/* SOLVLET — brand site
   Typography-led, restrained. One accent colour, wide whitespace, no imagery. */

:root {
  --paper:      #faf9f6;
  --paper-alt:  #f3f1eb;
  --ink:        #191813;
  --ink-muted:  #6e6a61;
  --rule:       #e2ded4;
  --accent:     #2e6b57;
  --accent-ink: #245544;

  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic Medium", "Yu Gothic", Meiryo, Arial, sans-serif;

  --measure: 34rem;      /* comfortable reading width for body copy */
  --frame:   58rem;      /* outer content frame */
  --gutter:  clamp(1.5rem, 6vw, 5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #14140f;
    --paper-alt:  #1c1c16;
    --ink:        #eeebe3;
    --ink-muted:  #9c978b;
    --rule:       #2e2d26;
    --accent:     #8cc4ac;
    --accent-ink: #a8d5c1;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  z-index: 10;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
}

a {
  color: var(--accent-ink);
  text-decoration: none;
  text-underline-offset: 0.24em;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

p { margin: 0 0 1.35em; }
p:last-child { margin-bottom: 0; }

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

.wrap {
  width: 100%;
  max-width: var(--frame);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section {
  padding-block: clamp(3.5rem, 9vw, 6.5rem);
  border-top: 1px solid var(--rule);
}

.section__label {
  margin: 0 0 1.75rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.prose {
  max-width: var(--measure);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.075rem);
  color: var(--ink);
}
.prose--muted { color: var(--ink-muted); }

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(5rem, 16vw, 11rem) clamp(4rem, 11vw, 8rem);
}

.wordmark {
  margin: 0;
  font-size: clamp(2.4rem, 1.1rem + 6.4vw, 5.25rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.14em;
  /* optical trim: tracking adds space after the final letter */
  margin-right: -0.14em;
  color: var(--ink);
}

.hero__tagline {
  margin: clamp(1.75rem, 5vw, 2.75rem) 0 0;
  max-width: 24ch;
  font-size: clamp(1.2rem, 0.98rem + 1.05vw, 1.85rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.hero__sub {
  margin: 1.1rem 0 0;
  max-width: var(--measure);
  font-size: clamp(0.95rem, 0.92rem + 0.15vw, 1.02rem);
  color: var(--ink-muted);
}

.hero__rule {
  width: 3.5rem;
  height: 2px;
  margin: clamp(2.25rem, 5vw, 3rem) 0 0;   /* reset UA auto side-margins */
  background: var(--accent);
  border: 0;
}

/* ---------- App list ---------- */

.apps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: 1.25rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: clamp(1.5rem, 4vw, 2rem);
  background: var(--paper-alt);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.card__name {
  margin: 0;
  font-size: clamp(1.15rem, 1.05rem + 0.4vw, 1.4rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.card__byline {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}

.card__desc {
  margin: 0.35rem 0 0.6rem;
  font-size: 0.97rem;
  color: var(--ink-muted);
}

.card__link {
  align-self: flex-start;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  word-break: break-word;
}
.card__link::after {
  content: " \2192";
  white-space: nowrap;
}

.apps__note {
  max-width: var(--measure);
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

/* ---------- Contact ---------- */

.contact__mail {
  display: inline-block;
  margin: 0 0 1rem;
  font-size: clamp(1.15rem, 0.98rem + 0.8vw, 1.6rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  word-break: break-word;
}

/* ---------- Footer ---------- */

.footer {
  padding-block: clamp(2.5rem, 6vw, 3.5rem);
  border-top: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.footer__copy {
  margin: 0;
  letter-spacing: 0.04em;
}

.lang {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  margin: 0;
  letter-spacing: 0.04em;
}
.lang__sep { color: var(--rule); }
.lang [aria-current="true"] {
  color: var(--ink);
  font-weight: 600;
}

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