/* styles.css */
/* =========================
   Chao System LP
   "和紙 × 墨 × 朱"
   No external UI libs, no JS
   ========================= */

/* --- CSS Variables --- */
:root{
  /* Colors */
  --c-washi: #f5f0e3;          /* base washi (warmer) */
  --c-washi-2: #efe7d7;        /* subtle depth (warmer) */
  --c-sumi: #1b1a18;           /* ink (near black) */
  --c-sumi-2: #3a3835;         /* soft ink */
  --c-usuzumi: #6a6660;        /* light ink */
  --c-line: rgba(27,26,24,.16);/* hairline */
  --c-line-2: rgba(27,26,24,.10);
  --c-aka: #b0302a;            /* vermilion (shu) - minimal */
  --c-aka-soft: rgba(176,48,42,.25);

  /* Typography */
  --ff-serif: "Noto Serif JP", serif;
  --ff-sans: "Noto Sans JP", system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;

  /* Layout */
  --maxw: 1100px;
  --pad-x: clamp(16px, 3vw, 28px);
  --space-1: clamp(10px, 1.8vw, 16px);
  --space-2: clamp(18px, 3.2vw, 28px);
  --space-3: clamp(28px, 5vw, 44px);
  --space-4: clamp(44px, 7vw, 72px);

  /* Radius / focus */
  --radius: 12px;
  --focus: 2px solid var(--c-aka);
}

/* --- Base --- */
*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
html{ background: var(--c-washi); }

body{
  position: relative;
  isolation: isolate; /* keep background overlays behind content */
  margin: 0;
  color: var(--c-sumi);
  font-family: var(--ff-sans);
  line-height: 1.9;
  letter-spacing: .02em;

  /* Washi base + suiboku wash (no images) */
  background:
    /* warm vignette edges */
    radial-gradient(1200px 800px at 50% 40%, rgba(255,255,255,.55), transparent 62%),
    radial-gradient(900px 650px at 15% 20%, rgba(60,50,40,.10), transparent 62%),
    radial-gradient(900px 650px at 90% 30%, rgba(60,50,40,.10), transparent 64%),
    radial-gradient(800px 600px at 70% 85%, rgba(60,50,40,.08), transparent 62%),

    /* large suiboku clouds */
    radial-gradient(700px 520px at 22% 28%, rgba(27,26,24,.070), transparent 62%),
    radial-gradient(820px 560px at 62% 18%, rgba(27,26,24,.055), transparent 64%),
    radial-gradient(760px 560px at 86% 58%, rgba(27,26,24,.050), transparent 62%),

    /* tiny vermilion hint (very subtle) */
    radial-gradient(900px 650px at 78% 6%, rgba(176,48,42,.030), transparent 62%),

    /* fibrous grain */
    repeating-linear-gradient(
      0deg,
      rgba(27,26,24,.018),
      rgba(27,26,24,.018) 1px,
      rgba(255,255,255,0) 3px,
      rgba(255,255,255,0) 7px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(27,26,24,.012),
      rgba(27,26,24,.012) 1px,
      rgba(255,255,255,0) 4px,
      rgba(255,255,255,0) 10px
    ),

    /* paper base */
    linear-gradient(180deg, var(--c-washi), var(--c-washi-2));
  background-attachment: fixed;
}

/* Global background overlays */
/* Lotus silhouette (always farthest back) */
body::before{
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("./image/hasu.png");
  background-repeat: no-repeat;
  background-position: right 6% bottom 26%;
  background-size: min(720px, 70vmin);
  opacity: .16;
  filter: blur(.35px);
  mix-blend-mode: multiply;
}

/* Paper stains / edge darkening */
body::after{
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    /* subtle edge darkening like aged paper */
    radial-gradient(closest-side at 50% 50%, transparent 68%, rgba(60,50,40,.12) 100%),
    /* very soft stains */
    radial-gradient(420px 320px at 18% 82%, rgba(60,50,40,.08), transparent 70%),
    radial-gradient(520px 360px at 88% 18%, rgba(60,50,40,.06), transparent 72%);
  mix-blend-mode: multiply;
  opacity: .55;
}

a{
  color: inherit;
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

a:hover{ text-decoration-color: var(--c-aka); }
a:focus-visible{ outline: var(--focus); outline-offset: 3px; border-radius: 6px; }

