/* ============================================================
   INK & CODE — inkandcode.ai
   Cozy tech design system · matches the Ink & Code Substack
   Palette: post-it brights on warm paper (image_specs pen 31)
   ============================================================ */
:root {
    /* Ground */
    --bg: #FAFAF8;
    --surface: #FFFFFF;
    --ink: #1F2430;
    --muted: #5A5F6E;
    --border: #ECEAE4;

    /* Post-it brights */
    --pink: #EC4899;
    --blue: #3B82F6;
    --blue-deep: #2563EB;
    --orange: #F59E0B;
    --yellow: #FBBF24;
    --green: #10B981;
    --violet: #8B5CF6;
    --cyan: #06B6D4;

    /* Post-it tints (card washes) */
    --tint-yellow: #FEF6E0;
    --tint-pink: #FDEBF4;
    --tint-blue: #EAF2FE;
    --tint-green: #E7F8F1;
    --tint-violet: #F1ECFD;

    --font-head: 'Nunito', -apple-system, sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-note: 'Caveat', cursive;

    --shadow-soft: 0 2px 10px rgba(31, 36, 48, 0.06);
    --shadow-lift: 0 10px 30px rgba(31, 36, 48, 0.10);
    --radius: 14px;
    --max-width: 1160px;
    --nav-height: 74px;
}

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

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

body {
    font-family: var(--font-body);
    color: var(--ink);
    background-color: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main { flex: 1; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* ============ Typography ============ */
h1, h2, h3, h4 {
    font-family: var(--font-head);
    font-weight: 800;
    line-height: 1.15;
    color: var(--ink);
    margin-bottom: 1rem;
}
h1 { font-size: clamp(2.1rem, 4.5vw, 3.2rem); font-weight: 900; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.3rem; }
p  { margin-bottom: 1.25rem; color: var(--muted); }
a  { color: var(--blue-deep); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--pink); }

/* Handwritten kicker — the sticky-note voice */
.kicker {
    font-family: var(--font-note);
    font-size: 1.5rem;
    color: var(--pink);
    display: block;
    margin-bottom: .35rem;
    transform: rotate(-1.2deg);
}

/* The wordmark: Ink <&> Code */
.wordmark { font-family: var(--font-head); font-weight: 900; font-size: 1.5rem; letter-spacing: -0.01em; white-space: nowrap; }
.wordmark .wm-ink { color: var(--pink); }
.wordmark .wm-code { color: var(--blue); }
.wordmark .wm-lt { color: var(--blue); font-weight: 800; }
.wordmark .wm-gt { color: var(--orange); font-weight: 800; }
.wordmark .wm-amp { color: var(--ink); font-weight: 800; }

/* ============ Buttons ============ */
.btn {
    display: inline-block;
    font-family: var(--font-head);
    font-weight: 800;
    font-size: 1rem;
    padding: .8rem 1.7rem;
    border-radius: 999px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); color: #fff; }
.btn-pink { background: var(--pink); color: #fff; }
.btn-pink:hover { background: #DB2777; color: #fff; }
.btn-outline { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: #fff; }
.btn-lg { font-size: 1.1rem; padding: 1rem 2.2rem; }

/* ============ Header / Nav ============ */
header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(250, 250, 248, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}
.nav-container { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); gap: 1rem; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; list-style: none; }
.nav-links a { font-family: var(--font-head); font-weight: 700; color: var(--ink); font-size: 1rem; }
.nav-links a:hover { color: var(--pink); }
.nav-links a.active { color: var(--blue-deep); }
.nav-links .btn { font-size: .95rem; padding: .55rem 1.3rem; }
.nav-links .ext::after { content: " ↗"; font-size: .8em; color: var(--muted); }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.7rem; color: var(--ink); cursor: pointer; }

/* ============ Hero ============ */
.hero { padding: 4.5rem 0 3.5rem; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: center; }
.hero-text p.lead { font-size: 1.2rem; }
.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }
.hero-art img {
    width: 100%; border-radius: var(--radius);
    box-shadow: var(--shadow-lift);
    transform: rotate(1.2deg);
}
.hero-art { position: relative; }
.hero-art .tape {
    position: absolute; top: -14px; left: 50%; transform: translateX(-50%) rotate(-2deg);
    width: 110px; height: 28px; background: var(--pink); opacity: .55; border-radius: 3px; z-index: 2;
}

/* ============ Sections ============ */
.section { padding: 3.5rem 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 2.5rem; }

