* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background-color: white;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(50, 50, 93, 0.1), 0 5px 15px rgba(0, 0, 0, 0.07);
    width: 100%;
    max-width: 1000px;
    padding: 30px;
    overflow: hidden;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 2px solid #eaeaea;
    padding-bottom: 20px;
}
header h1 {
    color: #2d3436;
    margin-bottom: 10px;
}
header .subtitle {
    color: #636e72;
    font-size: 0.95em;
}

.control-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}
.control-panel h2 {
    color: #0984e3;
    flex-grow: 1;
    text-align: center;
}
.control-panel button {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background-color: #0984e3;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}
.control-panel button:hover {
    background-color: #0770c4;
    transform: translateY(-2px);
}
.control-panel .reset-btn {
    background-color: #e17055;
}
.control-panel .reset-btn:hover {
    background-color: #d63031;
}

.calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 12px;
    margin-bottom: 30px;
}
.weekday {
    text-align: center;
    font-weight: bold;
    color: #636e72;
    padding: 15px 5px;
    background-color: #f8f9fa;
    border-radius: 8px;
}
.day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: bold;
    position: relative;
    user-select: none;
}
.day:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.day .date-num {
    font-size: 1.5em;
    margin-bottom: 5px;
}
.day .status-text {
    font-size: 0.75em;
    opacity: 0.9;
}

/* 日期状态样式 */
.day.normal {
    background-color: #dfe6e9;
    color: #636e72;
}
.day.half {
    background-color: #ffeaa7;
    color: #e17055;
}
.day.full {
    background-color: #fab1a0;
    color: #d63031;
}
.day.other-month {
    background-color: #f8f9fa;
    color: #b2bec3;
    cursor: default;
}
.day.other-month:hover {
    transform: none;
    box-shadow: none;
}

.stats-panel {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 25px;
}
.stat-box, .legend {
    flex: 1;
    min-width: 250px;
}
.stat-box h3, .legend h3 {
    color: #2d3436;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px dashed #ddd;
}
.stat-box p {
    margin-bottom: 8px;
    color: #636e72;
}
.stat-box p span {
    font-weight: bold;
    color: #0984e3;
}
.hint {
    font-size: 0.85em;
    color: #b2bec3 !important;
    font-style: italic;
}
.legend-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}
.day-box {
    width: 25px;
    height: 25px;
    border-radius: 6px;
    margin-right: 12px;
    border: 2px solid rgba(255,255,255,0.7);
}
.day-box.normal { background-color: #dfe6e9; }
.day-box.half { background-color: #ffeaa7; }
.day-box.full { background-color: #fab1a0; }

footer {
    text-align: center;
    color: #636e72;
    font-size: 0.9em;
    border-top: 1px solid #eaeaea;
    padding-top: 20px;
}
footer button {
    margin: 10px;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    background-color: #00b894;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
footer button:hover {
    background-color: #00a085;
}
#export-data { background-color: #00b894; }
#import-data { background-color: #6c5ce7; }
#import-data:hover { background-color: #5b4fcf; }