:root {
  --color-bg: #f3f4f6;
  --color-surface: #fbfcfe;
  --color-surface-muted: #e3e8ee;
  --color-text: #1f2730;
  --color-text-muted: #4a5a6a;
  --color-text-subtle: #5f6f80;
  --color-border: #c9d4df;
  --color-border-soft: #dce4ec;
  --color-accent: #2a5d8f;
  --color-accent-strong: #214c75;
  --color-accent-contrast: #f4f8fc;
  --color-error: #a53f3f;
  --shadow-sm: 0 2px 6px rgba(22, 34, 48, 0.1);
  --shadow-md: 0 8px 22px rgba(22, 34, 48, 0.12);
  --focus-ring: 0 0 0 3px rgba(42, 93, 143, 0.3);
}

:root[data-theme="dark"] {
  --color-bg: #10161d;
  --color-surface: #1b2632;
  --color-surface-muted: #243241;
  --color-text: #edf3fa;
  --color-text-muted: #c7d4e3;
  --color-text-subtle: #acc2d8;
  --color-border: #3e5165;
  --color-border-soft: #334455;
  --color-accent: #77b3f0;
  --color-accent-strong: #9ac7f6;
  --color-accent-contrast: #0d1a28;
  --color-error: #ee8787;
  --shadow-sm: 0 2px 8px rgba(5, 10, 15, 0.45);
  --shadow-md: 0 10px 28px rgba(5, 10, 15, 0.5);
  --focus-ring: 0 0 0 3px rgba(119, 179, 240, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #10161d;
    --color-surface: #1b2632;
    --color-surface-muted: #243241;
    --color-text: #edf3fa;
    --color-text-muted: #c7d4e3;
    --color-text-subtle: #acc2d8;
    --color-border: #3e5165;
    --color-border-soft: #334455;
    --color-accent: #77b3f0;
    --color-accent-strong: #9ac7f6;
    --color-accent-contrast: #0d1a28;
    --color-error: #ee8787;
    --shadow-sm: 0 2px 8px rgba(5, 10, 15, 0.45);
    --shadow-md: 0 10px 28px rgba(5, 10, 15, 0.5);
    --focus-ring: 0 0 0 3px rgba(119, 179, 240, 0.35);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New", monospace;
}

.main_cont,
.header_main_cont,
.lect_notes_main_cont {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.main_cont {
  min-height: 100dvh;
  background-color: var(--color-bg);
  padding: 1rem;
}

.lect_notes_main_cont {
  flex-direction: column;
  padding-bottom: 2rem;
}

.main_cont_inner,
.header_main_cont_inner,
.lect_notes_main_cont_inner {
  width: min(650px, calc(100% - 2rem));
  min-width: 0;
}

.main_cont_about {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
}

.main_cont_about_inner {
  text-align: right;
  width: 49%;
  height: 100%;
}

.main_cont_text_about_me {
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.main_cont_about img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
}

.main_cont_about_inner h1 {
  font-family: "Roboto", sans-serif;
  font-weight: 700;
  font-size: clamp(1.9rem, 3.2vw, 2.25rem);
}

.main_cont_about_inner h2 {
  font-family: "Roboto", sans-serif;
  font-weight: 300;
  font-size: clamp(1.1rem, 2.6vw, 1.5rem);
  color: var(--color-text-muted);
}

.main_cont_about_inner_icons {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.main_cont_about_inner a {
  color: var(--color-text);
  font-size: 2rem;
  margin-left: 0.5rem;
  width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  text-decoration: none;
}

.main_cont_about_inner a i {
  line-height: 1;
  display: inline-block;
  transition: transform 0.2s ease, color 0.2s ease;
}

.main_cont_about_inner a:hover i,
.main_cont_about_inner a:focus-visible i {
  transform: scale(1.12);
  color: var(--color-accent);
}

.main_cont_about_inner .cv_icon_text {
  font-family: "Roboto", sans-serif;
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: 0.2px;
  width: 100%;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, color 0.2s ease;
}

.main_cont_about_inner .cv_icon_text:hover,
.main_cont_about_inner a:focus-visible .cv_icon_text {
  transform: scale(1.06);
  color: var(--color-accent);
}