/* ============ Sticky-note cards ============ */
.card-grid { display: grid; gap: 1.5rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.note-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.8rem;
    box-shadow: var(--shadow-soft);
    transition: transform .2s ease, box-shadow .2s ease;
    position: relative;
}
.note-card:hover { transform: translateY(-4px) rotate(-.4deg); box-shadow: var(--shadow-lift); }
.note-card .emoji { font-size: 2rem; display: block; margin-bottom: .8rem; }
.note-card h3 { margin-bottom: .5rem; }
.note-card p { margin-bottom: 0; font-size: .97rem; }
.wash-yellow { background: var(--tint-yellow); }
.wash-pink { background: var(--tint-pink); }
.wash-blue { background: var(--tint-blue); }
.wash-green { background: var(--tint-green); }
.wash-violet { background: var(--tint-violet); }

/* ============ Substack feed cards ============ */
.post-card {
    display: flex; flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: transform .2s ease, box-shadow .2s ease;
    height: 100%;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.post-card .post-thumb {
    display: block; width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    border-bottom: 1px solid var(--border);
}
.post-card:hover .post-thumb { opacity: .93; }
.post-card .post-body { display: flex; flex-direction: column; flex: 1; padding: 1.2rem 1.5rem 1.5rem; }
.post-card .post-date { font-family: var(--font-note); font-size: 1.1rem; color: var(--orange); margin-bottom: .3rem; }
.post-card h3 { font-size: 1.12rem; margin-bottom: .4rem; }
.post-card h3 a { color: var(--ink); }
.post-card h3 a:hover { color: var(--blue-deep); }
.post-card p { font-size: .93rem; margin-bottom: 0; flex: 1; }

/* ============ Course cards ============ */
.course-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.6rem;
    box-shadow: var(--shadow-soft);
    display: flex; flex-direction: column; gap: .4rem;
    transition: transform .2s ease, box-shadow .2s ease;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.course-card h3 { margin-bottom: 0; font-size: 1.15rem; }
.course-card .tagline { font-size: .95rem; flex: 1; margin-bottom: .6rem; }
.badge {
    display: inline-block; align-self: flex-start;
    font-family: var(--font-head); font-weight: 800; font-size: .72rem;
    text-transform: uppercase; letter-spacing: .06em;
    padding: .25rem .7rem; border-radius: 999px; margin-bottom: .4rem;
}
.badge-live { background: var(--tint-green); color: #067857; }
.badge-soon { background: var(--tint-yellow); color: #92610A; }
.badge-free { background: var(--tint-blue); color: var(--blue-deep); }
.badge-adv { background: var(--tint-violet); color: #6D28D9; }
.badge-pre { background: var(--tint-pink); color: #BE185D; }

/* ============ Books / store ============ */
.book-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.book-card { text-align: center; }
.book-card img {
    width: 100%; max-width: 300px; border-radius: 10px;
    box-shadow: var(--shadow-lift);
    transition: transform .2s ease;
}
.book-card:hover img { transform: translateY(-6px) rotate(-.6deg); }
.book-card h3 { margin: 1.1rem 0 .3rem; font-size: 1.1rem; }
.book-card .book-sub { font-size: .92rem; margin-bottom: .8rem; }

/* ============ Cast strip ============ */
.cast-strip { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.cast-chip {
    background: var(--surface); border: 1px solid var(--border); border-radius: 999px;
    padding: .55rem 1.2rem; font-size: .95rem; box-shadow: var(--shadow-soft);
    font-family: var(--font-head); font-weight: 700; color: var(--ink);
}
.cast-chip span { margin-right: .35rem; }

/* ============ CTA band ============ */
.cta-band {
    background: linear-gradient(100deg, var(--tint-blue), var(--tint-pink) 60%, var(--tint-yellow));
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    border: 1px solid var(--border);
}
.cta-band h2 { margin-bottom: .6rem; }
.cta-band p { max-width: 560px; margin: 0 auto 1.5rem; }

/* ============ Footer ============ */
footer { background: var(--surface); border-top: 1px solid var(--border); padding: 2.5rem 0 2rem; margin-top: 3rem; }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap; }
.footer-tagline { font-family: var(--font-note); font-size: 1.4rem; color: var(--pink); margin-bottom: .3rem; }
.footer-links { display: flex; gap: 1.4rem; list-style: none; flex-wrap: wrap; }
.footer-links a { font-size: .93rem; color: var(--muted); }
.footer-links a:hover { color: var(--pink); }
.footer-legal { font-size: .85rem; color: var(--muted); margin-top: 1.5rem; margin-bottom: 0; }
.footer-coffee { font-size: .9rem; color: var(--muted); margin-bottom: 0; }

/* ============ Responsive ============ */
@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .book-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
    .nav-links {
        display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
        background: var(--bg); flex-direction: column; padding: 1.2rem;
        border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lift);
    }
    .nav-links.open { display: flex; }
    .mobile-menu-btn { display: block; }
    .grid-3, .grid-2, .book-grid { grid-template-columns: 1fr; }
    .hero { padding: 3rem 0 2.5rem; }
}