/* Huiwan Group — corporate site */

:root {
  --ink: #0e1a22;
  --ink-soft: #243441;
  --jade: #1f7a63;
  --jade-deep: #145944;
  --sand: #d8c3a5;
  --mist: #eef2f4;
  --paper: #f7f9fa;
  --line: rgba(14, 26, 34, 0.12);
  --text: #1a2a33;
  --muted: #5c6d78;
  --white: #ffffff;
  --header-h: 72px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Noto Serif TC", "Songti TC", serif;
  --font-sans: "Noto Sans TC", "Sora", "PingFang TC", sans-serif;
  --font-en: "Sora", "Noto Sans TC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.bg-grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.container.narrow {
  width: min(860px, calc(100% - 40px));
}

/* Header */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  height: var(--header-h);
  background: rgba(247, 249, 250, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(247, 249, 250, 0.94);
}

.header-inner {
  height: 100%;
  width: min(1200px, calc(100% - 32px));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 50% 8% 50% 8%;
  background:
    linear-gradient(145deg, var(--jade) 0%, var(--jade-deep) 55%, #0f3d32 100%);
  position: relative;
  transform: rotate(-12deg);
}

.logo-mark::after {
  content: "";
  position: absolute;
  inset: 9px 8px 8px 10px;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  border-radius: 40% 10% 45% 12%;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-zh {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
}

.logo-en {
  font-family: var(--font-en);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  font-weight: 500;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--jade);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 8px;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  background: var(--white);
}

.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0.35rem 0.65rem;
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.25s, background 0.25s;
}

.lang-btn.is-active {
  background: var(--ink);
  color: var(--white);
}

.header-cta {
  display: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 0;
  cursor: pointer;
  place-items: center;
  gap: 6px;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.menu-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.75px) rotate(40deg);
}

.menu-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.75px) rotate(-40deg);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.85rem 1.45rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s, border-color 0.3s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-sm {
  min-height: 38px;
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

.btn-primary {
  background: var(--jade);
  color: var(--white);
  border-color: var(--jade);
}

.btn-primary:hover {
  background: var(--jade-deep);
  border-color: var(--jade-deep);
}

.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
}

/* Hero */

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--white);
  overflow: hidden;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  transform: scale(1.04);
  animation: hero- ken 18s var(--ease) forwards;
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 16, 22, 0.35) 0%, rgba(8, 16, 22, 0.2) 35%, rgba(8, 16, 22, 0.78) 100%),
    linear-gradient(90deg, rgba(8, 18, 24, 0.55) 0%, rgba(8, 18, 24, 0.12) 55%, rgba(8, 18, 24, 0.35) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: calc(var(--header-h) + 48px) 0 72px;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 1.1rem;
  opacity: 0;
  animation: rise 0.9s var(--ease) 0.15s forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 4.2vw, 3.15rem);
  line-height: 1.25;
  letter-spacing: 0.04em;
  max-width: 14em;
  margin-bottom: 1rem;
  opacity: 0;
  animation: rise 0.9s var(--ease) 0.3s forwards;
}

.hero-lead {
  max-width: 36rem;
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 1.75rem;
  opacity: 0;
  animation: rise 0.9s var(--ease) 0.45s forwards;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  opacity: 0;
  animation: rise 0.9s var(--ease) 0.6s forwards;
}

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

@keyframes hero-ken {
  to {
    transform: scale(1);
  }
}

/* Sections */

.section {
  padding: clamp(72px, 10vw, 112px) 0;
}

.eyebrow {
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--jade);
  margin-bottom: 0.85rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 0.9rem;
}

.section-lead {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 40rem;
}

.section-head {
  margin-bottom: clamp(36px, 5vw, 56px);
}

.section-head .section-lead {
  margin-top: 0.35rem;
}

/* Reveal on scroll */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

/* About */

.about {
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(31, 122, 99, 0.08), transparent 55%),
    linear-gradient(180deg, #f2f6f7 0%, var(--paper) 100%);
}

.about .section-lead {
  margin-bottom: 2.5rem;
}

.about-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.about-block {
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.about-block h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 0.55rem;
  color: var(--ink);
}

.about-block p {
  color: var(--muted);
  max-width: 48rem;
}

/* Business */

.business {
  background:
    linear-gradient(165deg, #122028 0%, #0e1a22 45%, #16352d 100%);
  color: var(--white);
}

