/* ============================================
   Link T&B Design System — LYZON-Inspired
   Clean, white-based, blue accent, enterprise
   ============================================ */

/* ---------- Reset & Base ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:'Noto Sans JP','Helvetica Neue',Arial,sans-serif;color:#1a1a1a;line-height:1.8;background:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none}

/* ---------- CSS Variables ---------- */
:root{
  --blue:#0068c9;
  --blue-light:#e8f1fb;
  --dark:#1a1a2e;
  --black:#111;
  --gray-50:#f7f8fa;
  --gray-100:#eef0f4;
  --gray-200:#dde0e6;
  --gray-400:#999;
  --gray-600:#666;
  --white:#fff;
  --max-width:1100px;
  --header-h:80px;
  --section-py:80px;
  --transition:0.3s ease;
}

/* ---------- Utility ---------- */
.container{max-width:var(--max-width);margin:0 auto;padding:0 40px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ---------- Section Title Pattern (LYZON style) ---------- */
.sec-title{font-size:2rem;font-weight:700;line-height:1.4;letter-spacing:.02em}
.sec-label{display:block;font-size:.8125rem;font-weight:600;color:var(--blue);letter-spacing:.15em;text-transform:uppercase;margin-top:8px}
.sec-lead{margin-top:24px;font-size:.9375rem;color:var(--gray-600);line-height:2;max-width:640px}

/* ---------- Header ---------- */
.header{position:fixed;top:0;left:0;width:100%;height:var(--header-h);background:var(--white);z-index:1000;border-bottom:1px solid var(--gray-200)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.header__logo{display:flex;align-items:center;gap:8px;font-size:1.375rem;font-weight:800;letter-spacing:.04em}
.header__logo a{display:flex;align-items:center;gap:8px}
.header__logo .logo-img{height:48px;width:auto}
.header__logo .logo-mark{width:32px;height:32px;background:var(--blue);border-radius:4px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:14px}
.header__logo .logo-text span{color:var(--blue)}

.header__nav{display:flex;align-items:center;gap:20px}
.header__nav a,.header__nav button{font-size:.875rem;font-weight:500;color:var(--black);transition:color var(--transition)}
.header__nav a:hover,.header__nav button:hover{color:var(--blue)}
.header__nav a[href*="recruit"]{margin-left:0}

/* Dropdown */
.nav-dropdown{position:relative}
.nav-dropdown__trigger{display:flex;align-items:center;gap:4px}
.nav-dropdown__trigger::after{content:'';width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin-top:-2px;transition:transform var(--transition)}
.nav-dropdown:hover .nav-dropdown__trigger::after{transform:rotate(-135deg)}
.nav-dropdown__menu{position:absolute;top:100%;left:-16px;min-width:200px;background:var(--white);border:1px solid var(--gray-200);border-radius:8px;padding:8px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:all var(--transition);box-shadow:0 8px 32px rgba(0,0,0,.08)}
.nav-dropdown:hover .nav-dropdown__menu{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dropdown__menu a{display:block;padding:10px 24px;font-size:.8125rem;white-space:nowrap}
.nav-dropdown__menu a:hover{background:var(--gray-50);color:var(--blue)}

/* CTA button in header */
.btn-contact{display:inline-flex;align-items:center;padding:10px 28px;background:var(--black);color:var(--white)!important;border-radius:4px;font-size:.8125rem;font-weight:600;transition:background var(--transition)}
.btn-contact:hover{background:#333}

