/* ============================================
   Francesco Castagna — Personal Site
   Clean, minimal design
   ============================================ */

/* ---------- CFU Serif Font ---------- */
/* Place your CFU Serif font files in blog/fonts/ and uncomment:
@font-face {
  font-family: 'CFU Serif';
  src: url('../fonts/CFUSerif-Regular.woff2') format('woff2'),
       url('../fonts/CFUSerif-Regular.woff') format('woff');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'CFU Serif';
  src: url('../fonts/CFUSerif-Bold.woff2') format('woff2'),
       url('../fonts/CFUSerif-Bold.woff') format('woff');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'CFU Serif';
  src: url('../fonts/CFUSerif-Italic.woff2') format('woff2'),
       url('../fonts/CFUSerif-Italic.woff') format('woff');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}
*/

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-link: #1a1a1a;
  --color-link-hover: #000000;
  --color-border: #e0e0e0;
  --color-bg-footer: #fafafa;
  --color-btn-border: #1a1a1a;
  --color-btn-hover-bg: #1a1a1a;
  --color-btn-hover-text: #ffffff;
  --font-serif: 'CFU Serif', 'Georgia', 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --max-width: 680px;
}

/* ---------- Night Shift (Dark Mode) ---------- */
[data-theme="dark"] {
  --color-bg: #111111;
  --color-text: #e0e0e0;
  --color-text-secondary: #999999;
  --color-link: #e0e0e0;
  --color-link-hover: #ffffff;
  --color-border: #2a2a2a;
  --color-bg-footer: #0d0d0d;
  --color-btn-border: #e0e0e0;
  --color-btn-hover-bg: #e0e0e0;
  --color-btn-hover-text: #111111;
  --color-code-bg: #1a1a1a;
  --color-code-text: #d4d4d4;
}

[data-theme="dark"] ::selection {
  background: rgba(255, 255, 255, 0.12);
}

/* ---------- Night Shift Toggle (Apple-style switch) ---------- */
.night-toggle {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 1000;
  width: 48px;
  height: 26px;
  background: #ccc;
  border: none;
  border-radius: 13px;
  cursor: pointer;
  padding: 0;
  transition: background-color 0.3s ease;
}

.night-toggle__knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  line-height: 1;
}

[data-theme="dark"] .night-toggle {
  background: #555;
}

[data-theme="dark"] .night-toggle__knob {
  transform: translateX(22px);
}

.night-toggle__icon--sun,
.night-toggle__icon--moon {
  pointer-events: none;
}

.night-toggle__icon--sun {
  display: none;
}

[data-theme="dark"] .night-toggle__icon--moon {
  display: none;
}

[data-theme="dark"] .night-toggle__icon--sun {
  display: inline;
}

/* ---------- Spinning Name Circle ---------- */
.name-circle {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 1000;
  width: 90px;
  height: 90px;
  text-decoration: none;
  display: block;
}

.name-circle__svg {
  width: 100%;
  height: 100%;
  animation: spin 12s linear infinite;
}

.name-circle__text {
  font-family: var(--font-sans);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 5.6px;
  text-transform: uppercase;
  fill: var(--color-text);
  transition: fill 0.3s ease;
}

.name-circle:hover .name-circle__text {
  fill: var(--color-text-secondary);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Page Fade-In ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  animation: fadeUp 0.5s ease-out both;
}

::selection {
  background: rgba(0, 0, 0, 0.08);
}

/* ---------- Links ---------- */
a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-link-hover);
}

/* ---------- Timeline ---------- */
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline li {
  position: relative;
  padding-left: 28px;
  padding-bottom: 28px;
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
}

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

.timeline li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-secondary);
}

.timeline__year {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  margin-right: 10px;
  color: var(--color-text-secondary);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================
   LANDING PAGE (index.html)
   ========================================== */
.landing {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 100vh;
  padding: 40px 24px;
}

.landing__name {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-bottom: 50px;
  color: var(--color-text);
}

.landing__nav {
  display: flex;
  gap: 24px;
  margin-bottom: 60px;
}

.landing__btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text);
  border: 1.5px solid var(--color-btn-border);
  border-radius: 2px;
  padding: 12px 36px;
  transition: background-color 0.25s ease, color 0.25s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.landing__btn:hover {
  background-color: var(--color-btn-hover-bg);
  color: var(--color-btn-hover-text);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .landing__btn:hover {
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.06);
}

.landing__tagline {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--color-text-secondary);
  letter-spacing: 0.01em;
}

/* ---------- Subscribe ---------- */
.subscribe {
  margin-top: 54px;
  text-align: center;
}

.subscribe__label {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}

.subscribe__form {
  display: flex;
  gap: 0;
  justify-content: center;
  max-width: 380px;
  margin: 0 auto;
}

