/* ===================================
   SINGLE POST PAGE — Premium Design
   =================================== */

:root {
  --c-navy-dark: #0a0a2e;
  --c-navy: #0f1147;
  --c-blue-deep: #1a1a6e;
  --c-blue: #2020aa;
  --c-blue-bright: #3a3aff;
  --c-blue-light: #6060ff;
  --c-accent: #4fc3f7;
  --c-white: #ffffff;
  --c-white-80: rgba(255,255,255,0.8);
  --c-white-60: rgba(255,255,255,0.6);
  --c-white-40: rgba(255,255,255,0.4);
  --c-white-20: rgba(255,255,255,0.2);
  --c-white-10: rgba(255,255,255,0.1);
  --c-white-05: rgba(255,255,255,0.05);
  --c-bg-light: #f7f8fc;
  --c-bg-warm: #fafbff;
  --c-border: rgba(10,10,46,0.06);
  --c-border-medium: rgba(10,10,46,0.1);
  --c-text-dark: #0a0a2e;
  --c-text-body: #3a3a5a;
  --c-text-muted: #8a8aa0;
  --ff-display: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --ff-en: "Syne", sans-serif;
  --ff-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --max-width: 1400px;
  --content-width: 1200px;
  --article-width: 780px;
  --side-pad: clamp(1.5rem, 5vw, 5rem);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-soft: 0 2px 16px rgba(10,10,46,0.06);
  --shadow-hover: 0 8px 32px rgba(10,10,46,0.1);
}

/* ==========================================
   RESET & BASE
   ========================================== */
.p-single *, .p-single *::before, .p-single *::after,
.c-header *, .c-footer * { box-sizing: border-box; }

.p-single {
  overflow: clip;
  font-family: var(--ff-body);
  font-weight: 400;
  line-height: 1.8;
  color: var(--c-text-dark);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.custom-single-post #content,
body.custom-single-post #body_wrap { padding: 0 !important; margin: 0 !important; }
body.custom-single-post .l-header,
body.custom-single-post .l-footer,
body.custom-single-post #fix_bottom_menu { display: none !important; }

/* Hide SWELL default TOC */
.p-single .p-toc,
.p-single .p-toc--upper,
.p-single #toc,
.p-single [class*="swell-toc"],
.p-single .post_content > .toc,
.p-single-body__inner > .p-toc,
.p-single-body .p-toc { display: none !important; }

/* Fade-up */
.p-single .fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.9s cubic-bezier(0.33,0,0.2,1), transform 0.9s cubic-bezier(0.33,0,0.2,1);
}
.p-single .fade-up.is-visible { opacity: 1; transform: translateY(0); }

@keyframes spotlightDrift {
  0%   { background-position: 20% 40%; }
  12%  { background-position: 55% 25%; }
  25%  { background-position: 80% 55%; }
  37%  { background-position: 65% 75%; }
  50%  { background-position: 30% 65%; }
  62%  { background-position: 10% 45%; }
  75%  { background-position: 50% 20%; }
  87%  { background-position: 75% 50%; }
  100% { background-position: 20% 40%; }
}

