/* Luke Portfolio — CHROMIA inspired (playful, bold, colorful) */
:root {
    --bg: #f8f1f2;
    --bg-alt: #ffffff;
    --bg-dark: #17111b;
    --text: #1f1a23;
    --text-dim: #17111b;
    --text-light: #fff8f8;
    --accent: #4fcd4c;
    --accent-2: #cc91f0;
    --accent-3: #ff87a6;
    --muted: rgba(31,26,35,0.55);
    --dim: rgba(31,26,35,0.35);
    --border: rgba(31,26,35,0.14);
    --border-strong: rgba(31,26,35,0.4);
    --code-bg: #17111b;
    --output-bg: #1f1a23;
    --font-sans: "Inter", "Helvetica Neue", Arial, sans-serif;
    --font-display: "Archivo Black", "Inter", sans-serif;
    --font-mono: "JetBrains Mono", "Courier New", monospace;
    --radius: 16px;
    --radius-sm: 10px;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body {
    background: var(--bg); color: var(--text); font-family: var(--font-sans);
    font-size: 16px; line-height: 1.6; font-weight: 400;
    -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 400; letter-spacing: -0.03em; line-height: 0.95; text-wrap: balance; text-transform: none; }
p { text-wrap: pretty; }

/* NAV */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.1rem 5vw;
    background: color-mix(in oklab, var(--bg) 88%, transparent);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}
.nav-brand {
    font-family: var(--font-display);
    font-weight: 700; font-size: 24px;
    letter-spacing: -0.04em; color: var(--text);
}
.nav-links { display: flex; gap: 1.75rem; list-style: none; align-items: center; }
.nav-links a {
    color: var(--text); transition: color .2s; font-weight: 500;
    font-size: 14px;
}
.nav-links a:hover { color: var(--accent); }
.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); margin: 4px 0; transition: all .3s; border-radius: 2px; }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0%; background: var(--accent); z-index: 200; }

/* HERO */
.tut-hero { padding: 170px 5vw 70px; }
.tut-hero .label {
    font-family: var(--font-mono); font-size: 12px; font-weight: 500;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text); background: var(--accent);
    display: inline-block; padding: 0.4rem 0.9rem; border-radius: 100px;
    margin-bottom: 2rem;
}
.tut-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(52px, 10vw, 128px);
    font-weight: 400; line-height: 0.9; letter-spacing: -0.04em;
    margin-bottom: 2rem; max-width: 16ch;
}
.tut-hero h1 em { font-style: normal; color: var(--accent); }
.tut-hero p { max-width: 60ch; color: var(--text-dim); font-size: 18px; line-height: 1.6; }
.tut-meta { display: flex; gap: 1rem; margin-top: 2.5rem; flex-wrap: wrap; }
.tut-meta span {
    font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
    letter-spacing: 0.05em; color: var(--text); background: var(--bg-alt);
    padding: 0.5rem 0.9rem; border-radius: 100px; border: 1px solid var(--border);
}
.tut-meta b { color: var(--text); font-weight: 700; }

/* TLDR */
.tldr {
    background: var(--accent-2);
    border-radius: var(--radius);
    padding: 2rem 2.5rem; margin: 2.5rem 5vw; max-width: 1200px;
}
.tldr-label {
    font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text); display: block; margin-bottom: 1rem;
    font-weight: 600;
}
.tldr p { color: var(--text); font-size: 16px; line-height: 1.65; }
.tldr p strong { color: var(--text); font-weight: 700; }

/* STEP (Layout C) */
.step { padding: 4.5rem 5vw 3.5rem; max-width: 1400px; }
.step-head { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 2rem; flex-wrap: wrap; }
.step-num {
    font-family: var(--font-mono); font-size: 13px; color: var(--text);
    background: var(--accent); padding: 0.5rem 1rem; border-radius: 100px;
    letter-spacing: 0.03em; font-weight: 600; text-transform: uppercase;
}
.step-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 700; line-height: 1.0; letter-spacing: -0.03em;
}
.step-body { max-width: 75ch; }
.step-body p { margin-bottom: 1.25rem; color: var(--text-dim); font-size: 16px; line-height: 1.7; }
.step-body p strong { color: var(--text); font-weight: 600; }
.step-body a { color: var(--text); border-bottom: 2px solid var(--accent); transition: background .2s; padding-bottom: 1px; }
.step-body a:hover { background: var(--accent); }
.step-body ol, .step-body ul { margin: 1rem 0 1.5rem 1.5rem; }
.step-body li { color: var(--text-dim); margin-bottom: 0.5rem; line-height: 1.7; }

