:root {
  --primary: #20bec8;
  --primary-strong: #18aab3;
  --text: #1f2733;
  --muted: #566272;
  --border: #e6e8eb;
  --surface: #ffffff;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(130deg, #e9f7f9 0%, #f4f8ff 52%, #e8f1ff 100%),
    linear-gradient(210deg, rgba(32, 190, 200, 0.15) 0%, rgba(32, 190, 200, 0) 42%);
  color: var(--text);
  display: grid;
  place-items: center;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, rgba(24, 170, 179, 0.12) 18%, rgba(255, 255, 255, 0) 50%),
    linear-gradient(295deg, rgba(32, 190, 200, 0.12) 10%, rgba(255, 255, 255, 0) 48%);
  opacity: 0.9;
  z-index: 0;
}

body::after {
  content: "Rinn.Moe";
  position: fixed;
  bottom: -2vh;
  left: -2vw;
  font-size: 140px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: rgba(32, 190, 200, 0.12);
  pointer-events: none;
  user-select: none;
  z-index: 0;
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.canvas {
  text-align: center;
  padding: 36px 30px;
  background: #ffffff;
  border: 1px solid rgba(230, 232, 235, 0.7);
  border-radius: 18px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.04);
  max-width: 720px;
  width: 88vw;
  position: relative;
  z-index: 1;
}

.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 10px;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.01em;
}

.title {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 10px;
}

.app-icon {
  width: clamp(44px, 6vw, 64px);
  height: clamp(44px, 6vw, 64px);
  border-radius: 18%;
  flex-shrink: 0;
}

.title h1 {
  margin: 0;
}

.lead {
  margin: 0 auto 24px;
  color: var(--muted);
  max-width: 540px;
  line-height: 1.6;
}

.actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.btn {
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 700;
  border: 1px solid var(--border);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.btn.primary {
  background: var(--primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 2px 6px rgba(32, 190, 200, 0.25);
}

.btn.primary:hover {
  background: var(--primary-strong);
  transform: translateY(-1px);
}

.btn.ghost {
  background: #f6f8fa;
  color: var(--text);
}

.btn.ghost:hover {
  border-color: #d2d7dd;
  transform: translateY(-1px);
}

.meta {
  margin: 0;
  color: var(--muted);
  font-weight: 600;
}