/* =========================================
   Design tokens
   ========================================= */
:root {
  --bg: #f4f7f8;
  --surface: #ffffff;
  --surface-elev: rgba(255, 255, 255, 0.86);
  --surface-strong: #f9fbfc;
  --text: #111827;
  --text-soft: #344054;
  --text-muted: #667085;
  --border: #d7dee6;
  --border-soft: #e7edf2;

  --brand: #0f766e;
  --brand-2: #2563eb;
  --accent: #f97316;
  --accent-2: #c026d3;

  --grad-brand: linear-gradient(135deg, #0f766e 0%, #2563eb 58%, #f97316 100%);
  --grad-soft: linear-gradient(135deg, rgba(15, 118, 110, 0.11), rgba(37, 99, 235, 0.09), rgba(249, 115, 22, 0.08));
  --grad-text: linear-gradient(135deg, #0f766e 0%, #1d4ed8 56%, #f97316 100%);

  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06), 0 1px 1px rgba(17, 24, 39, 0.04);
  --shadow-md: 0 12px 28px rgba(17, 24, 39, 0.10);
  --shadow-lg: 0 22px 55px rgba(17, 24, 39, 0.14);
  --shadow-brand: 0 18px 38px rgba(37, 99, 235, 0.22);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --radius-xl: 8px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.18s var(--ease);
  --t-med: 0.32s var(--ease);
  --t-slow: 0.72s var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1118;
    --surface: #111923;
    --surface-elev: rgba(17, 25, 35, 0.86);
    --surface-strong: #162231;
    --text: #eef4f8;
    --text-soft: #c7d4df;
    --text-muted: #91a1af;
    --border: #263545;
    --border-soft: #1e2b38;
    --grad-soft: linear-gradient(135deg, rgba(20, 184, 166, 0.12), rgba(96, 165, 250, 0.10), rgba(251, 146, 60, 0.08));
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.38);
    --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.34);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.42);
  }
}

/* =========================================
   Reset & Base
   ========================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Helvetica Neue", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  font-feature-settings: "palt";
  line-height: 1.75;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(244, 247, 248, 0.96), rgba(244, 247, 248, 0.92)),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 118, 110, 0.08) 1px, transparent 1px),
    linear-gradient(135deg, transparent 0 54%, rgba(249, 115, 22, 0.07) 54% 55%, transparent 55%);
  background-size: 48px 48px, 48px 48px, 100% 100%;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.72) 0 34%, transparent 34% 100%),
    linear-gradient(180deg, transparent 0 60%, rgba(15, 118, 110, 0.06) 60% 100%);
}

@media (prefers-color-scheme: dark) {
  body {
    background:
      linear-gradient(180deg, rgba(11, 17, 24, 0.97), rgba(11, 17, 24, 0.94)),
      var(--bg);
  }

  body::before {
    background-image:
      linear-gradient(rgba(96, 165, 250, 0.08) 1px, transparent 1px),
      linear-gradient(90deg, rgba(45, 212, 191, 0.07) 1px, transparent 1px),
      linear-gradient(135deg, transparent 0 54%, rgba(251, 146, 60, 0.07) 54% 55%, transparent 55%);
  }

  body::after {
    background:
      linear-gradient(115deg, rgba(17, 25, 35, 0.78) 0 34%, transparent 34% 100%),
      linear-gradient(180deg, transparent 0 60%, rgba(20, 184, 166, 0.05) 60% 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}

a {
  color: inherit;
  text-decoration: none;
}

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

::selection {
  background: rgba(15, 118, 110, 0.22);
  color: var(--text);
}

/* =========================================
   Layout
   ========================================= */
.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

main {
  padding: 0 0 5rem;
}

section {
  margin-bottom: clamp(4rem, 8vw, 7rem);
  scroll-margin-top: 96px;
}

/* =========================================
   Header
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0.85rem 0;
  background: var(--surface-elev);
  border-bottom: 1px solid var(--border-soft);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  margin: 0;
  padding-left: 0.82rem;
  color: var(--text);
  font-size: 1rem;
  font-weight: 860;
  letter-spacing: 0.08em;
  line-height: 1.2;
  position: relative;
  text-transform: uppercase;
}

