/* ============================================================
   DevDen — дизайн-система (тёмная техно-эстетика)
   Все .dd-* классы. glassmorphism + neon + scroll-reveal.
   ============================================================ */

/* ---------- Layout primitives ---------- */
.dd-section { padding: 6rem 0; position: relative; }
.dd-section--tight { padding: 4rem 0; }
.dd-container { max-width: 1140px; margin: 0 auto; padding: 0 1.25rem; width: 100%; }
.dd-main { padding-top: 80px; /* fixed navbar height */ }

.dd-section__head { text-align: center; margin-bottom: 3.5rem; }
.dd-section__eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 600; letter-spacing: .2em;
  text-transform: uppercase; color: var(--dd-cyan); margin-bottom: .75rem;
}
.dd-section__title { margin-bottom: .5rem; }
.dd-section__subtitle { color: var(--dd-text-muted); max-width: 640px; margin: 0 auto; font-size: 1.05rem; }

.dd-logo { display: inline-flex; align-items: center; gap: .5rem; }
.dd-logo__mark { display: block; }

.dd-footer__brand { display: inline-flex; align-items: center; gap: .5rem; }
.dd-footer__brand .dd-logo__mark { width: 24px; height: 24px; }

.dd-gradient-text {
  background: linear-gradient(90deg, #22d3ee 0%, #38bdf8 30%, #8b5cf6 100%);
  background-size: 100% 100%;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- Buttons ---------- */
.dd-btn-primary, .dd-btn-ghost {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.8rem; border-radius: 50px; font-weight: 600; font-size: .95rem;
  border: none; cursor: pointer; transition: all .25s ease; text-decoration: none;
  font-family: var(--dd-font);
}
.dd-btn-primary {
  background-image: linear-gradient(90deg, #22d3ee 0%, #8b5cf6 100%);
  background-size: 160% 100%; background-position: 0% 50%; color: #fff;
  box-shadow: var(--dd-glow), 0 4px 18px rgba(139, 92, 246, 0.35);
}
.dd-btn-primary:hover { transform: translateY(-2px); background-position: 100% 50%; box-shadow: 0 0 32px rgba(124, 58, 237, 0.5); color: #fff; }
.dd-btn-ghost {
  background: transparent; color: var(--dd-text);
  border: 1px solid var(--dd-border);
}
.dd-btn-ghost:hover { border-color: var(--dd-cyan); color: var(--dd-cyan); transform: translateY(-2px); }

/* ---------- Cards ---------- */
.dd-card {
  background: var(--dd-bg-card); border: 1px solid var(--dd-border);
  border-radius: var(--dd-radius); padding: 1.75rem;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.dd-card:hover { transform: translateY(-6px); border-color: rgba(0, 212, 255, 0.4); box-shadow: var(--dd-shadow); }

/* ---------- Contact success (замена формы после отправки) ---------- */
.dd-contact-success {
  text-align: center; padding: 3rem 1.5rem;
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
  animation: dd-success-in .6s ease both;
}
.dd-contact-success__icon {
  width: 84px; height: 84px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.4);
  color: var(--dd-cyan);
  box-shadow: 0 0 40px rgba(0, 212, 255, 0.25), inset 0 0 20px rgba(0, 212, 255, 0.08);
}
.dd-contact-success__icon svg { filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.6)); }
.dd-contact-success__title { font-size: 1.6rem; margin: 0; }
.dd-contact-success__text { color: var(--dd-text-muted); max-width: 420px; margin: 0; }
@keyframes dd-success-in {
  from { opacity: 0; transform: translateY(16px) scale(.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---------- Hero ---------- */
.dd-hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  overflow: hidden; padding-top: 80px;
}
#dd-hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0;
}
#dd-hero-canvas canvas { display: block; width: 100% !important; height: 100% !important; }
.dd-hero__bg {
  position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(ellipse at 30% 20%, rgba(34, 211, 238, 0.22), transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(139, 92, 246, 0.25), transparent 50%),
              var(--dd-bg);
}
/* Light mode: soft pastel grey-beige hero backdrop — a few shades darker than page --dd-bg (#f6f8fb), not white */
[data-bs-theme="light"] .dd-hero__bg {
  background: radial-gradient(ellipse at 30% 20%, rgba(0, 120, 160, 0.24), transparent 55%),
              radial-gradient(ellipse at 70% 80%, rgba(90, 40, 180, 0.20), transparent 55%),
              linear-gradient(160deg, #e9edf2 0%, #e3e0d9 55%, #dcdfe6 100%);
}
.dd-hero__content { position: relative; z-index: 2; width: 100%; transform: translateY(-11vh); }
.dd-hero__badge {
  display: inline-flex; align-items: center; gap: .5rem; padding: .4rem 1rem;
  background: var(--dd-bg-card); border: 1px solid var(--dd-border); border-radius: 50px;
  font-size: .8rem; color: var(--dd-text-muted); margin-bottom: 1.5rem; backdrop-filter: blur(8px);
}
.dd-hero__badge::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--dd-green); box-shadow: 0 0 8px var(--dd-green); }
.dd-hero__title { font-size: clamp(2.5rem, 6vw, 5rem); margin-bottom: 1.25rem; }
.dd-hero__subtitle { font-size: clamp(1.05rem, 2vw, 1.4rem); color: var(--dd-text); max-width: 620px; margin-bottom: 2.5rem; line-height: 1.75; }
.dd-hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- Stats ---------- */
.dd-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.dd-stat { text-align: center; }
.dd-stat__num {
  font-size: clamp(2rem, 4vw, 3.2rem); font-weight: 800; line-height: 1;
}
.dd-stat__label { color: var(--dd-text-muted); font-size: .9rem; margin-top: .5rem; text-transform: uppercase; letter-spacing: .1em; }

