/* Reusable design tokens for consistency */
:root {
    /* Brand Colors */
    --color-brand-primary: #1b8bb8;
    --color-brand-dark: #0e5a7a;
    --color-azure-blue: #0078d4;
    --color-azure-dark: #005a9e;
    --color-azure-light: #106ebe;
    
    /* Text Colors */
    --color-text-primary: #333;
    --color-text-secondary: #6b7280;
    --color-text-heading: #2c3e50;
    --color-text-light: #4b5563;
    
    /* Background Colors */
    --color-bg-page: #f5f7fa;
    --color-bg-white: #ffffff;
    --color-bg-card: #f9fafb;
    
    /* Border Colors */
    --color-border-light: #e5e7eb;
    --color-border-medium: #9ca3af;
    --color-border-dark: #4b5563;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.15);
    --shadow-button: 0 4px 12px rgba(0, 120, 212, 0.3);
    --shadow-button-hover: 0 6px 20px rgba(0, 120, 212, 0.4);
    
    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-page);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Typography */
h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--color-text-heading);
}

h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #34495e;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

/* Provides consistent max-width and padding across sections */
.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-dark) 100%);
    color: var(--color-bg-white);
    padding: var(--spacing-lg) var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
}

.header-text h1 {
    margin-bottom: 0.5rem;
}

.header-card {
    text-align: right;
}

.header-separator {
    width: 191px;
    height: 2px;
    background: rgba(255, 255, 255, 0.7);
    border: none;
    margin: 0.5rem 0 0 0;
}

.intro-text {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 300;
}

.header-links {
    display: flex;
    gap: var(--spacing-md);
}

.header-links a {
    color: var(--color-bg-white);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-normal);
}

.header-links a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Interactive button */
.counter-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.counter-label {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.trigger-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-azure-blue), var(--color-azure-dark));
    color: white;
    border: none;
    border-radius: 50%;
    width: 80px;
    height: 80px;
    font-size: 2rem;
    font-weight: 700;
    cursor: pointer;
    /* Specific transitions for better performance */
    transition: transform var(--transition-normal), 
                box-shadow var(--transition-normal), 
                background var(--transition-normal);
    box-shadow: var(--shadow-button);
}

.trigger-button:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-azure-light), var(--color-azure-blue));
    transform: scale(1.05);
    box-shadow: var(--shadow-button-hover);
}

.trigger-button:active:not(:disabled) {
    transform: scale(0.95);
}

.trigger-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#counter.pending {
    opacity: 0.5;
    animation: pulse 0.8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Diagram */
.diagram {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.node {
    background: var(--color-bg-white);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    /* Specific transitions for better performance */
    transition: transform var(--transition-normal), 
                box-shadow var(--transition-normal), 
                border-color var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.node:hover {
    border-color: var(--color-border-medium);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Improved focus styles for accessibility */
.node:focus-visible {
    outline: 2px solid var(--color-azure-blue);
    outline-offset: 2px;
}

.node.active {
    border-color: var(--color-border-dark);
    background: var(--color-bg-card);
}

.node-title {
    font-size: 1rem;
    font-weight: 600;
    color: #1f2937;
}

.node-description {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal), 
                margin-top var(--transition-normal);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    text-align: left;
}

.node.active .node-description {
    max-height: 200px;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border-light);
}

.node.pulse {
    animation: subtlePulse var(--transition-fast) ease-out;
}

@keyframes subtlePulse {
    0% { box-shadow: 0 0 0 0 rgba(96, 165, 250, 0.6); }
    50% { box-shadow: 0 0 0 12px rgba(96, 165, 250, 0); }
    100% { box-shadow: 0 0 0 0 rgba(96, 165, 250, 0); }
}

/* Highlight classes for connection visualization */
.node.highlight-workflow {
    border-color: var(--color-border-medium);
    box-shadow: 0 0 0 3px rgba(156, 163, 175, 0.2);
}

.node.highlight-azure {
    border-color: #60a5fa;
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
}

.node.highlight-infra {
    border-color: #a78bfa;
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.2);
}

.node.highlight-yellow {
    border-color: #facc15;
    box-shadow: 0 0 0 16px rgba(250, 204, 21, 0.3);
}

/* Summary Section */
.summary {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}

.summary h3 {
    margin-bottom: var(--spacing-md);
}

.highlights {
    list-style-position: inside;
    padding-left: 0;
}

.highlights li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    color: var(--color-text-light);
}

.highlights li::marker {
    color: var(--color-brand-primary);
}

/* Skills & Experience */
#experience {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg) auto;
}

.skill-category {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-brand-primary);
}

.skill-category:last-child {
    margin-bottom: 0;
}

.skill-category h4 {
    margin-bottom: var(--spacing-sm);
}

.skill-category .highlights {
    padding-left: 1.25rem;
}

.skill-category .highlights li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

/* Certifications */
#certifications {
    background: linear-gradient(to bottom, var(--color-bg-page), var(--color-bg-white));
    border-radius: var(--radius-lg);
}

.certifications-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: var(--spacing-sm);
    max-width: 800px;
    margin: 0 auto;
}

.certifications-container a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.certification-item {
    text-align: center;
    padding: 1.7rem;
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    /* Specific transitions for better performance */
    transition: transform var(--transition-normal), 
                box-shadow var(--transition-normal);
}

.certification-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.certification-item img {
    width: 80px;
    height: 80px;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.certification-text strong {
    display: block;
    color: var(--color-brand-primary);
    font-size: 1.25rem;
}

.certification-text span {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* 24-hour chart */
.chart-section {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.chart-section h3 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-heading);
}

.chart-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    height: 300px; /* Required for Chart.js */
}

#clickChart {
    width: 100%;
    height: 100%;
}

/* Footer */
.footer {
    background: var(--color-text-heading);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer p {
    margin: 0.4rem 0;
    font-size: 0.875rem;
}

.footer a {
    text-decoration: none;
    color: var(--color-azure-blue);
    font-weight: bold;
    transition: color 0.2s ease;
}

.footer a:hover {
    text-decoration: underline;
}

/* Utility Classes for accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Desktop: 768px+ */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl) 2.5rem;
    }
    
    .header {
        padding: var(--spacing-xl) 2.5rem;
    }
    
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    
    .header-links {
        gap: var(--spacing-lg);
    }
    
    .diagram {
        gap: 2.5rem;
    }
    
    .row {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
    
    .row-2 .empty {
        display: block;
    }
}

/* Mobile screens */
@media (max-width: 640px) {

    .header-separator {
        margin: 0.5rem auto 0 auto; 
            max-width: 120px;
    }

    .certifications-container {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 250px;
    }
    
    .chart-section {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .header {
        background: none;
        color: #000;
    }
    
    .trigger-button,
    .chart-section {
        display: none;
    }
    
    /* Show simplified diagram for print */
    .diagram {
        page-break-inside: avoid;
    }
    
    .node {
        page-break-inside: avoid;
        border: 1px solid #333;
    }
}