/* =======================================
   芋蔵 — Design System & Styles
   ======================================= */

/* ----- Design Tokens ----- */
:root {
  /* Colors */
  --color-amber:      #C17B2F;
  --color-amber-dark: #9A6024;
  --color-amber-light:#E8B86D;
  --color-crimson:    #8B2500;
  --color-cream:      #FFF8E7;
  --color-cream-dark: #F5EDDA;
  --color-ink:        #2C2421;
  --color-ink-light:  #5A4E49;
  --color-warm-gray:  #A89B93;
  --color-white:      #FEFEFE;
  --color-gold:       #D4A853;
  --color-gold-light: #F0D48A;
  --color-bg-alt:     #FAF5EC;

  /* Typography */
  --font-serif:  'Noto Serif JP', serif;
  --font-sans:   'Noto Sans JP', sans-serif;

  /* Spacing */
  --section-py: clamp(80px, 10vw, 140px);
  --container-px: clamp(20px, 5vw, 60px);
  --container-max: 1200px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.6s;

  /* Radius */
  --radius: 12px;
  --radius-sm: 8px;
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--color-ink);
  background: var(--color-cream);
  line-height: 1.8;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s var(--ease-out);
}

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

ul { list-style: none; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ----- Fade-in Animation ----- */
.fade-in {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
}

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

/* =========================================
   HEADER
   ========================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: background 0.4s var(--ease-out),
              padding 0.4s var(--ease-out),
              box-shadow 0.4s var(--ease-out);
}

.site-header.scrolled {
  background: rgba(44, 36, 33, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  line-height: 1;
}

.logo-kanji {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--color-cream);
  letter-spacing: 0.15em;
}

.logo-sub {
  font-family: var(--font-sans);
  font-size: 0.55rem;
  font-weight: 300;
  letter-spacing: 0.35em;
  color: var(--color-gold-light);
  text-transform: uppercase;
}

.main-nav ul {
  display: flex;
  gap: 32px;
}

.main-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-cream);
  letter-spacing: 0.05em;
  position: relative;
  padding-bottom: 4px;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-gold);
  transition: width 0.3s var(--ease-out);
}

.main-nav a:hover::after {
  width: 100%;
}

.header-cta {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-ink);
  background: var(--color-gold);
  padding: 8px 24px;
  border-radius: 100px;
  letter-spacing: 0.05em;
  transition: background 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.header-cta:hover {
  background: var(--color-gold-light);
  transform: translateY(-2px);
}

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-cream);
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================
   HERO
   ========================================= */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('images/hero.png') center center / cover no-repeat;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(44, 36, 33, 0.75) 0%,
    rgba(44, 36, 33, 0.45) 50%,
    rgba(139, 37, 0, 0.3) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-cream);
  padding: 0 20px;
}

.hero-tagline {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 300;
  letter-spacing: 0.4em;
  color: var(--color-gold-light);
  margin-bottom: 24px;
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 24px;
}

.hero-title-line {
  display: block;
  font-size: clamp(2rem, 5vw, 3.8rem);
}

.hero-description {
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  font-weight: 300;
  line-height: 2;
  color: rgba(255, 248, 231, 0.85);
  margin-bottom: 40px;
}

.hero-btn {
  font-size: 1rem;
  padding: 16px 48px;
}

/* Scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
}

.hero-scroll-indicator span {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-gold-light);
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-gold);
  animation: scrollLine 2s var(--ease-out) infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* =========================================
   BUTTONS
   ========================================= */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 500;
  text-align: center;
  border: none;
  cursor: pointer;
  border-radius: 100px;
  letter-spacing: 0.08em;
  transition: all 0.35s var(--ease-out);
}

.btn-primary {
  color: var(--color-cream);
  background: linear-gradient(135deg, var(--color-amber), var(--color-crimson));
  padding: 14px 40px;
  font-size: 0.9rem;
  box-shadow: 0 4px 20px rgba(193, 123, 47, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(193, 123, 47, 0.5);
}

.btn-outline {
  color: var(--color-amber);
  background: transparent;
  border: 1.5px solid var(--color-amber);
  padding: 10px 32px;
  font-size: 0.85rem;
}

.btn-outline:hover {
  color: var(--color-cream);
  background: var(--color-amber);
  transform: translateY(-2px);
}

/* =========================================
   SECTION HEADERS
   ========================================= */
.section {
  padding: var(--section-py) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--color-warm-gray);
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.05em;
}

.section-title .accent {
  color: var(--color-amber);
}

.section-divider {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-amber), var(--color-gold-light));
  margin: 20px auto 0;
  border-radius: 2px;
}

/* =========================================
   KODAWARI (こだわり)
   ========================================= */
.kodawari-section {
  background: var(--color-cream);
}

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

.kodawari-card {
  text-align: center;
  padding: 48px 32px;
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid rgba(193, 123, 47, 0.1);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.kodawari-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(44, 36, 33, 0.08);
}

.kodawari-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  color: var(--color-amber);
}

.kodawari-icon svg {
  width: 100%;
  height: 100%;
}

.kodawari-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.kodawari-text {
  font-size: 0.9rem;
  color: var(--color-ink-light);
  line-height: 1.9;
}

