/* ============================================================
   UTILITIES.CSS — reset, layout-apuluokat, painikkeet
   Vain layout, spacing ja apuluokat — ei komponenttikohtaisia tyylejä.
   ============================================================ */

/* ---- Reset ---- */

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img    { max-width: 100%; display: block; }
a      { color: inherit; text-decoration: none; }
ul     { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, p { margin: 0; }
address { font-style: normal; }

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

.section { padding: var(--space-2xl) 0; }

.section--light { background-color: var(--color-bg-light); }
.section--off   { background-color: var(--color-bg-off); }
.section--dark  { background-color: var(--color-dark); }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

@media (max-width: 900px) {
  .container { padding: 0 var(--space-lg); }
}

@media (max-width: 680px) {
  .section    { padding: var(--space-xl) 0; }
  .container  { padding: 0 var(--space-md); }
}

/* ---- Stackit ---- */

.l-stack         { display: flex; flex-direction: column; gap: var(--space-md); }
.l-stack--sm     { display: flex; flex-direction: column; gap: var(--space-sm); }
.l-stack--lg     { display: flex; flex-direction: column; gap: var(--space-lg); }
.l-stack--xl     { display: flex; flex-direction: column; gap: var(--space-xl); }
.l-stack--text   { display: flex; flex-direction: column; gap: var(--space-lg); }
.l-stack--center { display: flex; flex-direction: column; align-items: center; }

/* ---- Gridit ---- */

.l-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.l-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--grid-gap);
}

@media (max-width: 1000px) {
  .l-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .l-grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 650px) {
  .l-grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 420px) {
  .l-grid-4 { grid-template-columns: 1fr; }
}

/* ---- Korttiruudukot ---- */

.l-cards-3 {
  display: flex;
  flex-wrap: wrap;
  gap: var(--grid-gap);
}

.l-cards-3 > * {
  width: calc(4 * var(--grid-col-width) + 3 * var(--grid-gap));
  flex-grow: 0;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .l-cards-3 > * { width: calc(50% - var(--grid-gap) / 2); }
}

@media (max-width: 600px) {
  .l-cards-3 > * { width: 100%; }
}

/* ---- Utility ---- */

.u-center {
  align-items: center;
  text-align: center;
}

.u-center-y {
  display: flex;
  align-items: center;
}

.u-inset {
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
}

@media (max-width: 650px)  { .u-hide-mobile  { display: none; } }
@media (min-width: 1000px) { .u-hide-desktop { display: none; } }

/* ---- Painikkeet ---- */

.btn-primary {
  display: inline-block;
  padding: 0.9rem 2rem;
  background-color: var(--color-accent);
  color: var(--color-dark);
  border: 2px solid var(--color-accent);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--tr-fast), color var(--tr-fast), border-color var(--tr-fast);
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--color-border-strong);
  padding-bottom: 2px;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  cursor: pointer;
  transition: color var(--tr-fast), border-color var(--tr-fast);
}

.btn-secondary::after {
  content: '→';
  font-size: 0.9em;
}

.btn-secondary:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

/* Nappi-variantit tummalla / kuvan päällä */

.on-image .btn-primary,
.section--dark .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-dark);
  border-color: var(--color-accent);
}

.on-image .btn-primary:hover,
.section--dark .btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

.on-image .btn-secondary,
.section--dark .btn-secondary {
  color: var(--color-text-on-dark);
  border-color: rgba(244, 248, 250, 0.4);
}

.on-image .btn-secondary:hover,
.section--dark .btn-secondary:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* font__ui napissa — kontekstiväri ei ylikirjoita tumman napin tekstiväriä */
.font__ui.btn-primary { color: var(--color-dark); }