/* ============================================
   disreGUARD — Design System
   Black & white. Underlined links. Rare blue.
   ============================================ */

/* --- Adobe Fonts (Forma DJR Display) --- */
@import url("https://use.typekit.net/placeholder.css");

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

/* --- Custom Properties (Light) --- */
:root {
  --fg: #0a0a0a;
  --fg-secondary: #555;
  --fg-tertiary: #888;
  --bg: #fff;
  --bg-secondary: #fafafa;
  --border: #e0e0e0;
  --border-light: #eee;
  --blue: #1F22E8;
  --blue-hover: #1618b8;

  --font-display: "forma-djr-display", "SF Pro Display", system-ui, sans-serif;
  --font-body: "forma-djr-display", "SF Pro Text", system-ui, sans-serif;
  --font-mono: "SF Mono", "Fira Code", ui-monospace, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 10rem;

  --max-width: 1100px;
  --content-width: 720px;
  --nav-height: 64px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-med: 300ms;

  color-scheme: light dark;
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #ededed;
    --fg-secondary: #a0a0a0;
    --fg-tertiary: #707070;
    --bg: #0a0a0a;
    --bg-secondary: #111;
    --border: #222;
    --border-light: #1a1a1a;
    --blue: #1F22E8;
    --blue-hover: #1618b8;
  }
}

/* --- Base --- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--fg);
  background-color: var(--bg);
}

::selection {
  background: var(--fg);
  color: var(--bg);
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--fg-tertiary);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--duration-fast) var(--ease-out);
}

a:hover {
  text-decoration-color: var(--fg);
}

img {
  max-width: 100%;
  display: block;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--fg);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.35rem); }
h4 { font-size: 1rem; }

p { max-width: 65ch; }

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-logo svg {
  height: 22px;
  width: auto;
  fill: var(--fg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--fg-secondary);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--fg);
}

.nav-links .btn-primary {
  color: #fff;
}

/* Mobile nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--fg);
  margin: 5px 0;
  transition: all var(--duration-med) var(--ease-out);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
    z-index: 110;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    background: var(--bg);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--duration-med) var(--ease-out);
    gap: var(--space-lg);
  }

  .nav-links.is-open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-toggle.is-open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.is-open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

/* --- Home page overrides --- */
.home .container {
  max-width: 850px;
}

.home .hero .container {
  max-width: none;
  padding-left: max(var(--space-lg), calc((100% - 850px) / 2 + var(--space-lg)));
}

/* --- Hero --- */
.hero {
  position: relative;
  margin-top: var(--nav-height);
  overflow: hidden;
  height: min(68vw, calc(100vh - var(--nav-height)));
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center bottom;
  display: block;
}

.hero-content {
  position: absolute;
  bottom: clamp(1rem, 3vw, 2.5rem);
  left: 0;
  right: 0;
}

.hero-title {
  font-size: clamp(2.2rem, 7.5vw, 6.5rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: #0a0a0a;
  margin: 0;
  max-width: none;
}

@media (prefers-color-scheme: dark) {
  .hero-image {
    filter: invert(1);
  }

  .hero-title {
    color: #ededed;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.7rem 1.6rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--duration-med) var(--ease-out);
}

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--blue-hover);
  color: #fff;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--fg);
  text-decoration: none;
}

/* --- Section --- */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--fg-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-description {
  color: var(--fg-secondary);
  font-size: 1.05rem;
}

.section-divider {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* --- Card Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

@media (max-width: 768px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Card --- */
.card {
  border: 1px solid var(--border);
  padding: var(--space-xl);
  transition: border-color var(--duration-med) var(--ease-out);
}

.card:hover {
  border-color: var(--fg-tertiary);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--fg-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
  display: inline-block;
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card h3 a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
}

.card h3 a:hover {
  text-decoration-color: var(--fg);
}

.card p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-meta {
  margin-top: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-tertiary);
}