.logo::before {
  content: "";
  position: absolute;
  top: 0.05rem;
  bottom: 0.05rem;
  left: 0;
  width: 4px;
  border-radius: 999px;
  background: var(--grad-brand);
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.12rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0.5rem 0.82rem;
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-size: 0.88rem;
  font-weight: 720;
  letter-spacing: 0.01em;
  position: relative;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}

nav a::after {
  content: "";
  position: absolute;
  right: 0.82rem;
  bottom: 0.36rem;
  left: 0.82rem;
  height: 2px;
  border-radius: 999px;
  background: var(--grad-brand);
  opacity: 0;
  transform: scaleX(0.2);
  transform-origin: left center;
  transition: opacity var(--t-fast), transform var(--t-fast);
}

nav a:hover {
  background: var(--grad-soft);
  color: var(--text);
  transform: translateY(-1px);
}

nav a:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

nav a:focus-visible,
.btn:focus-visible,
.back-link:focus-visible,
.to-top:focus-visible,
.hobby-card:focus-visible,
.showcase-card:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
}

/* =========================================
   Buttons
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 42px;
  padding: 0.66rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text);
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 780;
  line-height: 1.2;
  overflow: hidden;
  position: relative;
  text-decoration: none;
  transition: transform var(--t-fast), box-shadow var(--t-med), background var(--t-med), color var(--t-med), border-color var(--t-med);
}

.btn::after {
  content: "\2192";
  font-weight: 860;
  transition: transform var(--t-fast);
}

.btn:hover::after {
  transform: translateX(3px);
}

.btn.link {
  background: var(--surface);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.btn.link:hover {
  border-color: rgba(15, 118, 110, 0.45);
  box-shadow: var(--shadow-md);
  color: var(--brand);
  transform: translateY(-2px);
}

.btn.primary {
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
  color: #fff;
}

.btn.primary:hover {
  box-shadow: 0 22px 52px rgba(15, 118, 110, 0.22), 0 22px 52px rgba(37, 99, 235, 0.18);
  transform: translateY(-2px);
}

/* =========================================
   Section header
   ========================================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.55rem;
  color: var(--brand);
  font-size: 0.73rem;
  font-weight: 860;
  letter-spacing: 0.16em;
  line-height: 1.2;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  border-radius: 999px;
  background: var(--grad-brand);
}

.section-header {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.55rem;
}

.section-header h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.65rem, 2.5vw, 2.4rem);
  font-weight: 860;
  letter-spacing: 0;
  line-height: 1.22;
}

.section-lead {
  max-width: 60ch;
  margin: 0;
  color: var(--text-muted);
}

/* =========================================
   Hero
   ========================================= */
#hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  min-height: min(760px, calc(100vh - 72px));
  margin-top: 0;
  padding: clamp(3.6rem, 7vw, 6.5rem) 0 clamp(3rem, 6vw, 5rem);
  position: relative;
}

#hero::before {
  content: "Portfolio";
  position: absolute;
  top: clamp(1.2rem, 3vw, 2.2rem);
  right: 0;
  z-index: -1;
  color: rgba(17, 24, 39, 0.045);
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.9;
}

@media (prefers-color-scheme: dark) {
  #hero::before {
    color: rgba(238, 244, 248, 0.045);
  }
}

.hero-content {
  min-width: 0;
}

.hero-content h2 {
  max-width: 100%;
  margin: 0.4rem 0 0.85rem;
  background: var(--grad-text);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  font-size: clamp(2.35rem, 4.6vw, 3.9rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.04;
  overflow-wrap: normal;
  word-break: keep-all;
}

.hero-content .eyebrow {
  color: var(--accent);
}

.lead {
  max-width: 46ch;
  margin: 0 0 1.45rem;
  color: var(--text-soft);
  font-size: clamp(1rem, 1.3vw, 1.12rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.72rem;
}

.hero-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  grid-template-rows: repeat(2, minmax(142px, 1fr));
  gap: 0.78rem;
  min-height: 408px;
  perspective: 1200px;
}

.showcase-card {
  display: block;
  min-height: 0;
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  position: relative;
  transform: translateY(16px) rotateX(2deg);
  animation: cardIn 0.72s var(--ease) both;
  animation-delay: calc(var(--reveal-index, 0) * 70ms);
}

.showcase-card--large {
  grid-row: 1 / span 2;
}

.showcase-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.08) contrast(1.02);
  transition: transform var(--t-slow), filter var(--t-med);
}

.showcase-card--large img {
  object-position: center;
}

.showcase-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, transparent 28%, rgba(0, 0, 0, 0.68) 100%),
    linear-gradient(135deg, rgba(15, 118, 110, 0.18), transparent 48%);
  opacity: 0.95;
  transition: opacity var(--t-med);
}

