/* =====================
   DESIGN TOKENS
===================== */
:root {
  --font-base: "Inter", system-ui, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 6px 18px rgba(0,0,0,.06);
  --shadow-md: 0 18px 40px rgba(0,0,0,.10);

  --transition: 220ms ease;
}

/* Light */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --surface: #ffffff;

  --text-main: #0b1c2d;
  --text-muted: #6b7280;

  --primary: #2563eb;
  --primary-soft: #e0e7ff;

  --border: #e5e7eb;
}

/* Dark */
[data-theme="dark"] {
  --bg: #050c14;
  --bg-soft: #0b1420;
  --surface: #071224;

  --text-main: #e5eef8;
  --text-muted: #9aa6b2;

  --primary: #60a5fa;
  --primary-soft: #1e3a8a;

  --border: rgba(255,255,255,.08);
}

/* Base */
html { font-size: clamp(14px, 1vw + 10px, 16px); }

body {
  font-family: var(--font-base);
  background: var(--bg);
  color: var(--text-main);
  transition: background var(--transition), color var(--transition);
}

/* Navbar */
.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.navbar-brand, .nav-link { color: var(--text-main)!important; }
.nav-link:hover { color: var(--primary)!important; }

/* Hero */
.hero {
  padding: clamp(5rem, 7vw, 8rem) 0;
  background:
    radial-gradient(70% 70% at 10% 10%, var(--primary-soft), transparent),
    linear-gradient(135deg, var(--bg-soft), var(--bg));
}

.hero h1 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero p { color: var(--text-muted); max-width: 560px; }

/* Sections */
section { padding: clamp(4rem, 6vw, 6.5rem) 0; }

.section-title { font-weight: 600; }
.section-subtitle {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 3rem;
}

/* Cards */
.card-ui {
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 2.2rem;
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card-ui:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

/* CTA */
.cta {
  background:
    linear-gradient(135deg, var(--primary), #1e40af);
  color: #fff;
}

/* Footer */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

/* Fixes */
.text-muted { color: var(--text-muted)!important; }
.bg-light { background: var(--bg-soft)!important; }
.bg-white { background: var(--surface)!important; }


/* =====================
   NAVBAR MOBILE FIX
===================== */
:root {
  --navbar-height: 72px;
}

/* offset for fixed navbar */
body {
  padding-top: var(--navbar-height);
}

/* navbar sizing */
.navbar {
  min-height: var(--navbar-height);
}

/* mobile menu surface */
@media (max-width: 991px) {
  .navbar-collapse {
    position: absolute;
    top: calc(var(--navbar-height) + 8px);
    left: 1rem;
    right: 1rem;

    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 1.25rem;

    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);

    /* АНИМАЦИЯ */
    opacity: 0;
    transform: translateY(-8px) scale(0.98);
    pointer-events: none;

    transition:
      opacity 180ms ease,
      transform 220ms cubic-bezier(.2,.7,.3,1);
  }

  .navbar-collapse.show {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }

  .navbar-collapse {
    will-change: transform, opacity;
  }

  .navbar-nav {
    gap: .25rem;
  }

  .navbar-nav .nav-link {
    padding: .75rem 0;
    font-weight: 500;
  }
}

/* =====================
   CUSTOM TOGGLER
===================== */
.navbar-toggler {
  border: none;
  padding: .4rem .5rem;
}

.navbar-toggler:focus {
  box-shadow: none;
}

.navbar-toggler-icon {
  background-image: none;
  width: 26px;
  height: 18px;
  position: relative;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after,
.navbar-toggler-icon span {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all .25s ease;
}

.navbar-toggler-icon::before {
  top: 0;
}

.navbar-toggler-icon span {
  top: 8px;
}

.navbar-toggler-icon::after {
  bottom: 0;
}

/* animated state */
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
  transform: rotate(45deg);
  top: 8px;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon span {
  opacity: 0;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
  transform: rotate(-45deg);
  bottom: 8px;
}


@media (max-width: 991px) {
  .navbar .btn {
    width: 100%;
    margin: .5rem 0 0;
  }
}

/* фикс высоты верхней линии navbar */
.navbar > .container {
  min-height: var(--navbar-height);
  align-items: center;
}

@media (max-width: 991px) {

  .navbar-collapse {
    position: absolute;
    top: var(--navbar-height);
    left: 1rem;
    right: 1rem;

    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 1.25rem;

    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
  }
}

.hero {
  scroll-margin-top: calc(var(--navbar-height) + 16px);
}

/* отключаем height-анимацию bootstrap, но оставляем свои */
.navbar-collapse.collapsing {
  height: auto !important;
  transition: none !important;
}

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: calc(var(--navbar-height) + 16px);
}