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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% 0%, #b8ebe3 0%, transparent 55%),
    radial-gradient(ellipse 70% 45% at 90% 10%, #ffe3a8 0%, transparent 50%),
    linear-gradient(165deg, #e8f4f1 0%, var(--sand) 48%, #eef6f4 100%);
  line-height: 1.5;
}

body.reader-body {
  background: linear-gradient(180deg, #b8f0ff 0%, #dff9f2 42%, #fff6d8 100%);
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--sea-deep);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
  min-height: var(--touch);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

h1, h2, h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}

p {
  margin: 0;
}

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

.shell {
  width: var(--content);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}

.brand-mark {
  font-family: var(--brand-font);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--brand-ll);
  text-decoration: none;
  letter-spacing: -0.03em;
  line-height: 1;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.brand-mark span,
.brand-spark {
  color: var(--brand-spark);
}

/* Shared LLSpark wordmark (login, reader hero, landing kicker, etc.) */
.brand-wordmark,
.auth-logo,
.auth-brand {
  font-family: var(--brand-font);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--brand-ll);
}

.brand-wordmark span,
.auth-logo-spark,
.auth-brand span {
  color: var(--brand-spark);
}

.auth-logo-ll,
.brand-ll {
  color: var(--brand-ll);
}

.wc-brand {
  font-family: var(--brand-font);
  font-weight: 700;
  color: var(--brand-ll);
  text-decoration: none;
}

.wc-brand span {
  color: var(--brand-spark);
}

/* LLSpark on dark / teal hero backgrounds */
.brand-wordmark--on-dark,
.brand-mark.brand-wordmark--on-dark {
  color: #fff;
}

.brand-wordmark--on-dark span,
.brand-mark.brand-wordmark--on-dark span {
  color: var(--brand-spark);
}

.brand-wordmark--on-dark .brand-ll,
.brand-wordmark--on-dark .auth-logo-ll {
  color: #fff;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  font-weight: 700;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--sea-deep);
  background: rgba(255, 255, 255, 0.55);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: var(--touch);
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 1.5px solid transparent;
  font-weight: 800;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: none;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--sea-deep);
  border-color: var(--sea-deep);
}

.btn-secondary {
  background: #fff;
  color: var(--sea-deep);
  border-color: var(--line);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: transparent;
}

.btn-sun {
  background: var(--sun);
  color: var(--ink);
  border-color: var(--sun);
}

.pill {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 800;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--mint);
  color: var(--sea-deep);
  white-space: nowrap;
}

.pill.warn {
  background: #ffe8c2;
  color: #8a5a00;
}

.chip {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  color: var(--muted);
}

.chip.warn {
  background: #fff4df;
  border-color: #f0c56a;
  color: #8a5a00;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(120%);
  z-index: 50;
  min-width: min(280px, calc(100vw - 2rem));
  padding: 0.85rem 1.1rem;
  border-radius: 16px;
  font-weight: 800;
  text-align: center;
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.22s ease, opacity 0.22s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Dock below main panel — same blank band as 五步跟读 wc-toast-dock */
.toast.toast-dock {
  position: relative;
  left: auto;
  bottom: auto;
  z-index: 2;
  margin: 0.85rem auto 0.35rem;
  min-width: 0;
  width: fit-content;
  max-width: min(92vw, 24rem);
  transform: translateY(0.35rem);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toast.toast-dock.show {
  transform: translateY(0);
}

.toast.good {
  background: var(--sea-deep);
}

.toast.wrong {
  background: var(--coral);
}

.toast .x {
  margin-right: 0.4rem;
}

.site-banner,
.demo-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0.55rem var(--space-3);
  background: rgba(26, 46, 53, 0.92);
  color: #d7e6ea;
  font-size: var(--text-xs);
  font-weight: 700;
}

.site-banner a,
.demo-banner a {
  color: #ffe3a8;
}

@media (max-width: 639px) {
  .site-banner,
  .demo-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header {
    flex-wrap: wrap;
  }

  .nav-links {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}