:root {
  color-scheme: dark;
  --bg: #111012;
  --panel: rgb(255 247 232 / 0.08);
  --panel-strong: rgb(255 247 232 / 0.13);
  --text: #fff7e8;
  --muted: rgb(255 247 232 / 0.72);
  --soft: rgb(255 247 232 / 0.48);
  --line: rgb(255 247 232 / 0.18);
  --accent: #d7a84f;
  --accent-ink: #18120a;
  --danger: #ffb1a2;
  --radius: 16px;
  font-family:
    "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgb(17 16 18 / 0.22), var(--bg) 82vh),
    var(--bg);
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 2;
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 4vw, 56px);
  background: linear-gradient(180deg, rgb(17 16 18 / 0.76), transparent);
}

.brand {
  display: inline-grid;
  gap: 1px;
  text-decoration: none;
  font-weight: 750;
  line-height: 1.08;
}

.brand span:last-child {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
}

nav a,
.site-footer a {
  color: var(--muted);
  text-decoration-color: transparent;
  text-underline-offset: 5px;
  transition:
    color 180ms ease,
    text-decoration-color 180ms ease;
}

nav a:hover,
.site-footer a:hover {
  color: var(--text);
  text-decoration-color: var(--accent);
}

.hero {
  position: relative;
  display: grid;
  min-height: 100dvh;
  align-items: end;
  overflow: hidden;
  padding: 96px clamp(20px, 6vw, 72px) 56px;
}

.hero::after {
  position: absolute;
  inset: auto 0 0;
  height: 34vh;
  content: "";
  background: linear-gradient(180deg, transparent, var(--bg));
  pointer-events: none;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgb(17 16 18 / 0.92), rgb(17 16 18 / 0.34) 58%, rgb(17 16 18 / 0.7)),
    linear-gradient(180deg, rgb(17 16 18 / 0.22), rgb(17 16 18 / 0.66));
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 58% center;
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(690px, 100%);
}

.kicker {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 8ch;
  margin-bottom: 22px;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(2rem, 5vw, 4.7rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.lede {
  max-width: 31rem;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.75;
}

.signup {
  display: grid;
  grid-template-columns: minmax(150px, 0.7fr) minmax(220px, 1fr) auto;
  gap: 12px;
  width: min(760px, 100%);
  align-items: end;
}

.field {
  display: grid;
  gap: 8px;
}

label {
  color: var(--muted);
  font-size: 0.9rem;
}

input {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: rgb(17 16 18 / 0.7);
  padding: 0 16px;
  font: inherit;
  outline: none;
  transition:
    border-color 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

input::placeholder {
  color: var(--soft);
}

input:focus {
  border-color: var(--accent);
  background: rgb(17 16 18 / 0.9);
  box-shadow: 0 0 0 4px rgb(215 168 79 / 0.18);
}

button {
  min-height: 52px;
  border: 0;
  border-radius: var(--radius);
  color: var(--accent-ink);
  background: var(--accent);
  padding: 0 26px;
  font: inherit;
  font-weight: 800;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform 160ms ease,
    filter 160ms ease;
}

button:hover {
  filter: brightness(1.06);
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  cursor: wait;
  filter: grayscale(0.25);
}

.form-note {
  grid-column: 1 / -1;
  min-height: 1.5em;
  margin: 0;
  color: var(--soft);
  font-size: 0.92rem;
  line-height: 1.6;
}

.form-note.error {
  color: var(--danger);
}

.form-note.success {
  color: var(--accent);
}

main > section:not(.hero) {
  padding: clamp(72px, 11vw, 150px) clamp(20px, 6vw, 72px);
}

.questions {
  position: relative;
  display: grid;
  gap: clamp(28px, 6vw, 76px);
}

.questions h2,
.chapters h2 {
  max-width: 11ch;
}

.question-list {
  display: grid;
  gap: 18px;
  max-width: 920px;
}

.question-list p {
  margin: 0;
  border-radius: var(--radius);
  background: var(--panel);
  padding: clamp(22px, 4vw, 38px);
  color: var(--text);
  font-size: clamp(1.25rem, 3vw, 2.15rem);
  line-height: 1.5;
}

.promise {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(32px, 7vw, 92px);
  align-items: center;
  background: linear-gradient(180deg, transparent, rgb(215 168 79 / 0.05), transparent);
}

.promise p {
  max-width: 58ch;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.28rem);
  line-height: 1.9;
}

.method {
  display: grid;
  gap: 12px;
}

.method span {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-strong);
  padding: 24px;
  color: var(--accent);
  font-size: clamp(1.2rem, 2.3vw, 1.8rem);
  font-weight: 750;
}

.chapters {
  display: grid;
  gap: clamp(28px, 6vw, 80px);
}

.chapters ol {
  display: grid;
  grid-template-columns: repeat(7, minmax(180px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  list-style: none;
  scrollbar-color: var(--accent) transparent;
}

.chapters li {
  min-height: 190px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 20px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
}

.chapters li::before {
  display: block;
  margin-bottom: 46px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 750;
  content: counter(list-item, decimal-leading-zero);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 30px clamp(20px, 6vw, 72px);
  color: var(--muted);
}

.site-footer p {
  margin: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .hero-copy,
  .question-list p,
  .promise,
  .chapters li {
    animation: rise 720ms cubic-bezier(0.16, 1, 0.3, 1) both;
  }

  .question-list p:nth-child(2) {
    animation-delay: 80ms;
  }

  .question-list p:nth-child(3) {
    animation-delay: 160ms;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .site-header {
    position: absolute;
    padding: 16px 20px;
  }

  nav a {
    font-size: 0.9rem;
  }

  .hero {
    align-items: end;
    padding: 104px 20px 42px;
  }

  .hero-media::after {
    background:
      linear-gradient(180deg, rgb(17 16 18 / 0.26), rgb(17 16 18 / 0.76) 48%, var(--bg)),
      linear-gradient(90deg, rgb(17 16 18 / 0.66), rgb(17 16 18 / 0.24));
  }

  .hero-media img {
    object-position: 62% center;
  }

  h1 {
    max-width: 7ch;
    font-size: clamp(2.85rem, 15vw, 4.4rem);
  }

  .signup {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }

  .promise {
    grid-template-columns: 1fr;
  }

  .chapters ol {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .chapters li {
    min-height: 128px;
  }

  .chapters li::before {
    margin-bottom: 20px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}