/* =========================================================
   株式会社LiveFree — Corporate Site
   Design system: modern tech, navy / blue, trustworthy
   ========================================================= */

:root {
  /* Palette */
  --c-ink:        #0A1A33;   /* deepest navy — text on light */
  --c-navy:       #0B2147;   /* primary dark surface */
  --c-navy-2:     #0F2C5C;   /* raised dark surface */
  --c-navy-deep:  #061226;   /* near-black navy */
  --c-blue:       #2563EB;   /* primary brand blue */
  --c-blue-600:   #1D4FD8;
  --c-blue-light: #5B8DEF;
  --c-cyan:       #38BDF8;   /* accent, used sparingly */

  --c-text:       #14223C;
  --c-text-soft:  #51607C;
  --c-text-faint: #8A97AE;
  --c-on-dark:    #EAF1FB;
  --c-on-dark-soft:#9FB4D6;

  --c-bg:         #FFFFFF;
  --c-bg-alt:     #F4F7FC;   /* light blue-grey section */
  --c-bg-alt2:    #EDF2FA;
  --c-line:       #E2EAF4;
  --c-line-dark:  rgba(255,255,255,0.12);

  /* Type */
  --f-jp:   "Zen Kaku Gothic New", "Noto Sans JP", system-ui, sans-serif;
  --f-body: "Noto Sans JP", system-ui, sans-serif;
  --f-en:   "Space Grotesk", "Zen Kaku Gothic New", sans-serif;

  /* Scale */
  --t-hero:    clamp(2.4rem, 5.2vw, 4.4rem);
  --t-h1:      clamp(2rem, 4vw, 3.1rem);
  --t-h2:      clamp(1.6rem, 3vw, 2.4rem);
  --t-h3:      1.3rem;
  --t-lead:    clamp(1.05rem, 1.6vw, 1.3rem);
  --t-body:    1rem;
  --t-small:   0.875rem;

  /* Layout */
  --maxw:      1200px;
  --pad-x:     clamp(20px, 5vw, 64px);
  --radius:    8px;
  --radius-sm: 8px;
  --shadow:    0 18px 50px -24px rgba(11, 33, 71, 0.35);
  --shadow-sm: 0 4px 20px -10px rgba(11, 33, 71, 0.25);
  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; letter-spacing: 0 !important; }

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

body {
  font-family: var(--f-body);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.75;
  font-size: var(--t-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--f-jp); font-weight: 700; line-height: 1.32; color: var(--c-ink); letter-spacing: 0.01em; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.en { font-family: var(--f-en); letter-spacing: 0.04em; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad-x); }
.section { padding-block: clamp(64px, 9vw, 130px); }
.section--alt { background: var(--c-bg-alt); }
.section--navy { background: var(--c-navy); color: var(--c-on-dark); }
.section--navy h1, .section--navy h2, .section--navy h3 { color: #fff; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-en);
  font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--c-blue);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--c-blue); border-radius: 2px; }
.section--navy .eyebrow { color: var(--c-cyan); }
.section--navy .eyebrow::before { background: var(--c-cyan); }

.section-head { max-width: 720px; margin-bottom: clamp(40px, 5vw, 64px); }
.section-head h2 { font-size: var(--t-h2); margin-top: 18px; }
.section-head p { color: var(--c-text-soft); margin-top: 18px; font-size: var(--t-lead); }
.section--navy .section-head p { color: var(--c-on-dark-soft); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-jp); font-weight: 700; font-size: 0.95rem;
  padding: 15px 28px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .25s var(--ease), background .25s var(--ease), box-shadow .25s var(--ease);
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary { background: var(--c-blue); color: #fff; box-shadow: 0 10px 30px -10px rgba(37,99,235,0.6); }
.btn--primary:hover { background: var(--c-blue-600); transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--c-ink); border-color: var(--c-line); }
.btn--ghost:hover { border-color: var(--c-blue); color: var(--c-blue); transform: translateY(-2px); }
.btn--light { background: #fff; color: var(--c-navy); }
.btn--light:hover { transform: translateY(-2px); box-shadow: 0 14px 34px -12px rgba(0,0,0,0.35); }
.btn--outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn--outline-light:hover { border-color: #fff; transform: translateY(-2px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-line);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: center; gap: 11px; }
.brand__mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--c-blue) 0%, var(--c-navy) 100%);
  display: grid; place-items: center; flex-shrink: 0;
  box-shadow: 0 6px 16px -6px rgba(37,99,235,0.6);
}
.brand__mark svg { width: 19px; height: 19px; }
.brand__name { font-family: var(--f-en); font-weight: 700; font-size: 1.18rem; color: var(--c-ink); letter-spacing: 0.01em; }
.brand__name b { color: var(--c-blue); }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  font-family: var(--f-jp); font-weight: 500; font-size: 0.94rem;
  color: var(--c-text); padding: 9px 16px; border-radius: 8px;
  transition: color .2s, background .2s;
}
.nav a:hover { color: var(--c-blue); background: var(--c-bg-alt); }
.nav a.is-active { color: var(--c-blue); }
.header-cta { margin-left: 14px; }
.header-cta .btn { padding: 11px 22px; font-size: 0.9rem; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 44px; height: 44px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--c-ink); margin: 5px auto; border-radius: 2px; transition: transform .3s, opacity .3s; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed; inset: 76px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; padding: 16px var(--pad-x) 28px;
    border-bottom: 1px solid var(--c-line);
    box-shadow: var(--shadow);
    transform: translateY(-120%); transition: transform .38s var(--ease);
    max-height: calc(100vh - 76px); overflow-y: auto;
  }
  .nav.is-open { transform: translateY(0); }
  .nav a { padding: 14px 8px; font-size: 1.05rem; border-bottom: 1px solid var(--c-line); border-radius: 0; }
  .header-cta { margin: 14px 0 0; }
  .header-cta .btn { width: 100%; justify-content: center; padding: 15px; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--c-navy-deep); color: var(--c-on-dark-soft); padding-block: clamp(56px, 7vw, 88px) 36px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; }
.footer-brand .brand__name { color: #fff; }
.footer-brand p { margin-top: 18px; font-size: var(--t-small); line-height: 1.9; max-width: 32ch; }
.footer-col h4 { color: #fff; font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase; font-family: var(--f-en); margin-bottom: 18px; }
.footer-col a, .footer-col p { display: block; font-size: 0.92rem; color: var(--c-on-dark-soft); padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: var(--c-cyan); }
.footer-bottom { margin-top: 52px; padding-top: 26px; border-top: 1px solid var(--c-line-dark); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 0.82rem; color: var(--c-text-faint); }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 36px; } }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }