/* ===================================
   ポートフォリオ — 和文向け余白とコントラスト
   =================================== */
:root {
  --ink: #141816;
  --ink-muted: #4b5350;
  --paper: #f6f7f5;
  --paper-deep: #e7ebe8;
  --surface: #ffffff;
  --accent: #1f5c4a;
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --accent-hover: #154236;
  --line: rgba(20, 24, 22, 0.12);
  --radius: 12px;
  --radius-lg: 18px;
  --font-sans: "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --shadow: 0 14px 40px rgba(15, 20, 18, 0.07);
  --shadow-hover: 0 18px 48px rgba(15, 20, 18, 0.1);
  --max: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(1200px 520px at 12% -10%, var(--accent-soft), transparent 55%),
    linear-gradient(180deg, #fbfcfb 0%, var(--paper) 38%, var(--paper) 100%);
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute;
  left: -9999px;
  top: auto;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  border-radius: 4px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, #fbfcfb 86%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.06em;
}
.logo:hover {
  color: var(--accent);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav a {
  color: var(--ink-muted);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav a:hover,
.nav a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Hero */
.hero {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.25rem 1.5rem 4.75rem;
  overflow: hidden;
}

.hero__grid {
  position: absolute;
  inset: -1px;
  opacity: 0.35;
  background-image:
    linear-gradient(to right, rgba(20, 24, 22, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 24, 22, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(closest-side at 30% 20%, #000 0%, transparent 70%);
  pointer-events: none;
}

.hero__glow {
  position: absolute;
  top: -40%;
  right: -15%;
  width: min(480px, 80vw);
  height: min(480px, 80vw);
  background: radial-gradient(
    circle,
    color-mix(in srgb, var(--accent) 16%, transparent) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero__eyebrow {
  position: relative;
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero__title {
  position: relative;
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.85rem, 4.2vw, 2.55rem);
  line-height: 1.28;
  letter-spacing: 0.02em;
  max-width: 22ch;
}

.hero__lede {
  position: relative;
  margin: 0 0 2rem;
  max-width: 52ch;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.hero__lede strong {
  color: var(--accent);
  font-weight: 600;
}

.hero__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.65rem 1.35rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease,
    transform 0.12s ease;
}
.btn--primary {
  background: var(--accent);
  color: #f8faf8;
  border-color: var(--accent);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  outline: none;
}
.btn--primary:active {
  transform: translateY(1px);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: 0 0 0 1px var(--line) inset;
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  outline: none;
}

/* Sections */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
}

.section--tint {
  background: linear-gradient(180deg, var(--paper-deep) 0%, var(--paper) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  max-width: none;
  padding-left: max(1.5rem, calc(50% - 550px));
  padding-right: max(1.5rem, calc(50% - 550px));
}
.section--tint .section__head,
.section--tint .about {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}

.section__head {
  margin-bottom: 2.25rem;
}

.section__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  letter-spacing: 0.04em;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
  display: inline-block;
  min-width: min(100%, 18rem);
}

.section__sub {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
  max-width: 48ch;
}

#apps-sub {
  max-width: min(56rem, 100%);
  line-height: 1.75;
}

.site-details {
  margin-top: 1.25rem;
  max-width: min(56rem, 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  padding: 0.35rem 0.85rem;
}

.site-details__summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-muted);
  list-style: none;
}
.site-details__summary::-webkit-details-marker {
  display: none;
}
.site-details__summary::after {
  content: "＋";
  float: right;
  font-weight: 700;
  color: var(--accent);
}
.site-details[open] .site-details__summary::after {
  content: "－";
}

.site-details__body {
  padding: 0.35rem 0 0.65rem;
  color: var(--ink-muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.site-details__body p {
  margin: 0.5rem 0 0;
}

.site-details__note {
  font-size: 0.88rem;
}

.section__code {
  display: inline;
  padding: 0.1rem 0.4rem 0.15rem;
  font-size: 0.85em;
  font-family: ui-monospace, "Cascadia Code", "Consolas", monospace;
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 5%, var(--paper));
  border: 1px solid var(--line);
  border-radius: 4px;
  word-break: break-all;
}

/* App grid */
.app-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  align-content: start;
}

.app-grid__status {
  grid-column: 1 / -1;
  margin: 0;
  padding: 0.75rem 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.app-grid__empty--block {
  grid-column: 1 / -1;
}

.app-grid__empty-text {
  margin: 0;
  max-width: 42em;
  color: var(--ink-muted);
  font-size: 0.98rem;
  line-height: 1.75;
}

.app-grid__code {
  display: inline;
  padding: 0.1rem 0.35rem;
  font-size: 0.9em;
  font-family: ui-monospace, "Cascadia Code", "Consolas", monospace;
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 5%, var(--paper));
  border: 1px solid var(--line);
  border-radius: 4px;
  word-break: break-all;
}

.app-grid__empty-link {
  color: var(--accent);
  text-underline-offset: 2px;
  font-weight: 600;
}
.app-grid__empty-link:hover,
.app-grid__empty-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.app-card {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1.5rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.app-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  transform: translateY(-2px);
}

.app-card__icon {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.app-card__name {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.app-card__desc {
  margin: 0 0 1.25rem;
  flex: 1;
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.app-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
  text-decoration: none;
  width: fit-content;
  min-height: 44px;
  margin-top: auto;
}
.app-card__link:hover,
.app-card__link:focus-visible {
  text-decoration: underline;
  outline: none;
}
.app-card__link:focus-visible {
  box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--accent);
  border-radius: 4px;
}

.app-card__arrow {
  font-size: 0.9em;
  line-height: 1;
}

/* About */
.about__text p {
  margin: 0 0 1rem;
  color: var(--ink-muted);
  max-width: 60ch;
}
.about__text p:last-child {
  margin-bottom: 0;
}

.about__tags {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.about__tags li {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* Connect */
.connect-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.9rem;
}

.connect-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-height: 88px;
  padding: 1.1rem 1.2rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(20, 18, 15, 0.04);
  transition: border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}
.connect-card:hover,
.connect-card:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow);
  outline: none;
}

.connect-card__label {
  font-weight: 600;
  font-size: 1rem;
}
.connect-card__hint {
  font-size: 0.85rem;
  color: var(--ink-muted);
}
.connect-card:hover .connect-card__hint,
.connect-card:focus-visible .connect-card__hint {
  color: var(--ink-muted);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, #fbfcfb 92%, transparent);
}

.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.25rem 1.5rem 2.75rem;
  text-align: center;
}

.site-footer__line {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
}

.site-footer__sep {
  margin: 0 0.35rem;
  opacity: 0.55;
}

.site-footer__tag {
  font-weight: 600;
  color: var(--ink);
}

.site-footer__legal {
  margin: 0.65rem 0 0;
  font-size: 0.78rem;
  color: color-mix(in srgb, var(--ink-muted) 85%, var(--ink));
}

/* Small screens: nav */
@media (max-width: 520px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero {
    padding-top: 3rem;
  }
}