:root {
  --navy-900: #0b1f33;
  --navy-700: #123a5f;
  --navy-500: #205a8c;
  --accent: #ff6f61;
  --teal: #45d6d3;
  --bg: #f5f8fb;
  --text: #1f2933;
  --muted: #617185;
  --card-bg: #ffffff;
  --shadow-lg: 0 24px 48px rgba(11, 31, 51, 0.15);
  --shadow-md: 0 18px 32px rgba(11, 31, 51, 0.12);
  --shadow-sm: 0 6px 18px rgba(11, 31, 51, 0.08);
}

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

body {
  margin: 0;
  font-family: "Inter", "Noto Sans JP", "Hiragino Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.text-accent {
  color: var(--accent);
}

.text-muted {
  color: var(--muted);
}

.text-note {
  color: var(--navy-900);
}

.page-wrap {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(245, 248, 251, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(18, 58, 95, 0.08);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--navy-900);
  text-decoration: none;
}

.brand-icon {
  width: 36px;
  height: 36px;
  display: block;
}

.brand-title {
  display: inline-block;
}

.author-portrait {
  width: 128px;
  height: auto;
  display: block;
  margin: 1.75rem auto 1.25rem;
  filter: drop-shadow(0 12px 24px rgba(6, 18, 41, 0.25));
}

.nav-list {
  display: flex;
  gap: 1.3rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--navy-700);
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  opacity: 0;
  transform: scaleX(0.8);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--accent);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  opacity: 1;
  transform: scaleX(1);
}

main {
  flex: 1 0 auto;
}

.section {
  padding: 4.5rem 1.75rem;
}

.section-header {
  max-width: 760px;
  margin: 0 auto 3rem;
  text-align: center;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  background: rgba(32, 90, 140, 0.12);
  color: var(--navy-700);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section h2 {
  margin: 1rem 0 0.75rem;
  font-size: 2.25rem;
  color: var(--navy-900);
}

.section p {
  color: var(--muted);
  margin: 0;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 6rem 1.75rem 5rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, #061226 0%, #0a2441 55%, #10395c 100%);
  z-index: -2;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 18% 22%, rgba(94, 234, 212, 0.18), transparent 60%),
    radial-gradient(circle at 78% 12%, rgba(255, 111, 97, 0.14), transparent 62%);
  opacity: 0.22;
  z-index: -1;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  color: #ffffff;
  display: grid;
  gap: 3rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.hero-intro h1 {
  font-size: 3rem;
  margin: 1rem 0 1.75rem;
  letter-spacing: -0.02em;
}

.hero-intro p {
  color: #ffffff;
  text-shadow: none;
}

.tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: rgba(69, 214, 211, 0.14);
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  box-shadow: var(--shadow-md);
  color: #fff;
}

.btn-outline {
  border-color: rgba(255, 255, 255, 0.4);
  color: #f4faff;
  background: rgba(255, 255, 255, 0.05);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hero-card {
  background: #08152b;
  border: 1px solid rgba(94, 234, 212, 0.5);
  border-radius: 24px;
  padding: 2rem;
  color: #ffffff;
  box-shadow: 0 18px 36px rgba(6, 16, 34, 0.5);
}

.hero-card h2 {
  margin-top: 0;
  color: #ffffff;
}

.hero-card strong {
  color: #ffffff;
}

.hero-card p {
  color: #ffffff;
}

.hero-card li {
  color: #ffffff;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.hero-card li + li {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  padding-top: 1rem;
  margin-top: 1rem;
}

.hero-card.is-enhanced li {
  opacity: 0.35;
}

.hero-card.is-enhanced li.is-active {
  opacity: 1;
  transform: translateY(-2px);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  list-style: none;
  background: rgba(12, 32, 58, 0.72);
  color: #ffffff;
  font-size: 0.9rem;
}

.card-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  gap: 1.8rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 1.9rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(11, 31, 51, 0.06);
}

.card h3 {
  margin-top: 0.4rem;
  margin-bottom: 0.75rem;
  color: var(--navy-900);
}

.card p {
  margin: 0;
  color: var(--muted);
}

.badge {
  display: inline-block;
  margin-top: 1.2rem;
  padding: 0.3rem 0.8rem;
  border-radius: 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--navy-700);
  background: rgba(69, 214, 211, 0.22);
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 780px;
  margin-inline: auto;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: linear-gradient(var(--navy-500), rgba(11, 31, 51, 0));
}

.timeline-item {
  position: relative;
  padding-left: 2.5rem;
  padding-bottom: 2.5rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 6px rgba(69, 214, 211, 0.35);
}

.timeline-item h4 {
  margin: 0 0 0.4rem;
  color: var(--navy-700);
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
}

.split-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.profile-card {
  background: var(--card-bg);
  border-radius: 24px;
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(11, 31, 51, 0.05);
}

.profile-card h3 {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.profile-grid {
  display: grid;
  gap: 1.4rem;
}

.list-reset {
  list-style: none;
  padding: 0;
  margin: 0;
}

.list-reset li + li {
  margin-top: 0.75rem;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--navy-500);
}

.resource-link::after {
  content: "→";
  font-size: 0.85rem;
  transition: transform 0.18s ease;
}

.resource-link:hover::after {
  transform: translateX(4px);
}

.diary-grid {
  align-items: start;
}

.diary-editor {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.diary-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.diary-label {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  font-weight: 600;
  color: var(--navy-700);
}

