/* ============================================
   株式会社Kiy コーポレートサイト — style.css
   ============================================ */

:root {
  /* Brand */
  --color-primary:      #3B5BDB;
  --color-primary-dark: #2F4ABF;
  --color-primary-light:#E8EDFF;
  --color-accent:       #00CFE8;

  /* Dark */
  --color-dark:         #0F172A;
  --color-dark-800:     #1E293B;
  --color-dark-700:     #334155;
  --color-dark-500:     #64748B;
  --color-dark-300:     #CBD5E1;
  --color-dark-100:     #F1F5F9;

  /* Base */
  --color-bg:           #FAFAFA;
  --color-surface:      #FFFFFF;
  --color-border:       #E2E8F0;
  --color-text:         #0F172A;
  --color-text-sub:     #475569;
  --color-text-muted:   #94A3B8;

  /* Layout */
  --container-max:      1120px;
  --section-gap:        100px;
  --card-radius:        16px;
  --btn-radius:         8px;

  /* Shadow */
  --shadow-sm:  0 1px 4px rgba(15,23,42,0.06);
  --shadow-md:  0 4px 20px rgba(15,23,42,0.08);
  --shadow-lg:  0 12px 48px rgba(15,23,42,0.12);

  --transition: 0.22s ease;

  --font-heading: 'Noto Sans JP', sans-serif;
  --font-body:    'DM Sans', 'Noto Sans JP', sans-serif;
}

/* ---------- Reset ---------- */
*, *::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);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Section ---------- */
.section { padding-block: var(--section-gap); }
.section__header { text-align: center; margin-bottom: 56px; }
.section__label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.section__title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
}
.section__desc {
  font-size: 17px;
  color: var(--color-text-sub);
  max-width: 520px;
  margin-inline: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--btn-radius);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  cursor: pointer;
  white-space: nowrap;
  line-height: 1;
}
.btn:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 3px; }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 12px rgba(59,91,219,0.3);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59,91,219,0.4);
}
.btn--ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.4);
}
.btn--ghost:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.btn--outline:hover { background: var(--color-primary-light); transform: translateY(-2px); }
.btn--lg { font-size: 16px; padding: 15px 32px; }
.btn--sm { font-size: 13px; padding: 9px 18px; }
.btn--full { width: 100%; justify-content: center; }

/* ---------- HEADER ---------- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.header.is-scrolled { box-shadow: var(--shadow-md); }
.header__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo__mark {
  width: 32px; height: 32px;
  background: var(--color-dark);
  color: #fff;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-body);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.logo__mark--sm { width: 28px; height: 28px; font-size: 15px; }
.logo__text {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 17px;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.logo--light .logo__text { color: rgba(255,255,255,0.85); }
.logo--light .logo__mark { background: rgba(255,255,255,0.15); }
.logo__suffix {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-left: 4px;
  letter-spacing: 0;
}
.logo--light .logo__suffix { color: rgba(255,255,255,0.45); }

.nav { margin-left: auto; }
.nav__list { display: flex; gap: 2px; }
.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-sub);
  padding: 6px 12px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover { color: var(--color-primary); background: var(--color-primary-light); }

.header__cta { margin-left: 8px; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 8px;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: 64px; right: 0; bottom: 0;
  width: 280px;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  padding: 32px 24px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
}
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu__list { display: flex; flex-direction: column; gap: 8px; }
.mobile-menu__link {
  display: block;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: 8px;
  transition: background var(--transition);
}
.mobile-menu__link:hover { background: var(--color-primary-light); color: var(--color-primary); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  background: var(--color-dark);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.18;
}
.hero__glow--1 {
  width: 600px; height: 600px;
  background: var(--color-primary);
  top: -100px; right: -100px;
}
.hero__glow--2 {
  width: 400px; height: 400px;
  background: var(--color-accent);
  bottom: -80px; left: -60px;
}
.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: 80px;
  max-width: 800px;
}
.hero__eyebrow {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 20px;
}
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(36px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}
.hero__title em {
  font-style: normal;
  color: var(--color-accent);
}
.hero__sub {
  font-size: clamp(15px, 2vw, 18px);
  color: rgba(255,255,255,0.65);
  line-height: 1.9;
  margin-bottom: 40px;
  max-width: 580px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero__scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero__scroll-hint span {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.35));
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint {
  0%   { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50%  { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(1); transform-origin: bottom; }
}

/* ---------- ABOUT ---------- */
.about { background: var(--color-surface); }
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about__text .section__label { display: block; margin-bottom: 12px; }
.about__text .section__title { text-align: left; margin-bottom: 20px; }
.about__lead {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.6;
}
.about__body {
  font-size: 15px;
  color: var(--color-text-sub);
  line-height: 1.85;
  margin-bottom: 14px;
}
.about__values {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.value-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  transition: transform var(--transition), box-shadow var(--transition);
}
.value-card:hover { transform: translateX(4px); box-shadow: var(--shadow-sm); }
.value-card__icon { font-size: 24px; flex-shrink: 0; margin-top: 2px; }
.value-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
  color: var(--color-primary);
}
.value-card__desc { font-size: 14px; color: var(--color-text-sub); line-height: 1.7; }