/* ---------- Hero ---------- */
.hero{position:relative;width:100%;min-height:100vh;display:flex;align-items:center;overflow:hidden;margin-top:var(--header-h)}
.hero__bg{position:absolute;inset:0;background:url('../img/hero-bg.jpg') center/cover no-repeat;z-index:0}
.hero__bg::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,22,40,.75) 0%,rgba(22,42,74,.6) 40%,rgba(26,58,92,.5) 100%)}
/* Video hero */
.hero--video .hero__bg{background:var(--dark)}
.hero--video .hero__bg video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero__overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,22,40,.50) 0%,rgba(22,42,74,.38) 40%,rgba(26,58,92,.30) 100%);z-index:1}
.hero--video .hero__content{z-index:2}
.hero__content{position:relative;z-index:1;padding:0 0 80px}
.hero__catch{font-size:clamp(2rem,4.2vw,3.5rem);font-weight:800;color:var(--white);line-height:1.2;letter-spacing:-.02em;text-shadow:0 2px 20px rgba(0,0,0,.5),0 1px 4px rgba(0,0,0,.4);animation:heroFadeUp .9s ease-out both}
.hero__sub{margin-top:24px;font-size:clamp(1.1rem,2.4vw,1.75rem);color:rgba(255,255,255,.95);line-height:1.7;max-width:none;text-shadow:0 1px 10px rgba(0,0,0,.5);font-weight:600;letter-spacing:.02em;animation:heroFadeUp .9s ease-out .4s both}
@keyframes heroFadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.hero__actions{margin-top:48px;display:flex;gap:16px;flex-wrap:wrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;font-size:.875rem;font-weight:600;border-radius:4px;transition:all var(--transition)}
.btn--primary{background:var(--blue);color:var(--white)}
.btn--primary:hover{background:#0055a3}
.btn--outline{border:1px solid rgba(255,255,255,.4);color:var(--white)}
.btn--outline:hover{border-color:var(--white);background:rgba(255,255,255,.1)}
.btn--dark{background:var(--black);color:var(--white)}
.btn--dark:hover{background:#333}
.btn--ghost{color:var(--black);padding:14px 0}
.btn--ghost:hover{color:var(--blue)}

/* Arrow link (LYZON pattern) */
.arrow-link{display:inline-flex;align-items:center;gap:12px;font-size:.875rem;font-weight:500;transition:color var(--transition)}
.arrow-link:hover{color:var(--blue)}
.arrow-link__circle{width:48px;height:48px;border-radius:50%;border:1px solid var(--gray-200);display:flex;align-items:center;justify-content:center;transition:all var(--transition)}
.arrow-link:hover .arrow-link__circle{border-color:var(--blue);background:var(--blue)}
.arrow-link__circle svg{width:20px;height:20px;transition:all var(--transition)}
.arrow-link:hover .arrow-link__circle svg{stroke:var(--white)}
.arrow-link--right{justify-content:flex-end}

/* ---------- Sections ---------- */
.section{padding:var(--section-py) 0}
.section--gray{background:var(--gray-50)}
.section--dark{background:var(--dark);color:var(--white)}
.section--dark .sec-label{color:var(--blue)}
.section--dark .sec-lead{color:rgba(255,255,255,.6)}

.section__header{margin-bottom:40px}
.section__more{margin-top:40px;display:flex;justify-content:flex-end}

/* ---------- Works (Case Studies) ---------- */
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.work-card{display:block;transition:transform var(--transition)}
.work-card:hover{transform:translateY(-4px)}
.work-card__img{aspect-ratio:16/10;background:var(--gray-100);border-radius:8px;overflow:hidden;margin-bottom:16px}
.work-card__img img{width:100%;height:100%;object-fit:cover}
.work-card__company{font-size:.75rem;color:var(--gray-400);margin-bottom:4px}
.work-card__title{font-size:.9375rem;font-weight:700;line-height:1.6}
.work-card__meta{font-size:.75rem;color:var(--gray-600);margin-top:8px}

/* ---------- Service Grid (2x2 with icon) ---------- */
.service-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--gray-200)}
.service-item{display:flex;align-items:flex-start;gap:24px;padding:40px 0;border-bottom:1px solid var(--gray-200)}
.service-item:nth-child(odd){padding-right:40px;border-right:1px solid var(--gray-200)}
.service-item:nth-child(even){padding-left:40px}
.service-item__icon{width:72px;height:72px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:2.5rem}
.service-item__body{flex:1}
.service-item__name{font-size:1.125rem;font-weight:700;margin-bottom:8px}
.service-item__desc{font-size:.8125rem;color:var(--gray-600);line-height:1.9;margin-bottom:16px}
.service-item__link{display:inline-flex;align-items:center;gap:8px;font-size:.8125rem;color:var(--gray-400);transition:color var(--transition)}
.service-item__link:hover{color:var(--blue)}
.service-item__link svg{width:24px;height:24px}

