/* ============================================================
   t-hassy.com Redesign — White × Navy B2B
   ============================================================ */

:root {
  --bg:        #ffffff;
  --bg-alt:    #f5f7fa;
  --bg-deep:   #eef1f6;
  --navy:      #0f2748;
  --navy-2:    #1c3a63;
  --navy-3:    #284b7a;
  --text:      #1a1f2e;
  --text-sub:  #5a6275;
  --border:    #e2e6ec;
  --border-strong: #c8cfd9;
  --accent:    #c9a86c;
  --accent-2:  #b08e54;
  --error:     #c0392b;

  --container: 1120px;
  --pad-x:     24px;

  --radius-s:  2px;
  --radius-m:  4px;
  --radius-l:  8px;

  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast:    160ms;
  --t-base:    220ms;
  --t-slow:    480ms;

  --shadow-sm: 0 2px 8px rgba(15, 39, 72, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 39, 72, 0.10);
  --shadow-lg: 0 16px 48px rgba(15, 39, 72, 0.14);
}

/* ──────── RESET ──────── */
* { margin: 0; padding: 0; box-sizing: border-box; }
img, picture, svg { display: block; max-width: 100%; }
button { border: 0; background: none; cursor: pointer; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Noto Sans JP', system-ui, -apple-system, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--navy); color: #fff; }

/* ──────── COMMON ──────── */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--navy);
  margin-bottom: 24px;
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-sub);
  max-width: 720px;
  margin-bottom: 56px;
  line-height: 1.85;
}

.pc-only { display: inline; }
.sp-only { display: none; }
@media (max-width: 720px) {
  .pc-only { display: none; }
  .sp-only { display: inline; }
}

/* ──────── BUTTONS ──────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-s);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  transition: all var(--t-base) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--navy);
  color: #fff;
  border: 1px solid var(--navy);
}
.btn-primary:hover {
  background: var(--navy-2);
  border-color: var(--navy-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--navy);
}
.btn-outline:hover {
  background: var(--navy);
  color: #fff;
  transform: translateY(-1px);
}

.btn-large {
  padding: 18px 48px;
  font-size: 1rem;
}

/* ──────── HEADER ──────── */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--t-base) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-en {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
}
.logo-ja {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--text-sub);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.primary-nav ul {
  display: flex;
  gap: 32px;
  align-items: center;
}
.primary-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  position: relative;
  transition: color var(--t-fast) var(--ease);
}
.primary-nav a:hover {
  color: var(--navy);
}
.primary-nav a:not(.btn)::after {
  content: '';
  position: absolute;
  inset: auto 0 -6px 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--t-base) var(--ease);
}
.primary-nav a:not(.btn):hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-cta {
  padding: 10px 22px;
  font-size: 0.875rem;
}
.primary-nav a.btn-primary,
.primary-nav a.header-cta,
.primary-nav a.btn-primary:hover {
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  z-index: 101;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  transition: all var(--t-base) var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(360px, 90vw);
    background: #fff;
    flex-direction: column;
    gap: 0;
    padding: 96px 32px 40px;
    transform: translateX(100%);
    transition: transform var(--t-slow) var(--ease);
    box-shadow: -16px 0 48px rgba(15,39,72,0.10);
  }
  .primary-nav.open { transform: translateX(0); }
  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    width: 100%;
    align-items: stretch;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
  }
  .primary-nav ul li {
    border-top: 1px solid var(--border);
  }
  .primary-nav ul a {
    display: block;
    padding: 18px 4px;
    font-size: 1rem;
  }
  .primary-nav .header-cta {
    width: 100%;
    padding: 14px;
  }
}

/* ──────── HERO ──────── */
.hero {
  position: relative;
  padding: 200px 0 140px;
  overflow: hidden;
  background: linear-gradient(180deg, #fff 0%, #fafbfd 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
}
.hero-shape-1 {
  width: 460px;
  height: 460px;
  top: -120px;
  right: -120px;
  background: radial-gradient(circle at 30% 30%, rgba(15,39,72,0.07), transparent 70%);
}
.hero-shape-2 {
  width: 320px;
  height: 320px;
  bottom: -120px;
  left: -100px;
  background: radial-gradient(circle at 70% 30%, rgba(201,168,108,0.10), transparent 70%);
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2rem, 5.2vw, 3.5rem);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: 0.005em;
  color: var(--navy);
  margin-bottom: 32px;
}

.hero-sub {
  font-size: 1.0625rem;
  line-height: 2;
  color: var(--text);
  max-width: 720px;
  margin-bottom: 44px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 56px;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.hero-chips li {
  padding: 8px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-sub);
  letter-spacing: 0.04em;
}

@media (max-width: 720px) {
  .hero { padding: 140px 0 80px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
}

/* ──────── SECTIONS BASE ──────── */
.section {
  padding: 120px 0;
  position: relative;
}
.section-about { background: var(--bg); }
.section-ai { background: var(--bg-alt); }
.section-activities { background: var(--bg); }
.section-profile { background: var(--bg-alt); }
.section-contact { background: var(--bg); }

@media (max-width: 720px) {
  .section { padding: 72px 0; }
}

/* ──────── ABOUT ──────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 880px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
}

.about-text p { margin-bottom: 20px; line-height: 2; }
.about-text p:last-child { margin-bottom: 0; }

