:root {
--bg: #f7fbff;
--white: #ffffff;
--blue: #4f8fc9;
--blue-dark: #285f91;
--blue-light: #eaf4fc;
--text: #172330;
--muted: #617385;
--border: #dceaf5;
}

* {
  box-sizing: border-box;
  }

html {
scroll-behavior: smooth;
}

body {
margin: 0;
background: var(--bg);
color: var(--text);
font-family:
-apple-system,
BlinkMacSystemFont,
"Segoe UI",
Helvetica,
Arial,
sans-serif;
line-height: 1.65;
}

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

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

nav {
position: sticky;
top: 0;
z-index: 100;

background: rgba(247, 251, 255, 0.92);
backdrop-filter: blur(10px);

border-bottom: 1px solid var(--border);
}

.nav-inner {
max-width: 1050px;
margin: 0 auto;

padding: 18px 28px;

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

.logo {
font-size: 18px;
font-weight: 700;
letter-spacing: -0.02em;
color: var(--blue-dark);
}

.nav-links {
display: flex;
gap: 28px;
font-size: 14px;
color: var(--muted);
}

.nav-links a {
transition: color 0.2s ease;
}

.nav-links a:hover {
color: var(--blue-dark);
}

/* -------------------------
Main layout
------------------------- */

main {
max-width: 900px;
margin: 0 auto;
padding: 0 28px;
}

section {
padding: 100px 0;
border-bottom: 1px solid var(--border);
}

section:last-child {
border-bottom: none;
}

/* -------------------------
Hero / About
------------------------- */

.hero {
min-height: 80vh;

display: flex;
flex-direction: column;
justify-content: center;
}

.eyebrow {
color: var(--blue);
font-size: 14px;
font-weight: 700;
letter-spacing: 0.08em;
text-transform: uppercase;

margin-bottom: 14px;
}

h1 {
font-size: clamp(48px, 8vw, 78px);
line-height: 0.98;
letter-spacing: -0.055em;

margin: 0 0 28px;
max-width: 750px;
}

.hero h3 {
margin: 0 0 20px;
}

.hero-description {
max-width: 650px;

font-size: 21px;
line-height: 1.6;
color: var(--muted);

margin: 0;
}

.hero-description strong {
color: var(--text);
}

/* -------------------------
Section headings
------------------------- */

.section-header {
display: grid;
grid-template-columns: 180px 1fr;
gap: 50px;

margin-bottom: 55px;
}

.section-number {
font-size: 13px;
color: var(--blue);

text-transform: uppercase;
letter-spacing: 0.1em;
font-weight: 700;
}

h2 {
margin: 0;

font-size: 38px;
line-height: 1.1;
letter-spacing: -0.04em;
}

.section-intro {
color: var(--muted);
margin-top: 12px;
font-size: 16px;
}

/* -------------------------
About
------------------------- */

.about-grid {
display: grid;
grid-template-columns: 1.5fr 1fr;
gap: 60px;
}

.about-text {
font-size: 18px;
}

.about-text p {
margin-top: 0;
margin-bottom: 22px;
}

.profile-photo {
width: 100%;
height: auto;
display: block;

border: 1px solid var(--border);
border-radius: 12px;
}

/* -------------------------
Experience
------------------------- */

.experience-list {
display: flex;
flex-direction: column;
}

.experience-item {
display: grid;
grid-template-columns: 1fr auto;

padding: 30px 0;

border-top: 1px solid var(--border);
}

.experience-item:first-child {
border-top: none;
padding-top: 0;
}

.experience-company {
font-size: 19px;
font-weight: 700;

margin-bottom: 3px;
}

.experience-role {
color: var(--muted);
font-size: 15px;
}

.experience-description {
max-width: 620px;
margin-top: 12px;

color: var(--muted);
font-size: 15px;
}

.experience-date {
color: var(--muted);
font-size: 14px;
white-space: nowrap;
padding-left: 30px;
}

/* -------------------------
Research
------------------------- */

.research-list {
display: flex;
flex-direction: column;
gap: 45px;
}

.research-item {
display: grid;
grid-template-columns: 90px 1fr;
gap: 30px;
}

.research-year {
color: var(--blue);
font-size: 14px;
font-weight: 700;
}

.research-title {
font-size: 20px;
font-weight: 700;
margin-bottom: 8px;
}

.research-description {
color: var(--muted);
font-size: 15px;
margin: 0;
}

/* -------------------------
Writing
------------------------- */

.writing-list {
display: flex;
flex-direction: column;
}

.writing-item {
display: grid;
grid-template-columns: 100px 1fr auto;
gap: 20px;

align-items: center;

padding: 22px 0;

border-top: 1px solid var(--border);
}

.writing-item:first-child {
border-top: none;
padding-top: 0;
}

.writing-date {
color: var(--muted);
font-size: 14px;
}

.writing-title {
font-size: 17px;
font-weight: 600;
}

.writing-arrow {
color: var(--blue);
font-size: 20px;

transition:
transform 0.2s ease,
color 0.2s ease;
}

.writing-item:hover .writing-arrow {
transform: translateX(5px);
color: var(--blue-dark);
}

