/* 位元數位 A Bit Digital Studio — 亮／暗主題、黑白介面；標語橘色 #ff6d00 */

:root {
  --font-sans: "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  /* 品牌標準字（與標準字／字標用字一致）；缺字時由 DM Sans 承接（含中文） */
  --font-brand: "Bitcount Single", var(--font-sans);

  --accent-tagline: #ff6d00;
  --accent-tagline-dim: #e85f00;

  --focus-ring: #ff6d00;

  --header-h: 4rem;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
}

html[data-theme="light"] {
  --bg: #f7f7f7;
  --bg-alt: #ececec;
  --surface: #ffffff;
  --text: #0a0a0a;
  --text-muted: #525252;
  --border: #d4d4d4;
  --border-subtle: #e5e5e5;
  --grid-fg: rgba(10, 10, 10, 0.055);
  --bits: rgba(10, 10, 10, 0.04);
  --header-bg: rgba(247, 247, 247, 0.88);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  --logo-pad-bg: #141414;
  --hero-glow: rgba(255, 109, 0, 0.14);
  --hero-board-shadow: 0 24px 48px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(255, 109, 0, 0.08);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.1);
}

html[data-theme="dark"] {
  --bg: #080808;
  --bg-alt: #101010;
  --surface: #161616;
  --text: #fafafa;
  --text-muted: #a3a3a3;
  --border: #404040;
  --border-subtle: #262626;
  --grid-fg: rgba(255, 255, 255, 0.055);
  --bits: rgba(255, 255, 255, 0.045);
  --header-bg: rgba(8, 8, 8, 0.88);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
  --logo-pad-bg: #0e0e0e;
  --hero-glow: rgba(255, 109, 0, 0.1);
  --hero-board-shadow: 0 28px 56px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 109, 0, 0.12);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  --card-shadow-hover: 0 20px 48px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

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

  .hero__inner > *,
  .card:hover {
    animation: none;
    transform: none;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.25s var(--ease-out), color 0.25s var(--ease-out);
}

body.is-loading {
  overflow: hidden;
}

/* —— Page loader —— */

.page-loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity 0.55s var(--ease-out), visibility 0s linear 0.55s;
}

.page-loader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.page-loader__bg {
  pointer-events: none;
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--grid-fg) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-fg) 1px, transparent 1px);
  background-size: 20px 20px;
  mask-image: radial-gradient(ellipse 65% 55% at 50% 45%, black 10%, transparent 72%);
}

.page-loader__bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 50% 40% at 50% 42%,
    var(--hero-glow) 0%,
    transparent 70%
  );
}

.page-loader__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  width: min(18rem, calc(100% - 2.5rem));
  transition: transform 0.55s var(--ease-out), opacity 0.45s var(--ease-out);
}

.page-loader.is-done .page-loader__panel {
  transform: translateY(-10px) scale(0.97);
  opacity: 0;
}

.page-loader__logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.1rem 1.35rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--logo-pad-bg);
  box-shadow: var(--hero-board-shadow);
}

html[data-theme="light"] .page-loader__logo-wrap {
  border-color: #333;
}

.page-loader__logo {
  display: block;
  width: 4.5rem;
  height: auto;
  animation: loader-logo-pulse 1.6s var(--ease-out) infinite;
}

@keyframes loader-logo-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.04);
    opacity: 0.92;
  }
}

.page-loader__bits {
  display: flex;
  gap: 0.35rem;
}

.page-loader__bit {
  width: 0.55rem;
  height: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: transparent;
  animation: loader-bit 1.1s var(--ease-out) infinite;
}

.page-loader__bit:nth-child(1) {
  animation-delay: 0s;
}

.page-loader__bit:nth-child(2) {
  animation-delay: 0.08s;
}

.page-loader__bit:nth-child(3) {
  animation-delay: 0.16s;
}

.page-loader__bit:nth-child(4) {
  animation-delay: 0.24s;
}

.page-loader__bit:nth-child(5) {
  animation-delay: 0.32s;
}

.page-loader__bit:nth-child(6) {
  animation-delay: 0.4s;
}

.page-loader__bit:nth-child(7) {
  animation-delay: 0.48s;
}

.page-loader__bit:nth-child(8) {
  animation-delay: 0.56s;
}

@keyframes loader-bit {
  0%,
  100% {
    background: transparent;
    border-color: var(--border);
    transform: scale(1);
  }