/* --- Post Card (Blog list) --- */
.post-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 0 var(--space-lg);
  text-decoration: none;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left var(--duration-fast) var(--ease-out);
}

.post-card:hover {
  padding-left: var(--space-md);
}

.post-card-date {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-tertiary);
  letter-spacing: 0.04em;
  text-align: right;
  white-space: nowrap;
}

.post-card-title {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--fg);
  margin: 0;
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--duration-fast) var(--ease-out);
}

.post-card:hover .post-card-title {
  text-decoration-color: var(--fg);
}

.post-card-excerpt {
  grid-column: 1 / -1;
  grid-row: 2;
  color: var(--fg-secondary);
  font-size: 0.95rem;
  margin-top: var(--space-xs);
  max-width: none;
}

@media (max-width: 480px) {
  .post-card {
    display: block;
  }

  .post-card-title {
    margin: var(--space-xs) 0;
  }
}

/* --- Page Header --- */
.page-header {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-2xl);
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header .lead {
  font-size: 1.1rem;
  color: var(--fg-secondary);
  line-height: 1.7;
}

/* --- Author Page --- */
.author-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xl);
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-bio {
  margin-top: var(--space-md);
}

.author-bio p {
  max-width: none;
}

@media (max-width: 480px) {
  .author-header {
    flex-direction: column;
  }
}

/* --- Services --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  border: 1px solid var(--border);
  padding: var(--space-xl);
  transition: border-color var(--duration-med) var(--ease-out);
}

.service-card:hover {
  border-color: var(--fg-tertiary);
}

.service-card h3 {
  margin-bottom: var(--space-sm);
}

.service-card p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
}

.service-card ul {
  margin-top: var(--space-md);
  padding-left: var(--space-lg);
  color: var(--fg-secondary);
  font-size: 0.9rem;
}

.service-card ul li {
  margin-bottom: var(--space-xs);
}

/* --- Blog Post (Single) --- */
.post-single {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl);
}

.post-single-header {
  max-width: var(--content-width);
  margin: 0 auto var(--space-2xl);
}

.post-single-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-tertiary);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-md);
}

.post-byline {
  color: var(--fg-secondary);
  text-decoration: none;
}

.post-byline:hover {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--fg-tertiary);
}

.post-single-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.post-single-header .lead {
  margin-top: var(--space-lg);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--fg-secondary);
  line-height: 1.7;
}

.post-header-rule {
  border: none;
  height: 1px;
  background: var(--border);
  max-width: var(--content-width);
  margin: 0 auto var(--space-2xl);
}

.post-header-rule:has(+ .post-content > :first-child img) {
  display: none;
}

.post-content {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-content img {
  width: calc(100vw - 40px);
  max-width: calc(100vw - 40px);
  margin-left: calc(50% - 50vw + 20px);
  margin-bottom: var(--space-lg);
}

.post-content h2 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.post-content h3 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.post-content p {
  margin-bottom: var(--space-lg);
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
  max-width: none;
}

.post-content ul,
.post-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.post-content li {
  margin-bottom: var(--space-sm);
}

.post-content strong {
  color: var(--fg);
  font-weight: 600;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 0.12em 0.35em;
  color: var(--fg);
}

.post-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  font-size: 0.88rem;
  line-height: 1.6;
}

.post-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.post-content hr,
.detail-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: var(--space-2xl) 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-size: 0.92rem;
  line-height: 1.6;
}

.post-content th,
.post-content td {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border);
  color: var(--fg-secondary);
  vertical-align: top;
}

.post-content th {
  color: var(--fg);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
  border-bottom: 2px solid var(--fg);
}

.post-content tr:last-child td {
  border-bottom: none;
}

.post-content blockquote {
  border-left: 2px solid var(--fg);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

.post-content blockquote p {
  color: var(--fg);
  font-style: italic;
  margin-bottom: 0;
}

.post-content a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-content a:hover {
  text-decoration-color: var(--fg);
}