.business .eyebrow {
  color: var(--sand);
}

.business .section-title {
  color: var(--white);
}

.business .section-lead {
  color: rgba(255, 255, 255, 0.72);
}

.service-list {
  display: grid;
  gap: 0;
}

.service-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  padding: 1.75rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.service-item:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.service-index {
  font-family: var(--font-en);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--sand);
  letter-spacing: 0.04em;
  padding-top: 0.15rem;
}

.service-body h3 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin-bottom: 0.55rem;
}

.service-body p {
  color: rgba(255, 255, 255, 0.72);
  max-width: 46rem;
}

/* Strengths */

.strengths {
  background:
    linear-gradient(180deg, var(--mist) 0%, var(--paper) 100%);
}

.strength-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.strength-list li {
  padding: 1.75rem 1.5rem 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.strength-list li:nth-child(odd) {
  padding-right: 2rem;
  border-right: 1px solid var(--line);
}

.strength-list li:nth-child(even) {
  padding-left: 2rem;
}

.strength-list h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--ink);
}

.strength-list p {
  color: var(--muted);
}

/* Process */

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

.process-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: none;
}

.process-track li {
  position: relative;
  padding-top: 8px;
}

.process-track li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 27px;
  left: 48px;
  right: -12px;
  height: 1px;
  background: linear-gradient(90deg, var(--jade), rgba(31, 122, 99, 0.15));
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  border: 1px solid var(--jade);
  color: var(--jade-deep);
  font-family: var(--font-en);
  font-weight: 600;
  background: var(--white);
  position: relative;
  z-index: 1;
}

.process-track h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 0.45rem;
}

.process-track p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Contact */

.contact {
  background:
    radial-gradient(ellipse 70% 50% at 90% 10%, rgba(216, 195, 165, 0.22), transparent 50%),
    linear-gradient(180deg, #eef3f4 0%, #e7eeef 100%);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.contact-meta {
  margin-top: 2rem;
  display: grid;
  gap: 1.15rem;
}

.contact-meta li span {
  display: block;
  font-family: var(--font-en);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.contact-meta a,
.contact-meta p {
  color: var(--ink);
  font-weight: 500;
}

.contact-meta a:hover {
  color: var(--jade);
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 18px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.contact-form label {
  display: grid;
  gap: 0.4rem;
}

.contact-form label.full,
.contact-form .btn,
.contact-form .form-note {
  grid-column: 1 / -1;
}

.contact-form span {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-soft);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: var(--radius);
  padding: 0.75rem 0.85rem;
  outline: none;
  transition: border-color 0.25s;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--jade);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

.form-note {
  margin: 0;
  color: var(--jade-deep);
  font-size: 0.92rem;
}

/* Footer */

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
  padding: 40px 0 32px;
}

.footer-inner {
  display: grid;
  gap: 20px;
}

.footer-name {
  font-family: var(--font-display);
  color: var(--white);
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.footer-tag {
  font-family: var(--font-en);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 22px;
}

.footer-nav a:hover {
  color: var(--white);
}

.copyright {
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 18px;
}

/* Language fade */

[data-i18n] {
  transition: opacity 0.2s ease;
}

html.lang-switching [data-i18n] {
  opacity: 0.35;
}

/* Responsive */

@media (min-width: 900px) {
  .header-cta {
    display: inline-flex;
  }
}

@media (max-width: 899px) {
  .menu-toggle {
    display: grid;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    margin: 0;
    padding: 20px;
    background: rgba(247, 249, 250, 0.98);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  }

  .nav.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav a {
    padding: 0.95rem 0.2rem;
    border-bottom: 1px solid var(--line);
    font-size: 1.05rem;
  }

  .nav a::after {
    display: none;
  }

  .header-actions {
    margin-left: auto;
  }

  .service-item {
    grid-template-columns: 56px 1fr;
    gap: 12px;
  }

  .strength-list {
    grid-template-columns: 1fr;
  }

  .strength-list li,
  .strength-list li:nth-child(odd),
  .strength-list li:nth-child(even) {
    padding: 1.4rem 0;
    border-right: 0;
  }

  .process-track {
    grid-template-columns: 1fr 1fr;
    gap: 28px 20px;
  }

  .process-track li:not(:last-child)::after {
    display: none;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .hero-content {
    padding-bottom: 56px;
  }

  .contact-form {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .process-track {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .hero-cta {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-media img,
  .hero-brand,
  .hero-title,
  .hero-lead,
  .hero-cta,
  .reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}