/* ==========================================
   READING PROGRESS BAR
   ========================================== */
.p-single-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1100;
  background: transparent;
}
.p-single-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-blue-bright), var(--c-accent));
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* ==========================================
   HEADER
   ========================================== */
.c-header {
  position: fixed !important; top: 0 !important; left: 0; right: 0; z-index: 1000;
  padding: 0 var(--side-pad) !important; background: var(--c-white) !important;
  height: 120px !important; display: flex !important; align-items: center !important;
  transition: box-shadow var(--transition);
}
.c-header.is-scrolled { box-shadow: var(--shadow-soft); }
.c-header__inner { max-width: var(--max-width); margin: 0 auto; width: 100%; display: flex !important; align-items: center !important; justify-content: space-between; }
.c-header__logo { text-decoration: none; display: flex !important; align-items: center !important; }
.c-header__logo-img { height: 36px; width: auto; display: block; }
.c-header__logo-text { font-family: var(--ff-en); font-size: 1.25rem; font-weight: 600; color: var(--c-navy-dark); line-height: 1; }
.c-header__nav { display: flex !important; align-items: center !important; }
.c-header__nav-list { display: flex !important; align-items: center !important; list-style: none; margin: 0 !important; padding: 0 !important; }
.c-header__nav-list li a { display: flex; align-items: center; padding: 0.5rem 1.5rem; color: var(--c-text-dark); text-decoration: none; font-size: 0.9375rem; font-weight: 500; font-family: var(--ff-en); letter-spacing: 0.02em; line-height: 1; transition: opacity var(--transition); }
.c-header__nav-list li a:hover { opacity: 0.5; }
.c-header__cta { display: inline-flex !important; align-items: center !important; gap: 0.5rem; margin-left: 1.5rem; padding: 0.5rem 1.5rem; border-radius: 100px; background: var(--c-blue-bright); color: var(--c-white); text-decoration: none; font-size: 0.9375rem; font-weight: 600; font-family: var(--ff-en); transition: var(--transition); }
.c-header__cta:hover { background: var(--c-blue-light); transform: translateY(-1px); }
.c-header__hamburger { display: none; flex-direction: column; justify-content: center; align-items: center; gap: 6px; width: 44px; height: 44px; background: none; border: none; cursor: pointer; z-index: 1001; }
.c-header__hamburger span { display: block; width: 22px; height: 1.5px; background: var(--c-navy-dark); transition: var(--transition); }
.c-header__hamburger.is-open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.c-header__hamburger.is-open span:nth-child(2) { opacity: 0; }
.c-header__hamburger.is-open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ==========================================
   FOOTER
   ========================================== */
.c-footer { padding: 0; background: transparent; color: var(--c-white); }
.c-footer__card { border-radius: 24px 24px 0 0; background: linear-gradient(160deg, #050520 0%, #0a0a3a 35%, #101060 65%, #1a1a90 100%); overflow: hidden; position: relative; }
.c-footer__card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 20%, rgba(80,120,255,0.15) 0%, transparent 55%), radial-gradient(ellipse at 20% 80%, rgba(100,60,255,0.1) 0%, transparent 55%); pointer-events: none; }
.c-footer__inner { position: relative; max-width: var(--content-width); margin: 0 auto; padding: clamp(3.5rem, 7vw, 5.5rem) clamp(2.5rem, 5vw, 5rem); }
.c-footer__top { display: grid; grid-template-columns: minmax(240px, 1fr) minmax(300px, 1.8fr); gap: clamp(3rem, 6vw, 6rem); padding-bottom: clamp(3rem, 5vw, 4rem); }
.c-footer__company { display: flex; flex-direction: column; }
.c-footer__logo { text-decoration: none; display: inline-flex; align-items: center; }
.c-footer__logo-img { height: 40px; width: auto; filter: brightness(0) invert(1); }
.c-footer__logo-text { font-family: var(--ff-en); font-size: 1.5rem; font-weight: 700; color: var(--c-white); letter-spacing: 0.04em; }
.c-footer__details { margin-top: 1.5rem; }
.c-footer__company-name { font-size: 0.8125rem; font-weight: 600; color: var(--c-white); margin: 0; }
.c-footer__address { font-size: 0.75rem; line-height: 1.9; color: var(--c-white-60); margin: 0.5rem 0 0; }
.c-footer__nav { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.75rem, 3vw, 2.5rem) clamp(2rem, 4vw, 4rem); }
.c-footer__nav a { display: block; text-decoration: none; color: var(--c-white); transition: opacity var(--transition); }
.c-footer__nav a:hover { opacity: 0.6; }
.c-footer__nav-en { display: block; font-family: var(--ff-en); font-size: clamp(1.5rem, 2.5vw, 2.25rem); font-weight: 600; line-height: 1.2; letter-spacing: 0.01em; }
.c-footer__nav-ja { display: block; font-size: 0.75rem; color: var(--c-white-60); margin-top: 0.35rem; letter-spacing: 0.05em; }
.c-footer__bottom { display: flex; justify-content: space-between; align-items: center; padding-top: clamp(1.5rem, 3vw, 2rem); border-top: 1px solid var(--c-white-10); }
.c-footer__links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.c-footer__links a { font-size: 0.75rem; color: var(--c-white-60); text-decoration: none; transition: color var(--transition); }
.c-footer__links a:hover { color: var(--c-white); }
.c-footer__copy { font-size: 0.7rem; color: var(--c-white-40); font-family: var(--ff-en); margin: 0; }