.showcase-label {
  position: absolute;
  right: 0.8rem;
  bottom: 0.78rem;
  left: 0.8rem;
  z-index: 2;
  color: #fff;
  font-size: 0.84rem;
  font-weight: 860;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.showcase-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.showcase-card:hover img {
  filter: saturate(1.16) contrast(1.04);
  transform: scale(1.045);
}

.showcase-card:hover::before {
  opacity: 0.82;
}

@keyframes cardIn {
  from {
    opacity: 0;
    transform: translateY(24px) rotateX(8deg) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) rotateX(0deg) scale(1);
  }
}

/* =========================================
   About / cards
   ========================================= */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.info-card,
.work {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(255, 255, 255, 0.96)),
    var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
  transition: transform var(--t-med), box-shadow var(--t-med), border-color var(--t-med);
}

@media (prefers-color-scheme: dark) {
  .info-card,
  .work {
    background:
      linear-gradient(180deg, rgba(22, 34, 49, 0.82), rgba(17, 25, 35, 0.96)),
      var(--surface);
  }
}

.info-card {
  padding: 1.3rem 1.4rem;
}

.info-card::before,
.work::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--grad-brand);
  opacity: 0.88;
}

.info-card:hover,
.work:hover {
  border-color: rgba(15, 118, 110, 0.34);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.info-card.single {
  display: grid;
  align-content: center;
  min-height: 140px;
}

.info-card p {
  margin: 0;
  color: var(--text-soft);
}

.info-card strong {
  color: var(--text);
}

/* =========================================
   Skill chips
   ========================================= */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.62rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.46rem;
  min-height: 38px;
  padding: 0.48rem 0.82rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-elev);
  box-shadow: var(--shadow-sm);
  color: var(--text-soft);
  font-size: 0.9rem;
  font-weight: 760;
  line-height: 1.2;
  transform: translateY(0);
  transition: transform var(--t-fast), border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-med);
}

.chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.14);
}

.chip:nth-child(3n + 1)::before {
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.13);
}

.chip:nth-child(3n + 2)::before {
  background: var(--brand-2);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.13);
}

.chip:hover {
  border-color: rgba(37, 99, 235, 0.36);
  box-shadow: var(--shadow-md);
  color: var(--text);
  transform: translateY(-2px);
}

/* =========================================
   Works
   ========================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}

.work {
  display: flex;
  min-height: 238px;
  flex-direction: column;
  padding: 1.28rem 1.32rem 1.24rem;
}

.work::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 74px;
  height: 74px;
  background: linear-gradient(135deg, transparent 0 49%, rgba(37, 99, 235, 0.12) 50% 100%);
  opacity: 0;
  transition: opacity var(--t-med), transform var(--t-med);
}

.work:nth-child(3n + 1)::before {
  background: var(--brand);
}

.work:nth-child(3n + 2)::before {
  background: var(--brand-2);
}

.work:nth-child(3n)::before {
  background: var(--accent);
}

.work:hover::after {
  opacity: 1;
  transform: translate(-4px, 4px);
}

.work h3 {
  margin: 0 0 0.55rem;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 820;
  letter-spacing: 0;
  line-height: 1.42;
}

.work .description {
  flex: 1;
  margin: 0 0 1rem;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.work .btn.link {
  align-self: flex-start;
}

/* =========================================
   Contact
   ========================================= */
.contact-placeholder {
  margin-top: 1rem;
  padding: 1.35rem 1.2rem;
  border: 1px dashed rgba(37, 99, 235, 0.36);
  border-radius: var(--radius-lg);
  background:
    repeating-linear-gradient(135deg, rgba(37, 99, 235, 0.055) 0 8px, transparent 8px 16px),
    var(--surface-elev);
  color: var(--text-muted);
  font-weight: 780;
  letter-spacing: 0.08em;
  text-align: center;
}

/* =========================================
   Hobby grid
   ========================================= */
.hobby-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.hobby-card {
  display: block;
  min-height: 260px;
  border-radius: var(--radius-lg);
  background: #111827;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  isolation: isolate;
  overflow: hidden;
  position: relative;
  transition: transform var(--t-med), box-shadow var(--t-med);
}

.hobby-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.74) saturate(1.04);
  transform: scale(1.01);
  transition: transform var(--t-slow), filter var(--t-med);
}