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

.container{
  width: min(var(--maxw), 100%);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

/* Skip link */
.skip-link{
  position: absolute;
  left: 12px;
  top: 10px;
  padding: 10px 12px;
  background: rgba(246,241,231,.92);
  border: 1px solid var(--c-line);
  border-radius: 10px;
  transform: translateY(-140%);
  transition: transform .2s ease;
  z-index: 999;
}
.skip-link:focus-visible{ transform: translateY(0); outline: var(--focus); }

/* Utility */
.accent{ color: var(--c-aka); }
.lead{
  font-size: clamp(16px, 1.9vw, 18px);
  color: var(--c-sumi);
}

/* --- Header (simple) --- */
.header{
  position: relative;
  z-index: 1;
  padding-block: var(--space-2);
}
.header__inner{
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.header__eyebrow{
  margin: 0;
  font-size: 13px;
  color: var(--c-usuzumi);
  letter-spacing: .08em;
}
.header__nav{
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
}
.header__link{
  font-size: 14px;
  color: var(--c-sumi-2);
  text-decoration: none;
  padding-block: 2px;
  border-bottom: 1px solid transparent;
}
.header__link:hover{ border-bottom-color: var(--c-aka-soft); }
.header__link:focus-visible{ outline: var(--focus); outline-offset: 3px; border-radius: 6px; }

/* --- Hero --- */
.hero{
  position: relative;
  z-index: 1;
  padding-block: clamp(52px, 9vw, 92px);
  overflow: hidden;

  /* Top hero background image */
  background-color: var(--c-washi);
  /* Try both paths (in case the file is in /image) */
  background-image:
    url("./top.png"),
    url("./image/top.png");
  background-repeat: no-repeat;
  background-size: cover;
  /* keep the right-side motif visible, leave room for text on the left */
  background-position: right center;
  min-height: clamp(320px, 42vw, 560px);
}

/* Ink-bleed / suiboku feel (soft) */
.hero::before{
  content:"";
  position: absolute;
  inset: -40px -20px;
  background:
    radial-gradient(800px 520px at 25% 20%, rgba(27,26,24,.08), transparent 60%),
    radial-gradient(700px 460px at 65% 0%, rgba(27,26,24,.06), transparent 62%),
    radial-gradient(800px 520px at 85% 55%, rgba(27,26,24,.05), transparent 60%),
    radial-gradient(600px 420px at 30% 70%, rgba(176,48,42,.035), transparent 62%);
  filter: blur(1.4px);
  z-index: 0;
  pointer-events: none;
}

/* Soft veil to keep hero text readable over the image */
.hero::after{
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg,
      rgba(245,240,227,.85) 0%,
      rgba(245,240,227,.55) 38%,
      rgba(245,240,227,0) 70%
    );
}
.hero__inner{
  position: relative;
  display: grid;
  gap: 14px;
  z-index: 1;
}
.hero__kicker{
  margin: 0;
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--c-usuzumi);
}
.hero__title{
  margin: 0;
  font-family: var(--ff-serif);
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.2;
  font-size: clamp(30px, 4.4vw, 52px);
}
.hero__subtitle{
  margin: 0;
  color: var(--c-sumi-2);
  font-size: clamp(14px, 1.8vw, 16px);
  letter-spacing: .06em;
}

.hero__scroll{
  margin-top: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--c-usuzumi);
  letter-spacing: .18em;
  user-select: none;
}
.hero__arrow{
  display: inline-block;
  font-size: 18px;
  transform: translateY(-1px);
}
.hero__scrollText{
  font-size: 12px;
  text-transform: uppercase;
}

/* --- Divider --- */
.divider{
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line), transparent);
  margin-inline: var(--pad-x);
}

