/* ==========================================================================
   Dr. Victor Arenas Portfolio Stylesheet
   Design Paradigm: Premium Minimalist Charcoal & Crisp Teal
   No bolding of body copy; line-height 1.25; fluid responsive layouts.
   ========================================================================== */

/* Design Tokens & CSS Variables */
:root {
    --bg-base: #f8fafc;          /* Light slate base background */
    --bg-surface: #ffffff;       /* Pure white card surface */
    --bg-surface-hover: #f1f5f9; /* Soft grey card surface hover state */
    --border-color: #cbd5e1;      /* Crisp slate border line */
    --border-hover: #0d9488;      /* Teal accent for hover outline */
    
    --accent-teal: #0d9488;       /* Primary crisp teal */
    --accent-teal-hover: #0f766e; /* Teal hover highlight (darker for readability) */
    --accent-teal-alpha: rgba(13, 148, 136, 0.08);
    --accent-teal-glow: rgba(13, 148, 136, 0.2);
    
    --text-primary: #0f172a;      /* Slate-900 headings */
    --text-secondary: #475569;    /* Slate-600 body copy */
    --text-muted: #64748b;         /* Slate-500 subtext */
    
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --blur-glass: blur(12px);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    background-color: var(--bg-base);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    line-height: 1.25;
    font-weight: 300; /* Regular lightweight body typography */
    overflow-x: hidden;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* No Bolding for Body Copy */
p, li, span, blockquote, a, time, button {
    font-weight: 300;
}

/* Headings - Using weight variants only for hierarchy */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 500;
    letter-spacing: -0.02em;
}

/* Layout Containers */
.main-content {
    flex: 1 0 auto;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 24px 48px 24px; /* Header spacing offset */
}

/* App Header & Navigation */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: var(--blur-glass);
    -webkit-backdrop-filter: var(--blur-glass);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.app-header.scrolled {
    padding: 6px 0;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    text-decoration: none;
}

.logo-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--accent-teal);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.875rem;
    text-decoration: none;
    color: var(--text-muted);
    transition: var(--transition-smooth);
    padding: 6px 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-teal);
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--accent-teal);
}

.nav-link.active::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
}

/* Page Panels Structure */
.page-panel {
    display: none;
    animation: fadeIn 0.45s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
}

.page-panel.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Panel Headers */
.panel-header {
    margin-bottom: 48px;
    max-width: 800px;
}

.badge-accent {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-teal);
    background-color: var(--accent-teal-alpha);
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.panel-header h2 {
    font-size: 2.25rem;
    margin-bottom: 12px;
    font-weight: 500;
}

.panel-intro {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* 1. Home / Executive Summary Page Styles */
.hero-section {
    padding: 60px 0 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 800px;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-teal) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-credentials {
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.hero-tagline {
    font-size: 1.35rem;
    color: var(--text-secondary);
    line-height: 1.35;
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    gap: 16px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 48px;
    align-items: center;
}

.hero-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-profile-img {
    width: 300px;
    height: 300px;
    border-radius: 20px;
    object-fit: cover;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
}

.hero-profile-img:hover {
    border-color: var(--border-hover);
    transform: scale(1.02);
}

.badge-banner-container {
    margin-bottom: 36px;
    text-align: center;
    width: 100%;
}

.badge-banner-img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.badge-banner-img:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: 6px;
    transition: var(--transition-smooth);
    cursor: pointer;
    background: none;
    border: none;
}

.btn-primary {
    background-color: var(--accent-teal);
    color: #ffffff;
    border: 1px solid var(--accent-teal);
}

.btn-primary:hover {
    background-color: var(--accent-teal-hover);
    border-color: var(--accent-teal-hover);
    box-shadow: 0 0 16px var(--accent-teal-glow);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* Value Prop & Summary Box */
.value-prop-section {
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.5rem;
    margin-bottom: 28px;
    position: relative;
    padding-left: 16px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background-color: var(--accent-teal);
}

.value-prop-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
}

.value-prop-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Expertise Grid */
.expertise-section {
    padding: 60px 0;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.expertise-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.expertise-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    color: var(--accent-teal);
    margin-bottom: 20px;
}

.expertise-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.card-bullets {
    list-style: none;
}

.card-bullets li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-left: 16px;
    position: relative;
    margin-bottom: 8px;
}

.card-bullets li::before {
    content: '→';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-teal);
}

/* 2. Academic & Leadership Page Styles */
.tenure-section {
    margin-bottom: 64px;
}

.timeline {
    position: relative;
    padding-left: 28px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 6px;
    width: 1px;
    height: calc(100% - 12px);
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -28px;
    top: 6px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: var(--bg-base);
    border: 2px solid var(--accent-teal);
    z-index: 2;
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--accent-teal);
    display: block;
    margin-bottom: 4px;
}

.timeline-content h4 {
    font-size: 1.15rem;
    margin-bottom: 2px;
}

.timeline-role {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.timeline-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Course Development Filtering & Grid */
.courses-section {
    margin-bottom: 64px;
}

.section-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 28px;
}

.subsection-title {
    font-size: 1.35rem;
    position: relative;
    padding-left: 16px;
}

.subsection-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 14px;
    background-color: var(--accent-teal);
}

.filter-container {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    font-size: 0.75rem;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.filter-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.filter-btn.active {
    background-color: var(--accent-teal);
    border-color: var(--accent-teal);
    color: var(--text-primary);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.course-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 8px;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    opacity: 1;
}

