:root {
  --bg: #edf2ff;
  --bg-soft: #f7fbff;
  --ink: #11182c;
  --muted: #49567a;
  --accent: #06b6d4;
  --accent-strong: #2563eb;
  --accent-soft: #ddf5ff;
  --card: rgba(255, 255, 255, 0.48);
  --line: rgba(142, 181, 236, 0.5);
  --glass-edge: rgba(255, 255, 255, 0.78);
  --shadow: 0 18px 46px rgba(23, 46, 96, 0.15);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Bahnschrift", "Segoe UI Variable", "Segoe UI", sans-serif;
  color: var(--ink);
  line-height: 1.55;
  background:
    radial-gradient(circle at 8% 12%, #ffffff 0, #ffffff 18%, transparent 52%),
    radial-gradient(circle at 94% 4%, #d8ebff 0, #d8ebff 14%, transparent 42%),
    radial-gradient(circle at 84% 75%, #ddfff8 0, #ddfff8 15%, transparent 40%),
    linear-gradient(135deg, var(--bg), var(--bg-soft));
  min-height: 100vh;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.06) 1px, transparent 1px);
  background-size: 30px 30px;
  mask-image: radial-gradient(circle at center, black 38%, transparent 86%);
}

body::after {
  content: "";
  position: fixed;
  width: 520px;
  height: 520px;
  top: -190px;
  right: -130px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(6, 182, 212, 0.35), rgba(37, 99, 235, 0.12) 62%, transparent 75%);
  filter: blur(8px);
  pointer-events: none;
  animation: drift 18s ease-in-out infinite alternate;
}

h1,
h2,
h3 {
  font-family: "Segoe UI Black", "Franklin Gothic Demi", sans-serif;
  letter-spacing: 0.01em;
  margin-top: 0;
  line-height: 1.15;
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

.section {
  padding: clamp(2rem, 4vw, 3.8rem) 0;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 0;
}

.brand {
  font-family: "Consolas", "Lucida Console", monospace;
  font-weight: 700;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: #1446af;
  letter-spacing: 0.04em;
  text-shadow: 0 0 16px rgba(6, 182, 212, 0.24);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(129, 163, 217, 0.75);
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  border-radius: 10px;
  min-height: 42px;
  padding: 0.45rem 0.85rem;
  font: inherit;
  font-weight: 700;
  backdrop-filter: blur(8px);
}

.nav-links a {
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid rgba(146, 176, 224, 0.48);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  background: rgba(255, 255, 255, 0.48);
  backdrop-filter: blur(8px);
  transition: all 180ms ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-color: rgba(37, 99, 235, 0.45);
  background: rgba(224, 246, 255, 0.8);
  color: #1046a6;
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.2) inset;
}

.hero,
.sub-header {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.56), rgba(223, 243, 255, 0.42));
  backdrop-filter: blur(10px);
}

.hero-content {
  padding: clamp(2.2rem, 6vw, 4.5rem) 0 clamp(2.8rem, 7vw, 5rem);
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.78rem;
  color: #1f4fca;
  margin-bottom: 0.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.7rem);
  max-width: 14ch;
}

.subtitle {
  max-width: 56ch;
  font-size: clamp(1rem, 2.8vw, 1.15rem);
  color: var(--muted);
}

.cta-row,
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid rgba(129, 163, 217, 0.7);
  border-radius: 12px;
  padding: 0.6rem 0.95rem;
  text-decoration: none;
  font-weight: 700;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(243, 250, 255, 0.55));
  backdrop-filter: blur(10px);
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.9), rgba(37, 99, 235, 0.94));
  border-color: rgba(37, 99, 235, 0.82);
  color: #fff;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.28);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.56);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(16, 61, 143, 0.2);
}

.shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.4;
}

.shape-one {
  width: 260px;
  height: 260px;
  background: radial-gradient(circle at 35% 35%, rgba(6, 182, 212, 0.88), rgba(37, 99, 235, 0.62));
  right: -78px;
  top: 86px;
  filter: blur(4px);
}

