/* =========================
    DESIGN TOKENS (LIGHT + DARK READY)
========================= */

:root {
  color-scheme: light dark;
  /* ========= BRAND ========= */
  --to-primary: #b6a21a;
  --to-primary-hover: #c7b326;
  --to-primary-light: #ece5a8;
  --to-success: #22c55e;
  --to-info: #2563eb;
  --to-danger: #ef4444;
  /* ========= BACKGROUND ========= */
  --to-bg: #fcfcfd;
  --to-bg-secondary: #f6f8fb;
  --to-bg-card: #f6f8fb;
  --to-surface: rgba(255, 255, 255, 0.62);
  --to-surface-strong: rgba(255, 255, 255, 0.82);
  --to-card: #ffffff;
  /* ========= TEXT ========= */
  --to-text: #111827;
  --to-text-muted: #6b7280;
  --to-heading: #0f172a;
  /* ========= BORDER ========= */
  --to-border: #2d2d2e28;
  /* ========= EFFECT ========= */
  --to-shadow: 0 8px 40px rgba(15, 23, 42, 0.08);
  --to-shadow-hover: 0 18px 50px rgba(15, 23, 42, 0.12);
  --to-primary-glow: rgba(182, 162, 26, 0.22);
  --to-blur: 18px;
  /* spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
}

/* =========================
    DARK MODE
========================= */

@media (prefers-color-scheme: dark) {
  :root {
    --to-bg: #0f1115;
    --to-bg-secondary: #151922;
    --to-bg-card: #1c1d1a;
    --to-card: #181d27;
    --to-surface: rgba(24, 29, 39, 0.55);
    --to-surface-strong: rgba(28, 34, 45, 0.78);
    --to-text: #f3f4f6;
    --to-heading: #ffffff;
    --to-text-muted: #a1a8b6;
    --to-border: #3b3b3b;
    --to-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    --to-shadow-hover: 0 30px 70px rgba(0, 0, 0, 0.45);
    --to-primary-glow: rgba(182, 162, 26, 0.35);
  }
}

/* =========================
    BASE
========================= */

body {
  font-family: 'Inter', sans-serif;
  color: var(--to-text);

  background:
    radial-gradient(
      circle at 15% 10%,
      rgba(182, 162, 26, 0.06),
      transparent 40%
    ),
    radial-gradient(
      circle at 90% 90%,
      rgba(37, 99, 235, 0.03),
      transparent 45%
    ),
    var(--to-bg);
  transition:
    background 0.3s,
    color 0.3s;
}

@media (prefers-color-scheme: dark) {
  body {
    background:
      radial-gradient(
        circle at 20% 15%,
        rgba(182, 162, 26, 0.1),
        transparent 35%
      ),
      radial-gradient(
        circle at 85% 80%,
        rgba(37, 99, 235, 0.06),
        transparent 45%
      ),
      var(--to-bg);
  }
  .navbar-toggler {
    background-color: var(--to-primary);
  }
}

/* glass background layer */
.glass-layer::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;

  background:
    radial-gradient(
      circle at 10% 10%,
      rgba(182, 162, 26, 0.06),
      transparent 45%
    ),
    radial-gradient(
      circle at 90% 90%,
      rgba(13, 110, 253, 0.04),
      transparent 50%
    );
}

/* =========================
    NAVBAR GLASS
========================= */

.navbar-custom {
  background: var(--to-surface);
  backdrop-filter: blur(var(--to-blur));
  -webkit-backdrop-filter: blur(var(--to-blur));
  border-bottom: 1px solid var(--to-border);
  margin: 12px 16px;
  border-radius: 16px;
  transition: 0.25s ease;
}

.navbar-custom.is-scrolled {
  background: var(--to-surface-strong);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

/* nav links */
.nav-link {
  color: var(--to-text-muted) !important;
  border-radius: 10px;
  padding: 8px 12px;
}

.nav-link:hover {
  background: rgba(182, 162, 26, 0.1);
  color: var(--to-text) !important;
}

