/* ============================================
   CSS Design System - Pneumonia Detection AI
   ============================================ */

/* CSS Variables / Design Tokens */
:root {
    /* Color Palette */
    --color-bg-primary: #0a0f1c;
    --color-bg-secondary: #111827;
    --color-bg-card: rgba(17, 24, 39, 0.7);
    --color-bg-card-hover: rgba(31, 41, 55, 0.8);
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --gradient-bg: linear-gradient(135deg, #0a0f1c 0%, #1a1f2e 50%, #0d1117 100%);
    
    /* Accent Colors */
    --color-accent-primary: #667eea;
    --color-accent-secondary: #764ba2;
    --color-accent-cyan: #22d3ee;
    --color-accent-pink: #ec4899;
    
    /* Status Colors */
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;
    
    /* Text Colors */
    --color-text-primary: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    
    /* Border Colors */
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-hover: rgba(255, 255, 255, 0.2);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    
    /* 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: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-Index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-modal: 1000;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================
   Background Animation
   ============================================ */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-bg);
}

.bg-orbs {
    position: absolute;
    inset: 0;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-accent-primary);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-secondary);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-cyan);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.3;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

/* ============================================
   Container Layout
   ============================================ */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-6);
    position: relative;
    z-index: var(--z-base);
}

/* ============================================
   Glass Card Component
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ============================================
   Header Styles
   ============================================ */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6) 0;
    margin-bottom: var(--spacing-8);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.logo-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.logo-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.logo-text h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 400;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-warning);
    animation: pulse 2s infinite;
}

.status-indicator.online .status-dot {
    background: var(--color-success);
}

.status-indicator.offline .status-dot {
    background: var(--color-danger);
    animation: none;
}

.status-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.9);
    }
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

.section-header {
    margin-bottom: var(--spacing-6);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-1);
}

.section-header p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   Upload Section
   ============================================ */
.upload-area {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-12);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: rgba(102, 126, 234, 0.02);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--color-accent-primary);
    background: rgba(102, 126, 234, 0.08);
    transform: scale(1.01);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
}

.upload-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    transition: transform var(--transition-base);
}

.upload-area:hover .upload-icon {
    transform: translateY(-4px);
}

.upload-icon svg {
    width: 40px;
    height: 40px;
    color: white;
}

.upload-text {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.primary-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.secondary-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.supported-formats {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: var(--spacing-2) var(--spacing-4);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
}

/* ============================================
   Preview Container
   ============================================ */
.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-6);
    margin-top: var(--spacing-6);
    animation: fadeIn 0.3s ease;
}

.preview-image-wrapper {
    position: relative;
    display: inline-block;
}

.preview-image-wrapper img {
    max-width: 400px;
    max-height: 400px;
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.remove-image {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--color-danger);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast), background var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.remove-image:hover {
    transform: scale(1.1);
    background: #dc2626;
}

.remove-image svg {
    width: 18px;
    height: 18px;
}

.analyze-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-8);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.analyze-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 60px rgba(102, 126, 234, 0.4);
}

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

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

.btn-icon svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.analyze-btn:hover .btn-icon svg {
    transform: translateX(4px);
}

/* ============================================
   Results Section
   ============================================ */
.results-section {
    animation: slideUp 0.4s ease;
}

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

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

.analysis-time {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-6);
    padding: var(--spacing-12);
}

.loader {
    position: relative;
    width: 80px;
    height: 80px;
}

.loader-ring {
    position: absolute;
    inset: 0;
    border: 3px solid transparent;
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1.2s linear infinite;
}

.loader-ring:nth-child(2) {
    inset: 8px;
    border-top-color: var(--color-accent-secondary);
    animation-delay: -0.4s;
}

.loader-ring:nth-child(3) {
    inset: 16px;
    border-top-color: var(--color-accent-cyan);
    animation-delay: -0.8s;
}

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

.loading-state p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

/* Results Content */
.results-content {
    animation: fadeIn 0.4s ease;
}

.prediction-result {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
    padding: var(--spacing-6);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-6);
}

.diagnosis-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-xl);
    font-weight: 700;
    align-self: center;
}

.diagnosis-badge.normal {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.diagnosis-badge.pneumonia {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.diagnosis-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
}

.confidence-score {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.confidence-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    min-width: 80px;
}

.confidence-bar-container {
    flex: 1;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.confidence-bar {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.8s ease;
    background: var(--gradient-primary);
}

.confidence-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    min-width: 60px;
    text-align: right;
}

/* Probability Breakdown */
.probability-breakdown {
    margin-bottom: var(--spacing-6);
}

.probability-breakdown h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--color-text-secondary);
}

.probability-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.probability-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding: var(--spacing-3) var(--spacing-4);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
}

.probability-item-label {
    min-width: 120px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.probability-item-bar-container {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.probability-item-bar {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.8s ease;
}

.probability-item-bar.normal {
    background: var(--gradient-success);
}

.probability-item-bar.pneumonia {
    background: var(--gradient-danger);
}

.probability-item-value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    min-width: 50px;
    text-align: right;
}

/* Disclaimer */
.result-disclaimer {
    display: flex;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-lg);
    color: var(--color-warning);
}

.result-disclaimer svg {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 2px;
}

.result-disclaimer p {
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* ============================================
   Info Section
   ============================================ */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
}

.info-item {
    padding: var(--spacing-4);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
}

.info-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    padding: var(--spacing-8) 0;
    margin-top: var(--spacing-8);
    border-top: 1px solid var(--color-border);
}

.footer p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-4);
    }
    
    .header {
        flex-direction: column;
        gap: var(--spacing-4);
        text-align: center;
    }
    
    .logo {
        flex-direction: column;
    }
    
    .glass-card {
        padding: var(--spacing-5);
    }
    
    .upload-area {
        padding: var(--spacing-8);
    }
    
    .upload-icon {
        width: 60px;
        height: 60px;
    }
    
    .upload-icon svg {
        width: 30px;
        height: 30px;
    }
    
    .preview-image-wrapper img {
        max-width: 100%;
    }
    
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .confidence-score {
        flex-wrap: wrap;
    }
    
    .confidence-label {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: var(--font-size-xl);
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .diagnosis-badge {
        font-size: var(--font-size-lg);
        padding: var(--spacing-3) var(--spacing-4);
    }
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

.slide-up {
    animation: slideUp 0.4s ease;
}