/* ==========================================================================
   SILVERTARNA — Front Page Styles (Renewal)
   ========================================================================== */

/* ---------- Custom Properties ---------- */
:root {
  --fp-font: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --fp-font-en: "Poppins", var(--fp-font);
  --fp-black: #111;
  --fp-dark: #1a1a1a;
  --fp-text: #333;
  --fp-muted: #777;
  --fp-light: #f5f5f5;
  --fp-lighter: #fafafa;
  --fp-white: #fff;
  --fp-accent: #2b3a44;
  --fp-accent-light: rgba(43, 58, 68, .08);
  --fp-line: rgba(0,0,0,.08);
  --fp-radius: 16px;
  --fp-radius-sm: 10px;
  --fp-shadow: 0 4px 24px rgba(0,0,0,.06);
  --fp-shadow-lg: 0 12px 48px rgba(0,0,0,.10);
  --fp-container: 1140px;
  --fp-transition: .35s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset scoped to .fp ---------- */
.fp { font-family: var(--fp-font); line-height: 1.8; color: var(--fp-text); -webkit-font-smoothing: antialiased; }
.fp *, .fp *::before, .fp *::after { box-sizing: border-box; margin: 0; padding: 0; }
.fp img { max-width: 100%; height: auto; display: block; }
.fp a { color: inherit; text-decoration: none; }
.fp ul { list-style: none; }

/* ---------- Utility ---------- */
.fp-container { max-width: var(--fp-container); margin: 0 auto; padding: 0 24px; }
.fp-sp-only { display: none; }
.fp-pc-only { display: inline; }

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

/* ==========================================================================
   HEADER
   ========================================================================== */
.fp-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 24px; transition: all var(--fp-transition);
}
.fp-header.is-scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 16px rgba(0,0,0,.06);
}
.fp-header__inner {
  max-width: var(--fp-container); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; height: 72px;
}
.fp-header__logo {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
}
.fp-header__logo-img {
  width: 36px; height: auto; filter: brightness(0) invert(1);
  transition: filter var(--fp-transition);
}
.fp-header.is-scrolled .fp-header__logo-img { filter: none; }
.fp-header__logo-text {
  font-family: var(--fp-font-en); font-weight: 800; font-size: 18px;
  letter-spacing: .06em; color: var(--fp-white); transition: color var(--fp-transition);
}
.fp-header.is-scrolled .fp-header__logo-text { color: var(--fp-black); }

.fp-header__nav {
  display: flex; align-items: center; gap: 28px;
}
.fp-header__nav a {
  font-family: var(--fp-font-en); font-size: 14px; font-weight: 600;
  color: rgba(255,255,255,.7); letter-spacing: .04em;
  transition: color var(--fp-transition); text-decoration: none;
}
.fp-header.is-scrolled .fp-header__nav a { color: #555; }
.fp-header__nav a:hover { color: var(--fp-white); }
.fp-header.is-scrolled .fp-header__nav a:hover { color: var(--fp-black); }

.fp-header__contact-btn {
  display: inline-flex; align-items: center;
  padding: 10px 22px; border: 1px solid rgba(255,255,255,.3);
  border-radius: 100px; font-size: 13px !important; font-weight: 700;
  color: var(--fp-white) !important; transition: all var(--fp-transition);
}
.fp-header.is-scrolled .fp-header__contact-btn {
  border-color: var(--fp-black); color: var(--fp-black) !important;
}
.fp-header__contact-btn:hover { background: rgba(255,255,255,.15); }
.fp-header.is-scrolled .fp-header__contact-btn:hover {
  background: var(--fp-black); color: var(--fp-white) !important;
}

/* Mobile toggle */
.fp-header__toggle {
  display: none; width: 44px; height: 44px; border: none; background: transparent;
  cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.fp-header__toggle span {
  display: block; width: 22px; height: 2px; background: var(--fp-white);
  border-radius: 2px; transition: all .3s;
}
.fp-header.is-scrolled .fp-header__toggle span { background: var(--fp-black); }
.fp-header__toggle.is-active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.fp-header__toggle.is-active span:nth-child(2) { opacity: 0; }
.fp-header__toggle.is-active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .fp-header__nav {
    position: fixed; top: 72px; left: 0; right: 0;
    background: rgba(255,255,255,.98); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--fp-line);
    padding: 24px; display: none; flex-direction: column; align-items: flex-start; gap: 20px;
  }
  .fp-header__nav.is-open { display: flex; }
  .fp-header__nav a { color: var(--fp-text) !important; font-size: 16px; }
  .fp-header__contact-btn { border-color: var(--fp-black) !important; color: var(--fp-black) !important; }
  .fp-header__toggle { display: flex; }
}