/* INSIGHT / CALLOUT */
.insight {
    border-radius: var(--radius-sm); padding: 1.25rem 1.5rem; margin: 1.5rem 0;
    background: var(--accent-2);
}
.insight p { color: var(--text) !important; margin: 0 !important; font-size: 15px !important; }
.insight.warn { background: var(--accent-3); }
.insight.warn .insight-label { color: var(--text); }
.insight-label {
    font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text); display: block; margin-bottom: 0.5rem;
    font-weight: 600;
}

/* CODE BLOCK — macOS Terminal Style */
.code-block {
    background: var(--code-bg); border-radius: 10px;
    margin: 1.75rem 0; overflow: hidden; position: relative;
    box-shadow: 0 12px 32px -8px rgba(31,26,35,0.18), 0 2px 6px rgba(31,26,35,0.08);
    border: 1px solid rgba(255,248,248,0.06);
    padding: 0;
}
.code-block::before {
    content: ""; display: block; height: 32px;
    background: linear-gradient(180deg, #2a2230 0%, #1f1a23 100%);
    border-bottom: 1px solid rgba(255,248,248,0.08);
}
.code-block::after {
    content: ""; position: absolute; top: 11px; left: 14px;
    width: 12px; height: 12px; border-radius: 50%;
    background: #ff5f57;
    box-shadow:
        20px 0 0 #febc2e,
        40px 0 0 #28c840;
}
.code-block .lang {
    position: absolute; top: 0; left: 0; right: 0; height: 32px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-mono); font-size: 11px;
    color: rgba(255,248,248,0.45); letter-spacing: 0.02em;
    pointer-events: none; user-select: none;
}
.code-block .lang::before { content: "⌘ "; opacity: 0.6; margin-right: 4px; }
.code-block code {
    font-family: var(--font-mono); font-size: 13px; line-height: 1.75;
    color: var(--text-light); white-space: pre; display: block;
    padding: 1.25rem 1.5rem 1.5rem;
    overflow-x: auto;
}
.code-block .pr { color: var(--accent); }
.code-block .cm { color: rgba(255,248,248,0.4); font-style: italic; }
.code-block .st { color: var(--accent); }
.code-block .kw { color: var(--accent-3); font-weight: 500; }
.code-block .vl { color: var(--accent-2); }
/* Blinking cursor at end */
.code-block code::after {
    content: "▋"; color: var(--accent); margin-left: 4px;
    animation: blink 1s step-end infinite;
    font-weight: 100;
}
@keyframes blink { 50% { opacity: 0; } }
/* Subtle hover glow */
.code-block { transition: box-shadow .3s, transform .3s; }
.code-block:hover {
    box-shadow: 0 16px 40px -8px rgba(79,205,76,0.18), 0 2px 6px rgba(31,26,35,0.08);
    transform: translateY(-1px);
}

/* EXPECTED OUTPUT */
.output {
    background: var(--output-bg); border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.5rem; margin: 1rem 0;
    font-family: var(--font-mono); font-size: 12px; line-height: 1.7;
    color: rgba(255,248,248,0.85); white-space: pre-wrap;
}
.output-label {
    display: block; font-size: 10px; text-transform: uppercase;
    letter-spacing: 0.05em; color: var(--accent); margin-bottom: 0.5rem; font-weight: 600;
}