.post-nav {
  max-width: var(--content-width);
  margin: var(--space-3xl) auto 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.post-nav a {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--fg);
}

/* --- CTA Section --- */
.cta-section {
  background: #fcf9ea;
  color: var(--fg);
  padding: var(--space-3xl) 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.cta-section h2 {
  color: var(--fg);
  margin-bottom: var(--space-md);
}

.cta-section p {
  color: var(--fg-secondary);
  font-size: 1.05rem;
  margin: 0 auto var(--space-xl);
}

@media (prefers-color-scheme: dark) {
  .cta-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
}

.cta-section .btn-primary {
  background: var(--blue);
  color: #fff;
}

.cta-section .btn-primary:hover {
  background: var(--blue-hover);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-logo svg {
  height: 18px;
  width: auto;
  fill: var(--fg);
  opacity: 0.5;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--fg-tertiary);
  text-decoration: none;
}

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

.footer-copy {
  max-width: none;
  font-size: 0.78rem;
  color: var(--fg-tertiary);
  margin-top: var(--space-lg);
  padding: var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease-out),
              transform 0.5s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.stagger > .reveal:nth-child(2) { transition-delay: 80ms; }
.stagger > .reveal:nth-child(3) { transition-delay: 160ms; }
.stagger > .reveal:nth-child(4) { transition-delay: 240ms; }
.stagger > .reveal:nth-child(5) { transition-delay: 320ms; }
.stagger > .reveal:nth-child(6) { transition-delay: 400ms; }

/* --- Tags --- */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--fg-tertiary);
  border: 1px solid var(--border);
  padding: 0.12rem 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- Back link --- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-tertiary);
  text-decoration: none;
  margin-bottom: var(--space-xl);
}

.back-link:hover {
  color: var(--fg);
  text-decoration: none;
}

/* --- Detail Pages (Research/Project) --- */
.detail-single {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-3xl);
}

.detail-single-header {
  max-width: var(--content-width);
  margin: 0 auto var(--space-2xl);
}

.detail-single-header .lead {
  margin-top: var(--space-lg);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--fg-secondary);
  line-height: 1.7;
}

.detail-content {
  max-width: var(--content-width);
  margin: 0 auto;
}

.detail-content p {
  margin-bottom: var(--space-lg);
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.detail-content h2 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.detail-content h3 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.detail-content ul,
.detail-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.detail-content li {
  margin-bottom: var(--space-sm);
}

.detail-content strong {
  color: var(--fg);
  font-weight: 600;
}

.detail-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 0.12em 0.35em;
  color: var(--fg);
}

.detail-content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  font-size: 0.88rem;
  line-height: 1.6;
}

.detail-content pre code {
  background: none;
  border: none;
  padding: 0;
}

.detail-content blockquote {
  border-left: 2px solid var(--fg);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

.detail-content blockquote p {
  color: var(--fg);
  font-style: italic;
  margin-bottom: 0;
}

/* --- Thesis block (home page) --- */
.thesis {
  padding: var(--space-2xl) 0 var(--space-3xl);
  border-bottom: 1px solid var(--border);
}

.thesis blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.02em;
  color: var(--fg);
  max-width: none;
  margin: 0 0 var(--space-lg);
  border: none;
  padding: 0;
}

.thesis p {
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.7;
}

/* --- Founder block --- */
.founder {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-tertiary);
  margin-top: var(--space-lg);
}

.founder a {
  color: var(--fg-secondary);
}

/* --- Apply page --- */
.apply-content {
  max-width: var(--content-width);
}

.apply-content p {
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}

.apply-content strong {
  color: var(--fg);
}

.apply-content ul {
  color: var(--fg-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.apply-content li {
  margin-bottom: var(--space-sm);
}

/* --- Newsletter --- */
.newsletter-block {
  border: 1px solid var(--border);
  padding: var(--space-xl);
  max-width: var(--content-width);
}

