:root {
  --bg: #f5f7f6;
  --surface: rgba(255, 255, 255, 0.8);
  --surface-strong: #ffffff;
  --border: rgba(39, 67, 63, 0.12);
  --text: #223432;
  --text-soft: rgba(34, 52, 50, 0.72);
  --accent: #3f7d78;
  --accent-strong: #28524e;
  --shadow: 0 18px 40px rgba(17, 34, 31, 0.08);
  --radius-lg: 28px;
  --radius-md: 18px;
  --container: 1120px;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

html[data-theme="dark"] {
  --bg: #121919;
  --surface: rgba(22, 31, 30, 0.88);
  --surface-strong: #1a2322;
  --border: rgba(180, 207, 204, 0.12);
  --text: #edf6f5;
  --text-soft: rgba(237, 246, 245, 0.7);
  --accent: #9dc1bf;
  --accent-strong: #c9dfdd;
  --shadow: 0 20px 46px rgba(0, 0, 0, 0.28);
}

html[data-theme="sand"] {
  --bg: linear-gradient(180deg, #f4ece2 0%, #ecdfce 46%, #e5d6c1 100%);
  --surface: rgba(251, 245, 237, 0.82);
  --surface-strong: #fbf5ed;
  --border: rgba(125, 82, 51, 0.16);
  --text: #4e4031;
  --text-soft: rgba(78, 64, 49, 0.72);
  --accent: #7b5233;
  --accent-strong: #5f3e25;
  --shadow: 0 18px 38px rgba(109, 84, 56, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

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

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 72px 0;
}

.section--compact {
  padding: 16px 0 24px;
}

.site-shell {
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
}

.site-brand {
  display: grid;
  gap: 2px;
}

.site-brand__name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.site-brand__role {
  color: var(--text-soft);
  font-size: 0.9rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.site-nav__link {
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  color: var(--text-soft);
  font-weight: 700;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--text);
  background: var(--surface);
}

.theme-picker {
  display: inline-flex;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.theme-picker__button {
  border: 0;
  background: transparent;
  color: var(--text-soft);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.theme-picker__button.is-active {
  background: var(--accent);
  color: #fff;
}

.hero__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.hero__title {
  margin: 0 0 0.75rem;
  font-size: clamp(2.4rem, 5vw, 4.6rem);
  line-height: 0.95;
}

.hero__text {
  max-width: 58ch;
  color: var(--text-soft);
  font-size: 1.08rem;
}

.hero__media {
  justify-self: center;
}

.hero__image {
  width: min(420px, 78vw);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 32px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading h2,
.page-shell__title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1;
}

.section-heading__text,
.page-shell__intro,
.post-card__summary,
.notes-card__summary {
  color: var(--text-soft);
}

.social-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.social-link__icon {
  display: inline-grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 14px;
  background: var(--text);
  color: var(--surface-strong);
  font-weight: 800;
  text-transform: uppercase;
}

.social-link__label {
  font-weight: 800;
}

.education-grid,
.notes-grid,
.post-feed {
  display: grid;
  gap: 1.5rem;
}

.education-card,
.notes-card,
.post-card,
.page-shell__content {
  border-radius: var(--radius-md);
}

.education-card,
.notes-card,
.post-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.education-card__year,
.post-card__date,
.notes-card__date {
  margin: 0 0 0.55rem;
  color: var(--text-soft);
  font-weight: 700;
}

.education-card__title,
.notes-card__title,
.post-card__title {
  margin: 0 0 0.45rem;
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  line-height: 1.1;
}

.education-card__degree {
  margin: 0;
  color: var(--text-soft);
}

.button,
.section-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

.page-shell {
  padding: 72px 0;
}

.page-shell__container {
  max-width: 860px;
}

.page-shell__header {
  margin-bottom: 2rem;
}

.page-shell__content {
  padding: 2rem;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.prose > :first-child {
  margin-top: 0;
}

.prose > :last-child {
  margin-bottom: 0;
}

.prose h2,
.prose h3 {
  line-height: 1.15;
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
}

.post-meta,
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.post-meta {
  margin-top: 0.75rem;
  flex-direction: column;
  align-items: flex-start;
}

.post-card {
  transition: border-color 0.18s;
}

.post-card:hover {
  border-color: var(--accent);
}

.post-card__title a:hover {
  color: var(--accent);
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-strong) 80%, transparent);
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: border-color 0.18s, background 0.18s;
}

.tag-pill:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.tag-pill--large {
  font-size: 0.86rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-block {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 700;
  transition: border-color 0.18s, background 0.18s;
}

.tag-block:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  color: var(--accent-strong);
}

.tag-block__count {
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
}

.site-footer {
  padding: 28px 0 48px;
  border-top: 1px solid var(--border);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

.site-footer__title {
  margin: 0 0 0.2rem;
  font-weight: 800;
}

.site-footer__text {
  margin: 0;
  color: var(--text-soft);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--text-soft);
  font-weight: 700;
}

.exp-chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.exp-chip {
  display: grid;
  gap: 3px;
  padding: 1rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: border-color 0.18s, box-shadow 0.18s;
  min-width: 160px;
}

.exp-chip:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.exp-chip__company {
  font-weight: 800;
  font-size: 1rem;
}

.exp-chip__role {
  color: var(--text-soft);
  font-size: 0.88rem;
}

.exp-chip__duration {
  margin-top: 4px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exp-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 1.5rem;
  color: var(--text-soft);
  font-weight: 700;
  font-size: 0.9rem;
}

.exp-back:hover {
  color: var(--accent);
}

@media (min-width: 760px) {
  .hero__grid,
  .education-grid,
  .notes-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  }
}

@media (max-width: 820px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* RAG chat widget */
.rag-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.rag-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.75rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.18s;
}

.rag-toggle:hover {
  background: var(--accent-strong);
}

.rag-panel {
  display: none;
  flex-direction: column;
  width: min(380px, calc(100vw - 48px));
  height: 480px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.rag-panel--open {
  display: flex;
}

.rag-panel__header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.rag-panel__title {
  display: block;
  font-weight: 800;
  font-size: 0.95rem;
}

.rag-panel__sub {
  display: block;
  color: var(--text-soft);
  font-size: 0.78rem;
}

.rag-messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rag-bubble {
  max-width: 86%;
  padding: 0.65rem 0.9rem;
  border-radius: 16px;
  font-size: 0.88rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.rag-bubble--user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.rag-bubble--assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.rag-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--text-soft);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.rag-form {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
}

.rag-input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  outline: none;
}

.rag-input:focus {
  border-color: var(--accent);
}

.rag-send {
  display: inline-grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.18s;
}

.rag-send:hover {
  background: var(--accent-strong);
}