/* ==========================================
   Theme Configuration Variables
   ========================================== */
:root {
    /* Brand Colors */
    --brand-blue: #0969da;
    --brand-blue-dark: #0550ae;
    --text-primary: #1f2328;
    --text-muted: #656d76;
    --surface-main: #ffffff;
    --surface-accent: #f6f8fa;
    --outline-color: #d1d9e0;
    --shadow-subtle: rgba(31, 35, 40, 0.04);
    
    /* Font Configuration */
    --typeface: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --text-base: 16px;
    --text-medium: 1.25rem;
    --text-big: 1.75rem;
    --text-huge: 2.5rem;
    --line-spacing: 1.6;
    
    /* Layout Spacing */
    --gap-tiny: 0.5rem;
    --gap-small: 1rem;
    --gap-regular: 1.5rem;
    --gap-large: 2rem;
    --gap-huge: 3rem;
    
    /* Design Elements */
    --content-limit: 900px;
    --curve-radius: 8px;
    --animate-speed: 0.3s;
}

/* Dark Theme Adaptation */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e6edf3;
        --text-muted: #7d8590;
        --surface-main: #0d1117;
        --surface-accent: #161b22;
        --outline-color: #30363d;
        --shadow-subtle: rgba(0, 0, 0, 0.3);
    }
}

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

html {
    font-size: var(--text-base);
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
}

body {
    font-family: var(--typeface);
    color: var(--text-primary);
    background-color: var(--surface-main);
    line-height: var(--line-spacing);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ==========================================
   Page Indicators Navigation
   ========================================== */
.page-indicators {
    position: fixed;
    right: var(--gap-large);
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: var(--gap-regular);
}

.indicator {
    position: relative;
    display: block;
    width: 12px;
    height: 12px;
    background: var(--outline-color);
    border-radius: 50%;
    transition: all var(--animate-speed);
    text-decoration: none;
}

.indicator:hover {
    background: var(--brand-blue);
    transform: scale(1.3);
}

.indicator.current-page {
    background: var(--brand-blue);
    width: 14px;
    height: 14px;
}

.indicator-label {
    position: absolute;
    right: calc(100% + var(--gap-small));
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    font-size: 0.875rem;
    color: var(--text-muted);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--animate-speed);
}

.indicator:hover .indicator-label {
    opacity: 1;
}

/* ==========================================
   Full Page Section Layout
   ========================================== */
.page-wrapper {
    width: 100%;
}

.fullpage-section {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    padding: var(--gap-large) var(--gap-regular);
}

.section-inner {
    width: 100%;
    max-width: var(--content-limit);
    margin: 0 auto;
}

/* Alternating Background Pattern */
.info-page,
.certs-page {
    background-color: var(--surface-accent);
}

/* ==========================================
   Hero Page Styling
   ========================================== */
.hero-page {
    text-align: center;
}

.hero-greeting {
    font-size: var(--text-huge);
    font-weight: 700;
    margin-bottom: var(--gap-regular);
    color: var(--text-primary);
}

.hero-description {
    font-size: var(--text-medium);
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto var(--gap-huge);
    line-height: 1.5;
}

.continue-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--gap-small);
    color: var(--text-muted);
    animation: bobbing 2s ease-in-out infinite;
}

.continue-text {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.continue-arrow {
    width: 24px;
    height: 24px;
}

@keyframes bobbing {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

/* ==========================================
   Content Page Typography
   ========================================== */
.page-headline {
    font-size: var(--text-big);
    font-weight: 600;
    margin-bottom: var(--gap-large);
    color: var(--text-primary);
}

.info-block {
    max-width: 750px;
}

.intro-paragraph {
    margin-bottom: var(--gap-regular);
    color: var(--text-primary);
    font-size: 1.05rem;
}

.specialty-items {
    list-style: none;
    padding-left: 0;
}

.specialty {
    padding: var(--gap-tiny) 0;
    color: var(--text-primary);
    font-size: 1.05rem;
}

/* ==========================================
   Technology Cards Grid
   ========================================== */
.technology-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--gap-regular);
    margin-bottom: var(--gap-large);
}