/* ==========================================
   HERO
   ========================================== */
.p-single-hero {
  position: relative;
  padding-top: clamp(160px, 22vh, 240px);
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
  background: var(--c-white);
}
.p-single-hero__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}
.p-single-hero__meta-top {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.p-single-hero__cat {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 1.125rem;
  background: linear-gradient(135deg, var(--c-blue-bright), var(--c-blue-light));
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-white);
  letter-spacing: 0.04em;
}
.p-single-hero__read-time {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-muted);
}
.p-single-hero__title {
  font-family: var(--ff-display);
  font-size: clamp(1.625rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.55;
  color: var(--c-text-dark);
  margin: 0;
  letter-spacing: -0.01em;
}
.p-single-hero__meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
}
.p-single-hero__date,
.p-single-hero__updated {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--ff-en);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
}

/* ==========================================
   THUMBNAIL
   ========================================== */
.p-single-thumbnail {
  padding: 0 0 clamp(2rem, 4vw, 3rem);
  background: var(--c-white);
}
.p-single-thumbnail__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}
.p-single-thumbnail__img {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  display: block;
  box-shadow: 0 4px 24px rgba(10,10,46,0.08);
}

/* ==========================================
   CONTENT AREA — 2 Column Layout
   ========================================== */
.p-single-content {
  background: var(--c-white);
  padding: 0 0 clamp(4rem, 7vw, 6rem);
}
.p-single-content__inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--side-pad);
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: clamp(2.5rem, 4vw, 4rem);
  align-items: start;
}

/* ==========================================
   TABLE OF CONTENTS
   ========================================== */

/* --- Common --- */
.p-single-toc__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 0.875rem;
  border-bottom: 2px solid var(--c-navy-dark);
  margin-bottom: 0;
}
.p-single-toc__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-blue-bright);
}
.p-single-toc__title {
  font-family: var(--ff-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-text-dark);
  letter-spacing: 0.04em;
}
.p-single-toc__toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  cursor: pointer;
  color: var(--c-text-muted);
  transition: transform var(--transition);
}
.p-single-toc__toggle.is-closed {
  transform: rotate(-90deg);
}
.p-single-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc-counter;
}
.p-single-toc__list li {
  counter-increment: toc-counter;
}
.p-single-toc__list li a {
  display: flex;
  align-items: baseline;
  gap: 0.625rem;
  padding: 0.625rem 0;
  text-decoration: none;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-text-body);
  border-bottom: 1px solid var(--c-border);
  transition: color var(--transition), padding-left var(--transition);
}
.p-single-toc__list li a::before {
  content: counter(toc-counter, decimal-leading-zero);
  font-family: var(--ff-en);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--c-text-muted);
  min-width: 1.5em;
  transition: color var(--transition);
}
.p-single-toc__list li a:hover {
  color: var(--c-blue-bright);
}
.p-single-toc__list li a:hover::before {
  color: var(--c-blue-bright);
}
.p-single-toc__list li a.is-active {
  color: var(--c-blue-bright);
  font-weight: 600;
}
.p-single-toc__list li a.is-active::before {
  color: var(--c-blue-bright);
}

/* H3 indent */
.p-single-toc__list li.toc-h3 a {
  padding-left: 1.5rem;
  font-size: 0.75rem;
  color: var(--c-text-muted);
  border-bottom: 1px solid rgba(10,10,46,0.03);
}
.p-single-toc__list li.toc-h3 a::before {
  font-size: 0.625rem;
}
.p-single-toc__list li.toc-h3 a.is-active {
  color: var(--c-blue-bright);
  font-weight: 600;
}

