// Skin · Ingredients · Chemical Exfoliants — L3 data (COMBINED PAGE: #aha, #bha, #choosing)
// Visual skeleton must match the Oily prototype exactly. Vary copy, never layout.

const OILY = {
  type: "Chemical Exfoliants",
  parent: { title: "Ingredients", href: "/en/skin/ingredients/" },
  grandparent: { title: "Skin", href: "/en/skin/" },
  totalCount: 151,
  hero: "https://images.unsplash.com/photo-1570194065650-d99fb4bedf0a?w=1800&q=80&auto=format&fit=crop",
  heroAlt: "Editorial close-up — chemical exfoliant texture on skin",
  h1: "How to use chemical exfoliants.",
  deck: "AHAs, BHAs, and how to choose between them. The category where more is not more — and where twice a week is usually the ceiling.",
  intro: "Chemical exfoliants are not the more-is-more category. Twice a week is the ceiling for most faces. The AHA group — glycolic, lactic, mandelic — work on the surface and the upper layers of the epidermis, loosening the bonds between dead cells. The BHA, salicylic acid, goes into the pore. These are different mechanisms, not different intensities. Getting the category right means knowing which problem you're working on: surface texture, tone, and fine lines respond to AHAs; congestion, blackheads, and oily skin respond to BHAs. Some people use both. Most don't need to. Below is everything we've published — including how to decide which to reach for first.",
  byline: "Edited by Nelly · Beauty & Style Director",
  meta: { count: 151, updated: "Updated 27 April 2026", reading: "Avg. 4 min per piece" },
};

// Ingredients sibling rail — 9 siblings under /en/skin/ingredients/
const TYPE_SIBLINGS = [
  { id: "niacinamide",             title: "Niacinamide",            n: "01", href: "/en/skin/ingredients/niacinamide/" },
  { id: "vitamin-c",               title: "Vitamin C",              n: "02", href: "/en/skin/ingredients/vitamin-c/" },
  { id: "retinoids",               title: "Retinoids",              n: "03", href: "/en/skin/ingredients/retinoids/" },
  { id: "chemical-exfoliants",     title: "Chemical Exfoliants",    n: "04", cur: true, href: "/en/skin/ingredients/chemical-exfoliants/" },
  { id: "ceramides",               title: "Ceramides",              n: "05", href: "/en/skin/ingredients/ceramides/" },
  { id: "peptides",                title: "Peptides",               n: "06", href: "/en/skin/ingredients/peptides/" },
  { id: "humectants-vs-emollients", title: "Humectants vs Emollients", n: "07", href: "/en/skin/ingredients/humectants-vs-emollients/" },
  { id: "the-brightening-pair",    title: "The Brightening Pair",   n: "08", href: "/en/skin/ingredients/the-brightening-pair/" },
  { id: "spf-filters",             title: "SPF Filters",            n: "09", href: "/en/skin/ingredients/spf-filters/" },
];

const QUICK_FACTS = {
  defn: {
    h: "What chemical exfoliation actually is",
    // Combined page: real anchor sub-topics land in sections; QUICK_FACTS gives the overarching definition
    body: "Chemical exfoliation uses acids — or, in the case of PHA, lactobionic acid — to loosen and dissolve the bonds between dead skin cells, rather than scrubbing them off. The result, done correctly, is smoother texture and more even tone. Done too often, it's barrier damage that takes weeks to repair. The job of this page is to tell you which acid, how often, and when to use both at once.",
  },
  myths: [
    { m: "More exfoliation gives faster results.",
      t: "It accelerates barrier breakdown, not cell turnover. You'll feel raw before you feel smooth. Two nights a week is a ceiling, not a starting point." },
    { m: "AHAs and BHAs do the same thing.",
      t: "AHAs exfoliate the surface. BHAs go into the pore. Same category, different targets. Which you need depends on what you're working on." },
    { m: "Chemical exfoliants make your skin thinner.",
      t: "Controlled exfoliation over time increases cell turnover and can thicken the epidermis. Over-exfoliation thins it. Cadence is everything." },
  ],
};

