/* ==========================================================================
   home.css — home page only · Polish Phase P1
   Editorial asymmetric hero · inline countdown · magazine TOC menu
   ========================================================================== */

/* ---------- site header (shared look) ------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
  background: rgba(244, 237, 225, 0.92);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: saturate(1.1);
}
.site-header .brand {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
}
.site-header nav a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.68;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.site-header nav a:hover,
.site-header nav a:focus-visible { opacity: 1; }

/* ==========================================================================
   HERO · asymmetric editorial cover
   ========================================================================== */
.hero {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 5rem) clamp(1.25rem, 4vw, 3rem) clamp(3rem, 7vw, 6rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
}

/* top rail · eyebrow + date · two columns on wide */
.hero-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding-bottom: clamp(0.75rem, 2vw, 1.25rem);
  border-bottom: 1px solid var(--hairline);
}
.hero-rail .eyebrow { opacity: 0.8; }
.hero-rail .hero-coords {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  opacity: 0.72;
  text-transform: uppercase;
}
@media (min-width: 720px) {
  .hero-rail {
    grid-template-columns: 1fr auto;
    align-items: baseline;
  }
}

/* the big word · P5 · more dramatic cap, tighter optical sync */
.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(4rem, 20vw, 17rem);
  line-height: 0.82;
  letter-spacing: -0.055em;
  color: var(--ink);
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.hero-title .latin {
  display: block;
  letter-spacing: -0.06em;
}
.hero-title .zht {
  display: flex;
  align-items: baseline;
  gap: 0.6em;
  font-size: 0.24em;
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.03em;
  opacity: 0.72;
  margin-top: clamp(0.5rem, 1vw, 0.85rem);
  padding-left: 0.08em;
}
.hero-title .zht::before {
  content: "";
  display: inline-block;
  flex: 0 0 1.6em;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
  transform: translateY(-0.35em);
}

/* lede + meta · asymmetric split · lede takes 3 cols, meta 2 on wide */
.hero-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  padding-top: clamp(0.5rem, 1.5vw, 1rem);
}
@media (min-width: 880px) {
  .hero-body {
    grid-template-columns: 3fr 2fr;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }
}
/* P5 · at 1280+ stack hero-body so the 4-col meta rail spans full width */
@media (min-width: 1280px) {
  .hero-body {
    grid-template-columns: 1fr;
    gap: clamp(2rem, 3.5vw, 3rem);
  }
  .hero-lede {
    max-width: 52ch;
  }
}
.hero-lede {
  max-width: 46ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.hero-lede strong {
  font-style: normal;
  font-weight: 900;
  letter-spacing: -0.02em;
}

/* metadata · 編輯格 · P5 · 1×4 editorial rail on wide, 2×2 on tablet, 1-col on mobile */
.hero-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--hairline);
}
.hero-meta > div {
  padding: clamp(0.75rem, 1.5vw, 1rem) 0;
  border-bottom: 1px solid var(--hairline);
}
.hero-meta > div:nth-child(odd) {
  padding-right: 1rem;
  border-right: 1px solid var(--hairline);
}
.hero-meta > div:nth-child(even) {
  padding-left: 1rem;
}
/* P5 · lock hero-meta to the right column beneath lede on wide, single 4-col rail at 1280+ */
@media (min-width: 1280px) {
  .hero-meta--quad {
    grid-template-columns: repeat(4, 1fr);
    border-bottom: 1px solid var(--hairline);
  }
  .hero-meta--quad > div {
    padding: 1rem 1.1rem;
    border-right: 1px solid var(--hairline);
    border-bottom: 0 !important;
  }
  .hero-meta--quad > div:first-child { padding-left: 0; }
  .hero-meta--quad > div:last-child { border-right: 0; padding-right: 0; }
  .hero-meta--quad > div:nth-child(odd),
  .hero-meta--quad > div:nth-child(even) {
    padding-left: 1.1rem;
    padding-right: 1.1rem;
  }
  .hero-meta--quad > div:first-child { padding-left: 0; }
  .hero-meta--quad > div:last-child { padding-right: 0; }
}
.hero-meta dt {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: 0.35rem;
}
.hero-meta dd {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1rem, 2vw, 1.375rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0;
}
/* C1 · compact 2×2 quad — lets hero-title keep visual dominance */
.hero-meta--quad dd {
  font-size: clamp(0.95rem, 1.4vw, 1.125rem);
  font-weight: 600;
}
.hero-meta--quad dd small {
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  opacity: 0.82;
}
.hero-meta--quad dt {
  font-size: 0.58rem;
  letter-spacing: 0.22em;
}
.hero-meta dd small {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  opacity: 0.75;
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   COUNTDOWN · inline editorial · not a dashboard timer
   ========================================================================== */
.countdown-inline {
  max-width: 1400px;
  margin: 0 auto;
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 4vw, 3rem);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  align-items: baseline;
}
@media (min-width: 720px) {
  .countdown-inline {
    grid-template-columns: auto 1fr auto;
    gap: clamp(1.25rem, 3vw, 2rem);
  }
}
.countdown-inline .cd-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--moss);
}
.countdown-inline .cd-line {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.1rem, 2.4vw, 1.625rem);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--ink);
}
.countdown-inline .cd-line .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  padding: 0 0.12em;
  /* P5 · baseline underline marker instead of accent fill — 去色噪 */
  background-image: linear-gradient(transparent 80%, rgba(217, 126, 43, 0.32) 80%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
.countdown-inline .cd-line em {
  font-weight: 400;
  font-style: italic;
  color: #8f4b17;
  opacity: 1;
}
.countdown-inline .cd-line .sep {
  opacity: 0.28;
  margin: 0 0.32em;
  font-weight: 300;
  font-style: italic;
}
.countdown-inline .cd-flight {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.78;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.countdown-inline .in-trip,
.countdown-inline .post-trip {
  grid-column: 1 / -1;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--accent-text);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

