/* Construction Robotics - Design System */
:root {
  --color-primary: #0A1628;
  --color-primary-light: #1a2744;
  --color-accent: #2563EB;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: rgba(37, 99, 235, 0.1);
  --color-text: #1a1a2e;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-bg: #FFFFFF;
  --color-bg-alt: #f8fafc;
  --gradient-hero: linear-gradient(135deg, #0A1628 0%, #1a2744 50%, #0f172a 100%);
  --font-primary: 'Inter', 'Noto Sans JP', sans-serif;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
  --transition: 250ms ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-primary); font-size: 1rem; line-height: 1.7; color: var(--color-text); background: var(--color-bg); }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 6rem 0; }
.section--dark { background: var(--color-primary); color: #fff; }
.section--alt { background: var(--color-bg-alt); }

/* Header */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 1rem 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); border-bottom: 1px solid var(--color-border); }
.header__inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 0.75rem; font-size: 1.125rem; font-weight: 700; }
.logo__icon { width: 40px; height: 40px; background: linear-gradient(135deg, #2563EB, #1d4ed8); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.875rem; }
.nav { display: flex; align-items: center; gap: 2rem; }
.nav__list { display: flex; align-items: center; gap: 1.5rem; }
.nav__link { font-size: 0.875rem; font-weight: 500; color: var(--color-text-muted); transition: color var(--transition); }
.nav__link:hover { color: var(--color-text); }
.nav__cta { padding: 0.5rem 1.25rem; background: var(--color-primary); color: #fff; border-radius: var(--radius-md); font-size: 0.875rem; font-weight: 500; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 0.5rem; }
.menu-toggle span { width: 24px; height: 2px; background: var(--color-text); }
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav__list { position: fixed; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 1.5rem; gap: 1rem; border-bottom: 1px solid var(--color-border); transform: translateY(-100%); opacity: 0; visibility: hidden; transition: all var(--transition); }
  .nav__list.active { transform: translateY(0); opacity: 1; visibility: visible; }
}

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 1rem 2rem; font-size: 1rem; font-weight: 600; border-radius: var(--radius-lg); transition: all var(--transition); }
.btn--primary { background: var(--color-accent); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.25); }
.btn--primary:hover { background: var(--color-accent-hover); transform: translateY(-2px); }
.btn--white { background: #fff; color: var(--color-primary); }
.btn--outline-white { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.3); }
.btn--outline-white:hover { background: rgba(255,255,255,0.1); }

/* Hero */
.hero { min-height: 100vh; display: flex; align-items: center; background: var(--gradient-hero); color: #fff; position: relative; overflow: hidden; padding-top: 80px; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 20% 80%, rgba(37,99,235,0.15) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(37,99,235,0.1) 0%, transparent 50%); }
.hero__content { max-width: 700px; position: relative; z-index: 1; }
.hero__badge { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; background: rgba(37,99,235,0.2); border: 1px solid rgba(37,99,235,0.3); border-radius: 9999px; font-size: 0.875rem; color: #93c5fd; margin-bottom: 1.5rem; }
.hero__badge-dot { width: 6px; height: 6px; background: #22c55e; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero__title { font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.03em; }
.hero__subtitle { font-size: 1.25rem; color: #cbd5e1; margin-bottom: 2rem; line-height: 1.6; }
.hero__buttons { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Cards */
.card { background: #fff; border-radius: var(--radius-xl); border: 1px solid var(--color-border); padding: 2rem; transition: all var(--transition); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card__icon { width: 48px; height: 48px; background: #fef2f2; border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; margin-bottom: 1.25rem; font-size: 1.25rem; }
.card__title { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.75rem; }
.card__text { color: var(--color-text-muted); font-size: 0.875rem; margin: 0; }

/* Grid */
.grid { display: grid; gap: 1.5rem; }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 768px) { .grid--2 { grid-template-columns: 1fr; } }

/* Solution Box */
.solution-box { background: var(--color-primary); color: #fff; padding: 3rem; border-radius: var(--radius-2xl); position: relative; overflow: hidden; }
.solution-box::before { content: ''; position: absolute; top: 0; right: 0; width: 400px; height: 400px; background: radial-gradient(circle, rgba(37,99,235,0.3) 0%, transparent 70%); }
.solution-box__content { position: relative; z-index: 1; }
.solution-box__label { font-size: 0.875rem; font-weight: 600; color: #93c5fd; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1rem; }
.solution-box__title { font-size: 1.875rem; margin-bottom: 1.5rem; }
.solution-box__text { font-size: 1.125rem; color: #cbd5e1; max-width: 700px; margin-bottom: 2rem; }
.solution-box__features { display: flex; flex-wrap: wrap; gap: 1rem; }
.solution-box__feature { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; background: rgba(255,255,255,0.1); border-radius: 9999px; font-size: 0.875rem; }

