:root {
  --text: #5b4c55;
  --text-soft: #7c6a7a;
  --heading: #4a3b4d;
  --accent: #d76b7d;
  --shadow-soft: 0 18px 40px rgba(113, 83, 79, 0.18);
  --border-soft: rgba(255, 255, 255, 0.9);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Noto Sans JP", "Segoe UI", sans-serif;
  --font-script: "Snell Roundhand", "Zapfino", "Palatino", "Times New Roman",
    serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100vh;
}

body {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.6;
  color: var(--text);
  background: radial-gradient(circle at top, #fde9f2 0, #fdf8f1 45%, #f2f7ff 90%);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
p {
  margin: 0;
}

.app-shell {
  position: relative;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 24px;
  display: flex;
  flex-direction: column;
}

.invitation-background {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: -2;
}

.invitation-background-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.1) brightness(1.05);
  opacity: 0.9;
}

.invitation-background-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.75), transparent 55%),
    radial-gradient(circle at bottom, rgba(244, 218, 190, 0.6), transparent 55%);
  box-shadow: inset 0 0 160px rgba(213, 163, 167, 0.7);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 22px;
  border-radius: 20px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.96),
    rgba(255, 247, 241, 0.96)
  );
  border: 1px solid var(--border-soft);
  box-shadow: 0 18px 40px rgba(180, 134, 132, 0.22);
  backdrop-filter: blur(14px);
}

.app-title {
  flex: 1;
  text-align: left;
}

.names {
  display: block;
  font-family: var(--font-script);
  font-size: 30px;
  letter-spacing: 0.08em;
  color: var(--heading);
}

.subtitle {
  display: block;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-soft);
}

.nav {
  display: flex;
  gap: 10px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-soft);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid transparent;
  transition:
    background 0.25s ease,
    color 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.nav-link:hover {
  border-color: rgba(227, 170, 184, 0.9);
  box-shadow: 0 12px 28px rgba(194, 130, 140, 0.25);
}

.nav-link.active {
  background: linear-gradient(135deg, #f8b7c7, #f6d4a5);
  color: #4c3240;
  box-shadow: 0 14px 32px rgba(201, 127, 135, 0.4);
}

.auth {
  display: flex;
  align-items: center;
  gap: 10px;
}

.welcome {
  font-size: 14px;
  color: var(--text-soft);
}

.auth-button {
  padding: 8px 14px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #f7c0ce, #f4ddb0);
  color: #4d3340;
  box-shadow: 0 12px 28px rgba(195, 132, 136, 0.5);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    filter 0.2s ease;
}

.auth-button:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
  box-shadow: 0 16px 40px rgba(189, 120, 134, 0.6);
}

.auth-button:active {
  transform: translateY(1px);
  box-shadow: 0 8px 18px rgba(165, 102, 114, 0.7);
}

.login-form {
  display: flex;
  align-items: center;
  gap: 8px;
}

.login-input {
  min-width: 120px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(236, 197, 199, 0.9);
  background: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.login-input::placeholder {
  color: rgba(151, 129, 137, 0.9);
}

.login-error {
  margin: 0;
  font-size: 12px;
  color: #b8485b;
}

.app-main {
  flex: 1;
  padding: 28px 10px 16px;
  display: flex;
  justify-content: center;
  align-items: stretch;
}

.panel {
  max-width: 880px;
  width: 100%;
}

.panel-inner {
  position: relative;
  padding: 38px 40px 36px;
  border-radius: 26px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  background:
    radial-gradient(circle at top left, rgba(255, 232, 245, 0.8), transparent),
    radial-gradient(circle at bottom right, rgba(219, 236, 255, 0.8), transparent),
    rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(20px);
}

.panel-kicker {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-soft);
  margin-bottom: 6px;
}

.panel-heading {
  font-family: var(--font-script);
  font-size: 42px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  color: var(--heading);
}

.panel-text {
  font-size: 17px;
  color: var(--text);
  margin-bottom: 18px;
}

.soft-note {
  font-size: 14px;
  color: var(--text-soft);
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin: 22px 0 10px;
}

.details-grid h2 {
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 4px;
}

.details-grid p {
  font-size: 15px;
  color: var(--text);
}

.app-footer {
  padding: 8px;
  text-align: center;
  font-size: 13px;
  color: var(--text-soft);
  text-shadow: 0 1px 3px rgba(255, 255, 255, 0.8);
}

@media (max-width: 900px) {
  .app-header {
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 12px;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .auth {
    width: 100%;
    justify-content: flex-end;
  }

  .login-form {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .panel-inner {
    padding: 26px 22px 24px;
  }

  .panel-heading {
    font-size: 32px;
  }

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