/* FillSlot OS — self-contained marketing styles (no CDN) */
:root {
  --ink: #1a2a32;
  --ink-soft: #3d525c;
  --mist: #e8f1f4;
  --foam: #f4fafb;
  --sea: #2a7a7b;
  --sea-deep: #1e5f60;
  --sea-soft: #c5e4e5;
  --sand-line: rgba(26, 42, 50, 0.08);
  --warn: #8a5a2b;
  --radius: 2px;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti TC", "STSong", "Noto Serif TC", serif;
  --font-body: "PingFang TC", "Hiragino Sans CNS", "Heiti TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  --max: 42rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  background:
    radial-gradient(120% 80% at 10% -10%, #d4ecee 0%, transparent 55%),
    radial-gradient(90% 60% at 100% 0%, #cfe3ea 0%, transparent 50%),
    linear-gradient(180deg, #eef6f7 0%, var(--foam) 38%, #f7fbfc 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 11px,
      rgba(42, 122, 123, 0.03) 11px,
      rgba(42, 122, 123, 0.03) 12px
    );
  z-index: 0;
}

a {
  color: var(--sea-deep);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--sea);
}

.site {
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 0.5rem;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark span {
  color: var(--sea);
  font-weight: 500;
}

.lang-tabs {
  display: inline-flex;
  gap: 0.15rem;
  border-bottom: 1px solid var(--sand-line);
}

.lang-tabs button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.9rem;
  padding: 0.35rem 0.7rem 0.5rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

.lang-tabs button[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--sea);
}

.lang-tabs button:focus-visible {
  outline: 2px solid var(--sea);
  outline-offset: 2px;
}

/* —— Hero: one composition —— */
.hero {
  position: relative;
  min-height: min(92vh, 46rem);
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero-plane {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(238, 246, 247, 0.92) 0%, rgba(238, 246, 247, 0.55) 42%, rgba(42, 122, 123, 0.18) 100%),
    radial-gradient(ellipse 70% 55% at 78% 42%, rgba(42, 122, 123, 0.35), transparent 70%),
    radial-gradient(ellipse 45% 40% at 62% 70%, rgba(30, 95, 96, 0.22), transparent 65%),
    linear-gradient(160deg, #b8d8dc 0%, #7fb0b4 45%, #4a8a8c 100%);
  animation: plane-breathe 12s var(--ease) infinite alternate;
}

.hero-plane::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 18%;
  width: min(52vw, 28rem);
  height: min(52vw, 28rem);
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow:
    inset 0 0 0 1px rgba(26, 42, 50, 0.06),
    0 0 0 2.5rem rgba(255, 255, 255, 0.08);
  animation: ring-drift 14s var(--ease) infinite alternate;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 68rem;
  margin: 0 auto;
  padding: 4.5rem 1.25rem 3.5rem;
  width: 100%;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  opacity: 0;
  transform: translateY(1.1rem);
  animation: rise-in 0.9s var(--ease) 0.12s forwards;
}

.hero-brand em {
  font-style: normal;
  color: var(--sea-deep);
}

.hero-lead {
  max-width: 28rem;
  margin: 0 0 1.75rem;
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  color: var(--ink-soft);
  opacity: 0;
  transform: translateY(1rem);
  animation: rise-in 0.9s var(--ease) 0.28s forwards;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  align-items: center;
  opacity: 0;
  transform: translateY(0.8rem);
  animation: rise-in 0.9s var(--ease) 0.44s forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  font: inherit;
  font-size: 1rem;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn-primary {
  background: var(--sea);
  color: #fff;
}

.btn-primary:hover {
  background: var(--sea-deep);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: rgba(26, 42, 50, 0.22);
}

.btn-ghost:hover {
  border-color: var(--sea);
  color: var(--sea-deep);
}

.section {
  max-width: 68rem;
  margin: 0 auto;
  padding: 3.25rem 1.25rem;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.5vw, 2rem);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.section > p.support {
  max-width: var(--max);
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
}

.flow {
  display: grid;
  gap: 1.25rem;
  max-width: 36rem;
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.flow li {
  position: relative;
  padding-left: 3rem;
  counter-increment: step;
}

.flow li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--sea-deep);
  border: 1px solid var(--sea-soft);
  background: rgba(197, 228, 229, 0.35);
}

.flow strong {
  display: block;
  margin-bottom: 0.2rem;
}

.not-box {
  max-width: var(--max);
  padding: 1.25rem 0;
  border-top: 1px solid var(--sand-line);
  border-bottom: 1px solid var(--sand-line);
}

.not-box ul {
  margin: 0.75rem 0 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.pilot {
  max-width: var(--max);
}

.pilot .price {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}

.pilot .note {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0 0 1.25rem;
}

.footer {
  max-width: 68rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--sand-line);
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 0.85rem;
}

.footer a {
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Language panels */
[data-lang-panel] {
  display: none;
}

[data-lang-panel].is-active {
  display: block;
}

/* Privacy / unsubscribe pages */
.page-main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.page-main h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.page-main .meta {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0 0 2rem;
}

.page-main h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 2rem 0 0.6rem;
}

.page-main p,
.page-main li {
  color: var(--ink-soft);
}

.page-main ul {
  padding-left: 1.2rem;
}

@keyframes rise-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes plane-breathe {
  from {
    filter: saturate(1);
  }
  to {
    filter: saturate(1.08) brightness(1.03);
  }
}

@keyframes ring-drift {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-3%, 4%) scale(1.04);
  }
}

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

  .hero-brand,
  .hero-lead,
  .cta-row {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 640px) {
  .hero {
    min-height: min(88vh, 40rem);
  }

  .hero-content {
    padding-top: 3rem;
  }

  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }
}