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 28px;
  border-left: 2px solid var(--accent);
  padding-left: 32px;
}
.about-stats li {
  display: flex;
  flex-direction: column;
}
.stat-num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.1;
  letter-spacing: 0.01em;
}
.stat-num small {
  font-size: 1rem;
  font-weight: 500;
  margin-left: 4px;
  color: var(--text-sub);
}
.stat-label {
  font-size: 0.875rem;
  color: var(--text-sub);
  margin-top: 4px;
  letter-spacing: 0.05em;
}

/* ──────── AI CONSULTING ──────── */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
@media (max-width: 720px) {
  .ai-grid { grid-template-columns: 1fr; }
}

.ai-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 36px 32px 32px;
  transition: all var(--t-base) var(--ease);
  position: relative;
}
.ai-card:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.ai-num {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent-2);
  margin-bottom: 16px;
}
.ai-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 14px;
}
.ai-card p {
  font-size: 0.9375rem;
  color: var(--text-sub);
  line-height: 1.85;
  margin-bottom: 20px;
}
.ai-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--navy);
  border-bottom: 1px solid transparent;
  transition: all var(--t-fast) var(--ease);
  padding-bottom: 2px;
}
.ai-link:hover {
  border-bottom-color: var(--accent);
}
.ai-link span { transition: transform var(--t-fast) var(--ease); }
.ai-link:hover span { transform: translateX(4px); }

/* ──────── ACTIVITIES ──────── */
.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 960px) {
  .activity-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .activity-grid { grid-template-columns: 1fr; }
}

.activity-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: all var(--t-base) var(--ease);
}
.activity-card:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.activity-thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-alt);
}
.activity-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow) var(--ease);
}
.activity-card:hover .activity-thumb img {
  transform: scale(1.04);
}

.activity-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
}

.activity-body {
  padding: 24px 24px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
}
.activity-cat {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 10px;
}
.activity-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.5;
}
.activity-body p {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.85;
  margin-bottom: 18px;
  flex: 1;
}
.activity-arrow {
  align-self: flex-end;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  transition: all var(--t-base) var(--ease);
}
.activity-card:hover .activity-arrow {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
  transform: translate(2px, -2px);
}

/* ──────── PROFILE ──────── */
.profile-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 880px) {
  .profile-grid { grid-template-columns: 1fr; gap: 40px; }
}

.profile-photo {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 320px;
}
.photo-placeholder {
  aspect-ratio: 4 / 5;
  background: linear-gradient(135deg, var(--bg-deep) 0%, #fff 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-sub);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.profile-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center;
  border-radius: var(--radius-m);
  border: 1px solid var(--border);
}
.profile-caption {
  font-size: 0.875rem;
  color: var(--text-sub);
  text-align: center;
  letter-spacing: 0.04em;
}

.profile-list {
  display: grid;
  grid-template-columns: 120px 1fr;
  row-gap: 28px;
  column-gap: 32px;
}
.profile-list dt {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-2);
  padding-top: 4px;
}
.profile-list dd ul li {
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.85;
  padding-left: 16px;
  position: relative;
}
.profile-list dd ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 1px;
  background: var(--accent);
}
@media (max-width: 600px) {
  .profile-list { grid-template-columns: 1fr; row-gap: 16px; }
  .profile-list dt { padding-top: 0; margin-bottom: 4px; }
}

/* ──────── CONTACT ──────── */
.contact-form {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-row label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.04em;
}
.form-row .required {
  color: var(--error);
  font-size: 0.75rem;
  margin-left: 2px;
}
.form-row input,
.form-row select,
.form-row textarea {
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-s);
  font-size: 1rem;
  color: var(--text);
  transition: all var(--t-fast) var(--ease);
  width: 100%;
}
.form-row textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.85;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(15, 39, 72, 0.10);
}
.form-row select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='none' stroke='%230f2748' stroke-width='1.5' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}
.form-action {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.form-status {
  font-size: 0.875rem;
  color: var(--text-sub);
}
.form-status.is-success { color: #2d7a4a; }
.form-status.is-error { color: var(--error); }

/* ──────── FOOTER ──────── */
.site-footer {
  background: var(--navy);
  color: #cbd2dd;
  padding-top: 80px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}
@media (max-width: 880px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-inner { grid-template-columns: 1fr; gap: 36px; }
}

.footer-brand .footer-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
.footer-brand .footer-tagline {
  font-size: 0.875rem;
  color: #8a96a8;
  letter-spacing: 0.04em;
}

.site-footer h4 {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.site-footer ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.site-footer a {
  font-size: 0.875rem;
  color: #cbd2dd;
  transition: color var(--t-fast) var(--ease);
}
.site-footer a:hover {
  color: #fff;
}

.footer-meta li {
  font-size: 0.875rem;
  color: #cbd2dd;
}

.footer-copyright {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
}
.footer-copyright small {
  font-size: 0.75rem;
  color: #8a96a8;
  letter-spacing: 0.04em;
}

/* ──────── FLOATING CTA (mobile) ──────── */
.floating-cta {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--navy);
  color: #fff;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow: var(--shadow-lg);
  z-index: 90;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--t-base) var(--ease);
}
.floating-cta.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.floating-cta:hover {
  background: var(--navy-2);
  transform: translateY(-2px);
}
@media (min-width: 881px) {
  .floating-cta { display: none; }
}

/* ──────── ANIMATIONS ──────── */
[data-anim] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
  transition-delay: var(--anim-delay, 0ms);
}
[data-anim].is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  [data-anim] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}

/* ──────── FOCUS ──────── */
:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
  border-radius: 2px;
}