/* =========================================================
   Kniraven Standard CSS
   File: /public/assets/css/kn/kn-standard.css

   Purpose:
   This file defines Kniraven's standard behavior for plain HTML
   elements and shared structural tokens.

   Use this file for site-wide element decisions like:
   - Standard section rhythm
   - Standard heading and paragraph spacing
   - Standard form element sizing
   - Standard table behavior
   - Standard cursor behavior
   - Shared structural tokens

   Do not put reusable layout classes here.
   Those belong in kn-structure.css.

   Do not put browser normalization here.
   Browser normalization belongs in kn-normalize.css.

   Do not put visual theme styling here.
   Colors, fonts, shadows, border colors, border styles,
   border radius, hover colors, and visual personality belong
   in a kn-theme-*.css file.

   Public/reusable convention:
   - File name uses the kn- prefix.
   - CSS custom properties use the --kn- prefix.
   - This file uses a cascade layer.
   - This file intentionally affects plain HTML elements.
   - Element selectors use low specificity where practical so
     project CSS and third-party CSS can override them easily.
   ========================================================= */

@layer kn.normalize, kn.standard, kn.structure, kn.theme;

@layer kn.standard {
  /* =========================================================
     1. STRUCTURE TOKENS
     ========================================================= */

  :root {
    /* ---------------------------------------------------------
       Breakpoints
       --------------------------------------------------------- */

    --kn-screen-sm: 576px;
    --kn-screen-md: 768px;
    --kn-screen-lg: 1024px;
    --kn-screen-xl: 1280px;
    --kn-screen-xxl: 1536px;

    /* ---------------------------------------------------------
       Container
       --------------------------------------------------------- */

    --kn-container-size: 100%;
    --kn-container-padding-inline: 1rem;

    /* ---------------------------------------------------------
       Text measure
       --------------------------------------------------------- */

    --kn-measure-narrow: 50ch;
    --kn-measure-standard: 64ch;
    --kn-measure-wide: 76ch;

    /* ---------------------------------------------------------
       Spacing scale
       --------------------------------------------------------- */

    --kn-space-2xs: 0.25rem;
    --kn-space-xs: 0.5rem;
    --kn-space-sm: 0.75rem;
    --kn-space-md: 1rem;
    --kn-space-lg: 1.5rem;
    --kn-space-xl: 2rem;
    --kn-space-2xl: 3rem;
    --kn-space-3xl: 4rem;
    --kn-space-4xl: 6rem;

    /* ---------------------------------------------------------
       Section rhythm
       --------------------------------------------------------- */

    --kn-section-padding-tight: 1rem;
    --kn-section-padding-block: 1.5rem;
    --kn-section-padding-roomy: 2.5rem;

    /* ---------------------------------------------------------
       Document/article rhythm
       --------------------------------------------------------- */

    --kn-article-header-gap: var(--kn-space-lg);
    --kn-article-section-gap: var(--kn-space-xl);
    --kn-article-entry-gap: var(--kn-space-lg);
    --kn-article-header-row-gap: var(--kn-space-xs);
    --kn-article-header-column-gap: var(--kn-space-lg);

    /* ---------------------------------------------------------
       Layout rhythm
       --------------------------------------------------------- */

    --kn-content-gap: var(--kn-space-lg);
    --kn-grid-gap: 1.25rem;
    --kn-stack-gap: var(--kn-space-md);
    --kn-inline-gap: var(--kn-space-sm);

    /* ---------------------------------------------------------
       Typography sizing
       --------------------------------------------------------- */

    --kn-font-size-sm: 0.875rem;
    --kn-font-size-base: 1rem;
    --kn-font-size-md: 1.0625rem;
    --kn-font-size-lg: clamp(1.15rem, 1.5vw, 1.375rem);
    --kn-font-size-xl: clamp(1.55rem, 2.5vw, 2rem);
    --kn-font-size-2xl: clamp(2rem, 4vw, 3.4rem);

    --kn-line-height-tight: 1.08;
    --kn-line-height-heading: 1.15;
    --kn-line-height-body: 1.6;

    /* ---------------------------------------------------------
       Component sizing
       --------------------------------------------------------- */

    --kn-border-width: 1px;

    --kn-button-min-block-size: 2.5rem;
    --kn-button-padding-block: 0.625rem;
    --kn-button-padding-inline: 0.875rem;

    --kn-button-small-min-block-size: 2.125rem;
    --kn-button-small-padding-block: 0.45rem;
    --kn-button-small-padding-inline: 0.7rem;

    --kn-card-padding: var(--kn-space-md);

    --kn-form-field-padding-block: 0.75rem;
    --kn-form-field-padding-inline: 0.875rem;

    --kn-site-header-min-height: 4.25rem;
  }

  @media (min-width: 576px) {
    :root {
      --kn-container-size: 540px;
    }
  }

  @media (min-width: 768px) {
    :root {
      --kn-container-size: 720px;
      --kn-container-padding-inline: 1.5rem;

