/* =====================================================
   yasuda-dev.com — style.css
   Editorial Minimalism. No frameworks. No build step.
   ===================================================== */

/* ----- Design tokens ----- */
:root {
  /* Color */
  --bg:        #FAFAF7;
  --fg:        #1A1A1A;
  --muted:     #767472;
  --border:    #E8E6E1;
  --accent:    #FF5A1F;

  /* Type */
  --font-display: "Fraunces", "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --font-body:    "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  --font-mono:    "JetBrains Mono", "Cascadia Code", ui-monospace, monospace;

  /* Type scale */
  --t-display: clamp(48px, 8vw, 96px);
  --t-h1:      clamp(36px, 5vw, 64px);
  --t-h2:      clamp(28px, 3.5vw, 40px);
  --t-h3:      1.75rem;
  --t-body:    1.125rem;
  --t-small:   0.875rem;

  /* Spacing */
  --section-gap: clamp(80px, 10vw, 140px);
  --container:   1280px;
  --gutter:      clamp(20px, 4vw, 40px);

  /* Motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ----- Reset (minimal) ----- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 180ms var(--ease), text-decoration-color 180ms var(--ease);
}

ul { list-style: none; padding: 0; margin: 0; }

/* Focus */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--fg);
  color: var(--bg);
  padding: 12px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
}

/* ============== Layout containers ============== */
.hero__inner,
.selected__inner,
.about__inner,
.contact__inner,
.site-header__inner,
.site-footer__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ============== Header ============== */
.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.72);
  backdrop-filter: saturate(120%) blur(10px);
  -webkit-backdrop-filter: saturate(120%) blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 18px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--fg);
}
.logo:hover { color: var(--accent); }

.nav {
  display: flex;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
}
.nav a {
  color: var(--muted);
  text-decoration-color: transparent;
}
.nav a:hover {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: currentColor;
}

@media (max-width: 540px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-block: 14px;
  }
  .nav { gap: 18px; }
}

/* ============== Hero ============== */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  padding-bottom: var(--section-gap);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--t-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(40px, 6vw, 72px);
  font-variation-settings: "opsz" 144;
}

/* CTA */
.cta {
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.cta:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.cta__arrow {
  display: inline-block;
  transition: transform 220ms var(--ease);
}
.cta:hover .cta__arrow { transform: translateX(4px); }

/* ============== Section heads ============== */
.section-head {
  margin-bottom: clamp(48px, 6vw, 88px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--t-h2);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0;
  font-variation-settings: "opsz" 72;
}

/* ============== Selected ============== */
.selected {
  padding-block: var(--section-gap);
}

.work {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
  margin-bottom: clamp(80px, 12vw, 160px);
}
.work:last-child { margin-bottom: 0; }

@media (min-width: 900px) {
  .work {
    grid-template-columns: 1.1fr 1fr;
    align-items: start;
  }
}

.work__media {
  position: relative;
}

.work__placeholder {
  aspect-ratio: 16 / 10;
  background: #EFEDE6;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  color: var(--muted);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.work__placeholder--alt {
  background: #F2EFE7;
}

.work__meta {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.work__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin: 0;
  letter-spacing: 0.04em;
}

.work__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0;
  font-variation-settings: "opsz" 72;
}

.work__lead {
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 0;
  color: var(--fg);
}

.work__note {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0;
}

.work__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}
.work__tech li {
  position: relative;
  padding-right: 14px;
}
.work__tech li:not(:last-child)::after {
  content: "·";
  position: absolute;
  right: 0;
  color: var(--border);
}

.work__story {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--fg);
  margin: 8px 0 0;
  max-width: 56ch;
}

.work__cta {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg);
  margin-top: 12px;
  align-self: flex-start;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}
.work__cta:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.work__cta--soon {
  color: var(--muted);
  pointer-events: none;
}

/* ============== About ============== */
.about {
  padding-block: var(--section-gap);
}

.about__body {
  max-width: 60ch;
}

.about__body p {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.5;
  letter-spacing: -0.005em;
  margin: 0 0 24px;
  font-variation-settings: "opsz" 36;
}

.about__ja {
  font-family: var(--font-body) !important;
  font-size: 0.95rem !important;
  color: var(--muted);
  line-height: 1.7 !important;
}

/* ============== Contact ============== */
.contact {
  padding-block: var(--section-gap);
}

.contact__list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 15px;
  margin: 0;
}
.contact__list > div {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  align-items: baseline;
}
.contact__list dt {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.contact__list dd {
  margin: 0;
  color: var(--fg);
}
.contact__list a {
  text-decoration-color: var(--border);
}
.contact__list a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ============== Footer ============== */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: var(--section-gap);
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

/* ============== Reveal animation ============== */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============== 404 page ============== */
.error-page {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 120px;
}
.error-page__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.error-page__code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin: 0 0 16px;
}
.error-page__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--t-h1);
  line-height: 1.1;
  margin: 0 0 clamp(32px, 4vw, 56px);
}

/* ============== Apps page ============== */
.apps-hero {
  padding-top: 160px;
  padding-bottom: var(--section-gap);
}
.apps-hero__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.apps-hero__intro {
  max-width: 48ch;
  color: var(--muted);
  margin: 0;
}

.apps-list {
  padding-bottom: var(--section-gap);
}
.apps-list__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-card {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 180ms var(--ease);
}
.app-card:hover { border-color: var(--muted); }

.app-card__icon {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: #EFEDE6;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--muted);
}
.app-card__icon--alt { background: #F2EFE7; }

.app-card__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.app-card__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0;
}

.app-card__desc {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

.app-card__links {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  margin-top: 4px;
}
.app-card__links a {
  color: var(--fg);
  text-decoration-color: var(--border);
}
.app-card__links a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
.app-card__soon {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
}

@media (max-width: 540px) {
  .app-card { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}