/* ---------- Buttons ---------- */
.fp-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 16px 36px; border-radius: 100px; font-size: 15px; font-weight: 700;
  letter-spacing: .04em; transition: all var(--fp-transition); border: 2px solid transparent;
  cursor: pointer; text-decoration: none;
}
.fp-btn--primary {
  background: var(--fp-white); color: var(--fp-black); border-color: var(--fp-white);
}
.fp-btn--primary:hover { background: rgba(255,255,255,.9); transform: translateY(-2px); box-shadow: var(--fp-shadow-lg); }
.fp-btn--outline {
  background: transparent; color: var(--fp-white); border-color: rgba(255,255,255,.4);
}
.fp-btn--outline:hover { background: rgba(255,255,255,.12); border-color: var(--fp-white); }
.fp-btn--white {
  background: var(--fp-white); color: var(--fp-black); border-color: var(--fp-white);
}
.fp-btn--white:hover { background: rgba(255,255,255,.9); transform: translateY(-2px); box-shadow: var(--fp-shadow-lg); }

/* ---------- Scroll-triggered Animations ---------- */
.fadeInUp {
  opacity: 0; transform: translateY(32px);
  transition: opacity .7s cubic-bezier(.4,0,.2,1), transform .7s cubic-bezier(.4,0,.2,1);
}
.fadeInUp.is-visible { opacity: 1; transform: translateY(0); }

/* Stagger children */
.fp-grid .fadeInUp:nth-child(2) { transition-delay: .1s; }
.fp-grid .fadeInUp:nth-child(3) { transition-delay: .2s; }
.fp-grid .fadeInUp:nth-child(4) { transition-delay: .15s; }
.fp-works-grid .fadeInUp:nth-child(2) { transition-delay: .12s; }
.fp-works-grid .fadeInUp:nth-child(3) { transition-delay: .24s; }
.fp-process .fadeInUp:nth-child(2) { transition-delay: .08s; }
.fp-process .fadeInUp:nth-child(3) { transition-delay: .16s; }
.fp-process .fadeInUp:nth-child(4) { transition-delay: .24s; }
.fp-process .fadeInUp:nth-child(5) { transition-delay: .32s; }
.fp-faq .fadeInUp:nth-child(2) { transition-delay: .06s; }
.fp-faq .fadeInUp:nth-child(3) { transition-delay: .12s; }
.fp-faq .fadeInUp:nth-child(4) { transition-delay: .18s; }
.fp-faq .fadeInUp:nth-child(5) { transition-delay: .24s; }

/* ==========================================================================
   HERO
   ========================================================================== */
.fp-hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  overflow: hidden;
}
.fp-hero__bg {
  position: absolute; inset: 0; z-index: 0;
}
.fp-hero__bg video {
  width: 100%; height: 100%; object-fit: cover;
}
.fp-hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,.30) 50%, rgba(0,0,0,.60) 100%);
}
.fp-hero__inner {
  position: relative; z-index: 1; color: var(--fp-white);
  padding-top: 140px; padding-bottom: 80px;
}
.fp-hero__badge {
  display: inline-block; padding: 8px 20px; border: 1px solid rgba(255,255,255,.25);
  border-radius: 100px; font-family: var(--fp-font-en); font-size: 13px;
  letter-spacing: .08em; color: rgba(255,255,255,.8);
  margin-bottom: 24px; backdrop-filter: blur(4px); background: rgba(255,255,255,.06);
}
.fp-hero__title {
  font-size: clamp(32px, 5vw, 56px); font-weight: 800; line-height: 1.25;
  margin-bottom: 20px; letter-spacing: -.01em;
}
.fp-hero__title span {
  background: linear-gradient(90deg, #fff 0%, rgba(255,255,255,.7) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.fp-hero__lead {
  font-size: 17px; line-height: 1.9; color: rgba(255,255,255,.75);
  max-width: 600px; margin-bottom: 36px;
}
.fp-hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* Scroll indicator */
.fp-hero__scroll {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.fp-hero__scroll span {
  font-family: var(--fp-font-en); font-size: 11px; letter-spacing: .15em;
  color: rgba(255,255,255,.5); text-transform: uppercase;
}
.fp-hero__scroll-line {
  width: 1px; height: 48px; background: rgba(255,255,255,.2); position: relative; overflow: hidden;
}
.fp-hero__scroll-line::after {
  content: ''; position: absolute; top: -48px; left: 0; width: 1px; height: 48px;
  background: rgba(255,255,255,.8);
  animation: fpScrollLine 1.8s ease-in-out infinite;
}
@keyframes fpScrollLine {
  0% { transform: translateY(0); }
  100% { transform: translateY(96px); }
}

/* ==========================================================================
   SECTIONS (common)
   ========================================================================== */
.fp-section { padding: 100px 0; }
.fp-section--alt { background: var(--fp-lighter); }
.fp-section--dark { background: var(--fp-dark); color: var(--fp-white); }

