/* =========================================================
   SpiraEver Co., Ltd. — Official Website (v3 — Premium)
   Brand Colors (from official logo):
     Logo Blue     #1A8FCE
     Logo Green    #4CB791
     Gradient      blue → green (135deg)
   Design Principles:
     - Slogan appears once (inside logo image), no text repetition
     - Refined typography (Noto Serif JP + Inter + Noto Sans JP)
     - Generous whitespace (8px grid: 8/16/24/32/48/64/96/128)
     - Subtle scroll reveal + cubic-bezier hover
     - Accessibility: focus-visible, prefers-reduced-motion
   ========================================================= */

:root {
  /* Brand colors */
  --c-blue:       #1A8FCE;
  --c-blue-deep:  #0E6FA8;
  --c-blue-soft:  #E8F4FB;
  --c-green:      #4CB791;
  --c-green-deep: #2E9472;
  --c-green-soft: #E6F4EF;

  /* Neutrals (3-step) */
  --c-black:      #1A1A1A;
  --c-text:       #3B3B3F;
  --c-text-soft:  #6B7280;
  --c-text-mute:  #9CA3AF;

  /* Backgrounds */
  --c-bg:         #FFFFFF;
  --c-bg-soft:    #FAFBFC;
  --c-border:     #ECEEF1;
  --c-border-deep:#D9DCE0;

  /* Brand gradient */
  --gradient: linear-gradient(135deg, var(--c-blue) 0%, var(--c-green) 100%);

  /* Typography */
  --f-serif: "Noto Serif JP", "Yu Mincho", "游明朝", serif;
  --f-sans:  "Inter", "Noto Sans JP", "Yu Gothic", "游ゴシック", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 24px 56px rgba(15, 23, 42, 0.10);

  /* Geometry */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --container:        1080px;
  --container-narrow: 760px;

  /* Easing */
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "palt" 1;
}
img { max-width: 100%; display: block; }
a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Hide PC-only line breaks on small screens */
.br-pc { display: inline; }
@media (max-width: 640px) {
  .br-pc { display: none; }
}

/* ========== Scroll Reveal ========== */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.85s var(--ease-out), transform 0.85s var(--ease-out);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid rgba(236, 238, 241, 0.7);
  z-index: 100;
  height: 68px;
  transition: box-shadow 0.3s var(--ease-out);
}
.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--f-serif);
  font-weight: 500;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--c-blue-deep);
}
.nav__brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  transition: transform 0.5s var(--ease-spring);
}
.nav__brand:hover .nav__brand-logo {
  transform: rotate(12deg) scale(1.05);
}
.nav__menu {
  display: flex;
  gap: 36px;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.nav__menu a {
  position: relative;
  padding: 6px 0;
  color: var(--c-text);
}
.nav__menu a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--gradient);
  border-radius: 2px;
  transition: width 0.4s var(--ease-out);
}
.nav__menu a:hover { color: var(--c-blue-deep); opacity: 1; }
.nav__menu a:hover::after { width: 100%; }

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(76, 183, 145, 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 70% 50% at 15% 80%, rgba(26, 143, 206, 0.08) 0%, transparent 70%),
    var(--c-bg);
  overflow: hidden;
  padding: 120px 32px 80px;
}
.hero::before {
  /* Subtle radial gradient halo behind logo */
  content: "";
  position: absolute;
  top: 38%; left: 50%;
  width: 520px; height: 520px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(26, 143, 206, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  max-width: 820px;
  text-align: center;
  z-index: 1;
}
.hero__logo {
  width: clamp(200px, 26vw, 280px);
  height: auto;
  margin: 0 auto 48px;
  filter: drop-shadow(0 10px 24px rgba(26, 143, 206, 0.12));
}
.hero__title {
  font-family: var(--f-serif);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.02em;
  margin-bottom: 48px;
  color: var(--c-black);
}
.hero__title-accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__lead {
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 2.2;
  color: var(--c-text);
  margin-bottom: 28px;
}
.hero__sub {
  font-size: clamp(0.88rem, 1.3vw, 0.98rem);
  line-height: 2.1;
  color: var(--c-text-soft);
}
.hero__scroll {
  position: absolute;
  bottom: 40px; left: 50%;
  transform: translateX(-50%);
  width: 28px; height: 56px;
  border: 1.5px solid var(--c-text-mute);
  border-radius: 999px;
  display: flex;
  justify-content: center;
  padding-top: 10px;
  opacity: 0.55;
  transition: opacity 0.3s var(--ease-out);
}
.hero__scroll:hover { opacity: 1; }
.hero__scroll-line {
  width: 1.5px;
  height: 10px;
  background: var(--c-text-soft);
  border-radius: 2px;
  animation: scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot {
  0%   { transform: translateY(0);  opacity: 1; }
  60%  { transform: translateY(16px); opacity: 0; }
  100% { transform: translateY(0);  opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .hero__scroll-line { animation: none; }
}

