:root {
  --bg: hsl(220, 12%, 7%);
  --surface: hsl(220, 10%, 11%);
  --surface-2: hsl(220, 9%, 15%);
  --border: hsl(220, 7%, 23%);
  --text: hsl(0, 0%, 97%);
  --muted: hsl(220, 7%, 72%);
  --muted-2: hsl(220, 7%, 58%);
  --accent: hsl(43, 96%, 67%);
  --accent-dark: hsl(42, 70%, 46%);
  --danger: hsl(0, 65%, 65%);
  --project-background: hsl(220, 9%, 15%);
  --project-glow: hsla(43, 96%, 67%, 0.13);
  --project-grid: hsla(0, 0%, 100%, 0.035);
  --project-shadow: hsla(0, 0%, 0%, 0.4);
  --gradient: linear-gradient(135deg, hsl(45, 100%, 72%), hsl(35, 100%, 63%));
  --card-gradient: linear-gradient(145deg, hsla(0, 0%, 100%, 0.06), transparent 55%);
  --shadow: 0 18px 45px hsla(0, 0%, 0%, 0.28);
  --radius: 20px;
  --transition: 180ms ease;
}

[data-theme="light"] {
  --project-background: hsl(220, 22%, 94%);
  --project-glow: hsla(43, 88%, 50%, 0.18);
  --project-grid: hsla(220, 20%, 20%, 0.045);
  --project-shadow: hsla(220, 20%, 20%, 0.2);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-family: "Poppins", sans-serif; scroll-behavior: smooth; }
body { min-width: 280px; background: var(--bg); color: var(--text); }
a { color: inherit; text-decoration: none; }
li { list-style: none; }
img, ion-icon { display: block; }
button, input, textarea, select { font: inherit; }
button { border: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { color: var(--bg); background: var(--accent); }

.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 16px; color: var(--bg); background: var(--accent); border-radius: 8px; transform: translateY(-150%); transition: transform var(--transition); }
.skip-link:focus { transform: translateY(0); }

main { margin: 15px 12px 90px; }
.sidebar, article { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.sidebar { max-height: 112px; margin-bottom: 15px; padding: 15px; overflow: hidden; transition: max-height 450ms ease; }
.sidebar.active { max-height: 520px; }
.sidebar-info { position: relative; display: flex; align-items: center; gap: 15px; }
.avatar-box { flex: 0 0 auto; overflow: hidden; background: var(--surface-2); border-radius: 18px; }
.avatar-box img { width: 80px; height: 80px; object-fit: cover; }
.info-content { min-width: 0; }
.name { margin-bottom: 8px; font-size: 17px; font-weight: 500; letter-spacing: -0.3px; }
.title { width: max-content; max-width: 100%; padding: 4px 11px; overflow: hidden; color: var(--text); background: var(--surface-2); border-radius: 7px; font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.info_more-btn { position: absolute; top: -15px; right: -15px; z-index: 2; padding: 11px; color: var(--accent); background: var(--card-gradient), var(--surface-2); border: 1px solid var(--border); border-radius: 0 15px; }
.info_more-btn span { display: none; }
.sidebar-info_more { visibility: hidden; opacity: 0; transition: opacity 250ms ease 100ms; }
.sidebar.active .sidebar-info_more { visibility: visible; opacity: 1; }
.separator { width: 100%; height: 1px; margin: 22px 0; background: var(--border); }
.contacts-list { display: grid; gap: 16px; }
.contact-item { display: flex; align-items: center; gap: 14px; min-width: 0; }
.icon-box { position: relative; z-index: 1; display: grid; flex: 0 0 auto; width: 38px; height: 38px; place-items: center; color: var(--accent); background: var(--card-gradient), var(--surface-2); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 18px hsla(0, 0%, 0%, 0.2); }
.contact-info { min-width: 0; }
.contact-title { margin-bottom: 2px; color: var(--muted-2); font-size: 10px; text-transform: uppercase; }
.contact-link, address { display: block; overflow: hidden; color: var(--text); font-size: 12px; font-style: normal; text-overflow: ellipsis; white-space: nowrap; }
.social-list { display: flex; gap: 15px; padding-left: 5px; }
.social-link { color: var(--muted); font-size: 21px; transition: color var(--transition), transform var(--transition); }
.social-link:hover { color: var(--accent); transform: translateY(-2px); }
.download-btn { display: flex; align-items: center; gap: 8px; margin-top: 18px; padding: 10px 13px; color: var(--muted-2); background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; font-size: 12px; cursor: not-allowed; }

