/* —— INYU / 英渝哲文 —— Brand tokens —— */
:root {
  --ink: #0f2a44;
  --ink-soft: #1a3d5c;
  --fog: #f7f9fc;
  --fog-deep: #e8edf2;
  --paper: #f7f9fc;
  --line: rgba(15, 42, 68, 0.12);
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --muted: #5c6b7a;
  --white: #ffffff;
  --font-display: "Nunito", "Noto Sans SC", sans-serif;
  --font-body: "Outfit", "Noto Sans SC", sans-serif;
  --space: clamp(1.25rem, 3vw, 2.5rem);
  --max: 1120px;
  --nav-h: 4.5rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 10px;
}

html[lang="en"] {
  --font-display: "Nunito", sans-serif;
  --font-body: "Outfit", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

/* —— Atmosphere —— */
.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(37, 99, 235, 0.08), transparent 50%),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(15, 42, 68, 0.06), transparent 45%),
    linear-gradient(180deg, var(--fog) 0%, var(--paper) 40%, var(--fog-deep) 100%);
  pointer-events: none;
}

.page-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(14, 26, 40, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 26, 40, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
}

/* —— Layout —— */
.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.section {
  padding-block: clamp(4rem, 10vw, 7rem);
}

.section-head {
  max-width: 36rem;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  letter-spacing: 0.01em;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  color: var(--ink);
}

.section-head p {
  color: var(--muted);
  font-size: 1.05rem;
}

/* —— Nav —— */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.35s var(--ease), backdrop-filter 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}

.site-header.is-over-hero:not(.is-scrolled) {
  color: var(--white);
}

.site-header.is-over-hero:not(.is-scrolled) .nav-toggle span {
  background: var(--white);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.brand {
  display: flex;
  align-items: center;
  position: relative;
  line-height: 0;
}

.brand-logo {
  height: 2.85rem;
  width: auto;
  display: block;
}

.brand-logo-white {
  display: none;
}

.site-header.is-over-hero:not(.is-scrolled) .brand-logo-color {
  display: none;
}

.site-header.is-over-hero:not(.is-scrolled) .brand-logo-white {
  display: block;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.06em;
}

.brand-sub {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.7;
  font-weight: 500;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 560;
  letter-spacing: 0.04em;
  opacity: 0.9;
}

.lang-switch a {
  opacity: 0.55;
  transition: opacity 0.2s;
}

.lang-switch a:hover,
.lang-switch a[aria-current="true"] {
  opacity: 1;
}

.lang-switch .sep {
  opacity: 0.35;
  pointer-events: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  opacity: 1;
}

.nav-links a[aria-current="page"] {
  color: var(--accent);
}

.site-header.is-over-hero:not(.is-scrolled) .nav-links a[aria-current="page"] {
  color: var(--white);
  text-decoration: underline;
  text-underline-offset: 0.35em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 560;
  letter-spacing: 0.02em;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}

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

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

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: inherit;
  border: 1px solid currentColor;
  opacity: 0.9;
}

.btn-ghost:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.1);
}

.site-header .btn-primary {
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 1.35rem;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  color: var(--white);
  overflow: hidden;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  transform: scale(1.06);
  animation: hero-drift 28s var(--ease) infinite alternate;
}

@keyframes hero-drift {
  from {
    transform: scale(1.06) translate(0, 0);
  }
  to {
    transform: scale(1.12) translate(-1.5%, -1%);
  }
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(15, 42, 68, 0.88) 0%, rgba(15, 42, 68, 0.58) 45%, rgba(15, 42, 68, 0.38) 100%),
    linear-gradient(0deg, rgba(15, 42, 68, 0.7) 0%, transparent 45%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  padding-bottom: clamp(4.5rem, 12vw, 7rem);
  padding-top: calc(var(--nav-h) + 2rem);
}

.hero-brand {
  margin-bottom: 1.35rem;
  opacity: 0;
  transform: translateY(1.25rem);
  animation: rise 0.9s var(--ease) 0.15s forwards;
}

.hero-logo {
  height: clamp(4.25rem, 10vw, 6.25rem);
  width: auto;
  display: block;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.45;
  max-width: 22em;
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(1.25rem);
  animation: rise 0.9s var(--ease) 0.35s forwards;
}

.hero-lead {
  max-width: 32rem;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  opacity: 0;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 2rem;
  transform: translateY(1.25rem);
  animation: rise 0.9s var(--ease) 0.5s forwards;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  opacity: 0;
  transform: translateY(1.25rem);
  animation: rise 0.9s var(--ease) 0.65s forwards;
}