.subscribe__input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  padding: 11px 16px;
  border: 1.5px solid var(--color-btn-border);
  border-right: none;
  background: transparent;
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s ease;
}

.subscribe__input::placeholder {
  color: #aaa;
}

.subscribe__input:focus {
  border-color: var(--color-text);
}

.subscribe__btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 11px 24px;
  border: 1.5px solid var(--color-btn-border);
  background: var(--color-text);
  color: var(--color-bg);
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.subscribe__btn:hover {
  background: transparent;
  color: var(--color-text);
}

.subscribe__note {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  color: #aaa;
  margin-top: 10px;
}

/* ---------- Subscribe Page ---------- */
.subscribe-page {
  margin-top: 32px;
}

.subscribe-page__form {
  display: flex;
  gap: 0;
  max-width: 420px;
}

.subscribe-page__input {
  flex: 1;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  padding: 12px 16px;
  border: 1.5px solid var(--color-btn-border);
  border-right: none;
  background: transparent;
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s ease;
}

.subscribe-page__input::placeholder {
  color: #aaa;
}

.subscribe-page__input:focus {
  border-color: var(--color-text);
}

.subscribe-page__btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 28px;
  border: 1.5px solid var(--color-btn-border);
  background: var(--color-text);
  color: var(--color-bg);
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.subscribe-page__btn:hover {
  background: transparent;
  color: var(--color-text);
}

/* ---------- AMA ---------- */
.ama {
  margin-top: 0;
  text-align: left;
  width: 100%;
  max-width: 440px;
}

.ama__title {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 10px;
}

.ama__label {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.ama__form {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ama__input,
.ama__textarea {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  padding: 11px 16px;
  border: 1.5px solid var(--color-btn-border);
  border-bottom: none;
  background: transparent;
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s ease;
  resize: none;
}

.ama__textarea {
  border-bottom: none;
  line-height: 1.6;
}

.ama__input::placeholder,
.ama__textarea::placeholder {
  color: #aaa;
}

.ama__input:focus,
.ama__textarea:focus {
  border-color: var(--color-text);
}

.ama__btn {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 24px;
  border: 1.5px solid var(--color-btn-border);
  background: var(--color-text);
  color: var(--color-bg);
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.ama__btn:hover {
  background: transparent;
  color: var(--color-text);
}

/* ==========================================
   INNER PAGES (me, blog, projects)
   ========================================== */

/* ---------- Header / Site Name ---------- */
.site-header {
  padding: 48px 0 16px;
}

.site-header__name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.site-header__name a {
  text-decoration: none;
  color: var(--color-text);
}

.site-header__name a:hover {
  opacity: 0.6;
}

/* ---------- Inner Nav ---------- */
.inner-nav {
  padding: 0 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.inner-nav__list {
  list-style: none;
  display: flex;
  gap: 28px;
}

.inner-nav__link {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color 0.2s ease;
}

.inner-nav__link:hover,
.inner-nav__link--active {
  color: var(--color-text);
}

/* ---------- Page Title ---------- */
.page-header {
  padding: 50px 0 10px;
}

.page-header__title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

/* ---------- Bio / Me Page ---------- */
.bio {
  padding: 30px 0 60px;
}

.bio p {
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 1.3em;
}

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

/* ---------- Post List ---------- */
.section {
  padding: 30px 0 10px;
}

.section__title {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 18px;
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}

.post-list__item {
  margin-bottom: 0;
  padding: 22px 24px;
  border: 1px solid var(--color-border);
  border-bottom: none;
  transition: background-color 0.2s ease;
}

.post-list__item:first-child {
  border-radius: 4px 4px 0 0;
}

.post-list__item:last-child {
  border-bottom: 1px solid var(--color-border);
  border-radius: 0 0 4px 4px;
}

.post-list__item:only-child {
  border-radius: 4px;
  border-bottom: 1px solid var(--color-border);
}

.post-list__item:hover {
  background: rgba(0, 0, 0, 0.015);
}

[data-theme="dark"] .post-list__item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.post-list__item a {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--color-link);
  text-decoration: none;
  line-height: 1.6;
}

.post-list__item a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-list__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 4px;
}

.post-list__date {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--color-text-secondary);
}

.post-list__reading-time {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--color-text-secondary);
}

.post-list__reading-time::before {
  content: '·';
  margin-right: 14px;
}

.post-list__description {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-top: 2px;
  line-height: 1.6;
}

/* ---------- Essay Page ---------- */
.essay-header {
  padding: 50px 0 30px;
}

.essay-header__title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.essay-header__subtitle {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 14px;
}

.essay-header__date {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* ---------- Essay Body ---------- */
.essay-body {
  padding: 10px 0 60px;
}