.main-content { position: relative; }
.navbar { position: fixed; bottom: 0; left: 0; z-index: 10; width: 100%; background: hsla(220, 10%, 13%, 0.9); border: 1px solid var(--border); border-radius: 14px 14px 0 0; backdrop-filter: blur(12px); }
.navbar-list { display: flex; justify-content: center; overflow-x: auto; }
.navbar-link { display: block; padding: 19px 7px; color: var(--muted); font-size: 10px; white-space: nowrap; transition: color var(--transition); }
.navbar-link:hover, .navbar-link.active { color: var(--accent); }

article { display: none; padding: 15px; }
article.active { display: block; animation: fade 350ms ease both; }
@keyframes fade { from { opacity: 0; transform: translateY(5px); } }
.h2, .h3, .h4 { color: var(--text); }
.h2 { font-size: 24px; }
.h3 { font-size: 18px; }
.h4 { font-size: 15px; }
.article-title { position: relative; margin-bottom: 30px; padding-bottom: 10px; }
.article-title::after { position: absolute; bottom: 0; left: 0; width: 34px; height: 4px; background: var(--gradient); border-radius: 5px; content: ""; }
.about-text { margin-bottom: 35px; color: var(--muted); font-size: 14px; font-weight: 300; line-height: 1.75; }
.about-text p + p { margin-top: 15px; }
.service { margin-bottom: 35px; }
.service-title, .section-heading { margin-bottom: 20px; }
.service-list { display: grid; gap: 18px; }
.service-item, .credential-card, .skill-group, .highlight-card { position: relative; background: var(--card-gradient), var(--surface-2); border: 1px solid var(--border); border-radius: 15px; box-shadow: 0 12px 28px hsla(0, 0%, 0%, 0.17); }
.service-item { padding: 20px; text-align: center; }
.service-icon-box img { margin: 0 auto 12px; }
.service-item-title { margin-bottom: 8px; }
.service-item-text { color: var(--muted); font-size: 13px; font-weight: 300; line-height: 1.65; }
.highlights .h3 { margin-bottom: 20px; }
.highlight-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.highlight-card { min-height: 115px; padding: 18px 14px; }
.highlight-card strong { display: block; margin-bottom: 5px; color: var(--accent); font-size: 28px; }
.highlight-card span { color: var(--muted); font-size: 12px; line-height: 1.45; }

.timeline { margin-bottom: 38px; }
.timeline:last-child { margin-bottom: 0; }
.title-wrapper { display: flex; align-items: center; gap: 13px; margin-bottom: 25px; }
.timeline-list { margin-left: 30px; font-size: 13px; }
.timeline-item { position: relative; }
.timeline-item:not(:last-child) { margin-bottom: 28px; }
.timeline-item:not(:last-child)::before { position: absolute; top: 7px; left: -20px; width: 1px; height: calc(100% + 28px); background: var(--border); content: ""; }
.timeline-item::after { position: absolute; top: 6px; left: -23px; width: 7px; height: 7px; background: var(--gradient); border-radius: 50%; box-shadow: 0 0 0 4px var(--border); content: ""; }
.timeline-item-title { margin-bottom: 7px; line-height: 1.45; }
.timeline-list span { color: var(--accent-dark); line-height: 1.6; }
.timeline-label { margin-top: 7px; color: var(--text); }
.timeline-label a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.timeline-text, .detail-list { margin-top: 9px; color: var(--muted); font-weight: 300; line-height: 1.7; }
.detail-list li { position: relative; margin: 7px 0; padding-left: 16px; }
.detail-list li::before { position: absolute; top: 9px; left: 0; width: 5px; height: 5px; background: var(--accent); border-radius: 50%; content: ""; }

