* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #16172a;
  --bg-card: #1e2038;
  --bg-elevated: #262848;
  --amber: #eab06e;
  --amber-light: #f0c88a;
  --amber-soft: #cc9450;
  --amber-glow: rgba(234, 176, 110, 0.2);
  --amber-glow-strong: rgba(234, 176, 110, 0.4);
  --text: #f0ece4;
  --text-secondary: #c8c0b4;
  --text-dim: #8a8498;
  --locked-bg: rgba(30, 30, 55, 0.6);
  --locked-border: rgba(100, 95, 120, 0.3);
  --radius: 14px;
  --radius-lg: 22px;
}

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  min-height: 100dvh;
  overflow-x: hidden;
}

#particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

#app {
  position: relative;
  z-index: 1;
  max-width: 440px;
  margin: 0 auto;
  padding: 20px 18px 40px;
}

/* ===== Header ===== */
header { text-align: center; padding: 28px 0 8px; }

.header-icon {
  font-size: 1.6rem;
  color: var(--amber);
  margin-bottom: 6px;
  text-shadow: 0 0 20px var(--amber-glow-strong);
}

header h1 {
  font-size: 1.55rem;
  font-weight: 300;
  color: var(--amber-light);
  letter-spacing: 2.5px;
  text-shadow: 0 0 30px var(--amber-glow);
}

.header-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 5px;
  letter-spacing: 1.5px;
  font-style: italic;
}

.progress-wrap { margin-top: 16px; }

.progress-bar {
  margin: 0 auto;
  width: 50%;
  height: 3px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--amber-soft), var(--amber));
  border-radius: 2px;
  transition: width 0.6s ease;
  box-shadow: 0 0 8px var(--amber-glow);
}

.progress-text {
  font-size: 0.66rem;
  color: var(--text-dim);
  margin-top: 5px;
  letter-spacing: 0.5px;
}

/* ===== Month Nav ===== */
.month-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 18px 0;
}

.nav-btn {
  background: none;
  border: 1px solid rgba(234,176,110,0.3);
  color: var(--amber);
  width: 34px; height: 34px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center;
}

.nav-btn:active { background: var(--amber); color: var(--bg); }
.nav-btn:disabled { opacity: 0.15; cursor: not-allowed; }

#month-label {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text);
  min-width: 130px;
  text-align: center;
  letter-spacing: 1px;
}

/* ===== Weekday ===== */
.weekday-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  padding-bottom: 10px;
}

.weekday-header span {
  font-size: 0.68rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===== Grid ===== */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 7px;
}

.day-cell {
  aspect-ratio: 1;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  user-select: none;
  border: 1.5px solid transparent;
  gap: 1px;
}

.day-cell.empty { cursor: default; }

.day-cell.locked {
  background: var(--locked-bg);
  border-color: var(--locked-border);
  color: var(--text-dim);
  cursor: not-allowed;
}

.day-cell .lock-icon { font-size: 0.5rem; opacity: 0.4; line-height: 1; }

.day-cell.locked.shake { animation: shake 0.35s ease; }

@keyframes shake {
  0%, 100% { transform: translateX(0) rotate(0); }
  25% { transform: translateX(-2px) rotate(-1deg); }
  75% { transform: translateX(1px) rotate(0.5deg); }
}

.day-cell.unread {
  background: var(--bg-elevated);
  border-color: rgba(234,176,110,0.5);
  color: var(--amber);
  animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 6px var(--amber-glow); }
  50% { box-shadow: 0 0 22px var(--amber-glow-strong), 0 0 6px var(--amber-glow); }
}

.day-cell .day-emoji { font-size: 0.8rem; line-height: 1; }

.day-cell.read {
  background: var(--bg-card);
  border-color: rgba(234,176,110,0.15);
  color: var(--text-secondary);
}

.day-cell.read .day-emoji { opacity: 0.45; }

.day-cell.today {
  border-color: var(--amber) !important;
  box-shadow: 0 3px 18px var(--amber-glow-strong);
}

.day-cell.today .day-num { color: var(--amber); font-weight: 600; }

.day-cell.no-content {
  background: var(--locked-bg);
  color: var(--text-dim);
  cursor: default;
  opacity: 0.3;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(8, 8, 18, 0.7);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 100;
  display: flex; align-items: center; justify-content: center;
  padding: 24px 18px;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.hidden { opacity: 0; pointer-events: none; }