.tech-category {
    padding: var(--gap-regular);
    background-color: var(--surface-accent);
    border: 1px solid var(--outline-color);
    border-radius: var(--curve-radius);
    transition: transform var(--animate-speed), box-shadow var(--animate-speed), border-color var(--animate-speed);
}

.tech-page .tech-category {
    background-color: var(--surface-main);
}

.tech-category:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow-subtle);
    border-color: var(--brand-blue);
}

.category-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--gap-small);
    color: var(--brand-blue);
}

.category-items {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.primary-focus {
    padding: var(--gap-regular);
    background-color: var(--surface-accent);
    border-left: 4px solid var(--brand-blue);
    border-radius: var(--curve-radius);
    color: var(--text-primary);
    font-size: 1.05rem;
}

.tech-page .primary-focus {
    background-color: var(--surface-main);
}

/* ==========================================
   Certification Badges
   ========================================== */
.certification-badges {
    list-style: none;
    padding-left: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--gap-regular);
}

.badge-item {
    padding: var(--gap-regular);
    background-color: var(--surface-main);
    border-radius: var(--curve-radius);
    color: var(--text-primary);
    font-size: 1.05rem;
}

/* ==========================================
   Connection Profile Links
   ========================================== */
.connection-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--gap-regular);
    margin-bottom: var(--gap-huge);
}

.profile-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--gap-large);
    background-color: var(--surface-accent);
    border: 2px solid var(--outline-color);
    border-radius: var(--curve-radius);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--animate-speed);
    min-height: 140px;
}

.profile-link:hover {
    border-color: var(--brand-blue);
    transform: translateY(-6px);
    box-shadow: 0 10px 20px var(--shadow-subtle);
}

.link-symbol {
    font-size: 2.5rem;
    margin-bottom: var(--gap-tiny);
    color: var(--text-primary);
}

/* SVG Icon Styling */
.profile-link svg.link-symbol {
    width: 40px;
    height: 40px;
    margin-bottom: var(--gap-tiny);
}

.link-name {
    font-size: 1.1rem;
    font-weight: 600;
}

/* ==========================================
   Contact Information
   ========================================== */
.outreach-message {
    font-size: 1.05rem;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--gap-huge);
}

.inline-link {
    color: var(--brand-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--animate-speed);
}

.inline-link:hover {
    color: var(--brand-blue-dark);
    text-decoration: underline;
}

/* ==========================================
   Footer Credits
   ========================================== */
.page-credits {
    text-align: center;
    padding: var(--gap-large) 0 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ==========================================
   Responsive Adaptations
   ========================================== */

/* Tablet Adjustments */
@media (max-width: 768px) {
    :root {
        --text-huge: 2rem;
        --text-big: 1.5rem;
        --gap-huge: 2rem;
    }
    
    .fullpage-section {
        padding: var(--gap-regular) var(--gap-small);
    }
    
    .page-indicators {
        right: var(--gap-small);
    }
    
    .technology-cards {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
    
    .connection-options {
        grid-template-columns: 1fr;
    }
}

/* Mobile Optimizations */
@media (max-width: 480px) {
    :root {
        --text-huge: 1.75rem;
        --text-big: 1.25rem;
        --text-medium: 1.1rem;
        --gap-large: 1.5rem;
    }
    
    html {
        scroll-snap-type: none;
    }
    
    .fullpage-section {
        min-height: auto;
        padding: var(--gap-huge) var(--gap-small);
    }
    
    .page-indicators {
        display: none;
    }
    
    .technology-cards {
        grid-template-columns: 1fr;
    }
    
    .certification-badges {
        grid-template-columns: 1fr;
    }
    
    .profile-link {
        min-height: 120px;
    }
}

/* ==========================================
   Accessibility Enhancements
   ========================================== */

/* Keyboard Focus Styling */
a:focus,
button:focus {
    outline: 2px solid var(--brand-blue);
    outline-offset: 2px;
}

/* Respect Motion Preferences */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Print Optimization */
@media print {
    body {
        background-color: white;
        color: black;
    }
    
    .page-indicators {
        display: none;
    }
    
    .fullpage-section {
        page-break-inside: avoid;
        min-height: auto;
    }
    
    .profile-link {
        border: 1px solid #000;
    }
    
    a {
        color: #0000ff;
        text-decoration: underline;
    }
}