;
}

/* Split Ratios */
.split-ratios {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.split-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.split-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.validation-text {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    font-weight: 500;
}

.validation-text.error {
    color: var(--error);
}

.validation-text.success {
    color: var(--success);
}

/* Info Note */
.info-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--blue-50);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--blue-600);
    font-size: 0.875rem;
    color: var(--text);
    margin-top: 1rem;
}

.info-note.hidden {
    display: none;
}

.info-icon {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--blue-600);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

/* Actions */
.actions-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 2rem;
}

.final-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

/* Validation Checks */
.validation-checks {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.check-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background-color: var(--white);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.check-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
}

.check-success {
    color: var(--success);
}

.check-warning {
    color: var(--warning);
}

.check-error {
    color: var(--error);
}

/* Preview Panels */
.preview-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
    margin: 2rem 0;
}

.preview-panel {
    background-color: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.panel-title {
    padding: 1rem 1.5rem;
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--border);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.code-block {
    background-color: var(--gray-900);
    color: #e5e7eb;
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    margin: 0;
    min-height: 200px;
}

.code-block code {
    color: inherit;
    font-family: inherit;
}

.command-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.command-section code {
    display: block;
    color: #10b981;
    font-weight: 500;
}

.command-comment {
    color: #9ca3af;
    font-style: italic;
    font-size: 0.8125rem;
}

.command-separator {
    height: 1px;
    background-color: #374151;
    margin: 0.75rem 0;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background-color: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 0.3s ease-out;
    font-size: 0.875rem;
}

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

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

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

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

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

/* Responsive design */
@media (min-width: 900px) {
    .preview-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .progress-bar {
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .hero-logo {
        font-size: 3rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .step-card {
        padding: 1.5rem;
    }
    
    .step-title {
        font-size: 1.5rem;
    }
    
    .step-description {
        font-size: 1rem;
    }
    
    .actions-row,
    .final-actions {
        flex-direction: column;
    }
    
    .progress-bar {
        gap: 1rem;
    }
    
    .step-label {
        font-size: 0.6875rem;
    }
    
    .split-ratios {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .step-card {
        padding: 1.25rem;
    }
    
    .toast {
        min-width: auto;
        margin: 0 0.5rem;
    }
    
    .hero-content {
        padding: 1rem 0;
    }
    
    .progress-bar {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding: 0 1rem;
        gap: 1.5rem;
    }
    
    .progress-step {
        flex-shrink: 0;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --muted: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    body {
        scroll-behavior: auto;
    }
}

/* Focus improvements for accessibility */
.btn:focus-visible,
.form-select:focus-visible,
.form-input:focus-visible {
    outline: 2px solid var(--blue-600);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Loading state improvements */
.step-card.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Smooth transitions for progressive disclosure */
.wizard-step {
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced visual hierarchy */
.step-header::after {
    content: '';
    width: 60px;
    height: 2px;
    background-color: var(--blue-600);
    display: block;
    margin: 1rem auto 0;
    border-radius: 1px;
}

/* Basic/Advanced mode styling */
.hidden {
    display: none !important;
}

.advanced-badge {
    display: inline-block;
    background-color: var(--blue-50);
    color: var(--blue-700);
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    margin-left: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-hint {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 0.25rem;
    display: block;
}

.mode-indicator {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--blue-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--blue-700);
    margin-left: 0.5rem;
}

.mode-indicator.basic {
    background-color: var(--green-50);
    color: var(--green-700);
    border-color: var(--green-200);
}

.setup-mode {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 12px 0 8px;
    padding: 1rem;
    background-color: var(--gray-50);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.setup-mode label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.setup-mode input[type="radio"] {
    margin: 0;
}

.setup-mode .hint {
    font-size: 0.9rem;
    opacity: 0.8;
    color: var(--muted);
    margin-left: auto;
}

.btn-success:hover {
    background-color: var(--green-600);
    border-color: var(--green-600);
}

/* Tab Interface */
.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--border);
    margin-bottom: 2rem;
    gap: 0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--muted);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    position: relative;
}

.tab-btn:hover {
    color: var(--text);
    background-color: var(--gray-50);
}

.tab-btn.active {
    color: var(--blue-600);
    border-bottom-color: var(--blue-600);
    background-color: var(--blue-50);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.basic-intro {
    padding: 1.5rem;
    background-color: var(--blue-50);
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--blue-600);
}

.basic-description {
    margin: 0;
    color: var(--blue-700);
    font-weight: 500;
}

.basic-footer {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--green-50);
    border-radius: var(--radius-sm);
    text-align: center;
    border-left: 4px solid var(--green-600);
}

.basic-note {
    margin: 0 0 1rem 0;
    color: var(--green-700);
    font-size: 0.9rem;
}

#basic-start-training {
    font-size: 1.1rem;
    padding: 0.75rem 2rem;
    font-weight: 600;
}

.mode-indicator.basic {
    background-color: var(--success);
    border-color: var(--success);
    color: var(--white);
}

/* File input enhancements */
.file-input-wrapper {
    position: relative;
}

.file-input-wrapper input[readonly] {
    cursor: pointer;
    background-color: var(--gray-50);
}

.file-input-wrapper input[readonly]:focus {
    background-color: var(--white);
}