/* ========== Section common ========== */
.section { padding: 140px 32px; }
.section__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.section__inner--narrow { max-width: var(--container-narrow); }

.section__eyebrow {
  display: inline-block;
  font-family: var(--f-sans);
  font-size: 0.78rem;
  letter-spacing: 0.42em;
  color: var(--c-blue);
  margin-bottom: 20px;
  text-transform: uppercase;
  font-weight: 600;
  position: relative;
  padding-left: 28px;
}
.section__eyebrow::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 20px; height: 1.5px;
  background: var(--gradient);
  border-radius: 2px;
}
.section__title {
  font-family: var(--f-serif);
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.02em;
  margin-bottom: 36px;
  color: var(--c-black);
}
.section__lead {
  font-size: 1rem;
  line-height: 2.1;
  color: var(--c-text);
  margin-bottom: 72px;
}

/* ========== About ========== */
.section--about {
  background: var(--c-bg-soft);
  position: relative;
}
.about p {
  margin-bottom: 1.6em;
  font-size: 1.04rem;
  color: var(--c-text);
  line-height: 2.15;
}
.about p:last-child { margin-bottom: 0; }
.about strong {
  color: var(--c-blue-deep);
  font-weight: 600;
  font-family: var(--f-serif);
}

/* SPIRA Values */
.values {
  margin-top: 88px;
  padding-top: 64px;
  border-top: 1px solid var(--c-border);
}
.values__caption {
  font-size: 0.9rem;
  color: var(--c-text-soft);
  text-align: center;
  margin-bottom: 36px;
  letter-spacing: 0.04em;
}
.values__caption strong {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  letter-spacing: 0.18em;
  font-family: var(--f-serif);
}
.values__row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.value {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 26px 10px 22px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}
.value:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.value__letter {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-family: var(--f-serif);
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center; justify-content: center;
  margin-bottom: 6px;
  box-shadow: 0 4px 12px rgba(26, 143, 206, 0.22);
}
.value__word {
  font-family: var(--f-serif);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--c-blue-deep);
  letter-spacing: 0.02em;
}
.value__jp {
  font-size: 0.72rem;
  color: var(--c-text-mute);
  letter-spacing: 0.04em;
}

/* ========== Services ========== */
.section--services { background: var(--c-bg); }
.services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 28px;
}
/* Two-column variant (centered, with a max width so cards don't stretch) */
.services--two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-width: 760px;
  margin: 0 auto;
  gap: 32px;
}
@media (max-width: 720px) {
  .services--two { grid-template-columns: 1fr; gap: 22px; }
}
.service {
  position: relative;
  background: var(--c-bg);
  padding: 44px 36px 40px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-border);
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out), border-color 0.45s var(--ease-out);
  overflow: hidden;
}
.service::before {
  /* Top accent bar via gradient */
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0.85;
}
.service:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service__num {
  font-family: var(--f-serif);
  font-size: 2.4rem;
  font-weight: 500;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.55;
  line-height: 1;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}
.service__title {
  font-family: var(--f-serif);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--c-black);
  margin-bottom: 20px;
  line-height: 1.65;
  letter-spacing: 0.02em;
}
.service__body {
  font-size: 0.94rem;
  color: var(--c-text);
  line-height: 2.05;
  margin-bottom: 28px;
}
.service__status {
  display: inline-block;
  padding: 5px 16px;
  background: var(--c-blue-soft);
  color: var(--c-blue-deep);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

/* Linked service card (entire card clickable) */
.service--linked {
  display: block;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}
.service--linked:hover {
  transform: translateY(-8px);
  box-shadow: 0 28px 60px rgba(15, 23, 42, 0.12);
  border-color: transparent;
  opacity: 1;
}
.service--linked:hover .service__title {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: color 0.4s var(--ease-out);
}
.service__arrow {
  position: absolute;
  top: 28px; right: 28px;
  width: 38px; height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-bg-soft);
  color: var(--c-blue);
  border: 1px solid var(--c-border);
  transition: transform 0.4s var(--ease-spring), background 0.4s var(--ease-out), color 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}
.service--linked:hover .service__arrow {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  transform: rotate(0deg) translate(2px, -2px) scale(1.08);
  box-shadow: 0 8px 18px rgba(26, 143, 206, 0.3);
}
.service__arrow svg {
  transition: transform 0.4s var(--ease-out);
}
.service--linked:hover .service__arrow svg {
  transform: translate(1px, -1px);
}
.service--linked:focus-visible {
  outline-offset: 6px;
}
/* Live (配信開始) variant — green/gradient */
.service__status--live {
  background: var(--gradient);
  color: #fff;
  padding-left: 26px;
  position: relative;
  box-shadow: 0 4px 12px rgba(26, 143, 206, 0.25);
}
.service__status--live::before {
  content: "";
  position: absolute;
  left: 12px; top: 50%;
  width: 7px; height: 7px;
  background: #fff;
  border-radius: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7);
  animation: livePulse 2s ease-out infinite;
}
@keyframes livePulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.65); }
  70%  { box-shadow: 0 0 0 8px rgba(255, 255, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .service__status--live::before { animation: none; }
}