.main_cont_routs {
  width: 100%;
  background-color: var(--color-surface-muted);
  margin-top: 1rem;
  padding: 0.5rem 0.75rem;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.3rem;
  border-radius: 14px;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  width: 44px;
  min-height: 44px;
  border-radius: 9px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

.main_brand {
  order: 1;
  margin-right: 0.4rem;
}

.main_nav_links {
  order: 2;
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: auto;
}

.main_cont_routs .main_header_a {
  position: relative;
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.2s ease;
  padding: 0.5rem 0.6rem;
  min-height: 44px;
  line-height: 1.15;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  font-family: "Roboto", sans-serif;
  font-weight: 700;
  font-size: 0.93rem;
}

.main_cont_routs .main_header_a:hover,
.main_cont_routs .main_header_a:focus-visible {
  color: var(--color-accent);
}

.main_cont_routs .main_header_a::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: 0.6rem;
  right: 0.6rem;
  height: 2px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

.main_cont_routs .main_header_a:hover::after,
.main_cont_routs .main_header_a:focus-visible::after,
.main_cont_routs .main_cont_routs_active::after {
  transform: scaleX(1);
}

.theme-toggle {
  order: 3;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  width: 44px;
  min-height: 44px;
  padding: 0;
  margin-left: 0.35rem;
  border-radius: 9px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

.nav-toggle i,
.theme-toggle i {
  font-size: 1rem;
  line-height: 1;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 650px) {
  .main_cont {
    padding: 0.75rem;
  }

  .main_cont_inner {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .main_cont_about {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
    width: 100%;
  }

  .main_cont_about img {
    width: 150px;
    height: 150px;
  }

  .main_cont_about_inner {
    width: 100%;
    text-align: center;
  }

  .main_cont_text_about_me {
    width: 100%;
    min-height: 0;
  }

  .main_cont_about_inner_icons {
    margin-top: 0.5rem;
    justify-content: center;
  }

  .main_cont_about_inner h1 {
    margin-top: 0.25rem;
    font-size: 1.65rem;
  }

  .main_cont_about_inner h2 {
    margin-top: 0.25rem;
    font-size: 1rem;
  }

  .main_cont_routs {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    align-items: center;
    width: 100%;
    padding: 0.35rem;
    gap: 0.25rem;
  }

  .nav-toggle {
    display: inline-flex;
    grid-column: 1;
    order: 0;
  }

  .main_brand {
    grid-column: 2;
    margin-right: 0;
    justify-self: center;
    width: auto;
    font-size: 0.95rem;
    padding: 0.45rem 0.3rem;
  }

  .main_cont_routs .main_brand::after {
    left: 0.3rem;
    right: 0.3rem;
  }

  .theme-toggle {
    grid-column: 3;
    width: 44px;
    justify-self: end;
    margin-left: 0;
  }

  .main_nav_links {
    grid-column: 1 / -1;
    order: 4;
    margin-left: 0;
    margin-top: 0.25rem;
    display: none;
    flex-direction: column;
    gap: 0.2rem;
    width: 100%;
  }

  .main_cont_routs[data-menu-open="true"] .main_nav_links {
    display: flex;
  }

  .main_nav_links .main_header_a {
    width: 100%;
    justify-content: center;
    padding: 0.45rem 0.35rem;
    font-size: 0.84rem;
  }
}

.header_main_cont {
  margin-top: 1rem;
}

.lect_notes_main_cont_inner {
  padding: 0 1rem;
  text-align: left;
}

.lect_notes_page-title {
  margin-top: 1rem;
  font-size: clamp(2rem, 5vw, 2.25rem);
  text-align: center;
  color: var(--color-text);
}

.lect_notes_page-sub_title {
  font-size: clamp(1.2rem, 3.6vw, 1.5rem);
  text-align: center;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
}

.section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: clamp(1.45rem, 4.2vw, 1.75rem);
  margin-bottom: 1rem;
  color: var(--color-text-muted);
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.25rem;
}

