/* ===========================
   PURA PURA BOOKS
   Minimal Monochrome Design
   =========================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --white:      #FFFFFF;
  --off-white:  #F8F8F8;
  --light-gray: #EFEFEF;
  --gray:       #D0D0D0;
  --mid-gray:   #808080;
  --dark-gray:  #333333;
  --black:      #000000;

  --font-serif: 'Georgia', 'Garamond', serif;
  --font-sans:  -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Meiryo', sans-serif;

  --max-width: 960px;
}

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

body {
  background-color: var(--white);
  color: var(--dark-gray);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ===========================
   HEADER & LOGO
   =========================== */

.site-header {
  padding: 40px 20px;
  text-align: center;
  border-bottom: 1px solid var(--light-gray);
  position: sticky;
  top: 0;
  background: var(--white);
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.logo-circle {
  width: 80px;
  height: 80px;
  border: 2px solid var(--dark-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.logo-book {
  width: 40px;
  height: 30px;
  border: 1.5px solid var(--dark-gray);
  border-radius: 2px;
  position: relative;
}

.logo-book::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--dark-gray);
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.15em;
  color: var(--dark-gray);
  text-transform: uppercase;
  font-weight: normal;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 40px;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--dark-gray);
  transition: opacity 0.3s;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.site-nav a:hover {
  opacity: 0.6;
}

/* ===========================
   HERO
   =========================== */

.hero {
  padding: 80px 20px;
  text-align: center;
  border-bottom: 1px solid var(--light-gray);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-subtitle {
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--mid-gray);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: normal;
  line-height: 1.4;
  color: var(--black);
  margin-bottom: 24px;
}

.hero-logo-box {
  background: var(--black);
  color: var(--white);
  padding: 40px 60px;
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: normal;
  letter-spacing: 0.2em;
  margin: 20px 0;
}

.hero-desc {
  font-size: 15px;
  color: var(--mid-gray);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===========================
   SECTION
   =========================== */

.section {
  padding: 80px 20px;
  border-bottom: 1px solid var(--light-gray);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--mid-gray);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: normal;
  color: var(--black);
  margin-bottom: 32px;
  line-height: 1.5;
}

.section-text {
  font-size: 15px;
  color: var(--mid-gray);
  line-height: 1.9;
  margin-bottom: 20px;
}

/* ===========================
   GRID LAYOUTS
   =========================== */

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.three-column {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

/* ===========================
   CARDS / ITEMS
   =========================== */

.card {
  padding: 32px 0;
  border-top: 1px solid var(--light-gray);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: normal;
  color: var(--black);
  margin-bottom: 12px;
}

.card-text {
  font-size: 14px;
  color: var(--mid-gray);
  line-height: 1.8;
}

.card-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ===========================
   BUTTONS
   =========================== */

.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--dark-gray);
  background: transparent;
  color: var(--dark-gray);
  cursor: pointer;
  transition: all 0.3s;
}

.btn:hover {
  background: var(--dark-gray);
  color: var(--white);
}

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

.btn-black:hover {
  background: var(--white);
  color: var(--black);
}

/* ===========================
   DIVIDER
   =========================== */

.divider {
  width: 40px;
  height: 1px;
  background: var(--gray);
  margin: 32px auto;
}

/* ===========================
   FOOTER
   =========================== */

.site-footer {
  padding: 60px 20px;
  background: var(--off-white);
  border-top: 1px solid var(--light-gray);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  text-align: left;
}

.footer-section {
  font-size: 13px;
  line-height: 2;
  color: var(--mid-gray);
}

.footer-title {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--black);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.footer-link {
  color: var(--mid-gray);
  border-bottom: 1px solid transparent;
  transition: opacity 0.3s;
}

.footer-link:hover {
  opacity: 0.6;
}

/* ===========================
   RESPONSIVE
   =========================== */

@media (max-width: 768px) {
  .site-nav {
    gap: 24px;
    font-size: 12px;
  }

  .hero {
    padding: 60px 20px;
  }

  .hero-title {
    font-size: clamp(1.6rem, 4vw, 2.5rem);
  }

  .section {
    padding: 60px 20px;
  }

  .two-column {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .three-column {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .logo-circle {
    width: 60px;
    height: 60px;
  }

  .site-nav {
    gap: 16px;
    font-size: 11px;
  }

  .hero {
    padding: 40px 20px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .section {
    padding: 40px 20px;
  }

  .section-title {
    font-size: 22px;
  }

  .hero-desc,
  .section-text,
  .card-text {
    font-size: 14px;
  }
}