.newsletter-block h3 {
  margin-bottom: var(--space-sm);
}

.newsletter-block > p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.newsletter-form {
  display: flex;
  gap: var(--space-sm);
}

.newsletter-form input[type="email"] {
  flex: 1;
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.newsletter-form input[type="email"]:focus {
  border-color: var(--fg);
}

.newsletter-form input[type="email"]::placeholder {
  color: var(--fg-tertiary);
}

.newsletter-note {
  font-size: 0.78rem;
  color: var(--fg-tertiary);
  margin-top: var(--space-sm);
}

.post-content .newsletter-block {
  margin: var(--space-2xl) 0;
}

.footer-newsletter {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-xl);
}

.footer-newsletter .newsletter-block {
  border: none;
  padding: 0;
  max-width: none;
}

.footer-newsletter .newsletter-form {
  max-width: 420px;
}

@media (max-width: 480px) {
  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form .btn {
    width: 100%;
    justify-content: center;
  }
}

/* --- Newsletter Bar (full-width) --- */
.newsletter-bar {
  background: #fcf9ea;
  color: var(--fg);
  padding: var(--space-3xl) 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.newsletter-bar h2 {
  color: var(--fg);
  margin-bottom: var(--space-sm);
}

.newsletter-bar p {
  color: var(--fg-secondary);
  font-size: 1.05rem;
  margin: 0 auto var(--space-xl);
  max-width: none;
}

.newsletter-bar-form {
  display: flex;
  gap: var(--space-sm);
  max-width: 480px;
  margin: 0 auto;
}

.newsletter-bar-form input[type="email"] {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1.1rem;
  padding: 1rem;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.newsletter-bar-form input[type="email"]::placeholder {
  color: var(--fg-tertiary);
}

.newsletter-bar-form input[type="email"]:focus {
  border-color: var(--fg);
}

@media (prefers-color-scheme: dark) {
  .newsletter-bar {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
}

/* --- Join Page: How It Works Grid --- */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.how-card {
  border: 1px solid var(--border);
  padding: var(--space-xl);
}

.how-card h3 {
  margin-bottom: var(--space-sm);
}

.how-card p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 0;
  max-width: none;
}

/* --- Join Page: Criteria Grid --- */
.criteria-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
}

.criteria-grid h3 {
  margin-bottom: var(--space-md);
}

.criteria-grid ul {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  padding-left: var(--space-lg);
}

.criteria-grid li {
  margin-bottom: var(--space-sm);
}

@media (max-width: 768px) {
  .how-grid {
    grid-template-columns: 1fr;
  }

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

/* --- Mobile spacing overrides (must be last to win cascade) --- */
@media (max-width: 768px) {
  .section {
    padding: var(--space-xl) 0;
  }

  .thesis {
    padding: var(--space-lg) 0 var(--space-xl);
  }

  .section-header {
    margin-bottom: var(--space-lg);
  }

  .cta-section {
    padding: var(--space-xl) 0;
  }

  .newsletter-bar {
    padding: var(--space-xl) 0;
  }

  .page-header {
    padding: calc(var(--nav-height) + var(--space-xl)) 0 0;
    border-bottom: none;
  }

  .page-header h1 {
    margin-bottom: var(--space-sm);
  }

  .post-single {
    padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-xl);
  }

  .post-single-header {
    margin-bottom: var(--space-xl);
  }

  .post-single-header h1 {
    font-size: clamp(1.5rem, 7vw, 2.2rem);
  }

  .post-header-rule {
    margin-bottom: var(--space-xl);
  }

  .post-content h2 {
    margin-top: var(--space-xl);
  }

  .post-content h3 {
    margin-top: var(--space-lg);
  }

  .post-nav {
    margin-top: var(--space-xl);
  }

  .detail-single {
    padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-xl);
  }

  .detail-single-header {
    margin-bottom: var(--space-xl);
  }

  .detail-content h2 {
    margin-top: var(--space-xl);
  }

  .site-footer {
    padding-top: var(--space-xl);
  }
}