/* ===========================================================
   RUSHANMANS — design system
   Premium minimalism / glassmorphism / deep atmosphere
   =========================================================== */
:root {
  --bg-base: #0a0b12;
  --glass: rgba(255, 255, 255, 0.07);
  --glass-strong: rgba(255, 255, 255, 0.11);
  --glass-border: rgba(255, 255, 255, 0.15);
  --text: #f5f6fb;
  --text-dim: rgba(245, 246, 251, 0.62);
  --text-faint: rgba(245, 246, 251, 0.4);
  --accent: #8b93ff;
  --accent-2: #34d1c2;
  --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 30px 60px rgba(0, 0, 0, 0.5);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max-width: 1120px;
  /* Фон по умолчанию для всех страниц. Переопределяется классом на
     <body> конкретной страницы — см. .bg-none и .bg-* ниже. */
  --bg-image: url("../assets/bg-main.jpg");
}

/* Переопределения фона по классу на <body>: <body class="bg-none">
   совсем без фото, или заведи свой класс по образцу — например
   .bg-about { --bg-image: url("../assets/bg-about.jpg"); } */
body.bg-none { --bg-image: none; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0 20px;
  min-height: 100vh;
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  font-weight: 400;
  line-height: 1.65;
  position: relative;
  isolation: isolate;
}

/* Deep, layered background: color blooms + (once added) a real photo behind it */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 12% 18%, rgba(139, 147, 255, 0.30), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(52, 209, 194, 0.20), transparent 40%),
    radial-gradient(circle at 50% 95%, rgba(139, 90, 255, 0.22), transparent 45%),
    var(--bg-base) var(--bg-image) center / cover no-repeat fixed;
  background-blend-mode: screen, screen, screen, normal;
}
/* Darkening veil so text + glass stay legible over any photo */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(5, 6, 11, 0.45), rgba(5, 6, 11, 0.82) 70%);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

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

/* ===========================================================
   Glass primitive — the core visual signature
   =========================================================== */
.glass {
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
  border-radius: 22px;
}

/* ===========================================================
   Header — floating glass capsule nav
   =========================================================== */
header.site-header {
  position: sticky;
  top: 16px;
  z-index: 50;
  padding: 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
}

.logo {
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text);
  white-space: nowrap;
}
.logo span { color: var(--accent); }
.logo:hover { text-decoration: none; }

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  padding: 8px 16px;
  border-radius: 999px;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--glass-strong);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    left: 0; right: 0; top: calc(100% + 10px);
    flex-direction: column;
    background: rgba(15, 16, 24, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 22px;
    padding: 14px;
    gap: 4px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; }
}

/* ===========================================================
   Sections / typography rhythm
   =========================================================== */
section { padding: 56px 0; }

.hero { padding: 64px 0 40px; }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 18px;
}
.hero p.lead {
  color: var(--text-dim);
  font-weight: 300;
  letter-spacing: 0.01em;
  font-size: 1.15rem;
  max-width: 620px;
}
.hero .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0b12;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
  box-shadow: 0 10px 30px rgba(139, 147, 255, 0.25);
}
.btn:hover { transform: translateY(-3px); text-decoration: none; box-shadow: 0 16px 36px rgba(139, 147, 255, 0.35); }

.btn.secondary {
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}
.btn.secondary:hover { box-shadow: var(--shadow-soft); }

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 26px;
  flex-wrap: wrap;
  gap: 8px;
}
.section-title h2 {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-title a { font-size: 0.9rem; font-weight: 500; color: var(--text-dim); }
.section-title a:hover { color: var(--accent); }

/* ===========================================================
   Blog controls — search + tag filter
   =========================================================== */
.blog-controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.search-input {
  width: 100%;
  max-width: 420px;
  padding: 13px 22px;
  border-radius: 999px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.search-input::placeholder { color: var(--text-faint); }
.search-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--glass-strong);
}

.tag-filter { display: flex; flex-wrap: wrap; gap: 8px; }

.tag-chip {
  cursor: pointer;
  font-family: inherit;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.tag-chip:hover { color: var(--text); }
.tag-chip.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0b12;
  border-color: transparent;
  font-weight: 600;
}

.card[hidden] { display: none; }

/* ===========================================================
   Cards
   =========================================================== */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.card {
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 22px;
  padding: 26px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 11px;
  position: relative;
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease), background 0.45s var(--ease);
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  background: var(--glass-strong);
  z-index: 5;
}

.card .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card h3 { margin: 0; font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--text-dim); font-weight: 300; font-size: 0.95rem; overflow-wrap: break-word; }
.card .meta { font-size: 0.78rem; color: var(--text-faint); margin-top: auto; letter-spacing: 0.02em; }

