/* ==========================================================================
   PRESALESIFY LIMITED — Corporate site styles
   Palette: Warm Ivory Editorial (not pure black)
   Paper · ink espresso · champagne gold
   ========================================================================== */

:root {
  /* Surfaces */
  --paper: #f5f1e8;
  --paper-deep: #ebe6da;
  --surface: #fffcf7;
  --surface-hover: #ffffff;

  /* Ink (warm near-black, never pure #000 on large areas) */
  --ink: #1c1915;
  --ink-soft: #3f3b34;
  --ink-muted: #5f5a52;
  --ink-faint: #8a847a;

  /* Brand gold */
  --gold: #b8943f;
  --gold-bright: #c9a962;
  --gold-deep: #8f7030;
  --gold-soft: rgba(184, 148, 63, 0.14);
  --gold-line: rgba(184, 148, 63, 0.55);

  /* Accent band (footer / contrast) — espresso, not pure black */
  --espresso: #2a2620;
  --espresso-soft: #3a342c;

  --border: rgba(28, 25, 21, 0.1);
  --border-strong: rgba(28, 25, 21, 0.16);
  --shadow-sm: 0 1px 2px rgba(28, 25, 21, 0.04);
  --shadow-md: 0 10px 30px rgba(28, 25, 21, 0.08);
  --shadow-lg: 0 18px 48px rgba(28, 25, 21, 0.1);

  --font: system-ui, -apple-system, "SF Pro Text", "SF Pro Display", Inter,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --header-h: 5.75rem;
  --logo-h: 3.6rem;
  --max: 72rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --radius: 0.75rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.28s;
}

@media (min-width: 768px) {
  :root {
    --header-h: 6.5rem;
    --logo-h: 4.35rem;
  }
}

@media (min-width: 1100px) {
  :root {
    --header-h: 6.75rem;
    --logo-h: 4.75rem;
  }
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--gold-deep);
}

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

.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;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  width: min(100% - var(--gutter) * 2, var(--max));
  margin-inline: auto;
}

.section {
  padding-block: clamp(4rem, 10vw, 7.5rem);
}

.section--tight {
  padding-block: clamp(3rem, 8vw, 5rem);
}

.section__eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.section__title {
  margin: 0 0 1.25rem;
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
}

.section__lead {
  margin: 0;
  max-width: 40rem;
  color: var(--ink-muted);
  font-size: 1.0625rem;
}

.gold-rule {
  display: block;
  width: 3rem;
  height: 2px;
  margin: 1.5rem 0;
  background: linear-gradient(90deg, var(--gold), transparent);
  border: 0;
}

/* --------------------------------------------------------------------------
   Header — frosted paper, logo sits on light
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 252, 247, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  width: min(100% - var(--gutter) * 2, var(--max));
  margin-inline: auto;
}

.logo-link {
  display: flex;
  align-items: center;
  flex: 0 1 auto;
  min-width: 0;
  max-width: min(78vw, 22rem);
  padding-block: 0.25rem;
  transition: opacity var(--duration) var(--ease);
}

.logo-link:hover {
  opacity: 0.88;
  color: inherit;
}

.logo-link:focus-visible {
  border-radius: 0.35rem;
}

/* Wordmark ~2.14:1 — transparent ink on paper */
.logo-horizontal {
  display: block;
  height: var(--logo-h);
  width: auto;
  max-width: 100%;
  max-height: calc(var(--header-h) - 1rem);
  aspect-ratio: 778 / 364;
  object-fit: contain;
  object-position: left center;
  image-rendering: auto;
  -webkit-user-drag: none;
  user-select: none;
}

@media (max-width: 380px) {
  :root {
    --header-h: 5.25rem;
    --logo-h: 3.15rem;
  }

  .logo-link {
    max-width: min(72vw, 16rem);
  }
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color var(--duration) var(--ease),
    background var(--duration) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--gold-line);
  background: var(--gold-soft);
}

