@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Noto+Sans+JP:wght@400;500;600&display=swap');

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

:root {
  --color-bg: #16161a;
  --color-surface: #222228;
  --color-border: #33333d;
  --color-text: #f5f5f5;
  --color-text-muted: #9b9ba6;
  --color-accent: #ffffff;
  --color-accent-hover: #cccccc;
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --border-radius: 12px;
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  scroll-behavior: smooth;
}

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

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

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 6%;
}

/* ========== Header / Nav ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(3, 3, 3, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 6%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.nav-logo:hover {
  opacity: 1;
}

.nav-logo-img {
  height: 32px;
  width: auto;
  display: block;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links a:hover {
  color: var(--color-accent);
}

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 60%);
  z-index: -1;
  pointer-events: none;
}

.hero-content {
  animation: fadeUp 1.2s ease-out forwards;
  opacity: 0;
  transform: translateY(20px);
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

.hero-logo {
  width: clamp(140px, 15vw, 180px);
  height: auto;
  margin: 0 auto 24px;
  display: block;
  opacity: 0.9;
  filter: drop-shadow(0 0 40px rgba(255, 255, 255, 0.15));
}

.hero-title {
  font-size: clamp(3rem, 10vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 24px;
}

.hero-reading {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.3em;
  margin-bottom: 32px;
  text-transform: uppercase;
}

.hero-concept {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  color: var(--color-text);
  line-height: 2.2;
  font-weight: 400;
  letter-spacing: 0.04em;
}

/* ========== About ========== */
.about {
  padding: 160px 0;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.section-title {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 56px;
  letter-spacing: 0.02em;
  color: var(--color-accent);
}

.about-content p {
  color: var(--color-text-muted);
  margin-bottom: 28px;
  font-size: 1.05rem;
  line-height: 2.1;
}

/* ========== CTA ========== */
.cta {
  padding: 160px 0;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.cta p {
  color: var(--color-text-muted);
  margin-bottom: 48px;
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 48px;
  background-color: var(--color-text);
  color: var(--color-bg);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 4px;
  letter-spacing: 0.06em;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn:hover {
  background-color: transparent;
  color: var(--color-text);
  border-color: rgba(255,255,255,0.4);
}

/* ========== Contact Form ========== */
.contact-section {
  padding-top: 180px;
  padding-bottom: 160px;
}

.contact-form {
  margin-top: 64px;
}

.form-group {
  margin-bottom: 40px;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-group label .required {
  color: #ff5555;
  margin-left: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 16px 0;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  transition: var(--transition);
  border-radius: 0;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-bottom-color: var(--color-accent);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-submit {
  display: inline-flex;
  padding: 18px 56px;
  background: transparent;
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: var(--transition);
}

.form-submit:hover {
  background: var(--color-text);
  color: var(--color-bg);
}

/* ========== Footer ========== */
.footer {
  padding: 64px 0;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.footer p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.04em;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav {
    height: 70px;
  }
  .nav-links {
    gap: 20px;
  }
  .nav-links a {
    font-size: 0.75rem;
  }
  .hero {
    padding: 100px 20px 60px;
  }
  .about,
  .cta,
  .contact-section {
    padding-top: 100px;
    padding-bottom: 100px;
  }
}



.form-group select option {
  background-color: var(--color-surface);
  color: var(--color-text);
}