/* ===== Rain Page · 印象城市 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: rgba(235, 228, 255, 0.92);
  --ink-soft: rgba(210, 200, 245, 0.6);
  --gold: rgba(232, 200, 120, 0.85);
  --glass: rgba(20, 18, 42, 0.42);
  --glass-border: rgba(200, 190, 255, 0.18);
  --font-serif: "Noto Serif SC", serif;
  --font-sans: "Noto Sans SC", sans-serif;
  --font-mono: "Space Mono", monospace;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: #0c0a1c;
  font-family: var(--font-sans);
  color: var(--ink);
}

#rainCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
}

/* ===== Top bar ===== */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 26px;
  pointer-events: none;
}
.topbar a, .topbar .page-title, .topbar .date-stamp { pointer-events: auto; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 1px;
  padding: 6px 12px;
  border-radius: 20px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}
.back-link:hover {
  color: var(--gold);
  border-color: var(--gold);
  transform: translateX(-3px);
}

.page-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.date-stamp {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}

/* ===== Stage / note card ===== */
.stage {
  position: relative;
  z-index: 5;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 90px 24px 80px;
  pointer-events: none;
}

.note-card {
  pointer-events: auto;
  width: min(560px, 92vw);
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255,255,255,0.08);
  overflow: hidden;
}

.note-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--glass-border);
}
.note-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 10px var(--gold);
}
.note-label {
  flex: 1;
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 1px;
}
.note-new {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--ink-soft);
  font-size: 16px;
  cursor: pointer;
  transition: all 0.25s ease;
}
.note-new:hover {
  color: var(--gold);
  border-color: var(--gold);
  transform: rotate(90deg);
}

.note-area {
  flex: 1;
  min-height: 280px;
  resize: none;
  border: none;
  outline: none;
  background: transparent;
  padding: 22px 24px;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink);
  letter-spacing: 0.5px;
}
.note-area::placeholder {
  color: var(--ink-soft);
  font-style: italic;
}

.note-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border-top: 1px solid var(--glass-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}
.note-count { letter-spacing: 1px; }

/* ===== Control toggle button ===== */
.ctrl-toggle {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  width: 52px; height: 52px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  transition: all 0.3s ease;
}
.ctrl-toggle:hover {
  color: var(--gold);
  border-color: var(--gold);
  transform: rotate(45deg) scale(1.05);
}

/* ===== Control panel ===== */
.control-panel {
  position: fixed;
  right: 24px;
  bottom: 88px;
  z-index: 19;
  width: 280px;
  padding: 18px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(16px) saturate(120%);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  transform: translateY(20px) scale(0.95);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.control-panel.open {
  transform: translateY(0) scale(1);
  opacity: 1;
  visibility: visible;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--ink);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.panel-close {
  width: 24px; height: 24px;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}
.panel-close:hover { color: var(--gold); }

.panel-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.panel-row.col { flex-direction: column; align-items: stretch; gap: 8px; }
.panel-row label {
  width: 64px;
  flex-shrink: 0;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 1px;
}
.panel-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  border-radius: 3px;
  background: rgba(200, 190, 255, 0.2);
  outline: none;
  cursor: pointer;
}
.panel-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 8px var(--gold);
  cursor: pointer;
}
.panel-row input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  border: none;
  border-radius: 50%;
  background: var(--gold);
  cursor: pointer;
}
.panel-val {
  width: 38px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}

.panel-divider {
  height: 1px;
  background: var(--glass-border);
  margin: 14px 0;
}

.bg-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.bg-opt {
  padding: 8px 6px;
  border: 1px solid var(--glass-border);
  background: transparent;
  border-radius: 8px;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  white-space: nowrap;
}
.bg-opt.active {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(232, 200, 120, 0.08);
}

.noise-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--glass-border);
  background: transparent;
  border-radius: 18px;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.25s ease;
}
.noise-toggle.on {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(232, 200, 120, 0.08);
}

.panel-tip {
  margin-top: 6px;
  font-size: 11px;
  line-height: 1.7;
  color: var(--ink-soft);
  font-style: italic;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .page-title { display: none; }
  .control-panel { right: 12px; left: 12px; width: auto; bottom: 84px; }
  .ctrl-toggle { right: 16px; bottom: 16px; }
  .note-area { font-size: 15px; min-height: 220px; }
}