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

body {
    font-family: Arial, sans-serif;
    background: #ffffff;
    color: #000000;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #ffffff;
}

.login-box {
    border: 2px solid #000000;
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    margin-bottom: 30px;
    font-size: 24px;
    text-align: center;
}

.warning-box {
    background: #ffffff;
    border: 2px solid #000000;
    padding: 15px;
    margin-bottom: 25px;
    font-size: 13px;
    line-height: 1.6;
    text-align: left;
}

.warning-box strong {
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #000000;
    background: #ffffff;
    color: #000000;
    font-size: 16px;
}

.form-group input:focus {
    outline: 2px solid #000000;
}

button[type="submit"] {
    width: 100%;
    padding: 12px;
    background: #000000;
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
}

button[type="submit"]:hover {
    background: #333333;
}

.error-message {
    background: #000000;
    color: #ffffff;
    padding: 10px;
    margin-bottom: 20px;
    text-align: center;
}

.header {
    background: #000000;
    color: #ffffff;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 20px;
}

.header-right {
    display: flex;
    gap: 10px;
    align-items: center;
}

.username {
    font-weight: bold;
    font-size: 14px;
}

.logout-btn {
    color: #ffffff;
    text-decoration: none;
    padding: 6px 12px;
    border: 1px solid #ffffff;
    font-size: 14px;
    white-space: nowrap;
}

.logout-btn:hover {
    background: #ffffff;
    color: #000000;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 10px;
}

.month-nav {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto auto;
    align-items: center;
    margin-bottom: 15px;
    padding: 15px;
    border: 2px solid #000000;
    gap: 10px;
}

.month-nav h2 {
    grid-column: 1 / -1;
    grid-row: 1;
    font-size: 22px;
    text-align: center;
    margin: 0;
    min-height: 30px;
}

#prevMonth {
    grid-column: 1;
    grid-row: 2;
    padding: 10px 5px;
    background: #000000;
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 13px;
    white-space: nowrap;
}

#nextMonth {
    grid-column: 2;
    grid-row: 2;
    padding: 10px 5px;
    background: #000000;
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 13px;
    white-space: nowrap;
}

.pdf-btn {
    grid-column: 3;
    grid-row: 2;
    padding: 10px 5px;
    background: #666666;
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 13px;
    white-space: nowrap;
}

.month-nav button:hover {
    background: #333333;
}

.tabs {
    display: flex;
    width: 100%;
    margin-bottom: 15px;
    border: 2px solid #000000;
}

.tab-btn {
    flex: 1;
    width: 33.333%;
    padding: 15px;
    background: #ffffff;
    color: #000000;
    border: none;
    border-right: 1px solid #000000;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
}

.tab-btn:last-child {
    border-right: none;
}

.tab-btn:hover {
    background: #f0f0f0;
}

.tab-btn.active {
    background: #000000;
    color: #ffffff;
}

.tab-content {
    min-height: 400px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: #000000;
    border: 2px solid #000000;
}

.day-header {
    background: #000000;
    color: #ffffff;
    padding: 8px 2px;
    text-align: center;
    font-weight: bold;
    font-size: 11px;
}

.day-cell {
    background: #ffffff;
    min-height: 70px;
    padding: 3px;
    cursor: pointer;
    position: relative;
}

.day-cell:hover {
    background: #f0f0f0;
}

.day-cell.empty {
    background: #e0e0e0;
    cursor: default;
}

.day-cell.empty:hover {
    background: #e0e0e0;
}

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

.day-cell.readonly:hover {
    background: #ffffff;
}

.day-number {
    font-weight: bold;
    margin-bottom: 2px;
    font-size: 10px;
}

.user-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-entry {
    background: #000000;
    color: #ffffff;
    padding: 2px 3px;
    font-size: 8px;
    display: inline-block;
    width: fit-content;
    line-height: 1.2;
}

.user-entry.own-entry {
    background: #000000;
    color: #ffffff;
    font-weight: bold;
}

.user-entry-plain {
    color: #000000;
    padding: 2px 3px;
    font-size: 8px;
    display: inline-block;
    width: fit-content;
    line-height: 1.2;
}

@media (min-width: 768px) {
    .header h1 {
        font-size: 24px;
    }
    
    .header-right {
        gap: 20px;
    }
    
    .container {
        padding: 20px;
    }
    
    .month-nav {
        grid-template-columns: 140px 1fr 140px 180px;
        grid-template-rows: 1fr;
        padding: 20px;
        margin-bottom: 30px;
        gap: 20px;
    }
    
    .month-nav h2 {
        grid-column: 2;
        grid-row: 1;
        font-size: 26px;
        min-width: 300px;
        max-width: 400px;
        justify-self: center;
    }
    
    #prevMonth {
        grid-column: 1;
        grid-row: 1;
        width: 140px;
        padding: 12px 10px;
        font-size: 15px;
    }
    
    #nextMonth {
        grid-column: 3;
        grid-row: 1;
        width: 140px;
        padding: 12px 10px;
        font-size: 15px;
    }
    
    .pdf-btn {
        grid-column: 4;
        grid-row: 1;
        width: 180px;
        padding: 12px 10px;
        font-size: 15px;
    }
    
    .tab-content {
        min-height: 600px;
    }
    
    .day-header {
        padding: 10px;
        font-size: 14px;
    }
    
    .day-cell {
        min-height: 100px;
        padding: 5px;
    }
    
    .day-number {
        font-size: 14px;
        margin-bottom: 5px;
    }
    
    .user-entry {
        padding: 3px 6px;
        font-size: 12px;
        line-height: 1.4;
    }
    
    .user-entry-plain {
        padding: 3px 6px;
        font-size: 12px;
        line-height: 1.4;
    }
    
    .user-list {
        gap: 3px;
    }
}