/* ===================================
   Sensiphia Corporate LP
   style.css
=================================== */

/* --- CSS Variables --- */
:root {
  --color-primary: #1a1a2e;
  --color-accent: #4f46e5;
  --color-accent-light: #6366f1;
  --color-accent-bg: #eef2ff;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;
  --color-white: #ffffff;

  --font-sans: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.12);

  --transition: 0.25s ease;
  --container-max: 1120px;
  --container-pad: clamp(1rem, 5vw, 3rem);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-pad);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  border-radius: 100px;
  font-size: .95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  letter-spacing: .02em;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79,70,229,.35);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,.6);
}

.btn-secondary:hover {
  background: rgba(255,255,255,.15);
  border-color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent-bg);
}

.btn-large {
  padding: 1rem 3rem;
  font-size: 1rem;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
  padding-block: 1.25rem;
}

.header.scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding-block: .9rem;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

/* --- Logo image ---
   現在は白背景PNGを使用（暫定）。
   SVG版（透過）が用意でき次第、.logo-img のpaddingとborder-radius を削除する。
*/
.logo-img {
  height: 36px;
  width: auto;
  display: block;
  /* 白背景PNGをダーク背景で使うため、ピル型の白背景を付与 */
  background: rgba(255, 255, 255, 0.92);
  padding: 4px 10px;
  border-radius: 6px;
  transition: background var(--transition), box-shadow var(--transition);
}

/* スクロール後（白背景ヘッダー）: 背景不要 */
.header.scrolled .logo-img {
  background: transparent;
  padding: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: .9rem;
  font-weight: 500;
  color: rgba(255,255,255,.85);
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent-light);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav-link:hover {
  color: var(--color-white);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.header.scrolled .nav-link {
  color: var(--color-text-secondary);
}

.header.scrolled .nav-link:hover {
  color: var(--color-text);
}

.btn-contact {
  background: var(--color-accent);
  color: var(--color-white) !important;
  padding: .55rem 1.25rem;
  border-radius: 100px;
  font-size: .88rem;
  transition: all var(--transition) !important;
}

.btn-contact::after {
  display: none;
}

.btn-contact:hover {
  background: var(--color-accent-light) !important;
  transform: translateY(-1px);
}

/* --- Language Switcher --- */
.lang-switch {
  display: flex;
  align-items: center;
  gap: .35rem;
  margin-left: 1.25rem;
}

.lang-link {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: rgba(255,255,255,.5);
  transition: color var(--transition);
}

.lang-link:hover {
  color: var(--color-white);
}

.lang-link--active {
  color: var(--color-white);
}

.lang-divider {
  font-size: .75rem;
  color: rgba(255,255,255,.3);
}

.header.scrolled .lang-link {
  color: var(--color-text-secondary);
}

.header.scrolled .lang-link:hover {
  color: var(--color-text);
}

.header.scrolled .lang-link--active {
  color: var(--color-accent);
}

.header.scrolled .lang-divider {
  color: var(--color-border);
}

/* --- English font override --- */
.lang-en body,
.lang-en {
  font-family: var(--font-en);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

.header.scrolled .nav-toggle span {
  background: var(--color-text);
}

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

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

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

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--color-white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0f0c29 0%, #1a1a4e 40%, #24243e 70%, #0f3460 100%);
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(79,70,229,.3) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(99,102,241,.2) 0%, transparent 60%);
}

.hero .container {
  position: relative;
  z-index: 1;
  padding-block: 10rem 6rem;
}

.hero-content {
  max-width: 720px;
}

.hero-tagline {
  font-size: .8rem;
  letter-spacing: .25em;
  color: rgba(255,255,255,.5);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1.5rem;
  letter-spacing: -.01em;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(255,255,255,.75);
  margin-bottom: 2.5rem;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.br-desktop {
  display: inline;
}

/* --- Section Common --- */
.section {
  padding-block: clamp(4rem, 10vw, 7rem);
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.section-label {
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: .75rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 1rem;
}

