:root {
    --bg-color: #0d0d0f;
    --card-bg: #16161a;
    --text-primary: #e1e1e6;
    --text-secondary: #a1a1aa;
    --accent-color: #3b82f6; /* Professional Tech Blue */
    --accent-glow: rgba(59, 130, 246, 0.2);
    --border-color: #27272a;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Identity */
header {
    padding: 6rem 0 4rem;
}

.identity-lockup {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.profile-img {
    width: 120px;
    height: 120px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    object-fit: cover;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Collapsible Eras */
details.era-block {
    border-top: 1px solid var(--border-color);
}

details.era-block:last-of-type {
    border-bottom: 1px solid var(--border-color);
}

details.era-block summary {
    list-style: none;
    cursor: pointer;
    padding: 2.5rem 0;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    outline: none;
}

details.era-block summary::-webkit-details-marker {
    display: none;
}

details.era-block summary h2.section-label {
    margin-bottom: 0;
    flex: 1;
    pointer-events: none;
}

details.era-block summary::before {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--accent-color);
    width: 20px;
    display: flex;
    justify-content: center;
    transition: transform 0.3s;
}

details.era-block[open] summary::before {
    content: '−';
}

details.era-block summary:hover h2.section-label {
    color: var(--text-primary);
}

/* Typography */
h2.section-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: color 0.3s;
}

h2.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
    opacity: 0.5;
}

/* Project Categories */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-bottom: 4rem;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.project-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(39, 39, 42, 0.3);
}

.project-item:last-child {
    border-bottom: none;
}

@media (max-width: 768px) {
    .project-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}

.project-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    background: #1e1e24;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    padding-bottom: 4rem;
}

.skill-cat h4 {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.skill-cat ul {
    list-style: none;
}

.skill-cat li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-cat li::before {
    content: '→';
    color: var(--border-color);
}

/* Certifications */
.cert-track {
    display: flex;
    flex-wrap: wrap;
    gap: 2.5rem;
    align-items: center;
    justify-content: center;
    padding: 2rem 0 4rem;
    opacity: 0.8;
}

.cert-item {
    filter: grayscale(1);
    opacity: 0.5;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    width: 80px;
    height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.cert-item:hover {
    filter: grayscale(0);
    opacity: 1;
    transform: scale(2.2);
    z-index: 10;
}

/* Expanded State (Modal) */
.cert-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: 3000;
    width: 95%;
    max-width: 1000px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cert-modal.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    display: flex;
    overflow: hidden;
    box-shadow: 0 40px 80px rgba(0,0,0,0.7);
    /* Remove min-height to allow shrink-wrap */
    align-items: stretch; 
}

.modal-left {
    flex: 0 0 42%; /* Slightly wider cert */
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem; /* Tight padding to maximize image size */
    border-right: 1px solid var(--border-color);
}

.modal-left img {
    width: 100%;
    height: auto;
    max-height: 85vh; /* Ensure it doesn't exceed viewport */
    object-fit: contain;
    filter: drop-shadow(0 15px 30px rgba(0,0,0,0.6));
    display: block;
}

.modal-right {
    flex: 1;
    padding: 3rem 4rem;
    display: flex;
    flex-direction: column;
    justify-content: center; /* Vertically center text within cert bounds */
    min-width: 0; /* Prevent flex blowout */
}

.modal-right h3 {
    font-size: 1.7rem;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-subtitle {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 700;
}

.modal-divider {
    height: 1px;
    background: var(--border-color);
    margin: 2rem 0;
    width: 40px;
}

.modal-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    margin-bottom: 1rem;
    font-weight: 700;
}

.modal-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 0; /* Align tightly */
}

.modal-close-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.7rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    border-radius: 6px;
    margin-top: 2.5rem;
    transition: all 0.3s;
    width: fit-content;
    align-self: flex-start;
}

.modal-close-btn:hover {
    background: #1e1e24;
    border-color: var(--text-secondary);
}

@media (max-width: 900px) {
    .modal-content {
        flex-direction: column;
    }
    .modal-left {
        flex: none;
        padding: 2.5rem;
    }
    .modal-right {
        padding: 3rem;
    }
}

/* Blur Overlay */
.cert-blur-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 13, 15, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease;
    cursor: zoom-out;
}

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

/* Original items state when something is expanded */
body.cert-open .container {
    pointer-events: none;
}

.cert-item img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

/* Footer */
footer {
    padding: 8rem 0 4rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-links {
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin: 0 1rem;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
}

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

.copyright {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* Visual Utilities */
.status-pill {
    font-size: 0.65rem;
    padding: 1px 6px;
    border-radius: 10px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-color);
    vertical-align: middle;
    margin-left: 8px;
}