/* ========== Company Profile ========== */
.section--company { background: var(--c-bg-soft); }
.profile {
  background: var(--c-bg);
  border-radius: var(--r-md);
  padding: 12px 48px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--c-border);
}
.profile__row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  padding: 26px 0;
  border-bottom: 1px solid var(--c-border);
  align-items: start;
}
.profile__row:last-child { border-bottom: none; }
.profile__row dt {
  font-size: 0.78rem;
  color: var(--c-blue);
  letter-spacing: 0.18em;
  font-weight: 600;
  text-transform: uppercase;
  padding-top: 4px;
  font-family: var(--f-sans);
}
.profile__row dd {
  font-size: 1rem;
  color: var(--c-black);
  line-height: 1.85;
  font-family: var(--f-serif);
  font-weight: 500;
}
.profile__biz li {
  padding: 6px 0 6px 20px;
  position: relative;
  font-size: 0.96rem;
  color: var(--c-text);
  font-family: var(--f-sans);
  font-weight: 400;
  line-height: 1.9;
}
.profile__biz li::before {
  content: "";
  position: absolute;
  left: 0; top: 17px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gradient);
}

/* ========== Contact ========== */
.section--contact { background: var(--c-bg); }
.contact-card {
  background: var(--c-bg-soft);
  padding: 64px 40px;
  border-radius: var(--r-md);
  text-align: center;
  border: 1px solid var(--c-border);
  position: relative;
  overflow: hidden;
  transition: transform 0.5s var(--ease-out), box-shadow 0.5s var(--ease-out), border-color 0.5s var(--ease-out);
}
.contact-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
}
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.contact-card__mail {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--f-serif);
  font-size: clamp(1.3rem, 3vw, 1.85rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  padding: 6px 4px;
  transition: opacity 0.3s var(--ease-out);
}
.contact-card__mail::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.5s var(--ease-out);
}
.contact-card__mail:hover { opacity: 0.85; }
.contact-card__mail:hover::after { transform: scaleX(1); }
.contact-card__note {
  font-size: 0.95rem;
  color: var(--c-text-soft);
  line-height: 2.2;
}
.contact-card__pending {
  display: inline-block;
  font-family: var(--f-serif);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-text-soft);
  padding: 10px 6px 12px;
  position: relative;
}
.contact-card__pending::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0;
  width: 48px; height: 2px;
  background: var(--gradient);
  border-radius: 2px;
  transform: translateX(-50%);
  opacity: 0.6;
}

/* ========== Footer ========== */
.footer {
  background: var(--c-black);
  color: #fff;
  padding: 72px 32px 36px;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--gradient);
  opacity: 0.85;
}
.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.footer__logo {
  width: 52px;
  height: 52px;
  object-fit: contain;
  margin-bottom: 10px;
  opacity: 0.9;
}
.footer__brand-name {
  font-family: var(--f-serif);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.footer__copyright {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.06em;
  font-family: var(--f-sans);
}

/* ========== Responsive ========== */
@media (max-width: 860px) {
  .nav__menu { display: none; }
  .nav__inner { padding: 0 22px; }

  .section { padding: 88px 24px; }
  .section__lead { margin-bottom: 56px; }

  .hero { padding: 110px 24px 70px; min-height: 90vh; }
  .hero__scroll { display: none; }

  .values { margin-top: 60px; padding-top: 48px; }
  .values__row {
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
  }
  .value { padding: 16px 4px; gap: 4px; }
  .value__letter { width: 34px; height: 34px; font-size: 1rem; }
  .value__word { font-size: 0.7rem; }
  .value__jp { font-size: 0.6rem; }

  .services { gap: 20px; }
  .service { padding: 36px 28px 32px; }
  .service__arrow { top: 20px; right: 20px; width: 34px; height: 34px; }

  .profile { padding: 8px 24px; }
  .profile__row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 20px 0;
  }
  .profile__row dt { padding-top: 0; }

  .contact-card { padding: 48px 24px; }
}

@media (max-width: 480px) {
  .values__row { gap: 4px; }
  .value { padding: 12px 2px; }
  .value__letter { width: 30px; height: 30px; font-size: 0.9rem; }

  .section__title { margin-bottom: 28px; }
}