.section-description {
  color: var(--color-text-secondary);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.9;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-lead {
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.9;
  color: var(--color-text);
}

.about-text p {
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.about-table {
  width: 100%;
  border-collapse: collapse;
}

.about-table th,
.about-table td {
  padding: .9rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-size: .9rem;
  line-height: 1.7;
  text-align: left;
  vertical-align: top;
}

.about-table th {
  color: var(--color-text-secondary);
  font-weight: 500;
  white-space: nowrap;
  width: 7rem;
}

.about-table td {
  color: var(--color-text);
}

/* --- Services --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  width: 52px;
  height: 52px;
  background: var(--color-accent-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-accent);
}

.service-icon svg {
  width: 26px;
  height: 26px;
}

.service-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: .75rem;
  letter-spacing: -.01em;
}

.service-description {
  font-size: .9rem;
  color: var(--color-text-secondary);
  line-height: 1.85;
}

/* --- News --- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
  margin-bottom: 2.5rem;
}

.news-item {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.news-item:hover {
  background: var(--color-bg-alt);
  padding-inline: .75rem;
  margin-inline: -.75rem;
  border-radius: var(--radius-sm);
}

.news-date {
  font-size: .85rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.news-category {
  font-size: .75rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-bg);
  padding: .2rem .7rem;
  border-radius: 100px;
  white-space: nowrap;
}

.news-title {
  font-size: .95rem;
  color: var(--color-text);
  flex: 1;
  transition: color var(--transition);
}

.news-title:hover {
  color: var(--color-accent);
}

.news-more {
  text-align: center;
}

/* --- Contact --- */
.section-contact {
  background: var(--color-bg-alt);
}

.contact-form {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: .45rem;
}

.form-group label {
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: .4rem;
}

.required-badge {
  font-size: .7rem;
  background: var(--color-accent);
  color: white;
  padding: .15rem .45rem;
  border-radius: 4px;
  font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: .75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: auto;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(79,70,229,.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #b0b7c3;
}

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

.form-privacy {
  margin-top: .25rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: .6rem;
  cursor: pointer;
  font-size: .9rem;
  color: var(--color-text-secondary);
}

.checkbox-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-accent);
  cursor: pointer;
  flex-shrink: 0;
}

.link {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.form-submit {
  text-align: center;
  margin-top: .5rem;
}

.form-notice {
  text-align: center;
  font-size: .9rem;
  min-height: 1.5rem;
}

.form-notice.success {
  color: #059669;
}

.form-notice.error {
  color: #dc2626;
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,.7);
  padding-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-logo-img {
  height: 32px;
  width: auto;
  margin-bottom: .75rem;
  /* 白背景PNGをダーク背景フッターで使うため、ピル型の白背景を付与 */
  background: rgba(255, 255, 255, 0.92);
  padding: 4px 10px;
  border-radius: 6px;
}

.footer-tagline {
  font-size: .875rem;
  line-height: 1.7;
}

.footer-nav h4 {
  color: var(--color-white);
  font-size: .8rem;
  letter-spacing: .15em;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.footer-nav a {
  font-size: .875rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-block: 1.5rem;
  font-size: .8rem;
  text-align: center;
  color: rgba(255,255,255,.4);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .services-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(15,12,41,.97);
    backdrop-filter: blur(10px);
    padding: 1.5rem var(--container-pad) 2rem;
  }

  .header.scrolled .nav {
    background: rgba(255,255,255,.97);
  }

  .nav.open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }

  .nav-link {
    display: block;
    padding: .6rem 0;
    font-size: 1rem;
    width: 100%;
  }

  .btn-contact {
    margin-top: .5rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-item {
    flex-wrap: wrap;
    gap: .5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .br-desktop {
    display: none;
  }
}

@media (max-width: 480px) {
  .services-grid {
    max-width: 100%;
  }
}

/* --- Scroll Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}