const BEGINNER_PATH = {
  h: "Start here, if chemical exfoliants are new to you.",
  deck: "Five pieces, in order. The AHA path first, then BHA, then how to combine them if you need to.",
  steps: [
    { n: "01", t: "AHAs: glycolic, lactic, mandelic — what makes each different",    time: "5 min", note: "Surface exfoliants. Molecule size, skin sensitivity, and which to start with." },
    { n: "02", t: "BHA: salicylic acid — the pore-focused one",                      time: "4 min", note: "Oil-soluble, pore-penetrating. Who it's for." },
    { n: "03", t: "How often to exfoliate — the honest answer",                      time: "3 min", note: "Twice a week, most faces. Why less is more." },
    { n: "04", t: "Choosing between AHA and BHA",                                    time: "4 min", note: "Surface texture vs congestion. Most people need one, not both." },
    { n: "05", t: "Chemical exfoliants with retinoids — the alternating schedule",    time: "4 min", note: "Not on the same night. The sensible way to run both." },
  ],
};

const TRENDING = [
  { rank: "01", t: "Glycolic vs lactic acid — which is gentler", time: "4 min", auth: "Nelly", date: "Apr 25", img: "https://images.unsplash.com/photo-1570194065650-d99fb4bedf0a?w=1100&q=80&auto=format&fit=crop", reads: "13,799" },
  { rank: "02", t: "Salicylic acid for blackheads — the correct use", time: "4 min", auth: "Iris",  date: "Apr 21", img: "https://images.unsplash.com/photo-1598440947619-2c35fc9aa908?w=1100&q=80&auto=format&fit=crop", reads: "11,432" },
  { rank: "03", t: "Can you use AHAs and BHAs in the same routine", time: "5 min", auth: "Nelly", date: "Apr 16", img: "https://images.unsplash.com/photo-1556228852-80b6e5eeff06?w=1100&q=80&auto=format&fit=crop", reads: "9,056" },
  { rank: "04", t: "Mandelic acid — the sensitive skin exfoliant", time: "4 min", auth: "Iris",  date: "Apr 11", img: "https://images.unsplash.com/photo-1571875257727-256c39da42af?w=1100&q=80&auto=format&fit=crop", reads: "7,244" },
  { rank: "05", t: "How often is too often with exfoliants", time: "3 min", auth: "Nelly", date: "Apr 06", img: "https://images.unsplash.com/photo-1512290923902-8a9f81dc236c?w=1100&q=80&auto=format&fit=crop", reads: "6,011" },
];

const FORMAT_GUIDE = {
  h: "Format & cadence, by use case",
  deck: "AHA or BHA, in which format, how often. The right answer depends on what you're targeting.",
  formats: [
    { name: "Glycolic acid toner",  when: "2× week PM, normal to oily, texture + tone", avoid: "Sensitive skin, broken barrier", note: "Smallest AHA molecule, deepest penetration. Most studied. More sensitising.", verdict: "Surface texture" },
    { name: "Lactic acid toner",    when: "2× week PM, dry to normal, gentle brightening", avoid: "Stacking with glycolic same night", note: "Larger molecule, gentler. Also a humectant — a good AHA for drier skin.", verdict: "Gentler AHA" },
    { name: "Mandelic acid",        when: "2× week PM, sensitive or darker skin tones",   avoid: "Expecting glycolic-speed results", note: "Largest AHA, slowest, gentlest. Well-tolerated on reactive skin.", verdict: "★ Sensitive skin" },
    { name: "Salicylic acid 0.5–2%", when: "2× week PM, oily or congested skin",          avoid: "Dry or dehydrated skin as main exfoliant", note: "Goes into the pore. The right choice if congestion, not texture, is the problem.", verdict: "★ Congestion" },
    { name: "AHA + BHA combination", when: "Once a week, experienced users",              avoid: "More than once weekly, sensitive skin", note: "Some products combine low percentages. Use once, not twice a week.", verdict: "Advanced, occasionally" },
    { name: "Leave-on vs rinse-off", when: "Leave-on for daily-use low-concentration",   avoid: "High-concentration leave-on nightly", note: "Rinse-offs are for higher concentrations with limited exposure time.", verdict: "Depends on %" },
  ],
};

