/* ========================================
   K Design Studio - Portfolio
   ======================================== */

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

:root {
  --color-bg: #0a0a0f;
  --color-surface: #12121a;
  --color-surface-alt: #0e0e16;
  --color-border: #1e1e2e;
  --color-text: #e4e4ef;
  --color-text-muted: #8888a0;
  --color-primary: #6366f1;
  --color-primary-hover: #818cf8;
  --color-accent: #a78bfa;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }

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

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 640px; }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-full { width: 100%; }

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--color-text); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--color-text); }

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
}
.nav-cta:hover {
  background: var(--color-primary-hover);
  color: #fff !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(167, 139, 250, 0.06) 0%, transparent 50%);
}

.hero-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Sections --- */
.section {
  padding: 100px 0;
}

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

.section-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
}

/* --- Pain Points --- */
.pain-list {
  max-width: 640px;
  margin: 0 auto 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pain-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
}

.pain-icon {
  color: #f87171;
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
}

.pain-item p {
  font-size: 0.95rem;
  color: var(--color-text);
}

.pain-answer {
  text-align: center;
  font-size: 1.1rem;
  color: var(--color-text);
  margin-top: 8px;
}
.pain-answer strong {
  color: var(--color-primary);
}

/* --- Cards (Services) --- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all var(--transition);
}
.card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.1);
}

.card-icon {
  color: var(--color-primary);
  margin-bottom: 20px;
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- Works --- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}

.work-item {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.work-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
}

.work-thumb {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.placeholder-thumb {
  background: linear-gradient(135deg, var(--color-surface) 0%, #1a1a2e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.placeholder-thumb span {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.work-info {
  padding: 20px 24px;
}
.work-info h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.work-info p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.works-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* --- Pricing --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
}
.pricing-card:hover {
  transform: translateY(-4px);
}

.pricing-card-featured {
  border-color: var(--color-primary);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.12);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
}

.pricing-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.pricing-price .yen { font-size: 1.2rem; vertical-align: top; }
.pricing-price .tax {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 28px;
}
.pricing-features li {
  font-size: 0.9rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  padding-left: 20px;
  position: relative;
}
.pricing-features li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* --- Contact --- */
.contact-lead {
  color: var(--color-text-muted);
  margin-bottom: 36px;
  text-align: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea { resize: vertical; }

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.footer-logo {
  font-weight: 700;
  font-size: 1rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}
.footer-links a:hover { color: var(--color-text); }

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* --- Mobile --- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: 32px 24px;
    gap: 24px;
    z-index: 99;
  }
  .nav-links.active a {
    font-size: 1.1rem;
    color: var(--color-text);
  }
  .nav-toggle { display: flex; }

  .hero { min-height: auto; padding: 120px 0 60px; }
  .hero-title { font-size: 2rem; }

  .section { padding: 64px 0; }
  .section-subtitle { font-size: 1.4rem; margin-bottom: 32px; }

  .hero-actions { flex-direction: column; }
  .hero-actions .btn { text-align: center; }

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

  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}