.nav-toggle__bars {
  position: relative;
  width: 1.15rem;
  height: 0.85rem;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--duration) var(--ease),
    opacity var(--duration) var(--ease), top var(--duration) var(--ease);
}

.nav-toggle__bars span:nth-child(1) {
  top: 0;
}

.nav-toggle__bars span:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}

.nav-toggle__bars span:nth-child(3) {
  top: 100%;
  transform: translateY(-100%);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

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

.site-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.95rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
  border-radius: 0.4rem;
  transition: color var(--duration) var(--ease),
    background var(--duration) var(--ease);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--ink);
  background: rgba(28, 25, 21, 0.04);
}

.site-nav__link[aria-current="page"] {
  color: var(--gold-deep);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: rgba(245, 241, 232, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 1.5rem var(--gutter) 2rem;
    transform: translateY(-0.5rem);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--duration) var(--ease),
      transform var(--duration) var(--ease),
      visibility var(--duration) var(--ease);
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .site-nav__link {
    padding: 1rem 1.1rem;
    font-size: 1.05rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
  }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  padding-block: clamp(4rem, 12vw, 8rem);
  overflow: hidden;
  background:
    radial-gradient(
      ellipse 75% 60% at 90% 10%,
      rgba(201, 169, 98, 0.16),
      transparent 55%
    ),
    radial-gradient(
      ellipse 55% 45% at 5% 90%,
      rgba(184, 148, 63, 0.08),
      transparent 50%
    ),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(28, 25, 21, 0.03) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(28, 25, 21, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 20%, transparent 75%);
  pointer-events: none;
  opacity: 0.55;
}

.hero__watermark {
  position: absolute;
  right: clamp(-2%, 2vw, 4%);
  top: 50%;
  transform: translateY(-50%);
  width: min(42vw, 22rem);
  opacity: 0.08;
  pointer-events: none;
  user-select: none;
  object-fit: contain;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 44rem;
}

.hero__title {
  margin: 0;
  font-size: clamp(2rem, 5.5vw, 3.35rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--ink);
}

.hero__tagline {
  margin: 0;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--gold-deep);
}

.hero__copy {
  margin: 0;
  max-width: 36rem;
  font-size: 1.0625rem;
  color: var(--ink-muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.25rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 560;
  letter-spacing: 0.02em;
  line-height: 1;
  border-radius: 0.5rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--duration) var(--ease),
    border-color var(--duration) var(--ease), color var(--duration) var(--ease),
    transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--gold);
  color: #fffef9;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.2) inset,
    0 6px 16px rgba(143, 112, 48, 0.22);
}

.btn--primary:hover {
  background: var(--gold-deep);
  color: #fffef9;
}

.btn--ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.btn--ghost:hover {
  border-color: var(--gold-line);
  color: var(--gold-deep);
  background: var(--gold-soft);
}

/* --------------------------------------------------------------------------
   About
   -------------------------------------------------------------------------- */

.about {
  background: var(--surface);
  border-block: 1px solid var(--border);
}

.about__grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 900px) {
  .about__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 4rem;
    align-items: start;
  }
}

.about__text p {
  margin: 0 0 1.1rem;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

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

.about__text strong {
  color: var(--ink);
  font-weight: 600;
}

.about__meta {
  display: grid;
  gap: 1rem;
  margin-top: 0.5rem;
}

.about__meta-item {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-sm);
}

.about__meta-item strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.about__meta-item span {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Services
   -------------------------------------------------------------------------- */

.services {
  background: var(--paper);
}

.services__header {
  margin-bottom: clamp(2rem, 5vw, 3rem);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 560px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.15rem;
  }

  .service-card:last-child:nth-child(7) {
    grid-column: 2;
  }
}

.service-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem 1.4rem 1.55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration) var(--ease),
    border-color var(--duration) var(--ease),
    box-shadow var(--duration) var(--ease),
    background var(--duration) var(--ease);
}

