/* ── Kurokane — Style ──────────────────────────────── */

:root {
  --kuro:       #0f0f0e;
  --sumi:       #1a1a18;
  --tetsu:      #2c2c28;
  --hagane:     #484842;
  --nami:       #6e6e65;
  --susu:       #a0a094;
  --kiri:       #c8c8bc;
  --washi:      #e6e2d8;
  --shiro:      #f4f2ec;
  --kinu:       #faf9f5;

  --aka:        #a33225;
  --akamute:    #c75b4f;
  --sabi:       #8b5e3c;

  --ff-display: 'Noto Serif Display', Georgia, 'Times New Roman', serif;
  --ff-body:    'DM Sans', 'Helvetica Neue', Arial, sans-serif;

  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  2rem;
  --sp-lg:  4rem;
  --sp-xl:  6rem;
  --sp-2xl: 9rem;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ── Reset ───────────────────────────────────────────── */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--ff-body);
  font-weight: 300;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--tetsu);
  background: var(--kinu);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color 0.3s var(--ease); }
ul { list-style: none; }

h1, h2, h3 {
  font-family: var(--ff-display);
  font-weight: 400;
  line-height: 1.15;
}

em { font-style: italic; font-weight: 300; }

.container {
  width: 100%;
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 var(--sp-md);
}

/* ── Button ──────────────────────────────────────────── */

.btn {
  display: inline-block;
  font-family: var(--ff-body);
  font-weight: 400;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.85rem 2.2rem;
  background: var(--sumi);
  color: var(--washi);
  border: none;
  cursor: pointer;
  transition: background 0.35s var(--ease), transform 0.25s var(--ease);
}

.btn:hover {
  background: var(--aka);
  transform: translateY(-1px);
}

/* ── Nav ─────────────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(250, 249, 245, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(15, 15, 14, 0.05);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 68rem;
  margin: 0 auto;
  padding: 1rem var(--sp-md);
}

.nav__logo {
  font-family: var(--ff-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--kuro);
  letter-spacing: 0.06em;
}

.nav__links { display: flex; gap: 2.4rem; }

.nav__links a {
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nami);
}

.nav__links a:hover { color: var(--kuro); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 7px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--kuro);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

/* ── Hero ────────────────────────────────────────────── */

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  align-items: center;
  gap: var(--sp-xl);
  max-width: 68rem;
  margin: 0 auto;
  padding: var(--sp-2xl) var(--sp-md) var(--sp-xl);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(163, 50, 37, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(139, 94, 60, 0.04) 0%, transparent 50%);
}

.hero__content { position: relative; z-index: 1; }

.hero__over {
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--nami);
  margin-bottom: var(--sp-md);
}

.hero__title {
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 300;
  color: var(--kuro);
  margin-bottom: var(--sp-md);
  letter-spacing: -0.01em;
}

.hero__rule {
  width: 3rem;
  height: 2px;
  background: var(--aka);
  margin-bottom: var(--sp-md);
}

.hero__desc {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--hagane);
  max-width: 32rem;
  margin-bottom: var(--sp-lg);
}

/* Large decorative kanji */
.hero__kanji {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  user-select: none;
}

.hero__kanji span {
  font-family: var(--ff-display);
  font-size: clamp(6rem, 14vw, 12rem);
  font-weight: 300;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--kiri);
  opacity: 0.5;
}

/* ── Section Shared ──────────────────────────────────── */

.section { padding: var(--sp-xl) 0; }

.section__label {
  display: inline-block;
  font-family: var(--ff-body);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--aka);
  margin-bottom: var(--sp-xs);
}

.section__title {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  color: var(--kuro);
  margin-bottom: var(--sp-lg);
}

.section__title em { color: var(--aka); }

/* ── Knives ──────────────────────────────────────────── */

.knives { background: var(--shiro); }

.knives__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-md);
}

.knife {
  border: 1px solid var(--washi);
  background: var(--kinu);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.knife:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 44px rgba(15, 15, 14, 0.05);
}

.knife__visual {
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--shiro);
  position: relative;
  overflow: hidden;
}

/* Abstract blade shape */
.knife__blade {
  width: var(--blade-w, 60%);
  height: var(--blade-h, 24%);
  background: linear-gradient(180deg, var(--hagane) 0%, var(--susu) 40%, var(--kiri) 100%);
  clip-path: polygon(0% 50%, 8% 0%, 100% 0%, 100% 50%, 100% 100%, 8% 100%);
  opacity: 0.5;
  transition: opacity 0.4s var(--ease);
}

.knife:hover .knife__blade { opacity: 0.7; }

.knife__info { padding: 1.3rem 1.5rem; }

.knife__type {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--aka);
  margin-bottom: 0.4rem;
}

.knife__name {
  font-size: 1.15rem;
  color: var(--kuro);
  margin-bottom: 0.4rem;
}

.knife__detail {
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--nami);
  margin-bottom: var(--sp-sm);
}

.knife__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--washi);
  padding-top: var(--sp-xs);
}

.knife__origin {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--susu);
}

.knife__price {
  font-family: var(--ff-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--kuro);
}

/* ── Makers ──────────────────────────────────────────── */

.makers { background: var(--kinu); }

.makers__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-xl);
}

.makers__text p {
  font-size: 0.98rem;
  line-height: 1.88;
  color: var(--tetsu);
  margin-bottom: var(--sp-md);
}

