/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Professional Medical/Academic Color Palette */
    --color-primary: #1e3a5f;
    --color-primary-dark: #0f2847;
    --color-primary-light: #2d5a8a;
    --color-accent: #3b82f6;
    --color-accent-light: #60a5fa;

    --color-bg: #fafbfc;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;

    --color-text-primary: #1a202c;
    --color-text-secondary: #64748b;
    --color-text-tertiary: #94a3b8;

    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --color-success: #059669;
    --color-error: #dc2626;
    --color-warning: #d97706;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.05);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Typography */
    --font-display: 'Crimson Pro', Georgia, serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Header
   ======================================== */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xl);
}

.header-left {
    flex: 1;
}

.title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}

.header-right {
    flex-shrink: 0;
}

/* Switchers Row */
.switchers-row {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.lang-btn {
    background: transparent;
    border: none;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
    font-family: var(--font-body);
}

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

.lang-btn.active {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-divider {
    color: var(--color-border);
    font-size: 0.875rem;
}

/* Version Switcher */
.version-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.version-btn {
    background: transparent;
    border: none;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
    font-family: var(--font-mono);
}

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

.version-btn.active {
    color: var(--color-primary);
    font-weight: 600;
}

.version-divider {
    color: var(--color-border);
    font-size: 0.875rem;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.subsection-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
    font-family: var(--font-body);
}

/* ========================================
   Input Container
   ======================================== */
.input-container {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
    margin-bottom: var(--space-md);
}

.findings-textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    resize: vertical;
    transition: all var(--transition-normal);
    margin-bottom: var(--space-md);
}

.findings-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.findings-textarea::placeholder {
    color: var(--color-text-tertiary);
}

/* Validation Error */
.validation-error {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-md);
    color: var(--color-error);
    font-size: 0.8125rem;
    margin-bottom: var(--space-md);
}

.error-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Analyze Button */
.analyze-btn {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-body);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.analyze-btn:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.analyze-btn:active:not(:disabled) {
    transform: translateY(0);
}

.analyze-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.analyze-btn.loading {
    background: var(--color-primary-light);
}

.loading-text {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.spinner {
    width: 18px;
    height: 18px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
        stroke-dashoffset: 31.416;
    }
    to {
        transform: rotate(360deg);
        stroke-dashoffset: 0;
    }
}

/* ========================================
   Compact Examples Grid
   ======================================== */
.examples-container.compact {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    margin-bottom: var(--space-md);
}

.examples-container.compact .section-header {
    margin-bottom: var(--space-sm);
}

.examples-container.compact .section-title {
    font-size: 1rem;
}

.examples-grid.compact {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.example-chip {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
    white-space: nowrap;
}

.example-chip:hover {
    border-color: var(--color-accent-light);
    color: var(--color-primary);
    background: #f0f7ff;
}

.example-chip.selected {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

/* ========================================
   Evaluation Container
   ======================================== */
.evaluation-container {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
    animation: fadeIn 0.3s ease;
}

.evaluation-step {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    border: 2px solid var(--color-border-light);
    transition: all var(--transition-normal);
}

.evaluation-step.active {
    border-color: var(--color-accent);
    background: #f8fafc;
}

.evaluation-step.completed {
    border-color: var(--color-success);
    background: #f0fdf4;
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.step-number {
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.evaluation-step.completed .step-number {
    background: var(--color-success);
}

.step-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.step-check {
    margin-left: auto;
    color: var(--color-success);
}

.step-check svg {
    width: 20px;
    height: 20px;
}

/* Classification Inputs */
.classification-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.classification-summary {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: var(--space-sm) 0;
}

.classification-summary .separator {
    color: var(--color-border);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

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

.input-group select {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.input-group select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Usefulness Inputs */
.usefulness-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.rating-buttons {
    display: flex;
    gap: var(--space-xs);
}

.rating-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.rating-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.rating-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

/* Submit Buttons */
.submit-step-btn {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
    margin-bottom: var(--space-md);
}

.submit-step-btn:hover:not(:disabled) {
    background: var(--color-accent-light);
    transform: translateY(-1px);
}

.submit-step-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-final-btn {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-success);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.submit-final-btn:hover:not(:disabled) {
    background: #047857;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.submit-final-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Submission Success */
.submission-success {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-radius: var(--radius-md);
    color: var(--color-success);
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: var(--space-md);
    animation: fadeIn 0.3s ease;
}

.submission-success svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   Results Section
   ======================================== */
.results-section {
    position: sticky;
    top: 100px;
}

.results-container {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border-light);
    min-height: 300px;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
    color: var(--color-text-tertiary);
}

.empty-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.875rem;
}

/* Results Content */
.results-content {
    animation: fadeIn 0.3s ease;
}

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

/* Classification Grid */
.classification-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.classification-card {
    background: linear-gradient(135deg, var(--color-bg) 0%, white 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.classification-card.left {
    border-top: 3px solid var(--color-accent);
}

.classification-card.right {
    border-top: 3px solid var(--color-primary);
}

.card-header {
    margin-bottom: var(--space-sm);
}

.card-label {
    display: block;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}

.card-sublabel {
    display: block;
    font-size: 0.625rem;
    color: var(--color-text-tertiary);
    margin-top: 2px;
}

.card-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* Reasoning Section */
.reasoning-section {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    border: 1px solid var(--color-border-light);
}

.reasoning-content {
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--color-text-primary);
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
}

/* Raw Output Section */
.raw-output-section {
    border-top: 1px solid var(--color-border-light);
    padding-top: var(--space-md);
}

.raw-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.raw-toggle:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-primary);
}

.toggle-icon {
    width: 14px;
    height: 14px;
}

.chevron {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-normal);
}

.chevron.expanded {
    transform: rotate(180deg);
}

.raw-output-content {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: #1e293b;
    border-radius: var(--radius-md);
    overflow: auto;
    max-height: 300px;
}

.raw-output-content pre {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    line-height: 1.5;
    color: #e2e8f0;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    text-align: center;
    padding: var(--space-xl) var(--space-xl);
    border-top: 1px solid var(--color-border-light);
    margin-top: var(--space-xl);
}

.footer p {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .title {
        font-size: 1.375rem;
    }

    .main-content {
        padding: var(--space-md);
        gap: var(--space-md);
    }

    .examples-grid.compact {
        justify-content: center;
    }

    .classification-inputs,
    .usefulness-inputs {
        grid-template-columns: 1fr;
    }

    .classification-grid {
        grid-template-columns: 1fr;
    }

    .results-section {
        position: static;
    }
}