.diary-input,
.diary-textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(11, 31, 51, 0.12);
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  box-shadow: inset 0 1px 2px rgba(11, 31, 51, 0.04);
}

.diary-textarea {
  resize: vertical;
  min-height: 200px;
}

.diary-input:focus,
.diary-textarea:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(69, 214, 211, 0.25);
}

.diary-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.form-errors {
  border: 1px solid rgba(255, 111, 97, 0.3);
  background: rgba(255, 111, 97, 0.1);
  color: var(--navy-900);
  border-radius: 16px;
  padding: 1rem 1.2rem;
}

.form-errors ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--accent);
}

.form-errors li + li {
  margin-top: 0.4rem;
}

.diary-entries h3 {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.diary-empty {
  color: var(--muted);
}

.diary-password-callout {
  border: 1px dashed rgba(18, 58, 95, 0.3);
  border-radius: 18px;
  padding: 1.5rem;
  background: rgba(32, 90, 140, 0.06);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.diary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.diary-item {
  border: 1px solid rgba(11, 31, 51, 0.08);
  border-radius: 18px;
  padding: 1.2rem 1.4rem;
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.diary-item-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.diary-item-meta h4 {
  margin: 0 0 0.4rem;
  color: var(--navy-700);
  font-size: 1.15rem;
}

.diary-item-meta time {
  font-size: 0.9rem;
  color: var(--muted);
}

.diary-item-author {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.diary-delete {
  border: none;
  background: rgba(255, 111, 97, 0.12);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.diary-delete:hover {
  background: rgba(255, 111, 97, 0.22);
  transform: translateY(-1px);
}

.diary-delete-form {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: flex-end;
}

.diary-delete-password {
  flex: 1 1 160px;
  min-width: 140px;
  max-width: 220px;
  width: auto;
  padding: 0.55rem 0.75rem;
  border-radius: 999px;
}

.diary-item-body {
  color: var(--text);
  line-height: 1.6;
}

.diary-item-body p {
  margin: 0 0 0.9rem;
}

.diary-item-body p:last-child {
  margin-bottom: 0;
}

.flash {
  max-width: 1100px;
  margin: 1rem auto;
  padding: 0.85rem 1.2rem;
  border-radius: 14px;
  font-weight: 600;
}

.flash-notice {
  background: rgba(69, 214, 211, 0.15);
  color: var(--navy-900);
  border: 1px solid rgba(69, 214, 211, 0.35);
}

.flash-alert {
  background: rgba(255, 111, 97, 0.12);
  color: var(--navy-900);
  border: 1px solid rgba(255, 111, 97, 0.4);
}

footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.8);
  padding: 2.5rem 1.75rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.82);
  font-weight: 600;
}

.footer-links a:hover {
  color: #fff;
}

@media (max-width: 880px) {
  .nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .hero-intro h1 {
    font-size: 2.4rem;
  }

  .section {
    padding: 3.5rem 1.5rem;
  }
}

@media (max-width: 620px) {
  header {
    position: static;
  }

  .nav {
    align-items: flex-start;
  }

  .nav-list {
    flex-wrap: wrap;
    gap: 0.7rem 1rem;
  }

  .hero {
    padding: 4.5rem 1.25rem 4rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .section h2 {
    font-size: 1.9rem;
  }
}

.profile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.profile-list strong {
  display: block;
  margin-bottom: 0.35rem;
}

.profile-list p {
  margin: 0;
}

.profile-list li + li {
  padding-top: 1rem;
}

.focus-pill-list {
  justify-content: center;
  margin-top: 1.75rem;
}

.will-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.hero-card .profile-list strong {
  color: #ffffff;
}

.hero-card .profile-list p {
  color: #ffffff;
}

.hero-card .profile-list li + li {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-card .profile-list li {
  color: #ffffff;
}

.diary-link-card {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
  position: relative;
  margin: 0.65rem 0;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  border: 1px solid rgba(11, 31, 51, 0.08);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.diary-link-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.diary-link-card:focus-within {
  box-shadow: var(--shadow-md), 0 0 0 2px rgba(255, 111, 97, 0.35);
}

.diary-link-card__preview {
  flex: 0 0 110px;
  height: 72px;
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.diary-link-card__preview iframe {
  width: 100%;
  height: 100%;
  border: 0;
  pointer-events: none;
}

.diary-link-card__meta {
  flex: 1 1 auto;
  position: relative;
  min-width: 0;
}

.diary-link-card__host {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 0.35rem;
}

.diary-link-card__title {
  display: block;
  font-weight: 600;
  color: var(--navy-700);
  line-height: 1.5;
  word-break: break-word;
  padding-right: 2rem;
  transition: color 0.2s ease;
}

.diary-link-card__icon {
  position: absolute;
  right: 1rem;
  top: 0.8rem;
  font-size: 0.95rem;
  color: var(--muted);
  pointer-events: none;
}

.diary-link-card__description {
  margin: 0.45rem 0 0;
  font-size: 0.9rem;
  color: rgba(11, 31, 51, 0.76);
  line-height: 1.5;
}

.diary-link-card__overlay {
  position: absolute;
  inset: 0;
  display: block;
  border-radius: inherit;
  z-index: 5;
}

.diary-link-card__overlay:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.diary-link-card:hover .diary-link-card__title {
  color: var(--navy-900);
}

.diary-link-card:hover .diary-link-card__icon {
  color: var(--navy-600);
}