:root {
  --bg: #070d1a;
  --bg-soft: #0d1528;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #eaf4ff;
  --text-muted: #97a8c3;
  --accent: #10a3d7;
  --accent-soft: rgba(16, 163, 215, 0.16);
  --accent-strong: rgba(16, 163, 215, 0.35);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 24px;
}

body {
  margin: 0;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background:
    radial-gradient(
      circle at top left,
      rgba(16, 163, 215, 0.14),
      transparent 30%
    ),
    radial-gradient(
      circle at 85% 20%,
      rgba(16, 163, 215, 0.1),
      transparent 25%
    ),
    linear-gradient(180deg, #070d1a 0%, #091120 100%);
  color: var(--text);
}

.container-cust {
  position: relative;
  max-width: 900px;
  margin: 80px auto;
  padding: 56px 40px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.025)
  );
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  overflow: hidden;
  isolation: isolate;
}

/* Decorative glowing background */
.container-cust::before,
.container-cust::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  z-index: -1;
  pointer-events: none;
}

.container-cust::before {
  width: 260px;
  height: 260px;
  top: -80px;
  right: -80px;
  background: radial-gradient(
    circle,
    rgba(16, 163, 215, 0.28),
    transparent 70%
  );
  filter: blur(10px);
}

.container-cust::after {
  width: 220px;
  height: 220px;
  bottom: -90px;
  left: -70px;
  background: radial-gradient(
    circle,
    rgba(16, 163, 215, 0.14),
    transparent 70%
  );
  filter: blur(12px);
}

.container-cust h1 {
  margin: 0 0 22px;
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 0.95;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: #fff;
  text-wrap: balance;
}

.container-cust h1::after {
  content: "";
  display: block;
  width: 110px;
  height: 5px;
  margin-top: 18px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(16, 163, 215, 0.15));
  box-shadow: 0 0 24px rgba(16, 163, 215, 0.45);
}

.container-cust p {
  margin: 0 0 20px;
  font-size: 1.06rem;
  line-height: 1.85;
  color: var(--text-muted);
  max-width: 72ch;
}

.container-cust p strong {
  color: var(--text);
  font-weight: 700;
}

.container-cust ul {
  list-style: none;
  padding: 0;
  margin: 34px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.container-cust ul li {
  position: relative;
  padding: 16px 18px 16px 52px;
  border-radius: 18px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.045),
    rgba(255, 255, 255, 0.025)
  );
  border: 1px solid rgba(255, 255, 255, 0.07);
  color: var(--text);
  font-weight: 500;
  line-height: 1.5;
  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    background 0.25s ease,
    box-shadow 0.25s ease;
}

.container-cust ul li::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 18px;
  width: 20px;
  height: 20px;
  transform: translateY(-50%);
  border-radius: 50%;
  background:
    radial-gradient(circle at center, #ffffff 0 22%, transparent 24%),
    linear-gradient(135deg, var(--accent), #36d1ff);
  box-shadow:
    0 0 0 6px rgba(16, 163, 215, 0.12),
    0 0 22px rgba(16, 163, 215, 0.35);
}

.container-cust ul li:hover {
  transform: translateY(-4px);
  border-color: rgba(16, 163, 215, 0.4);
  background: linear-gradient(
    180deg,
    rgba(16, 163, 215, 0.12),
    rgba(255, 255, 255, 0.03)
  );
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.25);
}

.notice {
  position: relative;
  margin-top: 34px;
  padding: 20px 22px 20px 58px;
  border-radius: 18px;
  background: linear-gradient(
    180deg,
    rgba(16, 163, 215, 0.12),
    rgba(16, 163, 215, 0.05)
  );
  border: 1px solid rgba(16, 163, 215, 0.26);
  color: #dff6ff;
  font-size: 1.3rem;
  line-height: 1.7;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.notice strong {
  color: #ffffff;
}

.notice::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 18px;
  width: 20px;
  height: 20px;
  transform: translateY(-50%);
  border-radius: 50%;
  background:
    radial-gradient(circle at center, #ffffff 0 22%, transparent 24%),
    linear-gradient(135deg, var(--accent), #36d1ff);
  box-shadow:
    0 0 0 6px rgba(16, 163, 215, 0.12),
    0 0 22px rgba(16, 163, 215, 0.35);
}
/* Nice spacing on bigger screens */
@media (min-width: 1200px) {
  .container-cust {
    padding: 68px 56px;
  }
}

/* Tablet */
@media (max-width: 768px) {
  .container-cust {
    margin: 40px 20px;
    padding: 36px 22px;
    border-radius: 20px;
  }