/* =========================================
   PRODUCTS
   ========================================= */
.products-section {
  background: var(--color-bg-alt);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(193, 123, 47, 0.08);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(44, 36, 33, 0.1);
}

.product-image-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--color-cream-dark);
}

.product-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}

.product-card:hover .product-image-wrap img {
  transform: scale(1.05);
}

.product-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--color-crimson);
  color: var(--color-cream);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
  letter-spacing: 0.05em;
}

.product-badge.new {
  background: var(--color-amber);
}

.product-badge.gift {
  background: linear-gradient(135deg, var(--color-gold), var(--color-amber));
}

.product-info {
  padding: 28px 28px 32px;
}

.product-name {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.product-desc {
  font-size: 0.85rem;
  color: var(--color-ink-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.product-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(193, 123, 47, 0.12);
}

.product-weight {
  font-size: 0.8rem;
  color: var(--color-warm-gray);
}

.product-price {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-crimson);
}

.product-price small {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-warm-gray);
}

.product-info .btn-outline {
  width: 100%;
}

/* =========================================
   REVIEWS
   ========================================= */
.reviews-section {
  background: var(--color-ink);
  color: var(--color-cream);
}

.reviews-section .section-title {
  color: var(--color-cream);
}

.reviews-section .section-label {
  color: var(--color-warm-gray);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.review-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(212, 168, 83, 0.15);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: transform 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 168, 83, 0.35);
}

.review-stars {
  color: var(--color-gold);
  font-size: 1rem;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.review-text {
  font-size: 0.9rem;
  line-height: 2;
  color: rgba(255, 248, 231, 0.8);
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-name {
  font-weight: 500;
  font-size: 0.85rem;
}

.review-location {
  font-size: 0.75rem;
  color: var(--color-warm-gray);
}

/* =========================================
   HOW TO ORDER
   ========================================= */
.howto-section {
  background: var(--color-cream);
}

.howto-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  margin-bottom: 60px;
}

.howto-step {
  flex: 1;
  max-width: 280px;
  text-align: center;
  padding: 0 20px;
}

.step-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-amber), var(--color-gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 20px;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.85rem;
  color: var(--color-ink-light);
  line-height: 1.8;
}

.howto-connector {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-amber), var(--color-gold-light));
  margin-top: 32px;
  flex-shrink: 0;
  border-radius: 2px;
}

.howto-cta {
  text-align: center;
}

.howto-note {
  font-size: 0.8rem;
  color: var(--color-warm-gray);
  margin-bottom: 24px;
}

/* =========================================
   ABOUT
   ========================================= */
.about-section {
  background: var(--color-bg-alt);
}

.about-content {
  max-width: 700px;
  margin: 0 auto;
}

.about-table {
  width: 100%;
  border-collapse: collapse;
}

.about-table tr {
  border-bottom: 1px solid rgba(193, 123, 47, 0.12);
}

.about-table th,
.about-table td {
  padding: 18px 16px;
  text-align: left;
  font-size: 0.9rem;
  vertical-align: top;
}

.about-table th {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-ink);
  width: 120px;
  white-space: nowrap;
}

.about-table td {
  color: var(--color-ink-light);
}

.about-table td a {
  color: var(--color-amber);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-table td a:hover {
  color: var(--color-amber-dark);
}

/* =========================================
   FOOTER
   ========================================= */
.site-footer {
  background: var(--color-ink);
  color: var(--color-cream);
  padding: 60px 0 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.footer-brand {
  text-align: center;
}

.footer-brand .logo-kanji {
  font-size: 2rem;
}

.footer-tagline {
  font-size: 0.75rem;
  color: var(--color-warm-gray);
  margin-top: 8px;
  letter-spacing: 0.15em;
}

.footer-nav ul {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.8rem;
  color: rgba(255, 248, 231, 0.6);
  transition: color 0.3s var(--ease-out);
}

.footer-nav a:hover {
  color: var(--color-gold);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  width: 100%;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--color-warm-gray);
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 960px) {
  .main-nav,
  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  /* Mobile Nav Overlay */
  .main-nav.open {
    display: flex;
    position: fixed;
    inset: 0;
    background: rgba(44, 36, 33, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    align-items: center;
    justify-content: center;
    z-index: 999;
  }

  .main-nav.open ul {
    flex-direction: column;
    align-items: center;
    gap: 36px;
  }

  .main-nav.open a {
    font-size: 1.3rem;
    letter-spacing: 0.12em;
  }

  .kodawari-grid,
  .products-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .howto-steps {
    flex-direction: column;
    align-items: center;
  }

  .howto-connector {
    width: 2px;
    height: 40px;
    margin: 16px 0;
  }
}

@media (max-width: 640px) {
  .hero-title-line {
    font-size: 1.8rem;
  }

  .hero-description br {
    display: none;
  }

  .product-info {
    padding: 20px 20px 24px;
  }

  .about-table th {
    display: block;
    padding-bottom: 4px;
    width: auto;
  }

  .about-table td {
    display: block;
    padding-top: 0;
    padding-bottom: 16px;
  }
}