/* --- Desktop (Sidebar) --- */
.p-single-toc--desktop {
  position: sticky;
  top: 140px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-height: calc(100vh - 180px);
  overflow-y: auto;
}
.p-single-toc--desktop::-webkit-scrollbar { width: 3px; }
.p-single-toc--desktop::-webkit-scrollbar-track { background: transparent; }
.p-single-toc--desktop::-webkit-scrollbar-thumb { background: var(--c-border-medium); border-radius: 10px; }

/* --- Mobile (In-article) --- */
.p-single-toc--mobile {
  display: none;
  margin-bottom: 2.5rem;
  background: var(--c-bg-warm);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
}
.p-single-toc--mobile .p-single-toc__header {
  cursor: pointer;
  padding-bottom: 0;
  border-bottom: none;
  margin-bottom: 0;
  user-select: none;
}
.p-single-toc--mobile .p-single-toc__list {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--c-border);
}
.p-single-toc--mobile .p-single-toc__list.is-collapsed {
  display: none;
}

/* ==========================================
   ARTICLE BODY — Premium Typography
   ========================================== */
.p-single-body {
  min-width: 0;
}
.p-single-body__inner {
  /* no max-width here, parent grid handles it */
}

/* --- Headings --- */
.p-single-body__inner h2 {
  font-family: var(--ff-display);
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 800;
  line-height: 1.5;
  color: var(--c-text-dark);
  margin: 3.5rem 0 1.5rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--c-bg-light) 0%, var(--c-bg-warm) 100%);
  border-left: 4px solid var(--c-blue-bright);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  position: relative;
}
.p-single-body__inner h2:first-child {
  margin-top: 0;
}
.p-single-body__inner h3 {
  font-family: var(--ff-display);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--c-text-dark);
  margin: 3rem 0 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--c-border-medium);
  position: relative;
}
.p-single-body__inner h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 3rem;
  height: 2px;
  background: var(--c-blue-bright);
}
.p-single-body__inner h4 {
  font-family: var(--ff-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--c-text-dark);
  margin: 2.5rem 0 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--c-accent);
}

/* --- Paragraphs --- */
.p-single-body__inner p {
  font-size: 0.9375rem;
  line-height: 2.15;
  color: var(--c-text-body);
  margin: 0 0 2rem;
  letter-spacing: 0.02em;
  font-feature-settings: "palt";
}
.p-single-body__inner p:last-child {
  margin-bottom: 0;
}

/* --- Strong / Bold --- */
.p-single-body__inner strong,
.p-single-body__inner b {
  font-weight: 700;
  color: var(--c-text-dark);
  background: linear-gradient(transparent 60%, rgba(58,58,255,0.1) 60%);
}

/* --- Links --- */
.p-single-body__inner a {
  color: var(--c-blue-bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), opacity var(--transition);
}
.p-single-body__inner a:hover {
  border-bottom-color: var(--c-blue-bright);
  opacity: 0.8;
}

/* --- Lists --- */
.p-single-body__inner ul,
.p-single-body__inner ol {
  margin: 0 0 2rem;
  padding: 1.5rem 1.5rem 1.5rem 2.75rem;
  background: var(--c-bg-warm);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
}
.p-single-body__inner ul { list-style: none; }
.p-single-body__inner ol { list-style: none; counter-reset: ol-counter; }
.p-single-body__inner ul li { position: relative; padding-left: 0.25rem; }
.p-single-body__inner ul li::before {
  content: "";
  position: absolute;
  left: -1.25rem;
  top: 0.85em;
  width: 6px;
  height: 6px;
  background: var(--c-blue-bright);
  border-radius: 50%;
}
.p-single-body__inner ol li {
  counter-increment: ol-counter;
  position: relative;
  padding-left: 0.25rem;
}
.p-single-body__inner ol li::before {
  content: counter(ol-counter);
  position: absolute;
  left: -1.75rem;
  top: 0.2em;
  width: 1.375rem;
  height: 1.375rem;
  background: var(--c-blue-bright);
  color: var(--c-white);
  border-radius: 50%;
  font-family: var(--ff-en);
  font-size: 0.6875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.p-single-body__inner li {
  font-size: 0.9375rem;
  line-height: 2;
  color: var(--c-text-body);
  padding-top: 0.25rem;
  padding-bottom: 0.25rem;
}
.p-single-body__inner li + li {
  border-top: 1px solid var(--c-border);
  margin-top: 0;
}

