/* ===========================================================
   Algernon Works LLC (Provisional) - Corporate Site
   =========================================================== */

:root {
  --color-navy: #0f172a;
  --color-navy-light: #1e293b;
  --color-slate: #475569;
  --color-slate-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-accent: #38bdf8;

  --font-base: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --header-height: 76px;
  --container-width: 1120px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  color: var(--color-navy);
  background-color: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===========================================================
   Header
   =========================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.logo-en {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-navy);
}

.logo-jp {
  font-size: 11px;
  color: var(--color-slate);
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: 40px;
}

.site-nav a {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--color-navy);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-navy);
  transition: width 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-slate);
}

.site-nav a:hover::after {
  width: 100%;
}

.nav-toggle,
.nav-toggle-label {
  display: none;
}

/* ===========================================================
   Hero
   =========================================================== */

.hero {
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-light) 60%, #29405f 100%);
  color: #ffffff;
  padding: 140px 0 120px;
}

.hero-inner {
  max-width: 760px;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero-copy {
  font-size: clamp(28px, 4.2vw, 44px);
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin-bottom: 32px;
}

.hero-sub {
  font-size: 15px;
  line-height: 2;
  color: #cbd5e1;
  margin-bottom: 40px;
}

.hero-cta {
  display: inline-block;
  padding: 16px 40px;
  background-color: #ffffff;
  color: var(--color-navy);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.05em;
  border-radius: 2px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
}

/* ===========================================================
   Section Common
   =========================================================== */

.section {
  padding: 110px 0;
}

.section-eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-slate-light);
  text-align: center;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.section-lead {
  font-size: 15px;
  color: var(--color-slate);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

/* ===========================================================
   Services
   =========================================================== */

.services {
  background-color: var(--color-bg-soft);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.service-card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 40px 32px;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.service-card:hover {
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
  transform: translateY(-4px);
}

.service-number {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 24px;
}

.service-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
  margin-bottom: 18px;
  color: var(--color-navy);
}

.service-desc {
  font-size: 14px;
  color: var(--color-slate);
  line-height: 1.9;
}

/* ===========================================================
   Company
   =========================================================== */

.company-table {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  border-collapse: collapse;
  border-top: 1px solid var(--color-border);
}

.company-table tr {
  border-bottom: 1px solid var(--color-border);
}

.company-table th,
.company-table td {
  padding: 22px 16px;
  text-align: left;
  font-size: 14px;
  vertical-align: top;
}

.company-table th {
  width: 180px;
  color: var(--color-slate);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.company-table td {
  color: var(--color-navy);
  font-weight: 500;
}

/* ===========================================================
   Works
   =========================================================== */

.works {
  background-color: var(--color-bg-soft);
}

.works-placeholder {
  display: flex;
  justify-content: center;
}

.works-placeholder-card {
  width: 100%;
  max-width: 480px;
  padding: 64px 32px;
  text-align: center;
  border: 1px dashed var(--color-slate-light);
  border-radius: 4px;
  color: var(--color-slate-light);
  font-weight: 700;
  letter-spacing: 0.1em;
  background-color: #ffffff;
}

/* ===========================================================
   Contact
   =========================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  max-width: 960px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-navy);
}

.required {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--color-slate);
  border-radius: 2px;
  padding: 2px 6px;
  margin-left: 4px;
  vertical-align: middle;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 14px;
  font-family: inherit;
  color: var(--color-navy);
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-navy);
  background-color: #ffffff;
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.submit-btn {
  align-self: flex-start;
  padding: 15px 48px;
  background-color: var(--color-navy);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.submit-btn:hover {
  background-color: var(--color-navy-light);
  transform: translateY(-2px);
}

.contact-info {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 40px 32px;
  height: fit-content;
}

.contact-info h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-navy);
}

.contact-email {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: 0.02em;
  margin-bottom: 20px;
  word-break: break-all;
}

.contact-note {
  font-size: 13px;
  color: var(--color-slate);
  line-height: 1.9;
}

/* ===========================================================
   Footer
   =========================================================== */

.site-footer {
  background-color: var(--color-navy);
  color: #cbd5e1;
  padding: 56px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-brand .logo-en {
  color: #ffffff;
}

.footer-brand .logo-jp {
  color: var(--color-slate-light);
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  font-size: 13px;
  color: #cbd5e1;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-copyright {
  font-size: 12px;
  color: var(--color-slate-light);
  letter-spacing: 0.03em;
}

/* ===========================================================
   Responsive - Tablet
   =========================================================== */

@media (max-width: 900px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* ===========================================================
   Responsive - Mobile
   =========================================================== */

@media (max-width: 680px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 96px 0 72px;
  }

  .hero-cta {
    width: 100%;
    text-align: center;
  }

  .service-grid {
    grid-template-columns: 1fr;
  }

  .company-table th,
  .company-table td {
    display: block;
    width: 100%;
    padding: 8px 4px;
  }

  .company-table th {
    padding-top: 20px;
    color: var(--color-navy);
    font-weight: 700;
  }

  .company-table tr {
    display: block;
    padding-bottom: 4px;
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }

  /* Mobile nav */
  .nav-toggle-label {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    z-index: 1100;
  }

  .nav-toggle-label span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-navy);
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: #ffffff;
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .site-nav a {
    padding: 18px 24px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle:checked ~ .site-nav {
    max-height: 320px;
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle:checked ~ .nav-toggle-label span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}