.hero .btn-primary {
  background: var(--accent);
  color: var(--white);
}

.hero .btn-primary:hover {
  background: var(--accent-hover);
}

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

/* —— Page hero (inner) —— */
.page-hero {
  padding-top: calc(var(--nav-h) + clamp(3rem, 8vw, 5rem));
  padding-bottom: clamp(2.5rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.07), transparent 55%),
    var(--fog);
}

.page-hero .wrap {
  max-width: 40rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 0.85rem;
}

.page-hero p {
  color: var(--muted);
  font-size: 1.1rem;
}

/* —— Business pillars —— */
.pillars {
  display: grid;
  gap: 0;
}

.pillar {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem 2rem;
  padding-block: 2.25rem;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.pillar.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.pillar:last-child {
  border-bottom: 1px solid var(--line);
}

.pillar-index {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  padding-top: 0.35rem;
}

.pillar h3 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 0.65rem;
  letter-spacing: 0.02em;
}

.pillar p {
  color: var(--muted);
  max-width: 40rem;
}

/* —— About teaser —— */
.about-teaser {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 4.5rem);
  align-items: center;
}

.about-teaser-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  min-height: 280px;
}

.about-teaser-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-teaser-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(14, 26, 40, 0.25));
}

.about-teaser-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.about-teaser-copy p {
  color: var(--muted);
  margin-bottom: 1.75rem;
}

/* —— CTA band —— */
.cta-band {
  background: var(--ink);
  color: var(--white);
  padding-block: clamp(3.5rem, 8vw, 5rem);
}

.cta-band .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.7);
  max-width: 28rem;
}

.cta-band .btn-primary {
  background: var(--accent);
}

.cta-band .btn-primary:hover {
  background: var(--accent-hover);
}

/* —— About page —— */
.prose {
  max-width: 42rem;
}

.prose p + p {
  margin-top: 1.15rem;
}

.prose p {
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.fact-list {
  margin-top: 3rem;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.fact-row {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 1rem;
  padding-block: 1.15rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}

.fact-row dt {
  color: var(--muted);
  font-weight: 500;
}

.capability-list {
  display: grid;
  gap: 2.5rem;
  margin-top: 1rem;
}

.capability h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
  letter-spacing: 0.02em;
}

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

/* —— Services —— */
.service-block {
  padding-block: clamp(2.5rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line);
}

.service-block:last-of-type {
  border-bottom: 1px solid var(--line);
}

.service-block h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 1.75rem);
  font-weight: 600;
  margin-bottom: 1.25rem;
  letter-spacing: 0.02em;
}

.service-points {
  display: grid;
  gap: 0.65rem;
}

.service-points li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

.service-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.4rem;
  height: 1px;
  background: var(--accent);
}

.legal-note {
  margin-top: 3rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
  color: var(--muted);
  max-width: 42rem;
}

/* —— Contact —— */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(2.5rem, 6vw, 4rem);
  align-items: start;
}

.contact-info h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

.contact-info dl {
  display: grid;
  gap: 1.25rem;
}

.contact-info dt {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.contact-info dd {
  font-size: 1rem;
  color: var(--ink-soft);
}

.contact-form {
  background: var(--white);
  border: 1px solid var(--line);
  padding: clamp(1.5rem, 3vw, 2.25rem);
}

.contact-form h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
}

.contact-form > p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.form-field {
  margin-bottom: 1.15rem;
}

.form-field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-field textarea {
  min-height: 7rem;
  resize: vertical;
}

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

.form-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--accent);
  display: none;
}

.form-status.is-shown {
  display: block;
}

/* —— Footer —— */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.75);
  padding-block: 3rem 2rem;
  font-size: 0.875rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 1.5rem;
}

.footer-logo {
  height: 3rem;
  width: auto;
  margin-bottom: 1.15rem;
  display: block;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--white);
  letter-spacing: 0.06em;
  margin-bottom: 0.65rem;
}

.footer-brand span {
  display: block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-top: 0.25rem;
}

.footer-col h3 {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 0.85rem;
  font-weight: 500;
}

.footer-col a {
  display: block;
  margin-bottom: 0.45rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  opacity: 0.55;
  font-size: 0.8rem;
}

/* —— Reveal —— */
.reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* —— Responsive —— */
@media (max-width: 860px) {
  .about-teaser,
  .contact-grid,
  .footer-top {
    grid-template-columns: 1fr;
  }

  .about-teaser-visual {
    aspect-ratio: 16 / 10;
    max-height: 280px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem 1.25rem 1.5rem;
    background: rgba(247, 249, 252, 0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    color: var(--ink);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease), visibility 0.35s;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-links .btn-primary {
    margin-top: 0.75rem;
    width: 100%;
  }

  .site-header.is-over-hero:not(.is-scrolled) .nav-links {
    color: var(--ink);
  }

  .fact-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}

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

  .hero-media img {
    transform: none;
    animation: none;
  }
}