/* ============================================================
   K2 Partnering Solutions — Site Renewal Demo
   Design: Editorial / Premium B2B / Tech Talent Platform
   ============================================================ */

:root {
  --color-bg: #ffffff;
  --color-ink: #0a0a0a;
  --color-ink-soft: #2a2a2a;
  --color-muted: #6b7280;
  --color-line: #e5e7eb;
  --color-surface: #f6f6f4;
  --color-surface-2: #efefea;
  --color-accent: #ff5a1f;        /* K2 Coral */
  --color-accent-soft: #ffe9df;
  --color-deep: #0b1426;          /* Deep Navy */
  --color-deep-2: #131c30;
  --font-sans: "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: "Inter", "Noto Sans JP", sans-serif;
  --container: 1200px;
  --radius: 4px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 8px 32px rgba(11, 20, 38, .08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.7;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: opacity .2s ease; }
a:hover { opacity: .7; }
ul { list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Header
   ============================================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  letter-spacing: -.04em;
  color: var(--color-ink);
}
.logo span { color: var(--color-accent); }
.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav__list {
  display: flex;
  gap: 32px;
  font-size: 14px;
  font-weight: 500;
}
.nav__list a { color: var(--color-ink-soft); }
.nav__list a.is-active { color: var(--color-accent); font-weight: 600; }
.nav__cta {
  background: var(--color-ink);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
}
.nav__cta:hover { background: var(--color-accent); opacity: 1; }
.nav__lang {
  font-size: 12px;
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  padding: 6px 10px;
  border-radius: var(--radius);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: 120px 0 100px;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 90, 31, .08), transparent 50%),
    radial-gradient(circle at 10% 90%, rgba(11, 20, 38, .04), transparent 50%),
    var(--color-bg);
  position: relative;
  overflow: hidden;
}
.hero__eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 28px;
  padding: 6px 14px;
  border: 1px solid var(--color-accent);
  border-radius: 100px;
}
.hero__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 84px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.04em;
  margin-bottom: 32px;
  max-width: 14ch;
}
.hero__title em { font-style: normal; color: var(--color-accent); }
.hero__lead {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 56ch;
  margin-bottom: 48px;
  line-height: 1.8;
}
.hero__ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: all .2s ease;
  cursor: pointer;
  border: none;
}
.btn--primary {
  background: var(--color-ink);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-accent);
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-ink);
}
.btn--ghost:hover {
  background: var(--color-ink);
  color: #fff;
  opacity: 1;
}
.btn--accent {
  background: var(--color-accent);
  color: #fff;
}
.btn--accent:hover { opacity: 1; transform: translateY(-2px); box-shadow: 0 8px 32px rgba(255,90,31,.3); }

/* Hero stats */
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 100px;
  padding-top: 60px;
  border-top: 1px solid var(--color-line);
}
.stat__num {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 56px);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: 1;
  margin-bottom: 8px;
}
.stat__num span { color: var(--color-accent); }
.stat__label {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: .05em;
}

/* ============================================================
   Section
   ============================================================ */
.section {
  padding: 120px 0;
}
.section--surface { background: var(--color-surface); }
.section--dark {
  background: var(--color-deep);
  color: #fff;
}
.section--dark .section__eyebrow { color: var(--color-accent); }
.section--dark .section__title { color: #fff; }
.section--dark .section__lead { color: rgba(255,255,255,.7); }

.section__head {
  max-width: 720px;
  margin: 0 auto 80px;
  text-align: center;
}
.section__head--left { text-align: left; margin-left: 0; }
.section__eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
  display: inline-block;
}
.section__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.03em;
  margin-bottom: 24px;
}
.section__lead {
  font-size: 17px;
  color: var(--color-muted);
  line-height: 1.8;
}

/* ============================================================
   Cards / Grids
   ============================================================ */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  padding: 40px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: all .3s ease;
}
.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: var(--radius);
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 24px;
}
.card__title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}
.card__text {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.8;
}
.card__link {
  display: inline-block;
  margin-top: 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* SSS Pillars */
.pillars { display: grid; grid-template-columns: repeat(3,1fr); gap: 0; border: 1px solid var(--color-line); border-radius: var(--radius); overflow: hidden; }
.pillar { padding: 56px 40px; border-right: 1px solid var(--color-line); transition: background .3s; }
.pillar:last-child { border-right: none; }
.pillar:hover { background: var(--color-surface); }
.pillar__num {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 16px;
  letter-spacing: .1em;
}
.pillar__title {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -.03em;
  margin-bottom: 16px;
}
.pillar__text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
}

/* Audience selector (top page) */
.audience {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--color-deep);
  color: #fff;
  border-radius: var(--radius);
  overflow: hidden;
}
.audience__col {
  padding: 80px 60px;
  position: relative;
  transition: background .3s;
}
.audience__col:first-child { border-right: 1px solid rgba(255,255,255,.1); }
.audience__col:hover { background: var(--color-deep-2); }
.audience__tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: .15em;
  margin-bottom: 16px;
}
.audience__title {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -.03em;
  margin-bottom: 20px;
  line-height: 1.2;
}
.audience__text {
  font-size: 15px;
  color: rgba(255,255,255,.7);
  margin-bottom: 32px;
  line-height: 1.8;
}

