/*
  assets/css/main.css
  ===================
  Main stylesheet for the Project Documentation Hub.
  Loaded by _layouts/default.html via a <link> tag.

  DO NOT add @import or external font URLs — GitHub Pages serves
  this as a plain static file and the goal is zero external dependencies.

  To retheme the site, update the CSS custom properties in :root.
  All colors, spacing tokens, and the border radius are defined there.

  Sections (in order):
    1. Design Tokens      (:root variables)
    2. Reset & Base       (html, body, box-sizing)
    3. Layout Wrapper     (.wrapper)
    4. Site Header        (.site-header, .nav-dot)
    5. Hero Section       (.hero, .hero-links, .hero-link)
    6. Section Label      (.section-label)
    7. Project Grid       (.grid)
    8. Project Card       (.card, .card h3, .card p)
    9. Card Type Label    (.card-label, .project, .portfolio)
   10. Status Pill        (.status)
   11. Key-Value Rows     (.kv, .kv-label, .kv-multi)
   12. Technology Badges  (.badges, .badge)
   13. Standards Block    (.standards)
   14. About Strip        (.about-strip, .about-left, .about-links)
   15. Site Footer        (.site-footer)
   16. Responsive         (@media max-width: 620px)
*/

        /* ============================================================
           DESIGN TOKENS
           All colors and shared values are defined here as CSS custom
           properties. Update this section to retheme the entire site.
           ============================================================ */
        :root {
            --bg:                 #0b1120; /* Page background              */
            --surface:            #111827; /* Header / raised surface      */
            --card:               #1a2333; /* Card background               */
            --card-hover:         #1f2d42; /* Card background on hover      */
            --line:               #1f2d3d; /* Borders and dividers          */
            --fg:                 #e2e8f0; /* Primary text                  */
            --muted:              #7d93b2; /* Secondary / subdued text      */
            --link:               #38bdf8; /* Links and interactive color   */
            --accent:             #0ea5e9; /* Primary accent (cyan)         */
            --accent2:            #6366f1; /* Secondary accent (indigo)     */
            --badge-bg:           #1e3a52; /* Tech badge background         */
            --badge-fg:           #7dd3fc; /* Tech badge text               */
            --portfolio-badge-bg: #1e1e3f; /* Portfolio badge background    */
            --portfolio-badge-fg: #a5b4fc; /* Portfolio badge text          */
            --portfolio-border:   #3730a3; /* Portfolio card border         */
            --green:              #34d399; /* Status indicator (live/ready) */
            --radius:             12px;    /* Standard border radius        */
        }

        /* ============================================================
           RESET & BASE
           ============================================================ */
        *, *::before, *::after { box-sizing: border-box; }

        html, body {
            margin: 0;
            padding: 0;
            background: var(--bg);
            color: var(--fg);
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            font-size: 15px;
            line-height: 1.65;
        }

        /* ============================================================
           LAYOUT WRAPPER
           Centers content with a maximum width. The header uses its
           own max-width internally to stay aligned with the wrapper.
           ============================================================ */
        .wrapper {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px 60px;
        }

        /* ============================================================
           SITE HEADER
           Sticky top bar with accent dot and site title link.
           z-index: 100 ensures it stays above card hover transforms.
           ============================================================ */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--line);
            padding: 14px 24px;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .site-header nav {
            max-width: 860px; /* Matches .wrapper for visual alignment */
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        /* Small accent dot to the left of the site title */
        .nav-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
            flex-shrink: 0;
        }
        .site-header a {
            color: var(--fg);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .site-header a:hover { color: var(--link); }

        /* ============================================================
           HERO SECTION
           Full-width intro block at the top of the index page.
           Contains the page title, subtitle, and quick-access links.
           ============================================================ */
        .hero {
            padding: 48px 0 32px;
            border-bottom: 1px solid var(--line);
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 1.65rem;
            font-weight: 700;
            margin: 0 0 8px;
        }
        .hero p {
            color: var(--muted);
            margin: 0 0 20px;
            max-width: 580px;
        }
        /* Row of pill-style navigation links (Portfolio, GitHub, LinkedIn) */
        .hero-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .hero-link {
            display: inline-flex;
            align-items: center;
            padding: 7px 14px;
            border-radius: 8px;
            border: 1px solid var(--line);
            background: var(--card);
            color: var(--link);
            text-decoration: none;
            font-size: 0.875rem;
            font-weight: 500;
            transition: border-color 0.15s, background 0.15s;
        }
        .hero-link:hover {
            border-color: var(--accent);
            background: var(--card-hover);
        }

        /* ============================================================
           SECTION LABEL
           Small uppercase label used as a visual divider between
           content sections (e.g. "PROJECT DOCUMENTATION").
           ============================================================ */
        .section-label {
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--muted);
            margin: 40px 0 14px;
        }

        /* ============================================================
           PROJECT GRID
           Uniform two-column grid for project cards. Collapses to a
           single column on narrow viewports (see responsive section).
           ============================================================ */
        .grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-bottom: 16px;
        }