/* ---------- Features ---------- */
.dd-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.dd-feature__icon {
  width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: var(--dd-accent-grad); font-size: 1.4rem; margin-bottom: 1rem; color: #fff;
}
.dd-feature__title { font-size: 1.15rem; margin-bottom: .5rem; }
.dd-feature__text { color: var(--dd-text-muted); font-size: .95rem; margin: 0; }

/* ---------- Bio ---------- */
.dd-bio { display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; align-items: center; }
.dd-bio__photo {
  width: 100%; aspect-ratio: 1; border-radius: var(--dd-radius);
  background: var(--dd-accent-grad); position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center; font-size: 4rem; color: #fff;
  padding: 6px; border: 2px solid var(--dd-border);
}
.dd-bio__photo img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  border-radius: calc(var(--dd-radius) - 4px); display: block; position: relative; z-index: 1;
}
.dd-bio__photo::after { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.25), transparent 60%); pointer-events: none; }

/* ---------- Service preview cards ---------- */
.dd-service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.dd-service-card__cat { font-size: .8rem; color: var(--dd-cyan); text-transform: uppercase; letter-spacing: .1em; margin-bottom: .5rem; }
.dd-service-card__title { font-size: 1.2rem; margin-bottom: .75rem; }
.dd-service-card__desc { color: var(--dd-text-muted); font-size: .95rem; margin-bottom: 1rem; }

/* ---------- CTA ---------- */
.dd-cta {
  text-align: center; padding: 4rem 2rem; border-radius: 20px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(124, 58, 237, 0.18));
  border: 1px solid var(--dd-border);
}
.dd-cta__title { margin-bottom: 1rem; }
.dd-cta__text { color: var(--dd-text-muted); margin-bottom: 2rem; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ---------- Timeline (resume) ---------- */
.dd-timeline { position: relative; padding-left: 2rem; }
.dd-timeline::before { content: ""; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px; background: var(--dd-accent-grad); }
.dd-timeline__item { position: relative; margin-bottom: 2.5rem; }
.dd-timeline__item::before {
  content: ""; position: absolute; left: -2rem; top: .4rem; width: 14px; height: 14px;
  border-radius: 50%; background: var(--dd-cyan); box-shadow: 0 0 12px var(--dd-cyan);
  border: 2px solid var(--dd-bg);
}
.dd-timeline__date { font-size: .85rem; color: var(--dd-cyan); margin-bottom: .25rem; }
.dd-timeline__title { font-size: 1.15rem; margin-bottom: .25rem; }
.dd-timeline__company { color: var(--dd-text-muted); font-size: .95rem; margin-bottom: .5rem; }
.dd-timeline__desc { color: var(--dd-text-muted); font-size: .95rem; margin: 0; }

/* ---------- Education cards ---------- */
.dd-edu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