const HOWTOS = [
  { t: "Glycolic vs lactic acid — which to start with", time: 4, tech: "Serums", auth: "Nelly", date: "Apr 25", img: "https://images.unsplash.com/photo-1570194065650-d99fb4bedf0a?w=900&q=80&auto=format&fit=crop", kick: "Ingredients", pick: true },
  { t: "Salicylic acid for blackheads — the correct approach", time: 4, tech: "Serums", auth: "Iris", date: "Apr 21", img: "https://images.unsplash.com/photo-1598440947619-2c35fc9aa908?w=900&q=80&auto=format&fit=crop", kick: "Ingredients", pick: true },
  { t: "AHAs and BHAs in the same routine — how to manage it", time: 5, tech: "Layering", auth: "Nelly", date: "Apr 16", img: "https://images.unsplash.com/photo-1556228852-80b6e5eeff06?w=900&q=80&auto=format&fit=crop", kick: "Layering", pick: true },
  { t: "Mandelic acid — the exfoliant for sensitive skin", time: 4, tech: "Serums", auth: "Iris", date: "Apr 11", img: "https://images.unsplash.com/photo-1571875257727-256c39da42af?w=900&q=80&auto=format&fit=crop", kick: "Ingredients", pick: true },
  { t: "How often to exfoliate — the plain-English answer", time: 3, tech: "Routine", auth: "Nelly", date: "Apr 06", img: "https://images.unsplash.com/photo-1512290923902-8a9f81dc236c?w=900&q=80&auto=format&fit=crop", kick: "Routine", pick: true },
  { t: "Salicylic acid concentration — 0.5% vs 2%", time: 3, tech: "Essay", auth: "Iris", date: "Apr 01", img: "https://images.unsplash.com/photo-1607006344380-b6775a0824a4?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "Chemical exfoliants with retinoids — the schedule", time: 5, tech: "Layering", auth: "Nelly", date: "Mar 27", img: "https://images.unsplash.com/photo-1601049541289-9b1b7bbbfe19?w=900&q=80&auto=format&fit=crop", kick: "Layering", pick: false },
  { t: "Signs you're over-exfoliating", time: 3, tech: "Troubleshoot", auth: "Iris", date: "Mar 22", img: "https://images.unsplash.com/photo-1556228720-195a672e8a03?w=900&q=80&auto=format&fit=crop", kick: "Troubleshoot", pick: false },
  { t: "Lactic acid for dry skin — why it works twice", time: 4, tech: "Essay", auth: "Nelly", date: "Mar 17", img: "https://images.unsplash.com/photo-1570194065650-d99fb4bedf0a?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "Glycolic acid toner — the most common mistakes", time: 4, tech: "Troubleshoot", auth: "Iris", date: "Mar 12", img: "https://images.unsplash.com/photo-1583416750470-965b2707b355?w=900&q=80&auto=format&fit=crop", kick: "Troubleshoot", pick: false },
  { t: "BHA for oily skin — a focused routine", time: 4, tech: "Routine", auth: "Nelly", date: "Mar 07", img: "https://images.unsplash.com/photo-1556228578-8c89e6adf883?w=900&q=80&auto=format&fit=crop", kick: "Routine", pick: false },
  { t: "Choosing between glycolic and mandelic", time: 4, tech: "Essay", auth: "Iris", date: "Mar 02", img: "https://images.unsplash.com/photo-1571875257727-256c39da42af?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "PHAs — the exfoliant for compromised skin", time: 4, tech: "Serums", auth: "Nelly", date: "Feb 25", img: "https://images.unsplash.com/photo-1512290923902-8a9f81dc236c?w=900&q=80&auto=format&fit=crop", kick: "Ingredients", pick: false },
  { t: "Can you use AHAs in the morning", time: 3, tech: "Routine", auth: "Iris", date: "Feb 20", img: "https://images.unsplash.com/photo-1598440947619-2c35fc9aa908?w=900&q=80&auto=format&fit=crop", kick: "Routine", pick: false },
