/* =========================================================
   Renko Academic Glass Theme
   Inspired by glassmorphism academic blog style
   ========================================================= */

/* ---------- Root Variables ---------- */

:root {
  --bg: #0b0d12;
  --bg-deep: #07080d;

  --glass: rgba(20, 24, 32, 0.68);
  --glass-light: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.14);

  --text: #ebe7df;
  --text-soft: #c9c2b8;
  --muted: #938b80;

  --accent: #d7b46a;
  --accent-soft: #b8965e;

  --link: #a9c7e8;
  --link-hover: #d8eaff;

  --shadow: rgba(0, 0, 0, 0.42);
}

/* ---------- Global Background ---------- */

html {
  min-height: 100%;
  background: var(--bg-deep);
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;

  color: var(--text);
  font-family:
    Georgia,
    "Times New Roman",
    "Noto Serif SC",
    "Songti SC",
    serif;
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;

  background:
    linear-gradient(rgba(7, 8, 13, 0.72), rgba(7, 8, 13, 0.86)),
    radial-gradient(circle at 20% 10%, rgba(215, 180, 106, 0.18), transparent 28rem),
    radial-gradient(circle at 80% 20%, rgba(120, 160, 220, 0.12), transparent 30rem),
    var(--bg-deep);

  background-attachment: fixed;
}

/* ---------- Page Transitions ---------- */

.has-page-transitions body {
  animation: page-fade-in 280ms ease both;
}

.has-page-transitions .site-header,
.has-page-transitions .page-content,
.has-page-transitions .site-footer {
  transition:
    opacity 220ms ease,
    transform 220ms ease,
    filter 220ms ease;
}

.has-page-transitions .page-content {
  animation: content-rise-in 360ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.has-page-transitions body.is-page-leaving .site-header,
.has-page-transitions body.is-page-leaving .site-footer {
  opacity: 0;
  transform: translateY(-0.35rem);
}

.has-page-transitions body.is-page-leaving .page-content {
  opacity: 0;
  transform: translateY(0.7rem) scale(0.985);
  filter: blur(4px);
}

@keyframes page-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes content-rise-in {
  from {
    opacity: 0;
    transform: translateY(0.8rem) scale(0.99);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .has-page-transitions body,
  .has-page-transitions .page-content {
    animation: none;
  }

  .has-page-transitions .site-header,
  .has-page-transitions .page-content,
  .has-page-transitions .site-footer {
    transition: none;
  }
}

body {
  background:
    linear-gradient(rgba(7, 8, 13, 0.62), rgba(7, 8, 13, 0.82)),
    url("/assets/images/background.jpg") center center / cover fixed no-repeat;
}


/* ---------- Main Layout ---------- */

.wrapper,
.container,
.page-content,
main {
  max-width: 980px;
  margin: 0 auto;
  padding-left: 1.4rem;
  padding-right: 1.4rem;
}

.page-content {
  margin-top: 2.2rem;
  margin-bottom: 3.5rem;
  padding-top: 2rem;
  padding-bottom: 2.5rem;

  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 18px;

  box-shadow:
    0 18px 48px var(--shadow),
    inset 0 1px 0 var(--glass-light);

  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* ---------- Header / Navigation ---------- */

.site-header {
  background: rgba(10, 12, 18, 0.62);
  border-bottom: 1px solid var(--glass-border);

  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);

  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.28);
}

.site-title,
.site-title:visited {
  color: var(--text);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.site-title:hover {
  color: var(--accent);
  text-decoration: none;
}

.site-nav .page-link {
  color: var(--text-soft);
  transition: color 0.15s ease;
}

.site-nav .page-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---------- Headings ---------- */

h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  font-family:
    Georgia,
    "Times New Roman",
    "Noto Serif SC",
    serif;
  font-weight: 500;
  line-height: 1.35;
}

h1 {
  font-size: 2.25rem;
  margin-top: 0;
  margin-bottom: 1.3rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--glass-border);
}

h2 {
  font-size: 1.55rem;
  margin-top: 2.1rem;
  color: #efe4d2;
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.6rem;
  color: #e1d6c7;
}