/* =========================
    GLASS SYSTEM
========================= */

.glass-card {
  background: var(--to-surface);
  backdrop-filter: blur(var(--to-blur));
  border: 1px solid var(--to-border);
  box-shadow: var(--to-shadow);
  border-radius: 22px;
  transition: 0.25s;
}

.glass-card:hover {
  background: var(--to-surface-strong);
  box-shadow: var(--to-shadow-hover);
  transform: translateY(-4px);
}

/* =========================
    BUTTONS
========================= */

.btn-primary {
  background: var(--to-primary);
  border: none;
}

.btn-primary:hover {
  background: var(--to-primary-hover);
}

.btn-outline-secondary {
  border-color: var(--to-border);

  color: var(--to-text);
}

.btn-ui-primary {
  background: var(--to-primary);
  color: #fff;
  border-radius: 12px;
  padding: 10px 16px;
  border: none;
  box-shadow: 0 10px 25px var(--to-primary-glow);
}

.btn-ui-primary:hover {
  transform: translateY(-2px);
}

/* glass button */
.btn-glass {
  background: var(--to-primary);
  border: 1px solid var(--to-border);
  border-radius: 12px;
  color: var(--to-text);
  padding: 8px 14px;
  transition: all 0.3s ease-in-out;
}
.btn-glass:hover {
  background: var(--to-primary-hover);
}

/* =========================
    TYPOGRAPHY
========================= */

h1,
h2,
h3,
h4,
h5,
h6 {
  letter-spacing: -0.03em;
  margin: 0;
}

.lead {
  color: var(--to-text-muted);
  line-height: 1.6;
}

/* =========================
    SECTIONS
========================= */

section {
  padding: var(--space-8) 0;
}

.section-title {
  font-size: 1.75rem;
  font-size: clamp(1.5rem, 1.4348rem + 0.9565vw, 1.75rem);
}

.section-subtitle {
  font-size: 1.1rem;
  font-size: clamp(1rem, 0.9565rem + 0.1739vw, 1.1rem);
  color: var(--to-text-muted);
  line-height: 1.55;
}

@media (max-width: 768px) {
  section {
    padding: var(--space-6) 0;
  }
}

/* =========================
    HERO
========================= */

.hero-section {
  background: linear-gradient(180deg, transparent, var(--to-bg-secondary));
}

.hero-title {
  font-size: 2.3rem;
  font-size: clamp(1.75rem, 1.5348rem + 0.9565vw, 2.3rem);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.2rem;
  font-size: clamp(1.1rem, 1.0609rem + 0.1739vw, 1.2rem);
  line-height: 1.45;
  color: var(--to-text-muted);
}

.hero-image-wrapper {
  position: relative;
  display: inline-block;
  will-change: transform;
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: radial-gradient(
    circle,
    rgba(182, 162, 26, 0.15),
    transparent 60%
  );
  filter: blur(40px);
  z-index: -1;
}

/* само изображение */
.hero-image {
  border-radius: 16px;
  box-shadow: 0 30px 70px rgba(15, 23, 42, 0.15);

  transform: translateZ(0);
  transition: transform 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  .hero-image {
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  }
}

/* адаптивное масштабирование */
@media (max-width: 576px) {
  .hero-image {
    transform: scale(1.02);
  }
}

@media (min-width: 992px) {
  .hero-image {
    transform: scale(1.03);
  }
}

/* =========================
    PROBLEMS LIST
========================= */

.problems-list img {
  display: block;
  width: 68%;
  margin: 0 auto 12px auto;
  object-fit: cover;
  border-radius: 12px;
}

.problems-list__card,
.audience-card {
  background-color: var(--to-bg-card);
  border: 1px solid var(--to-border);
}

.footer-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: var(--to-text-muted);
  transition:
    color 0.2s ease,
    background-color 0.2s ease,
    transform 0.2s ease;
}

.footer-social:hover {
  color: var(--to-primary);
  background: rgba(182, 162, 26, 0.12);
  transform: translateY(-2px);
}

.footer-social-icon {
  width: 22px;
  height: 22px;
  fill: currentColor;
}