.fp-section__head { text-align: center; margin-bottom: 56px; }
.fp-section__label {
  display: inline-block; font-family: var(--fp-font-en); font-size: 13px;
  font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: var(--fp-muted); margin-bottom: 12px;
}
.fp-section__label--light { color: rgba(255,255,255,.5); }
.fp-section__title {
  font-size: clamp(24px, 3.2vw, 36px); font-weight: 800; line-height: 1.35;
  margin-bottom: 12px;
}
.fp-section__title--light { color: var(--fp-white); }
.fp-section__sub {
  font-size: 16px; color: var(--fp-muted); max-width: 560px; margin: 0 auto;
}
.fp-section__sub--light { color: rgba(255,255,255,.55); }

/* ---------- Grid ---------- */
.fp-grid { display: grid; gap: 24px; }
.fp-grid--3 { grid-template-columns: repeat(3, 1fr); }
.fp-grid--2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 768px) {
  .fp-grid--3 { grid-template-columns: 1fr; }
  .fp-grid--2 { grid-template-columns: 1fr; }
}

/* ==========================================================================
   STRENGTH CARDS
   ========================================================================== */
.fp-card {
  background: var(--fp-white); border: 1px solid var(--fp-line);
  border-radius: var(--fp-radius); padding: 36px 28px;
  transition: transform var(--fp-transition), box-shadow var(--fp-transition);
}
.fp-card:hover { transform: translateY(-4px); box-shadow: var(--fp-shadow-lg); }
.fp-card--icon .fp-card__icon {
  width: 52px; height: 52px; display: flex; align-items: center; justify-content: center;
  border-radius: 14px; background: var(--fp-accent-light); margin-bottom: 20px;
}
.fp-card--icon .fp-card__icon svg { width: 26px; height: 26px; color: var(--fp-accent); }
.fp-card__title { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.fp-card__text { font-size: 15px; color: var(--fp-muted); line-height: 1.8; }

/* ==========================================================================
   WORKS
   ========================================================================== */
.fp-works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.fp-work {
  display: block; border-radius: var(--fp-radius); overflow: hidden;
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  transition: transform var(--fp-transition), box-shadow var(--fp-transition);
  text-decoration: none;
}
.fp-work:hover { transform: translateY(-6px); box-shadow: var(--fp-shadow-lg); }
.fp-work__thumb {
  position: relative; overflow: hidden; aspect-ratio: 16/10;
}
.fp-work__thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .6s ease;
}
.fp-work:hover .fp-work__thumb img { transform: scale(1.06); }
.fp-work__info { padding: 20px 24px 24px; }
.fp-work__tag {
  display: inline-block; font-family: var(--fp-font-en); font-size: 12px;
  font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: rgba(255,255,255,.45); margin-bottom: 6px;
}
.fp-work__title { font-size: 17px; font-weight: 700; margin-bottom: 6px; color: var(--fp-white); }
.fp-work__desc { font-size: 14px; color: rgba(255,255,255,.5); }

@media (max-width: 768px) {
  .fp-works-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   SERVICE
   ========================================================================== */
.fp-service {
  background: var(--fp-white); border: 1px solid var(--fp-line);
  border-radius: var(--fp-radius); padding: 32px 28px;
  position: relative; overflow: hidden;
  transition: transform var(--fp-transition), box-shadow var(--fp-transition);
}
.fp-service:hover { transform: translateY(-4px); box-shadow: var(--fp-shadow-lg); }
.fp-service__number {
  font-family: var(--fp-font-en); font-size: 52px; font-weight: 800;
  color: rgba(0,0,0,.04); line-height: 1; margin-bottom: 0;
  position: absolute; top: 20px; right: 24px;
}
.fp-service__title { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.fp-service__list { padding-left: 0; }
.fp-service__list li {
  position: relative; padding: 10px 0 10px 20px; font-size: 15px;
  color: var(--fp-muted); border-bottom: 1px solid var(--fp-line);
}
.fp-service__list li:last-child { border-bottom: none; }
.fp-service__list li::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 6px; height: 6px; border-radius: 50%; background: var(--fp-accent);
}

/* ==========================================================================
   PROCESS
   ========================================================================== */
.fp-process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }

.fp-process__item {
  text-align: center; padding: 32px 16px; position: relative;
  background: var(--fp-white); border: 1px solid var(--fp-line);
  border-radius: var(--fp-radius); transition: transform var(--fp-transition);
}
.fp-process__item:hover { transform: translateY(-4px); }
.fp-process__step {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--fp-black); color: var(--fp-white);
  font-family: var(--fp-font-en); font-size: 16px; font-weight: 700;
  margin-bottom: 16px;
}
.fp-process__title { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.fp-process__text { font-size: 14px; color: var(--fp-muted); }

