/* ===========================
   jackdesigns.tech — Styles
   =========================== */

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

:root {
    --bg:        #0d1117;
    --surface:   #161b22;
    --border:    #30363d;
    --text:      #e6edf3;
    --text-muted:#8b949e;
    --accent:    #58a6ff;
    --accent-2:  #3fb950;
    --tag-bg:    #1f6feb22;
    --tag-text:  #79c0ff;
    --radius:    8px;
    --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* --- Navigation --- */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
    letter-spacing: 0.02em;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 28px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

/* --- Main Layout --- */
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border);
}

section:last-child {
    border-bottom: none;
}

/* --- Hero --- */
.hero {
    min-height: calc(100vh - 120px);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding: 80px 0;
}

.hero-content {
    max-width: 680px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 8px;
}

.tagline {
    font-size: 1.25rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 20px;
}

.hero-sub {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 36px;
    max-width: 560px;
}

.btn-primary {
    display: inline-block;
    background: var(--accent);
    color: var(--bg);
    text-decoration: none;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    transition: opacity 0.2s;
}

.btn-primary:hover {
    opacity: 0.85;
}

/* --- Section Headers --- */
h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-intro {
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 600px;
}

/* --- Projects Grid --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color 0.2s, transform 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

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

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.tag {
    background: var(--tag-bg);
    color: var(--tag-text);
    font-size: 0.72rem;
    padding: 3px 8px;
    border-radius: 20px;
    font-weight: 500;
}

.project-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.project-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.project-meta {
    margin-top: 14px;
    font-size: 0.8rem;
    color: var(--accent-2);
}

/* --- About --- */
.about-content p {
    color: var(--text-muted);
    margin-bottom: 16px;
    font-size: 1.05rem;
    max-width: 720px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 32px;
    margin-top: 36px;
}

.skill-group h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 12px;
    font-weight: 600;
}

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

.skill-group li {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 4px 0;
    border-bottom: 1px solid var(--border);
}

/* --- Publications --- */
.publications-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.publications-list li {
    padding: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
}

.publications-list strong {
    color: var(--text);
    font-size: 1rem;
}

.publications-list br + br {
    color: var(--text-muted);
}

/* --- Contact --- */
.contact-section p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.contact-link {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: border-color 0.2s, color 0.2s;
}

.contact-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- Footer --- */
/* --- 3D Model Viewer in posts --- */
.model-viewer-wrap {
    margin: 20px 28px;
    background: rgba(3, 0, 20, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
}

.model-viewer-label {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: rgba(3, 0, 20, 0.7);
    padding: 4px 12px;
    border-radius: 20px;
    z-index: 10;
    pointer-events: none;
    opacity: 0.8;
}

#slac-canvas {
    display: block;
    width: 100%;
    height: 420px;
    cursor: grab;
}

#slac-canvas:active { cursor: grabbing; }

/* --- Blog Posts --- */
.posts-list { display: flex; flex-direction: column; gap: 60px; }

.post-card {
    background: rgba(11, 11, 46, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    backdrop-filter: blur(8px);
}

.post-header { padding: 28px 28px 0; }

.post-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.post-meta time {
    font-size: 0.82rem;
    color: var(--accent-2);
    font-weight: 500;
}

.post-tag {
    background: var(--tag-bg);
    color: var(--tag-text);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 12px;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.post-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text);
}

.post-images {
    display: flex;
    gap: 12px;
    padding: 20px 28px;
    overflow-x: auto;
    flex-wrap: wrap;
}

.post-images img {
    max-height: 280px;
    width: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    object-fit: cover;
    flex: 1 1 300px;
}

.post-content {
    padding: 0 28px 28px;
}

.post-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 14px;
}

.post-content p:last-child { margin-bottom: 0; }

.post-team {
    margin-top: 20px !important;
    padding: 14px;
    background: rgba(139, 92, 246, 0.08);
    border-radius: 6px;
    border-left: 3px solid var(--accent);
}

/* --- 3D Viewer Layout --- */
.viewer-layout { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; }

.viewer-canvas-wrap {
    background: rgba(11, 11, 46, 0.5);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    transition: border-color 0.2s;
}

.viewer-canvas-wrap:hover { border-color: var(--accent); }

.viewer-info {
    padding: 20px;
    background: rgba(11, 11, 46, 0.7);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.viewer-info h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 12px;
    font-weight: 600;
}

.viewer-info h4 { font-size: 0.8rem; }

.viewer-legend { list-style: none; }
.viewer-legend li { font-size: 0.82rem; color: var(--text-muted); padding: 6px 0; border-bottom: 1px solid var(--border); }
.viewer-legend li:last-child { border-bottom: none; }

.color-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; vertical-align: middle; }

@media (max-width: 768px) {
    .viewer-layout { grid-template-columns: 1fr; }
    .viewer-canvas-wrap { height: 360px; }
}

footer {
    padding: 40px 24px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

/* --- Responsive --- */
@media (max-width: 640px) {
    .nav-links {
        gap: 16px;
    }

    .hero {
        min-height: auto;
        padding: 60px 0;
    }

    section {
        padding: 60px 0;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }
}