/* =========================================
   Walk& - Top Page Prototype
   Design: Monochrome Refined (白・黒・灰)
   Font: Serif / Mincho
   ========================================= */

/* ---------- Reset & Base (scoped to .walkand-top) ---------- */
.walkand-top,
.walkand-top *,
.walkand-top *::before,
.walkand-top *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors — 白・黒・灰の3色 */
  --black: #111111;
  --gray: #888888;
  --gray-light: #c8c8c8;
  --gray-pale: #f2f2f2;
  --white: #ffffff;
  --border: #e0e0e0;
  --border-dark: #d0d0d0;

  /* Typography */
  --font-ja: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-en: 'Cormorant Garamond', 'Times New Roman', serif;

  /* Spacing */
  --section-padding: 140px;
  --container-width: 1100px;

  /* Transitions */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-ja);
  background-color: var(--white);
  color: var(--black);
  line-height: 1.9;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* ---------- Utility ---------- */
.wk-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 32px;
}

.wk-sp-only { display: none; }
.wk-pc-only { display: inline; }

@media (max-width: 768px) {
  .wk-sp-only { display: inline; }
  .wk-pc-only { display: none; }
}

/* ---------- Buttons ---------- */
.wk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ja);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 16px 40px;
  border: 1px solid var(--black);
  background: transparent;
  color: var(--black);
  cursor: pointer;
  transition: all 0.4s var(--ease);
  white-space: nowrap;
  letter-spacing: 0.08em;
}

.wk-btn:hover {
  background: var(--black);
  color: var(--white);
}

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

.wk-btn--primary:hover {
  background: transparent;
  color: var(--black);
}

.wk-btn--outline {
  background: transparent;
  color: var(--black);
  border: 1px solid var(--gray-light);
}

.wk-btn--outline:hover {
  border-color: var(--black);
  background: var(--black);
  color: var(--white);
}

.wk-btn--lg {
  padding: 20px 56px;
  font-size: 0.9375rem;
}

/* ---------- Section Commons ---------- */
.wk-section-header {
  margin-bottom: 72px;
}

.wk-section-header--center {
  text-align: center;
}

.wk-section-label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 20px;
}

.wk-section-title {
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.04em;
}

.wk-section-desc {
  margin-top: 20px;
  font-size: 0.9375rem;
  color: var(--gray);
  max-width: 800px;
  letter-spacing: 0.02em;
}

.wk-section-header--center .wk-section-desc {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Reveal Animation ---------- */
.walkand-top [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.walkand-top [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   HEADER
   =================================== */
.wk-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 32px;
  transition: background 0.4s, box-shadow 0.4s;
}

.wk-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.wk-header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.wk-header__logo {
  z-index: 1001;
  display: flex;
  align-items: center;
}

.wk-header__logo-img {
  height: 28px;
  width: auto;
}

/* Default (white bg): show dark, hide white */
.wk-header__logo-img--dark {
  display: block;
}

.wk-header__logo-img--white {
  display: none;
}

/* On hero: show white, hide dark */
.wk-header--hero .wk-header__logo-img--dark {
  display: none;
}

.wk-header--hero .wk-header__logo-img--white {
  display: block;
}

/* Scrolled past hero: back to dark */
.wk-header--hero.is-scrolled .wk-header__logo-img--dark {
  display: block;
}

.wk-header--hero.is-scrolled .wk-header__logo-img--white {
  display: none;
}


.wk-header--hero .wk-header__nav-link {
  color: rgba(255, 255, 255, 0.6);
}

.wk-header--hero .wk-header__nav-link:hover {
  color: var(--white);
}

.wk-header--hero .wk-header__nav-link::after {
  background: var(--white);
}

.wk-header--hero .wk-header__cta {
  border-color: var(--white);
  color: var(--white);
}

.wk-header--hero .wk-header__cta:hover {
  background: var(--white);
  color: var(--black);
}

.wk-header--hero .wk-header__hamburger span {
  background: var(--white);
}


.wk-header--hero.is-scrolled .wk-header__nav-link {
  color: var(--gray);
}

.wk-header--hero.is-scrolled .wk-header__nav-link:hover {
  color: var(--black);
}

.wk-header--hero.is-scrolled .wk-header__nav-link::after {
  background: var(--black);
}

.wk-header--hero.is-scrolled .wk-header__cta {
  border-color: var(--black);
  color: var(--black);
}

.wk-header--hero.is-scrolled .wk-header__cta:hover {
  background: var(--black);
  color: var(--white);
}

.wk-header--hero.is-scrolled .wk-header__hamburger span {
  background: var(--black);
}

.wk-header__nav-list {
  display: flex;
  gap: 40px;
}

.wk-header__nav-link {
  font-family: var(--font-en);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color 0.3s;
  position: relative;
}

.wk-header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--black);
  transition: width 0.4s var(--ease);
}

.wk-header__nav-link:hover {
  color: var(--black);
}

.wk-header__nav-link:hover::after {
  width: 100%;
}

.wk-header__cta {
  font-family: var(--font-ja);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 10px 28px;
  border: 1px solid var(--black);
  color: var(--black);
  letter-spacing: 0.08em;
  transition: all 0.4s var(--ease);
}

