:root {
  --primary: #0d3b66;
  --accent: #7f9db1;
  --complement: #b4d6e3;
  --ink: #152333;
  --muted: #5d6b78;
  --line: #dbe5ec;
  --surface: #ffffff;
  --surface-muted: #f5f9fb;
  --surface-strong: #eaf4f8;
  --shadow: 0 18px 50px rgba(13, 59, 102, 0.11);
  --radius: 8px;
  --max-width: 1160px;
  --transition: 180ms ease;
}

[data-theme="dark"] {
  --ink: #edf6fb;
  --muted: #bacad5;
  --line: #24455f;
  --surface: #071826;
  --surface-muted: #0d2234;
  --surface-strong: #14324a;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: "Inter", "Open Sans", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

body.nav-open {
  overflow: hidden;
}

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

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

button,
input,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--complement);
  outline-offset: 3px;
}

.skip-link {
  background: var(--primary);
  color: #ffffff;
  left: 1rem;
  padding: 0.75rem 1rem;
  position: fixed;
  top: 0.75rem;
  transform: translateY(-150%);
  transition: transform var(--transition);
  z-index: 200;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
}

[data-theme="dark"] .site-header {
  background: rgba(7, 24, 38, 0.94);
}

.nav-shell {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max-width);
  min-height: 72px;
  padding: 0 1.25rem;
}

.brand {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0;
}

[data-theme="dark"] .brand {
  color: var(--complement);
}

.nav-links {
  align-items: center;
  display: flex;
  gap: 0.35rem;
}

.nav-links a,
.theme-toggle {
  border-radius: var(--radius);
  color: var(--muted);
  padding: 0.6rem 0.8rem;
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a[aria-current="page"],
.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--surface-strong);
  color: var(--primary);
}

[data-theme="dark"] .nav-links a:hover,
[data-theme="dark"] .nav-links a:focus-visible,
[data-theme="dark"] .nav-links a[aria-current="page"],
[data-theme="dark"] .theme-toggle:hover,
[data-theme="dark"] .theme-toggle:focus-visible {
  color: #ffffff;
}

.theme-toggle,
.nav-toggle {
  background: transparent;
  border: 0;
  cursor: pointer;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.75rem;
}

.nav-toggle span {
  background: var(--primary);
  border-radius: 999px;
  display: block;
  height: 2px;
  width: 24px;
}

[data-theme="dark"] .nav-toggle span {
  background: var(--complement);
}

.section {
  padding: 5.5rem 1.25rem;
}

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

.section-inner {
  margin: 0 auto;
  max-width: var(--max-width);
}

.hero {
  padding-top: 6.5rem;
}

.hero-grid {
  align-items: center;
  display: grid;
  gap: 4rem;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.8fr);
}

.eyebrow {
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 0 0.75rem;
  text-transform: uppercase;
}

[data-theme="dark"] .eyebrow {
  color: var(--complement);
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.15;
  margin: 0;
}

h1 {
  font-size: clamp(2.75rem, 7vw, 5.6rem);
  letter-spacing: 0;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

h3 {
  font-size: 1.08rem;
}

.hero-subtitle {
  color: var(--primary);
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 600;
  line-height: 1.45;
  margin: 1.35rem 0 1rem;
  max-width: 760px;
}

[data-theme="dark"] .hero-subtitle {
  color: var(--complement);
}

.summary,
.section-heading + p,
.library-intro p,
.contact-grid p,
.selected-summary p,
.service-card p {
  color: var(--muted);
}

.summary {
  max-width: 720px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.button {
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  min-height: 46px;
  padding: 0.75rem 1rem;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition), transform var(--transition);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--primary);
  color: #ffffff;
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #092f52;
}

.button-secondary {
  background: transparent;
  border-color: var(--accent);
  color: var(--primary);
}

[data-theme="dark"] .button-secondary {
  color: var(--complement);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  background: var(--surface-strong);
}

.hero-media {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 0;
  overflow: hidden;
  position: relative;
}

.hero-media img {
  aspect-ratio: 4 / 5;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.hero-media figcaption {
  background: rgba(13, 59, 102, 0.92);
  bottom: 0;
  color: #ffffff;
  font-size: 0.9rem;
  left: 0;
  padding: 1rem;
  position: absolute;
  width: 100%;
}

.section-heading {
  margin-bottom: 2.25rem;
  max-width: 720px;
}

.cv-grid,
.service-grid {
  display: grid;
  gap: 1rem;
}

.cv-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.service-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cv-block,
.service-card,
.contact-form,
.library-sidebar,
.chat-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px rgba(13, 59, 102, 0.06);
}

[data-theme="dark"] .cv-block,
[data-theme="dark"] .service-card,
[data-theme="dark"] .contact-form,
[data-theme="dark"] .library-sidebar,
[data-theme="dark"] .chat-panel {
  box-shadow: none;
}