  45% {
    background: var(--accent-tagline);
    border-color: var(--accent-tagline);
    transform: scale(1.12);
    box-shadow: 0 0 10px rgba(255, 109, 0, 0.35);
  }
}

.page-loader__track {
  width: 100%;
  height: 3px;
  border-radius: 999px;
  background: var(--border-subtle);
  overflow: hidden;
}

.page-loader__fill {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-tagline-dim), var(--accent-tagline));
  transition: width 0.35s var(--ease-out);
}

.page-loader.is-progressing .page-loader__fill {
  width: 72%;
  transition-duration: 0.9s;
}

.page-loader.is-done .page-loader__fill {
  width: 100%;
  transition-duration: 0.2s;
}

.page-loader__label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: lowercase;
}

@media (prefers-reduced-motion: reduce) {
  .page-loader__logo,
  .page-loader__bit {
    animation: none;
  }

  .page-loader.is-done .page-loader__panel {
    transform: none;
  }

  .page-loader {
    transition-duration: 0.2s;
  }
}

::selection {
  background: rgba(255, 109, 0, 0.28);
  color: var(--text);
}

[id] {
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus {
  top: 1rem;
  outline: none;
}

.skip-link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

/* —— Header —— */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-subtle);
  box-shadow: var(--shadow);
}

.site-header__inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-right: auto;
  text-decoration: none;
  color: var(--text);
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.site-logo:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

.site-logo__img-wrap {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  height: 2.25rem;
  padding: 0.2rem 0.4rem;
  border-radius: 0.375rem;
  border: 1px solid transparent;
}

html[data-theme="light"] .site-logo__img-wrap {
  background: var(--logo-pad-bg);
  border-color: #2a2a2a;
}

html[data-theme="dark"] .site-logo__img-wrap {
  border-color: var(--border-subtle);
}

.site-logo__img {
  display: block;
  height: 1.75rem;
  width: auto;
  max-height: 100%;
  object-fit: contain;
}

.site-nav {
  display: flex;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  position: relative;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color 0.15s;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.35rem;
  height: 2px;
  background: var(--accent-tagline);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s var(--ease-out);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface);
  cursor: pointer;
  color: var(--text);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.nav-toggle__bar {
  display: block;
  width: 1.125rem;
  height: 2px;
  margin: 0 auto;
  background: currentColor;
  border-radius: 1px;
  transition: transform 0.2s var(--ease-out), opacity 0.2s;
}

.site-header.is-open .nav-toggle__bar:first-child {
  transform: translateY(4px) rotate(45deg);
}

.site-header.is-open .nav-toggle__bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

.theme-toggle {
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface);
  cursor: pointer;
  color: var(--text);
  display: grid;
  place-items: center;
  position: relative;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-toggle__icon {
  position: absolute;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  border: 2px solid currentColor;
  transition: opacity 0.2s, transform 0.2s var(--ease-out);
}

.theme-toggle__icon--sun {
  border-width: 2px;
  box-shadow: inset 0 -5px 0 0 currentColor;
  opacity: 0;
  transform: scale(0.5);
}

.theme-toggle__icon--moon {
  border: none;
  border-radius: 50%;
  box-shadow: inset 0.48rem -0.05rem 0 0 currentColor;
  transform: rotate(-18deg) scale(0.5);
  opacity: 0;
}

html[data-theme="light"] .theme-toggle__icon--sun {
  opacity: 1;
  transform: scale(1);
}

html[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: rotate(-18deg) scale(1);
}

@media (max-width: 52rem) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    max-height: 0;
    overflow: hidden;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    transition: max-height 0.35s var(--ease-out);
  }