/* ---------- Feature (2-column) ---------- */
.feature-layout{display:grid;grid-template-columns:320px 1fr;gap:80px;align-items:start}
.feature-right__heading{font-size:1.5rem;font-weight:700;line-height:1.6;margin-bottom:32px}
.feature-right__list{display:flex;flex-direction:column;gap:24px}
.feature-right__item{display:flex;gap:16px;font-size:.9375rem;line-height:1.9}
.feature-right__item::before{content:'—';color:var(--gray-400);flex-shrink:0}

/* ---------- Value Tabs (Carousel-like) ---------- */
.value-tabs{display:flex;gap:32px;border-bottom:2px solid var(--gray-200);margin-bottom:40px}
.value-tab{padding:12px 0;font-size:.875rem;font-weight:500;color:var(--gray-400);border-bottom:2px solid transparent;margin-bottom:-2px;cursor:pointer;transition:all var(--transition);white-space:nowrap}
.value-tab.active,.value-tab:hover{color:var(--black);border-bottom-color:var(--black)}

.value-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.value-card{background:var(--gray-50);border-radius:12px;overflow:hidden;padding:32px;transition:box-shadow var(--transition)}
.value-card:hover{box-shadow:0 8px 32px rgba(0,0,0,.06)}
.value-card__tag{display:inline-block;font-size:.6875rem;font-weight:600;color:var(--blue);background:var(--blue-light);padding:4px 12px;border-radius:20px;margin-bottom:12px}
.value-card__title{font-size:1rem;font-weight:700;margin-bottom:8px;line-height:1.5}
.value-card__desc{font-size:.8125rem;color:var(--gray-600);line-height:1.8}

/* ---------- Blog (Featured + List) ---------- */
.blog-layout{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.blog-featured{display:block}
.blog-featured__img{aspect-ratio:4/3;background:var(--gray-100);border-radius:8px;overflow:hidden;margin-bottom:16px}
.blog-featured__img img{width:100%;height:100%;object-fit:cover}
.blog-featured__tag{display:inline-block;font-size:.6875rem;border:1px solid var(--gray-200);padding:4px 12px;border-radius:4px;margin-bottom:8px}
.blog-featured__date{font-size:.75rem;color:var(--gray-400);float:right;margin-top:4px}
.blog-featured__title{font-size:1.125rem;font-weight:700;line-height:1.6}

.blog-list{display:flex;flex-direction:column;gap:0}
.blog-list-item{display:grid;grid-template-columns:160px 1fr;gap:20px;padding:24px 0;border-bottom:1px solid var(--gray-200)}
.blog-list-item:first-child{padding-top:0}
.blog-list-item__img{aspect-ratio:16/10;background:var(--gray-100);border-radius:6px;overflow:hidden}
.blog-list-item__img img{width:100%;height:100%;object-fit:cover}
.blog-list-item__body{display:flex;flex-direction:column;justify-content:center}
.blog-list-item__meta{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.blog-list-item__tag{font-size:.6875rem;border:1px solid var(--gray-200);padding:2px 10px;border-radius:4px}
.blog-list-item__date{font-size:.75rem;color:var(--gray-400)}
.blog-list-item__title{font-size:.875rem;font-weight:600;line-height:1.6}

/* ---------- News Grid ---------- */
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.news-card{display:block;transition:transform var(--transition)}
.news-card:hover{transform:translateY(-4px)}
.news-card__img{aspect-ratio:3/2;background:var(--gray-100);border-radius:8px;overflow:hidden;margin-bottom:12px}
.news-card__img img{width:100%;height:100%;object-fit:cover}
.news-card__meta{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.news-card__tag{font-size:.625rem;font-weight:600;color:var(--blue);border:1px solid var(--blue);padding:2px 10px;border-radius:4px}
.news-card__date{font-size:.75rem;color:var(--gray-400)}
.news-card__title{font-size:.8125rem;font-weight:600;line-height:1.6}

