/*
Theme Name: ZKING CORE THEME SERATIS
Theme URI: https://seratis.jp/
Author: ZKING CORE
Description: SERATIS top-page theme for the transparent mythic world of Z王 and SERA.
Version: 0.1.1
Text Domain: zking-core-seratis
Requires at least: 6.0
Tested up to: 6.6
Requires PHP: 8.0
*/

:root {
  --seratis-main-emerald: #00bfa5;
  --seratis-blue-emerald: #12d6c5;
  --seratis-deep-teal: #073f45;
  --seratis-deep-teal-soft: #0b6466;
  --seratis-pearl: #f7f3e8;
  --seratis-ivory: #fffaf0;
  --seratis-gold: #d9bf75;
  --seratis-pale-gold: #f0dc9a;
  --seratis-glass-white: rgba(255, 255, 255, 0.72);
  --seratis-glass-strong: rgba(255, 250, 240, 0.88);
  --seratis-emerald-glass: rgba(0, 191, 165, 0.16);
  --seratis-line: rgba(217, 191, 117, 0.48);
  --seratis-line-soft: rgba(7, 63, 69, 0.14);
  --seratis-text: #073f45;
  --seratis-text-soft: rgba(7, 63, 69, 0.74);
  --seratis-light-text: rgba(255, 250, 240, 0.86);
  --seratis-shadow: 0 24px 70px rgba(7, 63, 69, 0.14);
  --seratis-shadow-soft: 0 14px 44px rgba(0, 191, 165, 0.12);
  --seratis-max: 1120px;
  --seratis-radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--seratis-text);
  background:
    linear-gradient(180deg, var(--seratis-ivory) 0%, #effdf9 32%, #dff8f4 64%, var(--seratis-pearl) 100%);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
  line-height: 1.9;
  letter-spacing: 0;
  overflow-x: hidden;
}

body.seratis-nav-open {
  overflow: hidden;
}

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

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

.seratis-skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 1000;
  transform: translateY(calc(-100% - 24px));
  padding: 8px 12px;
  border: 1px solid var(--seratis-gold);
  border-radius: var(--seratis-radius);
  color: var(--seratis-text);
  background: var(--seratis-ivory);
  box-shadow: var(--seratis-shadow-soft);
  transition: transform 180ms ease;
}

.seratis-skip-link:focus {
  transform: translateY(0);
}

.seratis-site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px max(24px, calc((100vw - var(--seratis-max)) / 2));
  color: var(--seratis-text);
  background: rgba(255, 250, 240, 0.76);
  border-bottom: 1px solid rgba(217, 191, 117, 0.34);
  box-shadow: 0 12px 42px rgba(7, 63, 69, 0.08);
  backdrop-filter: blur(18px);
}

.seratis-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  white-space: nowrap;
}

.seratis-brand span {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.38rem;
  line-height: 1;
  color: var(--seratis-deep-teal);
}

.seratis-brand small {
  font-size: 0.78rem;
  color: #8c7434;
}

.seratis-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 191, 165, 0.42);
  border-radius: 999px;
  color: var(--seratis-deep-teal);
  background: rgba(255, 255, 255, 0.58);
  cursor: pointer;
  box-shadow: var(--seratis-shadow-soft);
}

.seratis-menu-toggle span,
.seratis-menu-toggle::before,
.seratis-menu-toggle::after {
  content: "";
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.seratis-menu-toggle {
  flex-direction: column;
  gap: 5px;
}

.seratis-nav-open .seratis-menu-toggle span {
  opacity: 0;
}

.seratis-nav-open .seratis-menu-toggle::before {
  transform: translateY(6px) rotate(42deg);
}

.seratis-nav-open .seratis-menu-toggle::after {
  transform: translateY(-6px) rotate(-42deg);
}

.seratis-primary-nav ul {
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seratis-primary-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 0.88rem;
  color: rgba(7, 63, 69, 0.76);
}

.seratis-primary-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 1px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, var(--seratis-gold), var(--seratis-blue-emerald));
  transition: transform 180ms ease;
}

.seratis-primary-nav a:hover,
.seratis-primary-nav a:focus-visible {
  color: var(--seratis-deep-teal);
}

.seratis-primary-nav a:hover::after,
.seratis-primary-nav a:focus-visible::after {
  transform: scaleX(1);
}