/* Arrow connectors */
.fp-process__item:not(:last-child)::after {
  content: ''; position: absolute; top: 50%; right: -12px;
  width: 8px; height: 8px; border-top: 2px solid #bbb;
  border-right: 2px solid #bbb; transform: translateY(-50%) rotate(45deg);
  z-index: 1;
}

@media (max-width: 768px) {
  .fp-process { grid-template-columns: 1fr; gap: 12px; }
  .fp-process__item { display: flex; align-items: center; gap: 16px; text-align: left; padding: 20px 24px; }
  .fp-process__step { flex-shrink: 0; margin-bottom: 0; }
  .fp-process__item:not(:last-child)::after { display: none; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .fp-process { grid-template-columns: repeat(3, 1fr); }
  .fp-process__item:nth-child(3)::after { display: none; }
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.fp-faq { max-width: 720px; margin: 0 auto; display: grid; gap: 12px; }

.fp-faq__item {
  background: var(--fp-white); border: 1px solid var(--fp-line);
  border-radius: var(--fp-radius-sm); overflow: hidden;
  transition: box-shadow var(--fp-transition);
}
.fp-faq__item:hover { box-shadow: var(--fp-shadow); }
.fp-faq__item[open] { box-shadow: var(--fp-shadow); }
.fp-faq__q {
  padding: 20px 24px; font-size: 16px; font-weight: 700; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  list-style: none;
}
.fp-faq__q::-webkit-details-marker { display: none; }
.fp-faq__q::after {
  content: '+'; font-size: 22px; font-weight: 300; color: var(--fp-muted);
  flex-shrink: 0; margin-left: 16px;
  transition: transform var(--fp-transition);
}
.fp-faq__item[open] .fp-faq__q::after { content: '\2212'; }
.fp-faq__a {
  padding: 0 24px 20px; font-size: 15px; color: var(--fp-muted); line-height: 1.8;
}

/* ==========================================================================
   CTA
   ========================================================================== */
.fp-cta {
  position: relative; padding: 120px 0; text-align: center; overflow: hidden;
}
.fp-cta__bg {
  position: absolute; inset: 0; z-index: 0;
}
.fp-cta__bg img {
  width: 100%; height: 100%; object-fit: cover;
}
.fp-cta__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.65) 0%, rgba(0,0,0,.55) 100%);
}
.fp-cta__inner {
  position: relative; z-index: 1; color: var(--fp-white);
}
.fp-cta__title {
  font-size: clamp(24px, 3.5vw, 36px); font-weight: 800; margin-bottom: 16px;
}
.fp-cta__lead {
  font-size: 16px; color: rgba(255,255,255,.7); margin-bottom: 36px; line-height: 1.9;
}
.fp-cta__note {
  margin-top: 16px; font-size: 13px; color: rgba(255,255,255,.45);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.fp-footer {
  background: var(--fp-dark); color: rgba(255,255,255,.6);
  padding: 60px 0 40px;
}
.fp-footer__inner {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 40px;
}
.fp-footer__brand { flex-shrink: 0; }
.fp-footer__logo {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
  margin-bottom: 12px;
}
.fp-footer__logo span {
  font-family: var(--fp-font-en); font-weight: 700; font-size: 16px;
  color: rgba(255,255,255,.7); letter-spacing: .06em;
}
.fp-footer__copy { font-size: 12px; color: rgba(255,255,255,.3); }

.fp-footer__nav {
  display: flex; gap: 48px;
}
.fp-footer__nav-group h4 {
  font-family: var(--fp-font-en); font-size: 13px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.5);
  margin-bottom: 12px;
}
.fp-footer__nav-group a {
  display: block; font-size: 14px; color: rgba(255,255,255,.4);
  padding: 4px 0; transition: color var(--fp-transition); text-decoration: none;
}
.fp-footer__nav-group a:hover { color: rgba(255,255,255,.8); }

@media (max-width: 768px) {
  .fp-footer__inner { flex-direction: column; gap: 32px; }
  .fp-footer__nav { flex-direction: column; gap: 24px; }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .fp-hero__inner { padding-top: 100px; padding-bottom: 60px; }
  .fp-hero__title { font-size: 28px; }
  .fp-hero__lead { font-size: 15px; }
  .fp-hero__cta { flex-direction: column; }
  .fp-hero__cta .fp-btn { width: 100%; justify-content: center; }
  .fp-hero__scroll { bottom: 16px; }

  .fp-section { padding: 72px 0; }
  .fp-section__head { margin-bottom: 40px; }
  .fp-section__title { font-size: 24px; }

  .fp-cta { padding: 80px 0; }
  .fp-cta__title { font-size: 24px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .fp-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .fp-works-grid { grid-template-columns: repeat(2, 1fr); }
}