/* --- Blockquote --- */
.p-single-body__inner blockquote {
  margin: 2.5rem 0;
  padding: 2rem 2rem 2rem 2.5rem;
  border-left: 4px solid var(--c-blue-bright);
  background: linear-gradient(135deg, rgba(58,58,255,0.03), rgba(79,195,247,0.03));
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-size: 0.9375rem;
  line-height: 2.1;
  color: var(--c-text-body);
  position: relative;
}
.p-single-body__inner blockquote::before {
  content: "\201C";
  position: absolute;
  top: -0.25rem;
  left: 0.75rem;
  font-size: 3.5rem;
  font-family: Georgia, serif;
  color: var(--c-blue-bright);
  opacity: 0.2;
  line-height: 1;
}
.p-single-body__inner blockquote p {
  margin: 0;
}

/* --- Images --- */
.p-single-body__inner img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  margin: 2.5rem 0;
  box-shadow: 0 2px 12px rgba(10,10,46,0.06);
}
.p-single-body__inner .wp-block-image {
  margin: 2.5rem 0;
}
.p-single-body__inner .wp-block-image img {
  margin: 0;
}
.p-single-body__inner .wp-block-image figcaption {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  text-align: center;
  margin-top: 0.75rem;
  font-style: italic;
}

/* --- Tables --- */
.p-single-body__inner table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--c-border);
  box-shadow: 0 1px 4px rgba(10,10,46,0.03);
}
.p-single-body__inner th,
.p-single-body__inner td {
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  text-align: left;
}
.p-single-body__inner th {
  font-weight: 700;
  color: var(--c-white);
  background: linear-gradient(135deg, var(--c-navy-dark), var(--c-navy));
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
}
.p-single-body__inner td {
  color: var(--c-text-body);
  border-bottom: 1px solid var(--c-border);
}
.p-single-body__inner tr:last-child td {
  border-bottom: none;
}
.p-single-body__inner tr:nth-child(even) td {
  background: var(--c-bg-light);
}

/* --- Code --- */
.p-single-body__inner code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.85em;
  background: var(--c-bg-light);
  padding: 0.2em 0.5em;
  border-radius: 4px;
  color: var(--c-blue);
  border: 1px solid var(--c-border);
}
.p-single-body__inner pre {
  margin: 2.5rem 0;
  padding: 1.75rem;
  background: var(--c-navy-dark);
  border-radius: var(--radius-md);
  overflow-x: auto;
  position: relative;
}
.p-single-body__inner pre code {
  background: none;
  color: var(--c-white-80);
  padding: 0;
  font-size: 0.8125rem;
  line-height: 1.9;
  border: none;
}

/* --- Horizontal rule --- */
.p-single-body__inner hr,
.p-single-body__inner .wp-block-separator {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-border-medium), transparent);
  margin: 3.5rem 0;
}

/* --- SWELL block resets --- */
.p-single-body__inner .swell-block-balloon,
.p-single-body__inner .swell-block-faq,
.p-single-body__inner .swell-block-step {
  font-size: 0.9375rem;
  line-height: 2;
}