/* Project list */
.projects { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--color-line); }
.project {
  display: grid;
  grid-template-columns: 100px 1fr 200px 140px 100px;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: center;
  transition: background .2s;
  cursor: pointer;
}
.project:hover { background: var(--color-surface); padding-left: 12px; padding-right: 12px; }
.project__id { font-size: 12px; color: var(--color-muted); font-weight: 600; letter-spacing: .05em; }
.project__title { font-size: 17px; font-weight: 700; letter-spacing: -.01em; }
.project__skill { font-size: 13px; color: var(--color-muted); }
.project__rate { font-size: 16px; font-weight: 800; color: var(--color-accent); }
.project__arrow { text-align: right; color: var(--color-muted); font-size: 18px; }
.project__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  padding: 3px 8px;
  border-radius: 2px;
  margin-right: 6px;
  letter-spacing: .05em;
}

/* Process / Timeline */
.process { display: grid; grid-template-columns: repeat(4,1fr); gap: 32px; counter-reset: step; }
.step { position: relative; padding-top: 80px; }
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 900;
  color: var(--color-accent);
  opacity: .2;
  letter-spacing: -.05em;
}
.step__title { font-size: 20px; font-weight: 800; margin-bottom: 12px; letter-spacing: -.02em; }
.step__text { font-size: 14px; color: var(--color-muted); line-height: 1.8; }

/* CTA strip */
.cta-strip {
  background: var(--color-ink);
  color: #fff;
  padding: 100px 0;
  text-align: center;
}
.cta-strip__title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  letter-spacing: -.03em;
  margin-bottom: 24px;
  line-height: 1.2;
}
.cta-strip__text {
  font-size: 16px;
  color: rgba(255,255,255,.7);
  max-width: 56ch;
  margin: 0 auto 40px;
}

/* Footer */
.footer {
  background: var(--color-deep);
  color: #fff;
  padding: 80px 0 40px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}
.footer__logo { font-size: 28px; font-weight: 900; margin-bottom: 16px; letter-spacing: -.04em; }
.footer__logo span { color: var(--color-accent); }
.footer__about { color: rgba(255,255,255,.6); font-size: 14px; line-height: 1.8; max-width: 36ch; }
.footer__heading {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  margin-bottom: 20px;
  text-transform: uppercase;
  color: rgba(255,255,255,.5);
}
.footer__links { display: flex; flex-direction: column; gap: 12px; font-size: 14px; }
.footer__links a { color: rgba(255,255,255,.85); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: rgba(255,255,255,.5);
  flex-wrap: wrap;
  gap: 16px;
}
.footer__bottom-links { display: flex; gap: 24px; }

/* Marquee */
.marquee {
  background: var(--color-deep);
  color: #fff;
  padding: 24px 0;
  overflow: hidden;
  white-space: nowrap;
  border-top: 1px solid rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.marquee__track { display: inline-block; animation: scroll 40s linear infinite; }
.marquee span {
  display: inline-block;
  margin: 0 32px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
}
.marquee span::after {
  content: "✦";
  color: var(--color-accent);
  margin-left: 64px;
}
@keyframes scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* Page hero (subpages) */
.pagehero {
  padding: 100px 0 80px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}
.pagehero__breadcrumb {
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 24px;
  letter-spacing: .05em;
}
.pagehero__breadcrumb a { color: var(--color-muted); }
.pagehero__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: 24px;
  max-width: 18ch;
}
.pagehero__lead {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 60ch;
  line-height: 1.8;
}

/* About / Team */
.team { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.member {
  background: var(--color-surface);
  padding: 32px;
  border-radius: var(--radius);
  text-align: left;
}
.member__avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-deep));
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 28px;
  font-weight: 800;
}
.member__name { font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.member__role { font-size: 13px; color: var(--color-accent); margin-bottom: 12px; font-weight: 600; }
.member__text { font-size: 13px; color: var(--color-muted); line-height: 1.7; }

/* Timeline (about) */
.timeline { border-left: 2px solid var(--color-line); padding-left: 32px; }
.tl-item { position: relative; padding-bottom: 40px; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -39px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid #fff;
  box-shadow: 0 0 0 1px var(--color-line);
}
.tl-year { font-size: 14px; font-weight: 700; color: var(--color-accent); letter-spacing: .05em; margin-bottom: 8px; }
.tl-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; letter-spacing: -.01em; }
.tl-text { font-size: 14px; color: var(--color-muted); line-height: 1.7; }

/* Form (contact) */
.form { display: grid; gap: 24px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; letter-spacing: .02em; }
.field label .req { color: var(--color-accent); margin-left: 4px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  font-family: inherit;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: #fff;
  transition: border .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.field textarea { resize: vertical; min-height: 140px; }
.field__hint { font-size: 12px; color: var(--color-muted); margin-top: 6px; }

/* Logos band */
.logos {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  align-items: center;
  padding: 40px 0;
  opacity: .7;
}
.logo-chip {
  font-size: 16px;
  font-weight: 800;
  text-align: center;
  letter-spacing: -.02em;
  color: var(--color-muted);
}

/* Big number block */
.bignum {
  font-family: var(--font-display);
  font-size: clamp(80px, 14vw, 200px);
  font-weight: 900;
  letter-spacing: -.06em;
  line-height: 1;
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 900px) {
  .nav__list { display: none; }
  .grid-3, .grid-4, .pillars, .team, .process { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: 80px 0 60px; }
  .hero__stats { grid-template-columns: repeat(2,1fr); margin-top: 60px; }
  .audience { grid-template-columns: 1fr; }
  .audience__col { padding: 48px 32px; }
  .audience__col:first-child { border-right: none; border-bottom: 1px solid rgba(255,255,255,.1); }
  .pillar { border-right: none; border-bottom: 1px solid var(--color-line); }
  .pillar:last-child { border-bottom: none; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .project { grid-template-columns: 1fr; gap: 8px; padding: 20px 0; }
  .form__row { grid-template-columns: 1fr; }
  .section { padding: 80px 0; }
}