  .site-header.is-open .site-nav {
    max-height: 16rem;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 1.25rem;
    gap: 0;
  }

  .site-nav__list li a {
    display: block;
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--border-subtle);
  }

  .site-nav__list li:last-child a {
    border-bottom: none;
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav a[aria-current="page"] {
    color: var(--accent-tagline);
  }
}

/* —— Hero —— */

.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 1.25rem clamp(4rem, 10vw, 7rem);
  overflow: hidden;
}

.hero__bg {
  pointer-events: none;
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--grid-fg) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-fg) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 28%, black 15%, transparent 72%);
}

.hero__bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 55% 45% at 50% 22%,
    var(--hero-glow) 0%,
    transparent 68%
  );
}

.hero__bg::after {
  content: "01001000 01101001 00100000 01100010 01101001 01110100";
  position: absolute;
  left: 50%;
  top: 18%;
  transform: translate(-50%, -50%) rotate(-4deg);
  font-family: var(--font-mono);
  font-size: clamp(0.65rem, 1.2vw, 0.75rem);
  color: var(--bits);
  white-space: nowrap;
  letter-spacing: 0.35em;
}

.hero__inner {
  position: relative;
  max-width: 48rem;
  margin: 0 auto;
  text-align: center;
}

@media (prefers-reduced-motion: no-preference) {
  .hero__inner > * {
    animation: hero-rise 0.75s var(--ease-out) backwards;
  }

  .hero__mono {
    animation-delay: 0.04s;
  }

  .hero__brand {
    animation-delay: 0.1s;
  }

  .hero__title {
    animation-delay: 0.18s;
  }

  .hero__subtitle {
    animation-delay: 0.22s;
  }

  .hero__tagline {
    animation-delay: 0.28s;
  }

  .hero__actions {
    animation-delay: 0.36s;
  }
}

@keyframes hero-rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__mono {
  display: inline-block;
  margin: 0 0 1.5rem;
  padding: 0.35rem 0.75rem;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 72%, transparent);
}

.hero__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin-bottom: 1.75rem;
}

.hero__flip-card {
  width: 100%;
  max-width: 36rem;
  perspective: 1400px;
}

.hero__flip-card-inner {
  position: relative;
  display: block;
  width: 100%;
  min-height: clamp(11.5rem, 32vw, 13.25rem);
  padding: 0;
  border: none;
  border-radius: var(--radius-xl);
  background: transparent;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.75s var(--ease-out);
  -webkit-transform-style: preserve-3d;
}

.hero__flip-card-inner:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

.hero__flip-card-inner.is-flipped {
  transform: rotateY(180deg);
}

.hero__flip-hint {
  position: absolute;
  right: 0.85rem;
  bottom: 0.65rem;
  z-index: 2;
  padding: 0.2rem 0.5rem;
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: lowercase;
  color: var(--text-muted);
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  pointer-events: none;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.hero__flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.25rem, 3.5vw, 1.75rem) clamp(1.25rem, 3.5vw, 2rem);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--hero-board-shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

html[data-theme="light"] .hero__flip-face {
  background: linear-gradient(165deg, #1a1a1a 0%, var(--logo-pad-bg) 55%, #0f0f0f 100%);
  border-color: #333;
}

html[data-theme="dark"] .hero__flip-face {
  background: linear-gradient(165deg, #1c1c1c 0%, var(--logo-pad-bg) 50%, #121212 100%);
  border-color: var(--border);
}

.hero__flip-face--back {
  transform: rotateY(180deg);
}

.hero__logo {
  display: block;
  width: min(100%, 220px);
  height: auto;
}

.hero__flip-contact {
  width: 100%;
  max-width: 20rem;
  text-align: center;
}

.hero__flip-contact-eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-tagline);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: lowercase;
}

.hero__flip-contact-label {
  margin: 0 0 0.35rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero__flip-contact-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(0.6875rem, 2.2vw, 0.8125rem);
  line-height: 1.45;
  font-weight: 500;
  color: #fafafa;
  text-decoration: none;
  word-break: break-all;
  transition: color 0.15s;
}