.wk-header__cta:hover {
  background: var(--black);
  color: var(--white);
}

.wk-header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.wk-header__hamburger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--black);
  transition: all 0.3s var(--ease);
}

.wk-header__hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.wk-header__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}

.wk-header__hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.wk-mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}

.wk-mobile-nav.is-open {
  opacity: 1;
  pointer-events: all;
}

.wk-mobile-nav__list {
  text-align: center;
}

.wk-mobile-nav__link {
  display: block;
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 16px;
  color: var(--gray);
  transition: color 0.3s;
}

.wk-mobile-nav__link:hover {
  color: var(--black);
}

.wk-mobile-nav__link--cta {
  margin-top: 32px;
  display: inline-block;
  padding: 14px 40px;
  border: 1px solid var(--black);
  color: var(--black);
  font-family: var(--font-ja);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: none;
}

/* ===================================
   HERO — Full-bleed background image
   =================================== */
.wk-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.wk-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.wk-hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.wk-hero__bg-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.52);
}

.wk-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  width: 100%;
  padding: 0 32px;
  text-align: center;
}

.wk-hero__label {
  font-family: var(--font-en);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 28px;
}

.wk-hero__title {
  font-size: 3.5rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.06em;
  color: var(--white);
}

.wk-hero__title-accent {
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  padding-bottom: 2px;
}

.wk-hero__subtitle {
  margin-top: 32px;
  font-size: 1rem;
  line-height: 2.1;
  color: rgba(255, 255, 255, 0.65);
  letter-spacing: 0.04em;
}

.wk-hero__actions {
  margin-top: 52px;
}

/* Hero CTA — white outline on dark photo */
.wk-btn--hero {
  font-family: var(--font-ja);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 18px 52px;
  border: 1px solid var(--white);
  background: transparent;
  color: var(--white);
  letter-spacing: 0.1em;
  transition: all 0.4s var(--ease);
}

.wk-btn--hero:hover {
  background: var(--white);
  color: var(--black);
}

/* Scroll indicator */
.wk-hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.wk-hero__scroll span {
  font-family: var(--font-en);
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
}

.wk-hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.4), transparent);
  animation: scrollLine 2.5s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

/* ===================================
   ABOUT (課題提起)
   =================================== */
.wk-about {
  padding: var(--section-padding) 0;
  border-top: 1px solid var(--border);
}

.wk-about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
}

.wk-about__card {
  background: var(--white);
  padding: 48px 36px;
  transition: background 0.4s var(--ease);
  display: flex;
  flex-direction: column;
}

.wk-about__card:hover {
  background: var(--gray-pale);
}

.wk-about__card-illust {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 180px;
  margin-bottom: 32px;
}

.wk-about__card-img {
  height: 100%;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  opacity: 0.7;
}

.wk-about__card:hover .wk-about__card-img {
  opacity: 1;
}

.wk-about__card-number {
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--gray-light);
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.wk-about__card-title {
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  min-height: 3.2em;
}

.wk-about__card-text {
  font-size: 0.875rem;
  color: var(--gray);
  line-height: 1.9;
  letter-spacing: 0.02em;
  margin-top: auto;
}

.wk-about__solution {
  margin-top: 72px;
  text-align: center;
}

.wk-about__solution-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  color: var(--gray-light);
  margin-bottom: 24px;
  animation: bounce 2.5s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

.wk-about__solution-text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--gray);
  letter-spacing: 0.04em;
}

.wk-about__solution-text strong {
  color: var(--black);
}


/* ===================================
   SERVICE
   =================================== */
.wk-service {
  padding: var(--section-padding) 0;
  background: var(--gray-pale);
}

.wk-service__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
}

.wk-service__card {
  background: var(--gray-pale);
  padding: 48px 40px;
  transition: background 0.4s var(--ease);
}

.wk-service__card:hover {
  background: var(--white);
}

.wk-service__card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  color: var(--gray);
  margin-bottom: 28px;
}

.wk-service__card-title {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.wk-service__card-text {
  font-size: 0.875rem;
  color: var(--gray);
  line-height: 1.9;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.wk-service__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.wk-service__card-tags li {
  font-size: 0.6875rem;
  font-weight: 400;
  padding: 4px 14px;
  border: 1px solid var(--gray-light);
  color: var(--gray);
  letter-spacing: 0.04em;
}

/* ===================================
   WORKS
   =================================== */
.wk-works {
  padding: var(--section-padding) 0;
}

.wk-works__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.wk-works__card {
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.4s, transform 0.5s var(--ease);
}

.wk-works__card:hover {
  border-color: var(--gray);
  transform: translateY(-4px);
}

.wk-works__card-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.wk-works__card-placeholder {
  width: 100%;
  height: 100%;
  background: var(--gray-pale);
  display: flex;
  align-items: center;
  justify-content: center;
}

.wk-works__card-placeholder span {
  font-family: var(--font-en);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-light);
}