.modal {
  background: linear-gradient(170deg, #262848 0%, #1c1e38 100%);
  border: 1px solid rgba(234,176,110,0.1);
  border-radius: var(--radius-lg);
  width: 100%; max-width: 380px; max-height: 80vh;
  overflow-y: auto;
  padding: 30px 24px 22px;
  position: relative;
  transform: translateY(0) scale(1);
  transition: transform 0.3s ease;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(234,176,110,0.04);
}

.modal-overlay.hidden .modal { transform: translateY(16px) scale(0.97); }

.modal-close {
  position: absolute; top: 12px; right: 16px;
  background: none; border: none; color: var(--text-dim);
  font-size: 1.3rem; cursor: pointer; padding: 4px 8px; z-index: 2;
}

.modal-header {
  display: flex; flex-direction: column; align-items: center;
  gap: 3px; margin-bottom: 18px;
}

.modal-emoji { font-size: 1.8rem; }
.modal-type { font-size: 0.65rem; color: var(--amber); letter-spacing: 2px; text-transform: uppercase; font-weight: 600; }
.modal-date { font-size: 0.72rem; color: var(--text-dim); }

.content-area { line-height: 2; font-size: 0.93rem; color: var(--text); }
.content-area.hidden { display: none; }

#content-reveal { animation: fadeUp 0.5s ease; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.content-text { white-space: pre-wrap; word-break: break-word; }
.content-song-title { font-weight: 600; color: var(--amber); font-size: 1rem; }
.content-song-artist { font-size: 0.78rem; color: var(--text-dim); margin-bottom: 12px; }

.modal-sign {
  text-align: right; margin-top: 20px;
  font-size: 0.82rem; color: var(--amber-soft);
  font-style: italic; opacity: 0.6; letter-spacing: 0.5px;
}

/* ===== Scratch ===== */
.scratch-container { position: relative; min-height: 180px; border-radius: var(--radius); overflow: hidden; }

#scratch-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 2; cursor: crosshair; border-radius: var(--radius);
}

.scratch-content { padding: 16px 8px; line-height: 2; }

.scratch-hint {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  z-index: 3; color: var(--text); font-size: 0.88rem; font-weight: 500;
  pointer-events: none; opacity: 0.9;
}

.scratch-hint.hidden { display: none; }

/* ===== Flip ===== */
.flip-container { perspective: 1000px; min-height: 220px; cursor: pointer; }

.flip-card {
  width: 100%; min-height: 220px; position: relative;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.4,0,0.2,1);
}

.flip-container.flipped .flip-card { transform: rotateY(180deg); }

.flip-front, .flip-back {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 24px;
}

.flip-front {
  background: linear-gradient(135deg, rgba(234,176,110,0.1) 0%, rgba(234,176,110,0.03) 100%);
  border: 1px solid rgba(234,176,110,0.2);
}

.flip-icon {
  font-size: 2.8rem; color: var(--amber); margin-bottom: 10px;
  animation: float 3s ease-in-out infinite;
  text-shadow: 0 0 24px var(--amber-glow-strong);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.flip-front p { font-size: 0.8rem; color: var(--text-dim); letter-spacing: 1.5px; font-style: italic; }

.flip-back {
  background: var(--bg-card);
  border: 1px solid rgba(234,176,110,0.1);
  transform: rotateY(180deg);
  line-height: 2; font-size: 0.93rem; color: var(--text);
  align-items: flex-start; justify-content: flex-start; overflow-y: auto;
}

/* ===== Legend ===== */
.legend {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px 14px; margin-top: 26px; padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.legend-item { font-size: 0.68rem; color: var(--text-dim); display: flex; align-items: center; gap: 3px; }
.legend-icon { font-size: 0.78rem; }

.modal::-webkit-scrollbar { width: 3px; }
.modal::-webkit-scrollbar-track { background: transparent; }
.modal::-webkit-scrollbar-thumb { background: var(--amber-soft); border-radius: 2px; }

@supports (padding-top: env(safe-area-inset-top)) {
  #app {
    padding-top: calc(20px + env(safe-area-inset-top));
    padding-bottom: calc(40px + env(safe-area-inset-bottom));
  }
}