/* =========================================================
   YukinoLeo Personal Blog - Glass Homepage
   Glass styling is intentionally limited to the homepage.
   Blog / Research / Projects archive pages use Butterfly.
   ========================================================= */

:root {
  --glass-bg: #f7f8fb;
  --glass-surface: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.75);
  --text-main: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --accent: #7c8db5;
  --max-width: 1180px;
  --radius-lg: 28px;
  --radius-md: 20px;
}

/* Homepage reset */
.glass-home-page {
  margin: 0;
  padding: 0;
  background: var(--glass-bg);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", Arial, sans-serif;
  overflow-x: hidden;
}

.glass-home-page *,
.glass-home-page *::before,
.glass-home-page *::after {
  box-sizing: border-box;
}

/* Background */
.glass-home-page::before {
  content: "";
  position: fixed;
  width: 520px;
  height: 520px;
  top: -180px;
  left: -160px;
  background: radial-gradient(circle, rgba(170, 190, 240, 0.35), transparent 70%);
  filter: blur(30px);
  pointer-events: none;
  z-index: -1;
}

.glass-home-page::after {
  content: "";
  position: fixed;
  width: 600px;
  height: 600px;
  right: -200px;
  bottom: -200px;
  background: radial-gradient(circle, rgba(220, 190, 240, 0.28), transparent 70%);
  filter: blur(40px);
  pointer-events: none;
  z-index: -1;
}

/* Navbar */
.glass-navbar {
  position: fixed;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: min(calc(100% - 48px), var(--max-width));
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 20px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 10px 35px rgba(60, 70, 100, 0.08);
  z-index: 100;
}

.glass-logo {
  color: var(--text-main);
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.glass-nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.glass-nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.25s ease, transform 0.25s ease;
}

.glass-nav-links a:hover {
  color: var(--text-main);
  transform: translateY(-1px);
}

/* Main */
.glass-main {
  width: 100%;
}

/* Hero */
.glass-hero {
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-layout {
  width: min(980px, 100%);
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  column-gap: 70px;
  text-align: left;
}

.hero-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero-right {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.hero-avatar {
  width: 150px;
  height: 150px;
  margin-bottom: 42px;
  border-radius: 50%;
  overflow: hidden;
  border: 5px solid rgba(255, 255, 255, 0.85);
  box-shadow: 0 20px 60px rgba(50, 60, 90, 0.16);
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-eyebrow {
  margin-bottom: 28px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  white-space: nowrap;
}

.hero-title {
  margin: 0;
  font-size: clamp(48px, 5vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.045em;
  font-weight: 750;
  color: var(--text-main);
}

.hero-description {
  max-width: 560px;
  margin: 24px 0 0;
  color: var(--text-secondary);
  font-size: 21px;
  line-height: 1.8;
  letter-spacing: -0.01em;
}

.hero-links {
  display: flex;
  gap: 12px;
  margin-top: 0;
  justify-content: center;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  transition: transform 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.hero-link:hover {
  color: var(--text-main);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(60, 70, 100, 0.1);
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: 90px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.16em;
  transition: transform 0.25s ease;
}

.scroll-hint i {
  animation: scrollArrow 1.8s ease-in-out infinite;
}

.scroll-hint:hover {
  transform: translateY(4px);
}

@keyframes scrollArrow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(7px); }
}

/* Sections */
.glass-section {
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
  padding: 120px 0;
}

.section-heading {
  margin-bottom: 54px;
}

.section-eyebrow {
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

.section-heading h2 {
  margin: 0;
  font-size: 52px;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.section-heading p {
  max-width: 620px;
  margin: 18px 0 0;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
}

/* Blog post cards */
.glass-post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.glass-post-card {
  min-height: 280px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  background: var(--glass-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 18px 60px rgba(60, 70, 100, 0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-post-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 25px 70px rgba(60, 70, 100, 0.12);
}

.post-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.post-date,
.post-category {
  font-size: 12px;
  color: var(--text-muted);
}

.post-category {
  color: var(--accent);
  font-weight: 600;
}

.glass-post-card h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.glass-post-card h3 a {
  color: var(--text-main);
  text-decoration: none;
}