/* ---------- Text ---------- */

p {
  margin: 0.8rem 0 1rem;
}

strong {
  color: #fff1dc;
  font-weight: 600;
}

em {
  color: #ddd2c3;
}

small {
  color: var(--muted);
}

/* ---------- Links ---------- */

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:visited {
  color: #c7b5db;
}

/* ---------- Lists ---------- */

ul, ol {
  padding-left: 1.4rem;
}

li {
  margin: 0.35rem 0;
}

li::marker {
  color: var(--accent-soft);
}

/* ---------- Glass Cards ---------- */

.note-card,
.post-card,
.card,
.notes-list li,
.pdf-list li {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--glass-border);
  border-radius: 14px;

  padding: 1rem 1.15rem;
  margin: 0.9rem 0;

  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.26),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);

  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);

  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    background 0.16s ease;
}

.note-card:hover,
.post-card:hover,
.card:hover,
.notes-list li:hover,
.pdf-list li:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(215, 180, 106, 0.36);
}

.notes-list,
.pdf-list {
  list-style: none;
  padding-left: 0;
}

/* ---------- Home Sections ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0.85rem;
  margin: 1.2rem 0 1.6rem;
}

.tile,
.tile:visited {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-height: 5.8rem;
  padding: 1rem 1.1rem;

  color: var(--text);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  text-decoration: none;

  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);

  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    background 0.16s ease;
}

.tile:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(215, 180, 106, 0.36);
  text-decoration: none;
  transform: translateY(-2px);
}

.tile span {
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.45;
}

/* ---------- Note Actions ---------- */

.note-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.button,
.button:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.15rem;
  padding: 0.2rem 0.8rem;

  color: #17130d;
  background: var(--accent);
  border: 1px solid rgba(255, 235, 186, 0.5);
  border-radius: 7px;

  font-size: 0.92rem;
  line-height: 1.2;
  text-decoration: none;

  box-shadow:
    0 7px 18px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.26);

  transition:
    transform 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
}

.button:hover {
  color: #0f0c08;
  background: #efd08a;
  border-color: rgba(255, 241, 204, 0.82);
  text-decoration: none;
  transform: translateY(-1px);
}

.button.ghost,
.button.ghost:visited {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--glass-border);
}

.button.ghost:hover {
  color: #fff4df;
  background: rgba(215, 180, 106, 0.18);
  border-color: rgba(215, 180, 106, 0.44);
}

.button[href$=".pdf"]::before,
.button[href$=".tex"]::before {
  content: none;
}

/* ---------- Music Player ---------- */

.music-player {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 40;

  width: min(24rem, calc(100vw - 2rem));
  margin: 0;
  padding: 0.85rem;

  background: rgba(20, 24, 32, 0.86);
  border: 1px solid var(--glass-border);
  border-radius: 14px;

  box-shadow:
    0 16px 42px rgba(0, 0, 0, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);

  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.music-player-header,
.music-controls,
.music-time {
  display: flex;
  align-items: center;
}

.music-player-header {
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.75rem;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.music-player.is-dragging .music-player-header {
  cursor: grabbing;
}

.music-player-heading {
  min-width: 0;
}

.music-label {
  display: block;
  color: var(--accent);
  font-size: 0.76rem;
  font-variant: small-caps;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.music-player-heading strong {
  display: block;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.music-player .meta {
  margin: 0.05rem 0 0;
  line-height: 1.2;
}

.music-window-actions {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: flex-end;
  cursor: auto;
}

.music-window-actions .button {
  min-height: 2rem;
  padding: 0.15rem 0.65rem;
}

.music-toggle-button {
  min-height: 2rem;
  padding: 0.15rem 0.65rem;

  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--glass-border);
  border-radius: 7px;
  cursor: pointer;

  font: inherit;
  font-size: 0.9rem;
  line-height: 1.2;