/* ---------- CTA 2-column (Download + Contact) ---------- */
.cta-duo{display:grid;grid-template-columns:1fr 1fr;gap:0}
.cta-duo__item{padding:64px 48px}
.cta-duo__item:first-child{border-right:1px solid var(--gray-200)}
.cta-duo__title{font-size:1.375rem;font-weight:700;margin-bottom:8px}
.cta-duo__label{font-size:.8125rem;font-weight:600;color:var(--blue);letter-spacing:.1em;margin-bottom:16px}
.cta-duo__desc{font-size:.875rem;color:var(--gray-600);line-height:1.9;margin-bottom:24px}
.cta-duo__link{display:inline-flex;align-items:center;gap:8px;font-size:.8125rem;color:var(--gray-400)}
.cta-duo__link svg{width:24px;height:24px;transition:transform var(--transition)}
.cta-duo__link:hover svg{transform:translateX(4px)}

/* ---------- Footer ---------- */
.footer{background:var(--dark);color:var(--white);padding:64px 0 32px}
.footer__top{display:flex;justify-content:space-between;align-items:center;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer__logo{font-size:1.25rem;font-weight:800;letter-spacing:.04em}
.footer__logo span{color:var(--blue)}
.footer-logo-img{height:28px;width:auto;filter:brightness(0) invert(1)}
.footer__services{display:flex;gap:32px}
.footer__services a{font-size:.8125rem;color:rgba(255,255,255,.7);transition:color var(--transition)}
.footer__services a:hover{color:var(--white)}

.footer__bottom{display:flex;justify-content:space-between;align-items:center;padding-top:32px;flex-wrap:wrap;gap:16px}
.footer__links{display:flex;gap:24px}
.footer__links a{font-size:.75rem;color:rgba(255,255,255,.5);transition:color var(--transition)}
.footer__links a:hover{color:var(--white)}
.footer__social{display:flex;gap:16px}
.footer__social a{width:36px;height:36px;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.5);transition:color var(--transition)}
.footer__social a:hover{color:var(--white)}

.footer__copy{text-align:center;padding-top:32px;border-top:1px solid rgba(255,255,255,.08);margin-top:32px}
.footer__copy p{font-size:.6875rem;color:rgba(255,255,255,.35)}

/* ---------- Page Header (Sub pages) ---------- */
.page-hero{padding:160px 0 80px;background:var(--gray-50);position:relative;overflow:hidden}
.page-hero--img{background:none;color:#fff}
.page-hero--img .page-hero__bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0}
.page-hero--img .page-hero__bg::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,22,40,.78) 0%,rgba(22,42,74,.65) 40%,rgba(26,58,92,.55) 100%)}
.page-hero--img .container{position:relative;z-index:1}
.page-hero--img .page-hero__label{color:rgba(255,255,255,.85)}
.page-hero--img .breadcrumb a,.page-hero--img .breadcrumb span{color:rgba(255,255,255,.7)}
.page-hero--img .breadcrumb a:hover{color:#fff}
.page-hero__title{font-size:2rem;font-weight:700}
.page-hero__label{font-size:.8125rem;font-weight:600;color:var(--blue);letter-spacing:.15em;text-transform:uppercase;margin-top:4px}
/* Service-specific hero backgrounds */
.page-hero--rd .page-hero__bg{background-image:url('../img/section-bg-circuit.jpg')}
.page-hero--it .page-hero__bg{background-image:url('../img/hero-it.jpg')}
.page-hero--ev .page-hero__bg{background-image:url('../img/hero-ev.jpg')}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.75rem;color:var(--gray-400);border-bottom:1px solid var(--gray-100)}
.breadcrumb a{transition:color var(--transition)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb span{margin:0 8px}