.post-excerpt {
  margin: 16px 0 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.post-tag {
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(130, 145, 180, 0.1);
  color: var(--text-secondary);
  font-size: 11px;
}

.post-read-more {
  margin-top: auto;
  padding-top: 28px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}

/* Blog columns */
.blog-columns-block {
  margin-top: 42px;
}

.blog-subheading {
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  opacity: 0.55;
}

/* Column cards (reuse .glass-project-card, slightly compact) */
.blog-column-card {
  padding: 28px 30px;
}

.blog-column-card h3 {
  margin-top: 12px;
  margin-bottom: 10px;
}

.blog-column-card p {
  margin-bottom: 20px;
  line-height: 1.7;
  font-size: 14px;
  opacity: 0.72;
}

.blog-column-card .project-link {
  font-size: 13px;
}

/* Latest article */
.latest-article-block {
  margin-top: 58px;
}

.blog-card-main {
  min-width: 0;
}

.blog-card-meta {
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.blog-card-excerpt {
  max-width: 760px;
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.blog-card-arrow {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: auto;
  align-self: flex-start;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.8);
  color: var(--text-secondary);
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(60, 70, 100, 0.08);
  transition: transform 0.25s ease, background 0.25s ease;
}

.blog-card-arrow:hover {
  transform: translateX(4px);
  background: #fff;
}

/* Research / project cards */
.glass-project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.glass-project-card {
  position: relative;
  overflow: hidden;
  min-height: 300px;
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--glass-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 25px 70px rgba(60, 70, 100, 0.12);
}

.project-number {
  color: var(--text-muted);
  font-size: 12px;
  letter-spacing: 0.15em;
}

.glass-project-card h3 {
  margin: 20px 0 12px;
  color: var(--text-main);
  font-size: 28px;
}

.glass-project-card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

/* Project / Research covers */
.project-cover {
  width: 100%;
  height: 180px;
  margin: 0 0 24px;
  border-radius: 18px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.45);
}

.project-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s ease;
}

.glass-project-card:hover .project-cover img {
  transform: scale(1.04);
}

.project-card-content {
  position: relative;
}

.project-venue {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.58;
}

/* Section action */
.section-action {
  margin-top: 30px;
}

.glass-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}

.glass-button:hover {
  opacity: 0.7;
}

/* Footer */
.glass-footer {
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
  padding: 70px 0 50px;
  border-top: 1px solid rgba(120, 130, 150, 0.12);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-content p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 22px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
}

/* =========================================================
   Mobile
   ========================================================= */

@media (max-width: 760px) {
  .glass-navbar {
    width: calc(100% - 28px);
    top: 14px;
    padding: 0 18px;
  }

  .glass-nav-links {
    gap: 14px;
  }

  .glass-nav-links a {
    font-size: 12px;
  }

  .glass-hero {
    min-height: 82vh;
    padding: 120px 24px 80px;
  }

  .hero-layout {
    width: 100%;
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .hero-left,
  .hero-right {
    align-items: center;
    text-align: center;
  }

  .hero-avatar {
    width: 135px;
    height: 135px;
    margin-bottom: 24px;
    border-width: 4px;
  }

  .hero-eyebrow {
    margin-bottom: 24px;
    font-size: 11px;
    letter-spacing: 0.18em;
  }

  .hero-title {
    font-size: 52px;
    line-height: 1.08;
    letter-spacing: -0.04em;
  }

  .hero-description {
    max-width: 520px;
    margin-top: 20px;
    font-size: 18px;
    line-height: 1.75;
  }

  .hero-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }

  .scroll-hint {
    margin-top: 48px;
  }

  .glass-section {
    width: calc(100% - 32px);
    padding: 80px 0;
  }

  .section-heading {
    margin-bottom: 40px;
  }

  .section-heading h2 {
    font-size: 40px;
  }

  .section-heading p {
    font-size: 15px;
  }

  .glass-post-grid,
  .glass-project-grid {
    grid-template-columns: 1fr;
  }

  .project-cover {
    height: 160px;
    margin-bottom: 20px;
    border-radius: 16px;
  }

  .blog-column-card {
    padding: 24px 26px;
  }

  .latest-article-block {
    margin-top: 48px;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .glass-footer {
    width: calc(100% - 32px);
    padding-top: 60px;
  }
}