/* Drop Cap */
.essay-body > p:first-of-type::first-letter,
.essay-body > h2:first-of-type + p::first-letter {
  font-family: var(--font-serif);
  float: left;
  font-size: 3.4em;
  line-height: 0.8;
  padding-right: 8px;
  padding-top: 6px;
  font-weight: 400;
  color: var(--color-text);
}

/* Reading time on essay pages */
.essay-header__reading-time {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  margin-left: 12px;
}

.essay-header__reading-time::before {
  content: '·';
  margin-right: 12px;
}

.essay-body p {
  margin-bottom: 1.4em;
  font-size: 1rem;
  line-height: 1.85;
}

.essay-body h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  margin-top: 2.4em;
  margin-bottom: 0.8em;
  letter-spacing: -0.01em;
}

.essay-body h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  margin-top: 2em;
  margin-bottom: 0.6em;
}

.essay-body ul,
.essay-body ol {
  margin-bottom: 1.4em;
  padding-left: 1.5em;
}

.essay-body li {
  margin-bottom: 0.5em;
  line-height: 1.8;
}

.essay-body blockquote {
  border-left: 2px solid var(--color-border);
  padding-left: 20px;
  margin: 1.8em 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.essay-body img {
  max-width: 100%;
  height: auto;
  margin: 2em 0;
}

.essay-body code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.88em;
  background: var(--color-code-bg, #f5f5f5);
  color: var(--color-code-text, inherit);
  padding: 2px 6px;
  border-radius: 3px;
}

.essay-body pre {
  background: var(--color-code-bg, #f5f5f5);
  color: var(--color-code-text, inherit);
  padding: 20px;
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: 1.6em;
  line-height: 1.5;
}

.essay-body pre code {
  background: none;
  padding: 0;
}

.essay-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5em 0;
}

/* ---------- Tables ---------- */
.essay-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.6em;
  font-size: 0.92rem;
  line-height: 1.6;
}

.essay-body th,
.essay-body td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
}

.essay-body th {
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.essay-body thead {
  border-bottom: 2px solid var(--color-border);
}

.essay-body tbody tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .essay-body tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

.essay-body tbody tr:hover {
  background: rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .essay-body tbody tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.essay-body tbody tr:last-child td {
  border-bottom: none;
}

@media (max-width: 640px) {
  .essay-body table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ---------- Footnotes ---------- */
.footnote-ref {
  font-family: var(--font-sans);
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
  margin-left: 2px;
  text-decoration: none;
  color: var(--color-text-secondary);
}

.footnote-ref:hover {
  text-decoration: underline;
}

.footnotes {
  margin-top: 3em;
  padding-top: 2em;
  border-top: 1px solid var(--color-border);
}

.footnotes__title {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
}

.footnotes ol {
  padding-left: 1.5em;
}

.footnotes li {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.footnote-back {
  margin-left: 6px;
  text-decoration: none;
  font-size: 0.85em;
}

/* ---------- Back to Top ---------- */
.back-to-top {
  text-align: center;
  padding: 30px 0;
  font-family: var(--font-sans);
  font-size: 0.78rem;
}

.back-to-top a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.back-to-top a:hover {
  color: var(--color-text);
}

/* ---------- Essay Navigation (Next / Prev) ---------- */
.essay-nav {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 32px 0 0;
  margin-top: 20px;
  border-top: 1px solid var(--color-border);
}

.essay-nav__link {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
  max-width: 48%;
}

.essay-nav__link:hover {
  color: var(--color-text);
}

.essay-nav__label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  color: var(--color-text-secondary);
}

.essay-nav__title {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  color: var(--color-text);
}

.essay-nav__link:hover .essay-nav__title {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.essay-nav__link--next {
  text-align: right;
  margin-left: auto;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--color-text-secondary);
}

.site-footer__inner a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.site-footer__inner a:hover {
  color: var(--color-text);
}

.site-footer__social {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-footer__social a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.site-footer__social a:hover {
  color: var(--color-text);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .landing__name {
    font-size: 1.8rem;
  }

  .landing__nav {
    flex-direction: column;
    gap: 14px;
  }

  .landing__btn {
    padding: 12px 40px;
  }

  .subscribe__form {
    flex-direction: column;
    max-width: 280px;
  }

  .subscribe__input {
    border-right: 1.5px solid var(--color-btn-border);
    border-bottom: none;
  }

  .subscribe-page__form {
    flex-direction: column;
    max-width: 280px;
  }

  .subscribe-page__input {
    border-right: 1.5px solid var(--color-btn-border);
    border-bottom: none;
  }

  .site-header {
    padding: 32px 0 12px;
  }

  .inner-nav__list {
    gap: 20px;
  }

  .essay-header__title {
    font-size: 1.6rem;
  }

  .page-header__title {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 18px;
  }

  .site-footer__inner {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .name-circle {
    width: 70px;
    height: 70px;
    top: 14px;
    left: 14px;
  }
}