/* ==========================================================================
   V-QUEST Custom Styles
   Aesthetic: Refined minimalism with Japanese sensibility
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Ink-inspired palette */
  --color-ink: #0a0a0a;
  --color-ink-light: #1a1a1a;
  --color-ink-soft: #2d2d2d;
  --color-stone: #4a4a4a;
  --color-ash: #888888;
  --color-mist: #c8c8c8;
  --color-paper: #fafafa;
  --color-white: #ffffff;

  /* Accent */
  --color-accent: #c9a868;
  --color-accent-soft: rgba(201, 168, 104, 0.15);

  /* Typography */
  --font-display: 'Shippori Mincho', serif;
  --font-body: 'Noto Sans JP', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;

  /* Container */
  --container-max: 1100px;
  --container-padding: 1.5rem;

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.8s;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 2;
  letter-spacing: 0.03em;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 768px) {
  body {
    font-size: 18px;
  }
}

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

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

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.4;
}

p {
  margin-bottom: 1em;
}

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

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-xl) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-2xl) 0;
  }
}

/* --------------------------------------------------------------------------
   Site Header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.875rem 0;
  transition:
    background-color var(--duration-normal) var(--ease-out-expo),
    box-shadow var(--duration-normal) var(--ease-out-expo);
}

.site-header.is-scrolled {
  background-color: rgba(250, 250, 250, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.site-header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  -webkit-tap-highlight-color: transparent;
}

.site-logo img {
  width: 88px;
  transition: opacity var(--duration-fast) ease;
}

.site-logo:hover img {
  opacity: 0.7;
}

/* Desktop Navigation */
.site-nav {
  display: none;
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }
}

.site-nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.site-nav-list a {
  display: block;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-ink);
  padding: var(--space-xs) var(--space-sm);
  transition: color var(--duration-fast) ease;
}

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

/* Menu Button (Mobile) */
.menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 6px;
  z-index: 200;
  -webkit-tap-highlight-color: transparent;
}

.menu-btn span {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-ink);
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.menu-btn.is-open span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.menu-btn.is-open span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

@media (min-width: 768px) {
  .menu-btn {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Mobile Menu Overlay
   -------------------------------------------------------------------------- */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 150;
  background-color: var(--color-paper);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out-expo),
    visibility var(--duration-normal) var(--ease-out-expo);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-close {
  position: absolute;
  top: 0.875rem;
  right: var(--container-padding);
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
}

.mobile-menu-close span {
  position: absolute;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-ink);
}

.mobile-menu-close span:first-child {
  transform: rotate(45deg);
}

.mobile-menu-close span:last-child {
  transform: rotate(-45deg);
}

.mobile-menu-nav ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.mobile-menu-nav a {
  display: block;
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-ink);
  padding: 0.75rem 1.5rem;
  opacity: 0;
  transform: translateY(20px);
  position: relative;
  -webkit-tap-highlight-color: transparent;
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo),
    color var(--duration-fast) ease,
    background-color var(--duration-fast) ease;
}

.mobile-menu-nav a::after {
  content: '';
  position: absolute;
  bottom: 0.5rem;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--color-ink);
  transform: translateX(-50%);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

.mobile-menu-nav a:hover::after,
.mobile-menu-nav a:active::after {
  width: 60%;
}

.mobile-menu.is-open .mobile-menu-nav a {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu.is-open .mobile-menu-nav li:nth-child(1) a { transition-delay: 0.05s; }
.mobile-menu.is-open .mobile-menu-nav li:nth-child(2) a { transition-delay: 0.1s; }
.mobile-menu.is-open .mobile-menu-nav li:nth-child(3) a { transition-delay: 0.15s; }
.mobile-menu.is-open .mobile-menu-nav li:nth-child(4) a { transition-delay: 0.2s; }
.mobile-menu.is-open .mobile-menu-nav li:nth-child(5) a { transition-delay: 0.25s; }

@media (min-width: 768px) {
  .mobile-menu {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: var(--space-2xl) var(--container-padding);
  background: linear-gradient(
    180deg,
    var(--color-paper) 0%,
    rgba(245, 245, 245, 1) 100%
  );
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(201, 168, 104, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(201, 168, 104, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  animation: fadeInUp 1s var(--ease-out-expo) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-logo {
  margin-bottom: var(--space-lg);
}

.hero-logo img {
  width: 180px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .hero-logo img {
    width: 240px;
  }
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 2;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}

.tagline-line {
  display: block;
}

@media (min-width: 768px) {
  .hero-tagline {
    font-size: 1.9rem;
  }

  .tagline-line {
    display: inline;
  }
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  padding: 1.1rem 2.2rem;
  border: 1px solid var(--color-ink);
  border-radius: 50px;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.hero-cta svg {
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.hero-cta:hover {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.hero-cta:hover svg {
  transform: translateY(4px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(
    180deg,
    var(--color-ink) 0%,
    transparent 100%
  );
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% {
    opacity: 0.3;
    transform: scaleY(0.8);
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* --------------------------------------------------------------------------
   Vision Section
   -------------------------------------------------------------------------- */
.section-vision {
  background-color: var(--color-white);
}