/* PITFALLS */
.pitfalls {
    padding: 5rem 5vw; background: var(--bg-dark); border-radius: var(--radius);
    margin: 2rem 3vw;
}
.pitfalls h2 {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 60px);
    font-weight: 700; letter-spacing: -0.03em;
    margin-bottom: 0.5rem; line-height: 1.0; color: var(--text-light);
}
.pitfalls h2 em { color: var(--accent); font-style: normal; }
.pitfalls > p { color: rgba(255,248,248,0.6) !important; }
.pitfalls .pf-tag {
    font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text); background: var(--accent);
    padding: 0.4rem 0.9rem; border-radius: 100px; margin-bottom: 1.5rem;
    display: inline-block; font-weight: 600;
}
.pf-list { margin-top: 2.5rem; display: grid; gap: 1rem; }
.pf-item {
    border-radius: var(--radius-sm); padding: 1.5rem 1.75rem;
    background: rgba(255,248,248,0.05); border: 1px solid rgba(255,248,248,0.1);
    transition: background .2s;
}
.pf-item:hover { background: rgba(255,248,248,0.09); }
.pf-item h4 { font-family: var(--font-display); font-size: 19px; font-weight: 600; margin-bottom: 0.6rem; letter-spacing: -0.01em; color: var(--text-light); }
.pf-item h4::before { content: ""; display: inline-block; width: 8px; height: 8px; background: var(--accent-3); border-radius: 50%; margin-right: 0.6rem; vertical-align: middle; }
.pf-item p { color: rgba(255,248,248,0.6); font-size: 14px; line-height: 1.7; }
.pf-item p code {
    background: rgba(255,248,248,0.1); padding: 0.15rem 0.4rem; border-radius: 4px;
    font-family: var(--font-mono); font-size: 12px; color: var(--accent);
}

/* TUTORIALS INDEX */
.tut-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; margin: 2.5rem 5vw; }
.tut-card {
    background: var(--bg-alt); border-radius: var(--radius);
    padding: 2.5rem 3rem; display: grid; grid-template-columns: auto 1fr auto;
    gap: 2rem; align-items: center; transition: transform .2s, box-shadow .2s;
    border: 1px solid var(--border);
}
.tut-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(31,26,35,0.1); }
.tut-card .num {
    font-family: var(--font-mono); font-size: 13px; color: var(--text);
    background: var(--accent); padding: 0.6rem 1rem; border-radius: 100px;
    font-weight: 600;
}
.tut-card h3 {
    font-family: var(--font-display); font-size: 26px; font-weight: 700;
    line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 0.5rem;
}
.tut-card p { font-size: 15px; color: var(--text-dim); line-height: 1.55; }
.tut-card .meta {
    font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
    letter-spacing: 0.05em; color: var(--text-dim);
    background: var(--bg); padding: 0.5rem 0.85rem; border-radius: 100px;
    white-space: nowrap;
}

/* FOOTER */
.footer {
    padding: 3rem 5vw; border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
    font-family: var(--font-mono); font-size: 11px;
    text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted);
    flex-wrap: wrap; gap: 1rem;
}
.footer a { color: var(--text); transition: color .2s; }
.footer a:hover { color: var(--accent); }

/* ANIMATIONS */
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity .6s ease-out, transform .6s ease-out; }
.fade-in.vis { opacity: 1; transform: translateY(0); }

/* RESPONSIVE */
@media (max-width: 768px) {
    .nav { padding: 1rem 5vw; }
    .nav-links {
        display: none; position: absolute; top: 60px; left: 0; right: 0;
        background: color-mix(in oklab, var(--bg) 96%, transparent);
        backdrop-filter: blur(14px);
        flex-direction: column; padding: 1.5rem 5vw; gap: 1.25rem;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.active { display: flex; }
    .hamburger { display: block; }
    .tut-card { grid-template-columns: 1fr; gap: 0.75rem; padding: 2rem; }
    .tut-card .meta { justify-self: start; }
    .tut-hero { padding: 130px 5vw 50px; }
    .step { padding: 3rem 5vw 2.5rem; }
    .pitfalls { padding: 3rem 5vw; margin: 1rem; }
    .footer { flex-direction: column; gap: 1rem; text-align: center; }
}

/* Chromia letter-spread on scroll */
.spread-on-scroll { transition: letter-spacing .15s linear, opacity .15s linear; white-space: nowrap; will-change: letter-spacing; }
@media (max-width: 768px) { .spread-on-scroll { white-space: normal; } }