/*
  Shenali de Fonseka — design tokens
  Two complete themes. Light is the default; dark applies when the visitor's system prefers dark
  (unless [data-theme="light"] is set) or when [data-theme="dark"] is set explicitly.
  Every colour on the site comes from these variables. See docs/BRAND.md.
*/
:root {
  /* ---- colour: light "Paper" ---- */
  --color-bg: #F5F2EC;            /* page background, warm paper */
  --color-bg-2: #ECE7DE;          /* alternate surface: footer, facts panels, image letterbox */
  --color-ink: #1B1A18;           /* primary text, logo */
  --color-ink-2: #5C5751;         /* secondary text, labels */
  --color-ink-3: #68625B;         /* captions, metadata (AA on bg and bg-2) */
  --color-line: #D9D3C8;          /* hairlines, borders */
  --color-accent: #55735F;        /* links, focus ring, small labels: sage from her rooms */
  --color-accent-strong: #3F5A48; /* link hover, buttons */
  --color-on-accent: #F5F2EC;     /* text on accent-strong */
  --color-overlay: rgba(27, 26, 24, 0.92); /* lightbox and menu backdrop */

  /* ---- type ---- */
  --font-display: "Jost", "Yaldevi", "Twentieth Century", "Futura", system-ui, sans-serif;
  --font-text: "Source Serif 4", "Noto Serif Sinhala", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;

  /* fluid type scale (min at 360px, max at 1440px) */
  --text-xs: clamp(0.72rem, 0.70rem + 0.10vw, 0.78rem);     /* labels, captions in caps */
  --text-sm: clamp(0.88rem, 0.85rem + 0.15vw, 0.95rem);     /* captions, facts */
  --text-md: clamp(1.00rem, 0.97rem + 0.20vw, 1.125rem);    /* body */
  --text-lg: clamp(1.20rem, 1.10rem + 0.45vw, 1.50rem);     /* introductions */
  --text-xl: clamp(1.50rem, 1.25rem + 1.10vw, 2.25rem);     /* section titles */
  --text-2xl: clamp(2.00rem, 1.50rem + 2.30vw, 3.50rem);    /* page titles */
  --text-3xl: clamp(2.50rem, 1.80rem + 3.60vw, 5.00rem);    /* home statement */

  --leading-tight: 1.05;
  --leading-snug: 1.2;
  --leading-text: 1.6;
  --tracking-caps: 0.14em;   /* letterspaced capitals, as in the wordmark */
  --tracking-display: -0.015em;

  --weight-display-light: 300;
  --weight-display: 400;
  --weight-display-medium: 500;
  --weight-text: 400;
  --weight-text-strong: 600;

  /* ---- spacing (8px base) ---- */
  --space-1: 0.25rem;   /* 4 */
  --space-2: 0.5rem;    /* 8 */
  --space-3: 0.75rem;   /* 12 */
  --space-4: 1rem;      /* 16 */
  --space-5: 1.5rem;    /* 24 */
  --space-6: 2rem;      /* 32 */
  --space-7: 3rem;      /* 48 */
  --space-8: 4rem;      /* 64 */
  --space-9: 6rem;      /* 96 */
  --space-10: 8rem;     /* 128 */
  --section-gap: clamp(3rem, 2rem + 5vw, 8rem);   /* between page sections */
  --gutter: clamp(1rem, 0.5rem + 2.5vw, 3rem);    /* page side margin: 16px phone, 48px desktop */
  --grid-gap: clamp(0.75rem, 0.5rem + 1.2vw, 1.5rem);

  /* ---- layout ---- */
  --content-max: 1440px;   /* canvas */
  --measure: 62ch;         /* body text line length */
  --measure-narrow: 44ch;

  /* ---- motion ---- */
  --duration-fast: 200ms;
  --duration-base: 400ms;
  --duration-slow: 700ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

  /* ---- misc ---- */
  --radius: 0;             /* the brand has no rounded corners */
  --focus-ring: 2px solid var(--color-accent);
  --focus-offset: 3px;

  color-scheme: light;
}

/* ---- dark "Ink": system preference ---- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1A1816;
    --color-bg-2: #242120;
    --color-ink: #EFEAE2;
    --color-ink-2: #B5AEA4;
    --color-ink-3: #948D84;
    --color-line: #37332F;
    --color-accent: #9DB8A8;
    --color-accent-strong: #B9CFC2;
    --color-on-accent: #1A1816;
    --color-overlay: rgba(26, 24, 22, 0.94);
    color-scheme: dark;
  }
}

/* ---- dark "Ink": explicit choice ---- */
:root[data-theme="dark"] {
  --color-bg: #1A1816;
  --color-bg-2: #242120;
  --color-ink: #EFEAE2;
  --color-ink-2: #B5AEA4;
  --color-ink-3: #948D84;
  --color-line: #37332F;
  --color-accent: #9DB8A8;
  --color-accent-strong: #B9CFC2;
  --color-on-accent: #1A1816;
  --color-overlay: rgba(26, 24, 22, 0.94);
  color-scheme: dark;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-fast: 0ms;
    --duration-base: 0ms;
    --duration-slow: 0ms;
  }
}