.shape-two {
  width: 190px;
  height: 190px;
  background: radial-gradient(circle at 30% 30%, rgba(219, 244, 255, 0.95), rgba(87, 169, 250, 0.62));
  right: 120px;
  top: -24px;
  filter: blur(3px);
}

.feature-grid,
.guide-grid,
.app-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card,
.app-card,
.highlight,
.contact-form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(0.95rem, 2.1vw, 1.25rem);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
}

.card::before,
.app-card::before,
.highlight::before,
.contact-form::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

.highlight {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.chip {
  border: 1px solid rgba(143, 177, 229, 0.75);
  background: rgba(255, 255, 255, 0.56);
  padding: 0.46rem 0.88rem;
  border-radius: 999px;
  font-weight: 700;
  color: #153455;
  cursor: pointer;
  transition: all 170ms ease;
}

.chip.active,
.chip:hover {
  background: linear-gradient(145deg, rgba(221, 245, 255, 0.95), rgba(207, 237, 255, 0.75));
  border-color: rgba(59, 130, 246, 0.55);
  color: #0a4c88;
}

.app-top {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: baseline;
}

.badge {
  background: rgba(222, 244, 255, 0.88);
  color: #0d4d76;
  font-weight: 800;
  border: 1px solid #9bcfea;
  border-radius: 999px;
  font-size: 0.76rem;
  padding: 0.22rem 0.56rem;
}

.meta,
.admin-meta,
.empty-state,
.admin-note {
  color: var(--muted);
  font-size: 0.93rem;
}

.contact-form,
.admin-form {
  max-width: 760px;
  display: grid;
  gap: 0.6rem;
}

.admin-auth-form {
  max-width: 540px;
}

.admin-subtitle {
  margin: 0.4rem 0;
  font-weight: 700;
}

.download-rows,
.admin-list {
  display: grid;
  gap: 0.6rem;
}

.download-row {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: 1fr 1.45fr;
}

.admin-fieldset {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.6rem 0.75rem;
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  background: rgba(247, 252, 255, 0.6);
  backdrop-filter: blur(8px);
}

.admin-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(8px);
}

.admin-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

input,
select,
textarea {
  border: 1px solid rgba(125, 161, 216, 0.75);
  border-radius: 10px;
  padding: 0.63rem 0.72rem;
  font: inherit;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(6px);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(37, 99, 235, 0.22);
  border-color: rgba(37, 99, 235, 0.68);
}

.footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  background: rgba(255, 255, 255, 0.52);
  backdrop-filter: blur(10px);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.2rem 0;
  font-size: 0.92rem;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
  transition: all 500ms ease;
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }

  100% {
    transform: translate3d(-35px, 30px, 0) scale(1.08);
  }
}

@media (max-width: 900px) {
  .container {
    width: min(1120px, 94vw);
  }

  .shape {
    opacity: 0.25;
  }
}

@media (max-width: 720px) {
  .nav {
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.7rem;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.4rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: max-height 240ms ease, opacity 240ms ease, transform 240ms ease;
  }

  .nav.menu-open .nav-links {
    max-height: 360px;
    opacity: 1;
    transform: translateY(0);
  }

  .nav-links a {
    white-space: nowrap;
    width: 100%;
    text-align: center;
    padding: 0.55rem 0.75rem;
  }

  .hero-content {
    padding-top: 1.8rem;
  }

  .shape {
    display: none;
  }

  .download-row {
    grid-template-columns: 1fr;
  }

  .btn,
  .chip {
    min-height: 44px;
  }
}

@media (max-width: 520px) {
  .btn-row,
  .cta-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }

  .app-top,
  .admin-item-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .feature-grid,
  .guide-grid,
  .app-grid {
    grid-template-columns: 1fr;
  }
}