/* ==========================================================================
   FLIGHT SUMMARY · outbound + return side-by-side panels
   ========================================================================== */
.flight-summary {
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1rem, 4vw, 2.5rem);
  background: var(--paper);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.flight-summary__inner {
  max-width: 1080px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2vw, 1.5rem);
}
@media (min-width: 768px) {
  .flight-summary__inner { grid-template-columns: 1fr 1fr; }
}
.flight-card {
  padding: clamp(1.35rem, 2.6vw, 1.9rem) clamp(1.25rem, 2.4vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 4px;
  position: relative;
}
.flight-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--ink);
}
.flight-card--ret::before { background: var(--accent-text); }
.flight-card__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.66;
  margin: 0 0 0.4rem;
}
.flight-card__no {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
  margin: 0 0 1.1rem;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
}
.flight-card__no b { font-weight: 900; }
.flight-card__no small {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.72;
  margin-left: 0;
}
.flight-card__leg {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: clamp(0.75rem, 2vw, 1.25rem);
  align-items: center;
  padding: 1rem 0 1.1rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.flight-leg {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}
.flight-leg + .flight-leg,
.flight-leg__sep + .flight-leg { text-align: right; align-items: flex-end; }
.flight-leg__time {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin: 0;
}
.flight-leg__code {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--accent-text);
  margin: 0.1rem 0 0;
}
.flight-leg__place {
  font-size: 0.75rem;
  line-height: 1.45;
  color: var(--ink);
  opacity: 0.72;
  margin: 0.05rem 0 0;
  letter-spacing: 0.005em;
}
/* replace the bare `→` with a hairline path + aircraft glyph */
.flight-leg__sep {
  position: relative;
  width: clamp(48px, 10vw, 96px);
  height: 14px;
  color: var(--ink);
  opacity: 0.5;
  font-family: var(--font-mono);
  font-size: 0;
  align-self: center;
}
.flight-leg__sep::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  border-top: 1px solid currentColor;
  transform: translateY(-0.5px);
}
.flight-leg__sep::after {
  content: "✈";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  font-size: 0.85rem;
  line-height: 1;
  background: var(--surface);
  padding: 0 0.35rem;
  color: currentColor;
}
.flight-card--ret .flight-leg__sep::after { transform: translate(-50%, -55%) scaleX(-1); }
.flight-card__meta {
  margin: 0.9rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
}
/* Stack legs vertically below 420 · rotate the path 90deg so it reads as up→down */
@media (max-width: 480px) {
  .flight-card__leg {
    grid-template-columns: 1fr;
    gap: 0.55rem;
    text-align: left;
    padding: 0.85rem 0 0.95rem;
  }
  .flight-leg + .flight-leg,
  .flight-leg__sep + .flight-leg { text-align: left; align-items: flex-start; }
  .flight-leg__sep {
    width: 14px;
    height: clamp(22px, 5vw, 30px);
    justify-self: start;
    margin-left: 0.15rem;
  }
  .flight-leg__sep::before {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    width: 0;
    height: 100%;
    border-top: 0;
    border-left: 1px solid currentColor;
    transform: translateX(-0.5px);
  }
  .flight-leg__sep::after {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) rotate(90deg);
    padding: 0.3rem 0;
  }
  .flight-card--ret .flight-leg__sep::after {
    transform: translate(-50%, -50%) rotate(90deg) scaleX(-1);
  }
}