/* ---------- Skill bars ---------- */
.dd-skill-group { margin-bottom: 2.5rem; }
.dd-skill-group__title { font-size: 1.1rem; margin-bottom: 1.25rem; }
.dd-skill { margin-bottom: 1rem; }
.dd-skill__head { display: flex; justify-content: space-between; margin-bottom: .4rem; font-size: .9rem; }
.dd-skill__name { font-weight: 500; }
.dd-skill__level { color: var(--dd-text-muted); }
.dd-skill-bar { height: 8px; background: var(--dd-bg-card); border-radius: 4px; overflow: hidden; }
.dd-skill-bar__fill { height: 100%; background: var(--dd-accent-grad); border-radius: 4px; width: 0; transition: width 1.2s cubic-bezier(.16,1,.3,1); }

/* ---------- Services table ---------- */
.dd-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.dd-table th, .dd-table td { padding: 1rem 1.25rem; text-align: left; border-bottom: 1px solid var(--dd-border); }
.dd-table th { color: var(--dd-cyan); font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; }
.dd-table tbody tr { transition: background .2s ease; }
.dd-table tbody tr:hover { background: var(--dd-bg-card); }
.dd-table__price { font-weight: 700; color: var(--dd-green); white-space: nowrap; }
.dd-service-cat { margin-bottom: 2.5rem; }
.dd-service-cat__title { font-size: 1.3rem; margin-bottom: .25rem; }
.dd-service-cat__title::before { content: "//"; color: var(--dd-magenta); margin-right: .5rem; }

/* ---------- Form ---------- */
.dd-form { display: grid; gap: 1.25rem; }
.dd-form .form-control, .dd-form textarea {
  background: var(--dd-bg-card); border: 1px solid var(--dd-border); color: var(--dd-text);
  border-radius: 10px; padding: .9rem 1rem; transition: border-color .2s ease, box-shadow .2s ease;
}
.dd-form .form-control:focus, .dd-form textarea:focus {
  border-color: var(--dd-cyan); box-shadow: 0 0 0 .2rem rgba(0, 212, 255, 0.15);
  background: var(--dd-bg-card); color: var(--dd-text);
}
.dd-form .form-label { color: var(--dd-text-muted); font-size: .85rem; margin-bottom: .4rem; }
.dd-contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 3rem; }
.dd-contact-info { display: grid; gap: 1.25rem; }
.dd-contact-info__item { display: flex; gap: 1rem; align-items: flex-start; }
.dd-contact-info__icon { width: 40px; height: 40px; border-radius: 10px; background: var(--dd-bg-card); border: 1px solid var(--dd-border); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--dd-cyan); flex-shrink: 0; }
.dd-social { display: flex; gap: .75rem; }
.dd-social__link { width: 42px; height: 42px; border-radius: 10px; background: var(--dd-bg-card); border: 1px solid var(--dd-border); display: flex; align-items: center; justify-content: center; color: var(--dd-text-muted); transition: all .25s ease; }
.dd-social__link:hover { color: var(--dd-cyan); border-color: var(--dd-cyan); transform: translateY(-3px); }

/* ---------- Error pages ---------- */
.dd-error { min-height: 60vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 4rem 1.25rem; }
.dd-error__code { font-size: clamp(5rem, 15vw, 12rem); font-weight: 800; line-height: 1; }
.dd-error__title { font-size: 1.6rem; margin-bottom: .75rem; }
.dd-error__text { color: var(--dd-text-muted); margin-bottom: 2rem; max-width: 480px; }

/* ---------- Footer ---------- */
.dd-footer { background: var(--dd-bg-alt); border-top: 1px solid var(--dd-border); padding: 3rem 0 1.5rem; margin-top: 4rem; }
.dd-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
.dd-footer__brand { font-size: 1.5rem; font-weight: 800; margin-bottom: .5rem; }
.dd-footer__desc { color: var(--dd-text-muted); font-size: .9rem; max-width: 320px; }
.dd-footer__heading { font-size: .85rem; text-transform: uppercase; letter-spacing: .15em; color: var(--dd-cyan); margin-bottom: 1rem; }
.dd-footer__links { list-style: none; padding: 0; margin: 0; display: grid; gap: .6rem; }
.dd-footer__links a { color: var(--dd-text-muted); font-size: .9rem; }
.dd-footer__links a:hover { color: var(--dd-cyan); }
.dd-footer__bottom { border-top: 1px solid var(--dd-border); padding-top: 1.5rem; text-align: center; color: var(--dd-text-muted); font-size: .85rem; }

