/* ============================================
   DermaCheck AI - Professional Medical Interface
   Modern, Clean, Medical-Grade Design
   ============================================ */

:root {
    /* Primary Colors - Medical Blue */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;

    /* Danger Colors */
    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --danger-700: #b91c1c;

    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Playfair Display', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 50%, #cbd5e1 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
    padding: 0;
}

/* ============================================
   App Container
   ============================================ */

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Header
   ============================================ */

.app-header {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.2;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 1;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
    line-height: 1.2;
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.brand-subtitle {
    font-size: 1rem;
    opacity: 1;
    margin-top: 0.5rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    opacity: 0.9;
    white-space: nowrap;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
    opacity: 1;
    transform: translateY(-1px);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.25);
    opacity: 1;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
    white-space: nowrap;
}

/* ============================================
   Main Content
   ============================================ */

.app-main {
    flex: 1;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

/* ============================================
   Section Headers
   ============================================ */

.section-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.section-title i {
    color: var(--primary-600);
    font-size: 1.75rem;
}

.section-description {
    font-size: 1rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Upload Instructions
   ============================================ */

.upload-instructions {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.instructions-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.instructions-header i {
    font-size: 1.5rem;
    color: var(--primary-600);
}

.instructions-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
}

.instructions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.instruction-item {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    border: 2px solid var(--gray-200);
}

.instruction-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.instruction-icon.good {
    background: var(--success-100);
    color: var(--success-600);
}

.instruction-icon.bad {
    background: var(--danger-100);
    color: var(--danger-600);
}

.instruction-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.instruction-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.instruction-content ul li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--gray-700);
    line-height: 1.6;
    font-size: 0.9375rem;
}

.instruction-content ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--gray-400);
    font-weight: bold;
    font-size: 1.25rem;
}

.instructions-note {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-500);
    color: var(--primary-700);
    font-size: 0.9375rem;
}

.instructions-note i {
    color: var(--primary-600);
    margin-top: 0.2rem;
    flex-shrink: 0;
}

.instructions-note strong {
    color: var(--primary-800);
}

/* ============================================
   Upload Section
   ============================================ */

.upload-section {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Sample Images Section */
.sample-images-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    border: 2px dashed var(--color-primary);
}

.sample-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.sample-header i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.sample-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.sample-header p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.sample-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.sample-btn {
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.sample-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.sample-btn:hover::before {
    left: 100%;
}

.sample-btn i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.sample-btn span {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.sample-btn small {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 400;
}

.benign-btn {
    border-color: var(--color-success);
}

.benign-btn i {
    color: var(--color-success);
}

.benign-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(40, 167, 69, 0.2);
    border-color: var(--color-success);
    background: linear-gradient(135deg, #ffffff 0%, #e8f5e9 100%);
}

.malignant-btn {
    border-color: var(--color-danger);
}

.malignant-btn i {
    color: var(--color-danger);
}

.malignant-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(220, 53, 69, 0.2);
    border-color: var(--color-danger);
    background: linear-gradient(135deg, #ffffff 0%, #ffebee 100%);
}

.sample-btn:active {
    transform: translateY(-2px);
}

.sample-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.sample-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

.sample-note {
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    justify-content: center;
}

.sample-note i {
    color: var(--color-primary);
    font-size: 1.2rem;
}

.upload-area {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.upload-zone {
    border: 3px dashed var(--gray-300);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--gray-50);
    position: relative;
    overflow: hidden;
    min-height: 400px;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s;
}

.upload-zone:hover::before {
    left: 100%;
}

.upload-zone:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.upload-zone.dragover {
    border-color: var(--primary-600);
    background: var(--primary-100);
    transform: scale(1.02);
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    box-shadow: var(--shadow-lg);
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.upload-subtitle {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.upload-button-wrapper {
    margin: var(--spacing-lg) 0;
}

input[type="file"] {
    display: none;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.upload-hint i {
    color: var(--primary-500);
}

/* ============================================
   Buttons
   ============================================ */

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
}

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

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--primary-500);
    color: var(--primary-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   Features Grid
   ============================================ */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.feature-item {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    }

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    font-size: 1.5rem;
}

.feature-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
}

/* ============================================
   Results Section
   ============================================ */

.results-section {
    animation: fadeInUp 0.6s ease-out;
}

.results-header {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.results-title-group {
    flex: 1;
}

.results-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.results-subtitle {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.diagnosis-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.diagnosis-badge-malignant {
    background: linear-gradient(135deg, var(--danger-100), var(--danger-50));
    color: var(--danger-700);
    border: 2px solid var(--danger-300);
}

.diagnosis-badge-benign {
    background: linear-gradient(135deg, var(--success-100), var(--success-50));
    color: var(--success-700);
    border: 2px solid var(--success-300);
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.badge-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.8;
}