/* ---------- SERVICES ---------- */
.services { background: var(--color-bg); }
.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.service-card--featured {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-sm);
}
.service-card__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px 10px;
  border-radius: 4px;
  width: fit-content;
}
.service-card__icon { font-size: 36px; }
.service-card__title {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
}
.service-card__desc {
  font-size: 15px;
  color: var(--color-text-sub);
  line-height: 1.8;
}
.service-card__points {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.service-card__points li {
  font-size: 14px;
  color: var(--color-text-sub);
  padding-left: 18px;
  position: relative;
}
.service-card__points li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}
.service-card__link {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition), color var(--transition);
}
.service-card__link:hover { gap: 8px; color: var(--color-primary-dark); }

/* ---------- NEWS ---------- */
.news { background: var(--color-dark); }
.news .section__label { color: var(--color-accent); }
.news .section__title { color: #fff; }
.news .section__desc  { color: rgba(255,255,255,0.55); }
.news__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.news__header .section__label { display: block; margin-bottom: 12px; }
.news__header .section__title { text-align: left; margin-bottom: 12px; }
.news__header .section__desc  { text-align: left; margin-inline: 0; margin-bottom: 28px; }
.news__card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--card-radius);
  overflow: hidden;
}
.news__card-inner { padding: 36px; }
.news__card-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.news__card-text {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
  line-height: 1.85;
  margin-bottom: 24px;
}
.news__card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding-bottom: 2px;
  transition: border-color var(--transition), color var(--transition);
}
.news__card-link:hover { color: var(--color-accent); border-color: var(--color-accent); }
.news__card-link::after { content: '↗'; font-size: 12px; }

/* ---------- COMPANY ---------- */
.company { background: var(--color-surface); }
.company-table {
  width: 100%;
  max-width: 760px;
  margin-inline: auto;
  border-collapse: collapse;
}
.company-table th,
.company-table td {
  padding: 18px 24px;
  font-size: 15px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
.company-table th {
  width: 180px;
  font-weight: 700;
  color: var(--color-text-sub);
  white-space: nowrap;
}
.company-table td { color: var(--color-text); }
.company-table a { color: var(--color-primary); text-decoration: underline; }
.company-table tr:last-child th,
.company-table tr:last-child td { border-bottom: none; }
.company-table tr:hover td,
.company-table tr:hover th { background: var(--color-bg); }

/* ---------- CONTACT ---------- */
.contact { background: var(--color-bg); }
.contact__form {
  max-width: 640px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form__group { display: flex; flex-direction: column; gap: 6px; }
.form__label { font-size: 14px; font-weight: 700; color: var(--color-text); }
.form__required { color: #E53E3E; margin-left: 2px; }
.form__input, .form__select, .form__textarea {
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form__input:focus, .form__select:focus, .form__textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59,91,219,0.15);
}
.form__textarea { resize: vertical; min-height: 120px; }
.form__notice { font-size: 14px; text-align: center; min-height: 20px; }
.form__notice.is-success { color: #38A169; }
.form__notice.is-error   { color: #E53E3E; }

/* ---------- FOOTER ---------- */
.footer { background: var(--color-dark-800); color: rgba(255,255,255,0.55); }
.footer__inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-top: 64px;
  padding-bottom: 48px;
}
.footer__tagline { font-size: 13px; margin-top: 12px; }
.footer__links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer__col-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.85);
  margin-bottom: 14px;
}
.footer__col ul { display: flex; flex-direction: column; gap: 8px; }
.footer__col a { font-size: 14px; color: rgba(255,255,255,0.45); transition: color var(--transition); }
.footer__col a:hover { color: #fff; }
.footer__bottom { background: rgba(0,0,0,0.25); padding-block: 20px; }
.footer__bottom .container { text-align: center; }
.footer__copy { font-size: 12px; color: rgba(255,255,255,0.3); }

/* ---------- BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 24px;
  width: 42px; height: 42px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 900;
}
.back-to-top:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.back-to-top[hidden] { display: none; }

/* ---------- ANIMATIONS ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.is-visible { opacity: 1; transform: translateY(0); }

.hero__eyebrow.animate-on-scroll { transition-delay: 0s; }
.hero__title.animate-on-scroll   { transition-delay: 0.08s; }
.hero__sub.animate-on-scroll     { transition-delay: 0.16s; }
.hero__actions.animate-on-scroll { transition-delay: 0.24s; }

.services__grid .service-card:nth-child(2) { transition-delay: 0.1s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .nav { display: none; }
  .header__cta { display: none; }
  .hamburger { display: flex; }
  .about__inner { grid-template-columns: 1fr; gap: 48px; }
  .news__inner { grid-template-columns: 1fr; gap: 40px; }
  .footer__inner { grid-template-columns: 1fr; gap: 40px; }
  .footer__links { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-gap: 64px; }
  .services__grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .company-table th { width: 120px; }
  .footer__links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  :root { --section-gap: 48px; }
  .hero__actions { flex-direction: column; }
  .footer__links { grid-template-columns: 1fr; }
  .footer__inner { padding-top: 48px; }
}