/* ==========================================
   SHARE BUTTONS
   ========================================== */
.p-single-share {
  padding: 0 0 clamp(2rem, 4vw, 3rem);
  background: var(--c-white);
}
.p-single-share__inner {
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 0 var(--side-pad);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--c-border);
}
.p-single-share__label {
  font-family: var(--ff-en);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--c-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.p-single-share__buttons {
  display: flex;
  gap: 0.625rem;
}
.p-single-share__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1.5px solid var(--c-border-medium);
  background: var(--c-white);
  color: var(--c-text-body);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
}
.p-single-share__btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 4px 16px rgba(10,10,46,0.1);
}
.p-single-share__btn--x:hover { background: #000; color: var(--c-white); border-color: #000; }
.p-single-share__btn--fb:hover { background: #1877F2; color: var(--c-white); border-color: #1877F2; }
.p-single-share__btn--hatena:hover { background: #00A4DE; color: var(--c-white); border-color: #00A4DE; }
.p-single-share__btn--copy:hover { background: var(--c-blue-bright); color: var(--c-white); border-color: var(--c-blue-bright); }
.p-single-share__btn--copy.is-copied { background: #22c55e; color: var(--c-white); border-color: #22c55e; }

/* ==========================================
   POST NAVIGATION
   ========================================== */
.p-single-nav {
  padding: 0 0 clamp(2rem, 4vw, 3rem);
  background: var(--c-white);
}
.p-single-nav__inner {
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 0 var(--side-pad);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.p-single-nav__link {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--c-bg-warm);
  border: 1px solid var(--c-border);
  text-decoration: none;
  color: var(--c-text-dark);
  transition: all 0.4s cubic-bezier(0.16,1,0.3,1);
}
.p-single-nav__link:hover {
  background: var(--c-white);
  border-color: var(--c-blue-bright);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.p-single-nav__link--next {
  text-align: right;
  align-items: flex-end;
}
.p-single-nav__direction {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--c-blue-bright);
  letter-spacing: 0.04em;
}
.p-single-nav__title {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================
   BACK TO LIST
   ========================================== */
.p-single-back {
  padding: 0 0 clamp(3rem, 5vw, 4rem);
  background: var(--c-white);
  text-align: center;
}
.p-single-back__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 1rem 2.5rem;
  border: 1.5px solid var(--c-navy-dark);
  border-radius: 100px;
  background: transparent;
  color: var(--c-navy-dark);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.4s cubic-bezier(0.16,1,0.3,1);
}
.p-single-back__btn:hover {
  background: var(--c-blue-bright);
  border-color: var(--c-blue-bright);
  color: var(--c-white);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(58,58,255,0.25);
}
.p-single-back__btn svg {
  transition: transform 0.4s cubic-bezier(0.16,1,0.3,1);
}
.p-single-back__btn:hover svg {
  transform: translateX(-4px);
}

/* ==========================================
   CTA
   ========================================== */
.p-single-cta {
  position: relative; padding: clamp(3rem, 6vw, 5rem) var(--side-pad);
  padding-bottom: clamp(4rem, 7vw, 6rem); background: var(--c-bg-light);
}
.p-single-cta__inner { max-width: var(--content-width); margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); }
.p-single-cta__block {
  position: relative; display: flex; flex-direction: column; justify-content: center; align-items: center;
  padding: clamp(3rem, 5vw, 4.5rem) 2rem; text-decoration: none; color: var(--c-text-dark);
  background: var(--c-white); border-radius: var(--radius-xl); border: 1px solid var(--c-border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  transition: transform 0.4s cubic-bezier(0.16,1,0.3,1), box-shadow 0.4s cubic-bezier(0.16,1,0.3,1), border-color var(--transition);
}
.p-single-cta__block:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--c-blue-bright); }
.p-single-cta__en {
  font-family: var(--ff-en); font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 600;
  background: radial-gradient(circle, rgba(240,240,255,0.95) 0%, rgba(160,160,220,0.5) 25%, transparent 55%),
    linear-gradient(135deg, #050520 0%, #0a0a3a 25%, #101060 50%, #1a1a80 75%, #2a2aaa 100%);
  background-size: 300% 300%, 100% 100%;
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  animation: spotlightDrift 16s ease-in-out infinite; transition: var(--transition);
}
.p-single-cta__block:hover .p-single-cta__en {
  background: radial-gradient(circle, rgba(224,224,255,0.95) 0%, rgba(140,140,230,0.5) 25%, transparent 55%),
    linear-gradient(135deg, #1a1a60 0%, #2a2a8e 30%, #3a3abb 60%, #4a4add 100%);
  background-size: 300% 300%, 100% 100%;
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  animation: spotlightDrift 10s ease-in-out infinite;
}
.p-single-cta__ja { font-size: 0.8125rem; color: var(--c-blue); margin-top: 0.5rem; }
.p-single-cta__icon {
  position: absolute; right: clamp(1.5rem, 3vw, 2.5rem); top: 50%; transform: translateY(-50%);
  width: 48px; height: 48px; border-radius: 50%; border: 1.5px solid var(--c-border-medium);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-navy-dark); background: transparent; transition: all 0.4s cubic-bezier(0.16,1,0.3,1);
}
.p-single-cta__block:hover .p-single-cta__icon { background: var(--c-blue-bright); color: var(--c-white); border-color: var(--c-blue-bright); transform: translateY(-50%) scale(1.1); }
.p-single-cta__icon svg { transition: transform 0.4s cubic-bezier(0.16,1,0.3,1); }
.p-single-cta__block:hover .p-single-cta__icon svg { transform: translateX(3px); }