      --kn-section-padding-tight: 1.25rem;
      --kn-section-padding-block: 1.75rem;
      --kn-section-padding-roomy: 2.75rem;

      --kn-article-header-gap: var(--kn-space-xl);
      --kn-article-section-gap: var(--kn-space-xl);
      --kn-article-entry-gap: var(--kn-space-lg);

      --kn-card-padding: 1rem;
    }
  }

  @media (min-width: 1024px) {
    :root {
      --kn-container-size: 960px;
    }
  }

  @media (min-width: 1280px) {
    :root {
      --kn-container-size: 1140px;

      --kn-section-padding-tight: 1.25rem;
      --kn-section-padding-block: 2rem;
      --kn-section-padding-roomy: 3.25rem;
    }
  }

  @media (min-width: 1536px) {
    :root {
      --kn-container-size: 1200px;
    }
  }


  /* =========================================================
     2. BASE PAGE ELEMENTS
     ========================================================= */

  :where(body) {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100svh;
    font-size: var(--kn-font-size-base);
    line-height: var(--kn-line-height-body);
  }

  :where(main) {
    flex: 1;
  }

  :where(main > section) {
    padding-block: var(--kn-section-padding-block);
  }


  /* =========================================================
     3. DOCUMENT / ARTICLE ELEMENT RHYTHM
     ========================================================= */

  :where(article > header) {
    margin-block-end: var(--kn-article-header-gap);
  }

  :where(article > section + section) {
    margin-block-start: var(--kn-article-section-gap);
  }

  :where(article > section > section + section) {
    margin-block-start: var(--kn-article-entry-gap);
  }

  :where(article > section > section > header) {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--kn-article-header-row-gap) var(--kn-article-header-column-gap);
    margin-block-end: var(--kn-space-sm);
  }

  :where(article > section > section > header > *) {
    margin-block-end: 0;
  }

  @media (min-width: 768px) {
    :where(article > section > section > header) {
      grid-template-columns: minmax(0, 1fr) auto;
      align-items: start;
    }

    :where(article > section > section > header > :last-child) {
      justify-self: end;
      text-align: right;
      white-space: nowrap;
    }
  }


  /* =========================================================
     4. TYPOGRAPHY ELEMENT DEFAULTS
     ========================================================= */

  :where(h1, h2, h3, h4) {
    line-height: var(--kn-line-height-heading);
    margin-block-end: var(--kn-space-sm);
  }

  :where(h1) {
    font-size: var(--kn-font-size-2xl);
    line-height: var(--kn-line-height-tight);
  }

  :where(h2) {
    font-size: var(--kn-font-size-xl);
  }

  :where(h3) {
    font-size: var(--kn-font-size-lg);
  }

  :where(h4) {
    font-size: var(--kn-font-size-md);
  }

  :where(p, ul, ol, dl, blockquote) {
    margin-block-end: var(--kn-space-md);
  }

  :where(dt) {
    margin-block-start: var(--kn-space-xs);
  }

  :where(dt:first-child) {
    margin-block-start: 0;
  }

  :where(dd) {
    margin-inline-start: var(--kn-space-lg);
    margin-block-end: var(--kn-space-xs);
  }

  :where(li) {
    margin-block-end: var(--kn-space-2xs);
  }

  :where(li:last-child) {
    margin-block-end: 0;
  }

  :where(a) {
    overflow-wrap: break-word;
  }

  :where(blockquote) {
    margin-inline-start: 0;
  }

  :where(pre) {
    overflow-x: auto;
  }


  /* =========================================================
     5. TABLE ELEMENT DEFAULTS
     ========================================================= */

  :where(table) {
    width: 100%;
    border-collapse: collapse;
  }


  /* =========================================================
     6. FORM ELEMENT DEFAULTS
     ========================================================= */

  :where(label) {
    display: inline-block;
  }

  :where(input, textarea, select) {
    width: 100%;
    padding: var(--kn-form-field-padding-block) var(--kn-form-field-padding-inline);
    border-width: var(--kn-border-width);
  }

  :where(textarea) {
    min-height: 10rem;
    resize: vertical;
  }

  :where(button, input[type="submit"], input[type="button"]) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--kn-space-xs);
    min-height: var(--kn-button-min-block-size);
    padding: var(--kn-button-padding-block) var(--kn-button-padding-inline);
    border-width: var(--kn-border-width);
    line-height: 1;
    cursor: pointer;
  }

  :where(button, input, textarea, select):disabled {
    cursor: not-allowed;
  }


  /* =========================================================
     7. USABILITY ELEMENT DEFAULTS
     ========================================================= */

  :where(:target) {
    scroll-margin-block: 2rem;
  }

  :where(:focus-visible) {
    outline-offset: 0.25rem;
  }

  :where(summary, select, label[for], input[type="checkbox"], input[type="radio"]) {
    cursor: pointer;
  }

  :where(input, textarea, [contenteditable="true"]) {
    cursor: text;
  }

  :where(details > summary) {
    user-select: none;
  }
}