/* Section Headers */
.section-header { text-align: center; max-width: 700px; margin: 0 auto 4rem; }
.section-label { display: inline-block; font-size: 0.875rem; font-weight: 600; color: var(--color-accent); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1rem; }
.section-lead { color: var(--color-text-muted); font-size: 1.125rem; }

/* Service Cards */
.service-card { background: #fff; border-radius: var(--radius-2xl); border: 1px solid var(--color-border); overflow: hidden; transition: all var(--transition); }
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.service-card__image { height: 200px; background: linear-gradient(135deg, #1e3a5f, #0A1628); display: flex; align-items: center; justify-content: center; position: relative; }
.service-card__image-icon { font-size: 4rem; opacity: 0.3; }
.service-card__number { position: absolute; top: 1rem; left: 1rem; font-size: 0.875rem; font-weight: 700; color: #fff; background: rgba(37,99,235,0.8); padding: 0.25rem 0.75rem; border-radius: var(--radius-md); }
.service-card__content { padding: 2rem; }
.service-card__title { font-size: 1.25rem; margin-bottom: 1rem; }
.service-card__text { color: var(--color-text-muted); font-size: 0.875rem; line-height: 1.7; margin-bottom: 1.5rem; }
.service-card__tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.service-card__tag { font-size: 0.75rem; font-weight: 500; color: var(--color-accent); background: var(--color-accent-light); padding: 0.25rem 0.75rem; border-radius: 9999px; }
.service-card--full { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; }
.service-card--full .service-card__image { height: 100%; min-height: 200px; }
@media (max-width: 768px) { .service-card--full { grid-template-columns: 1fr; } }

/* Tech Features */
.tech-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.5rem; }
.tech-feature { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem; background: var(--color-bg-alt); border-radius: var(--radius-lg); }
.tech-feature__icon { width: 32px; height: 32px; background: var(--color-accent); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.875rem; }
.tech-feature__text { font-size: 0.875rem; font-weight: 500; }
@media (max-width: 768px) { .tech-features { grid-template-columns: 1fr; } }

/* Reason Cards */
.reason-card { text-align: center; padding: 2rem; }
.reason-card__number { width: 56px; height: 56px; background: linear-gradient(135deg, #2563EB, #1d4ed8); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1.25rem; font-weight: 700; margin: 0 auto 1.5rem; }
.reason-card__title { font-size: 1.25rem; margin-bottom: 1rem; }
.reason-card__text { color: var(--color-text-muted); font-size: 0.875rem; margin: 0; }

/* Company */
.company-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
@media (max-width: 768px) { .company-grid { grid-template-columns: 1fr; } }
.company-table { width: 100%; border-collapse: collapse; }
.company-table tr { border-bottom: 1px solid var(--color-border); }
.company-table th, .company-table td { padding: 1rem 0; text-align: left; font-size: 0.875rem; }
.company-table th { width: 120px; font-weight: 600; color: var(--color-text-muted); }
.company-note { margin-top: 2rem; padding: 1.5rem; background: var(--color-bg-alt); border-radius: var(--radius-xl); border-left: 4px solid var(--color-accent); }
.company-note__title { font-size: 0.875rem; font-weight: 600; color: var(--color-accent); margin-bottom: 0.5rem; }
.company-note__text { font-size: 0.875rem; color: var(--color-text-muted); margin: 0; }
.company-visual { background: var(--gradient-hero); border-radius: var(--radius-2xl); padding: 3rem; color: #fff; position: relative; overflow: hidden; }
.company-visual::before { content: ''; position: absolute; top: -50%; right: -50%; width: 100%; height: 100%; background: radial-gradient(circle, rgba(37,99,235,0.2) 0%, transparent 70%); }
.company-visual__content { position: relative; z-index: 1; }
.company-visual__title { font-size: 1.5rem; margin-bottom: 1rem; }
.company-visual__text { color: #cbd5e1; margin-bottom: 1.5rem; }

