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

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

body {
    font-family: 'Inter', 'Arial', sans-serif;
    background: linear-gradient(135deg, #e0eafc 0%, #cfdef3 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
}

.calendar-container {
    background: rgba(255,255,255,0.95);
    padding: 1.5rem 0.5rem 1rem 0.5rem;
    border-radius: 18px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    width: 100vw;
    max-width: 100vw;
    height: 100vh;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
    border: 1.5px solid #e3e3e3;
    backdrop-filter: blur(2px);
}

h1 {
    text-align: center;
    color: #2e3a59;
    margin: 0.5rem 0 1rem 0;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 0 2px 8px #e0eafc;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(21, 1fr);
    grid-auto-rows: 32px;
    gap: 4px;
    flex: 1;
    overflow-x: auto;
    padding: 0.5rem 0.25rem 0.25rem 0.25rem;
    background: rgba(240,245,255,0.7);
    border-radius: 12px;
    box-shadow: 0 2px 8px 0 rgba(31, 38, 135, 0.07);
}

.day-cell {
    border: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: box-shadow 0.18s, background 0.18s, transform 0.12s;
    position: relative;
    background: #fff;
    font-size: 0.85rem;
    min-height: 32px;
    min-width: 18px;
    height: 100%;
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 1px 2px 0 rgba(31, 38, 135, 0.04);
    will-change: transform;
}

.day-cell:hover {
    background: #f0f7ff;
    box-shadow: 0 2px 8px 0 rgba(31, 38, 135, 0.10);
    transform: scale(1.07);
    z-index: 2;
}

.day-cell:active {
    background: #e3f2fd;
    transform: scale(0.97);
}

.day-cell.checked {
    background: #e8f5e9;
    box-shadow: 0 2px 8px 0 rgba(76, 175, 80, 0.10);
    animation: pop 0.18s;
}

@keyframes pop {
    0% { transform: scale(1); }
    60% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.week-complete {
    background: #b2f7cc !important;
    box-shadow: 0 2px 12px 0 rgba(76, 175, 80, 0.10) !important;
}

.week-complete:hover {
    background: #a3e9c3 !important;
}

.month-complete {
    background: #43a047 !important;
    color: #fff;
    box-shadow: 0 2px 16px 0 rgba(56, 142, 60, 0.15) !important;
}

.month-complete .day-number {
    color: #fff !important;
    text-shadow: 0 1px 2px #388e3c;
}

.month-complete:hover {
    background: #388e3c !important;
}

.day-number {
    font-size: 0.85rem;
    color: #2e3a59;
    margin-bottom: 0;
    line-height: 1;
    font-weight: 600;
    text-align: center;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 2px #e0eafc;
}

.checkbox {
    width: 16px;
    height: 16px;
    margin: 2px auto 0 auto;
    display: block;
    cursor: pointer;
    accent-color: #43a047;
    transition: box-shadow 0.15s;
    box-shadow: 0 1px 2px 0 rgba(31, 38, 135, 0.04);
    border-radius: 4px;
}

.checkbox:active {
    box-shadow: 0 0 0 2px #43a04733;
}

.counter {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: #388e3c;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.message {
    text-align: center;
    font-size: 1.1rem;
    font-weight: 500;
    color: #1976d2;
    margin-bottom: 0.5rem;
    min-height: 1.5em;
    transition: color 0.3s, font-size 0.3s;
}

/* Responsive : tablette */
@media (max-width: 1100px) {
  .calendar-grid {
    grid-template-columns: repeat(14, 1fr);
    grid-auto-rows: 28px;
    gap: 3px;
    overflow-x: auto;
  }
  .calendar-container {
    padding: 0.5rem 0.1rem 0.5rem 0.1rem;
    width: 100vw;
    max-width: 100vw;
  }
  .day-cell {
    font-size: 0.75rem;
    min-height: 28px;
    border-radius: 6px;
  }
  .checkbox {
    width: 14px;
    height: 14px;
  }
  h1 {
    font-size: 1.3rem;
  }
}

@media (max-width: 700px) {
  .calendar-grid {
    grid-template-columns: repeat(7, 1fr);
    grid-auto-rows: 24px;
    gap: 2px;
    padding: 0.2rem;
    overflow-x: auto;
  }
  .calendar-container {
    padding: 0.2rem 0.05rem 0.2rem 0.05rem;
    width: 100vw;
    max-width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
  }
  h1, .counter, .message {
    font-size: 1rem;
    margin: 0.2rem 0 0.5rem 0;
    text-align: center;
    white-space: normal;
    word-break: break-word;
    padding-left: 8px;
    padding-right: 8px;
    width: 100%;
    box-sizing: border-box;
  }
  .counter, .message {
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
  }
  .day-cell {
    font-size: 0.75rem;
    min-height: 24px;
    border-radius: 4px;
  }
  .checkbox {
    width: 12px;
    height: 12px;
  }
}