.badge-value {
    font-size: 1.125rem;
}

/* ============================================
   Results Content
   ============================================ */

.results-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* ============================================
   Images Comparison
   ============================================ */

.images-comparison {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
}

.comparison-header {
    margin-bottom: var(--spacing-lg);
}

.comparison-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.comparison-title i {
    color: var(--primary-600);
}

.images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.image-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
}

.image-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-300);
}

.image-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border-bottom: 1px solid var(--gray-200);
}

.image-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.image-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    background: var(--gray-200);
    color: var(--gray-700);
}

.image-badge.processed {
    background: var(--primary-100);
    color: var(--primary-700);
}

.image-container {
    padding: var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--gray-100);
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.processing-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    color: var(--primary-700);
    font-size: 0.875rem;
    font-weight: 500;
}

.processing-note i {
    color: var(--primary-600);
}

/* ============================================
   Metrics Section
   ============================================ */

.metrics-section {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.metric-card {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-300);
    background: white;
}

.metric-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.metric-icon-wrapper {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    font-size: 1.25rem;
}

.metric-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.metric-value-display {
    margin: var(--spacing-lg) 0;
}

.metric-description {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: var(--spacing-md);
}

/* ============================================
   Circular Progress
   ============================================ */

.circular-progress {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto;
}

.progress-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-ring-circle-bg {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 8;
}

.progress-ring-circle {
    fill: none;
    stroke: var(--primary-600);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease-out;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.progress-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

/* ============================================
   Color Analysis
   ============================================ */

.color-analysis {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.color-swatch-large {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    border: 4px solid var(--gray-300);
    box-shadow: var(--shadow-md);
}

.color-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.color-hex {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
}

.color-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ============================================
   Confidence Section
   ============================================ */

.confidence-section {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
}

.confidence-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.confidence-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.confidence-title-group {
    flex: 1;
}

.confidence-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.confidence-title i {
    color: var(--primary-600);
}

.confidence-subtitle {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.confidence-percentage {
    text-align: right;
}

.confidence-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.confidence-bar-wrapper {
    width: 100%;
}

.confidence-bar {
    width: 100%;
    height: 16px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.confidence-fill {
    height: 100%;
    border-radius: var(--radius-full);
    position: relative;
    transition: width 1s ease-out;
    overflow: hidden;
}

.confidence-bar.malignant .confidence-fill {
    background: linear-gradient(90deg, var(--danger-500), var(--danger-600));
}

.confidence-bar.benign .confidence-fill {
    background: linear-gradient(90deg, var(--success-500), var(--success-600));
}

.confidence-shimmer {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

/* ============================================
   Medical Notice
   ============================================ */

.medical-notice {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
}

.notice-card {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    border-left: 4px solid;
}

.notice-critical {
    background: var(--danger-50);
    border-color: var(--danger-600);
}

.notice-informational {
    background: var(--primary-50);
    border-color: var(--primary-600);
}

.notice-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.notice-critical .notice-icon {
    color: var(--danger-600);
}

.notice-informational .notice-icon {
    color: var(--primary-600);
}

.notice-content {
    flex: 1;
}

.notice-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.notice-text {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.notice-text strong {
    color: var(--gray-900);
    font-weight: 600;
}

.notice-actions {
    margin-top: var(--spacing-md);
}

.notice-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-600);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.notice-link:hover {
    color: var(--primary-700);
    text-decoration: underline;
}

/* ============================================
   Action Buttons
   ============================================ */

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */

.app-footer {
    background: var(--gray-900);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-disclaimer {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-500);
}

.footer-disclaimer i {
    color: var(--primary-400);
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.disclaimer-text {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--gray-300);
}

.disclaimer-text strong {
    color: white;
    font-weight: 600;
}

.footer-meta {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-text {
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* ============================================
   Loading States
   ============================================ */

.upload-form.loading .upload-zone {
    pointer-events: none;
}

.upload-form.loading .upload-content {
    opacity: 0.3;
    transition: opacity 0.3s ease;
    }

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
}

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

.loading-content {
    width: 100%;
    max-width: 500px;
    padding: var(--spacing-xl);
    text-align: center;
    }

.loading-animation {
    position: relative;
    min-height: 200px;
    margin-bottom: var(--spacing-xl);
    }

.loading-step {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
    display: flex;
        flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.loading-step.active {
    opacity: 1;
    transform: translateY(0);
    position: relative;
    }

.loading-step.completed {
    opacity: 0.3;
    transform: translateY(-20px);
    }

.step-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    box-shadow: var(--shadow-lg);
    animation: pulse 2s ease-in-out infinite;
    position: relative;
    }

.loading-step.active .step-icon {
    animation: pulse 2s ease-in-out infinite, float 3s ease-in-out infinite;
}

