:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: #d8e0ee;
  --brand: #0ea5a5;
  --brand-2: #2563eb;
  --accent: #f59e0b;
  --shadow: 0 12px 34px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(14, 165, 165, 0.2), transparent 34%),
    radial-gradient(circle at 85% 18%, rgba(37, 99, 235, 0.16), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, #eff4fb 100%);
  min-height: 100vh;
}

.frontpage {
  position: relative;
}

.frontpage-watermark {
  position: fixed;
  right: max(2.5vw, 1rem);
  bottom: 1rem;
  width: min(30vw, 340px);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

.frontpage-watermark img {
  display: block;
  width: 100%;
  height: auto;
}

a {
  color: inherit;
}

.shell {
  width: min(1200px, 92vw);
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
  position: relative;
  z-index: 1;
}

.hero {
  background: linear-gradient(130deg, #0f172a 0%, #1e293b 58%, #0e7490 100%);
  color: #fff;
  border-radius: 28px;
  padding: 1.15rem 1.35rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.hero-tool-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: 52px;
  padding: 0.55rem 0.8rem;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.18);
  backdrop-filter: blur(8px);
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
  text-decoration: none;
}

.hero-tool-link:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.36);
}

.hero-tool-link img {
  display: block;
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.hero-tool-link span {
  display: inline-block;
  max-width: 18ch;
  color: #f8fbff;
  font-size: 0.85rem;
  font-weight: 800;
  line-height: 1.15;
  text-align: left;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  filter: blur(2px);
}

.hero::before {
  width: 320px;
  height: 320px;
  background: rgba(245, 158, 11, 0.28);
  top: -120px;
  right: -120px;
}

.hero::after {
  width: 250px;
  height: 250px;
  background: rgba(14, 165, 165, 0.3);
  left: -90px;
  bottom: -110px;
}

.hero h1 {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: clamp(1.35rem, 1.5vw + 0.95rem, 2.15rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  max-width: 24ch;
}

.hero p {
  margin: 1rem 0 0;
  max-width: 65ch;
  color: #dbeafe;
  line-height: 1.6;
}

.legend {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.4rem 0.72rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.badge-device {
  background: rgba(14, 165, 165, 0.2);
  border: 1px solid rgba(45, 212, 191, 0.5);
}

.badge-synced {
  background: rgba(59, 130, 246, 0.2);
  border: 1px solid rgba(96, 165, 250, 0.52);
}

.badge-auto {
  background: rgba(251, 191, 36, 0.2);
  border: 1px solid rgba(252, 211, 77, 0.5);
}

.badge-attestation {
  background: rgba(129, 140, 248, 0.2);
  border: 1px solid rgba(165, 180, 252, 0.52);
}

.columns {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.25rem;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.06);
}

.panel h2 {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: -0.02em;
}

.section-note {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.group {
  margin-top: 1.2rem;
}

.group h3 {
  margin: 0 0 0.7rem;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #0f3c80;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.card-link {
  text-decoration: none;
  border: 1px solid #d5ddec;
  background: linear-gradient(180deg, #ffffff 0%, #f7fafe 100%);
  border-radius: 15px;
  padding: 1rem;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.8rem;
  text-align: center;
}

.card-link:hover {
  transform: translateY(-3px);
  border-color: #81a8ed;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.12);
}

.card-logo-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  min-height: 48px;
}

.card-logo-stack {
  display: grid;
  gap: 0.35rem;
  width: 100%;
}

.card-logo-stack .top-row,
.card-logo-stack .bottom-row {
  min-height: 0;
}

.logo-chip-top {
  width: 52px;
  height: 52px;
  border-radius: 14px;
}

.logo-chip {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  border: 1px solid #d9e1f0;
  background: #ffffff;
  display: grid;
  place-items: center;
  padding: 0.3rem;
}

.card-logo-row .logo-chip:only-child {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  padding: 0.36rem;
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-link h4 {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.34;
}

.page {
  width: min(900px, 92vw);
  margin: 0 auto;
  padding: 2.2rem 0 3rem;
}

.back {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
  color: #0f3c80;
  margin-bottom: 1.2rem;
}

.topic {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 1.6rem;
}

.topic h1 {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: clamp(1.6rem, 1.6vw + 1rem, 2.3rem);
}

.topic p {
  color: var(--muted);
  line-height: 1.65;
}

.todo {
  border-left: 4px solid var(--brand);
  background: #ecfeff;
  border-radius: 12px;
  padding: 0.8rem 1rem;
}

.video-frame {
  position: relative;
  width: 100%;
  margin-top: 0.9rem;
  border-radius: 18px;
  overflow: hidden;
  background: #dbe4f3;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}

.video-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.link-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.link-list li {
  margin: 0.55rem 0;
  background: #f8fafc;
  border: 1px dashed #c8d4ea;
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
}

.tech-card {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid #d7e1f2;
  border-radius: 14px;
  background: linear-gradient(180deg, #fbfdff 0%, #f3f7fc 100%);
}

.tech-card h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.tech-card p {
  margin: 0;
}

.tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.tech-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

.tech-label {
  font-weight: 700;
  color: #0f172a;
}

.tech-code {
  font-family: "Consolas", "SFMono-Regular", monospace;
  font-size: 0.87rem;
  color: #0f3c80;
  background: #e8f0ff;
  border: 1px solid #c8d8fb;
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
}

.copy-button {
  border: 1px solid #c8d8fb;
  background: #ffffff;
  color: #0f3c80;
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover {
  background: #eef4ff;
}

.copy-button.copied {
  border-color: #8fd3c5;
  background: #ecfdf5;
  color: #0f766e;
}

.tech-note {
  color: var(--muted);
  font-size: 0.92rem;
}

footer {
  margin-top: 1.3rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.reveal {
  opacity: 0;
  transform: translateY(10px);
  animation: reveal 550ms ease forwards;
}

.reveal:nth-child(2) {
  animation-delay: 140ms;
}

@keyframes reveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .columns {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  .frontpage-watermark {
    width: min(42vw, 200px);
    opacity: 0.06;
  }

  .hero-topbar {
    align-items: center;
  }

  .hero-tool-link {
    min-height: 46px;
    padding: 0.5rem 0.65rem;
    border-radius: 12px;
    gap: 0.5rem;
  }

  .hero-tool-link img {
    width: 22px;
    height: 22px;
  }

  .hero-tool-link span {
    max-width: 14ch;
    font-size: 0.76rem;
  }

  .hero {
    padding: 1rem 1.05rem;
  }

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

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