/* ---------- Navbar ---------- */
.dd-navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1030;
  background: rgba(15, 23, 42, 0.8); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dd-border);
}
[data-bs-theme="light"] .dd-navbar { background: rgba(255, 255, 255, 0.8); }
.dd-navbar__inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.dd-navbar__brand { font-size: 1.4rem; font-weight: 800; text-decoration: none; }
.dd-navbar__nav { display: flex; align-items: center; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.dd-navbar__nav a {
  color: var(--dd-text-muted); padding: .5rem .9rem; border-radius: 8px; font-weight: 500; font-size: .95rem; transition: all .2s ease;
}
.dd-navbar__nav a:hover, .dd-navbar__nav a.active { color: var(--dd-text); background: var(--dd-bg-card); }
.dd-navbar__nav a.dd-nav-harness {
  color: var(--dd-accent, #00d4ff); font-weight: 600; position: relative;
}
.dd-navbar__nav a.dd-nav-harness::after {
  content: ''; position: absolute; left: .9rem; right: .9rem; bottom: .25rem; height: 2px;
  border-radius: 2px; background: linear-gradient(90deg, #00d4ff, #7c3aed);
  opacity: .55; transition: opacity .2s ease;
}
.dd-navbar__nav a.dd-nav-harness:hover::after, .dd-navbar__nav a.dd-nav-harness.active::after { opacity: 1; }
.dd-navbar__toggle { display: none; }
.dd-theme-toggle { background: var(--dd-bg-card); border: 1px solid var(--dd-border); color: var(--dd-text); width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 1rem; display: flex; align-items: center; justify-content: center; }

/* ---------- Scroll reveal ---------- */
.dd-reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.dd-reveal.dd-visible { opacity: 1; transform: translateY(0); }

/* ---------- Helpers ---------- */
.dd-empty { color: var(--dd-text-muted); font-style: italic; padding: 2rem; text-align: center; }
.dd-text-muted { color: var(--dd-text-muted); }
.dd-mt-2 { margin-top: 2rem; }
.dd-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

/* ---------- Generic grids (harness & reuse) ---------- */
.dd-grid { display: grid; gap: 1.5rem; }
.dd-grid--2 { grid-template-columns: repeat(2, 1fr); }
.dd-grid--3 { grid-template-columns: repeat(3, 1fr); }
.dd-grid--4 { grid-template-columns: repeat(4, 1fr); }
.dd-card__title { font-size: 1.15rem; margin-bottom: .5rem; }
.dd-card__text { color: var(--dd-text-muted); font-size: .95rem; margin: 0; }

/* ---------- Button aliases (dd-btn + modifier) ---------- */
.dd-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.8rem; border-radius: 50px; font-weight: 600; font-size: .95rem;
  border: none; cursor: pointer; transition: all .25s ease; text-decoration: none;
  font-family: var(--dd-font);
}
.dd-btn--primary { background-image: linear-gradient(90deg, #22d3ee 0%, #8b5cf6 100%); background-size: 160% 100%; background-position: 0% 50%; color: #fff; box-shadow: var(--dd-glow), 0 4px 18px rgba(139, 92, 246, 0.35); }
.dd-btn--primary:hover { transform: translateY(-2px); background-position: 100% 50%; box-shadow: 0 0 32px rgba(124, 58, 237, 0.5); color: #fff; }
.dd-btn--ghost { background: transparent; color: var(--dd-text); border: 1px solid var(--dd-border); }
.dd-btn--ghost:hover { border-color: var(--dd-cyan); color: var(--dd-cyan); transform: translateY(-2px); }

/* ---------- Badge ---------- */
.dd-badge {
  display: inline-flex; align-items: center; gap: .5rem; padding: .4rem 1rem;
  background: var(--dd-bg-card); border: 1px solid var(--dd-border); border-radius: 50px;
  font-size: .8rem; color: var(--dd-text-muted); margin-bottom: 1.5rem; backdrop-filter: blur(8px);
}

/* ---------- Prose ---------- */
.dd-prose { font-size: 1.05rem; line-height: 1.75; color: var(--dd-text); }
.dd-prose--narrow { max-width: 760px; margin: 0 auto; }
.dd-prose--center { max-width: 820px; margin-left: auto; margin-right: auto; text-align: center; }
.dd-prose p { margin-bottom: 1.25rem; }
.dd-text--lead { font-size: 1.15rem; color: var(--dd-text-muted); }

/* ---------- Lists ---------- */
.dd-list { list-style: none; padding: 0; margin: 1.5rem 0; display: grid; gap: 1rem; }
.dd-list li { padding-left: 1.5rem; position: relative; color: var(--dd-text-muted); line-height: 1.6; }
.dd-list li::before { content: ""; position: absolute; left: 0; top: .55rem; width: 8px; height: 8px; border-radius: 50%; background: var(--dd-accent-grad); }