.subsection {
  margin-bottom: 1.5rem;
}

.subsection-title {
  font-size: clamp(1.2rem, 3.8vw, 1.4rem);
  color: var(--color-text-subtle);
  margin-bottom: 0.75rem;
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.note-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: 10px;
  padding: 1.25rem;
  box-shadow: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.note-card:hover,
.note-card:focus-within {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-border));
  box-shadow: var(--shadow-sm);
}

.note-content h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.note-link {
  font-size: 0.95rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  padding: 0.35rem 0;
  transition: color 0.2s ease;
}

.note-link:hover,
.note-link:focus-visible {
  color: var(--color-accent);
}

.note-link[aria-disabled="true"] {
  pointer-events: none;
  color: var(--color-text-subtle);
  text-decoration: none;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.5rem;
  }

  .subsection-title {
    font-size: 1.25rem;
  }
}

@media (max-width: 420px) {
  .lect_notes_main_cont_inner {
    padding: 0 0.75rem;
  }

  .notes-grid {
    grid-template-columns: 1fr;
  }
}

.lect_notes_content-container,
.lect_notes_sections {
  width: 100%;
  display: block;
}

.lect_notes_content-container {
  display: block;
}

.table-of-contents {
  margin: 1rem 0;
  padding: 0.35rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 1rem;
  z-index: 12;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 44px;
  gap: 0.25rem;
  align-items: center;
}

.table-of-contents .toc-menu-toggle {
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  width: 44px;
  min-height: 44px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.table-of-contents .toc-menu-toggle:hover,
.table-of-contents .toc-menu-toggle:focus-visible {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

.table-of-contents .toc-current-subject {
  margin: 0;
  text-align: center;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  text-transform: none;
  letter-spacing: normal;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-shell-spacer {
  width: 44px;
  min-height: 44px;
}

.table-of-contents ul {
  list-style: none;
  margin: 0;
  padding: 5px;
  position: absolute;
  top: calc(100% + 5px);
  left: 0;
  right: 0;
  display: none;
  flex-direction: column;
  gap: 0.2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  max-height: min(65vh, 420px);
  overflow-y: auto;
}

.table-of-contents[data-menu-open="true"] ul {
  display: flex;
}

.table-of-contents li {
  margin: 0;
}

.table-of-contents ul button {
  width: 100%;
  min-height: 44px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text);
  border-radius: 10px;
  text-align: center;
  padding: 0.5rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.table-of-contents ul button:hover,
.table-of-contents ul button:focus-visible {
  color: var(--color-accent);
  background-color: var(--color-surface-muted);
  border-color: transparent;
}

.table-of-contents ul button.is-active {
  color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-surface) 85%, var(--color-accent) 15%);
  border-color: transparent;
}

@media (min-width: 981px) {
  .table-of-contents {
    position: static;
    top: auto;
    z-index: auto;
    display: block;
    padding: 5px;
  }

  .table-of-contents .toc-menu-toggle,
  .table-of-contents .toc-current-subject,
  .table-of-contents .toc-shell-spacer {
    display: none;
  }

  .table-of-contents ul {
    position: static;
    top: auto;
    left: auto;
    right: auto;
    margin: 0;
    padding: 5px;
    display: flex;
    border: none;
    box-shadow: none;
    max-height: none;
    overflow: visible;
  }

  .table-of-contents ul button {
    text-align: left;
  }

  .table-of-contents.is-compact {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: min(650px, calc(100% - 2rem));
    margin: 0;
    z-index: 24;
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    gap: 0.25rem;
    align-items: center;
    padding: 0.35rem;
  }

  .table-of-contents.is-compact .toc-menu-toggle {
    display: inline-flex;
  }

  .table-of-contents.is-compact .toc-current-subject {
    display: block;
  }

  .table-of-contents.is-compact .toc-shell-spacer {
    display: block;
  }

  .table-of-contents.is-compact ul {
    position: absolute;
    top: calc(100% + 5px);
    left: 0;
    right: 0;
    display: none;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border-soft);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    max-height: min(60vh, 420px);
    overflow-y: auto;
  }

  .table-of-contents.is-compact[data-menu-open="true"] ul {
    display: flex;
  }

  .table-of-contents.is-compact ul button {
    text-align: center;
  }
}

.toc-compact-placeholder {
  width: 100%;
}

.lect_notes_sections {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  margin-top: 1.5rem;
}