.filter-list { display: none; }
.filter-select-label { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; }
.filter-select { width: 100%; margin-bottom: 25px; padding: 12px 14px; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.project-list { display: grid; gap: 25px; }
.project-item { display: none; }
.project-item.active { display: block; animation: scale-up 220ms ease both; }
@keyframes scale-up { from { opacity: 0; transform: scale(0.96); } }
.project-card { display: block; width: 100%; color: inherit; background: none; text-align: left; }
.project-img { position: relative; height: 190px; margin-bottom: 13px; overflow: hidden; background: var(--surface-2); border-radius: 15px; }
.project-img::after { position: absolute; inset: 0; background: hsla(0, 0%, 0%, 0); content: ""; transition: background var(--transition); }
.project-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.project-img[data-image-mode="transparent"] {
  background:
    radial-gradient(circle at 22% 18%, var(--project-glow), transparent 42%),
    linear-gradient(var(--project-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--project-grid) 1px, transparent 1px),
    var(--project-background);
  background-size: auto, 24px 24px, 24px 24px, auto;
}
.project-img[data-image-mode="transparent"] img {
  padding: 14px;
  object-fit: contain;
  filter: drop-shadow(0 14px 18px var(--project-shadow));
}
.project-img[data-image-mode="full"] img { padding: 0; object-fit: cover; }
.project-item-icon-box { position: absolute; top: 50%; left: 50%; z-index: 2; display: grid; width: 52px; height: 52px; place-items: center; color: var(--accent); background: var(--surface-2); border-radius: 12px; opacity: 0; transform: translate(-50%, -50%) scale(0.8); transition: opacity var(--transition), transform var(--transition); }
.project-card:hover .project-img::after, .project-card:focus-visible .project-img::after { background: hsla(0, 0%, 0%, 0.48); }
.project-card:hover img, .project-card:focus-visible img { transform: scale(1.05); }
.project-card:hover .project-item-icon-box, .project-card:focus-visible .project-item-icon-box { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.project-title { margin: 0 8px 4px; font-size: 15px; font-weight: 500; }
.project-category { margin-left: 8px; color: var(--muted-2); font-size: 13px; }

.credential-section { margin-bottom: 35px; }
.credential-grid, .skill-groups { display: grid; gap: 16px; }
.credential-card { padding: 20px; }
.credential-kicker { display: block; margin-bottom: 8px; color: var(--accent); font-size: 11px; text-transform: uppercase; }
.credential-card h4 { margin-bottom: 5px; }
.credential-period { margin-bottom: 12px; color: var(--muted-2) !important; font-size: 12px !important; }
.credential-card p { color: var(--muted); font-size: 13px; font-weight: 300; line-height: 1.65; }
.training-list { display: grid; gap: 10px; }
.training-list a, .training-list > li > div { display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; transition: border-color var(--transition), transform var(--transition); }
.training-list a:hover { border-color: var(--accent-dark); transform: translateX(3px); }
.training-list strong { font-size: 13px; font-weight: 500; }
.training-list span { color: var(--muted-2); font-size: 11px; }
.skill-group { padding: 18px; }
.skill-group h4 { margin-bottom: 12px; color: var(--text); font-size: 13px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li { padding: 6px 10px; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: 999px; font-size: 11px; }