  .container-cust ul {
    grid-template-columns: 1fr;
  }

  .container-cust p {
    font-size: 1rem;
    line-height: 1.75;
  }
}

/* Small phones */
@media (max-width: 480px) {
  .container-cust {
    margin: 24px 14px;
    padding: 28px 18px;
  }

  .container-cust h1 {
    font-size: 2.2rem;
  }

  .container-cust ul li {
    padding: 14px 14px 14px 46px;
    border-radius: 16px;
  }

  .notice {
    padding: 18px 16px 18px 50px;
    border-radius: 16px;
  }

  .notice::before {
    left: 16px;
    top: 35px;
    width: 22px;
    height: 22px;
    font-size: 0.9rem;
  }
}
.error_page {
  min-height: 100vh;
  background:
    radial-gradient(
      circle at 20% 30%,
      rgba(16, 163, 215, 0.15),
      transparent 35%
    ),
    radial-gradient(
      circle at 80% 70%,
      rgba(16, 163, 215, 0.12),
      transparent 40%
    ),
    linear-gradient(180deg, #070d1a 0%, #091120 100%);
  color: #eaf4ff;
  position: relative;
  overflow: hidden;
}

/* subtle glowing blobs */
.error_page::before,
.error_page::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  z-index: 0;
}

.error_page::before {
  width: 300px;
  height: 300px;
  background: rgba(16, 163, 215, 0.25);
  top: -100px;
  left: -80px;
}

.error_page::after {
  width: 260px;
  height: 260px;
  background: rgba(16, 163, 215, 0.18);
  bottom: -100px;
  right: -60px;
}

.error_page .container {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

/* 404 number */
.error_page h1 {
  font-size: clamp(6rem, 18vw, 10rem);
  font-weight: 900;
  margin-bottom: 10px;
  letter-spacing: -0.05em;

  background: linear-gradient(180deg, #ffffff, #7fdfff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;

  text-shadow:
    0 0 40px rgba(16, 163, 215, 0.25),
    0 0 80px rgba(16, 163, 215, 0.15);

  animation: float404 6s ease-in-out infinite;
}

/* heading */
.error_page h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 16px;
  color: #ffffff;
}

/* paragraph */
.error_page p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #9fb3cc;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* button */
.error_page .btn {
  position: relative;
  border-radius: 999px;
  padding: 14px 28px;
  font-size: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);

  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.08),
    rgba(255, 255, 255, 0.03)
  );
  backdrop-filter: blur(10px);

  color: #fff;
  transition: all 0.3s ease;
  overflow: hidden;
}

/* button glow */
.error_page .btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(16, 163, 215, 0.4),
    transparent
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

.error_page .btn:hover::before {
  opacity: 1;
}

.error_page .btn:hover {
  transform: translateY(-3px);
  border-color: rgba(16, 163, 215, 0.5);
  box-shadow: 0 10px 30px rgba(16, 163, 215, 0.25);
}

/* icon spacing */
.error_page .btn i {
  margin-right: 8px;
}

/* floating animation */
@keyframes float404 {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* responsive tweaks */
@media (max-width: 768px) {
  .error_page {
    padding: 60px 20px;
  }

  .error_page h1 {
    font-size: 5rem;
  }

  .error_page h2 {
    font-size: 1.5rem;
  }

  .error_page p {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .error_page h1 {
    font-size: 4.2rem;
  }

  .error_page .btn {
    padding: 12px 22px;
    font-size: 0.95rem;
  }
}
.footer {
  position: relative;
  background: linear-gradient(180deg, #060b16 0%, #070d1a 100%);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 22px 20px;
  overflow: hidden;
}

/* glow accent */
.footer::before {
  content: "";
  position: absolute;
  width: 240px;
  height: 240px;
  background: rgba(16,163,215,0.12);
  filter: blur(80px);
  top: -100px;
  left: -60px;
  pointer-events: none;
}

/* layout */
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* left (brand) */
.footer-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: #ffffff;
  letter-spacing: 0.02em;
}

/* right (copyright) */
.footer-right {
  font-size: 0.85rem;
  color: #7f93b0;
}

/* subtle hover polish */
.footer-logo:hover {
  color: #10a3d7;
  text-shadow: 0 0 12px rgba(16,163,215,0.4);
  transition: all 0.25s ease;
}

/* responsive */
@media (max-width: 768px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  .footer-center p {
    font-size: 0.85rem;
  }

  .footer-right {
    font-size: 0.8rem;
  }
}