.hero__flip-contact-link:hover {
  color: var(--accent-tagline);
}

.hero__flip-contact-link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
  .hero__flip-card-inner {
    transition-duration: 0.01ms;
  }
}

.hero__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-brand);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero__subtitle {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.hero__tagline {
  margin: 0 auto 1.5rem;
  max-width: 100%;
  font-family: var(--font-brand);
  font-size: clamp(1.35rem, 5.5vw, 2.65rem);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent-tagline);
  text-wrap: balance;
  filter: drop-shadow(0 2px 16px rgba(255, 109, 0, 0.15));
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

/* —— Buttons —— */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.15s;
}

.btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.06);
}

.btn--primary:hover {
  transform: translateY(-2px);
  background: var(--accent-tagline);
  border-color: var(--accent-tagline);
  color: #fff;
  box-shadow: 0 8px 24px rgba(255, 109, 0, 0.28);
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--outline:hover {
  background: var(--bg-alt);
  border-color: var(--text-muted);
}

/* —— Sections —— */

.section {
  padding: clamp(3rem, 6vw, 5rem) 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.section--alt {
  background: var(--bg-alt);
}

.section__inner {
  max-width: 52rem;
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: 36rem;
}

.section__eyebrow {
  margin: 0 0 0.65rem;
  color: var(--accent-tagline);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: lowercase;
}

.section__title {
  margin: 0 0 1rem;
  font-family: var(--font-brand);
  font-size: clamp(1.35rem, 2.8vw, 1.625rem);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.section--about .section__lead {
  margin: 0;
  padding-left: 1.25rem;
  max-width: 38rem;
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  line-height: 1.8;
  color: var(--text-muted);
  border-left: 3px solid var(--accent-tagline);
}

.section__lead {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.0625rem;
}

.cards {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.card {
  position: relative;
  padding: 1.5rem 1.35rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.25s var(--ease-out), transform 0.25s var(--ease-out);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-tagline), var(--accent-tagline-dim));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s var(--ease-out);
}

.card:hover {
  border-color: color-mix(in srgb, var(--accent-tagline) 35%, var(--border));
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-3px);
}

.card:hover::before {
  transform: scaleX(1);
}

.card__index {
  display: block;
  margin-bottom: 0.85rem;
  color: var(--accent-tagline);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.card__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-brand);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card__text {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* —— Footer —— */

.site-footer {
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-alt);
}

.site-footer__inner {
  max-width: 72rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer__copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.site-footer__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.15s, color 0.15s;
}

.site-footer__link:hover {
  border-bottom-color: var(--accent-tagline);
  color: var(--accent-tagline-dim);
}

.site-footer__link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

/* —— Legal / copyright page —— */

.legal-main {
  padding: clamp(2.5rem, 5vw, 4rem) 1.25rem clamp(4rem, 8vw, 6rem);
}

.legal-page {
  max-width: 42rem;
  margin: 0 auto;
}

.legal-page__title {
  margin: 0 0 2rem;
  padding-bottom: 1rem;
  font-family: var(--font-brand);
  font-size: clamp(1.75rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-page__title::after {
  content: "";
  display: block;
  width: 3rem;
  height: 3px;
  margin-top: 1rem;
  background: var(--accent-tagline);
  border-radius: 2px;
}

.legal-section {
  margin-bottom: 2.25rem;
}

.legal-section__title {
  margin: 0 0 0.75rem;
  font-family: var(--font-brand);
  font-size: 1.125rem;
  font-weight: 700;
}

.legal-section p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.legal-section p:last-child {
  margin-bottom: 0;
}

.legal-page__date {
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--text);
}

.legal-list {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.legal-list a {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.legal-list a:hover {
  color: var(--accent-tagline-dim);
}

.legal-list a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 0.2rem;
}

.legal-back {
  margin: 2.5rem 0 0;
}