/* ==========================================================================
   KRAFTIMA — Design System / Base
   Warm-ink editorial identity. Tokens, reset, typography, primitives.
   ========================================================================== */

/* ---- Fonts (self-hostable later; using variable Google fonts for build) --- */
/* Display: Space Grotesk (tight modern grotesque)
   Serif:   Fraunces (humanist editorial serif, optical sizing)
   Mono/UI: monospace stack for indices & labels                              */

:root {
  /* --- Palette -------------------------------------------------------- */
  --ink:        #141210;   /* near-black warm ink — primary text/bg     */
  --ink-2:      #1d1a16;   /* raised ink surface                        */
  --paper:      #f5f1e9;   /* warm paper — primary light bg             */
  --paper-2:    #ece6da;   /* paper shade                               */
  --amber:      #e4562a;   /* saffron-amber — the single accent         */
  --amber-2:    #f2a63b;   /* marigold highlight (gradient partner)     */
  --muted:      #8a8378;   /* muted warm grey for meta text             */
  --line:       rgba(20,18,16,.14);      /* hairline on paper           */
  --line-inv:   rgba(245,241,233,.16);   /* hairline on ink             */

  /* Semantic (light context = default) */
  --bg:         var(--paper);
  --bg-2:       var(--paper-2);
  --fg:         var(--ink);
  --fg-muted:   var(--muted);
  --hairline:   var(--line);
  --accent:     var(--amber);

  /* --- Type scale (fluid, clamp-based) ------------------------------- */
  --step--1: clamp(0.78rem, 0.75rem + 0.15vw, 0.86rem);
  --step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.13rem);
  --step-1:  clamp(1.33rem, 1.2rem + 0.6vw, 1.75rem);
  --step-2:  clamp(1.8rem, 1.55rem + 1.2vw, 2.75rem);
  --step-3:  clamp(2.4rem, 1.9rem + 2.5vw, 4.25rem);
  --step-4:  clamp(2.6rem, 1.8rem + 4vw, 6.5rem);
  --step-5:  clamp(3rem, 1.9rem + 6.2vw, 9.5rem);

  /* --- Fonts ---------------------------------------------------------- */
  --font-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-serif:   "Fraunces", Georgia, "Times New Roman", serif;
  --font-mono:    ui-monospace, "SF Mono", "Roboto Mono", Menlo, monospace;

  /* --- Spacing scale -------------------------------------------------- */
  --sp-1: 0.5rem;  --sp-2: 1rem;    --sp-3: 1.5rem;  --sp-4: 2.5rem;
  --sp-5: 4rem;    --sp-6: 6rem;    --sp-7: 9rem;    --sp-8: 13rem;

  /* --- Layout --------------------------------------------------------- */
  --wrap: 1600px;         /* full editorial max width                    */
  --measure: 62ch;        /* prose measure                               */
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --radius: 0px;          /* editorial: no rounding by default           */

  /* --- Motion system (ONE coherent language) ------------------------- */
  /* Easing */
  --ease: cubic-bezier(0.6, 0.05, 0.05, 0.98);   /* structural moves      */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);     /* entrances (decelerate)*/
  --ease-io: cubic-bezier(0.65, 0, 0.35, 1);     /* symmetric in/out      */
  /* Durations — a small fixed set, used everywhere */
  --t-micro: 0.2s;    /* taps, tiny state changes      */
  --t-fast:  0.32s;   /* hovers, buttons, links        */
  --t-base:  0.6s;    /* section transitions           */
  --t-slow:  0.9s;    /* entrance reveals              */
  --t-hero:  1s;      /* hero clip / masked reveals    */
  /* Stagger step for grouped entrances */
  --stagger: 0.07s;
  /* Legacy aliases (kept so existing rules resolve) */
  --dur: var(--t-base);
  --dur-fast: var(--t-fast);

  --header-h: 84px;
}

/* Dark (ink) context — apply .on-ink to any section */
.on-ink {
  --bg: var(--ink);
  --bg-2: var(--ink-2);
  --fg: var(--paper);
  --fg-muted: #a49c8e;
  --hairline: var(--line-inv);
  background: var(--bg);
  color: var(--fg);
}

/* ---- Reset --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  font-size: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}
body {
  font-family: var(--font-display);
  font-size: var(--step-0);
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul, ol { list-style: none; }
::selection { background: var(--amber); color: var(--paper); }

/* ---- Typographic primitives --------------------------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.03em;
}
.serif { font-family: var(--font-serif); font-optical-sizing: auto; }
.italic { font-style: italic; }

h1, .h1 { font-family: var(--font-display); font-weight: 500; font-size: var(--step-4); line-height: 0.95; letter-spacing: -0.035em; text-wrap: balance; }
h2, .h2 { font-family: var(--font-display); font-weight: 500; font-size: var(--step-3); line-height: 1.0;  letter-spacing: -0.03em; text-wrap: balance; }
h3, .h3 { font-family: var(--font-display); font-weight: 500; font-size: var(--step-2); line-height: 1.05; letter-spacing: -0.02em; text-wrap: balance; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.index {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}
.lead {
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.4;
  font-weight: 380;
  text-wrap: pretty;
}
.prose { max-width: var(--measure); text-wrap: pretty; }
.prose p + p { margin-top: 1.1em; }

