/* Greyhound Innovation — brand site */

:root {
  --ink: #f3f4f5;
  --ink-soft: #a7adb3;
  --mid: #7a8087;
  --line: rgba(243, 244, 245, 0.12);
  --paper: #0f1215;
  --paper-deep: #080a0c;
  --surface: #171b1f;
  --white: #ffffff;
  --black: #0a0c0e;
  --header-h: 4.5rem;

  --font-display: "IBM Plex Sans TC", "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans TC", sans-serif;
  --font-latin: "Space Grotesk", "IBM Plex Sans TC", sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --space: clamp(1.25rem, 4vw, 2.5rem);
  --max: 68rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ink);
  text-rendering: optimizeLegibility;
  background:
    radial-gradient(110% 70% at 85% 0%, rgba(90, 100, 110, 0.18) 0%, transparent 55%),
    radial-gradient(80% 50% at 10% 35%, rgba(55, 65, 75, 0.22) 0%, transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--white);
  color: var(--black);
  text-decoration: none;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 1rem;
}

/* ——— Header ——— */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease), backdrop-filter 0.35s;
}

.site-header.is-scrolled {
  background: rgba(15, 18, 21, 0.86);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.header-inner {
  max-width: calc(var(--max) + 4rem);
  margin: 0 auto;
  padding: 0 var(--space);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  width: auto;
  height: 2.75rem;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.25s var(--ease);
}

.site-nav a:hover {
  color: var(--ink);
}

.nav-cta {
  padding: 0.45rem 1rem;
  border: 1px solid rgba(243, 244, 245, 0.55);
  color: var(--ink) !important;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease) !important;
}

.nav-cta:hover {
  background: var(--white);
  border-color: var(--white);
  color: var(--black) !important;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 0.4rem;
}

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

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(0.28rem) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-0.28rem) rotate(-45deg);
}

/* ——— Buttons ——— */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: #d8dcdf;
  border-color: #d8dcdf;
  color: var(--black);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: rgba(243, 244, 245, 0.35);
}

.btn-ghost:hover {
  border-color: var(--white);
  color: var(--white);
}

/* ——— Hero ——— */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-h) + 2rem) var(--space) 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grain {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image:
    linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.06) 50%, transparent 60%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 18px,
      rgba(255, 255, 255, 0.018) 18px,
      rgba(255, 255, 255, 0.018) 19px
    );
  background-size: 200% 100%, auto;
  animation: sheen 9s ease-in-out infinite;
}

@keyframes sheen {
  0%, 100% { background-position: 100% 0, 0 0; }
  50% { background-position: 0% 0, 0 0; }
}

.speed-lines {
  position: absolute;
  right: 8%;
  top: 42%;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  width: min(28vw, 14rem);
  opacity: 0.28;
}

.speed-lines span {
  display: block;
  height: 2px;
  background: var(--ink);
  transform-origin: right center;
  animation: dash 2.8s var(--ease) infinite;
}

.speed-lines span:nth-child(1) { width: 100%; animation-delay: 0s; }
.speed-lines span:nth-child(2) { width: 72%; margin-left: auto; animation-delay: 0.2s; }
.speed-lines span:nth-child(3) { width: 44%; margin-left: auto; animation-delay: 0.4s; }

@keyframes dash {
  0%, 100% { transform: scaleX(1); opacity: 0.5; }
  50% { transform: scaleX(0.7); opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 40rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-logo {
  width: min(88vw, 22rem);
  height: auto;
  margin-bottom: 1.75rem;
  opacity: 0;
  animation: rise 1s var(--ease) 0.15s forwards;
}

.hero-title {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.65rem, 4.4vw, 2.55rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--ink);
  opacity: 0;
  animation: rise 1s var(--ease) 0.35s forwards;
}

.hero-lead {
  margin: 0 0 2rem;
  max-width: 32rem;
  font-size: clamp(1.02rem, 2.2vw, 1.15rem);
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  opacity: 0;
  animation: rise 1s var(--ease) 0.5s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  opacity: 0;
  animation: rise 1s var(--ease) 0.65s forwards;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-hint {
  position: absolute;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1.5rem;
  height: 2.25rem;
  border: 1px solid var(--mid);
  border-radius: 999px;
  opacity: 0.55;
  text-decoration: none;
}