.service-card:hover,
.service-card:focus-within {
  transform: scale(1.02);
  border-color: var(--gold-line);
  box-shadow: var(--shadow-md);
  background: var(--surface-hover);
}

@media (hover: none) {
  .service-card:active {
    transform: scale(0.99);
    border-color: var(--gold-line);
  }
}

.service-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  color: var(--ink-soft);
}

.service-card__icon svg {
  width: 100%;
  height: 100%;
}

.service-card__icon .accent {
  stroke: var(--gold);
  fill: none;
}

.service-card h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.service-card p {
  margin: 0;
  font-size: 0.925rem;
  color: var(--ink-muted);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   Process
   -------------------------------------------------------------------------- */

.process {
  background: var(--paper-deep);
  border-block: 1px solid var(--border);
}

.process__header {
  margin-bottom: clamp(2.25rem, 5vw, 3.25rem);
}

.process-track {
  display: grid;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.process-step {
  position: relative;
  counter-increment: step;
  padding: 1.5rem 0 1.5rem 1.25rem;
  border-left: 2px solid var(--gold-line);
}

.process-step:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.process-step__marker {
  position: absolute;
  left: -0.55rem;
  top: 1.55rem;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px var(--paper-deep);
}

.process-step__num {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.process-step__num::before {
  content: "0" counter(step);
}

.process-step h3 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.process-step p {
  margin: 0;
  max-width: 28rem;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

@media (min-width: 900px) {
  .process-track {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
  }

  .process-step {
    border-left: 0;
    padding: 0 1.25rem 0 0;
  }

  .process-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 0.45rem;
    left: 0.95rem;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--gold), var(--gold-line));
  }

  .process-step__marker {
    position: relative;
    left: 0;
    top: 0;
    margin-bottom: 1.35rem;
    box-shadow: 0 0 0 4px var(--paper-deep);
  }

  .process-step:last-child {
    padding-right: 0;
  }
}

/* --------------------------------------------------------------------------
   Privacy page
   -------------------------------------------------------------------------- */

.page-hero {
  padding-block: clamp(3rem, 8vw, 5rem) clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface) 0%, var(--paper) 100%);
}

.page-hero__zh {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--gold-deep);
}

.page-hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-hero__meta {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-faint);
}

.legal {
  padding-block: clamp(2.5rem, 6vw, 4rem) clamp(4rem, 10vw, 6rem);
  background: var(--paper);
}

.legal__content {
  max-width: 42rem;
}

.legal__content h2 {
  margin: 2.25rem 0 0.85rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.legal__content h2:first-child {
  margin-top: 0;
}

.legal__content p,
.legal__content li {
  color: var(--ink-muted);
  font-size: 0.98rem;
}

.legal__content p {
  margin: 0 0 1rem;
}

.legal__content strong {
  color: var(--ink);
  font-weight: 600;
}

.legal__content ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

.legal__content li {
  margin-bottom: 0.4rem;
}

.legal__content a {
  color: var(--gold-deep);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.legal__content a:hover {
  color: var(--gold);
}

/* --------------------------------------------------------------------------
   Footer — espresso band for grounding (not pure black)
   -------------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid rgba(255, 252, 247, 0.08);
  background: var(--espresso);
  padding-block: 2.25rem;
  color: rgba(255, 252, 247, 0.72);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 640px) {
  .site-footer__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.site-footer__brand {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 252, 247, 0.65);
}

.site-footer__brand strong {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
  color: #fffcf7;
  letter-spacing: 0.02em;
}

.site-footer__zh {
  color: rgba(255, 252, 247, 0.45);
  font-size: 0.85rem;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  font-size: 0.85rem;
  color: rgba(255, 252, 247, 0.45);
}

.site-footer__meta a {
  color: rgba(255, 252, 247, 0.72);
}

.site-footer__meta a:hover {
  color: var(--gold-bright);
}