/* ==========================================================================
   IOTA Base — reset + shared primitives for the brand shell
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  /* Korean: break lines between words, never inside them */
  word-break: keep-all;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

button {
  font: inherit;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

/* ---- Layout primitives ---- */

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-7);
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.75em 1.5em;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  border-color: var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink);
}

.btn--ghost:hover {
  border-color: var(--color-ink-faint);
}

/* ---- Misc ---- */

.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.tag {
  display: inline-block;
  padding: 0.25em 0.9em;
  border-radius: var(--radius-full);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 600;
}

/* Scroll-reveal: elements with [data-reveal] fade in via main.js.
   Hidden state only applies when JS has run (html.js set inline in <head>),
   so content stays visible without JS — for crawlers and static captures. */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}