.hobby-card .overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.24rem;
  padding: 1.08rem;
  background:
    linear-gradient(180deg, transparent 34%, rgba(17, 24, 39, 0.72) 100%),
    linear-gradient(135deg, rgba(15, 118, 110, 0.22), transparent 42%);
  color: #fff;
}

.overlay-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 880;
  letter-spacing: 0;
  line-height: 1.2;
}

.overlay-text {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 0.9rem;
}

.hobby-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

.hobby-card:hover img {
  filter: brightness(0.6) saturate(1.14);
  transform: scale(1.07);
}

.hobby-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-med);
}

.hobby-card:hover::after {
  opacity: 1;
}

/* =========================================
   Footer
   ========================================= */
footer {
  padding: 2.2rem 1rem 2.5rem;
  border-top: 1px solid var(--border-soft);
  background: var(--surface-elev);
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

footer p {
  margin: 0;
}

/* =========================================
   Back to top
   ========================================= */
.to-top {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 999;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: var(--radius-md);
  background: var(--grad-brand);
  box-shadow: var(--shadow-brand);
  color: #fff;
  font-size: 1.15rem;
  font-weight: 860;
  opacity: 0;
  pointer-events: none;
  transform: translateY(18px);
  transition: opacity var(--t-med), transform var(--t-med);
}

.to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

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

/* =========================================
   Scroll reveal
   ========================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.72s var(--ease), transform 0.72s var(--ease);
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.reveal.in .work,
.reveal.in .chip,
.reveal.in .hobby-card {
  animation: itemRise 0.62s var(--ease) both;
  animation-delay: calc(var(--reveal-index, 0) * 42ms);
}

@keyframes itemRise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================
   Sub-page header
   ========================================= */
.subpage-header {
  margin-bottom: 2.4rem;
  padding: 2.6rem 0 1.35rem;
  border-bottom: 1px solid var(--border-soft);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), transparent),
    transparent;
}

.subpage-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.subpage-header h1 {
  margin: 0.35rem 0 0;
  color: var(--text);
  font-size: clamp(1.62rem, 3vw, 2.35rem);
  font-weight: 880;
  letter-spacing: 0;
  line-height: 1.2;
}

.subpage-header nav ul {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.36rem;
  min-height: 38px;
  padding: 0.48rem 0.78rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-elev);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 740;
  line-height: 1.2;
  transition: color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}

.back-link::before {
  content: "\2190";
  font-weight: 860;
}

.back-link:hover {
  border-color: rgba(15, 118, 110, 0.42);
  color: var(--brand);
  transform: translateX(-2px);
}

.prose {
  max-width: 72ch;
}

.prose h2 {
  margin: 1.6rem 0 0.6rem;
  color: var(--text);
  font-size: 1.38rem;
  font-weight: 840;
  line-height: 1.3;
}

.prose p {
  margin: 0 0 1rem;
  color: var(--text-soft);
}

.link-list {
  display: grid;
  gap: 0.62rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
}

.link-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 52px;
  padding: 0.92rem 1rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  background: var(--surface-elev);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  font-weight: 740;
  line-height: 1.35;
  transition: transform var(--t-fast), border-color var(--t-fast), box-shadow var(--t-med);
}

.link-list a::after {
  content: "\2192";
  color: var(--brand);
  font-weight: 860;
  transition: transform var(--t-fast);
}

.link-list a:hover {
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.link-list a:hover::after {
  transform: translateX(3px);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 980px) {
  #hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 3rem;
  }

  .hero-content h2 {
    max-width: 100%;
  }

  .hero-showcase {
    min-height: 360px;
  }
}

@media (max-width: 780px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .site-header {
    padding: 0.68rem 0;
  }

  .nav-row {
    align-items: flex-start;
  }

  nav ul {
    justify-content: flex-end;
  }

  nav a {
    min-height: 34px;
    padding: 0.42rem 0.62rem;
    font-size: 0.82rem;
  }

  section {
    margin-bottom: 3.8rem;
  }
}

@media (max-width: 640px) {
  .nav-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.62rem;
  }

  .logo {
    padding-left: 0;
    text-align: center;
  }

  .logo::before {
    display: none;
  }

  nav ul {
    justify-content: center;
  }

  .hero-actions {
    width: 100%;
  }

  .btn {
    flex: 1 1 150px;
  }

  .hero-showcase {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(3, 180px);
    min-height: auto;
  }

  .showcase-card--large {
    grid-row: auto;
  }

  .subpage-header .container {
    align-items: flex-start;
  }

  .back-link {
    width: 100%;
    justify-content: center;
  }
}