.wk-works__card-body {
  padding: 24px 28px 28px;
}

.wk-works__card-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.wk-works__tag {
  font-size: 0.625rem;
  font-weight: 400;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--gray);
  letter-spacing: 0.04em;
}

.wk-works__card-title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.wk-works__card-client {
  font-size: 0.75rem;
  color: var(--gray-light);
  letter-spacing: 0.04em;
}

/* ===================================
   PARTNERS
   =================================== */
.wk-partners {
  padding: 80px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.wk-partners__track-wrapper {
  margin-top: 48px;
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.wk-partners__track {
  display: flex;
  gap: 48px;
  animation: marquee 35s linear infinite;
  width: max-content;
}

.wk-partners__logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 160px;
  height: 56px;
  font-family: var(--font-en);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--gray-light);
  letter-spacing: 0.08em;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===================================
   MEDIA (ブログ)
   =================================== */
.wk-media {
  padding: var(--section-padding) 0;
  background: var(--gray-pale);
}

.wk-media__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.wk-media__card {
  background: var(--white);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.4s, transform 0.5s var(--ease);
}

.wk-media__card:hover {
  border-color: var(--gray);
  transform: translateY(-4px);
}

.wk-media__card-image {
  aspect-ratio: 16 / 10;
}

.wk-media__card-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--gray-pale), var(--border));
}

.wk-media__card-body {
  padding: 24px 24px 28px;
}

.wk-media__card-date {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  color: var(--gray-light);
  letter-spacing: 0.08em;
}

.wk-media__card-title {
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.7;
  margin-top: 10px;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.wk-media__card-category {
  font-size: 0.625rem;
  font-weight: 400;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--gray);
  letter-spacing: 0.04em;
}

.wk-media__more {
  margin-top: 56px;
  text-align: center;
}

/* ===================================
   CTA
   =================================== */
.wk-cta {
  padding: var(--section-padding) 0;
}

.wk-cta__inner {
  text-align: center;
  padding: 96px 40px;
  border: 1px solid var(--border);
  position: relative;
}

.wk-cta__title {
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.wk-cta__text {
  margin-top: 24px;
  font-size: 0.9375rem;
  color: var(--gray);
  line-height: 2;
  letter-spacing: 0.02em;
}

.wk-cta__actions {
  margin-top: 44px;
}

.wk-cta__note {
  margin-top: 20px;
  font-size: 0.75rem;
  color: var(--gray-light);
  letter-spacing: 0.04em;
}

/* ===================================
   FOOTER
   =================================== */
.wk-footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--border);
}

.wk-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 60px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border);
}

.wk-footer__logo-img {
  height: 32px;
  width: auto;
}

.wk-footer__company {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--gray);
  letter-spacing: 0.04em;
}

.wk-footer__address {
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--gray-light);
  letter-spacing: 0.02em;
}

.wk-footer__links {
  display: flex;
  gap: 72px;
}

.wk-footer__links-title {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-light);
  margin-bottom: 20px;
}

.wk-footer__links-group ul li {
  margin-bottom: 10px;
}

.wk-footer__links-group ul li a {
  font-size: 0.8125rem;
  color: var(--gray);
  letter-spacing: 0.04em;
  transition: color 0.3s;
}

.wk-footer__links-group ul li a:hover {
  color: var(--black);
}

.wk-footer__bottom {
  padding-top: 28px;
  text-align: center;
}

.wk-footer__bottom p {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  color: var(--gray-light);
  letter-spacing: 0.08em;
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 1024px) {
  :root {
    --section-padding: 100px;
  }

  .wk-hero__title {
    font-size: 2.75rem;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px;
  }

  .wk-container {
    padding: 0 20px;
  }

  .wk-header {
    padding: 0 20px;
  }

  .wk-header__nav {
    display: none;
  }

  .wk-header__cta {
    display: none;
  }

  .wk-header__hamburger {
    display: flex;
  }

  .wk-hero__inner {
    padding: 0 20px;
  }

  .wk-hero__title {
    font-size: 2.25rem;
  }

  .wk-hero__subtitle {
    font-size: 0.875rem;
  }

  .wk-section-title {
    font-size: 1.5rem;
  }

  .wk-section-header {
    margin-bottom: 48px;
  }

  .wk-about__grid {
    grid-template-columns: 1fr;
  }

  .wk-about__card {
    padding: 36px 24px;
  }

  .wk-service__grid {
    grid-template-columns: 1fr;
  }

  .wk-service__card {
    padding: 36px 24px;
  }

  .wk-works__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .wk-media__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .wk-cta__inner {
    padding: 60px 20px;
  }

  .wk-cta__title {
    font-size: 1.375rem;
  }

  .wk-footer__inner {
    flex-direction: column;
    gap: 40px;
  }

  .wk-footer__links {
    gap: 40px;
  }
}

@media (max-width: 480px) {
  .wk-hero__title {
    font-size: 1.75rem;
  }

  .wk-btn--lg {
    padding: 16px 36px;
    font-size: 0.875rem;
  }

  .wk-btn--hero {
    padding: 16px 36px;
  }
}