  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

.music-toggle-button:hover {
  color: #fff4df;
  background: rgba(215, 180, 106, 0.18);
  border-color: rgba(215, 180, 106, 0.44);
}

.music-player-launcher {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 41;

  min-height: 2.35rem;
  padding: 0.25rem 0.85rem;

  color: #17130d;
  background: var(--accent);
  border: 1px solid rgba(255, 235, 186, 0.5);
  border-radius: 999px;
  cursor: pointer;

  font: inherit;
  font-size: 0.92rem;
  line-height: 1.2;

  box-shadow:
    0 10px 28px rgba(0, 0, 0, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.26);

  transition:
    transform 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
}

.music-player-launcher:hover {
  background: #efd08a;
  border-color: rgba(255, 241, 204, 0.82);
  transform: translateY(-1px);
}

.music-controls {
  gap: 0.65rem;
}

.music-play-button {
  flex: 0 0 auto;
  min-width: 4.8rem;
  min-height: 2.3rem;
  padding: 0.2rem 0.8rem;

  color: #17130d;
  background: var(--accent);
  border: 1px solid rgba(255, 235, 186, 0.5);
  border-radius: 7px;
  cursor: pointer;

  font: inherit;
  font-size: 0.92rem;
  line-height: 1.2;

  box-shadow:
    0 7px 18px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.26);

  transition:
    transform 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
}

.music-play-button:hover {
  background: #efd08a;
  border-color: rgba(255, 241, 204, 0.82);
  transform: translateY(-1px);
}

.music-timeline {
  flex: 1 1 auto;
  min-width: 0;
}

.music-progress {
  width: 100%;
  accent-color: var(--accent);
}

.music-time {
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.2;
}

.music-list {
  display: none;
  gap: 0.5rem;
  list-style: none;
  max-height: 13rem;
  margin: 0.85rem 0 0;
  padding: 0;
  overflow-y: auto;
  padding-right: 0.15rem;
}

.music-player.is-expanded .music-list {
  display: grid;
}

.music-list li {
  margin: 0;
}

.music-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  width: 100%;
  min-height: 2.65rem;
  padding: 0.45rem 0.65rem;

  color: var(--text-soft);
  background: rgba(0, 0, 0, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  cursor: pointer;

  font: inherit;
  text-align: left;

  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

.music-track:hover,
.music-track.is-active {
  color: var(--text);
  background: rgba(215, 180, 106, 0.12);
  border-color: rgba(215, 180, 106, 0.36);
}

.music-track span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.music-track small {
  flex: 0 0 auto;
  color: var(--muted);
}

body {
  padding-bottom: 7.5rem;
}

/* ---------- PDF / TeX Links ---------- */

a[href$=".pdf"]::before {
  content: "PDF ";
  color: var(--accent);
  font-variant: small-caps;
  letter-spacing: 0.05em;
}

a[href$=".tex"]::before {
  content: "TeX ";
  color: var(--accent-soft);
  font-variant: small-caps;
  letter-spacing: 0.05em;
}

/* ---------- Code ---------- */

code {
  background: rgba(0, 0, 0, 0.32);
  color: #ecdcc1;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 5px;
  padding: 0.13rem 0.36rem;

  font-family:
    "Iosevka",
    "Cascadia Code",
    "Consolas",
    monospace;
  font-size: 0.92em;
}

pre {
  background: rgba(0, 0, 0, 0.38);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  overflow-x: auto;

  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
}

/* ---------- Blockquote ---------- */

blockquote {
  margin: 1.4rem 0;
  padding: 0.35rem 1.1rem;

  color: var(--text-soft);
  background: rgba(215, 180, 106, 0.06);
  border-left: 3px solid var(--accent-soft);
  border-radius: 0 10px 10px 0;
}

blockquote p {
  margin: 0.7rem 0;
}

/* ---------- Tables ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.96rem;
}

th, td {
  border: 1px solid var(--glass-border);
  padding: 0.55rem 0.7rem;
}

th {
  background: rgba(255, 255, 255, 0.08);
  color: #f0dfc5;
  font-weight: 500;
}

td {
  background: rgba(255, 255, 255, 0.035);
}

/* ---------- Images ---------- */

img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

.page-content img {
  display: block;
  margin: 1.4rem auto;
  border: 1px solid var(--glass-border);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.34);
}