/* ==========================================================================
   MAIN MENU · magazine table-of-contents · 6 rows
   ========================================================================== */
.main-menu {
  max-width: 1400px;
  margin: clamp(2rem, 5vw, 4rem) auto 0;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}
.main-menu-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: clamp(1rem, 2vw, 1.5rem);
  padding-bottom: clamp(0.5rem, 1vw, 0.75rem);
  border-bottom: 1px solid var(--ink);
}
.main-menu-heading .kicker { color: var(--ink); opacity: 0.72; }
.main-menu-heading .count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.75;
  font-variant-numeric: tabular-nums;
}
.main-menu-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.menu-card {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: clamp(1rem, 2vw, 1.5rem);
  align-items: baseline;
  padding: clamp(1.35rem, 3vw, 2.15rem) 0 clamp(1.35rem, 3vw, 2.15rem) 0;
  border-bottom: 1px solid var(--hairline);
}
.menu-card:last-child { border-bottom: 1px solid var(--ink); }
/* accent hairline that draws in from the left on hover — GPU-cheap */
.menu-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width 420ms var(--ease-editorial);
  pointer-events: none;
}

.menu-card .mn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink);
  opacity: 0.7;
  padding-top: 0.3rem;
  transition: color var(--dur-mid) var(--ease-editorial),
              opacity var(--dur-mid) var(--ease-editorial);
}
.menu-card h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 5vw, 3.25rem);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 0.4rem;
  color: var(--ink);
  transition: transform var(--dur-mid) var(--ease-editorial);
  transform-origin: left center;
}
.menu-card h3 em {
  font-weight: 300;
  font-style: italic;
  opacity: 0.72;
}
.menu-card .dek {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(0.95rem, 1.4vw, 1.125rem);
  line-height: 1.45;
  color: var(--ink);
  opacity: 0.72;
  max-width: 52ch;
}
.menu-card .arrow {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--ink);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--dur-mid) var(--ease-editorial),
              transform var(--dur-mid) var(--ease-editorial),
              color var(--dur-mid) var(--ease-editorial);
  padding-top: 0.2rem;
}

/* hover · GPU-only transforms · no layout shift */
.menu-card:hover,
.menu-card:focus-visible {
  outline: none;
}
.menu-card:hover::after,
.menu-card:focus-visible::after {
  width: 100%;
}
.menu-card:hover .mn,
.menu-card:focus-visible .mn {
  color: var(--accent-text);
  opacity: 1;
  transform: translateX(2px);
}
.menu-card:hover h3,
.menu-card:focus-visible h3 {
  transform: translateX(clamp(0.4rem, 1.2vw, 0.85rem));
}
.menu-card:hover .arrow,
.menu-card:focus-visible .arrow {
  opacity: 0.82;
  transform: translateX(0);
  color: var(--accent-text);
}
.menu-card .mn {
  transition: color 180ms var(--ease-out),
              opacity 180ms var(--ease-out),
              transform 320ms var(--ease-editorial);
}

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about {
  max-width: 680px;
  margin: clamp(4rem, 8vw, 7rem) auto clamp(3rem, 6vw, 5rem);
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}
.about .kicker {
  display: block;
  margin-bottom: 1rem;
}
.about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-bottom: 1.25rem;
}
.about h2 em {
  font-weight: 300;
  font-style: italic;
  opacity: 0.78;
}
.about p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  color: var(--ink);
  opacity: 0.82;
}
.about p:last-child { margin-bottom: 0; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  margin-top: clamp(3rem, 6vw, 5rem);
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.25rem, 4vw, 3rem) clamp(1.5rem, 3vw, 2rem);
  background: var(--ink);
  color: var(--paper);
}
.site-footer .footer-grid {
  max-width: 1400px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(244, 237, 225, 0.12);
}
.site-footer p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.72;
}
.site-footer .footer-affiliate {
  font-weight: 500;
  opacity: 0.92;
}
.site-footer .footer-ai-notice {
  max-width: 1400px;
  margin: 1.5rem auto 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(244, 237, 225, 0.16);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  line-height: 1.75;
  color: rgba(244, 237, 225, 0.7);
}
.site-footer .footer-ai-notice a { opacity: 0.95; }
.site-footer a {
  color: var(--accent);
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
}

/* signature · editorial sign-off */
.footer-sig {
  max-width: 1400px;
  margin: 1.5rem auto 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-sig .sign {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: 1.0625rem;
  color: var(--paper);
  opacity: 0.62;
  letter-spacing: 0.01em;
}
.footer-sig .build {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  opacity: 0.42;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 640px) {
  .site-footer .footer-grid { grid-template-columns: 2fr 1fr 1fr; gap: 3rem; }
}

/* ==========================================================================
   MOBILE adjustments
   ========================================================================== */
@media (max-width: 560px) {
  .hero-title { font-size: clamp(3.5rem, 22vw, 6rem); }
  .hero-title .zht { font-size: 0.34em; }
  .menu-card {
    grid-template-columns: 2.5rem 1fr;
  }
  .menu-card .arrow { display: none; }
  .menu-card h3 { font-size: clamp(1.5rem, 9vw, 2.25rem); }
  .hero-meta > div:nth-child(odd) { border-right: 0; padding-right: 0; }
  .hero-meta > div:nth-child(even) { padding-left: 0; }
  .hero-meta { grid-template-columns: 1fr; }
}