import { hslToHex } from "./design.js";
import type { Tokens } from "./types.js";

export function buildCss(tokens: Tokens): string {
  return `/* Generated by the one-page-website skill. Design tokens live in :root. */

:root {
  color-scheme: light dark;

  --font-display: ${tokens.fontDisplay};
  --font-sans: ${tokens.fontSans};
  --font-mono: ${tokens.fontMono};

  --heading-weight: ${tokens.headingWeight};
  --heading-tracking: ${tokens.headingTracking};
  --measure: ${tokens.measure};

  --radius: ${tokens.radius};
  --radius-lg: ${tokens.radiusLg};

  --accent: ${tokens.accent};
  --accent-contrast: ${tokens.accentContrast};
  --accent-soft: ${hslToHex(tokens.hue, 0.7, 0.94)};
  --accent-strong: ${hslToHex(tokens.hue, 0.72, 0.34)};

  --bg: #FFFFFF;
  --bg-alt: ${hslToHex(tokens.hue, 0.32, 0.975)};
  --surface: #FFFFFF;
  --border: ${hslToHex(tokens.hue, 0.18, 0.88)};
  --text: ${hslToHex(tokens.hue, 0.26, 0.12)};
  --muted: ${hslToHex(tokens.hue, 0.12, 0.42)};
  --shadow: 0 1px 2px rgba(15, 20, 30, 0.06), 0 12px 32px -18px rgba(15, 20, 30, 0.28);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --container: 1140px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: ${hslToHex(tokens.hue, 0.72, 0.62)};
    --accent-contrast: #0B0E14;
    --accent-soft: ${hslToHex(tokens.hue, 0.4, 0.2)};
    --accent-strong: ${hslToHex(tokens.hue, 0.7, 0.72)};

    --bg: ${hslToHex(tokens.hue, 0.16, 0.07)};
    --bg-alt: ${hslToHex(tokens.hue, 0.15, 0.1)};
    --surface: ${hslToHex(tokens.hue, 0.14, 0.12)};
    --border: ${hslToHex(tokens.hue, 0.12, 0.24)};
    --text: #EEF1F6;
    --muted: ${hslToHex(tokens.hue, 0.1, 0.68)};
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 18px 40px -24px rgba(0, 0, 0, 0.8);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: var(--heading-weight);
  letter-spacing: var(--heading-tracking);
  line-height: 1.15;
  margin: 0 0 var(--space-4);
  text-wrap: balance;
}

h1 { font-size: clamp(2.25rem, 1.6rem + 3.1vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 1.4rem + 1.6vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 1.05rem + 0.35vw, 1.3rem); }
p  { margin: 0 0 var(--space-4); }

a { color: var(--accent-strong); }
a:hover { color: var(--accent); }

:where(a, button, summary, input, [tabindex]):focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100%;
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section { padding-block: var(--space-16); }
.section--alt { background: var(--bg-alt); }
.section__head { max-width: var(--measure); margin-bottom: var(--space-12); }
.section__eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.lede { font-size: 1.125rem; color: var(--muted); max-width: var(--measure); }

/* ---- header ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(180%) blur(12px);
  transition: border-color 150ms ease;
}
.site-header[data-scrolled="true"] { border-bottom-color: var(--border); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-family: var(--font-display);
  letter-spacing: var(--heading-tracking);
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: 0.9rem;
  font-weight: 800;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  cursor: pointer;
}
.nav-toggle__bars { display: block; width: 1rem; height: 2px; background: currentColor; box-shadow: 0 5px currentColor, 0 -5px currentColor; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__list a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}
.site-nav__list a:hover { color: var(--text); }
.site-nav__list a[aria-current="true"] { color: var(--text); }

/* ---- buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-contrast); }
.btn--primary:hover { background: var(--accent-strong); color: var(--accent-contrast); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { background: var(--bg-alt); color: var(--text); }
.btn--sm { padding: 0.5rem 0.875rem; font-size: 0.875rem; }

/* ---- hero ---- */

.hero { padding-block: var(--space-24) var(--space-16); }
.hero__grid { display: grid; gap: var(--space-12); align-items: center; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.8125rem;
  font-weight: 600;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }
.hero__note { margin-top: var(--space-4); font-size: 0.875rem; color: var(--muted); }
.hero__panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: var(--space-6);
}
.hero__panel-bar { display: flex; gap: var(--space-2); margin-bottom: var(--space-6); }
.hero__panel-bar span { width: 0.625rem; height: 0.625rem; border-radius: 999px; background: var(--border); }
.hero__panel-row { display: flex; align-items: center; gap: var(--space-4); padding-block: var(--space-3); border-top: 1px solid var(--border); }
.hero__panel-row:first-of-type { border-top: 0; }
.hero__panel-key { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--muted); }
.hero__panel-val { margin-left: auto; font-weight: 700; }