/* CTA */
.cta { background: var(--gradient-hero); color: #fff; text-align: center; position: relative; overflow: hidden; }
.cta::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 30% 70%, rgba(37,99,235,0.2) 0%, transparent 50%), radial-gradient(circle at 70% 30%, rgba(37,99,235,0.15) 0%, transparent 50%); }
.cta__content { position: relative; z-index: 1; max-width: 600px; margin: 0 auto; }
.cta__title { font-size: 2.25rem; margin-bottom: 1.5rem; }
.cta__text { font-size: 1.125rem; color: #cbd5e1; margin-bottom: 2rem; }
.cta__buttons { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* Footer */
.footer { background: var(--color-primary); color: #fff; padding: 4rem 0 2rem; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
@media (max-width: 768px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer__grid { grid-template-columns: 1fr; } }
.footer__logo { display: flex; align-items: center; gap: 0.75rem; font-size: 1.125rem; font-weight: 700; margin-bottom: 1rem; }
.footer__logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, #2563EB, #1d4ed8); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 0.75rem; }
.footer__address { font-size: 0.875rem; color: #94a3b8; font-style: normal; line-height: 1.8; }
.footer__nav-title { font-size: 0.875rem; font-weight: 600; margin-bottom: 1rem; }
.footer__nav-list { display: flex; flex-direction: column; gap: 0.75rem; }
.footer__nav-link { font-size: 0.875rem; color: #94a3b8; transition: color var(--transition); }
.footer__nav-link:hover { color: #fff; }
.footer__bottom { padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.1); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer__copyright { font-size: 0.875rem; color: #64748b; }
.footer__legal { display: flex; gap: 1.5rem; }
.footer__legal-link { font-size: 0.875rem; color: #64748b; }
.footer__legal-link:hover { color: #fff; }

/* Page Header */
.page-header { background: var(--gradient-hero); color: #fff; padding: calc(80px + 4rem) 0 4rem; text-align: center; }
.page-header__title { font-size: 2.25rem; margin-bottom: 1rem; }
.page-header__subtitle { color: #cbd5e1; font-size: 1.125rem; }
.page-content { padding: 4rem 0; }

/* Forms */
.contact-form { max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: 1.5rem; }
.form-label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.5rem; }
.form-label--required::after { content: '*'; color: #ef4444; margin-left: 0.25rem; }
.form-input, .form-textarea, .form-select { width: 100%; padding: 1rem; font-size: 1rem; font-family: inherit; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: #fff; transition: all var(--transition); }
.form-input:focus, .form-textarea:focus, .form-select:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-textarea { min-height: 150px; resize: vertical; }
.form-submit { width: 100%; margin-top: 1rem; }

/* Legal Pages */
.legal-content { max-width: 800px; margin: 0 auto; }
.legal-content h2 { font-size: 1.5rem; margin-top: 3rem; margin-bottom: 1.5rem; }
.legal-content h3 { font-size: 1.25rem; margin-top: 2rem; margin-bottom: 1rem; }
.legal-content p { margin-bottom: 1rem; color: var(--color-text-muted); }
.legal-content ul { margin-bottom: 1rem; padding-left: 1.5rem; }
.legal-content li { list-style: disc; margin-bottom: 0.5rem; color: var(--color-text-muted); }
.legal-table { width: 100%; border-collapse: collapse; margin-bottom: 2rem; }
.legal-table th, .legal-table td { padding: 1rem; border: 1px solid var(--color-border); text-align: left; }
.legal-table th { background: var(--color-bg-alt); font-weight: 600; width: 200px; }

/* Recruit */
.job-card { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: 2rem; margin-bottom: 1.5rem; transition: all var(--transition); }
.job-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.job-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1rem; }
.job-card__title { font-size: 1.25rem; font-weight: 700; }
.job-card__badge { font-size: 0.75rem; font-weight: 600; color: #fff; background: var(--color-accent); padding: 0.25rem 0.75rem; border-radius: 9999px; }
.job-card__table { width: 100%; margin-bottom: 1.5rem; }
.job-card__table tr { border-bottom: 1px solid var(--color-border); }
.job-card__table th, .job-card__table td { padding: 0.75rem 0; font-size: 0.875rem; text-align: left; }
.job-card__table th { width: 100px; color: var(--color-text-muted); font-weight: 500; }

/* Utilities */
.text-center { text-align: center; }
.mt-16 { margin-top: 4rem; }
.mb-16 { margin-bottom: 4rem; }