/* ===== KEY VISUAL ===== */
.kv {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(145deg, #0f2b1e 0%, #1b4332 50%, #2d6a4f 100%);
  position: relative; overflow: hidden; padding: 100px 24px 80px;
}
.kv::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse at 25% 75%, rgba(45,106,79,0.3) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.04) 0%, transparent 50%);
}
.kv-pattern {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.kv-content { position: relative; z-index: 1; max-width: 1040px; text-align: center; }
.kv-eyebrow {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: clamp(0.78rem, 1.3vw, 0.92rem);
  font-weight: 500;
  color: var(--accent-light);
  letter-spacing: 0.12em;
  margin-bottom: 20px;
}
.kv h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.8rem, 3.8vw, 2.6rem);
  font-weight: 700; color: var(--white);
  line-height: 1.5; margin-bottom: 32px; letter-spacing: 0.04em;
}
.kv-h1-nowrap { white-space: nowrap; }
.kv-br-sp { display: none; }
.kv-sub-lead {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
  font-weight: 600;
  color: var(--white);
  line-height: 1.7;
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}
.kv-sub {
  font-size: clamp(0.9rem, 1.8vw, 1.1rem); color: rgba(255,255,255,0.85);
  line-height: 2; margin-bottom: 48px; font-weight: 300;
}

/* ===== KV STICKY BAR ===== */
.kv-sticky-bar {
  display: flex;
  align-items: center;
  position: fixed;
  top: 48px;
  left: 0; right: 0;
  z-index: 998;
  height: 0;
  overflow: hidden;
  background: linear-gradient(145deg, #0f2b1e 0%, #1b4332 50%, #2d6a4f 100%);
  transition: height 0.35s ease;
}

.kv-sticky-bar.kv-sticky-visible { height: 46px; }

.kv-sticky-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }

.kv-sticky-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  letter-spacing: 0.03em;
}

@media (min-width: 1024px) {
  .kv-sticky-title { font-size: 1.0rem; }
}

/* ===== SECTIONS (top page uses 100px padding) ===== */
section { padding: 100px 24px; }

/* ===== PROBLEMS ===== */
.problems { background: var(--bg-cream); }
.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.problem-card {
  background: var(--white); padding: 36px 32px;
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  transition: all 0.3s ease;
  display: block; text-decoration: none; color: inherit; cursor: pointer;
}
.problem-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.problem-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
}
.problem-card h3 {
  font-size: 1.1rem; font-weight: 600;
  color: var(--primary-dark); margin-bottom: 12px;
}
.problem-card p { font-size: 1rem; color: var(--text-light); line-height: 1.8; }
.problem-card-link {
  font-size: 0.85rem; font-weight: 600; color: var(--accent);
  margin-top: 16px; display: inline-flex; align-items: center; gap: 6px;
}
.problem-card:hover .problem-card-link { text-decoration: underline; }

/* ===== HI MESSAGE ===== */
.hi-message-h2 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.5;
  letter-spacing: 0.04em;
  text-align: center;
  margin-bottom: 48px;
}
.hi-message-body {
  font-size: 1.02rem;
  color: var(--text);
  line-height: 2.0;
  text-align: left;
}
.hi-message-body p + p { margin-top: 24px; }
.hi-message-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 1.5em;
  margin: 2em 0;
  font-family: 'Noto Serif JP', serif;
  font-size: 1.15em;
  font-weight: 500;
  color: var(--text);
  font-style: normal;
  line-height: 1.8;
}
.hi-message-author-link {
  margin-top: 40px;
  text-align: right;
}
.hi-message-author-link a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.hi-message-author-link a:hover { text-decoration: underline; }

/* ===== ABOUT BRIEF ===== */
.about-brief { background: var(--bg-cream); }

/* ===== CONTACT ===== */
.contact-section { background: var(--white); }

/* ===== CONTACT FORM ===== */
.contact-form { max-width: 640px; margin: 0 auto; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.9rem; font-weight: 600;
  color: var(--text); margin-bottom: 6px;
}
.form-group .required {
  color: #c0392b; font-size: 0.75rem; margin-left: 4px;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border);
  border-radius: 6px; font-size: 1rem; font-family: 'Noto Sans JP', sans-serif;
  color: var(--text); background: var(--white); outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,58,92,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit {
  width: 100%; padding: 16px; background: var(--primary); color: var(--white);
  border: none; border-radius: 6px; font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: all 0.3s; font-family: 'Noto Sans JP', sans-serif;
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.form-submit:hover { background: var(--primary-light); }
.form-message {
  margin-top: 16px; padding: 12px 16px; border-radius: 6px;
  font-size: 0.95rem; display: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  section { padding: 64px 16px; }
  .kv { padding: 80px 16px 60px; min-height: auto; }
  .kv-eyebrow { letter-spacing: 0.06em; }
  .kv h1 { font-size: 1.5rem; letter-spacing: 0.02em; }
  .kv-br-sp { display: inline; }
  .problems-grid { grid-template-columns: 1fr; }
}

@media (max-width: 360px) {
  .kv h1 { font-size: 1.35rem; }
}
.about-btn-wrap { margin-top: 32px; }