.vision-item {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  text-align: center;
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

.vision-item:last-child {
  border-bottom: none;
}

@media (min-width: 768px) {
  .vision-item {
    padding: var(--space-xl) 0;
  }
}

.vision-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  color: var(--color-mist);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

@media (min-width: 768px) {
  .vision-number {
    font-size: 2.5rem;
  }
}

.vision-content {
  max-width: 100%;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 1.9rem;
  }
}

.section-subtitle {
  display: block;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0.15em;
  color: var(--color-ash);
  margin-top: var(--space-xs);
}

.vision-content p {
  color: var(--color-stone);
  font-size: 1rem;
  line-height: 2.1;
}

/* --------------------------------------------------------------------------
   Company Section
   -------------------------------------------------------------------------- */
.section-company {
  background-color: var(--color-paper);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

.section-title-main {
  font-size: 1.6rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

@media (min-width: 768px) {
  .section-title-main {
    font-size: 1.9rem;
  }
}

.section-title-en {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--color-ash);
}

.company-info {
  max-width: 560px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  transition-delay: 0.2s;
}

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

.info-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xs);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

@media (min-width: 600px) {
  .info-row {
    grid-template-columns: 140px 1fr;
    gap: var(--space-md);
  }
}

.info-row:last-child {
  border-bottom: none;
}

.info-row dt {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-ink);
}

.info-row dt small {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--color-ash);
}

.info-row dd {
  color: var(--color-ink-soft);
  font-size: 1rem;
  line-height: 1.9;
}

.info-row dd ul {
  list-style: none;
}

.info-row dd li {
  position: relative;
  padding-left: 1em;
}

.info-row dd li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 4px;
  height: 1px;
  background-color: var(--color-ash);
}

/* --------------------------------------------------------------------------
   Engineer Section
   -------------------------------------------------------------------------- */
.section-engineer {
  background-color: var(--color-ink);
  color: var(--color-white);
}

.section-engineer .section-title-en {
  color: var(--color-ash);
}

.engineer-profile {
  max-width: 700px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  transition-delay: 0.2s;
}

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

.profile-main {
  text-align: center;
  padding-bottom: var(--space-lg);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.profile-name {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.profile-role {
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--color-ash);
}

.profile-section {
  margin-bottom: var(--space-lg);
}

.profile-section:last-child {
  margin-bottom: 0;
}

.profile-section h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.profile-section p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  line-height: 2.1;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tags span {
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  color: rgba(255, 255, 255, 0.8);
  transition:
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.tech-tags span:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.9);
}

.cert-list li {
  position: relative;
  padding-left: 1.25em;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 0.6rem;
  line-height: 1.8;
}

.cert-list li:last-child {
  margin-bottom: 0;
}

.cert-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

/* --------------------------------------------------------------------------
   Works Section
   -------------------------------------------------------------------------- */
.section-works {
  background-color: var(--color-paper);
}

.works-list {
  max-width: 700px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  transition-delay: 0.2s;
}

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

.work-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.work-item:last-child {
  border-bottom: none;
}

.work-item a {
  display: flex;
  align-items: center;
  padding: var(--space-md) 0;
  gap: var(--space-sm);
  transition: opacity var(--duration-fast) ease;
}

.work-item a:hover {
  opacity: 0.6;
}

.work-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  flex: 1;
}

.work-location {
  font-size: 0.9rem;
  color: var(--color-ash);
  display: none;
}

@media (min-width: 600px) {
  .work-location {
    display: block;
  }
}

.work-arrow {
  color: var(--color-ash);
  flex-shrink: 0;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.work-item a:hover .work-arrow {
  transform: translate(4px, -4px);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.section-contact {
  background-color: var(--color-white);
}

.contact-inner {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background: linear-gradient(
    135deg,
    rgba(201, 168, 104, 0.04) 0%,
    rgba(201, 168, 104, 0.08) 100%
  );
  border-radius: 8px;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

.contact-title {
  font-size: 1.6rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.contact-text {
  font-size: 1rem;
  color: var(--color-stone);
  margin-bottom: var(--space-md);
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-white);
  background-color: var(--color-ink);
  padding: 1rem 2rem;
  border-radius: 50px;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color var(--duration-fast) ease,
    transform var(--duration-fast) ease;
}

@media (min-width: 768px) {
  .contact-btn {
    font-size: 0.95rem;
    padding: 1.1rem 2.5rem;
  }
}

.contact-btn:hover {
  background-color: var(--color-ink-light);
  transform: translateY(-2px);
}

.contact-btn svg {
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.contact-btn:hover svg {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-ink);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer-copy {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--color-ash);
}

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

/* Selection color */
::selection {
  background-color: var(--color-accent-soft);
  color: var(--color-ink);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Scrollbar styling (WebKit) */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-paper);
}

::-webkit-scrollbar-thumb {
  background: var(--color-mist);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-ash);
}