/* --- Sections --- */
.section{
  position: relative;
  z-index: 1;
  padding-block: var(--space-4);
}
.section__title{
  margin: 0 0 var(--space-2);
  font-family: var(--ff-serif);
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.25;
  font-size: clamp(18px, 2.3vw, 22px);
  color: var(--c-sumi);
  position: relative;
  padding-bottom: 10px;
}
.section__title::after{
  content:"";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 88px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-aka), transparent);
  opacity: .85;
}
.section__dot{
  color: var(--c-aka);
  font-size: .85em;
  margin-right: .5em;
}

/* --- Greeting (2 columns) --- */
.greeting{
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(18px, 4vw, 44px);
  align-items: start;
}
.greeting__media{
  position: relative;
  min-height: 260px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.18);
  overflow: hidden;
}
.greeting__frame{
  display: none;
}
.greeting__img{
  display: block;
  width: 100%;
  height: 100%;
  min-height: 260px;
  object-fit: cover;
  /* slightly blend into washi */
  filter: grayscale(.25) contrast(1.04);
  opacity: .94;
}
.greeting__placeholder{
  margin: 0;
  color: var(--c-usuzumi);
  font-size: 13px;
  line-height: 1.8;
  position: relative;
  padding-top: 8px;
}
.greeting__body p{
  margin: 0 0 14px;
  color: var(--c-sumi-2);
}
.greeting__body p:last-child{ margin-bottom: 0; }

/* --- Values (3 columns with vertical lines) --- */
.values{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--c-line-2);
  border-bottom: 1px solid var(--c-line-2);
}
.values__item{
  padding: var(--space-2) clamp(16px, 2.6vw, 28px);
  position: relative;
}
.values__item + .values__item{
  border-left: 1px solid var(--c-line-2);
}
.values__icon{
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(27,26,24,.28);
  background: radial-gradient(circle at 30% 30%, rgba(27,26,24,.18), rgba(27,26,24,.02));
  margin-bottom: 10px;
}
.values__title{
  margin: 0 0 6px;
  font-family: var(--ff-serif);
  font-weight: 700;
  letter-spacing: .08em;
  font-size: 18px;
}
.values__text{
  margin: 0;
  color: var(--c-sumi-2);
}

/* --- Services (3 columns, separated by hairlines) --- */
.services{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}
.services__item{
  padding: var(--space-2) clamp(16px, 2.6vw, 28px);
}
.services__item + .services__item{
  border-left: 1px solid var(--c-line-2);
}
.services__title{
  margin: 0 0 10px;
  font-family: var(--ff-serif);
  font-weight: 700;
  letter-spacing: .06em;
  font-size: 18px;
  position: relative;
  padding-left: 14px;
}
.services__title::before{
  content:"●";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--c-aka);
  font-size: 12px;
  transform: translateY(2px);
}

/* Services: add visual hierarchy (lead + boxed examples) */
.services__lead{
  margin: 0 0 14px;
  color: var(--c-sumi);
  font-weight: 600;
  line-height: 1.9;
}

.services__details{
  margin-top: 10px;
  padding: 12px 14px 12px;
  border: 1px solid var(--c-line-2);
  border-radius: 12px;
  background: rgba(255,255,255,.24);
}

.services__summary{
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-sumi-2);
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}

/* hide default marker */
.services__summary::-webkit-details-marker{ display:none; }

/* left badge icon */
.services__summary::before{
  content: "▼";
  display: inline-flex;
  width: 22px;
  height: 22px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(176,48,42,.45);
  color: var(--c-aka);
  font-size: 12px;
  transform: translateY(1px);
}

details[open] > .services__summary::before{
  content: "▲";
}

.services__details .services__list{
  margin-top: 10px;
  color: var(--c-sumi-2);
}

.services__desc{
  margin: 0 0 14px;
  color: var(--c-sumi-2);
  display: none;
}
.services__label{
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-usuzumi);
  display: none;
}
.services__list{
  margin: 0;
  padding-left: 0;
  color: var(--c-sumi-2);
}
.services__list li{
  list-style: none;
  margin: 0;
  padding: 8px 0 8px 26px;
  position: relative;
}
.services__list li:last-child{ margin-bottom: 0; }
.services__list li::before{
  content: "◦";
  position: absolute;
  left: 10px;
  top: 8px;
  color: var(--c-aka);
  font-size: 18px;
  line-height: 1;
}