  { t: "Salicylic acid with niacinamide — a good stack", time: 4, tech: "Layering", auth: "Nelly", date: "Feb 15", img: "https://images.unsplash.com/photo-1620916566398-39f1143ab7be?w=900&q=80&auto=format&fit=crop", kick: "Layering", pick: false },
  { t: "Exfoliants and SPF — what to know", time: 3, tech: "Essay", auth: "Iris", date: "Feb 10", img: "https://images.unsplash.com/photo-1556228852-80b6e5eeff06?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "AHA concentration guide — 5%, 8%, 10%, 12%", time: 5, tech: "Essay", auth: "Nelly", date: "Feb 05", img: "https://images.unsplash.com/photo-1570194065650-d99fb4bedf0a?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "Rinse-off vs leave-on exfoliants — the trade-off", time: 4, tech: "Format", auth: "Iris", date: "Jan 31", img: "https://images.unsplash.com/photo-1607006344380-b6775a0824a4?w=900&q=80&auto=format&fit=crop", kick: "Format", pick: false },
  { t: "Barrier repair after over-exfoliation", time: 5, tech: "Troubleshoot", auth: "Nelly", date: "Jan 26", img: "https://images.unsplash.com/photo-1601049541289-9b1b7bbbfe19?w=900&q=80&auto=format&fit=crop", kick: "Troubleshoot", pick: false },
  { t: "The sensitive-skin exfoliation plan", time: 5, tech: "Routine", auth: "Iris", date: "Jan 21", img: "https://images.unsplash.com/photo-1556228720-195a672e8a03?w=900&q=80&auto=format&fit=crop", kick: "Routine", pick: false },
  { t: "When to skip exfoliation entirely", time: 3, tech: "Troubleshoot", auth: "Nelly", date: "Jan 16", img: "https://images.unsplash.com/photo-1583416750470-965b2707b355?w=900&q=80&auto=format&fit=crop", kick: "Troubleshoot", pick: false },
  { t: "Salicylic acid body use — the different rules", time: 4, tech: "Essay", auth: "Iris", date: "Jan 11", img: "https://images.unsplash.com/photo-1598440947619-2c35fc9aa908?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
  { t: "Chemical exfoliants before a skin event", time: 3, tech: "Routine", auth: "Nelly", date: "Jan 06", img: "https://images.unsplash.com/photo-1512290923902-8a9f81dc236c?w=900&q=80&auto=format&fit=crop", kick: "Routine", pick: false },
  { t: "Lactic acid at higher concentrations — what changes", time: 5, tech: "Essay", auth: "Iris", date: "Jan 01", img: "https://images.unsplash.com/photo-1571875257727-256c39da42af?w=900&q=80&auto=format&fit=crop", kick: "Essay", pick: false },
];

const TECH_FILTERS = ["All", "Serums", "Layering", "Routine", "Essay", "Format", "Troubleshoot"];

// Crosslinks to 4 adjacent ingredient siblings
const TYPE_CROSSLINKS = [
  { id: "retinoids",           title: "Retinoids",          deck: "How to alternate exfoliants and retinoids.",           count: 144, href: "/en/skin/ingredients/retinoids/" },
  { id: "niacinamide",         title: "Niacinamide",         deck: "A buffer worth pairing with exfoliants.",              count: 163, href: "/en/skin/ingredients/niacinamide/" },
  { id: "ceramides",           title: "Ceramides",           deck: "Barrier repair. Essential after heavy exfoliation.",   count: 112, href: "/en/skin/ingredients/ceramides/" },
  { id: "vitamin-c",           title: "Vitamin C",           deck: "How vitamin C and AHAs interact.",                    count: 138, href: "/en/skin/ingredients/vitamin-c/" },
];

Object.assign(window, {
  OILY, TYPE_SIBLINGS, QUICK_FACTS, BEGINNER_PATH, TRENDING, FORMAT_GUIDE, HOWTOS, TECH_FILTERS, TYPE_CROSSLINKS,
});