/* ---- features ---- */

.grid { display: grid; gap: var(--space-6); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }

.card {
  padding: var(--space-6);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}
.card__icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: var(--space-4);
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.card p:last-child { margin-bottom: 0; }

/* ---- proof ---- */

.stats { display: grid; gap: var(--space-6); grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); margin-bottom: var(--space-12); }
.stat__value { font-family: var(--font-display); font-size: clamp(2rem, 1.5rem + 2vw, 3rem); font-weight: var(--heading-weight); letter-spacing: var(--heading-tracking); line-height: 1; }
.stat__label { margin-top: var(--space-2); color: var(--muted); font-size: 0.9375rem; }

.quote {
  margin: 0;
  padding: var(--space-8);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  background: var(--surface);
}
.quote p { font-size: 1.125rem; max-width: var(--measure); }
.quote footer { color: var(--muted); font-size: 0.9375rem; }

/* ---- pricing ---- */

.tier { display: flex; flex-direction: column; }
.tier--featured { border-color: var(--accent); box-shadow: var(--shadow); }
.tier__badge { display: inline-block; margin-bottom: var(--space-3); padding: 0.15rem 0.6rem; border-radius: 999px; background: var(--accent); color: var(--accent-contrast); font-size: 0.75rem; font-weight: 700; }
.tier__price { display: flex; align-items: baseline; gap: var(--space-2); margin-block: var(--space-4); }
.tier__amount { font-family: var(--font-display); font-size: 2.25rem; font-weight: var(--heading-weight); letter-spacing: var(--heading-tracking); }
.tier__cadence { color: var(--muted); font-size: 0.875rem; }
.tier__list { list-style: none; margin: 0 0 var(--space-6); padding: 0; display: grid; gap: var(--space-2); }
.tier__list li { position: relative; padding-left: 1.5rem; font-size: 0.9375rem; }
.tier__list li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 0.5rem; height: 0.5rem; border-radius: 999px; background: var(--accent); }
.tier .btn { margin-top: auto; }

/* ---- faq ---- */

.faq { display: grid; gap: var(--space-3); max-width: 52rem; }
.faq__item { border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); }
.faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; font-family: var(--font-mono); font-size: 1.25rem; color: var(--muted); }
.faq__item[open] summary::after { content: "\\2212"; }
.faq__answer { padding: 0 var(--space-6) var(--space-6); color: var(--muted); max-width: var(--measure); }

/* ---- cta ---- */

.cta-band {
  padding: var(--space-16) var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--accent);
  color: var(--accent-contrast);
  text-align: center;
}
.cta-band h2 { color: inherit; }
.cta-band p { color: inherit; opacity: 0.9; max-width: var(--measure); margin-inline: auto; }
.cta-band .btn--primary { background: var(--accent-contrast); color: var(--accent); }
.cta-band .btn--primary:hover { background: var(--accent-contrast); opacity: 0.9; color: var(--accent); }

/* ---- rich text (from --copy) ---- */

.rich-text { max-width: var(--measure); }
.rich-text > :last-child { margin-bottom: 0; }
.rich-text ul, .rich-text ol { padding-left: 1.25rem; margin: 0 0 var(--space-4); }
.rich-text li { margin-bottom: var(--space-2); }
.rich-text code { font-family: var(--font-mono); font-size: 0.9em; background: var(--bg-alt); padding: 0.1em 0.35em; border-radius: 4px; }
.rich-text pre { overflow-x: auto; padding: var(--space-4); background: var(--bg-alt); border-radius: var(--radius); }
.rich-text blockquote { margin: 0 0 var(--space-4); padding-left: var(--space-4); border-left: 3px solid var(--border); color: var(--muted); }
.rich-text table { width: 100%; border-collapse: collapse; }
.rich-text th, .rich-text td { text-align: left; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--border); }

/* ---- footer ---- */

.site-footer { padding-block: var(--space-12); border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9375rem; }
.site-footer__inner { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; justify-content: space-between; }
.site-footer ul { display: flex; flex-wrap: wrap; gap: var(--space-6); margin: 0; padding: 0; list-style: none; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ---- responsive ---- */

