@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;600&display=swap');

:root {
  --primary: #0f62fe;
  --primary-hover: #0050e6;
  --primary-pressed: #002d9c;
  --ink: #161616;
  --ink-muted: #525252;
  --ink-subtle: #8c8c8c;
  --canvas: #ffffff;
  --surface-1: #f4f4f4;
  --surface-2: #e0e0e0;
  --hairline: #e0e0e0;
  --inverse-canvas: #161616;
  --inverse-ink: #ffffff;
  --inverse-ink-muted: #c6c6c6;
  --semantic-error: #da1e28;
  --semantic-success: #24a148;
  --font: 'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.16px;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.sf-container {
  max-width: 1312px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.sf-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  height: 64px;
}

.sf-header__inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.sf-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}

.sf-header__logo:hover { text-decoration: none; }

.sf-header__brand {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
}

.sf-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.sf-nav__link {
  display: inline-block;
  padding: 0 16px;
  height: 64px;
  line-height: 64px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.16px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.sf-nav__link:hover {
  color: var(--primary);
  text-decoration: none;
  border-bottom-color: var(--primary);
}

.sf-nav__link--active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.sf-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 44px;
  height: 44px;
  justify-content: center;
  align-items: center;
}

.sf-burger__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}

.sf-footer {
  background: var(--inverse-canvas);
  color: var(--inverse-ink-muted);
  font-size: 14px;
  line-height: 1.71;
  letter-spacing: 0.16px;
  padding-top: 64px;
}

.sf-footer__inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  padding-bottom: 48px;
}

.sf-footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--inverse-ink);
  font-weight: 600;
  text-decoration: none;
  margin-bottom: 12px;
}

.sf-footer__logo:hover { text-decoration: none; color: var(--inverse-ink); }

.sf-footer__tagline {
  font-size: 12px;
  color: var(--inverse-ink-muted);
  max-width: 280px;
  line-height: 1.5;
}

.sf-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.sf-footer__col { display: flex; flex-direction: column; gap: 8px; }

.sf-footer__col-heading {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.32px;
  color: var(--inverse-ink);
  text-transform: none;
  margin-bottom: 4px;
}

.sf-footer__col a {
  color: var(--inverse-ink-muted);
  text-decoration: none;
  font-size: 14px;
}

.sf-footer__col a:hover { color: var(--inverse-ink); text-decoration: underline; }

.sf-footer__bottom {
  border-top: 1px solid #393939;
  padding: 16px 0;
}

.sf-footer__bottom p {
  font-size: 12px;
  color: var(--inverse-ink-muted);
  letter-spacing: 0.32px;
}

.sf-footer__bottom a { color: var(--inverse-ink-muted); text-decoration: underline; }
.sf-footer__bottom a:hover { color: var(--inverse-ink); }

.sf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.16px;
  line-height: 1.29;
  padding: 12px 16px;
  border-radius: 0;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

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

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

.sf-btn--secondary {
  background: var(--ink);
  color: var(--inverse-ink);
}

.sf-btn--secondary:hover {
  background: #393939;
  color: var(--inverse-ink);
  text-decoration: none;
}

.sf-btn--ghost {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.sf-btn--ghost:hover {
  background: var(--surface-1);
  text-decoration: none;
}

.sf-hero {
  background: var(--inverse-canvas);
  color: var(--inverse-ink);
  padding: 80px 0 64px;
}

.sf-hero__eyebrow {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.16px;
  color: #a8c8ff;
  margin-bottom: 16px;
}

.sf-hero__title {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 300;
  line-height: 1.17;
  letter-spacing: -0.4px;
  color: var(--inverse-ink);
  max-width: 760px;
  margin-bottom: 24px;
}

.sf-hero__body {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--inverse-ink-muted);
  max-width: 560px;
  margin-bottom: 32px;
}

.sf-section {
  padding: 80px 0;
}

.sf-section--surface {
  background: var(--surface-1);
}

.sf-section__eyebrow {
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.16px;
  color: var(--ink-muted);
  margin-bottom: 12px;
}

.sf-section__title {
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0;
  color: var(--ink);
  margin-bottom: 24px;
}

.sf-section__lead {
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  max-width: 680px;
  margin-bottom: 48px;
}

.sf-grid {
  display: grid;
  gap: 1px;
  background: var(--hairline);
}

.sf-grid--2 { grid-template-columns: repeat(2, 1fr); }
.sf-grid--3 { grid-template-columns: repeat(3, 1fr); }
.sf-grid--4 { grid-template-columns: repeat(4, 1fr); }

.sf-card {
  background: var(--canvas);
  padding: 24px;
  border: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sf-card--surface { background: var(--surface-1); }

.sf-card__eyebrow {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
}

.sf-card__title {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.33;
  color: var(--ink);
}

.sf-card__body {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-muted);
  flex: 1;
}

.sf-card__link {
  font-size: 14px;
  color: var(--primary);
  font-weight: 400;
}

.sf-card__img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-bottom: 1px solid var(--hairline);
}

.sf-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  margin-top: 32px;
}

.sf-gallery__item {
  position: relative;
  overflow: hidden;
  background: var(--canvas);
}

.sf-gallery__img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
}

.sf-gallery__caption {
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
}

.sf-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.sf-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.sf-breadcrumb a { color: var(--primary); text-decoration: none; }
.sf-breadcrumb a:hover { text-decoration: underline; }
.sf-breadcrumb__sep { color: var(--ink-subtle); }