/* --- Timeline --- */
.timeline{
  position: relative;
  padding-left: 24px;
}
.timeline__line{
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(27,26,24,.22), transparent);
}
.timeline__item{
  position: relative;
  padding: 0 0 var(--space-2);
}
.timeline__item:last-child{ padding-bottom: 0; }

.timeline__item::before{
  content:"";
  position: absolute;
  left: -20px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(176,48,42,.55);
  background: rgba(176,48,42,.12);
}
.timeline__title{
  margin: 0 0 6px;
  font-family: var(--ff-serif);
  font-weight: 700;
  letter-spacing: .06em;
  font-size: 16px;
}
.timeline__text{
  margin: 0;
  color: var(--c-sumi-2);
}

/* --- Contact --- */
.contact__lead{
  margin: 0 0 var(--space-2);
  color: var(--c-sumi-2);
}
.contact__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  min-width: 210px;
  text-decoration: none;
  border-radius: 999px;
  font-size: 14px;
  letter-spacing: .08em;
  transition: transform .08s ease, background-color .15s ease, border-color .15s ease;
  user-select: none;
}
.btn:active{ transform: translateY(1px); }
.btn:focus-visible{ outline: var(--focus); outline-offset: 4px; }

.btn--ink{
  border: 1px solid rgba(176,48,42,.55);
  background: rgba(255,255,255,.35);
  color: var(--c-sumi);
}
.btn--ink:hover{
  border-color: rgba(176,48,42,.78);
  background: rgba(255,255,255,.55);
}

.btn--outline{
  border: 1px solid rgba(27,26,24,.22);
  background: transparent;
  color: var(--c-sumi);
  position: relative;
}
.btn--outline::after{
  content:"";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 10px;
  height: 1px;
  background: rgba(176,48,42,.45);
  transform: scaleX(.55);
  transform-origin: left;
  transition: transform .18s ease;
}
.btn--outline:hover::after{ transform: scaleX(1); }

.contact__note{
  margin: 0 0 14px;
  font-size: 12px;
  color: var(--c-usuzumi);
  letter-spacing: .06em;
}
.contact__plain{
  display: grid;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--c-line-2);
}
.contact__plainItem{
  margin: 0;
  color: var(--c-sumi-2);
  font-size: 14px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}
.contact__plainLabel{
  color: var(--c-usuzumi);
  letter-spacing: .12em;
  font-size: 12px;
  min-width: 52px;
}
.contact__plainLink{
  color: var(--c-sumi);
  text-decoration-color: rgba(176,48,42,.35);
}
.contact__plainLink:hover{ text-decoration-color: var(--c-aka); }

/* --- Footer --- */
.footer{
  position: relative;
  z-index: 1;
  padding-block: var(--space-2);
  border-top: 1px solid var(--c-line-2);
}
.footer__inner{
  display: flex;
  justify-content: center;
}
.footer__copy{
  color: var(--c-usuzumi);
  letter-spacing: .10em;
}

/* --- Responsive --- */
@media (max-width: 900px){
  .greeting{
    grid-template-columns: 1fr;
  }
  .greeting__media{ min-height: 220px; }
  .greeting__img{ min-height: 220px; }
}

@media (max-width: 820px){
  .values{
    grid-template-columns: 1fr;
    border-left: 0;
    border-right: 0;
  }
  .values__item + .values__item{
    border-left: 0;
    border-top: 1px solid var(--c-line-2);
  }

  .services{
    grid-template-columns: 1fr;
  }
  .services__item + .services__item{
    border-left: 0;
    border-top: 1px solid var(--c-line-2);
  }

  .btn{ min-width: 100%; }
  .services__details{ padding: 12px 12px; }
}

@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior: auto !important; transition: none !important; }
}