.seratis-main {
  position: relative;
  isolation: isolate;
}

.seratis-hero {
  position: relative;
  min-height: 94svh;
  display: grid;
  align-items: center;
  padding: 132px 24px 78px;
  overflow: hidden;
  border-bottom: 1px solid rgba(217, 191, 117, 0.34);
}

.seratis-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(90deg, rgba(255, 250, 240, 0.9), rgba(255, 250, 240, 0.64) 38%, rgba(18, 214, 197, 0.12) 70%, rgba(255, 250, 240, 0.2)),
    linear-gradient(180deg, rgba(255, 250, 240, 0.52), rgba(236, 252, 249, 0.18) 58%, var(--seratis-pearl) 100%),
    url("assets/images/seratis-emerald-myth-hero-v011.png");
  background-size: cover;
  background-position: center;
}

.seratis-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 30%;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(247, 243, 232, 0), rgba(247, 243, 232, 0.92)),
    repeating-linear-gradient(0deg, rgba(0, 191, 165, 0.08) 0 1px, transparent 1px 20px);
  opacity: 0.82;
}

.seratis-hero-inner,
.seratis-wrap {
  width: min(100%, var(--seratis-max));
  margin-inline: auto;
}

.seratis-hero-inner {
  display: grid;
  gap: 30px;
}

.seratis-eyebrow {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: #9b7e32;
  font-size: 0.9rem;
}

.seratis-eyebrow::before {
  content: "";
  width: 46px;
  height: 1px;
  background: currentColor;
}

.seratis-hero h1,
.seratis-section h2,
.seratis-final h2,
.seratis-page-title {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: 0;
}

.seratis-hero h1 {
  font-size: 4.7rem;
  color: var(--seratis-deep-teal);
  text-shadow: 0 10px 34px rgba(255, 250, 240, 0.72);
}

.seratis-hero-subtitle {
  display: grid;
  gap: 4px;
  margin: 12px 0 0;
  color: rgba(7, 63, 69, 0.74);
  font-size: 1.25rem;
}

.seratis-hero-copy {
  max-width: 680px;
  margin: 0;
  color: rgba(7, 63, 69, 0.86);
  font-size: 1.08rem;
}

.seratis-hero-lines {
  display: grid;
  gap: 8px;
  max-width: 760px;
  margin: 8px 0 0;
  padding: 18px 20px;
  border: 1px solid rgba(217, 191, 117, 0.42);
  border-left: 3px solid var(--seratis-main-emerald);
  border-radius: var(--seratis-radius);
  color: rgba(7, 63, 69, 0.76);
  background: rgba(255, 255, 255, 0.5);
  box-shadow: var(--seratis-shadow-soft);
  backdrop-filter: blur(12px);
}

.seratis-hero-lines p {
  margin: 0;
}

.seratis-section {
  padding: 108px 24px;
  border-bottom: 1px solid rgba(7, 63, 69, 0.1);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.26), rgba(0, 191, 165, 0.06));
}

.seratis-section.is-deep {
  color: var(--seratis-pearl);
  background:
    linear-gradient(135deg, rgba(7, 63, 69, 0.96), rgba(11, 120, 117, 0.92) 56%, rgba(18, 214, 197, 0.68)),
    var(--seratis-deep-teal);
}

.seratis-section.is-pearl {
  color: var(--seratis-text);
  background:
    linear-gradient(180deg, rgba(255, 250, 240, 0.92), rgba(235, 252, 248, 0.94)),
    var(--seratis-pearl);
}

.seratis-section-header {
  max-width: 780px;
  margin-bottom: 38px;
}

.seratis-section h2,
.seratis-final h2,
.seratis-page-title {
  color: var(--seratis-deep-teal);
  font-size: 2.8rem;
}

.seratis-section.is-deep h2,
.seratis-final h2 {
  color: var(--seratis-ivory);
}

.seratis-section-header p {
  margin: 16px 0 0;
  color: var(--seratis-text-soft);
}

.seratis-section.is-deep .seratis-section-header p,
.seratis-section.is-deep .seratis-copy,
.seratis-section.is-deep .seratis-card,
.seratis-section.is-deep .seratis-gallery-card figcaption {
  color: var(--seratis-light-text);
}

.seratis-section.is-deep .seratis-eyebrow,
.seratis-final .seratis-eyebrow {
  color: var(--seratis-pale-gold);
}