.scroll-hint span {
  position: absolute;
  left: 50%;
  top: 0.4rem;
  width: 3px;
  height: 3px;
  margin-left: -1.5px;
  border-radius: 50%;
  background: var(--ink);
  animation: scroll-dot 1.8s var(--ease) infinite;
}

@keyframes scroll-dot {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(1rem); opacity: 0; }
}

/* ——— Sections ——— */

.section {
  padding: clamp(4.5rem, 12vw, 7.5rem) var(--space);
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.section-label {
  margin: 0 0 0.75rem;
  font-family: var(--font-latin);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mid);
}

.section-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  letter-spacing: 0.015em;
  line-height: 1.3;
}

.section-lead {
  margin: 0 0 2.75rem;
  max-width: 38rem;
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
}

/* About */

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

.about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.about-points li {
  display: grid;
  grid-template-columns: minmax(7rem, 10rem) 1fr;
  gap: 1.25rem 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.about-points strong {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
}

.about-points span {
  color: var(--ink-soft);
  font-weight: 400;
  line-height: 1.8;
}

/* Services */

.services {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, transparent 100%);
}

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

.service-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem 1.75rem;
  padding: 2.25rem 0;
  border-top: 1px solid var(--line);
}

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

.service-index {
  font-family: var(--font-latin);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  color: var(--mid);
  line-height: 1.4;
}

.service-body h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}

.service-body p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
  font-weight: 400;
  line-height: 1.8;
  max-width: 40rem;
}

.service-body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.service-body li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.95rem;
  color: var(--ink);
}

.service-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 0.45rem;
  height: 1px;
  background: var(--ink);
}

/* Careers */

.careers .section-lead {
  margin-bottom: 2rem;
}

.career-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.career-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 1rem 1.5rem;
  padding: 1.5rem 0.25rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background 0.3s var(--ease), padding 0.3s var(--ease);
}

.career-row:hover {
  background: rgba(255, 255, 255, 0.04);
  padding-left: 0.75rem;
  padding-right: 0.75rem;
  color: inherit;
}

.career-row h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
}

.career-row p {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--ink-soft);
}

.career-meta {
  font-family: var(--font-latin);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mid);
  white-space: nowrap;
}

.career-arrow {
  font-size: 1.25rem;
  color: var(--ink);
  transition: transform 0.3s var(--ease);
}

.career-row:hover .career-arrow {
  transform: translateX(0.35rem);
}

.careers-note {
  margin: 2rem 0 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-weight: 400;
  line-height: 1.75;
}

.careers-note a {
  color: var(--ink);
  font-weight: 500;
}

/* Contact */

.contact {
  border-top: 1px solid var(--line);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
}

.contact-form {
  display: grid;
  gap: 1.1rem;
}

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

.contact-form label span {
  font-family: var(--font-latin);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font: inherit;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(243, 244, 245, 0.16);
  border-radius: 0;
  outline: none;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(243, 244, 245, 0.55);
  background: rgba(255, 255, 255, 0.07);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--mid);
}

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

.contact-form .btn {
  justify-self: start;
  margin-top: 0.25rem;
}

.form-hint {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--mid);
}

.form-hint a {
  color: var(--ink-soft);
}

/* ——— Footer ——— */

.site-footer {
  background: var(--black);
  color: rgba(255, 255, 255, 0.72);
  padding: 3.5rem var(--space) 2.5rem;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
}

.footer-logo {
  width: min(70vw, 14rem);
  height: auto;
}

.footer-tagline {
  margin: 0;
  font-family: var(--font-latin);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 0.5rem;
}

.footer-links a {
  text-decoration: none;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.25s;
}

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

.footer-copy {
  margin: 1.25rem 0 0;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ——— Reveal ——— */

.reveal {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

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

/* ——— Responsive ——— */

@media (max-width: 820px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--space) 1.25rem;
    background: rgba(15, 18, 21, 0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
  }

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

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

  .nav-cta {
    margin-top: 0.5rem;
    text-align: center;
    border: 1px solid rgba(243, 244, 245, 0.55);
  }

  .about-points li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

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

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

  .career-meta {
    grid-column: 1;
    white-space: normal;
  }

  .career-arrow {
    grid-row: 1 / span 2;
    grid-column: 2;
  }

  .speed-lines {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-logo,
  .hero-title,
  .hero-lead,
  .hero-actions,
  .hero-grain,
  .speed-lines span,
  .scroll-hint span {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}