.lect_notes_sections .section {
  margin-bottom: 0;
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}

.section-kicker {
  margin-bottom: 0.25rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  opacity: 0.8;
}

.lect_notes_sections .section-title {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border-soft);
  padding-bottom: 0.75rem;
  color: var(--color-text);
  font-weight: 500;
  font-size: 1.6rem;
}

.lect_notes_sections .subsection {
  margin-bottom: 1.15rem;
}

.lect_notes_sections .subsection:last-child {
  margin-bottom: 0;
}

.subsection-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.subsection-count {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  border: 1px solid var(--color-border-soft);
  background-color: transparent;
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  opacity: 0.8;
}

.lect_notes_sections .notes-grid {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.lect_notes_sections .note-card {
  border-radius: 12px;
  border-color: var(--color-border-soft);
  min-height: 150px;
}

.lect_notes_sections .note-content {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.note-meta {
  margin: 0 0 0.55rem;
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
}

.lect_notes_sections .note-link {
  margin-top: auto;
  background-color: transparent;
  border: none;
  padding: 0;
  min-height: auto;
  font-weight: 500;
  color: var(--color-accent);
}

.lect_notes_sections .note-link::after {
  content: "→";
  margin-left: 0.35rem;
  font-size: 0.95rem;
  transition: transform 0.2s ease;
}

.lect_notes_sections .note-card:hover .note-link::after,
.lect_notes_sections .note-link:focus-visible::after {
  transform: translateX(3px);
}

.lect_notes_sections .note-link[aria-disabled="true"] {
  border-color: var(--color-border-soft);
  background-color: var(--color-surface);
}

.lecture-notes-status {
  max-width: 460px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  border: 1px solid color-mix(in srgb, var(--color-accent) 22%, var(--color-border));
  background-color: color-mix(in srgb, var(--color-surface) 88%, var(--color-accent) 12%);
}

.lecture-notes-status.error {
  border-color: color-mix(in srgb, var(--color-error) 42%, var(--color-border));
  background-color: color-mix(in srgb, var(--color-surface) 88%, var(--color-error) 12%);
}

@media (max-width: 980px) {
  .table-of-contents {
    position: sticky;
    top: 1rem;
    z-index: 16;
  }

  .table-of-contents ul {
    max-height: min(65vh, 420px);
    overflow-y: auto;
  }

  .table-of-contents .toc-current-subject {
    font-size: 0.88rem;
  }
}

@media (max-width: 560px) {
  .subsection-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

.contactme-page {
  text-align: left;
}

.contactme-page .lect_notes_page-sub_title {
  margin-bottom: 1rem;
}

.contactme-sections {
  display: flex;
  flex-direction: column;
  gap: 2.6rem;
  margin-top: 1.5rem;
}

.contactme-section {
  margin: 0;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid var(--color-border-soft);
}

.contactme-sections .contactme-section:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.contactme-section-title {
  margin: 0 0 0.85rem;
  padding-bottom: 0;
  border-bottom: none;
  font-size: clamp(1.35rem, 3.7vw, 1.55rem);
  color: var(--color-text);
  font-weight: 500;
}

.contact-description {
  margin: 0 0 0.95rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.contact-details {
  margin: 0;
  display: grid;
  gap: 0.72rem;
}

.contact-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: start;
  gap: 0.7rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--color-border-soft);
  border-radius: 12px;
  background-color: var(--color-surface);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-item:hover,
.contact-item:focus-within {
  transform: translateY(-1px);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.contact-item i {
  width: 36px;
  min-height: 36px;
  border-radius: 10px;
  border: 1px solid var(--color-border-soft);
  background-color: color-mix(in srgb, var(--color-surface) 86%, var(--color-accent) 14%);
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.contact-item-content {
  min-width: 0;
}

.contact-label {
  margin: 0 0 0.18rem;
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
}

.contact-item a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.contact-item a:hover,
.contact-item a:focus-visible {
  text-decoration: underline;
  color: var(--color-accent-strong);
}

.icons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.icons a {
  font-size: 1.5rem;
  color: var(--color-text);
  transition: color 0.2s ease, transform 0.2s ease;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  text-decoration: none;
}