        /* ============================================================
           PROJECT CARD
           Each card displays a project's type label, status, title,
           description, key-value links, and technology badges.
           Cards use flex-direction: column so the badge row always
           sits at the bottom regardless of content height.
           ============================================================ */
        .card {
            background: var(--card);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px;
            transition: border-color 0.15s, background 0.15s, transform 0.15s;
            display: flex;
            flex-direction: column;
        }
        /* Subtle lift effect on hover to indicate interactivity */
        .card:hover {
            border-color: var(--accent);
            background: var(--card-hover);
            transform: translateY(-2px);
        }
        .card h3 {
            margin: 0 0 4px;
            font-size: 1rem;
            color: var(--fg);
        }
        /* Description stretches to fill available space via flex: 1,
           keeping badges consistently at the bottom of each card */
        .card p {
            color: var(--muted);
            font-size: 0.875rem;
            margin: 0 0 14px;
            flex: 1;
        }

        /* ============================================================
           CARD TYPE LABEL
           Small pill in the top-left of each card indicating its type.
           Variants: .project (cyan) and .portfolio (indigo).
           ============================================================ */
        .card-label {
            display: inline-block;
            font-size: 0.68rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            border-radius: 4px;
            padding: 2px 7px;
            margin-bottom: 10px;
            width: fit-content;
        }
        .card-label.project {
            background: rgba(14, 165, 233, 0.1);
            color: var(--accent);
            border: 1px solid rgba(14, 165, 233, 0.25);
        }
        .card-label.portfolio {
            background: var(--portfolio-badge-bg);
            color: var(--portfolio-badge-fg);
            border: 1px solid var(--portfolio-border);
        }

        /* ============================================================
           STATUS PILL
           Inline deployment/build status indicator with a green dot.
           Used for production-ready projects deployed on Fly.io.
           ============================================================ */
        .status {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            font-size: 0.72rem;
            color: var(--green);
            font-weight: 600;
            margin-bottom: 10px;
        }
        /* Green dot rendered via ::before pseudo-element */
        .status::before {
            content: '';
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--green);
            flex-shrink: 0;
        }

        /* ============================================================
           KEY-VALUE ROWS
           Two-column grid inside a card for structured metadata:
           labels on the left (90px fixed), values on the right.
           .kv-multi stacks multiple links vertically in one value cell.
           ============================================================ */
        .kv {
            display: grid;
            grid-template-columns: 90px auto;
            gap: 5px 10px;
            margin-bottom: 12px;
            font-size: 0.8rem;
        }
        .kv-label {
            color: var(--muted);
            font-weight: 600;
            align-self: start;
            padding-top: 1px;
        }
        .kv a {
            color: var(--link);
            text-decoration: none;
            word-break: break-all; /* Prevents long URLs from overflowing */
        }
        .kv a:hover { text-decoration: underline; }
        /* Used when a single label maps to multiple URLs (e.g. split repos) */
        .kv-multi {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        /* ============================================================
           TECHNOLOGY BADGES
           Pill-shaped tags listing the tech stack for each project.
           Positioned at the bottom of the card via margin-top: auto.
           ============================================================ */
        .badges {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-top: auto;
            padding-top: 4px;
        }
        .badge {
            font-size: 0.7rem;
            padding: 3px 8px;
            border-radius: 999px;
            background: var(--badge-bg);
            color: var(--badge-fg);
            font-weight: 500;
        }
        /* Indigo variant used for portfolio-related badge entries */
        .badge.portfolio-badge {
            background: var(--portfolio-badge-bg);
            color: var(--portfolio-badge-fg);
        }

        /* ============================================================
           STANDARDS & CONVENTIONS BLOCK
           Full-width dark surface block listing development standards.
           Placed below the project grid before the about strip.
           ============================================================ */
        .standards {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin-top: 40px;
        }
        .standards h2 {
            font-size: 0.95rem;
            font-weight: 700;
            margin: 0 0 10px;
        }
        .standards ul {
            margin: 0;
            padding: 0 0 0 18px;
            color: var(--muted);
            font-size: 0.875rem;
        }
        .standards li { margin-bottom: 6px; }
        .standards strong { color: var(--fg); }

        /* ============================================================
           ABOUT STRIP
           Slim full-width row at the bottom of the page linking to the
           personal portfolio. Uses indigo border to visually distinguish
           it from project cards without overpowering them.
           ============================================================ */
        .about-strip {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            background: var(--surface);
            border: 1px solid var(--portfolio-border);
            border-radius: var(--radius);
            padding: 16px 20px;
            margin-top: 24px;
        }
        /* Left side: label pill + name + role */
        .about-left {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .about-name {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--fg);
        }
        .about-desc {
            font-size: 0.8rem;
            color: var(--muted);
        }
        /* Right side: quick links to portfolio, docs, and repository */
        .about-links {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .about-links a {
            font-size: 0.8rem;
            color: var(--link);
            text-decoration: none;
        }
        .about-links a:hover { text-decoration: underline; }

        /* ============================================================
           SITE FOOTER
           Two-column row with copyright on the left and contact links
           on the right. Populated via _config.yml (site.author, site.email).
           ============================================================ */
        .site-footer {
            border-top: 1px solid var(--line);
            margin-top: 48px;
            padding-top: 20px;
            color: var(--muted);
            font-size: 0.8rem;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
        }
        .site-footer a { color: var(--muted); text-decoration: none; }
        .site-footer a:hover { color: var(--link); }

        hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }

        /* ============================================================
           RESPONSIVE
           Below 620px: collapse grid to single column, reduce hero
           font size, and stack footer and about-strip vertically.
           ============================================================ */
        @media (max-width: 620px) {
            .grid { grid-template-columns: 1fr; }
            .hero h1 { font-size: 1.35rem; }
            .about-strip { flex-direction: column; align-items: flex-start; }
            .site-footer { flex-direction: column; }
        }