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

footer {
max-width: 900px;
margin: 0 auto;

padding: 45px 28px 60px;

display: flex;
justify-content: space-between;

color: var(--muted);
font-size: 14px;
}

.footer-links {
display: flex;
gap: 20px;
}

.footer-links a:hover {
color: var(--blue-dark);
}

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

@media (max-width: 700px) {
.nav-inner {
padding: 16px 20px;
}

.nav-links {
gap: 14px;
font-size: 12px;
}

main {
padding: 0 20px;
}

section {
padding: 75px 0;
}

.hero {
min-height: 75vh;
}

.hero-description {
font-size: 18px;
}

.section-header {
display: block;
margin-bottom: 35px;
}

.section-number {
margin-bottom: 10px;
}

h2 {
font-size: 32px;
}

.about-grid {
grid-template-columns: 1fr;
gap: 35px;
}

.profile-photo {
max-width: 300px;
}

.experience-item {
grid-template-columns: 1fr;
gap: 8px;
}

.experience-date {
padding-left: 0;
order: -1;
}

.research-item {
grid-template-columns: 1fr;
gap: 5px;
}

.writing-item {
grid-template-columns: 75px 1fr auto;
gap: 12px;
}

.writing-title {
font-size: 15px;
}

footer {
padding-left: 20px;
padding-right: 20px;


flex-direction: column;
gap: 15px;


}
}

/* -------------------------
404 Page
------------------------- */

.error {
min-height: 70vh;

display: flex;
flex-direction: column;
justify-content: center;
}

.error-code {
color: var(--blue);
font-size: 14px;
font-weight: 700;
letter-spacing: 0.1em;
text-transform: uppercase;

margin-bottom: 14px;
}

.error h1 {
font-size: clamp(48px, 8vw, 78px);
line-height: 0.98;
letter-spacing: -0.055em;

margin: 0 0 28px;
}

.message {
max-width: 600px;

color: var(--muted);
font-size: 20px;
line-height: 1.6;

margin: 0 0 30px;
}

.back-link {
color: var(--blue-dark);
font-size: 16px;
font-weight: 600;

width: fit-content;

transition:
color 0.2s ease,
transform 0.2s ease;
}

.back-link:hover {
color: var(--blue);
transform: translateX(-4px);
}

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

@media (max-width: 700px) {
.error {
min-height: 70vh;
}

.message {
font-size: 18px;
}
}

/* -------------------------
Writing / Article Page
------------------------- */

article {
max-width: 750px;
margin: 0 auto;
padding: 100px 0;
}

/* -------------------------
Article Header
------------------------- */

.article-header {
padding-bottom: 55px;
border-bottom: 1px solid var(--border);
}

.article-type {
color: var(--blue);
font-size: 13px;
font-weight: 700;

text-transform: uppercase;
letter-spacing: 0.1em;

margin-bottom: 18px;
}

.article-header h1 {
margin: 0 0 20px;

font-size: clamp(42px, 7vw, 68px);
line-height: 1.05;
letter-spacing: -0.05em;
}

.metadata {
color: var(--muted);
font-size: 14px;
}

/* -------------------------
Article Body
------------------------- */

.article-body {
padding-top: 55px;

font-size: 18px;
line-height: 1.8;
}

.article-body p {
margin: 0 0 28px;
}

.article-body h2 {
margin: 65px 0 25px;

font-size: 32px;
line-height: 1.15;
letter-spacing: -0.035em;
}

.article-body h2:first-child {
margin-top: 0;
}

/* -------------------------
Blockquotes
------------------------- */

.article-body blockquote {
margin: 40px 0;

padding: 5px 0 5px 25px;

border-left: 3px solid var(--blue);

color: var(--muted);

font-size: 19px;
font-style: italic;
line-height: 1.7;
}

/* -------------------------
Citations
------------------------- */

.citation {
color: var(--blue-dark);
font-size: 0.8em;
font-weight: 700;

text-decoration: none;

transition: color 0.2s ease;
}

.citation:hover {
color: var(--blue);
}

/* -------------------------
References
------------------------- */

.references {
margin-top: 80px;
padding-top: 45px;

border-top: 1px solid var(--border);
}

.references h2 {
margin-bottom: 25px;
}

.references ol {
margin: 0;
padding-left: 25px;

color: var(--muted);
font-size: 15px;
}

.references li {
padding: 8px 0;
padding-left: 5px;
}

.references a {
color: var(--blue-dark);

transition: color 0.2s ease;
}

.references a:hover {
color: var(--blue);
}

.reference-number {
margin-right: 8px;

font-weight: 700;
}

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

.article-end {
margin-top: 60px;
padding-top: 30px;

border-top: 1px solid var(--border);
}

.back-link {
display: inline-block;

color: var(--blue-dark);
font-size: 16px;
font-weight: 600;

transition:
color 0.2s ease,
transform 0.2s ease;
}

.back-link:hover {
color: var(--blue);
transform: translateX(-4px);
}

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

@media (max-width: 700px) {
article {
padding: 70px 0;
}

.article-header {
padding-bottom: 40px;
}

.article-header h1 {
font-size: 44px;
}

.article-body {
padding-top: 40px;

```
font-size: 17px;
line-height: 1.75;
```

}

.article-body h2 {
margin-top: 50px;
font-size: 29px;
}

.article-body blockquote {
margin: 30px 0;
padding-left: 20px;

```
font-size: 17px;
```

}

.references {
margin-top: 60px;
padding-top: 35px;
}
}

.password-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  box-sizing: border-box;
}

.password-box {
  width: 100%;
  max-width: 460px;
  background: var(--white);
  border: 1px solid var(--border);
  padding: 3rem;
  box-sizing: border-box;
}

.password-box h1 {
  margin: 0.5rem 0 1rem;
}

.password-box p {
  color: var(--muted);
}

#password-form {
  margin-top: 2rem;
}

#password-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  outline: none;
}

#password-input:focus {
  border-color: var(--blue);
}

#password-form button {
  margin-top: 0.75rem;
  padding: 0.75rem 1.25rem;
  border: none;
  background: var(--blue);
  color: white;
  font: inherit;
  cursor: pointer;
}

#password-form button:hover {
  background: var(--blue-dark);
}

#password-error {
  color: #b33;
  margin-top: 0.75rem;
}

#protected-content {
    display: none;
}