.card .stack { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.chip {
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-dim);
  padding: 5px 14px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

/* ===========================================================
   Homepage "card deck" — signature stacked layout
   =========================================================== */
.card-stack {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  max-width: 640px;
  margin: 0 auto;
}
.card-stack .card {
  margin-top: -44px;
}
.card-stack .card:first-child { margin-top: 0; }
.card-stack .card:nth-child(1) { transform: rotate(-2.5deg) translateX(-14px); }
.card-stack .card:nth-child(2) { transform: rotate(1.8deg) translateX(16px); z-index: 2; }
.card-stack .card:nth-child(3) { transform: rotate(-1deg) translateX(-6px); z-index: 3; }
.card-stack .card:hover {
  transform: translateY(-14px) rotate(0deg) scale(1.015);
  z-index: 10;
}
@media (max-width: 640px) {
  .card-stack .card { margin-top: 16px; transform: none !important; }
  .card-stack .card:first-child { margin-top: 0; }
  .card-stack .card:hover { transform: translateY(-6px) !important; }
}

/* ===========================================================
   Article
   =========================================================== */
.article-header {
  padding: 52px 0 28px;
  margin-bottom: 30px;
}
.article-header .tag { color: var(--accent-2); font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; }
.article-header h1 { margin: 12px 0 8px; font-weight: 900; letter-spacing: -0.02em; font-size: clamp(1.8rem, 4vw, 2.6rem); }
.article-header .meta { color: var(--text-dim); font-size: 0.9rem; font-weight: 300; }

article.content {
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 40px clamp(20px, 5vw, 56px) 56px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 60px;
}
article.content h2 { margin-top: 2.2em; font-size: 1.4rem; font-weight: 800; letter-spacing: -0.01em; }
article.content h3 { margin-top: 1.6em; font-size: 1.15rem; font-weight: 700; }
article.content p { margin: 1em 0; color: var(--text-dim); font-weight: 300; }
article.content strong { color: var(--text); font-weight: 600; }
article.content ul, article.content ol { margin: 1em 0; padding-left: 1.4em; color: var(--text-dim); font-weight: 300; }
article.content li { margin: 0.35em 0; }

pre {
  background: rgba(0, 0, 0, 0.45);
  color: #e6e8f0;
  padding: 20px 22px;
  border-radius: 16px;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.55;
  border: 1px solid var(--glass-border);
}
code { font-family: "Cascadia Code", "Fira Code", Consolas, Menlo, monospace; overflow-wrap: break-word; }
p code, li code {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 1px 7px;
  border-radius: 6px;
  font-size: 0.88em;
}

article.content table {
  table-layout: fixed;
  max-width: 100%;
}
article.content th,
article.content td {
  word-break: break-word;
}

.callout {
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.05);
  padding: 16px 20px;
  border-radius: 14px;
  color: var(--text-dim);
  font-weight: 300;
  margin: 1.4em 0;
}

.back-link {
  display: inline-block;
  margin-top: 24px;
  font-weight: 500;
}

/* ===========================================================
   Forms (contacts)
   =========================================================== */
form.contact-form {
  display: grid;
  gap: 18px;
  max-width: 520px;
}
form.contact-form label {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 8px;
  color: var(--text-dim);
}
form.contact-form input,
form.contact-form textarea {
  width: 100%;
  padding: 13px 20px;
  border-radius: 16px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
form.contact-form input:focus,
form.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.08);
}
form.contact-form input { border-radius: 999px; }
form.contact-form textarea { min-height: 140px; resize: vertical; border-radius: 20px; }

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 44px;
}
@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.social-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.social-list a { color: var(--text); font-weight: 500; }
.social-list li {
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
}

/* ===========================================================
   Timeline (About)
   =========================================================== */
.timeline {
  border-left: 2px solid var(--glass-border);
  padding-left: 26px;
  display: grid;
  gap: 30px;
}
.timeline .item .date { font-size: 0.8rem; color: var(--accent); font-weight: 700; letter-spacing: 0.03em; }
.timeline .item h4 { margin: 6px 0; font-weight: 700; }
.timeline .item p { margin: 0; color: var(--text-dim); font-weight: 300; }

.skills { display: flex; flex-wrap: wrap; gap: 10px; }

/* ===========================================================
   Footer
   =========================================================== */
footer.site-footer {
  padding: 22px 26px;
  margin: 40px auto 32px;
  color: var(--text-faint);
  font-size: 0.85rem;
  font-weight: 300;
  letter-spacing: 0.01em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  border-radius: 999px;
  background: var(--glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
}
footer.site-footer a { color: var(--text-dim); }