.mapbox { height: 280px; margin-bottom: 30px; overflow: hidden; border: 1px solid var(--border); border-radius: 16px; }
.mapbox iframe { width: 100%; height: 100%; border: 0; filter: grayscale(1) invert(0.92) contrast(0.9); }
.contact-intro { margin-bottom: 35px; }
.contact-intro h3 { margin-bottom: 10px; }
.contact-intro p, .form-note { color: var(--muted); font-size: 13px; font-weight: 300; line-height: 1.7; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.contact-actions a { display: flex; align-items: center; gap: 7px; padding: 9px 12px; color: var(--accent); background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; font-size: 12px; }
.form-title { margin-bottom: 8px; }
.form-note { margin-bottom: 20px; }
.input-wrapper { display: grid; gap: 18px; margin-bottom: 18px; }
.form label { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; }
.form-input { width: 100%; padding: 13px 15px; color: var(--text); background: transparent; border: 1px solid var(--border); border-radius: 12px; outline: 0; }
.form-input:focus { border-color: var(--accent); }
.form-input[aria-invalid="true"] { border-color: var(--danger); }
textarea.form-input { min-height: 130px; resize: vertical; }
.form-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; margin-top: 18px; padding: 13px 18px; color: var(--accent); background: var(--card-gradient), var(--surface-2); border: 1px solid var(--border); border-radius: 12px; }
.form-status { min-height: 21px; margin-top: 12px; color: var(--accent); font-size: 12px; }


@media (min-width: 580px) {
  main { margin-top: 60px; margin-bottom: 100px; }
  .sidebar, article { width: 520px; margin-inline: auto; padding: 30px; }
  .sidebar { max-height: 181px; margin-bottom: 30px; }
  .sidebar.active { max-height: 550px; }
  .sidebar-info { gap: 24px; }
  .avatar-box img { width: 120px; height: 120px; }
  .name { font-size: 25px; }
  .title { padding: 5px 15px; font-size: 12px; }
  .info_more-btn { top: -30px; right: -30px; padding: 11px 15px; }
  .info_more-btn span { display: block; font-size: 11px; }
  .info_more-btn ion-icon { display: none; }
  .contacts-list { grid-template-columns: 1fr 1fr; }
  .navbar-list { gap: 12px; }
  .navbar-link { padding: 20px 8px; font-size: 13px; }
  article { min-height: 600px; }
  .h2 { font-size: 30px; }
  .article-title { padding-bottom: 15px; }
  .about-text { font-size: 15px; }
  .service-item { display: flex; align-items: flex-start; gap: 18px; padding: 25px; text-align: left; }
  .service-icon-box img { margin: 3px 0 0; }
  .project-img { height: 230px; }
  .input-wrapper { grid-template-columns: 1fr 1fr; }
  .form-btn { width: max-content; margin-left: auto; }
}

@media (min-width: 768px) {
  .sidebar, article { width: 700px; }
  .filter-select-label, .filter-select { display: none; }
  .filter-list { display: flex; gap: 10px; margin-bottom: 28px; }
  .filter-list button { padding: 8px 12px; color: var(--muted); background: transparent; border-radius: 9px; }
  .filter-list button:hover, .filter-list button.active { color: var(--accent); background: var(--surface-2); }
  .project-list, .credential-grid, .skill-groups { grid-template-columns: 1fr 1fr; }
  .project-img { height: 190px; }
}

@media (min-width: 1024px) {
  .sidebar, article { width: 950px; }
  .main-content { width: max-content; margin: auto; }
  .navbar { position: absolute; top: 0; right: 0; bottom: auto; left: auto; width: max-content; border-radius: 0 20px; }
  .navbar-list { padding: 0 12px; }
  .navbar-link { padding: 20px 11px; font-size: 14px; }
  .service-list { grid-template-columns: 1fr 1fr; }
  .highlight-grid { grid-template-columns: repeat(4, 1fr); }
  .project-list { grid-template-columns: repeat(3, 1fr); }
  .project-img { height: 170px; }
}

@media (min-width: 1250px) {
  main { display: flex; align-items: flex-start; gap: 25px; max-width: 1200px; margin-inline: auto; }
  .sidebar { position: sticky; top: 60px; width: 275px; max-height: none; margin: 0; padding-top: 50px; overflow: visible; }
  .sidebar-info { flex-direction: column; }
  .avatar-box img { width: 150px; height: 150px; }
  .name { text-align: center; white-space: nowrap; }
  .title { margin: auto; }
  .info_more-btn { display: none; }
  .sidebar-info_more { visibility: visible; opacity: 1; }
  .contacts-list { grid-template-columns: 1fr; }
  .main-content, article { width: 900px; }
  article { min-height: 720px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}