.icons a:hover,
.icons a:focus-visible {
  color: var(--color-accent);
  transform: scale(1.08);
}

.contactme-page .icons {
  justify-content: flex-start;
  gap: 0.6rem;
}

.contactme-page .icons a {
  min-width: 48px;
  min-height: 48px;
  border-radius: 12px;
  border: 1px solid var(--color-border-soft);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.contactme-page .icons a:hover,
.contactme-page .icons a:focus-visible {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.map-container {
  margin-top: 2rem;
}

.map-container h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.map-container iframe {
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.name_about_me {
  margin: 0 0 0.35rem;
  text-align: left;
  font-size: clamp(1.35rem, 3.4vw, 1.8rem);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.lisn-link {
  color: var(--color-accent);
  text-decoration: none;
}

.lisn-link:hover,
.lisn-link:focus-visible {
  color: var(--color-accent-strong);
  text-decoration: underline;
}

.aboutme-page {
  text-align: left;
}

.aboutme-page .lect_notes_page-sub_title {
  margin-bottom: 1rem;
}

.aboutme-sections {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  margin-top: 1.5rem;
}

.aboutme-section {
  margin: 0;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--color-border-soft);
}

.aboutme-sections .aboutme-section:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.first-text-about-me {
  margin-top: 0;
}

.aboutme-section-title {
  margin: 0 0 0.85rem;
  padding-bottom: 0;
  border-bottom: none;
  font-size: clamp(1.35rem, 3.7vw, 1.55rem);
  color: var(--color-text);
  font-weight: 500;
}

.aboutme-text {
  font-size: 1rem;
  line-height: 1.62;
  color: var(--color-text-muted);
  margin: 0 0 0.72rem;
}

.aboutme-text:last-child {
  margin-bottom: 0;
}

.aboutme-text p {
  margin: 0 0 0.72rem;
}

.aboutme-text p:last-child {
  margin-bottom: 0;
}

.aboutme-section a {
  color: var(--color-accent);
}

.aboutme-section a:hover,
.aboutme-section a:focus-visible {
  color: var(--color-accent-strong);
}

.projects-container {
  display: grid;
  gap: 0.8rem;
}

.project-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--color-border-soft);
  border-radius: 12px;
  background-color: var(--color-surface);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.project-item:hover,
.project-item:focus-within {
  transform: translateY(-1px);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.project-info {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text-muted);
}

.project-info strong {
  color: var(--color-text);
}

.project-link {
  text-decoration: none;
  color: var(--color-accent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, var(--color-border));
  background-color: color-mix(in srgb, var(--color-surface) 85%, var(--color-accent) 15%);
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.project-link::after {
  content: "↗";
  margin-left: 0.35rem;
  font-size: 0.9rem;
}

.project-link:hover,
.project-link:focus-visible {
  color: var(--color-accent-contrast);
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.dj_photo {
  width: min(100%, 520px);
  border-radius: 12px;
  border: 1px solid var(--color-border-soft);
}

.dj_div {
  padding-top: 0.4rem;
  width: 100%;
  display: block;
}

.dj_inner {
  width: 100%;
  display: flex;
  justify-content: center;
}

.dj_div-caption {
  margin-top: 0.45rem;
  text-align: center;
  color: var(--color-text-subtle);
  font-size: 0.92rem;
}

@media (max-width: 768px) {
  .aboutme-sections {
    gap: 2.2rem;
  }

  .name_about_me {
    font-size: clamp(1.25rem, 5vw, 1.55rem);
  }

  .aboutme-text,
  .project-info {
    font-size: 0.96rem;
  }

  .project-item {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .project-info {
    margin-bottom: 0.35rem;
    text-align: center;
  }

  .project-link {
    min-width: 100%;
  }

  .contactme-sections {
    gap: 2rem;
  }

  .contact-item {
    grid-template-columns: 36px minmax(0, 1fr);
    padding: 0.75rem 0.8rem;
  }

  .contactme-page .icons {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .dj_photo {
    width: 97%;
  }
}

.main-text {
  font-weight: 800;
  font-size: 1.8rem;
}

.lecture-notes-status {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.lecture-notes-status.error {
  color: var(--color-error);
}

a:focus-visible,
button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}