:root{
  --bg: #0a0a1a;
  --surface: #13132a;
  --surface-raised: #1a1a35;
  --line: #2a2a50;
  --text: #ffffff;
  --muted: #8888aa;
  --purple: #9d4edd;
  --purple-dim: #2a1a45;
  --cyan: #00d9ff;
  --cyan-dim: #003a45;
  --green: #2ed573;
  --danger: #ff4757;
  --radius: 12px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

*{box-sizing:border-box; margin:0; padding:0;}

body{
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app{
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

/* HEADER */
.header{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  flex-wrap:wrap;
  gap:16px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
  margin-bottom: 28px;
}
.logo{
  font-family: var(--font-display);
  font-size: 30px;
  font-weight:700;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-shadow: 0 0 30px rgba(0,217,255,0.3);
}
.tagline{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-top: 4px;
}
.brand{
  font-size: 11px;
  color: var(--muted);
  margin-top: 3px;
  font-family: var(--font-mono);
}
.brand span{
  color: var(--purple);
  font-weight: 700;
}
.header-right{
  display:flex;
  align-items:center;
  gap: 14px;
}
.month-nav{
  display:flex;
  align-items:center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
}
.month-label{
  min-width: 130px;
  text-align:center;
  color: var(--cyan);
  font-weight: 700;
}
.nav-btn{
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text);
  width: 34px; height: 34px;
  border-radius: 8px;
  font-size: 18px;
  cursor:pointer;
  transition: all 0.2s;
}
.nav-btn:hover{
  background: var(--purple-dim);
  border-color: var(--purple);
  color: var(--purple);
}

.ghost-btn{
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 500;
  transition: all 0.2s;
}
.ghost-btn:hover{
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-dim);
}

.reset-btn{
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 600;
  transition: all 0.2s;
}
.reset-btn:hover{
  background: rgba(255,71,87,0.1);
  box-shadow: 0 0 15px rgba(255,71,87,0.3);
}

.primary-btn{
  background: var(--purple);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.2s;
  box-shadow: 0 0 20px rgba(157,78,221,0.3);
}
.primary-btn:hover{
  filter: brightness(1.15);
  box-shadow: 0 0 30px rgba(157,78,221,0.5);
}

/* STREAK STRIP */
.streak-strip{
  display:flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 32px;
}
.streak-card{
  flex: 0 0 auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 20px;
  min-width: 150px;
  transition: border-color 0.2s;
}
.streak-card:hover{ border-color: var(--purple); }
.streak-card .name{
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  font-family: var(--font-mono);
}
.streak-card .count{
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--cyan);
}
.streak-card .count .unit{
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
}

/* GRID SECTION */
.grid-section{ margin-bottom: 40px; }
.grid-toolbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom: 16px;
}
.grid-toolbar h2{
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.grid-wrapper{
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 0 40px rgba(157,78,221,0.08);
}
.habit-grid{
  border-collapse: collapse;
  width: 100%;
  font-family: var(--font-mono);
}
.habit-grid th, .habit-grid td{
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align:center;
  padding: 0;
}
.habit-grid th{
  background: var(--surface);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  padding: 10px 4px;
  position: sticky;
  top:0;
}
.habit-grid th.weekend{ color: var(--purple); }
.habit-grid th.today-col{
  color: var(--cyan);
  background: var(--surface-raised);
}

.habit-name-cell{
  text-align:left !important;
  padding: 10px 14px !important;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  background: var(--surface);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 8px;
  min-width: 160px;
}
.delete-habit{
  background:none;
  border:none;
  color: var(--muted);
  cursor:pointer;
  font-size: 14px;
  opacity: 0;
  transition: opacity .15s;
  padding: 2px 6px;
  border-radius: 4px;
}
.habit-name-cell:hover .delete-habit{ opacity: 1; }
.delete-habit:hover{
  color: var(--danger);
  background: rgba(255,71,87,0.1);
}

.day-cell{
  width: 34px;
  height: 40px;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}
.day-cell:hover{ background: rgba(157,78,221,0.08); }
.day-cell.today-col{ background: rgba(0,217,255,0.05); }

.stamp{
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--green);
  margin: auto;
  display:flex;
  align-items:center;
  justify-content:center;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  background: rgba(46,213,115,0.1);
  box-shadow: 0 0 8px rgba(46,213,115,0.3);
}
.stamp-placeholder{
  width: 24px; height: 24px;
  margin: auto;
  border-radius: 50%;
  border: 2px dashed transparent;
  transition: border-color 0.15s;
}
.day-cell:hover .stamp-placeholder{
  border-color: var(--line);
}

.empty-hint{
  color: var(--muted);
  font-size: 14px;
  margin-top: 16px;
  font-style: italic;
  text-align: center;
  padding: 20px;
}

/* DIARY */
.diary-section{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 0 40px rgba(0,217,255,0.05);
}
.diary-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom: 14px;
}
.diary-header h2{
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}
.date-input{
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color-scheme: dark;
  transition: border-color 0.2s;
}
.date-input:focus{ outline: none; border-color: var(--cyan); }
.diary-textarea{
  width: 100%;
  min-height: 160px;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 14px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.2s;
}
.diary-textarea::placeholder{ color: var(--muted); }
.diary-textarea:focus{ outline: none; border-color: var(--cyan); }
.diary-footer{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-top: 14px;
}
.diary-status{
  font-size: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* FOOTER */
.footer{
  margin-top: 40px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.footer span{
  color: var(--purple);
  font-weight: 700;
}

/* MODAL */
.modal-overlay{
  position: fixed; inset:0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  display:flex;
  align-items:center;
  justify-content:center;
  z-index: 50;
  padding: 20px;
}
.modal{
  background: var(--surface);
  border: 1px solid var(--purple);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 0 60px rgba(157,78,221,0.3);
}
.modal h3{
  font-family: var(--font-display);
  margin-bottom: 16px;
  font-size: 18px;
  color: var(--cyan);
}
.modal-input{
  width: 100%;
  background: var(--surface-raised);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  margin-bottom: 18px;
  transition: border-color 0.2s;
}
.modal-input::placeholder{ color: var(--muted); }
.modal-input:focus{ outline: none; border-color: var(--purple); }
.modal-actions{ display:flex; justify-content:flex-end; gap: 10px; }

/* SCROLLBAR */
::-webkit-scrollbar{ width: 6px; height: 6px; }
::-webkit-scrollbar-track{ background: var(--bg); }
::-webkit-scrollbar-thumb{ background: var(--line); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover{ background: var(--purple); }

/* RESPONSIVE */
@media (max-width: 640px){
  .header{ flex-direction:column; align-items:flex-start; }
  .day-cell, .habit-grid th{ width: 28px; }
  .habit-name-cell{ min-width: 120px; font-size: 13px; }
  .logo{ font-size: 24px; }
}

@media (prefers-reduced-motion: reduce){
  *{ transition: none !important; }
}

button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--purple);
  outline-offset: 2px;
}