/* ---------- Blog Posts ---------- */

.post-list {
  display: grid;
  gap: 1rem;
  margin: 1.2rem 0 0;
}

.post-card {
  display: grid;
  grid-template-columns: minmax(10rem, 15rem) minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
}

.post-card-cover,
.post-card-cover:visited {
  display: block;
  min-height: 100%;
  overflow: hidden;
  color: var(--text);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  text-decoration: none;
}

.post-card-cover:hover {
  text-decoration: none;
}

.post-card-cover img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  margin: 0;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.post-card-body {
  min-width: 0;
}

.post-card-title {
  margin: 0 0 0.25rem;
  padding: 0;
  border: 0;
  font-size: 1.35rem;
}

.post-card-title a,
.post-card-title a:visited {
  color: var(--text);
}

.post-card-title a:hover {
  color: var(--link-hover);
}

.post-excerpt {
  margin: 0.45rem 0 0;
  color: var(--text-soft);
  font-size: 0.98rem;
}

.post-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0.4rem 0 1.2rem;
}

.post-actions-bottom {
  margin: 2rem 0 0;
}

.blog-pdf-embed {
  display: block;
  width: 100%;
  min-height: 44rem;
  margin: 1.2rem 0;
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.34);
}

.post-cover {
  margin: 1.2rem 0 1.8rem;
}

.post-cover img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  margin: 0;
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.34);
}

.post-cover figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
  text-align: center;
}

/* ---------- Horizontal Rule ---------- */

hr {
  border: none;
  border-top: 1px solid var(--glass-border);
  margin: 2.2rem 0;
}

/* ---------- MathJax ---------- */

mjx-container {
  color: var(--text);
}

mjx-container[display="true"] {
  margin: 1.4rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 2rem;

  background: rgba(10, 12, 18, 0.56);
  border-top: 1px solid var(--glass-border);
  color: var(--muted);

  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.footer-heading,
.site-footer h2 {
  color: var(--text-soft);
}

.site-footer a {
  color: var(--link);
}

/* ---------- Selection ---------- */

::selection {
  background: rgba(215, 180, 106, 0.32);
  color: #fff5e6;
}

/* ---------- Mobile ---------- */

@media screen and (max-width: 720px) {
body {
  background:
    linear-gradient(rgba(7, 8, 13, 0.62), rgba(7, 8, 13, 0.82)),
    url("/assets/images/background.jpg") center center / cover fixed no-repeat;
}

  .wrapper,
  .container,
  .page-content,
  main {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .page-content {
    margin-top: 1.2rem;
    border-radius: 14px;
  }

  h1 {
    font-size: 1.85rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  .note-card,
  .post-card,
  .card,
  .notes-list li,
  .pdf-list li {
    padding: 0.85rem 0.95rem;
  }

  .post-card {
    grid-template-columns: 1fr;
  }

  .post-card-cover img {
    aspect-ratio: 16 / 9;
  }

  .music-player {
    right: 0.65rem;
    bottom: 0.65rem;
    width: calc(100vw - 1.3rem);
    padding: 0.75rem;
  }

  .music-player-launcher {
    right: 0.65rem;
    bottom: 0.65rem;
  }

  .music-player-header {
    align-items: flex-start;
    gap: 0.6rem;
  }

  .music-window-actions {
    gap: 0.35rem;
  }

  .music-play-button {
    min-width: 4.4rem;
  }

  .music-controls {
    align-items: center;
    flex-direction: row;
  }

  .music-list {
    max-height: 11rem;
  }
}