.cv-block,
.service-card {
  padding: 1.4rem;
}

.detail-list,
.tag-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.detail-list {
  display: grid;
  gap: 1rem;
}

.detail-list span {
  display: block;
  font-weight: 600;
}

.detail-list small {
  color: var(--muted);
  display: block;
  margin-top: 0.2rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.tag-list li {
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--primary);
  font-size: 0.9rem;
  padding: 0.35rem 0.7rem;
}

[data-theme="dark"] .tag-list li {
  color: var(--complement);
}

.service-card {
  transition: border-color var(--transition), transform var(--transition);
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.contact-grid {
  align-items: start;
  display: grid;
  gap: 3rem;
  grid-template-columns: minmax(0, 0.7fr) minmax(300px, 1fr);
}

.contact-form {
  display: grid;
  gap: 0.7rem;
  padding: 1.5rem;
}

label {
  color: var(--ink);
  font-weight: 700;
}

input,
textarea {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  padding: 0.85rem 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(180, 214, 227, 0.35);
  outline: 0;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.form-status {
  color: var(--primary);
  font-weight: 700;
  min-height: 1.5rem;
}

[data-theme="dark"] .form-status {
  color: var(--complement);
}

.library-intro {
  padding-bottom: 2.25rem;
}

.library-intro .section-inner {
  max-width: 920px;
}

.library-section {
  padding-top: 0;
}

.library-layout {
  align-items: start;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(220px, 25%) minmax(0, 75%);
}

.library-sidebar,
.chat-panel {
  padding: 1.25rem;
}

.library-sidebar {
  display: grid;
  gap: 1.5rem;
  position: sticky;
  top: 96px;
}

.library-group h2 {
  font-size: 1rem;
  margin-bottom: 0.7rem;
}

.item-list {
  display: grid;
  gap: 0.55rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.library-item {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  cursor: pointer;
  padding: 0.75rem;
  text-align: left;
  transition: background var(--transition), border-color var(--transition),
    color var(--transition), transform var(--transition);
  width: 100%;
}

.library-item:hover,
.library-item:focus-visible {
  border-color: var(--accent);
  transform: translateX(2px);
}

.library-item.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.chat-panel {
  display: grid;
  gap: 1rem;
  min-height: 680px;
}

.selected-summary {
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 0.5rem;
  padding-bottom: 1rem;
}

.selected-summary h2 {
  font-size: clamp(1.45rem, 2.2vw, 2rem);
}

.chat-window {
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  max-height: 420px;
  min-height: 360px;
  overflow-y: auto;
  padding: 1rem;
  scroll-behavior: smooth;
}

.message {
  animation: message-in 220ms ease both;
  border-radius: var(--radius);
  max-width: min(78%, 680px);
  padding: 0.8rem 0.95rem;
}

.message small {
  display: block;
  font-weight: 800;
  margin-bottom: 0.2rem;
}

.message p {
  margin: 0;
}

.message-user {
  align-self: flex-end;
  background: var(--primary);
  color: #ffffff;
}

.message-ai {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
}

.typing {
  align-items: center;
  display: inline-flex;
  gap: 0.25rem;
}

.typing span {
  animation: typing-dot 900ms ease-in-out infinite;
  background: var(--accent);
  border-radius: 50%;
  height: 0.45rem;
  width: 0.45rem;
}

.typing span:nth-child(2) {
  animation-delay: 120ms;
}

.typing span:nth-child(3) {
  animation-delay: 240ms;
}

.chat-form {
  display: grid;
  gap: 0.65rem;
}

.chat-input-row {
  align-items: stretch;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr) auto;
}

.chat-input-row textarea {
  min-height: 56px;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 1.5rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@keyframes message-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes typing-dot {
  0%,
  80%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  40% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    display: none;
    left: 0;
    padding: 0.75rem 1.25rem 1.25rem;
    position: absolute;
    right: 0;
    top: 72px;
  }

  .nav-links.is-open {
    display: grid;
    gap: 0.35rem;
  }

  .nav-links a,
  .theme-toggle {
    justify-content: flex-start;
    width: 100%;
  }

  .section {
    padding: 4rem 1rem;
  }

  .hero-grid,
  .contact-grid,
  .library-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 2.5rem;
  }

  .hero-media img {
    aspect-ratio: 16 / 10;
  }

  .cv-grid,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .library-sidebar {
    position: static;
  }

  .chat-panel {
    min-height: auto;
  }
}

@media (max-width: 560px) {
  .button-row,
  .chat-input-row {
    grid-template-columns: 1fr;
  }

  .button-row {
    display: grid;
  }

  .button,
  .chat-input-row .button {
    width: 100%;
  }

  .message {
    max-width: 94%;
  }

  .hero-media figcaption {
    position: static;
  }
}