.sf-article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 16px;
}

.sf-article__meta span { display: inline-flex; align-items: center; gap: 4px; }

.sf-article__summary {
  background: var(--surface-1);
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-muted);
  margin-bottom: 32px;
}

.sf-article__toc {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.sf-article__toc-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 12px;
}

.sf-article__toc ol {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sf-article__toc li { font-size: 14px; }
.sf-article__toc a { color: var(--primary); }

.sf-article__body h2 {
  font-size: 28px;
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
  margin: 40px 0 16px;
}

.sf-article__body h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  margin: 28px 0 12px;
}

.sf-article__body p {
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 20px;
}

.sf-article__body ul, .sf-article__body ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.sf-article__body li {
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.16px;
  margin-bottom: 8px;
}

.sf-article__figure {
  margin: 32px 0;
  border: 1px solid var(--hairline);
}

.sf-article__figure img {
  width: 100%;
}

.sf-article__figcaption {
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.32px;
  color: var(--ink-subtle);
  background: var(--surface-1);
  border-top: 1px solid var(--hairline);
}

.sf-article__box {
  border: 1px solid var(--hairline);
  padding: 24px;
  margin: 32px 0;
  background: var(--surface-1);
}

.sf-article__box-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 12px;
}

.sf-article__box p {
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-muted);
}

.sf-related {
  border-top: 1px solid var(--hairline);
  padding-top: 48px;
  margin-top: 48px;
}

.sf-related__title {
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 24px;
}

.sf-article-page {
  padding: 48px 0 80px;
}

.sf-article-page .sf-container {
  max-width: 800px;
}

.sf-page {
  padding: 64px 0 96px;
}

.sf-page .sf-container { max-width: 800px; }

.sf-page h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 24px;
}

.sf-page h2 {
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  margin: 40px 0 12px;
}

.sf-page h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 24px 0 8px;
}

.sf-page p, .sf-page li {
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.16px;
  color: var(--ink);
  margin-bottom: 16px;
}

.sf-page ul, .sf-page ol { padding-left: 24px; margin-bottom: 16px; }

.sf-page hr {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 40px 0;
}

.sf-contact-form {
  max-width: 600px;
}

.sf-form-group {
  margin-bottom: 20px;
}

.sf-form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.32px;
  color: var(--ink);
  margin-bottom: 6px;
}

.sf-form-input, .sf-form-textarea, .sf-form-select {
  width: 100%;
  background: var(--surface-1);
  border: none;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 0.16px;
  padding: 11px 16px;
  border-radius: 0;
  transition: border-color 0.15s;
  outline: none;
}

.sf-form-input:focus, .sf-form-textarea:focus {
  border-bottom: 2px solid var(--primary);
}

.sf-form-input.error, .sf-form-textarea.error {
  border-bottom: 2px solid var(--semantic-error);
}

.sf-form-textarea { resize: vertical; min-height: 140px; }

.sf-form-error {
  font-size: 12px;
  color: var(--semantic-error);
  margin-top: 4px;
  display: none;
}

.sf-form-error.visible { display: block; }

.sf-form-success {
  background: var(--surface-1);
  border-left: 4px solid var(--semantic-success);
  padding: 16px 20px;
  font-size: 16px;
  color: var(--ink);
  display: none;
  margin-top: 16px;
}

.sf-form-success.visible { display: block; }

.sf-cookie {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--inverse-canvas);
  border-top: 1px solid #393939;
  padding: 20px 24px;
}

.sf-cookie__inner {
  max-width: 1312px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.sf-cookie__text {
  font-size: 14px;
  color: var(--inverse-ink-muted);
  flex: 1;
  min-width: 200px;
}

.sf-cookie__text a { color: #78a9ff; }

.sf-cookie__actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.sf-page-header {
  background: var(--inverse-canvas);
  color: var(--inverse-ink);
  padding: 64px 0 48px;
}

.sf-page-header h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 300;
  line-height: 1.2;
  color: var(--inverse-ink);
  margin-bottom: 16px;
}

.sf-page-header p {
  font-size: 18px;
  color: var(--inverse-ink-muted);
  max-width: 560px;
  margin-bottom: 0;
}

@media (max-width: 1056px) {
  .sf-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .sf-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .sf-gallery { grid-template-columns: repeat(2, 1fr); }
  .sf-two-col { grid-template-columns: 1fr; gap: 32px; }
  .sf-footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .sf-footer__cols { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 672px) {
  .sf-burger { display: flex; }
  .sf-nav {
    display: none;
    position: fixed;
    inset: 0;
    top: 64px;
    background: var(--canvas);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 0;
    gap: 0;
    border-top: 1px solid var(--hairline);
    overflow-y: auto;
    z-index: 99;
  }
  .sf-nav--open { display: flex; }
  .sf-nav__link {
    width: 100%;
    height: auto;
    line-height: 1;
    padding: 16px 24px;
    border-bottom: 1px solid var(--surface-1);
    border-left: none;
    font-size: 16px;
  }
  .sf-grid--2, .sf-grid--3, .sf-grid--4 { grid-template-columns: 1fr; }
  .sf-gallery { grid-template-columns: 1fr; }
  .sf-footer__cols { grid-template-columns: 1fr; gap: 24px; }
  .sf-cookie__inner { flex-direction: column; align-items: flex-start; }
  .sf-hero { padding: 48px 0 40px; }
  .sf-section { padding: 48px 0; }
}