.loading-step.completed .step-icon {
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    animation: none;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 15px 35px -5px rgba(59, 130, 246, 0.6);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.step-text {
    text-align: center;
}

.step-text h4 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.step-text p {
    font-size: 1rem;
    color: var(--gray-600);
    margin: 0;
}

.loading-progress {
    margin-top: var(--spacing-xl);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
    width: 0%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.progress-steps {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.step-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--gray-300);
    transition: all 0.3s ease;
    position: relative;
}

.step-dot.active {
    background: var(--primary-600);
    transform: scale(1.3);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.step-dot.completed {
    background: var(--success-500);
}

.step-dot.active::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background: white;
    border-radius: var(--radius-full);
    animation: dotPulse 1.5s ease-in-out infinite;
}

@keyframes dotPulse {

    0%,
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(0.8);
    }
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .app-header {
        padding: var(--spacing-lg);
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .brand {
        flex-direction: column;
        width: 100%;
    }

    .header-right {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-md);
    }

    .header-nav {
        width: 100%;
        justify-content: center;
    }

    .header-badge {
        width: auto;
    }

    .app-main {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .section-title {
        font-size: 1.5rem;
    }

    .upload-area {
        padding: var(--spacing-lg);
    }

    .sample-images-section {
        padding: var(--spacing-md);
        margin-left: var(--spacing-md);
        margin-right: var(--spacing-md);
    }

    .sample-header h3 {
        font-size: 1.25rem;
    }

    .sample-header i {
        font-size: 2rem;
    }

    .sample-buttons {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        max-width: 100%;
        padding: 0;
    }
    
    .sample-buttons form {
        width: 100%;
        display: flex;
        justify-content: center;
    }

    .sample-btn {
        padding: var(--spacing-lg);
        width: 100%;
        max-width: 400px;
    }

    .sample-btn i {
        font-size: 2rem;
    }

    .sample-btn span {
        font-size: 1rem;
    }

    .sample-btn small {
        font-size: 0.8rem;
    }

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

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

    .results-header {
    flex-direction: column;
        align-items: flex-start;
    }

    .confidence-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .confidence-number {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .brand-title {
        font-size: 2rem;
    }

    .brand-subtitle {
        font-size: 0.9rem;
    }

    .upload-zone {
        padding: var(--spacing-lg);
    }

    .upload-icon-wrapper {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.875rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    body {
        background: white;
    }

    .app-header,
    .app-footer,
    .action-buttons,
    .upload-section {
        display: none;
    }

    .results-section {
        box-shadow: none;
    }
}

/* ============================================
   About Page Styles
   ============================================ */

.about-section {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-2xl) 0;
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.about-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-serif);
}

.about-intro {
    font-size: 1.125rem;
    color: var(--gray-600);
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto;
}

.process-overview,
.model-info {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.section-heading {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-heading i {
    color: var(--primary-600);
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.process-step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary-500);
    transition: all var(--transition-base);
}

.process-step:hover {
    background: var(--primary-50);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.step-content {
    flex: 1;
}

.step-content h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.step-content p {
    font-size: 1rem;
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.tech-detail {
    font-size: 0.875rem;
    color: var(--gray-600);
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-500);
    margin-top: var(--spacing-sm);
}

.tech-detail strong {
    color: var(--gray-900);
}

.metrics-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.metrics-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--gray-700);
    line-height: 1.7;
}

.metrics-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-600);
    font-weight: bold;
    font-size: 1.25rem;
}

.metrics-list li strong {
    color: var(--gray-900);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.info-card {
    background: var(--gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-300);
    background: white;
}

.info-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.info-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.info-card p {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.7;
}

.info-card p strong {
    color: var(--gray-900);
}

.important-notice {
    background: linear-gradient(135deg, var(--danger-50), var(--warning-50));
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    border: 2px solid var(--danger-300);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.notice-icon-large {
    font-size: 3rem;
    color: var(--danger-600);
    flex-shrink: 0;
}

.notice-content-large {
    flex: 1;
}

.notice-content-large h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.notice-content-large p {
    font-size: 1rem;
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.notice-content-large p strong {
    color: var(--gray-900);
}

.notice-content-large ul {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

.notice-content-large ul li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--gray-700);
    line-height: 1.7;
}

.notice-content-large ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--danger-600);
    font-weight: bold;
}

.action-section {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

/* Responsive adjustments for About page */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
}

    .header-nav {
        order: 3;
        width: 100%;
        justify-content: center;
        margin-top: var(--spacing-md);
}

    .about-title {
        font-size: 2rem;
    }

    .process-step {
    flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
}

    .important-notice {
        flex-direction: column;
        text-align: center;
}

    .notice-icon-large {
        margin: 0 auto;
    }
}