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 1024px) {
  .p-single-content__inner {
    grid-template-columns: 1fr;
  }
  .p-single-sidebar {
    display: none;
  }
  .p-single-toc--mobile {
    display: block;
  }
  .c-footer__top { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 768px) {
  .c-header { height: 80px !important; }
  .c-header__hamburger { display: flex; }
  .c-header__nav {
    position: fixed; top: 0; right: -100%; width: 80%; max-width: 340px;
    height: 100vh; height: 100dvh; background: rgba(10,10,46,0.98); backdrop-filter: blur(20px);
    flex-direction: column; justify-content: center; align-items: flex-start; padding: 2rem;
    transition: right 0.4s cubic-bezier(0.4,0,0.2,1);
  }
  .c-header__nav.is-open { right: 0; }
  .c-header__nav-list { flex-direction: column; align-items: flex-start; width: 100%; }
  .c-header__nav-list li { width: 100%; }
  .c-header__nav-list li a { padding: 0.875rem 0; font-size: 1rem; color: var(--c-white) !important; border-bottom: 1px solid var(--c-white-10); }
  .c-header__cta { margin-left: 0; margin-top: 1.5rem; width: 100%; justify-content: center; }

  .p-single-hero { padding-top: 120px; }
  .p-single-hero__title { font-size: clamp(1.25rem, 5vw, 1.75rem); }
  .p-single-hero__meta-top { flex-wrap: wrap; gap: 0.625rem; }

  .p-single-thumbnail__img { border-radius: var(--radius-md); max-height: 360px; }

  .p-single-body__inner h2 {
    padding: 1rem 1.25rem;
    font-size: clamp(1.2rem, 4.5vw, 1.5rem);
  }

  .p-single-share__inner { flex-direction: column; align-items: flex-start; gap: 1rem; }

  .p-single-nav__inner { grid-template-columns: 1fr; }
  .p-single-nav__link--next { text-align: left; align-items: flex-start; }
  .p-single-nav__link--next .p-single-nav__direction { flex-direction: row-reverse; }

  .p-single-cta__inner { grid-template-columns: 1fr; }
  .c-footer__card { border-radius: 16px 16px 0 0; }
  .c-footer__bottom { flex-direction: column; gap: 0.75rem; text-align: center; }
}

@media (max-width: 480px) {
  .p-single-body__inner ul,
  .p-single-body__inner ol {
    padding: 1.25rem 1.25rem 1.25rem 2.25rem;
  }
  .p-single-body__inner blockquote {
    padding: 1.5rem 1.25rem 1.5rem 1.75rem;
  }
  .p-single-body__inner table {
    font-size: 0.8125rem;
    display: block;
    overflow-x: auto;
  }
}