.course-card.hide {
    display: none;
}

.course-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.course-code {
    font-size: 0.75rem;
    color: var(--accent-teal);
    display: block;
    margin-bottom: 6px;
}

.course-card h4 {
    font-size: 1rem;
    margin-bottom: 10px;
    line-height: 1.25;
}

.course-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-grow: 1;
}

/* Academic Governance */
.governance-section {
    margin-bottom: 64px;
}

.governance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.governance-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 28px;
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.governance-card:hover {
    border-color: var(--border-hover);
}

.governance-card h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.gov-role {
    font-size: 0.8rem;
    color: var(--accent-teal);
    margin-bottom: 12px;
}

.gov-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Global Engagement & Media Link */
.global-section {
    margin-bottom: 32px;
}

.global-layout {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.global-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.global-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.video-container {
    width: 100%;
}

.video-link-card {
    display: flex;
    align-items: center;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 6px;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.video-link-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 0 12px var(--accent-teal-glow);
}

.video-preview-icon {
    color: var(--accent-teal);
    margin-right: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-link-text {
    display: flex;
    flex-direction: column;
}

.video-link-text span:first-child {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.video-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* 3. Professional Methodology & Inclusive Leadership Page Styles */
.methodology-intro-box {
    margin-bottom: 48px;
    background-color: var(--bg-surface);
    border-left: 2px solid var(--accent-teal);
    padding: 24px 32px;
    border-radius: 0 8px 8px 0;
}

.methodology-intro-box blockquote {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-style: italic;
}

.frameworks-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

.framework-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
    transition: var(--transition-smooth);
}

.framework-card:hover {
    border-color: var(--border-hover);
}

.framework-card h4 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--accent-teal);
}

.framework-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Case Study section */
.case-study-section {
    margin-bottom: 32px;
}

.case-study-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 8px;
}

.case-study-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.case-study-header h4 {
    font-size: 1.25rem;
}

.case-tag {
    font-size: 0.75rem;
    color: var(--accent-teal);
    border: 1px solid var(--accent-teal);
    padding: 4px 10px;
    border-radius: 4px;
}

.case-study-body {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.case-study-body:last-child {
    margin-bottom: 0;
}

/* 4. Certifications & Portfolio Showcase Page Styles */
.portfolio-section {
    margin-bottom: 64px;
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.badge-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.badge-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.badge-icon-wrap {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    transition: var(--transition-smooth);
}

.badge-card:hover .badge-icon-wrap {
    border-color: var(--accent-teal);
    box-shadow: 0 0 10px var(--accent-teal-alpha);
}

.badge-acronym {
    font-size: 0.75rem;
    color: var(--accent-teal);
    letter-spacing: 0.05em;
    font-weight: 500;
}

.badge-img {
    width: 64px !important;
    height: 64px !important;
    max-width: 64px !important;
    max-height: 64px !important;
    object-fit: contain;
    margin-bottom: 14px;
    transition: var(--transition-smooth);
}

.badge-card:hover .badge-img {
    transform: scale(1.08);
}

.badge-details h4 {
    font-size: 0.85rem;
    margin-bottom: 4px;
    line-height: 1.25;
}

.badge-issuer {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Milestones */
.milestones-section {
    margin-bottom: 64px;
}

.milestones-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.milestone-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
    position: relative;
    transition: var(--transition-smooth);
}

.milestone-card:hover {
    border-color: var(--border-hover);
}

.milestone-num {
    font-size: 2rem;
    color: var(--accent-teal-alpha);
    margin-bottom: 12px;
    font-weight: 700;
}

.milestone-card h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.milestone-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Testimonials / Alumni */
.testimonials-section {
    margin-bottom: 32px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.testimonial-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: 8px;
}

.testimonial-header {
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.testimonial-header h4 {
    font-size: 1.05rem;
    color: var(--text-primary);
}

.testimonial-title {
    font-size: 0.8rem;
    color: var(--accent-teal);
    margin-top: 2px;
}

.testimonial-body {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Footer Section */
.app-footer {
    flex-shrink: 0;
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    width: 100%;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.app-footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--accent-teal);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--accent-teal-hover);
}

.footer-links span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .badges-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .main-content {
        padding-top: 90px;
    }
    
    .hero-content h1 {
        font-size: 3rem;
    }
    
    .hero-tagline {
        font-size: 1.15rem;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }
    
    .hero-image-wrapper {
        order: -1;
    }
    
    .hero-profile-img {
        width: 240px;
        height: 240px;
    }
    
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .governance-grid {
        grid-template-columns: 1fr;
    }
    
    .global-layout {
        grid-template-columns: 1fr;
    }
    
    .frameworks-grid {
        grid-template-columns: 1fr;
    }
    
    .badges-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .milestones-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    /* Mobile Navigation Drawer */
    .mobile-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: var(--blur-glass);
        -webkit-backdrop-filter: var(--blur-glass);
        border-bottom: 0 solid var(--border-color);
        flex-direction: column;
        gap: 20px;
        padding: 0 24px;
        overflow: hidden;
        transition: var(--transition-smooth);
    }
    
    .nav-menu.open {
        height: 250px;
        padding: 24px;
        border-bottom-width: 1px;
    }
    
    .nav-link {
        font-size: 1rem;
        width: fit-content;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2.25rem;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 12px;
    }
    
    .badges-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}