@media (min-width: 60rem) {
  .hero__grid { grid-template-columns: 1.05fr 0.95fr; }
  .section { padding-block: var(--space-24); }
}

@media (max-width: 52rem) {
  .site-header__inner { flex-wrap: wrap; }
  .site-nav { flex-basis: 100%; }
  .site-nav__list { flex-direction: column; align-items: flex-start; gap: var(--space-2); padding-bottom: var(--space-4); }

  /* Without JavaScript the menu stays open; the toggle only exists for the JS path. */
  html.js .nav-toggle { display: inline-flex; }
  html.js .site-nav { display: none; }
  html.js .site-nav[data-open="true"] { display: block; }
}

@media print {
  .site-header, .nav-toggle, .skip-link { display: none; }
  .section { padding-block: var(--space-8); }
}
`;
}

/* ------------------------------------------------------------------ */
/* script                                                              */
/* ------------------------------------------------------------------ */

export function buildJs(): string {
  return `/* Generated by the one-page-website skill.
   Progressive enhancement only: every behaviour below is an upgrade on markup
   that already works with JavaScript disabled. */
(function () {
  "use strict";

  var doc = document;
  var reduceMotion = window.matchMedia("(prefers-reduced-motion: reduce)");

  /* ---- mobile navigation ---- */
  var toggle = doc.querySelector(".nav-toggle");
  var nav = doc.getElementById("site-nav");

  function closeNav() {
    if (!toggle || !nav) return;
    toggle.setAttribute("aria-expanded", "false");
    nav.setAttribute("data-open", "false");
  }

  if (toggle && nav) {
    toggle.hidden = false;
    closeNav();
    toggle.addEventListener("click", function () {
      var open = toggle.getAttribute("aria-expanded") === "true";
      toggle.setAttribute("aria-expanded", open ? "false" : "true");
      nav.setAttribute("data-open", open ? "false" : "true");
    });
    doc.addEventListener("keydown", function (event) {
      if (event.key === "Escape") closeNav();
    });
  }

  /* ---- smooth scroll + focus management ---- */
  doc.addEventListener("click", function (event) {
    var link = event.target && event.target.closest ? event.target.closest('a[href^="#"]') : null;
    if (!link) return;
    var id = link.getAttribute("href").slice(1);
    if (!id) return;
    var target = doc.getElementById(id);
    if (!target) return;

    event.preventDefault();
    closeNav();
    target.scrollIntoView({ behavior: reduceMotion.matches ? "auto" : "smooth", block: "start" });

    // Move focus so keyboard and screen reader users land where sighted users do.
    if (!target.hasAttribute("tabindex")) target.setAttribute("tabindex", "-1");
    target.focus({ preventScroll: true });

    if (history.replaceState) history.replaceState(null, "", "#" + id);
  });

  /* ---- FAQ accordion: keep one open at a time ---- */
  var faqItems = Array.prototype.slice.call(doc.querySelectorAll(".faq__item"));
  faqItems.forEach(function (item) {
    item.addEventListener("toggle", function () {
      if (!item.open) return;
      faqItems.forEach(function (other) {
        if (other !== item) other.open = false;
      });
    });
  });

  /* ---- header shadow on scroll ---- */
  var header = doc.querySelector(".site-header");
  if (header) {
    var onScroll = function () {
      header.setAttribute("data-scrolled", window.scrollY > 8 ? "true" : "false");
    };
    onScroll();
    window.addEventListener("scroll", onScroll, { passive: true });
  }

  /* ---- scrollspy on the nav ---- */
  var navLinks = Array.prototype.slice.call(doc.querySelectorAll('#site-nav a[href^="#"]'));
  if (navLinks.length && "IntersectionObserver" in window) {
    var sections = navLinks
      .map(function (link) { return doc.getElementById(link.getAttribute("href").slice(1)); })
      .filter(Boolean);

    var observer = new IntersectionObserver(function (entries) {
      entries.forEach(function (entry) {
        if (!entry.isIntersecting) return;
        navLinks.forEach(function (link) {
          var active = link.getAttribute("href") === "#" + entry.target.id;
          if (active) link.setAttribute("aria-current", "true");
          else link.removeAttribute("aria-current");
        });
      });
    }, { rootMargin: "-45% 0px -50% 0px", threshold: 0 });

    sections.forEach(function (section) { observer.observe(section); });
  }
})();
`;
}

/* ------------------------------------------------------------------ */
/* html                                                                */
/* ------------------------------------------------------------------ */