/* ---------- Stats (harness) ---------- */
.dd-stats--harness { grid-template-columns: repeat(4, 1fr); margin-top: 2.5rem; }
.dd-stat__num { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; line-height: 1; }

/* ---------- Pipeline ---------- */
.dd-pipeline { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.dd-pipeline--grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.dd-pipeline li {
  counter-increment: step; position: relative; padding: 1.4rem 1.4rem 1.4rem 3.4rem;
  background: var(--dd-bg-card); border: 1px solid var(--dd-border); border-radius: var(--dd-radius);
  color: var(--dd-text-muted); font-size: .95rem; line-height: 1.5; transition: border-color .25s ease;
}
.dd-pipeline li::before {
  content: counter(step); position: absolute; left: 1rem; top: 1.2rem;
  width: 28px; height: 28px; border-radius: 50%; background: var(--dd-accent-grad);
  color: #fff; font-weight: 700; font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
}
.dd-pipeline li:hover { border-color: rgba(0, 212, 255, 0.4); }
.dd-pipeline li strong { color: var(--dd-text); }

/* ---------- Kanban screenshot frame ---------- */
.dd-kanban-frame { margin: 0; }
.dd-kanban-frame img {
  display: block; width: 100%; height: auto; border-radius: var(--dd-radius);
  border: 1px solid var(--dd-border); box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  background: var(--dd-bg-card);
}
.dd-kanban-caption {
  text-align: center; color: var(--dd-text-muted); font-size: .9rem;
  margin-top: 1rem; max-width: 720px; margin-left: auto; margin-right: auto; line-height: 1.5;
}

/* ---------- Tech chips ---------- */
.dd-tech-grid { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; }
.dd-tech-chip {
  padding: .55rem 1.1rem; border-radius: 50px; font-size: .9rem; font-weight: 500;
  background: var(--dd-bg-card); border: 1px solid var(--dd-border); color: var(--dd-text);
  transition: all .25s ease;
}
.dd-tech-chip:hover { border-color: var(--dd-cyan); color: var(--dd-cyan); transform: translateY(-2px); }

/* ---------- CTA box ---------- */
.dd-cta-box {
  text-align: center; padding: 2.5rem 2rem; border-radius: var(--dd-radius);
  margin-top: 2rem; background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(124, 58, 237, 0.16));
  border: 1px solid var(--dd-border);
}
.dd-cta-box h3 { font-size: 1.4rem; margin-bottom: .5rem; }
.dd-cta-box p { color: var(--dd-text-muted); margin-bottom: 1.5rem; }

/* ---------- Hero harness (two-col fallback) ---------- */
.dd-hero__inner--two-col { width: 100%; }

/* ---------- Section alt background ---------- */
.dd-section--alt { background: var(--dd-bg-alt, rgba(255, 255, 255, 0.02)); }

/* ---------- Responsive ---------- */
@media (max-width: 992px) {
  .dd-stats { grid-template-columns: repeat(2, 1fr); }
  .dd-features { grid-template-columns: repeat(2, 1fr); }
  .dd-service-grid { grid-template-columns: repeat(2, 1fr); }
  .dd-bio { grid-template-columns: 1fr; }
  .dd-contact-grid { grid-template-columns: 1fr; }
  .dd-footer__grid { grid-template-columns: 1fr 1fr; }
  .dd-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .dd-stats--harness { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .dd-section { padding: 4rem 0; }
  .dd-navbar__nav { display: none; position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--dd-bg-alt); border-bottom: 1px solid var(--dd-border); padding: 1rem; gap: 0; }
  .dd-navbar__nav.dd-open { display: flex; }
  .dd-navbar__nav a { padding: .8rem 1rem; }
  .dd-navbar__toggle { display: inline-flex; background: var(--dd-bg-card); border: 1px solid var(--dd-border); color: var(--dd-text); border-radius: 10px; width: 42px; height: 42px; align-items: center; justify-content: center; cursor: pointer; font-size: 1.2rem; }
  .dd-features, .dd-service-grid, .dd-edu-grid, .dd-grid-2 { grid-template-columns: 1fr; }
  .dd-grid--3, .dd-grid--4 { grid-template-columns: 1fr; }
  .dd-footer__grid { grid-template-columns: 1fr; }
}
@media (max-width: 576px) {
  .dd-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .dd-hero__actions { flex-direction: column; align-items: stretch; }
  .dd-btn-primary, .dd-btn-ghost { justify-content: center; }
}