/* ---- Layout helpers ------------------------------------------------------ */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(4rem, 10vw, var(--sp-7)); position: relative; }
.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gutter); }
.stack > * + * { margin-top: var(--sp-3); }

/* Accent underline / marker */
.accent { color: var(--accent); }
.amber-rule { height: 2px; width: 3.5rem; background: var(--accent); border: 0; }

/* ---- Buttons / links ----------------------------------------------------- */
.btn {
  --btn-fg: var(--paper);
  --btn-bg: var(--ink);
  display: inline-flex; align-items: center; gap: 0.7em;
  padding: 1.05em 1.6em;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--step-0);
  letter-spacing: -0.01em;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border-radius: 999px;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn > span { position: relative; z-index: 1; }
.btn .btn-arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn::after {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: var(--accent);
  transform: translateY(101%);
  transition: transform var(--dur-fast) var(--ease);
}
.btn:hover::after, .btn:focus-visible::after { transform: translateY(0); }
.btn:hover .btn-arrow, .btn:focus-visible .btn-arrow { transform: translate(4px, -4px); }
.btn:hover { color: var(--paper); }
.on-ink .btn { --btn-bg: var(--paper); --btn-fg: var(--ink); }
.on-ink .btn:hover { color: var(--paper); }

.btn-ghost {
  --btn-bg: transparent; --btn-fg: var(--fg);
  border: 1px solid var(--hairline);
}
.btn-ghost:hover { color: var(--paper); }

/* Text link with animated rule */
.link {
  position: relative;
  display: inline-flex; align-items: center; gap: 0.5em;
  font-weight: 500;
  padding-bottom: 2px;
}
.link::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: currentColor; transform: scaleX(0); transform-origin: right;
  transition: transform var(--dur-fast) var(--ease);
}
.link:hover::after, .link:focus-visible::after { transform: scaleX(1); transform-origin: left; }
.link .link-arrow { transition: transform var(--dur-fast) var(--ease-out); color: var(--accent); }
.link:hover .link-arrow { transform: translateX(4px); }

/* ---- Focus (accessibility) ---------------------------------------------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 1000;
  background: var(--ink); color: var(--paper); padding: 1em 1.4em;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* ---- Reveal-on-scroll utility ------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* Auto-stagger: children of [data-stagger] reveal in sequence */
[data-stagger] > * { transition-delay: calc(var(--child-i, 0) * var(--stagger)); }

/* ---- Page transition overlay -------------------------------------------- */
.pt-overlay {
  position: fixed; inset: 0; z-index: 950; pointer-events: none;
  background: var(--ink);
  transform: scaleY(0); transform-origin: bottom;
  transition: transform 0.5s var(--ease);
}
.pt-overlay.is-covering { transform: scaleY(1); transform-origin: bottom; pointer-events: all; }
.pt-overlay.is-revealing { transform: scaleY(0); transform-origin: top; }
/* Content fades in on load */
body { opacity: 1; }
body.pt-enter { opacity: 0; }
body.pt-ready { opacity: 1; transition: opacity 0.4s var(--ease-out); }
@media (prefers-reduced-motion: reduce) {
  .pt-overlay { display: none; }
  body.pt-enter { opacity: 1; }
}

/* Line-mask reveal for headings */
.reveal-line { overflow: hidden; display: block; }
.reveal-line > span {
  display: block;
  transform: translateY(105%);
  transition: transform 0.9s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
.is-in .reveal-line > span, .reveal-line.is-in > span { transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal-line > span { transform: none; }
}

/* ---- Custom cursor (desktop pointer only) ------------------------------- */
.cursor {
  position: fixed; top: 0; left: 0; z-index: 900;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--amber);
  pointer-events: none;
  transform: translate(-50%, -50%);
  transition: width .3s var(--ease-out), height .3s var(--ease-out), background .3s;
  mix-blend-mode: normal;
}
.cursor.is-label {
  width: 84px; height: 84px;
  background: var(--amber);
}
.cursor__text {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--paper);
  opacity: 0; transition: opacity .3s;
}
.cursor.is-label .cursor__text { opacity: 1; }
@media (hover: none), (pointer: coarse) { .cursor { display: none; } }

/* ---- Brand logo (swap-ready) -------------------------------------------
   Uses real PNG at assets/images/kraftima-logo.png when present; falls back
   to the typographic wordmark. .brand--img shows only when the <img> loads. */
.brand__img {
  height: 30px; width: auto; display: none;
}
.brand__img.is-loaded { display: block; }
.brand__img.is-loaded ~ .brand__word { display: none; }
/* On ink/dark contexts, allow a light logo variant via filter if only a dark
   PNG is supplied. The header inverts the logo when showing light text
   (transparent over a dark hero, or solid over an ink section). */
.on-ink .brand__img[data-auto-invert],
.header:not(.header--light) .brand__img[data-auto-invert],
.header--on-ink .brand__img[data-auto-invert] { filter: invert(1) brightness(1.7); }
.brand__word { display: inline-flex; align-items: center; gap: .5rem; }

/* Utility visibility */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.desk-only { }
.mob-only { display: none; }
@media (max-width: 820px) {
  .desk-only { display: none !important; }
  .mob-only { display: revert; }
}