.seratis-copy {
  display: grid;
  gap: 16px;
  max-width: 780px;
  color: var(--seratis-text-soft);
}

.seratis-copy p {
  margin: 0;
}

.seratis-glass-grid,
.seratis-gallery-grid,
.seratis-network-grid {
  display: grid;
  gap: 18px;
}

.seratis-glass-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
}

.seratis-gallery-grid {
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr) minmax(0, 0.85fr);
}

.seratis-network-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.seratis-card,
.seratis-gallery-card,
.seratis-network-link,
.seratis-readable article {
  border: 1px solid var(--seratis-line-soft);
  border-radius: var(--seratis-radius);
  background:
    linear-gradient(145deg, var(--seratis-glass-white), rgba(255, 250, 240, 0.58)),
    var(--seratis-emerald-glass);
  box-shadow: var(--seratis-shadow);
  backdrop-filter: blur(16px);
}

.seratis-section.is-deep .seratis-card,
.seratis-section.is-deep .seratis-gallery-card {
  border-color: rgba(240, 220, 154, 0.34);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.18), rgba(255, 250, 240, 0.08)),
    rgba(18, 214, 197, 0.1);
}

.seratis-card {
  padding: 30px;
  color: var(--seratis-text-soft);
}

.seratis-card h3 {
  margin: 0 0 16px;
  color: var(--seratis-deep-teal);
  font-size: 1.3rem;
  font-weight: 400;
}

.seratis-card p,
.seratis-card ul {
  margin: 0;
}

.seratis-card ul {
  display: grid;
  gap: 8px;
  padding-left: 1.2em;
}

.seratis-card strong {
  color: #927636;
  font-weight: 500;
}

.seratis-dual {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.seratis-dual-item {
  padding: 28px;
  border: 1px solid rgba(240, 220, 154, 0.42);
  border-radius: var(--seratis-radius);
  background:
    linear-gradient(135deg, rgba(240, 220, 154, 0.18), rgba(18, 214, 197, 0.18)),
    rgba(255, 255, 255, 0.1);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.08);
}

.seratis-dual-item h3 {
  margin: 0 0 12px;
  color: var(--seratis-pale-gold);
  font-size: 1.25rem;
  font-weight: 500;
}

.seratis-dual-item p {
  margin: 0;
  color: var(--seratis-light-text);
}

.seratis-myth-line {
  margin-top: 32px;
  padding: 28px;
  border-left: 3px solid var(--seratis-gold);
  border-radius: 0 var(--seratis-radius) var(--seratis-radius) 0;
  color: var(--seratis-text-soft);
  background: rgba(255, 255, 255, 0.52);
}

.seratis-section.is-deep .seratis-myth-line {
  color: var(--seratis-light-text);
  background: rgba(255, 255, 255, 0.12);
}

.seratis-gallery-card {
  overflow: hidden;
}

.seratis-gallery-card img,
.seratis-symbol-panel {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.seratis-symbol-panel {
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--seratis-pearl);
  background:
    linear-gradient(145deg, rgba(0, 191, 165, 0.34), rgba(240, 220, 154, 0.18)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.04));
}

.seratis-symbol-panel span {
  display: block;
  width: 72%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 250, 240, 0.8), transparent);
  box-shadow: 0 16px 0 rgba(18, 214, 197, 0.32), 0 -16px 0 rgba(240, 220, 154, 0.3);
}

.seratis-gallery-card figcaption {
  padding: 18px;
  color: var(--seratis-text-soft);
}

.seratis-gallery-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--seratis-deep-teal);
  font-weight: 500;
}

.seratis-section.is-deep .seratis-gallery-card strong {
  color: var(--seratis-ivory);
}

.seratis-book-note {
  max-width: 860px;
  padding: 28px;
  border: 1px solid rgba(217, 191, 117, 0.42);
  border-radius: var(--seratis-radius);
  color: var(--seratis-text-soft);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(235, 252, 248, 0.72)),
    rgba(0, 191, 165, 0.08);
  box-shadow: var(--seratis-shadow-soft);
}

.seratis-book-note p {
  margin: 0;
}

.seratis-network-link {
  min-height: 150px;
  padding: 20px;
  color: var(--seratis-text-soft);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.seratis-network-link:hover,
.seratis-network-link:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(0, 191, 165, 0.52);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.88), rgba(225, 252, 247, 0.8)),
    rgba(0, 191, 165, 0.16);
}