.makers__text p:last-child { margin-bottom: 0; }

.makers__regions {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.region {
  padding: var(--sp-sm) 0;
  border-bottom: 1px solid var(--washi);
}

.region:last-child { border-bottom: none; }

.region__name {
  font-size: 1.1rem;
  color: var(--kuro);
  margin-bottom: 0.3rem;
}

.region__desc {
  font-size: 0.86rem;
  line-height: 1.68;
  color: var(--nami);
}

/* ── Sharpening ──────────────────────────────────────── */

.sharpening {
  background: var(--sumi);
  color: var(--washi);
}

.sharpening .section__label { color: var(--akamute); }
.sharpening .section__title { color: var(--shiro); }
.sharpening .section__title em { color: var(--akamute); }

.sharp__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-md);
}

.sharp {
  padding: var(--sp-md);
  border: 1px solid rgba(230, 226, 216, 0.07);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.sharp:hover {
  border-color: rgba(230, 226, 216, 0.14);
  background: rgba(230, 226, 216, 0.03);
}

.sharp h3 {
  font-size: 1.1rem;
  color: var(--shiro);
  margin-bottom: 0.5rem;
}

.sharp p {
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(230, 226, 216, 0.55);
  margin-bottom: var(--sp-md);
}

.sharp__price {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.sharp__amount {
  font-family: var(--ff-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--shiro);
}

.sharp__unit {
  font-size: 0.76rem;
  color: var(--nami);
}

/* ── Contact ─────────────────────────────────────────── */

.contact { background: var(--washi); }

.contact__layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--sp-xl);
}

.contact__info > p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--hagane);
  margin-bottom: var(--sp-lg);
  max-width: 26rem;
}

.contact__details { display: flex; flex-direction: column; gap: var(--sp-sm); }

.contact__row {
  display: flex;
  gap: var(--sp-md);
  font-size: 0.88rem;
  line-height: 1.65;
  padding-bottom: var(--sp-sm);
  border-bottom: 1px solid var(--kiri);
}

.contact__row:last-child { border-bottom: none; padding-bottom: 0; }

.contact__lbl {
  flex-shrink: 0;
  width: 5rem;
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--susu);
  padding-top: 0.15rem;
}

/* Form */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form__group label {
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--susu);
}

.form__group input,
.form__group textarea,
.form__group select {
  font-family: var(--ff-body);
  font-size: 0.92rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--kuro);
  background: var(--kinu);
  border: 1px solid var(--kiri);
  padding: 0.75rem 0.9rem;
  transition: border-color 0.3s var(--ease);
  outline: none;
  -webkit-appearance: none;
  border-radius: 0;
}

.form__group input:focus,
.form__group textarea:focus,
.form__group select:focus {
  border-color: var(--aka);
}

.form__group textarea { resize: vertical; }

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--kiri);
  font-weight: 200;
}

.form__group select option {
  background: var(--kinu);
  color: var(--kuro);
}

.contact__form .btn { align-self: flex-start; margin-top: var(--sp-xs); }

/* ── Footer ──────────────────────────────────────────── */

.footer {
  background: var(--kuro);
  color: var(--nami);
  padding: var(--sp-lg) 0 var(--sp-md);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--sp-lg);
}

.footer__logo {
  font-family: var(--ff-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--washi);
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.footer__sub {
  font-size: 0.78rem;
  color: var(--hagane);
}

.footer__links { display: flex; gap: 2rem; }

.footer__links a {
  font-size: 0.8rem;
  color: var(--hagane);
  transition: color 0.3s var(--ease);
}

.footer__links a:hover { color: var(--washi); }

.footer__bottom {
  border-top: 1px solid rgba(230, 226, 216, 0.05);
  padding-top: var(--sp-sm);
}

.footer__bottom p {
  font-size: 0.72rem;
  color: var(--hagane);
  opacity: 0.5;
}

/* ── Reveal ──────────────────────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 64rem) {
  .knives__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 48rem) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(250, 249, 245, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: var(--sp-sm) var(--sp-md) var(--sp-md);
    gap: 0;
    border-bottom: 1px solid rgba(15, 15, 14, 0.05);
  }

  .nav__links.is-open { display: flex; }
  .nav__links li { padding: 0.55rem 0; }
  .nav__toggle { display: flex; }

  .nav__toggle.is-active span:nth-child(1) { transform: translateY(4.25px) rotate(45deg); }
  .nav__toggle.is-active span:nth-child(2) { transform: translateY(-4.25px) rotate(-45deg); }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 8rem var(--sp-md) var(--sp-lg);
    gap: var(--sp-lg);
  }

  .hero__kanji { flex-direction: row; justify-content: flex-start; }
  .hero__kanji span { font-size: 5rem; }

  .knives__grid { grid-template-columns: 1fr; }
  .makers__layout { grid-template-columns: 1fr; gap: var(--sp-lg); }
  .sharp__grid { grid-template-columns: 1fr; }
  .contact__layout { grid-template-columns: 1fr; gap: var(--sp-lg); }

  .footer__inner { flex-direction: column; gap: var(--sp-md); }
  .footer__links { flex-wrap: wrap; gap: 1.2rem; }
}