/* ---------- Contact Form ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group--full{grid-column:1/-1}
.form-label{font-size:.8125rem;font-weight:600}
.form-label .req{color:#e53935;font-size:.6875rem;margin-left:4px}
.form-input,.form-textarea,.form-select{border:1px solid var(--gray-200);border-radius:6px;padding:12px 16px;font-size:.875rem;transition:border-color var(--transition);font-family:inherit}
.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--blue)}
.form-textarea{min-height:160px;resize:vertical}
.form-submit{margin-top:32px;text-align:center}

/* ---------- Chatbot Widget Placeholder ---------- */
.chat-widget{position:fixed;bottom:24px;right:24px;z-index:999;display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.chat-widget__label{background:var(--white);padding:8px 16px;border-radius:20px;font-size:.75rem;font-weight:600;box-shadow:0 2px 12px rgba(0,0,0,.1);color:var(--black)}
.chat-widget__btn{width:56px;height:56px;background:var(--blue);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--white);box-shadow:0 4px 16px rgba(0,104,201,.3);transition:transform var(--transition)}
.chat-widget__btn:hover{transform:scale(1.08)}
.chat-widget__btn svg{width:24px;height:24px}

/* ---------- Burger Button ---------- */
.burger{display:none;width:40px;height:40px;position:relative;flex-direction:column;justify-content:center;align-items:center;gap:6px;z-index:1100}
.burger span{display:block;width:24px;height:2px;background:var(--black);border-radius:2px;transition:all .3s ease}
.burger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.burger.active span:nth-child(2){opacity:0}
.burger.active span:nth-child(3){transform:rotate(-45deg) translate(6px,-6px)}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  :root{--section-py:56px;--header-h:64px}
  .container{padding:0 20px}

  /* Burger visible */
  .burger{display:flex}

  /* Mobile nav overlay */
  .header__nav{
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    position:fixed;top:0;right:-100%;width:80%;max-width:320px;height:100vh;
    background:var(--white);padding:calc(var(--header-h) + 16px) 24px 32px;
    box-shadow:-4px 0 24px rgba(0,0,0,.1);transition:right .3s ease;
    overflow-y:auto;z-index:1050
  }
  .header__nav.open{right:0}
  .header__nav a,.header__nav button{font-size:.9375rem;padding:14px 0;border-bottom:1px solid var(--gray-100)}
  .header__nav .btn-contact{margin-top:16px;text-align:center;justify-content:center;border-bottom:none}

  /* Mobile dropdown - always visible */
  .nav-dropdown__menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;padding:0 0 0 16px;min-width:auto}
  .nav-dropdown__menu a{padding:10px 0;font-size:.875rem;border-bottom:1px solid var(--gray-50)}
  .nav-dropdown__trigger::after{display:none}

  /* Overlay backdrop */
  .nav-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:1040;opacity:0;visibility:hidden;transition:all .3s ease}
  .nav-overlay.active{opacity:1;visibility:visible}

  .hero__catch{font-size:2rem}
  .works-grid,.news-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .service-grid{grid-template-columns:1fr}
  .service-item:nth-child(odd){padding-right:0;border-right:none}
  .service-item:nth-child(even){padding-left:0}
  .feature-layout{grid-template-columns:1fr;gap:40px}
  .blog-layout{grid-template-columns:1fr}
  .value-cards{grid-template-columns:1fr}
  .cta-duo{grid-template-columns:1fr}
  .cta-duo__item:first-child{border-right:none;border-bottom:1px solid var(--gray-200)}
  .form-grid{grid-template-columns:1fr}
  .footer__top{flex-direction:column;gap:24px;text-align:center}
  .footer__services{flex-wrap:wrap;justify-content:center}
  .footer__bottom{flex-direction:column;align-items:center;text-align:center}
  .page-hero{padding:120px 0 48px}
  .page-hero__title{font-size:1.5rem}
  .download-cards-grid{grid-template-columns:1fr}
}