.seratis-network-link strong {
  display: block;
  margin-bottom: 8px;
  color: #927636;
  font-size: 1rem;
  font-weight: 500;
}

.seratis-network-link span {
  display: block;
  font-size: 0.88rem;
}

.seratis-final {
  position: relative;
  padding: 116px 24px 132px;
  overflow: hidden;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(7, 63, 69, 0.96), rgba(0, 147, 133, 0.9) 58%, rgba(240, 220, 154, 0.5)),
    var(--seratis-deep-teal);
}

.seratis-final .seratis-copy {
  margin: 28px auto 0;
  color: var(--seratis-light-text);
}

.seratis-site-footer {
  padding: 34px 24px;
  color: rgba(7, 63, 69, 0.68);
  background: rgba(255, 250, 240, 0.92);
  border-top: 1px solid rgba(217, 191, 117, 0.34);
}

.seratis-footer-inner {
  width: min(100%, var(--seratis-max));
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.seratis-footer-mark {
  color: var(--seratis-deep-teal);
  font-family: Georgia, "Times New Roman", serif;
}

.seratis-backtop {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(0, 191, 165, 0.46);
  border-radius: 999px;
  color: var(--seratis-deep-teal);
  background: rgba(255, 250, 240, 0.78);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  cursor: pointer;
  box-shadow: var(--seratis-shadow-soft);
  backdrop-filter: blur(14px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.seratis-backtop.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.seratis-single {
  padding-top: 92px;
}

.seratis-readable {
  padding-block: 72px;
}

.seratis-readable article {
  padding: 34px;
  color: var(--seratis-text-soft);
}

.seratis-readable a {
  color: #007f73;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

:focus-visible {
  outline: 2px solid var(--seratis-main-emerald);
  outline-offset: 4px;
}

@media (max-width: 980px) {
  .seratis-site-header {
    padding-inline: 20px;
  }

  .seratis-menu-toggle {
    display: inline-flex;
  }

  .seratis-primary-nav {
    position: fixed;
    inset: 76px 14px auto 14px;
    display: none;
    padding: 18px;
    border: 1px solid rgba(217, 191, 117, 0.42);
    border-radius: var(--seratis-radius);
    background: rgba(255, 250, 240, 0.94);
    box-shadow: var(--seratis-shadow);
    backdrop-filter: blur(18px);
  }

  .seratis-nav-open .seratis-primary-nav {
    display: block;
  }

  .seratis-primary-nav ul {
    display: grid;
    gap: 8px;
  }

  .seratis-primary-nav a {
    width: 100%;
    min-height: 44px;
  }

  .seratis-hero {
    min-height: 88svh;
  }

  .seratis-hero h1 {
    font-size: 3.4rem;
  }

  .seratis-section h2,
  .seratis-final h2,
  .seratis-page-title {
    font-size: 2.25rem;
  }

  .seratis-glass-grid,
  .seratis-gallery-grid,
  .seratis-network-grid,
  .seratis-dual {
    grid-template-columns: 1fr;
  }

  .seratis-network-link {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .seratis-site-header {
    padding-block: 14px;
  }

  .seratis-brand {
    display: grid;
    gap: 3px;
  }

  .seratis-brand small {
    font-size: 0.72rem;
  }

  .seratis-hero {
    min-height: auto;
    padding: 112px 18px 64px;
  }

  .seratis-hero::before {
    background-position: 58% center;
  }

  .seratis-hero h1 {
    font-size: 2.85rem;
  }

  .seratis-hero-subtitle {
    font-size: 1.05rem;
  }

  .seratis-hero-copy,
  .seratis-hero-lines {
    font-size: 0.98rem;
  }

  .seratis-section,
  .seratis-final {
    padding-inline: 18px;
  }

  .seratis-section {
    padding-block: 78px;
  }

  .seratis-final {
    padding-block: 86px 104px;
  }

  .seratis-section h2,
  .seratis-final h2,
  .seratis-page-title {
    font-size: 1.9rem;
  }

  .seratis-card,
  .seratis-dual-item,
  .seratis-book-note,
  .seratis-readable article {
    padding: 22px;
  }

  .seratis-footer-inner {
    display: grid;
  }
}